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MINUTES - 09182001 - C.8
CY TO: BOARD OF SUPERVISORS "0 FROM: MAURICE M. SHIU, CHIEF ENGINEER DATE: September 18, 2001 SUBJECT: . ADOPT the previously certified City of Brentwood Mitigated Negative Declaration for the Sand Creek Road Extension Project for the purpose of completing real property transactions in compliance with the California Environmental Quality Act, Brentwood area. Project No. 7589-6D8301 Specific Request(s) or Recommendation(s) & Background & Justification I. RECOMMENDED ACTION: ADOPT the previously certified City of Brentwood Mitigated Negative Declaration for the Sand Creek Road Extension Project for the purpose of completing real property transactions in compliance with the California Environmental Quality Act, (the custodian of which is the Public Works Director who is located at 255 Glacier Drive, Martinez), and DIRECT the Director of Community Development to file a Notice of Determination, and AUTHORIZE the Chief Engineer to arrange for payment of a $25 fee to Community Development for processing, and a $25 fee to the County Clerk for filing the Notice of.Detenriination. Cont'sued on Attachment: x SIGNATURE: ECOMMENDATION OF COUNTY ADMINISTRATOR - - i(ECOMNIENDATION OF BOARD COMMITTEE 1'EE .APPROVE _OTHER t SIGNATURE(S): ACTION OF BO DON September 18 , 2001 APPROVED AS RECOMMENDED OTHER VOTE OF SUPERVISORS I hereby certify that this is a true and correct XX— UNANIMOUS(ABSENT ) AYES: NOES: copy of an action taken and entered on the ABSENT: ABSTAIN: minutes of the Board of Supervisors oil the date shown. TT:sd G:\GrpData\EngSvc\ENVIRO\2001 projects\Board Orders\ Sand Creek Rd-Adopt(09-I8-01).doc Orig.Div: Public Works(Eng Sery Division) ATTESTED: September 18 , 2001 Contact: Leigh Chavez, Phone(925)313-2366 cc: County Administrator JOHN SWEETEN, Clerk of the Board of Attn: E. Kuevor Supervisors and County Administrator Auditor-Controller Community Development—K. Piona PW Accounting Flood Control-R. Levin By , Real Property Deputy Environmental-T.Torres SUBJECT: ADOPT the previously certified City of Brentwood Mitigated Negative Declaration for the Sand Creek Road Extension Project for the purpose of completing real property transactions in compliance with the California Enviromnental Quality Act, Brentwood area. Project No. 7589-6D8301 DATE: September 18, 2001 PAGE: 2 II. FINANCIAL IMPACT: There is no financial impact. III. REASONS FOR RECOMMENDATION/BACKGROUND: In April of 2000, the City of Brentwood published the Sand Creek Road Extension .Project Mitigated Negative Declaration. The Brentwood City Council adopted the Mitigated Negative Declaration on May 23, 2000. The Contra Costa County Board of Supervisors is adopting the City of Brentwood's Mitigated Negative Declaration to address the necessary Flood Control District real property transactions associated with the project. Contra Costa County Flood Control and Water Conservation District wishes to exchange right-of.--way it currently owns on Sand Creek Road with an equivalent area of right-of-way held by the City of Brentwood in the Sand Creek Channel. The areas are each approximately 0.3 acres in size and are located west of the intersection of Sand Creek Road and Fairview Avenue. In addition, Contra Costa County Flood Control and Water Conservation District wishes to quitclaim to the City of Brentwood portions of Sand Creek and old Sand Creek Road, which include approximately 0.3 acres on the west side of Fairview Avenue and approximately 0.3 acres on the east side of Fairview Avenue. The District reserves flowage and access easements on this area. IV. CONSEQUENCES OF NEGATIVE ACTION: Delay in adopting the negative declaration will prevent the necessary property transfers. 0 un -'0 00 0 0� n ) ° o ) -10 00 r o° 0 a C) -10 let U) Z o 0 (� 2- t z no 0AN 0 *O 01997 Thomas Bros. 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Project Title: Sand Creek Road Extension, CIP Project No. 336-3061 State Clearinghouse Number: N/A Contact Person: Stephanie Gronlund, Associate Engineer Area Code/Number/Extension: (925) 516-5420 Project Location: Central portion of Brentwood, Contra Costa County, State of California, between Sand Creek/O'Hara loop roadway and Fairview Avenue Project Description: Proposed construction of 4-lane arterial roadway with crossings of Marsh Creek, Sand Creek and U.P.R.R. tracks. This is to advise that the City of Brentwood approved the above-described project on May 23, 2000, and has made the following determinations regarding the above-described project: 1. The project will not have a significant effect on the environment. 2. A Negative Declaration was prepared for this project pursuant to the provisions of CEQA. 3. Mitigation measures were made a condition of the approval of the project. 4. A statement of Overriding Considerations was not adopted for this project. 5. Findings were made pursuant to the provisions of CEQA for this project. This is to certify that the Negative Declaration with comments and responses and record of project approval is available to the General Public at: City Hall, Engineering Department-708 Third Stteet, Brentwood, California 94513. L'�,ZK�' Ci ee Si ature (Public Age cv) i FE� Date: JUN 6 2000 S.L. WEIR, COUNTY CLERK CONTRA COSTA COUNTY BY `� DEPUTY r ' t Initial Study/ Mitigated Negative Declaration Project City of Brentwood Sand Creek Road Extension Lead Agency: City of Brentwood April, 2000 1 y t Table of Contents Introduction........................................................................................ 2 Applicant/Contact Person........................................................................ 2 Project Location and Context ................................................................... 2 Project Description ......................................... Environmental Factors Potentially Affected .................................................. 9 Determination ..................................................................................... 9 Evaluation of Environmental Impacts.......................................................... 10 EarlierAnalyses....................................................................................20 Attachment to Initial Study...................................................................... 22 1. Aesthetics ........................................................................ 22 I1. Agricultural Resources......................................................... 23 I11. Air Quality....................................................................... 23 IV. Biological Resources ........................................................... 25 V. Cultural Resources.............................................................. 36 VI. Geology and Soils .............................................................. 37 VII. Hazards and Hazardous Materials ............................................ 39 VIII. Hydrology and Water Quality................................................. 40 IX. Land Use and Planning......................................................... 42 X. Mineral Resources ... ......................................................... 45 XI. Noise.............................................................................. 45 XII. Population and Housing........................................................ 50 XIII. Public Services .................................................................. 50 XIV. Recreation ....................................................................... 51 XV. Transportation/Traffic.......................................................... 52 XVI. Utilities and Service Systems ................................................. 55 XV. Mandatory Findings of Significance ........................................ 56 Initial Study Preparers............................................................................ 58 Aaencies and Organizations Consulted........................................................ 58 References ......................................................................................... 58 T City of Brentwood Environmental Checklist/ Initial Study Introduction This Initial Study has been prepared in accord with the provisions of the California Environmental Quality Act (CEQA) and assesses the potential environmental impacts of implementing. the proposed project described below. The Initial Study consists of a completed environmental checklist and a brief explanation of the environmental topics addressed in the checklist. Applicant/Contact Person City of Brentwood Engineering Department 708 Third Street Brentwood CA 94613 Attention: Stephanie Gronlund, P.E, Associate Civil Engineer Project Location and Context The project site is located within central Brentwood. located in eastern Contra Costa County. A portion of the project area presently lies in unincorporated Contra Costa County within the sphere of influence of the City of Brentwood. The Sand Creek Road extension would be generally located between the State Route (SR) 4 Bypass (now under construction) on the west to Brentwood Boulevard on the east. More specifically. the west end of the road would begin at Linden Avenue west of Fairview Avenue (currently a temporary roadway, to be demolished when final roadway improvements are built as part of this project) and extend in an east-west direction through central Brentwood. Sand Creek Road would then terminate at the newly constructed Sand Creek Road/O'Hara Loop roadway immediately west of Brentwood Boulevard. The project would also consist of extending O'Hara Avenue to the intersection of Sand Creek Road/O'Hara Avenue. This intersection would be built at its ultimate width and would be designed as a one-way controlled intersection with four travel lanes and necessary turning lanes. Exhibit I shows the regional setting of Brentwood and Exhibit 2 shows the local context of the proposed project. Project Description The City of Brentwood proposes to construct a new portion of Sand Creek Road that would1be located as described in the previous section. City of Brentwood Page 2 Initial Study/Sand Creek Road Extension April 2000 1 Proposed road improvements to be accomplished in the initial phase of construction would consist of two travel lanes in an east-west direction within an approximate right-of-way width of 140 feet. Exhibit 3 shows the approximate location of the future road. Construction of the roadway would require the acquisition of right-of-way from abutting properties, clearing of land; grading for the creek and railroad crossings, excavation of the roadbed and construction of road improvements. Road improvements in the initial phase are anticipated to consist of the two inside travel lanes and a median in the middle of the road. New traffic signal systems would be installed at the Fairview Avenue/Sand Creek Road intersection and at the O'Hara Avenue/Sand Creek Road intersection. Underground utilities to be constructed within the right-of-way would include sewer, water, non-potable water and storm drain lines as well as a conduit for a future fiber optic line. Street lights would be installed approximately every 250 feet. Two additional travel lanes would be added in each direction at some point in the future, based on future traffic volumes, although the segment from the SR 4 Bypass to Fairview Avenue is planned to accommodate six travel lanes at ultimate build out. The second phase of construction would also include construction of curbs, gutters, sidewalks and landscaping within the public right-of-way. Construction of the roadway would require the crossing of both Marsh Creek and Sand Creek. It is anticipated that the crossing of Sand Creek would be via an extension of the existing box culvert over the creek. Crossing of Marsh Creek would either be by installation of box culverts or a bridge. An at-grade crossing of the Union Pacific Railroad tracks west of Marsh Creek would also be part of the project. The project would also include features to facilitate construction of pedestrian trails in the central portion of Brentwood. Specifically, a pedestrian undercrossing would be constructed east of Fairview Avenue to allow construction of a future north-south recreational trail as part of the City's trail system. Immediately west of the proposed crossing of the Union Pacific Railroad tracks a pedestrian undercrossing would be built as part of a future north-south trail. The proposed crossing of Marsh Creek would be designed to accommodate the existing East Bay Regional Parks District recreational trail on the south side of Marsh Creek. The proposed roadway extension would include construction of new facilities to accommodate anticipated increased levels of stormwater runoff. These improvements would consist of a new storm drain inlet into Sand Creek near the existing box culvert located at the intersection of Sand Creek Road and Fairview Avenue. A second new storm drain inlet would be constructed into Marsh Creek at the proposed Marsh Creek crossing. Both facilities are anticipated to have a diameter of 36 inches, although the final size would be determined based on further engineering studies. The approximate location of the new storm drain inlets are shown on Exhibit 4. The proposed crossing of the Union Pacific railroad tracks would also require the installation of culverts or underground pipes to accommodate existing drainage swales at the base of either side of the tracks. This extension of Sand Creek Road is included as a major east-west arterial roadway in the Transportation Element of the Brentwood General Plan. Construction of the initial phase of improvements is anticipated in mid-2000. City of Brentwood Page 3 Initial Study/Sand Creek Road Extension April 2000 The project is also proposed to include minor improvements to existing roads in the vicinity of the Sand Creek Road project, as follows: • Minor widening of the west side of Minnesota Avenue from north of Spinnaker Ridge subdivision to Sand Creek Road, eliminating a jog in the right-of-way line. A new curb line would also be constructed along the west side of Minnesota Avenue. • Minor widening of Fairview Avenue, north and south of the proposed Sand Creek Road right-of-way to facilitate turning movements. Widenings would include approximately 10 feet on the east side of Fairview Avenue (north and south of the proposed intersection of Fairview and proposed intersection with Sand Creek Road and approximately 25 feet along the west side of Fairview north of the proposed intersection with Sand Creek Road. City of Brentwood Page 4 Initial Study/Sand Creek Road Extension April 2000 O 7 _ m i Sand r R �d cu LL ■ Proposed Sand Creek Road a Alignment m a —i Gec•�a Exhibit 3 N CITY OF BRENTWOOD PRELIMINARY SAND CREEK ROAD EXTENSION ROADWAY ALIGNMENT NEGATIVE DECLARATION .I 1. Project description: Proposed construction of Sand Creek Road between the existing eastern terminus east of Fairview Road to link with existing Sand Creek Road/O'Hara Avenue Loop near Brentwood Boulevard. The project involves one crossing each of Marsh Creek and Sand Creek, a crossing of the Union Pacific railroad tracks and two new storm water outfalls: one into Marsh Creek and one into Sand Creek. Minor road improvements to adjacent roads would also be constructed. 2. Lead agency: City of Brentwood Engineering Department 708 Third Street y Brentwood CA 94613 3. Contact person: Stephanie Gronlund, Associate Civil Engineer (925) 516 5420 4. Project location: Central portion of Brentwood 5. Project sponsor: City of Brentwood 6. General Plan designation: Varies. primarily Low Density Residential 7. Zoning: Varies, primarily R I (Single Family Residential) 8. Other public agency required approvals: • Permits from Contra Costa County Flood Control District • Encroachment Permit from East Bay Regional Parks District • Streambed Alteration Permits from California Department of Fish and Game • Approvals from California Public Utilities Commission for crossing. of Union Pacific Railroad tracks • Approvals from Regional Water Quality Control Board • Permits from the U.S. Army Corps of Engineers. City of Brentwood Page 8 Initial Study/Sand Creek Road Extension April 2000 Environmental Factors Potentially Affected The environmental factors checked below would be potentially affected by this project, involving at least one impact that is a "potentially significant impact" as indicated by the checklist on the following pages. X Aesthetics - Agricultural X Air Quality Resources X i Biological Resources X Cultural Resources X Geology/Soils X Hazards and X Hydrology/Water - Land Use/ Planning Hazardous Materials Quality - Mineral Resources X Noise - Population/Housing � y I i X Public Services X Recreation X ' Transportation/ Circulation X ' Utilities/Service ; - Mandatory Findings Systems ; of Significance Determination (to be completed by Lead Agency): On the basis of this initial evaluation: I find that the proposed project could not have a significant effect on the environment and a Negative Declaration will be prepared. X I find that although the proposed project could have a significant effect on the environment, there will not be a significant effect in this case because the mitigation measures described on an attached sheet have been added to the project. A Negative Declaration will be prepared. I find that although the proposed project may have a significant effect on the environment. but at least one effect 1 ) has been adequately analyzed in an earlier document pursuant to applicable legal standards, and 2) has been addressed by mitigation measures based on earlier analysis as described on the attached sheets, if the effect is a "potentially significant impact" or "potentially significant unless tnitigate.d." An Environmental Impact Report is required, but must only analyze the effects that remain to be addressed. I find that although the proposed project could have a significant effect on the environment. there will not be a significant effect in this case because all potentially significant effects (a) have been analyzed adequately in an earlier EIR pursuant to applicable standards, and (b) have been avoided or mitigated pursuant to that earlier EIR, including revisions or mitigation measures that are imposed on the proposed project. \: 4 S w Si,,nature: Date: Printed Name: For: -�� City of Brentwood Page 9 Initial Study/Sand Creek Road Extension April 2000 ♦ 1 Sol; u Davis B0i Sacramento Vacaville Napa Petaluma Fairfield boli � `J Vallejo Novato San Martinez a,. mod afael Coord Antioch �s nc Richmond (4`' Stockton Be-keiey Walnu; 4 z4, Creek BRENTWOOD Oakland aso; �a San as Francisco 205 San Tracy Leandro ` Livermore s.A.