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Home My WebLink AboutMINUTES - 09142004 - C128 TO: BOARD OF SUPERVISORS Contra FROM: DENNIS M.BARRY,AICP "• Costa COMMUNITY DEVELOPMENT DIRECTOR clat Coumy DATE: SEPTEMBER 14,2004 SUBJECT: APPROVAL, OF THE ADDENDUM TO THE MITIGATED NEGATIVE DECLARATION FOR THE IRON HORSE TRAIL OVERCROSSING OF TREAT BOULEVARD AND THE OAK ROAD RIGHT- TURN LANE PROJECT, PLEASANT HILL BART STATION AREA,WALNUT CREEK SPECIFIC REQUEST(S)OR RECOMMENDATIONS(S)&BACKGROUND AND JUSTIFICATION RECOMMENDATIONS APPROVE the Addendum to the Mitigated Negative Declaration for the Treat Boulevard/Jones Road(Iron Horse Trail)overcrossng and the right turn lane on Oak Road to Treat Boulevard). DIRECT the Redevelopment Director to file a Notice of Determination with the County Clerk and pay the$25.00 handling fee to the County Clerk. AUTHORIZE the Public Works Director to proceed with property acquisition necessary for the project. FISCAL>IMPACT No General Funds are involved.The project is fully funded by a federal transportation grant($5170,000),Measure C funds($1.1 million),traffic impact fees($2.4 million),and Redevelopment Agency funds($1.5 million).All funding is reflected in the Agency's adopted budget. i CONTINUED ON ATTACHMENT: X YES SIGNATURE 'S RECOMMENDATION OF COUNTY ADMINISTRATOR RECD ME, ATIONOARD COM =APPROVE OTH f' SIGNATURE (S): f 7 ACTION OF BOARD O� r�.�l� %� �'� PPROVED AS REC M ENDED IOTHER VOTE OF SUPERVISORS I HEREBY CERTIFY THAT THIS IS A TRUE ZUNANIMOUS(ABSENT U;�v_) AND CORRECT COPY OF AN ACTION AYES: NOES: TAKEN AND ENTERED ON THE MINUTES ABSENT: ABSTAIN: OF THE BOARD OF SUPERVISORS ON THE DATE SHOWN Contact: Maureen Toms, Community Development- 335- ATT�ST ; 1250 ?"'S ' JOHN SWEETEN, CLERk OF THE BOARD cc: Redevelopment Agency OF SUPERVISORS AND COUNTY Public Works Department-Design Division ADMININISTRATOA Public Works Department-Real Property Division County Administrator CountyCounsel BY , DEPUTY ......... ......... ......... .1111 ......... .._..._...... .._._..... ......... ......... ......... ......... ........ ......... ......... ......... .............._.. ......... _....... ......... Board of Supervisors September 14,2004 Ironhorse Trail Overcrossing Page 2 BACKGROUND/REASONS FOR RECOMMENDATIONS The Ironhorse Trail Overcrossing was approved by the Board of Supervisors on June 10, 2003. The Board approved the project,subject to the Public Works Director returning to the Board of Supervisors for the approval ofplans and authorization to advertise for bids. This modification was to allow staff to continue to work with the Central Contra Costa unitary District to address issues related impacts to the sewer line and easement in Jones Road. In addition, staff is continuing to work with John Muir Mt. Diablo Health Systems(JMMDHS)and its representatives in addressing JMMDHS concerns regarding the aesthetics and proximity to the JMMDHS building. The final design of the project requires a slight realignment to the east on the north side of Treat Blvd. This realignment requires the acquisition of approximately 10 sq. ft. of right-of-way from the La Morte Property, currently occupied by the Muller Veterinary Hospital. Approximately 475 sq. ft. is also needed for an access easement for construction and maintenance activities. The property was once part of the public right-of-way,but later vacated. Although the bridge structure will not be constructed on the property,an elevated portion of the bridge will encroach over the existing property line. An easement encompassing a larger area of the property will also be necessary for construction/maintenance activities. The realignment of the overcrossing in this area is required to address concerns of Central Contra Costa Sanitation .District related to relative proximity of overcrossing supports to their underground trunk lines. CONSEQUENCE OF NEGATIVE ACTION. Due to the physical constraints of the area,including underground utilities,the bridge would not be constructed. ADDENDUM to the MITIGATED NEGATIVE DECLARATION ADOPTED FOR THE TREAT BOULEVARD/JONES ROAD (IRON HORSE TRAIL) OVERCRGSSING AND THE RIGHT TURN LANE ON OAK ROAD TO TREAT BOULEVARD Prepared by. Maureen'Toms, AICD, Principal Planner Contra Costa County Community Development Department 651 Pine Street Martinez, CA 945534897 August 30, 2004 Approved by: Maureen Toms, J?rAncilial Planner Printed Name Aytgust.30. 2Q(4 Date 1 ----.................................................................................................................................................................................................................... . .. ...... .............................. .. ADDENDUM to the MITIGATED NEGATIVE DECLARATION ADOPTED FOR THE: TREAT BOULEVARD/JONES ROAD (IRON HORSE TRAIL)OVERCROSSING AND THE RIGHT TURN LANE ON OAK ROAD TO TREAT BOULEVARD PREFACE The Mitigated Negative Declaration evaluated the proposed the proposed project involves the construction of a Class I Bicycle/pedestrian Bridge with ramps over Treat Boulevard at the intersection with Jones Road. Existing temporary BART parking on the north end of the overcrossing and the Jones Road northbound right turn lane to Treat Boulevard would be removed. The alignment within the northbound right turn lane provides separation from the John Muir/Mt. Diablo Health Systems facility and preserves a stand of mature trees along Jones Road. Landing ramps would be constructed on Jones Road. The bridge overcrossing would connect with a realigned portion of the Iron Horse Trail on the north end and the existing trail alignment