•,V::.'. Hayward :...�F4 tiC.I S C G. 1 Pleasanton n ... SanI Mate Fremont Hall 5. Moon Q Bay Palo o Alto 0 ce. zeo Sunnyvale San Jose Santa Clara v (ior• C Exhibit 1 REGIONAL LOCATION N CITY OF BRENTWOOD SAND CREEK ROAD EXTENSION 0 s ro rs 20 miles NEGATIVE DECLARATION .. ............................. City of Oakley t 7� .. . .. City of Antioch I . ........::.................._:..............._._ f —. � .. J. _..._...__._... .._..._:moi- . _ -- B R E N T W 0 ID ` I . .:.:. ...:.. : - .......... . .:. ............ .....:.. :..:...:.: .................. - - - ...... .......... I ;� Detail Area shown in —:--el' Exhibits 3-7 Exhibit 2 LOCAL CONTEXT I I —•—•— Brentwood City Limit I I Proposed Sand Creek Road N CITY OF BRENTWOOD SAND CREEK ROAD EXTENSION ° "` "z 3% NEGATIVE DECLARATION Evaluation of Environmental Impacts 1) A brief explanation is required for all answers except "no impact" answers that are adequately supported by the information sources a lead agency cites in the parenthesis following each question. A "no impact" answer is adequately supported if the referenced information sources show that the impact simply does not apply to projects like the one involved (e.g. the project falls outside a fault rupture zone). A "no impact" answer should be explained where it is based on project-specific factors as well as general factors (e.g. the project will not expose sensitive receptors to pollutants, based on a project-specific screening analysis). 2) All answers must take account of the whole action, including off-site as well as on-site. cumulative as well as project-level, indirect as well as direct, and construction as well as operational impacts. 3) "Potentially Significant Impact" is appropriate if there is substantial evidence that an effect is significant. If there are one or more "potentially significant impact" entries when the determination is made, an EIR is required. 4) "Negative Declaration: Less Than Significant With Mitigation Incorporated" implies elsewhere the incorporation of mitigation measures has reduced an effect from "potentially significant effect" to a "less than significant impact." The lead agency must describe the mitigation measures and briefly explain how they reduce. the effect to a less than significant level. J. City of Brentwood Page 10 Initial Study/Sand Creek Road Extension April 2000 Environmental Impacts (Note: Source of determination listed in parenthesis. See listinc, . of sources used to determine each potential impact at the end of the checklist) Note: A full discussion of each item is found Potentially Less Than Less than I No following the checklist. Significant Significant Significant I Impact I Impact With Impact Mitigation I. Aesthetics. Would the project.- a) roject.a) Have a substantial adverse impact on a scenic X I i vista? (Source: 3) b) Substantially damage scenic resources, including but not limited to trees, rock X outcroppings, and historic buildings within a state scenic highway? (Source: 2, 3) ' C.) Substantially degrade the existing visual i character or quality of the site and its X surroundings? (Source: 2, 3) i d) Create a new source of substantial light or ' I glare which would adversely affect day or X ! nighttime views in the area? (Source: 3) I 11. Agricultural Resources i til/ould the project: a) Convert Prime Farmland, Unique Farmland or I Farmland of Statewide Importance, as showing on the maps prepared pursuant to I X the Farmland Mapping and Monitoring Program of the California Resources Agency, to a non-agricultural use? (Source: b) Conflict with existing zoning for agriculture use, or a Williamson Act contract? (Source: X I . 2 3) c) Involve other changes in the existing environment which, due to their location or X nature, could result in conversion of farmland to a non-agricultural use? (Source: I 111. Air Quality (Where available, the significance criteria established by the applicable air quality management district may be relied on to make the following I determinations). Would the project.- a) roject.a) Conflict with or obstruct implernentation of X the applicable air quality plan? (Source: 2 ) b) Violate any air quality standard or contribute substantially to an existing or projected air quality violation? (Source: 2) j City of Brentwood Page 11 Initial Study/Sand Creek Road Extension April 2000 Potentially Less Than Less than � No Significant Significant Significant Impact Impact With Impact Mitieation i c) Result in a cumulatively considerable net increase of any criteria pollutant for which i the project region is non-attainment under an X i I applicable federal or state ambient air ! quality standard (including releasing emissions which exceed quantitative 1 thresholds for ozone precursors? (Source:2) ! d) Expose sensitive receptors to substantial i . X pollutant concentrations? (Source:3 ) ; e) Create objectionable odors? (Source:3 ) I X i 1V. Biological Resources. Would the project a) Have a substantial adverse effect, either directly through habitat modifications, on i X ! any species identified as a candidate, sensitive, or special status species in local or I i regional plans, policies or regulations, or by the California Department of Fish and Game or the U.S. Fish and Wildlife Service? I i (SourceA ! b) Have a substantial adverse effect on any riparian habitat or other sensitive natural ! community identified in local or regional X plans, policies or regulations or by the ! California Department of Fish and Game or the U.S. Fish and Wildlife Service? (Source: 4) i c) Have a substantial adverse impact on federally protected wetlands as defined by I X Section 404 of the Clean Water Act i I (including but not limited to marsh, vernal I I i I Pool, coastal, etc.) through direct removal. j ! filling, hydrological interruption or other- means. I ! (Source: 4) d) Interfere substantially with the movement of any native resident or migratory fish or wildlife species or with established native X resident or migratory wildlife corridors, or impede the use of native wildlife nursery sites? (Source: 4) I e) Conflict with any local policies or ordinances j I X protecting biological resources, such as tree protection ordinances? (Source: 4) City of Brentwood Page 12 Initial Study/Sand Creek Road Extension April 2000 Potentialiv Less Than Less than No I Significan-t Significant I Significant I Impact Impact With Impact Mitiration f) Conflict with the provision of an adopted I i Habitat Conservation Plan, Natural I Community Conservation Plan or other X approved local, regional or state habitat conservation plan? (Source: 4) _ V. Cultural Resources. Would the project a) Cause a substantial adverse impact in the significance of a historical resource as i I X defined in Sec. 15064.5? (Source: 2) I i b) Cause a substantial adverse change in the significance of an archeological resource X pursuant to Sec. 15064.5 (Source:2 ) t c) Directly or indirectly destroy a unique paleontological resource or unique geologic I X j feature? (Source: 2) y j d) Disturb any human remains, including those interred outside of a formal cemetery' I X (Source: 2) I I I VI. Geology and Soils. Would the project a) Expose people or structures to potential substantial adverse effects, including the risk of loss, injury, or death involving: y � I i) Rupture of a known earthquake fault, as ! ' delineated on the most recent Alquist-Priolo Fault Zoning Map issued by the State X I Geologist or based on other known evidence of a known fault (Source:2) ii) Strong seismic ground shaking (2) I X Seismic-related ground failure, including liquefaction? (Source: 2) I X X iv) Landslides? (Source.: 2, 3) ! i X b) Result in substantial soil erosion or the loss of i j X topsoil? (Source: 2, 3) I _ c) Be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project and potentially result in X on- and off-site landslide, lateral spreading, subsidence, liquefaction or collapse (Source: I I 1. 2J d) Be located on expansive soil, as defined in I Table 13-1-B of the Uniform Building Code (1994), creating substantial risks to life or X property? (Source: 2) City of Brentwood Page 13 Initial Study/Sand Creek Road Extension April 2000 Potential)>> Less Than Less than No Significant Significant Significant Impact Impact With Impact Mitwation ! e) Have soils capable of adequately supporting r X the use of septic tanks or alternative wastewater disposal systems where sewers are not available for the disposal of waste? (Source: 2) VII. Hazards and Hazardous Materials. Would j the project: a) Create a significant hazard to the public or the environment through the routine transport. use or disposal of hazardous materials X (Source: 2) b) Create a significant hazard to the public or the environment through reasonably foreseeable upset and accident conditions involving the X release of hazardous into the environment? (SOUrce:2 ) _ c) Emit hazardous emissions or handle i hazardous materials, substances, or waste within one-quarter mile of an existing or X proposed school? (Source: 2, 3) d) Be located on a site which is included on a list of hazardous materials sites complied pursuant to Government Code Sec. 65962.5 X and, as a result, would it create a significant hazard to the public or the environment? (Source: 2) e) For a project located within an airport land use plan or, where such plan has not been adopted, would the project result in a safety X hazard for people residing or working in the project area*-' (Source: 2, 3) f) For a project within the vicinity of private airstrip, would the project result in a safety ! X hazard for people residing or working in the project area? (Source: 2, 3) g) Impair implementation of or physically interfere with the adopted emergency X response plan or emergency evacuation plan? i (Source: 2. 3) City of Brentwood Page 14 Initial Study/Sand Creek Road Extension April 2000 Potentially Less Than Less than No SivnificantSignificant Significant Impact j Impact With Impact Mitigation , h) Expose people or structures to a significant risk of loss, injury or death involving wildland fires, including where wildlands X '! are adjacent to urbanized areas or where residences are intermixed with wildlands? (Source: 2, 3) IX. Hydrology and Water Quality. Would the project: a) Violate any water quality standards or waste discharge requirements? (Source: 2, 7) X i b) Substantially deplete groundwater supplies or interfere substantially with groundwater- recharge such that there would be a net I deficit in aquifer volume or a lowering of the I local groundwater table level (e.g. the ! X production rate of existing nearby wells would drop to a level which would not support existing land uses or planned uses j for which permits have been granted? j (Source: 2) c) Substantially alter the existing drainage pattern of the site or area, including through the aeration of the course of a stream or y i X i ! river, in a manner which would result in substantial erosion or siltation on- or off- s te? ff-site? (Source: 2, 7) d) Substantially alter the existing drainage pattern of the site or areas, including through j the alteration of a course or stream or river, X or Substantially increase the rate or amount ol'Surface runoff in a manner which would j result in flooding on- or off-site? (Source: e) Create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or X i provide substantial additional sources of polluted runoff? (Source: 2, 3) f) Otherwise substantially degrade water X { quality? (Source: 2, 8) a) Place housing within a 100-year flood hazard i area as mapped on a Flood Hazard Boundary j X or Flood Insurance Rate Map or other flood j delineation map? (Source:7) i ! City of Brentwood Page 15 Initial Study/Sand Creek Road Extension April 2000 Prnentially Less Than ! Less than No Si nifie int SignificantSignificant impact j Impact ! With Impact Miti-atiOm ! h) Place within a 100-year flood hazard area I --�- structures which impede or redirect flood X flows? (Source:7) i) Expose people or structures to a significant risk of loss, injury, and death involving X flooding, including flooding as a result of the failure of a levee or dam? (Source:7) -------------------------- j) Inundation by seiche, tsunami or mudflow? I X IX. Land Use and Planning. Would the project: a) Physically divide an established community? X (Source: 1, 2, 3) b) Conflict with any applicable land use plan, policy. or regulation of an agency with I I Jurisdiction over the project (including. but I X not limited to the general plan, specific plan, local coastal plan, or zoninG ordinance) adopted for the purpose of avoiding or mitigating an environmental effect? (Source: 1, 2) c) Conflict with any applicable habitat i conservation plan or natural 1, 2) _ _ I -. I X X. Mineral Resources. Would the project _ a) Result in the loss of availability of a known I i mineral resource that would be of value to i X the region and the residents of the state. (Source:2 ) I b) Result in the loss of availability of a locally I important mineral resource recovery site X delineated on a local General Plan, specific plan or other land use plan`? (Source: 2) Xi. Noise. li•ould the proposal result in: I a) Exposure of persons to or generation of noise levels in excess of standards established in the general plan or noise ordinance, or X applicable standards of other agencies'? (Source: 5) b) Exposure of persons or to generation of i X excessive groundborne vibration or groundborne noise levels? (Source: 5) c) A substantial permanent increase to ambient +, noise levels in the project vicinity above I X existing* levels without the project? (Source: 5) L -— City of Brentwood Page 16 Initial Study/Sand Creek Road Extension April 2000 I Potentially Less Than Less than No Significant Significant Significant Impact Impact With I Impact Mitigation � d) A substantial temporary or periodic increase ; I in ambient noise levels in the project vicinity X above levels without the project? (Source: 5) e) For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport X or public use airport, would the project expose people residing or working n the project area to excessive noise levels ? I I (Source: 2) f) For a project within the vicinity of a private airstrip, would the project expose people i X residing or working in the project area to excessive noise levels? (Source: 2) XII. Population and Housing. Would the project a) Induce Substantial population growth in an area, either directly or indirectly (for i X example, through extension of roads or other infrastructure)? (Source: 2) b) Displace substantial numbers of existing ! housing, necessitating the construction of ! I X replacement housing elsewhere? (Source: 3) c) Displace substantial numbers of people, i necessitating the replacement of housinG X elsewhere? (Source: 2, 3) XIII. Public Services. Would the proposal: a) Would the project result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, the construction of i which could cause significant environmental impacts, in order to maintain acceptable service rations, response times or other ! performance objectives for any of the public services? (Source: 2, 7) Fire protection? _ _ X Police protection X Schools X Parks X Other public facilities ! ; X City of Brentwood Page 17 Initial Study/Sand Creek Road Extension April 2000 Potentially Less Than Less than No Significant Significant ' Significant Impact Impact With Impact _ Miti_ation j XIV. Recreation: a) Would the project increase the use of existing neighborhood or regional facilities such that X substantial physical deterioration of the facility would occur or be accelerated I l (Source: 3) I b) Does the project include recreational facilities I or require the construction or expansion of- I X I recreational facilities which might have an adverse physical effect on the environment? I (Source: 3. 7) i XV. Transportation and Traffic. Would the � project: a) Cause an increase in traffic which is I substantial in relation to the existing traffic I load and capacity of the street system (i.e. . � X � result in a substantial increase in either the j number of vehicle trips, the volume to capacity ratio on roads or congestion at intersections)? (Source:6) b) Exceed, either individually or cumulatively, a level of service standard established by the X County Congestion Management Agency for designated roads or highways? (Source:6) c) Result in a change in air traffic patterns, I -- - including either an increase in traffic levels i or a change in location that results itl X substantial safety risks? (Source:2, 6 ) d) Substantially increase hazards due to a dcslatl feature (c.g. sharp curves or dangerous y X intersections) or incompatible uses, such as farm equipment`' (Source.-7) e) Result in inadequate emergency access? (2) :. X 0 Result in inadequate parking capacity? (2) I I X g) Conflict with adopted policies, plans or programs supporting alternative transportation X (such as bus turnouts and bicycle facilities) (2). City of Brentwood Page 18 Initial Study/Sand Creek Road Extension April 2000 Potentially I Less Than Less than No Significant I Significant I Significant Impact Impact With Impact _ 1 Miti<_<ation XVI. Utilities and Service Systems. 6Vould the � i project j a) Exceed wastewater treatment requirements of the applicable Regional Water Quality X Control Board? (Source:7) b) Require or result in the construction of new � water or wastewater treatment facilities or ! expansion of existing facilities, the X construction of which could cause significant environmental effects? (7) c) Require or result in the construction of new I storm water drainage facilities or expansion j Of existing facilities, the construction of X which could cause significant environmental effects? (Source:7) d) Have sufficient water supplies available to .serve the project frorn e.xistina. water i X entitlements and resources, or are new or expanded entitlements needed? (7) e) Result in a determination by the wastewater treatment provider which serves or may serve the project that it has adequate I I j X capacity to serve the project's projected I demand in addition to the providers existing commitments? (Source:7) y f) Be served by a landfill with sufficient permitted capacity to accommodate the F ! i X project's solid waste disposal needs?(7) i 2► Comply with federal, state and local statutes " X and regulations related to solid waste"(7) XNT Mandatory Findings of Significance. a) Does the project have the potential to degrade ! I the quality of the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to '; X drop below self-sustaining levels, threaten to eliminate a plant or animal community, reduce the number of or restrict the range of a rare or endangered plant or animal or i eliminate important examples of the major i periods of California history or prehistory? City of Brentwood Page 19 Initial Study/Sand Creek Road Extension April 2000 Potentially Less Than Less than No i Sienificant i Significant ' Significant Impact Impact with I Impact i Mitigation b) Does the project have impacts that are individually limited, but cumulatively considerable? ("Cumulatively considerable" means that the incremental effects of a I X project are considerable when viewed in connection with the effects of past projects. the effects of other current projects and the i effects of probable future projects). c) Does the project have environmental effects which will cause substantial adverse effects X on human beings, either directly or indirectly? SOUrCCS used to determine potential environmental impacts 1. General Plan 2. General Plan EIR 3. Site visit 4. Biological Resources Analysis prepared by James Martin 5. Acoustic Impact Report prepared by Charles Salter Associates 6. Traffic analysis prepared by George Nickelson 7. Discussion with City of Brentwood staff 8 Other source Earlier Analyses Earlier analyses may be used where, pursuant to the tiering, program EIR, or other CEQA process, one or more effects have been adequately analyzed in an earlier EIR or negative declaration. Reference Section 15063 (c)(3)(dl. a) Earlier analyses used. Identify earlier analyses and state where they are available for review. Portions of the environmental setting, project impacts and mitigation measures for this Initial Study refer to environmental information contained in the 1993 General Plan Environmental Impact Report (EIR). Copies of this documents is available for public review at the City of Brentwood Planning Department. b) Impacts adequately addressed. Identify which effects from the above checklist were within the scope of and adequately analyzed in an earlier document pursuant to applicable le0al standards, and state whether such effects were addressed by mitigation measures based on an earlier analysis. These have been described in the above checklist and/or the accompanying checklist description. City of Brentwood Page 20 Initial Study/Sand Creek Road Extension April 2000 c) Mitigation measures. For effects that are "less than significant with mitigation incorporated," describe the mitigation measures which are incorporated or refined from the earlier document and the extent to which they address site specific conditions for the project. City of Brentwood Page 21 .Initial Study/Sand Creek Road Extension April 2000 Attachment to Initial Studv Discussion of Checklist Legend PS: Potentially Significant LPS/M: Less Than Significant After Mitigation LS: Less Than Significant Impact NI: No Impact I. Aesthetics Environmental Setting Sand Creek Road Extension Sand Creek Road extension site is generally flat and contains no significant geologic features, such as rock outcroppings, stands of major trees or similar features. Two significant aesthetic features include Marsh Creek which traverses the easterly portion of the study area and Sand Creek, which is found on the westerly boundary of the proposed roadway extension. Properties adjoining the proposed roadway alignment are planned for low density residential development by the City of Brentwood and two subdivisions are currently under construction adjacent to the proposed roadway right-of-way. In general, the proposed roadway right-of-way is vacant with the properties used for grazing or field crops for a number of years. There are no local or state designated scenic highways near the project site. Project Impacts and Mitigation Measures a.c) Have a substantial adverse on a scenic vista? LS. Construction of the project would involve constructing at-grade roadway improvements along a majority of the right-of-way. Portions of the proposed road would be elevated above the existing grade level and could be viewed by motorists using the new road. motorists on nearby roads. users of.nearby recreational trails and residents and visitors of nearby residences. The proposed pedestrian overcrossing near Fairview Road is anticipated to extend approximately 6 feet above emstina grade and the proposed bridge over Marsh Creek may extend as high as 10 feet above existing grade to accommodate. the proposed pedestrian undercrossing for the existing Marsh Creek trail. In addiiton, the extension of Sand Creek Road would be elevated in the vicinity of the Union Pacific Railroad tracks to accommodate the at-grade crossing of the tracks. Although these portions of the roadway would be visible from adjacent sites, views of the proposed roadway is not anticipated to be adverse and a less- than-significant impact would result regarding adverse impacts to scenic vistas. b) Substant[alls'damage scenic resources, including state scenic highrvar? NI. No major scenic resource is located on the sites, so no damage would be caused to such a resource. No local or state designated scenic highways are located on or adjacent to the sites. Therefore, no impact would result. City of Brentwood Page 22 Initial Study/Sand Creek Road Extension April 2000 i I I d) Create light or glare? LS/M. The Sand Creek Road extension could have a negative aesthetic impact on residential dwellings. existing and future, through the "spill over" of unwanted street lighting. This could be a sign fic.ant impact. The following mitigation is therefore recommended to reduce spillover of lighting impacts to a level of less-than- significant: Mitigation Measure 1: Pole-mounted street lights shall be equipped with cut-off lenses and oriented down toward interior streets to minimize unwanted light and glare spill over. 111. Agricultural Resources Environmental Setting The soils underlying the proposed Sand Creek Road extension has been classed as a Class 2 Prime Agricultural Soils (General Plan EIR, Figure 10). Figure 1 1 of the General Plan EIR notes that site soils are "prime farmland." Much of the land through which the road extension is proposed has been recently used for dry land farming or cattle grazing. According to the General Plan EIR, there are no Williamson Act Land Conservation agreements on properties that would be affected by the road extension. Project Impacts and Mitigation Measures a-c.) Convert Prime Farmland, conflict with agricultural 7011illg or convert prince j`armland to a iron-agricultural use? LS. Construction of the proposed roadway would convert vacant, prime agricultural lands to a public roadway. Although this would normally be a potentially significant impact, a Statement of Overriding Considerations (City of Brentwood Resolution No. 93-53) was adopted as part of the General Plan EIR certification, with loss of prime agricultural soils specifically listed as an impact that cannot be feasibly mitigated. Therefore, loss of agricultural soils and resources would be considered a less-thair- sigiiificant impact and no further analysis of this impact is required. III. Air Quality Environmental Setting The project area is located on the southern shore of the San Joaquin River delta, east of the Carquinez Strait. This geographic portion of Contra Costa County is typified by winds flowing through the Carquinez Strait and into the Delta. Air quality emissions within Contra Costa County is regulated on the federal level by the Environmental Protection Agency (EPA), on the state level by the California Air Resources Board (CARB) and on a regional and local level by the Bay Area Air Quality Management District (BAAQMD). Federal and state air emission standards have been established for the following substances: carbon monoxide, ozone, particulate matter (PM-10), nitrogen dioxide. sulfur dioxide and lead. City of Brentwood Page 23 Initial Study/Sand Creek Road Extension April 2000 The BAAQMD maintains monitoring stations at Concord, Pittsburg and Bethel Island within Contra Costa County. As indicated in the General Plan EIR. there were minimal exceedances of" State and federal air quality standards through 1990 for ozone and carbon monoxide. Project Impacts and Mitigation Measures a) Would the project conflict or obstruct implementation of an air qualitY plan? NI. The proposed road extension would not conflict with the local Clean Air Plan adopted by the Bay Area Air Quality Management District to improve air quality in the basin. Therefore. no impacts would result. b) Would the project violate anv air yualitY standards? LS/M. Short-term construction impacts related to the proposed project, including grading, excavation and related construction activities, could result in exceedances of air quality standards established by the Bay Area Air Quality Management District. This would be a potentially- significant impact due to releases of wind-borne fugitive dust. Mitigation Measure 2, below. is recommended to ensure that short term a.radina and related construction activities comply with air quality standards and will reduce any such impacts to a level of less-than- significant. Mitigation Measure 2: The following measures shall be adhered to during all construction phases of the roadway construction project: • As part of the grading plan and grading operations, the project contractor shall ensure that the site is watered prior to commencement of grading and that watering occur on a sufficiently frequent basis to control dust; • Paving of'roads should occur as soon as possible after grading of the site; • Revegetation of graded sites should occur as soon as possible after grading: • Stockpiled earthen material shall be either covered with a tarp or watered v frequently; • Trucks hauling earthen material shall be covered: • A compliance officer, responsible for implementation and monitoring. shall be identified as part of the grading permit process. c) I-t%i.0►ld the project result in cumulativelY considerable air pollutants? LS. The proposed Sand Creek Road extension would facilitate additional traffic within the Brentwood Plannrno Area (See Section XV. Transportation ), however, the amount of traffic to be added to the local roadway system and the associated amounts of air ernissions have been anticipated in the Brentwood General Plan and the impacts analyzed in the General Plan EIR. The General Plan EIR found that long-term regional air pollutant emissions would be significant and full mitigation of this impact are not considered feasible. A Statement of Overriding Considerations (City of Brentwood Resolution No. 93-53) identified air quality impact as a remaining significant impact. Therefore, based on this previous action, cumulative air quality impacts would be less-than-significant and no further analysis is required. d.e) Eypose sensitive receptors to significant pollutant concentrations or create objectio►iuble odors? NJ. The proposed project would not include residential dwellings so that no impacts would occur. City of Brentwood Page 24 Initial Study/Sand Creek Road Extension April 2000 IV. Biological Resources Em-1ronmental Se -it tlrig, [Note: The following section has been prepared by James Martin, a field biologist, based on a site investigation conducted on July 12, 1999.] Biological resources along the proposed Sand Creek Road Extension project alignment were identified through a review of past background information and detailed surveys and a field reconnaissance survey. Available documentation was reviewed to provide information on general resource in the area, presence of sensitive natural communities, and the distribution and habitat requirements of special-status species which have been recorded from or are suspected to occur in the site vicinity. A field reconnaissance survey was conducted by James Martin, principal of Environmental Collaborative, on 12 July 1999 to determine the vegetation and wildlife resources, extent of sensitive natural communities, potential for jurisdictional wetlands. and habitat suitability for special-status species. The following provides a summary of the biological and wetland resources along the proposed alignment, and an assessment of the significance of potential impacts of project implementation. Vegetation and wildlife The proposed alignment site consists of primarily open fields historically used for agriculture and/or grazing. The area is transitioning to residential uses, and the fallow fields are being replaced with residences, roadways, and landscaping. The proposed alignment would cross the Marsh Creek and Sand Creek channels, and both of these creeks support a narrow band of freshwater marsh vegetation along the channel bottom. Riparian vegetation is absent along both these creeks in the vicinity of the proposed alignment due to routine maintenance of the channels by the Contra Costa County Flood Control District. Vegetative cover along the proposed alignment was either absent at the time of the July 1999 reconnaissance as a result of discina and grading, or consisted of a cover of non-native grasses and ruderal (weedy) species. The western half of the site, from the edge of the Sand Creek channel to the berm along the Union Pacific railroad right-of-way was devoid of vegetation. Non-native arassland occurs on the slopes of the railroad right-of-way and the pastureland to the cast. Irrigation runoff in man-made drainage ditches along either side of the railroad right-of-way support a narrow band of emergent vegetation. On the west side of the right-of-way, this consists of a one-foot wide band of nut sedge (Cyperus echinatus). On the east side of the right-of-way the drainage is less defined. approximately five feet in width and composed of cattail (Tvpho sp.). saltgrass (DI'sticlisspicata) curly dock (Rume.v crispus). and tobacco tree (Nicotiana glauca). The creek corridors support a cover of non-native grassland on the channel banks and freshwater marsh species on the channel bottom. Non-native grasses and ruderal species on the channel banks include: wild oat (Avena,fatua), perennial ryegrass (Lolirun perenne), bindweed (Convolvulus arvensis), and yellow star thistle (Centaurea solstitialis). Both creek segments along the proposed alignment have been recontoured as part of flood control improvements, eliminating any riparian vegetation, shrubs, and trees along the banks. The channel bottoms support rapidly colonizing species such as cattail, saltgrass and curly dock. Wildlife observed along the proposed alignment are typical of agricultural and suburban habitats. The ahsence of any vegetative cover over most of the site and on-going disturbance limits the City of Brentwood Page 25 Initial Study/Sand Creek Road Extension April 2000 habitat suitability for wildlife. Common species in the vicinity include: black-tailed jackrabbit. California ground squirrel, Bottae pocket gopher, scrub jay, mourning dove, American crow, European starling, American kestrel, red-tailed hawk and turkey vulture. No important nesting or dcnning activitj, was observed on or in the immediate vicinity of the proposed alignment. The absence of well-developed freshwater marsh and riparian cover along the creek segments limits their value to wildlife. No amphibians or aquatic species were observed during the July 1999 reconnaissance, although the creek channels most likely function as movement corridors for a number of species. At least one species of swallow was observed nesting in the concrete box culvert at the Fairview Road crossing over Sand Creek. More than 40 mud nests were found attached to the vertical wall of the culvert, with numerous adults and evidence of young in the nests. Due to the proximity of perennial flows from Sand Creek and the abundance of,insect prey, the box culvert provides ideal nesting habitat for barn swallow (Hirundo rustica), cliff swallow (Hit-undo pyrrhonota) and violet green swallow (Tachycineta thalassina). Special-Status Species Special-status species' are plants and animals that are legally protected under the state and/or federal Endangered Species Acts'or other regulations, as well as other species that are considered rareenough by the scientific community and trustee agencies to warrant special consideration, particularly with regard to protection of isolated populations, nesting or denning locations, communal roosts and other essential habitat. Species with legal protection under the Endangered Species Acts often represent major constraints to development, particularly when they are wide ranging or highly sensitive to habitat disturbance and where proposed development would result in a "take"' of these species. Past and on-going disturbance associated with flood control improvements along the creek channels, and grading and disking of uplands has eliminated the potential for occurrence of any Special-status species include: designated rare, threatened, or endangered and candidate species for listing by the California Department of Fish and Game (CDFG); designated threatened or endangered and candidate species for listing by the U.S. Fish and Wildlife Service (USFWS); species considered rare or endangered under the conditions of Section 15380 of the California Environmental Quality Act Guidelines, such as those plant species identified on lists 1A, 1 B and 2 in the Inventory of Rare and Endangered Vascular Plants of California by the California Native Plant Society (CNPS); and possibly other species which are considered sensitive or of special concern due to limited distribution or lack of adequate information to permit listing or rejection for state or federal status, such as those included on list 3 in the CNPS Inventory or identified as animal "Species of Special Concern" by the CDFG. - The federal Endangered Species Act (FESA) of 1973 declares that all federal departments and agencies shall utilize their authority to conserve endangered and threatened plant and animal species. The California Endangered Species Act (CESA) of 1984 parallels the policies of FESA and pertains to native California species. "Take" as defined by the FESA means "to harass, harm, pursue, hunt, shoot, wound, kill, trap. capture or collect" a threatened or endangered species. "Harm" is further defined by the USFWS to include the killing or harming of wildlife due to significant obstruction of essential behavior patterns (i.e., breeding, feeding, or sheltering) through significant habitat modification or degradation. The CDFG also considers the loss of listed species habitat as take, although this policy lacks statutory authority and case law support under the CESA. City of Brentwood Page 26 Initial Study"Sand Creek Road Extension April 2000 special-status plant species along the proposed alignment. All of the plant species encountered du►-ing the July 11999 field reconnaissance were non-native, and much of the ground surface was stripped of vegetation. A number of special-status animal species are known from the Brentwood vicinity and northeast Contra Costa County. These species are listed in Table 1, and include: California tiger salamander, western pond turtle, California red-legged frog, tricolored blackbird, golden eagle, burrowing owl, ferrugineous hawk, northern harrier, yellow warbler, white-tailed kite, California horned lark, merlin, prairie falcon, peregrine falcon, loggerhead shrike, American badger, and San Joaquin kit, among others. Information on each of these species is discussed below, together with conclusions on their potential for occurrence along the proposed alignment. California Red-Legged Frog. This frog is listed as a threatened species by the USFWS, and is known from the Marsh Creek drainage upstream from Marsh Creek Reservoir, about five miles to the southwest. This species requires still or slow-moving water during the breeding season. where it deposits large egg masses. usually attached to submerged or emergent vegetation. Red- legged frogs are capable of dispersing long distances from aquatic habitat, and may utilize ephemeral water sources during the wet season. They may take refuge in small mammal burrows, beneath leaf litter or in other moist areas during periods of inactivity or whenever necessary to avoid desiccation. Habitat along the proposed alignment is largely unsuitable for California red-legged frog. The channel segments lack riparian vegetation and well-developed freshwater marsh which are important as protective cover, and the creeks most likely support populations of predatory species such as bull frog, centrarchid fish species, and crayfish, which are all known to feed on e,ygs and larvae of other amphibians such as red-legged frog. Peak flood flows in the creeks most likely flush any amphibians from the channels during the winter months. Protocol surveys conducted for the 114 acre Spa-L Project site which encompassed a large portion of the proposed alignment on the west side of the railroad right-of-way did not find any evidence of red-legged frog (Monk & Associates, 1998), and the USFWS concluded that no take is likely to occur (USFWS, 1998). The SPA L Project was to include a new outfall structure in the Marsh Creek channel to drain surface runoff from future development. and the surveys extended along the affected segment of Marsh Creek. California Tiger Salamander. The distribution of California tiger salamander has declined due to conversion of valley and foothill grassland habitat to agricultural and urban uses (Stebbins. 1980. Adult salamanders occupy burrows made by California ground squirrel and other rodents for much of the year, and migrate to water sources to breed after the first hard rains in the fall. This subspecies breeds in temporary pools and permanent water, usually associated with grassland and open woodlands, where the water- source lasts at least through late spring to permit development of larval young. Suitable breeding pools are absent along the proposed alignment, and the presence of predatory species in Sand and Marsh creeks most likely precludes use of the channel segments in the project vicinity for breeding. City of Brentwood Page 27 Initial Study/Sand Creek Road Extension April 2000 Table 1 Special-Status Animal Species Potential Occurrence in Project Vicinity Status Habitat Characteristics Taxa Name Federal/State AMPHIBIANS/REPTILES Ambvstonia tigrint+m californiense C/CSC Grassland and open woodlands with temporary or permanent water California tiger salamander Clenim'vs marnrorata */CSC Ponds, marshes. rivers, and streams Western pond turtle Rana aurora dravtoni FT/CSC Permanent ponds, pools, and streams California red-legged frog BIRDS Age !trios tiicolr�r */CSC Waterways and adjacent grassland and agricultural fields Tricolored blackbird Aquila c.•hrvsaetos -/CSC. CP Open mountains. foothills, and canyons Golden eagle Athene cunicularia -/CSC Open grassland and fields, farms. and ruderal areas v Burrowing owl Buteo regalis */CSC Forages in variety of habitats, but not known to breed in Ferruginous hawk California Circus cuneus y -/CSC Marshes, fields, and grassland Northern harrier Dendroico petechia breivsteri -/- Dense willow and riparian woodlands Yellow warbler Elanus caeruleus -/CP Open foothills, marshes, and grassland White-tailed kite Eremophda alpestris actin */CSC Open habitat with sparse cover California horned lark Falco cnhunbaricurs -/CSC Forages in variety of habitats, but not known to breed in Merlin California Falco nrexicanus -/CSC: Canyons, mountains, open grassland Prairie falcon Falco peregrincus FE/SE. CP Canyons, mountains, open grassland Peregrine falcon Lanius hich.-vicianus */CSC Open habitat with scattered trees, shrubs, and other perches Loggerhead shrike MAMMALS 7'axidea taxcus -/CSC Grassland, oak savanna, and woodland American badder Vulpes macroti;r nuctica FE/ST Alkali sink, saltbrush scrub. grassland. and A oak savanna San Joaquin kith fox City of Brentwood Page 28 Initial Study/Sand Creek Road Extension April 2000 i I i Status Designations i Ferlei-ul: FE =Listed as Endangered under the federal Endangered Species Act. FT =Listed as Threatened under the federal Endangered Species Act. PE =Proposed for federal listing as "endangered". PT =Proposed for federal listing as "threatened". C =A candidate species under review for federal listing. Candidates includes taxa for which the USFWS has sufficient biological information to support a proposal to list as endangered or threatened. * =These species were considered to be category 2 candidate taxa for federal listing until 28 February 1996 when the USFWS revised their status classification system. These species no longer have any candidate designation, but are unofficially classified as species of concern and could be added to the candidate list if information demonstrates they warrant listing. Stine: SE =Listed as Endangered under the California Endangered Species Act. ST =Listed as Threatened under the California Endangered Species Act. CP =California fully protected species; individual may not be possessed or taken at any time. CSC =Considered a species of special concern by the California Department of Fish and Game; taxa have no formal legal protection but nest sites and communal roosts are generally recognized as significant biotic features. I I I City of Brentwood Page 29 Initial Study/Sand Creek Road Extension April 2000 I Western Pond Turtle. This species occurs in permanent freshwater ponds, lakes, marshes and creeks �k here baskin- and retreat habitat is present. The pond turtle is aquatic, but basks along_ shorelines and partially submerged logs or rocks; and has been known to lay its eggs in grassland habitat up to 0.5 miles from a permanent water source. Both Marsh and Sand creeks provide suitable dispersal corridors for this species, although deep pools necessary for retreat are absent along the segments where the proposed alignment would cross the channels. San Joaquin Kit Fox. It appears that kit fox historically inhabited most of the alkali sink community of the San Joaquin Valley and adjacent valley systems (Morrell, 1972, 1975). Kit fox also occupied the lower reaches of many of the surrounding foothill grasslands, extending into western San Joaquin and eastern Contra Costa and Alameda counties. However, intensive agricultural development, livestock grazing and ground squirrel eradication through the use of poison, have greatly reduced the extent of suitable habitat for this subspecies during the past half century. Other,factors that may affect kit fox populations include illegal shooting and trapping., road kills. lack of adequate denning sites and interspecific competition with and predation by coyote and red fox. Currently, kit fox occur in the remaining alkali scrub and grassland habitat, with sporadic occurrences in savanna, woodland, and suitable agricultural habitat. Eastern Contra Costa County currently represents the northern-most extent of the known range of'the San Joaquin kit fox. The proposed alignment is just outside the range for kit fox according; to mapping by Morrell in 1975. The closest reported kit fox sightings are from the Black Diamond Mines Regional Preserve about seven miles to the west, the Walnut Boulevard/Camino Diablo intersection about six miles to the south, and south of Byron about eight miles to the southeast. No recent sightings of kit fox have been made from the north Brentwood vicinity, and the USFWS recently concluded that no take of kit fox was likely to occur for SPA-L Project site encompassing a large portion of the proposed alignment (USFWS, 1998). American Bad-er. This large mammal occurs in grassland and savanna habitat with abundant prey. Badgers excavate burrows for denning, and to extract ground squirrels, gophers and other prey. This species has declined or been eliminated from large areas of the state due to agricultural and urban development, and has been designated a Species of Special Concern by the CDFG. Due to the extent of development in the project vicinity, the proposed alignment is no longer believed to provide suitable habitat for this species. No evidence of any badger diaginas were observed during the July 1999 field reconnaissance. Burrowing, Owl. This owl has no legal status under the federal or state Endangered Species Acts. but is protected under the provisions of the. Migratory Bird Treaty Act' and is recognized as a Species of Special Concern by the CDFG, like many of the raptors known to occur in the Brentwood vicinity. Destruction of California ground squirrel colonies, conversion of pastureland to agricultural and urban development, poisoning and human disturbance have been the rnajor reasons for the decline of this species. Suitable nesting habitat occurs in ground squirrel colonies along the railroad right-of-way and along the creek channels, however no evidence of any nesting activity was observed during the July 1999 field reconnaissance. There is a possibility that owls could establish nests in the vicinity of proposed improvements in the future. A. The Migratory Bird Treaty Act does not provide protection for habitat of migratory birds, but does prohibit the destruction or possession of individual birds, eggs, or nests in active use without a permit from the USFWS. City of Brentwood Page 30 Initial Study/Sand Creek Road Extension April 2000 Other Bird Species of Concern. Suitable foraging and possibly breeding habitat for several other- bird species of concern occurs in the Brentwood vicinity, including: golden eagle, northern harrier, yellow warbler, white-tailed kite, ferruginous hawk, merlin, prairie falcon, loggerhead shrike, horned lark, and tricolored blackbird. Most of these have been identified as Species of' Special Concern by the CDFG, but have no legal protective status under the state or federal Endangered Species Acts. Active nests of raptors, including red-tailed hawk. are protected under the Migratory Bird Treaty Act and Section 3503.5 of the State Fish and Game Code. Due to the extent of development and lack of cover over most of the proposed alignment, the site is not considered essential habitat for any of the other bird species of concern. Other then the swallow nests observed in the box culvert under Fairview Road. no evidence of any nesting activity was observed during the July 1999 field reconnaissance. Suitable nesting habitat for tricolored blackbird is absent along the segments of the creek channels where crossings are proposed. Similarly, areas of dense riparian scrub required for nesting by yellow warble is also absent. The remaining grasslands may provide occasional foraging habitat for loggerhead shrike. horned lark, and raptor species of concern, but essential nesting habitat is absent due to the extent of past development an on-going disturbance.. Several other- special-status species are known from northeast Contra Costa, but are not suspected to occur along the proposed alignment due to a complete absence of suitable habitat or essential features such as potential.roost and nest sites. These include invertebrate species of' concern and roost habitat for Townsend's western big-eared bat (Corynorhinus townsendii townsendii), pallid bat (Antrozous pallidus), western mastiff bat (Eumops perotis), and other bat species of concern. v ellan,-ls Although definitions vary to some degree, wetlands are generally considered to be areas that are periodically or permanently inundated by surface or ground water, and support vegetation adapted to life in saturated soil. Wetlands are recognized as important features on a regional and national level due to their high inherent value to fish and wildlife, use as storage areas for storm and flood waters, and water recharge, filtration and purification functions. The CDFG. U.S. Army Corps of Engineers (Corps) and California Regional Water- Quality Control Board have Jurisdiction over modifications to wetlands and other "waters of the United States." Jurisdiction of the Corps is established through provisions of Section 404 of the Clean Water Act, which prohibits the discharge of dredged or fill material without a permit. Regional Water- Quality Control Board Jurisdiction is established through Section 401 of the Clean Water Act, which requires certification or waiver to control discharges in water quality. Jurisdictional authority of the CDFG over wetland areas is established under Sections 1601-1606 of the State Fish and Game Code, which pertains to activities that would disrupt the natural flow or alter the channel. bed or hank of any lake, river or stream. A preliminary wetland assessment for the proposed alignment was conducted during the field reconnaissance in July of' 1999. Potential jurisdictional habitat was limited to the bed and batik- of ankof the Marsh and Sand creeks. Indicator wetland species were also observed along man-made drainage ditches on either side of the railroad right-of-way. However, vegetationInthese ditches are dependent on irrigation runoff and the drainages are man-made features constructed City of Brentwood Page 31 Initial Study/Sand Creek Road Extension April 2000 in uplands. The Corps and CDFG typically do not exercise jurisdiction over man-made drainage ditches. although this would have to be confirmed by representatives of both agencies. I Exhibit 4 shows riparian features near the project site Significance Criteria Criteria have been established in determining the significance of potential impacts on biological resources. The CEQA Guidelines identify potentially significant environmental effects on biological resources to include: • a substantial adverse effect, either directly or through habitat modifications, on any special-status species: • a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, or regulations, or by the CDFG or USFWS. • a substantial adverse effect on federally protected wetlands as defined by Section 404 of the Clean Water Act through direct removal, filling, hydrological interruption, or other means; • interfere substantially with the movement of any native resident or migratory fish or wildlife species or with established native resident or migratory wildlife corridors, or impede the use of native wildlife nursery sites: • conflict with any local policies or ordinances protecting biological resources. such as a creek preservation policy or ordinance. • conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Conservation Plan, or other approved local, regional, or state habitat conservation plan. Project Impacts and Mitigation Measures a) Have a substantial adverse impact on a candidata, sensitive or special-status species' LS/M. Although essential habitat for special-status species is generally absent along the proposed alignment, there is a remote possibility that one or more species of concern could occur within the construction zone and could be injured or killed. Construction within the Marsh and Sand creek channels could adversely affect individuals and habitat for the western pond turtle. California tiger salamander, and California red-legged frog in the remote instance that they are present, unless protective measures are taken to ensure that no individuals are within the construction zones and that any habitat is replaced or restored to pre-construction levels. Measures to ensure avoidance of any individuals and minimization of any in-channel disturbance should serve to mitigate any potential impacts on species of concern. Disturbance within the creek channels would require authorization from the Corps, and at minimum an informal consultation with the USFWS to ensure minimal impacts to any listed City of Brentwood Page 32 Initial Study/Sand Creek Road Extension April 2000 Q tin i d ad Propose _ ,Pd. Creek � Proposed - ropose , -- Piped Clt1 Inlet � Sand Creek Road Creek ---" ODE Culverts Inlet > _ SGem Exhibit 4 RIPARIAN FEATURES N CITY OF BRENTWOOD I� SAND CREEK ROAD EXTENSION ■ ■ ■ ■ Proposed Sand Creek Road NEGATIVE DECLARATION l species. This may require preparation of detailed measures to ensure avoidance and mitigation, if required, of any listed species believed to occur within the project area by the USFWS. No mitigation has been required by the USFWS for past projects along the proposed alignment for either California red-legged frog or San Joaquin kit fox (USFWS. 1998). Any mitigation requirements for the project would have to be determined during consultation as part of the Corps permit process. Destruction of any active swallow nests in the existing box culvert under Fairview Avenue would be a violation of the Migratory Bird Treaty Act. Possible take could be avoided by timing any culvert replacement outside the nesting season, as confirmed by a qualified biologist. y The following measures are recommended to mitigate potential impacts on special-status species to less-than-significant levels: Mitigation Measure 3: Proposed improvements shall be coordinated with representatives of the California Department of Fish and Game, the U.S. Fish and Wildlife Service, and the Corps to ensure compliance with appropriate provisions of state and federal Endangered Species Acts. As necessary to provide compliance with applicable regulations, mitigation may be required to prevent inadvertent take of listed species. Details of any required mitigation shall be refined as part of the consultation process and shall ensure adequate protection of listed species and prevent any inadvertent take. Mitigation Measure 4: Preconstruction survey for burrowing owl shall be conducted by a qualified biologist on and adjacent to the proposed alignment prior to any grading to confirm the presence or absence of any new nesting activity along the Union Pacific Railroad right-of-way and creek banks. If a nesting pair of burrowing owls is found, appropriate measures shall be taken to avoid destruction of any active nests. An appropriate buffer shall be established around any active nest based on consultation with CDFG representatives. Construction activities shall be restricted within this zone until the qualified biologist has determined that nesting is complete and the _young have fledged. For non-nesting burrowing owls. passive relocation methods shall be used by the qualified biologist to remove the owls from impact areas. Mitigation Measure 5: Replacement or modifications to the Fairview Road crossing over Sand Creek shall be timed to avoid destruction of active swallow nests on the underside of the structure. Proposed culvert improvements shall be timed to avoid disturbance during the active nesting season (March 15-August 15). A qualified biologist shall be retained to verify that young have fledged and nests are no longer occupied prior to any disturbance during the nesting season. Mitigation Measure 6: If construction activities are required within the Marsh,or Sand Creek channels, coffer dams shall be installed to direct perennial flows through the construction zone(s). Each dam shall be designed to direct flows through a temporary culvert during. the construction period, and exclusionary City of Brentwood Page 34 Initial Study/Sand;Creek Road Extension April 2000 I i I fencing provided within creek channels to direct the movement of amphibian and reptile species of concern into the culvert and away from the construction zone. The; construction zone shall be isolated by the exclusionary fencing, and the area surveyed to ensure no species of concern are present before construction is initiated. with any individuals relocated outside the zone by a permitted biologist. All work within the creek channel shall be supervised by the permitted biologist, and exclusionary fencing shall remain in place during the entire construction phase. b) Have a substantial adverse impact on any riparian habitat or other sensitive natural community? LS/M. Sensitive natural community types are generally absent along the proposed alignment and no significant impacts are anticipated. Routine maintenance of the creek channels segments where crossings are proposed has precluded establishment of riparian habitat, and even the narrow band of freshwater marsh is of limited habitat value. Measures required as part of Corps authorization for modifications to jurisdictional wetlands would ensure that appropriate avoidance and replacement measures are implemented to protect wetland habitat along the creek channels. c) Have a substantial adverse impact on federally protected wetlands? LSIM. Wetland indicators observed during the field reconnaissance were limited to the emergent freshwater marsh vegetation along the beds of Marsh and Sand Creeks, and the narrow bands of sedge and cattail in the ditches along the railroad right-of-way. Corps jurisdictional habitat along creek channels extends to the estimated high water mark, somewhere below the top of bank for both creeks. CDFG jurisdiction is limited to the bank and bed of both creeks. Any modifications to creek channels will require coordination and approval from these agencies. The narrow bands of poorly developed freshwater marsh vegetation along the railroad right-of-way has formed in man-made drainage ditches supported by irrigation runoff. Although the Corps reserves the right to determine whether a particular wate.rbody falls within their jurisdiction on a case-by-case basis, ditches excavated in dry land are typically not considered jurisdictional habitat. This would have to be confirmed through further consultation with the Corps as part of the permit process for the project. There is a possibility that replacement habitat would be required for the creek channel segments affected by the project. This would require preparation of a detailed wetland protection and replacement plan, identifying the location of any mitigation, performance standards, and provisions for monitoring. The following measures are recommended to mitigate impacts on jurisdictional wetlands to less-than-significance levels: Mitigation Measure 7: Proposed culverts over Marsh and Sand Creeks shall be designed with a natural creek bed below them to allow for re-establishment of freshwater marsh habitat under the structures. Cement or rip-rapped channels, and in-channel drop structures shall not be allowed as part of the design of improvements. Revegetation of the creek beds will occur naturally within the natural substrate and supplemental plantings are therefore not required. City of Brentwood. Page 35 Initial Study/Sand Creek Road Extension April 2000 i i Mitigation Measure 8: Any construction on the bed or bank of Marsh Creek shall be designed to minimize disturbance to areas of existing freshwater marsh vegetation. The construction zone shall be clearly marked with silt fencing to prevent accidental incursion into the creek channel outside the construction zone. Mitigation Measure 9: Modifications to the bank and bed of Marsh and Sand Creeks shall be coordinated with representatives of the Corps and CDFG and any necessary permits or authorization shall be obtained as necessary. This may require preparation of a wetland delineation and a wetland protection and replacement plan. Project grading and construction shall not be initiated until any required authorization is obtained from the Corps and CDFG, pursuant to Section 404 of the Clean Water Act and Section 1601-1603 of the Fish and Game Code, respectively. d) Interfere tiviih movement of native fish or wildlife species.' LS/M. The proposed roadway corridor is not expected to interfere substantially with the movement of wildlife or impede use of any wildlife nurseries. Construction of bridge improvements would only temporarily affect the Marsh Creek and Sand Creek corridors, and measures to protect possible dispersal by California red-legged frog, western pond turtle and fish species would serve to minimize potential impacts on other species associated with the creeks. Fish and wildlife would continue to utilize the creek corridors once construction is completed. e. f) Conflict with local policies or ordinances protecting biological resources or an),adapted Habitat Conservation Plans or Natural Communih- Conservation Plans? NI. Proposed roadway improvements would not conflict with any local policies or ordinances protecting. biological resource, such as a tree preservation or creek protection ordinance, since none have been adopted by the City of Brentwood. No impact is therefore anticipated. Similarly, proposed improvements would not conflict with any adopted Habitat Conservation Plan, Natural Community Conservation Plan or other approved conservation plan. No such conservation plans have been adopted encompassing the project vicinity, and no impact is therefore anticipated. V. Cultural Resources Environmental Setting The General Plan EIR notes that the much of the Brentwood Planning Area has a lo\v to moderate sensitivity to the presence of prehistoric sites and a moderate to high sensitivity for historic resources. The anticipated highest potential for discovering prehistoric resources is along drainageways, including Marsh Creek and Sand Creek. There is no record of previous archeological investigations on or adjacent to the Sand Creek Road site.. Pro-ect Impacts and Mitigation Measures a) Cause substantial adverse change to significant historic resources? NI. No historic resources have been identified on either portion of the site so no impact to historic resources is anticipated. City of Brentwood Page 36 Initial Study/Sand Creek Road Extension April 2000 i b. c) Cause a substantial adverse impact or destruction to archeological or paleontological resources) LS/M. There is a remote but potentially significant possibility that construction activities near Marsh Creek and Sand Creek, including creek crossings, crossing of the railroad tracks, construction of the roadway and/or utility trenching could disturb subsurface archeological resources, such as lithic scatter, campsites, milling areas and perhaps burial sites. This is based on Figure 15 of the General Plan EIR, which shows the highest probability of encountering resources along major creek banks. Construction of portions of the roadway extension away from creek banks may also uncover archeological resources. In the event that such resources are encountered, the following mitigation is recommended to reduce any potential impacts to archeological or paleontological impacts to a level of insignificance. Mitigation Measure 10. Should archeological or paleontological artifacts or remains be discovered during construction of the project, work in the vicinity of the find shall stop immediately until a qualified archeologist or paleontologist, as appropriate, can evaluate the site and determine the significance of the find. Project personnel shall not collect or alter cultural resources. Identified cultural resources shall be recorded on forms DPR 422 (archeological sites) and/or DPR 523 (historic resources). If human remains are found, the County Coroner shall be contacted immediately. d) Disturb anv human resources? LS/M. A remote possibility exists that human resources could be uncovered on the site during construction activities. Adherence to Mitigation Measure 10 would reduce such impacts to a level of less-than-significant.. V1. Geology and Soils Environmental Setting The Brentwood Planning Area is located along the northwestern margin of the San Joaquin Valley, with Mount Diablo to the west and Suisun Bay and the Sacramento/San Joaquin River Delta to the north. Brentwood lies on the border of two geomorphic provinces: the Coast Range and the Great Valley Province. Geologic conditions within the. Brentwood Planning Area are dominated by consolidated sediments along the western and southern sides of the area (low lying foothills) and by young alluvial deposits throughout the central and eastern portions. Surface soil conditions in the Brentwood area reflect the nature of the underlying sediments, which are generally fine-grained in nature and comprised of clay, silt and fine-grained sand. Granular soils are found in limited quantities along rock outcroppings in the western and southern portions of Brentwood and in adjacent area to the north. Based on information published by the United States Department of Agriculture (1977), most of the Brentwood area is covered by soil described as texturally as clay and clay loam. Loamy sand and silty clay loam exists in small quantities along stream channels and near sandstone beds in the western and southern portions of the Brentwood Planning Area. City of Brentwood Page 37 Initial Study/Sand Creek Road Extension April 2000 California, and the Bay area in particular, is subject to frequent seismic activity. Many of the faults within theiSan Francisco Bay are north-south trending faults associated with tectonic plate movement, particularly the San Andreas and Hayward faults. Frequent fault activity is common in the v,;estern portion of Contra Costa County, although less common in eastern Contra Costa County. However, significant ground shaking and ground rupture is possible along faults within and near Brentwood. Known regional faults include the San Andreas fault (45 miles west of Brentwood), Hayward Fault (27 miles west), Calaveras Fault, Greenville Fault (25 miles southeast), Concord-Green Valley Fault (15 miles west). Three faults have been identified within the Brentwood community. The Antioch-Davis fault traverses the western portion of the planning area, This fault extends for approximately 18 miles in a north-south direction. This fault has been included within an Earthquake Zone under the auspices of the Alquist-Priolo Act. The Brentwood-Sherman Island fault trends in a north-south direction approximately 2 miles east of the Antioch-Davis fault. The Midland fault lies approximately 2 miles east of the Brentwood Planning Area. During a seismic event, rapid loading of saturated fine-grained soil may create excess pore pressure which may not dissipate rapidly. This excess pressure may result in a loss of shear strength. known as "liquefaction." Groundwater level in the Brentwood area is generally deeper than 50 feet. which results in a low potential for liquefaction. However, locally high water tables . may exist where liquefaction could occur, typically alluvial soils and sand dune areas. Project Impacts and Mitigation Measures a) Expose people or structures to potential substantial adverse impacts, including loss, injury or death related to ground rupture, seismic ground shaking, ground failure, or landslides? LS. The site is subject to ground shaking caused by a number of regional and local faults as described above. Construction of the proposed roadway and storm drain line would subject these new improvements to the potential for damage caused by seismic ground shaking. Of special concern would be crossings over Sand Creek and Marsh Creek. Since there are no local or regional faults in or near the project area, the risk of ground rupture is considered low and considered less-than-sign.ificant. It is expected that the City of Brentwood would incorporate the most recent and stringent seismic safety design features into both portions of the project. The project sites are generally flat and would not be subject to landsliding, however, unless properly stabilized. slope failure could occur in the area of the two creek crossings. As part of the design, appropriate:slope stabilization efforts would incorporated into the project so that potential impacts related to slope stability would be less-thorn-significant. b) /s the site subject to substantial erosion the loss of topsoil? LS. The site would require grading to.construct the roadbed, underground utilities and creek crossings. The quantity of material required for grading is unknown at this time. A potentially significant impact would be erosion of graded material off of the project site, which could be deposited into Marsh Creek, Sand Creek, into nearby streets and onto nearby private properties. Potential site erosion could also have a negative secondary effect of degrading surface water quality by deposition of construction debris and other material into Marsh and Sand Creeks. Adherence to Mitigation Measure 12 will reduce potential erosional impacts to it level of less-than-significance. City of Brentwood Page 38 Initial Study/Sand Creek Road Extension April 2000 i i i c) Is the site located on soil that is unstable or result in potential lateral spreading, liquefaction, landslide or collapse? LS. Based on information contained in the City of Brentwood General Plan EIR, the possibility exists that liquefaction could occur within local creeks during a seismic event. However, since the majority of project improvements would constructed outside of creekbeds, less-than-significant impacts are anticipated with regard to liquefaction. Since the project area is essentially flat, no impacts are anticipated with regard to landslide. d) Is the site located on expansive soil? NI. Based on information contained in the General Plan EIR, the possibility is remote that expansive soils exist near the project site, so no impact would result. e) Have soils incapable of supporting on-site septic tanks if setivers are not available? NI. The proposed project involves construction of public works projects would not require sewer or septic tank service. VII. Hazards and Hazardous Materials Environmental Setting The General Plan EIR notes that the city has historically been surrounded by agriculture and oil field operations. Development would encroach onto areas where hazardous materials and wastes have been handled and disposed. Properties on and adjacent to the proposed road extension have historically and continue to be farmed. As such, there is a potential for residue in the soil from previous activities. such as pesticides, herbicides, fertilizers and similar chemicals. Project Impacts and Mitigation Measures a-c) Create a significant hazard through transport of hazardous materials or release or emission of hazardous materials? LS. The proposed project would include construction of a new roadway in the center portion of the community. Although the proposed Sand Creek Road would not generate hazardous waste, it could be used as a transport route for hazardous materials. Transport of hazardous materials is regulated by state and federal agencies and is outside the jurisdiction of the City of Brentwood. Therefore. this impact would be considered less-than-significant. d) Is the site listed as a ha..ardous materials site? LS/M. Although not listed as a hazardous materials site, portions of the project area have historically been used for agricultural production, including fruit orchards and field crops. The possibility exists that residual contaminants remain in the soil, which could be a potential hazard for construction workers and others near the site. This is considered a potentially significant impact which can be reduced to a less-than-significant level through adherence to the following mitigation measure: Mitigation Measure l i: The City shall prepare a Phase I hazardous materials report documenting the presence or absence of soil, water or building material substances on the site. if recommended by the Phase i report, additional studies may be required. All measures recommended by the report(s), regarding possible City of Brentwood Page 39 Initial Study/Sand, Creek Road Extension April 2000 remediation of hazardous materials shall be followed, as may be specified by the report(s). e.f) Is the site located within all ali-poi-t land use plan of o Imbllc airpoi-t or prlvate airstrip? N1. The project site is not located near a public or private airstrip so no imp(1ct. are anticipated. g) Interference with an emergency evacuation plan? NI. Construction of the proposed Sand Creek Road extension would provide for an additional emergency evacuation route within Brentwood, so no impact would result. VIiI. Hydrology and Water Quality Environmental Setting The project site lies in the central portion of Brentwood. Marsh Creek flows through the center of the area. This creek is a regionally significant creek that originates in the foothills of Mt. Diablo and flows north through the Brentwood planning area to the San Joaquin River. Several smaller creeks flow into Marsh Creek, including Sand Creek, Dry Creek and Briones Valley Creek. Flooding in the Brentwood area has been primarily caused by overtopping of the banks of Marsh Creek. V Pri�ect Impacts and Mitigation Measures a) Violate ani• tivater quality standards or tivaste discharge requirements? LS/M. Construction of the proposed roadway improvement would necessitate grading, excavation and overcovering of the soil. The amount of grading is not known at this time, however, proposed grading is anticipated to increase the possibility of soil erosion into both Marsh Creek and Sand Creek. This could be a potentially significant impact. Mitigation Measure 12 will ensure that potential water quality impacts are reduced to a less-than-significant level. Mitigation Measure 12: A Stormwater Pollution Prevention Plan (SWPPP) shall be prepared in accord with City and RWQCB standards to control storm water runoff and erosion into Marsh Creek, Sand Creek and adjacent streets and properties. Specific measures to be included in the SWPP are listed below. Applicable measures shall be included in contractor specifications for construction of the proposed project. • Leave existing vegetated areas undisturbed until construction of improvernents on each portion of the project are actually ready to commence; • Immediately revegetate or otherwise protect all disturbed areas from both wind and water erosion upon completion of grading activities; • Collect stormwater into stable drainage channels, from small draina�(Te basins, to prevent the buildup of large, potentially erosive stormwater- flows; • Direct runoff away from areas disturbed by construction: City of Brentwood Page 40 Initial Study/Sand Creek Road Extension April 2000 • Use sediment ponds or siltation basins to rap eroded soils before runoff is discharged into on-site or off-site drainage culverts or basins', To the extent possible. schedule major site construction involving excavation and earth moving during the dry season; • Develop and implement a program for the handling, storage, use and disposal of fuels, hazardous materials and construction debris. The prograrn should also include a contingency plan for accidental spills. In addition, construction plans for the project shall be designed to ensure that permanent bank stabilization and erosion control measures are included in final project design, especially near proposed stormwater outfalls into adjacent creeks. Should the project disturb 5 acres of land or more, a General Construction Permit is required to be obtained by the City of Brentwood from the State Water Resources Control Board. Application for this permit must be accompanied by a SWPPP as outlined above. In terms of long-term management to minimize water quality degradation, the City of Brentwood would normally and customarily sweep Sand Creek Road so that dust, debris and other items could not be eroded into creeks. The City also stencils "No Dumping.- Drains to Delta" near all storm drain inlets as a part of an on-going public information program. b) Substantially deplete groundwater recharge areas or loivering of water table? LS. Although currently vacant lands would be converted from pervious, agricultural land grazing lands to paved roadway, the arnount of paving would be insignificant and would not substantially deplete groundwater recharge areas. Such impacts would therefore be considered less-than-significant. c) Substantially alter drainage patterns, including streambed courses such that substantial siltation or erosion would occur? LS/M. Construction of the proposed roadway would alter local drainage patterns due to recontouring and grading of the land within the project area. The addition of stormwater runoff into Sand Creek and Marsh Creek would also increase the potential for erosion into these bodies of water. Adherence to Mitigation Measure 9 would reduce potential erosion and siltation impacts to a less-than-significant level. Based on discussions with the project civil engineer for recent land developments on adjacent properties (.SPA L in the City of Brentwood), the amount of future stormwater runoff that could flow into nearby creeks have been included in hydrology calculations for the land development projects, so that less-than-significant impacts would be expected. d.) Substantially alter drainage patterns or result in flooding, either on or off the project site' LS. Construction of the proposed Sand Creek Road extension would change local drainage patterns. Existing natural swales and other surface drainage flows would be altered due to anticipated grading for the roadway. Drainage would be routed through newly constructed underground pipes, culverts and similar facilities for ultimate discharge into.Sand Creek and Marsh Creek. The amount of increased storm drain runoff from the proposed roadway has been estimated as part of recent hydrologic studies for abutting subdivisions. Construction of the proposed roadway is not anticipated to result in any type of flooding. on or near the site. This would be considered a less-than-sign ificall t impact. City of Brentwood Page 41 Initial Study/Sand Creek Road Extension April 2000 i I i e) Create stormwater runoff that would e_viceed the capacity of drainage sYstenrs or add substantial amounts.of polluted runoff? LS. Construction of the proposed improvements, would add!paved, impervious surfaces to an area where none currently exist. A portion of the amouni of increased stormwater runoff from the site has been included in recent hydrologic calculations for abutting subdivisions (Lyon Place. and Ashton Grove). According to Countv Flood Control District officials, the remaining amount of increased stormwater runoff could be accommodated in both Sand Creek and Marsh Creek, so that less-than-significant impacts would occur. Adherence to Mitigation Measure 9 would reduce potential stormwater pollution to a less-than-.significant level. f) Sub.stantiallY degrade water quality? LS/M. Refer to the analysis and mitigation measure under "a," above. Place housing within a 100-year flood hazard area as mapped by a Flood Insurance Rate Map or redirect flood water flows, including danr failure? NI. The proposed project does not involve housing, so there would be no impacts related to increasing flood hazard potential for new housing. j) Result in inundation by seiche, tsunami or mudflows? NI. The site is not located near a major body of water that could result in a seiche. The risk of potential mudflow is considered low based on the generally flat topography of the surrounding. area. Therefore. no impacts are anticipated with regard to seiche or mudflow incidents. IX. band Use and Planning Environmental Setting The Sand Creek Road portion of the project area is currently vacant and has historically been used for agriculture and/or cattle grazing. Two single family detached subdivisions have been approved by the City of Brentwood east of Minnesota near the proposed roadway and are currently under construction. Ashton Place, developed by Pulte Homes contains approximately 1 l3 dwellings and is sited immediately north of the proposed roadway. Immediately south of the proposed road extension, Lyon Grove contains approximately 122 dwellings at full build out. Lyon Homes is the builder of this subdivision. Other land uses in the vicinity of the proposed roadway includes an elevated Union Pacific railroad line that bisects the proposed roadway alignment. A number of older single family dwellings have been constructed north of proposed road alignment and east of the railroad tracks. The majority of land adjacent to the project site lies within the incorporated boundary of the City of Brentwood, with the remainder of the area within the unincorporated portion of Contra Costa County, although within the sphere of influence of Brentwood. Annexation to the City of Brentwood is anticipated in the near future, although annexation is not a part of this project. Exhibits 5 and 6 show existing General Plan and zoning designations near the project. t i City of Brentwood Page 42 Initial Study/Sand Creek Road Extension April 2000 i • I i L VL SPA L o NC . RE — _ - OB - -------------- Park � ���� ■ ■ ■'■ ■ ■ ■ ■ ■ ��■ SPA «B77 SPA 6171 SPA RIE. VL p ti o. -- — - �y - L— RE - — Park !! LI.. H L ` � � I SPA «C77 OR — J Middle O-- School ------ Park ! - SPA «O 7, LNC �a Exhibit 5 GENERAL PLAN DESIGNATIONS SPA Special Planning Areas Residential RE Ranchette Estate VL Very Low Density L Low Density M Medium Density H High Density I i Industrial/Commercial/Office LI Light Industrial NC Neighborhood Commercial OB Business Office OP Professional Office N CITY OF BRENTWOOD SAND CREEK ROAD EXTENSION ■ ■ ■ ■ Proposed Sand Creek Road NEGATIVE DECLARATION ! I I r! R-1-10 w 1 R-2- !PD-26 _ I — Q A-2 I i C-2 o _ JR-100 and reeK oB \ COB ti — _ R-2 coR LL •..��■� IIID 11 ■-I.I 111 II1L-II, II' ■ N C \ =RE- A-2 PD-6 Q, —PD-4 PD 26 _ d R-11 A-2 - � _ R-40: - A2 PD-10 -2:- PD-9 SOURCE: City of Brentwood Zoning Map(undated) Contra Costa County Zoning Map(undated) NOTE. Shaded portions of Exhibi!depict unincorporated properties. County Zoning A-2 General Agricultural R-40 Residential Exhibit 6 R-100 Residential ZONING DESIGNATIONS COB Commercial COR Commercial C-2 Commercial R-1 Residential R-1-10 Residential R-1-E Residential R-2 Residential RE Ranchette Estate PD-2 Planned Developmant PD4 Planned Development PD-6 Planned Development PD-9 Planned Development N PD-10 Planned Development CITY OF BRENTWOOD. PD-26 Planned Development SAND CREEK ROAD EXTENSION Proposed Sand Creek Road NEGATIVE DECLARATION Project Impacts and Mitigation Measures al PhvsicallN. divide an established comnutnih•? NI. The proposed roadway would generally parallel Marsh Creek, which presently serves as an east-west barrier in the Central portion of Brentwood. Construction of the proposed road would serve to improve circulation and access in this portion of Brentwood, so no impacts would result with regard to dividing the community. Similarly, construction of the proposed storm drain facility would be in an underground location, so that there would be no impact. b) Conflict with any applicable land use plan, policy or regulation? NI. The proposed extension of Sand Creek Road is included in the City's Circulation Element as an arterial roadway. Public works projects, such as the proposed roadway extension and the storm drain facility, are not regulated by the City's zoning ordinance. Both projects are included, however, in the City's Five-Year Capital Improvement Program. Therefore, no impacts are anticipated with regard to land use plans. c) Conflict with anv habitat conservation plan? NI. The site is not located within a habitat conservation plan area so no impact would occur. X. 1\1ineral Resources Environmental Setting The Brentwood General Plan identifies four major sources of minerals in the community: oil, <_as. sand and coal. None are believed to be found within the project area, based on Figure 9 of the Brentwood General Plan EIR. Project Impacts and Mitigation Measures a, b) Result in the loss of availabilit}? of regionally or locally significant mineral resources" NI. The Brentwood General Plan does not indicate that the project site is underlain by mineral resources of local or regional sjanificance. XI. Noise (Note: This section has been prepared based on a acoustical report for the proposed project prepared by Charles Salter Associates in November 1999. A copy of this report is on file with the Brentwood Engjneering Department.) Environmental Setting Existing noise sources within and near the project site was measured in late summer, 1999 via 24-hour noise measurements conducted west of existing single family dwellings along Minnesota Avenue. At this location, approximately 45 feet west of the roadway centerline, noise was measured at 65 dB (decibels). Existing land uses near the project site include scattered single family residences on the east side of Fairview Avenue near Sand Creek, a single family residence on the east side of Minnesota Avenue near the proposed road right-of-way, two single family residential subdivisions on both the north and south side of the proposed right of way of Sand Creek Road and scattered single City of Brentwood Page 45 Initial Study/Sand Creek Road Extension April 2000 family residences north of the proposed road right-of-way and east of the Union Pacific railroad tracks. Primary generators of noise include vehicular traffic from Minnesota Avenue and construction noise from nearby single family subdivisions. Another 24-hour none measurement was taken approximately 250 east of Fairview Avenue. The Day-Night Average Sound Level (DNL) was 52 dB in this location, representative of the general existing noise environment in the vicinity of the project. The DNL measurement has been established by the U.S. Environmental Protection Agency to describe noise events over a 24- hour period. Penalties are applied to noise occurring during nighttime hours (10 p.m. to 7 a.m.). The penalty is intended to account for increased sensitivity of people during normal sleeping hours. The Noise Element of the Brentwood General Plan requires that noise sources generated by transportation sources, such as roads, should be mitigated to a noise level of 60 decibels using the DNL (Day-Night Noise Level) measurement system for outdoor activity areas. Typically these are back yard areas. Where it is not possible to achieve a noise level of 60 dB, an exterior noise limit of 65 dB DNL may be allowed so long as interior noise measurements are in compliance with standards. The applicable indoor noise standard for the project included in the Brentwood Noise Element for transportation noisee sources is 45 dB DNL. The acoustic consultant also recommends another applicable noise guideline which is used by the California Department of Transportation to assess increases in noise level. A noise increase would be considered substantial when the predicted noise level would exceed existing noise levels by 12 dB. Project Impacts and Mitigation Measures a, c-d) Would the project expose persons or generation of noise levels in excess of.standards established bY the General Plan or other applicable standard: LS/M. Two types of noise have been identified which could be associated with the proposed roadway extension: short- term temporary noise caused by construction of roadway improvements and the proposed storm drain facility and long-term permanent noise associated with vehicles traveling on the new roadway. Shore lean noise, Short-term noise would be generated by grading and excavation activities for both projects. including clearing-, and Llrubhing of the site, leveling and compaction of the soil. Backhoes would likely be employed to trench for the storm drain line. Roadway construction would include installation of concrete for curb and gutters and asphalt concrete for the roadbed. Each of these portions of the construction phase of the project would require bulldozers, concrete trucks, dump trucks and other types of heavy equipment normally and customarily employed-for this type of a project. i Use of heavy equipment would likely increase noise in the short term, during the construction phase of the project. This would be considered a significant impact on existing single. family residences near the proposed roadway site. The following mitigation measure is therefore proposed to reduce short-term construction noise to a less-than-significant level. City of Brentwood Page 46 Initial Study/Sand Creek Road Extension April 2000 Mitigation Measure 13: Construction specifications for the Sand Creek Road extension shall include language to limit construction activities (including maintenance of equipment, equipment warm up and delivery of material) shall occur between the hours of 7 a.m, to 6 p.m., Monday through Saturday, excluding state and federal holidays. Exceptions may be granted in writinc, by the Brentwood City Engineer. Lone-term Iroise Future noise levels for autos and trucks using the proposed Sand Creek Road extension were estimated using a version of the Federal Highway Administration's Traffic Noise Prediction Model and incorporating the California Vehicle Noise Emission Level curves. Table 2, below, summarizes and compares existing noise levels and anticipated future noise levels should the project be constructed. Noise projections are expressed in DNL format. Table 2. Existing and Future Noise Exposure Levels Roadway Link DNL (dB), 50' from Centerline _ Existing Future (2010) Sand Creek Rd Fairview to Minnesota 52 71 Minnesota to O'Hara 52 71 East of O'Hara __ 52 j 68 Fairview Ave. North of Sand Creek 71 I 65 South of Sand Creek 71 68 1✓linn-es ota Ave. North of Sand Creek 59 60 South of Sand Creek 59 64 Source: Salter Associates, 1999 The noise level for existing single family dwellings lying north of the Union Pacific Railroad tracks and Marsh Creek would be expected to increase from 52 decibels to approximately 64 decibels based on additional vehicular traffic. For the few homes located near the southeast corner of Minnesota Avenue and the roadway extension, ambient noise levels could be expected t increase from approximately 59 dB to 69 dB in the future. Two single family subdivisions (Ashton Place and Lyon Groves) are currently under construction east of Minnesota Avenue. Some homes within these developments have been completed: Homes within these developments would be located approximately 70 feet from the centerline of the proposed roadway. In the year 2010, future noise from the roadway is anticipated to reach DNL 69 dB. As part of the construction of each of the subdivisions. six- foot masonry noise barrier walls have been constructed along both the north and south sides of the proposed right-of-way of Sand Creek Road. Construction of dwellings near- the proposed right-of-way have also been designed to meet the City's interior noise level. The acoustic barrier constructed along the south side of the future roadway has been extended to run along the northerly property line of the existing single family residence. lying on the east side of Minnesota Avenue and south of the proposed roadway. A single farnily dwelling on the east side of Fairview Avenue south of the proposed roadway right-of-way would also be exposed to future noise levels for the roadway in excess of City standards. City of Brentwood Page 47 Initial Study/Sand Creek Road Extension April 2000 The above impacts would be considered significant long-teen noise impacts based on future traffic volumes on the proposed Sand Creek Road. The following mitigation measure is recommended to reduce impacts of-term noise levels for the Sand Creek Road extension to a level of less-than-significance: Mitigation Measure 14. The following noise reduction measures shall be carried out by the City of Brentwood. (i) For the single family dwelling located on the east side of Fairview Avenue south of the proposed road right-of-way, a five to seven foot tall noise barrier fence shall be constructed between the primary use are and the proposed roadway extension. If wood is used as the construction material, it should be constructed free of cracks and gaps and boards should overlap to cover seams. (ii) The outdoor activity areas for homes located on the north side of the proposed road right-of-way and east of the railroad tracks shall be protected by noise barriers of at least six feet tall. if wood is used as the construction material. the same conditions as (i) apply. (iii) For the existing residences located at the intersection of Minnesota Avenue and the proposed roadway extension, replacement sound-rated windows may be required to achieve the City's indoor noise standard of DNL 45 dB. The only windows that may require replacement would be those having direct line of sight to the travel lanes of the proposed road. (ivl Additional analysis for each of these areas is recornmended by the acoustic engineer during construction of the propose road, once final grades are established. This will allow for final review of acoustic impacts and specific construction to fully mitigate noise to City standards. Exhibit 7 shows the location of required noise barriers. h) Evposure of people to excessive groundborne vibration or groundborne noise levels? LS/M. Construction of the proposed roadway extension may expose nearby residents to groundborne vibration relating to grading, excavation and construction activities. These impacts could be considered significant, given that large equipment would be required for the project, and would be significant. However, such impacts would also be short-term in nature, lasting only as long as the construction phase of the project. Adherence to Mitigation Measure 13, which would limit hours of'construction, would also reduce groundborne impacts to a level of less-than-significance. e,l li'ould the pro)ect expose residents to excessive noise generated bY a public or private airport' NI. The project site is not located near any a public or private airport so that the proposed project would not be subject to excessive airport noise. i i City of Brentwood Page 48 Initial Study/Sand Creek Road Extension April 2000 d r c i Q LL 2 ° Proposed 0 — Noise K Barrier and Creek Road 00900 ,.•••i•• ••�• •�/E�f■� ■ SOME ■ fill- Existing ----------- • Noise �• Barriers Proposed a Noise o Barrier J - Exhibit 7 NOISE BARRIER LOCATIONS 0000000000 Proposed Noise Barriers N Existing Sound Barriers CITY OF BRENTWOOD! SAND CREEK ROAD EXTENSION ■ ■ ■ ■ Proposed Sand Creek Road NEGATIVE DECLARATION I I XI1. Population and Housing Project Impacts and Mitigation Measures a) Induce substantial population growth in an area, either directh or indirectly? LS. Construction of the proposed project would not directly add new population to the central portion of Brentwood, since the project does not involves residential development. Construction of the proposed Sand Creek road extension could indirectly induce additional population growth, however, residential development is presently occurring in this portion of Brentwood in the absence of the proposed roadway. Completion of the road was assurned as part of land use, transportation and population growth projections for the City of Brentwood as part of the General Plan. Therefore, less-than-significant impacts are anticipated with regard to potential growth inducement. b,c) Would the project displace substantial numbers of existing housing units or people? NI. The site is presently vacant. Implementation of the proposed project would therefore displace neither housing units or people. 1111. Public Services Environmental Setting • Fire Protection. Fire protection is provided to the area by the East Diablo Fire Protection District, which provides structural fire suppression and rescue services from four stations and an administrative headquarters facility located within or immediately adjacent to the. Planning Area. The District maintains mutual aid agreement~ with all other fire departments within the County. • Police Protection. Police protection is provided by the Brentwood Police Department which is headquartered at 500 Chestnut Street near the Civic Center. The Department maintains a staff of 27.5 sworn officers, support and reserve officers. • Schools. Educational facilities are provided by the Brentwood Union School District which operates kindergarten through eighth grade school services within the community and the Liberty Union High School District. • Maintenance. The City of Brentwood provides public facility maintenance, lllcludlllg roads, parks, street trees and other public facilities. Environmental'Impacts and Mitigation Measures a. bj Fir and police protection? LS. Construction of the proposed project would not directly increase demand for fire and emergency services since residential construction is not proposed as part of the project. Although extension of the proposed roadway could indirectly induce population growth in the vicinity of the project, completion of the road extension would also facilitate access to the area by emergency service and maintenance vehicles. Therefore, less-than-significant impacts are anticipated. cj Schools:';LS. Construction of the project would not directly increase demand for school facilities since residential construction is not proposed. Although new residential development could occur based on increased access to the central portion of Brentwood. City of Brentwood Page 50 Initial Study/Sand Creek Road Extension April 2000 i i each new residential dwelling is required to pay mitigation fees to the school district to off- set potential educational impacts. Such impacts would therefore be less-thalr-.signijicanr d) Maintenance of public facilities, including roads? NI. The project, if approved. Would incrementally increase the long-term maintenance demand for public facilities. However. the facility would be constructed to City standards and fully inspected during the construction phase. Therefore, the need for increased maintenance would not occur in the short- or mid-term, but would be a long-term issue with the City. No impacts are therefore anticipated. XIS'. Recreation Environmental Setting The site currently vacant and generally contains no recreational facilities. A multi-purpose recreational trail has been constructed along the south side of Marsh Creek in the eastern portion of the project area by the East Bay Regional Parks District. The City of Brentwood has planned a park and recreational trail system on the east side of Fairview Road. Project Impacts and Mitigation Measures a) Would the project increase the use of existing neighborhood or regional parks? NI. The proposed development would not directly cause an increase in demand for regional park facilities, since no residential development is proposed. Although indirect construction of new residential development could occur, the potential for increased residential development would be off-set by park in-lieu fees chara.ed by the City to new residential development to acquire and develop new parks in Brentwood. No impacts are therefore anticipated. b) Does the project include recreational facilities or require the construction of recreational facilities? LS/M. The project does not include recreational facilities. however, short-term and potentially-.significant impacts to the existing East Bay Regional Parks District recreational trail on the south side of Marsh Creek are anticipated due to the proposed construction of a storm drain outfall structure into Marsh Creek. Construction of the outfall could result in removal of the existing asphalt trail for storm drain line trenching and disruption of the right-of-way for trail users. The following mitigation measure is therefore recommended to reduce this impact to a less-than-significant impact. Mitigation Measure 15. The City of' Brentwood shall ensure that: (i) Following construction of drainage improvements, all East Bay Regional Parks District trail facilities are replaced to match pre-construction conditions: (ii) A detour around construction areas shall be provided for trail users; and (iii) All necessary encroachment permits shall be obtained from the East Bay Regional Parks District. City of Brentwood' Page 51 Initial Study/Sand.Creek Road Extension April 2000 XV. Transportation/Traffic i Environmental Setting [The following section represents a summary of a circulation analysis of the proposed project completed by George Nickelson, traffic and transportation consultant. The full text of the analysis is on file in the Brentwood Public Works Department.] Streets that provide access in and around the study area include: • Brentwood Boulevard (SR4), a north-south arterial roadway east of the site; • Minnesota Avenue, a north-south arterial road through the central portion of the project site; • Fairview Avenue a north-south arterial which forms the westerly extent of the roadway extension; • O'Hara Avenue/Walnut Boulevard is a partially existing north/south roadway providing access through the central portion of Brentwood. South of the proposed Sand Creek Road extension, Walnut Boulevard contains a mix of two and four lanes. North of the proposed Sand Creek Road extension O'Hara Avenue is a proposed roadway. The City has recently completed the Sand Creek Road/O'Hara Avenue Loop east of the project area. West of the project site, the new State Route 4 Bypass is currently under construction, slated for completion from Lone Tree Way to Sand Creek Road in late 2000. This project includes construction of Sand Creek Road from the Bypass east to approximately Fairview Avenue to link with the roadway segment being analyzed as part of this project Regional access to and from the site is provided by State Route 4, linking Brentwood with Antioch. Pittsburg and Interstate 80 to the west. Vasco Road provides access to the south, to Livermore and Interstate 580. Should the proposed roadway extension not be undertaken, additional traffic would be diverted to Central Boulevard and Dainty Avenue during the p.m. period. The combined volumes on both roads are expected to be approximately 600 vehicles during the p.m. peak hour in the year ?010. The 800 p.m. peak hour vehicles diverted from Sand Creek would significantly impact traffic flows on both Central Boulevard and Dainty Avenue. Peak hour volumes on Central Avenue would more than double, resulting in potential congestion problems along both roadways. The intersections along both roads (particularly the stop sign controlled intersections of Central/Dainty, Central Griffith, Central O'Hara and Second/Second) could be impacted. The Central Avenue/O'Hara Avenue is planned to have a four-way stop sign in the future. The extension of Sand Creek Road is shown as an integral part of the City's circulation system in the Circulation Element of the General Plan and has also been included within the City's Capital Improvement Program. Project Impacts' and Mitigation Measures a) Cause an increase in traffic which 1S substantial to existing traffic load and street capac11\''l LS/M. Future baseline conditions were determined for the project area, which included traffic demand that would be expected should the Sand Creek Road extension be completed as proposed. It is assumed that in the absence of a final roadway link between Fairview Avenue and Brentwood Boulevard, much of the traffic on Sand Creek Road would be City of Brentwood Page 52 Initial Study/Sand Creek Road Extension April 2000 I forced to divert to Central Boulevard and Dainty Avenue to access an alternative route to Brentwood Boulevard. A portion of the Sand Creek Road traffic could also use Lone Tree Way to the north as an alternative east-west route. The Sand Creek Road connection between the SR4 Bypass and Fairview Avenue is expected to attract approximately 1,000 a.m. peak hour vehicles and 1,300 p.m. peak hour vehicles. Of the 1,300 p.m. vehicles, 800 vehicles are expected to and from the east on the extension of Sand Creek Road east of Fairview Avenue. Because the projected p.m. peak hour traffic is substantially higher than the morning peak hour traffic, the traffic analysis has focused on the p.m. condition as a worst case condition. The proposed extension of Sand Creek Road has been evaluated in terms of general traffic floe- conditions along the corridor and specific traffic flow conditions at the following intersections: • Sand Creek Road/Fairview Avenue • Sand Creek Road/Minnesota Avenue • Sand Creek Road/O'Hara Avenue • Sand Creek Road/Brentwood Boulevard Projected p.m. peak hour traffic flows in the year 2010 are expected to be between 1,000 and 1,100 on the proposed Sand Creek Road extension between Fairview Avenue and the proposed extension of the O'Hara Road connector east of the Union Pacific railroad tracks. Between the proposed O'Hara Avenue connection and Brentwood Boulevard the p.m. peak hour traffic is anticipated to be approximately 450 vehicles. These volurnes would be within the capacity of a two-lane roadway as proposed by the City. It is assumed that Sand Creek Road would be widened at intersections to accommodate turning movements. The projected p.m. peak hour volumes at the four study intersections have been derived from the Eastern Contra Costa County traffic model and are as follows. At a signalized intersection, LOS is determined by calculating the volume of conflicting turning movements the intersection during a one-hour period, and dividing that total by the design capacity to accommodate those movements. This calculation yields a volume/capacity (v/c) ratio. The resulting v/c ratio corresponds to LOS ratings, which range from LOS "A" to "F". The range from "A" to "F" describes increasing levels of traffic dernand, and corresponding increases in vehicle delay and deterioration of' service. (Please see Appendices for LOS definitions and calculation sheets). LOS "A" represents free-flow conditions with little or no delay at intersections. LOS "E" represents unstable flow conditions with volumes at or near design capacity. Vehicles are likely to experience major delays (40 to 60 seconds) crossing an intersection. Under LOS "E", minor.incidents may lead to forced flow or jammed conditions. LOS "F" represents a "jammed" condition where traffic flows exceed design capacity, resulting in long queues backing up from all approaches to the intersection. City of Brentwood Page 53 Initial Study/Sand-Creek Road Extension April 2000 • Sand Creek Road/Fairview Avenue LOS "A," 0.50 • Sand Creek Road/Minnesota Avenue LOS "D," LOS "B"* • Sand Creek Road/O'Hara Avenue (future) LOS "F," LOS "A"* • Sand Creek Road/Brentwood Boulevard LOS "A"' 0.23 Note: LOS designations refer to outbound traffic for side streets, in-hound left turns for major streets Based on the above projections, there would be generally free flowing traffic along the proposed roadway extension with minimal delays. However, at the Sand Creek Road/Minnesota Avenue and the Sand Creek Road/O'Hara Avenue intersections, there would be substantial delays for traffic entering Sand Creek road from side streets. In particular, the O'Hara Avenue approaches would experience long delays typical of LOS "F." This would be a significant impact. With the installation of a traffic signal at both intersections, the LOS would improve to level "A," with minimal delays. Consideration has also been given to potential impacts at the intersection of the O'Hara Avenue connector with Central Boulevard, south of Sand Creek Road Although intersection traffic impacts cannot readily be derived from the East County traffic model, overall projections suggest that a portion of the eastbound Sand Creek Road traffic would use the O'Hara connector to access downtown Brentwood. The expected volumes are such that, with the planned four-way stop sign controls, this intersection would experience congested operations. this could be a potentially significant impact, although traffic projections for this intersection are tenuous based on the extrapolation from regional traffic model information Another potential traffic impact would be future intersection baseline conditions at the Fairview Road/Sand Creek Road intersection. ,Although the future baseline intersection LOS has been estimated as "A." the heavy eastbound right-turn movements and northbound left-turn movements could result in queuing problems during peak hour conditions. This impact could be significant. Indirect impacts of the proposed roadway extension would include additional traffic diverted to Central Boulevard and Dainty Avenue during the p.m. period, The combined volumes on both roads are expected to be approximately 600 vehicles during the p.m. peak hour in the year 2010. The 800 p.m. peak hour vehicles diverted from Sand Creek would significantly impact traffic flows on both Central Boulevard and Dainty Avenue. Peak hour volumes on Central Avenue would more than double, resulting in potential congestion problems along both roadways. The intersections along both roads (particularly the stop sign controlled intersections of Central/Dainty, Central Griffith, Central O'Hara and Second/Second) could be impacted. The Central Avenue/O'Hara Avenue is planned to have a four-way stop sign in the future. The following mitigation measure is recommended to reduce future traffic impacts to a less-than-significant level: 1, City of Brentwood Page 54 Initial Study/Sand Cr iek Road Extension April 2000 • Electrical and natural gas power: Pacific Gas and Electric Co. • Communications: Pacific Bell and TCI Cable Water supply and sewage treatment: City of Brentwood • Storm drainage: City of Brentwood and Contra Costa County Flood Control District • Solid waste disposal: City of Brentwood Environmental Impacts and Mitigation Measures a, e) Exceed wasteivater treatment requirements of the RWQCB2 NI. The proposed project would not generate any wastewater flows to the regional wastewater plant, so no impact would result. b, d) Require new water or wastewater treatment facilities or expansion of existing facilities? LSI. The proposed project would not require new sources of water or cause the expansion of the City's wastewater treatment plant since it involves a roadway extension and upgraded storm drain facility. However, extension of City water and sewer lines would occur within the Sand Creek Road right-of-way , however, these facilities are included within the City's utility master plans and less-than-.significant impacts are anticipated. c) Require netiv stone drainage facilities? LS. The project includes construction of new storm drain inlets into adjacent creeks-one into Sand Creek and one in Marsh Creek. The amount of additional stormwater•entering the creek system has been accounted for by the City of Brentwood and Contra Costa County Flood Control District and is considered less-than- signilicant.. 1. g) Solid waste disposal? LS. The proposed project would incrementally increase generation of solid waste, primarily during the construction phase. This amount of solid waste is unknown, but is anticipated to be less-than-significant. Over the long term, the project should have no impact to the generation of solid waste, since the project itself would not be occupied by people or have any aspect that would generate solid waste material. XV. Mandatory Findings of Significance a) Does they project have the potential to degrade the quality of the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, reduce the number of or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California histoi), or prehistory? No. The preceding analysis indicates that the proposed project will not have a significant adverse impact on overall environmental quality, including biological resources, traffic, recreational facilities, noise or cultural resources with the implementation of mitigation measures recommended in the Initial Study. City of Brentwood Page 56 Initial Study/Sand Creek Road Extension April 2000 b) Does the project have impacts that are individually limited, but cumulatively considerable? ("Cumulatively considerable" means that the incremental effects of a project are considerable when viewed in connection with the effects of past projects, the effects of other current projects and the effects of probable future projects). No, although incremental increases in certain areas can be expected as a result of constructing this project. including additional traffic, air emissions, light and glare, the project has been included as a part of y the City's General Plan and the long-term cumulative impacts were previously addressed in the City's General Plan EIR, certifies in 1993. c) Does the project have environmental effects which will cause substantial adverse effects on human beings, either directly or indirectlY No. No such impacts have been discovered in the course of preparing this Initial Study. City of Brentwood Page 57 Initial Study/Sand Creek Road Extension April 2000 I. i Initial Study Preparers i Jerry Haag,project manager and principal author George Nickelson, traffic impacts Michael Toy, Charles Salter Associates, acoustics James Martin, biological resources Andrew Leahy, hydrology and water quality Jane Maxwell, graphics. Agencies and Organizations Consulted The following agencies and organizations were contacted in the course of this Initial Study: City of Brentwood John Stevenson, P.E., City Engineer Stephanie Gronlund, P.E., Project Manager (Sand Creek Road) Lynne Filson, P.E. Assistant City Engineer/Traffic Engineer Jeff Zilrn, Associate Planner Contra Costa County Flood Control District Neil Leary, Flood Control Engineer Sacramento Regional Water Quality Control Board Grey Vaughn California Department of Fish and Game John Waithman, Environmental Specialist U.S. Army Corps of Engineers Nancy Haley, Environmental Specialist U. S. Fish and Wildlife Service Sheila Larsen References City of Brentwood, 1993, General Plan, t Citr of Diemwood, 1993, General Plan EIR. California Burrowing Owl Consortium, 1993, Burrowing Owl Survey Protocol and Mitl,SItitlon Guidelines. City of Brentwood'. Page 58 Initial Study/Sand Creek Road Extension April 2000 I California Department of Fish and Game, 1990, Survey Methodologies for San Joaquin Kit Fox and Other Species. California Department of Fish and Game, 1999, Natural Diversity Data Base, Special Animals. California Department of Fish and Game, 1999, Natural Diversity Data Base, Special Plants. California Native Plant Society, 1994, Inventory of Rare and Endangered Vascular Plants of California, Special Publication No. 1 (5th Edition). California Native Plant Society, 1988. Terrestrial Vegetation of California. Sawyer, John O. and Todd Keeler-Wolf, 1995, A Manual of California Vegetation. California Native Plant Society. Hall, E.R.. 1981, The Mammals of North America, University of California Press, Berkeley. Holland, Robert, Natural Diversity Data Base, 1986, Preliminan_- Descriptions of the Terrestrial Natural Coniriiunities of California. Jones & Stokes Associates, Inc., 1990, Los Vaqueros, Draft Environmental Impact Report, Vasco Road and Utility Relocation Project, prepared for Contra Costa Water District, February. Morrell, S.H., 1972, Life Hi.stor_y of the San Joaquin Kit Fox, California Fish and Game Journal 58(3): 162-174. Morrell, S.H., 1975, San Joaquiir Kit Fox Distribution and .Abundance in 1975. Administrative Report 75-3, California Department of Fish and Game, Wildlife Management Branch. MUnZ. P. and D. Keck. 1973. A California Flora and Supplement, Conibined Edition. Berkeley: University of California Press. Orloff, S., L. Spiegel and F. Hall, 1986, Distribution and Habitat Requirements of the San Joaquin kit fox in the Northern Extreme oj'its Range. Western Section Wildlife Society (CAL-NEV) Conference Transactions 22:60-70. Peterson, R.T., 1969, Field Guide to Western Birds. Stebbins, R.C., 1985,A Field Guide to Westerli Reptiles and Amphibians. U.S. Fish and Wildlife Service, 1989, Standardized Recommendations for Protection of the Sart Joaquin Kit Fox, April. U.S. Fish and Wildlife Service, 1990. San Joaquin Kit Fox Range Map. U.S. Fish and Wildlife Service, 1997. San Joaquiir Kit FO.0 .81111-el' PI"OIOCOI l0l" the :Northern Range. City of Brentwood Page 59 Initial Study/Sand Creek Road Extension April 2000 U.S. Fish and Wildlife Service, 1998, Spa-L Project Site, Contra Costa County, Refer #1-1-98-TA-1182, letter to Geoff Monk, dated 26 June. City of Brentwood Page 60 Initial Study/Sand Creek Road Extension April 2000 CALIFORNIA ENVIRONMENTAL QUALITY ACT NOTICE OF DETERMINATION CONTRA COSTA COUNTY COMMUNITY DEVELOPMENT DEPARTMENT 651 PINE STREET 4TH FLOOR NORTH WING MARTINEZ, CALIFORNIA 94553-0095 Telephone: (925) 313-2296 Contact Person: Cece Sellgren, Environmental Planner Project Description, Common Name (if any) and Location: Flood Control District Real Property Transactions associated with City of Brentwood Mitigated Negative Declaration for the Sand Creek Road Extension. In April of 2000, the City of Brentwood published the Mitigated Negative Declaration. The Brentwood City Council adopted the Mitigated Negative Declaration on May 23, 2000. The Contra Costa County Board of Supervisors is adopting the City of Brentwood's Mitigated Negative Declaration to address the necessary Flood Control District real property transactions associated with the project. Contra Costa County Flood Control and Water Conservation District wishes to exchange right-of-way it currently owns on Sand Creek Road with an equivalent area of right-of-way held by the City of Brentwood in the Sand Creek Channel. The areas are each approximately 0.3 acres in size and are located west of the intersection of Sand Creek Road and Fairview Avenue. In addition,Contra Costa County Flood Control and Water Conservation District wishes to quitclaim to the City of Brentwood portions of Sand Creek and old Sand Creek Road, which include approximately 0.3 acres on the west side of Fairview Avenue and approximately 0.3 acres on the east side of Fairview Avenue. The District reserves flowage and access easements on this area. Project Location: The proposed project is located near the intersection of Fairview Avenue and Old Sand Creek Road in the Brentwood Area of East County. Pursuant to the provisions of the California Environmental Quality Act: ( ) An Environmental Impact Report was prepared and certified (SCH # ) ( ) The Project was encompassed by an Environmental Impact Report previously prepared for (SCH # ). ( X ) A Mitigated Negative Declaration was prepared following identification of a potentially significant impact. The Mitigated Neg Dec (certified by the City of Brentwood) is being adopted by the Board of Supervisors Copies of the record of project approval and the Negative Declaration or the final EIR may be examined at the office of the Contra Costa County Community Development Department. ( X ) The City of Brentwood determined the project will not have a significant environmental effect with the incorporation of mitigation into the project description. The Board of Supervisors is adopting the certified Mitigated Neg Dec. ( ) The Project will have a significant environmental effect. ( ) Mitigation measures were made a condition of approval of the project. ( ) A statement of overriding considerations was adopted. ( ) Findings were adopted pursuant to Section 15091 of the State CEQA Guidelines. Date: By: Community Development Department Representative AFFIDAVIT OF FILING AND POSTING I declare that on I received and posted this notice as required by California Public Resources Code Section 21152(c). Said notice will remain posted for 30 days from the filing date. Signature Title Applicant: Department of Fish and Game Fees Due Contra Costa County Public Works Dept. EIR- $850 Total Due: $ 255 Glacier Drive Neg. Dec. - $1,250 Total Paid $ Martinez, CA 94553 DeMinimis Findings - $0 Attn: Trina Torres _X_ County Clerk-$50 Receipt#: G:\GrpData\EngSvc\ENVIRO\2001 projects\CEQA only\NOD\Sand Creek Road Extension-Acquisition of two parcels.doc RESOLUTION NO. 2081 A RESOLUTION OF THE CITY COUNCIL OF TTIZ CITY OF BRENTWOOD ADOPTING A MITIGATED NEGATIVE DECLARATION AND MITIGATION MONITORING AND REPORTING PROGRAM FOR THE SAND CREEK ROADWAY PROJECT, CIP No. 336-3061 WHEREAS, the Brentwood Gendral Plart Circulation Policy Number 1.1 states that the City should "implement the improvements in the Circulation System Map'; and WEIEREAS, the Brentwood General Plan 'Conservation/Open Space Policy Number 7.2.1 states the City should "encourage new development to consider effects on the ecosystem in their plan and propose mitigation to potential effects on the biological environment'; and WHERE,AS, the Sand Creek Road Project is-consistent with the Circulation Plan of the Brentwood General Plan;and WELEREAS, the Initial Study relies on impact analysis and mitigation measures contained in the environmental Impact Report certified in 1993 (State Clearinghouse No. 92063113) which was prepared to assess impacts associated with the adoption of the Brentwood General Plan; and WHEREAS, a Mitigated Negative Declaration ("MND")lias been prepared, publicized; circulated and reviewed in accordance with the California Environmental Quality Act(Cal. Pub: Res. Code sections 21000 et seg., "CEQA") and the State CEQA guidelines (Cal. Code Regs, Title 17, sections 15000 e1 seq., "CEQA Guidelines');and WHERE,AS, the City,has reviewed and considered the verbal and written infornnation provided by interested parties as well as the information provided in the Initial Study/Mitigated Negative Declaration("MND'). 7]ie MND reflects the Council's independent judgement;and WHEREAS, the mitigation measures listed in the MND shall be made conditions of project approval to ensure that the project will not have significant effect on the envitonmenL A . Mitigation Monitoring and Reporting Program has also been prepared in accordance with CEQA and Implementing Guidelines. NOW,THE,REFORE, BE IT RESOLVED by the City Council of Brentwood that the. City hereby adopts the MND and associated Mitigation Monitoring and Reporting Program'as. complete,adequate and in compliance with CEQA. PASSED by the City Council of the City of Brentwood at a regular meeting on the 23'1i, day of May 2000 by the following vote: AYES: Councilmembers Gomes,McPoland, Petrovich,Mayor Kidd [NOES: None ABSENT: Councilmember Young Ile 4a�iwn&tjin L.Kidd yor ATTEST. en biaz,CMC City Clerk RESOLUTION NO. 2081 A RESOLUTION OF THE CITY COUNCIL OF TIME CITY OF BRENTWOOD ADOPTING A MITIGATED NEGATIVE DECLARATION AND MITIGATION MONITORING AND REPORTING PROGRAM FOR TIME SAND CREEK ROADWAY PROJECT, CII' No. 336-3061 Y4U-REAS, the Brentwood General Plan Circulation Policy Number 1.1 states that the City should "implement the improvements in the Circulation System Map'; and WIXERE AS, the Brentwood General Plan Conservation/Open Space Policy Number 7.2.1 states the City should "encourage new devclopment to consider effects on the ecosystem in their plan and propose mitigation to potential effects on the biological environment"; and WHEREAS, the Sand Creek Road Project is-consistent with the Circulation Plan ofthe Brentwood General Plan;and WE[EREAS, the Initial Study relies on impact analysis and mitigation measures contained in the environmental Impact Report certified in 1993 (State Clearinghouse •No. 92063113) whicli was prepared to assess impacts associated with the adoption of the Brentwood General Plan; and WHE,REAS, a Mitigated Negative Declaration ("MND")has been prepared, publicized; circulated and reviewed in accordance*ith the California Environmental Quality Act(Cal.Pub: Res. Code sections 21000 et seq., "CEQA") and the State CEQA guidelines (Cal. Code Regs, Title 17,sections 15000 e[seq.,"CEQA Guidelines');and WHERE , the City has reviewed and considered the verbal-aud written information provided by interested parties as well as the information provided in the initial Study/Mitigated Negative Declaration("MND"). The MND reflects the Council's independent judgement;and WI , the mitigation measures listed in the MND shall be made conditions of project Approval to ensure that the project will not Have significant effect on the environment A . Mitigation Monitoring and Reporting Program has also been prepared in accordance with CEQA and Implementing Guidelines. NOW,THEREFORE, BE IT RESOLVED by the City Council of Brentwood that the City hereby adopts the MND and associated Mitigation Monitoring and Reporting Program'as complete,adequate and in compliance with CEQA. 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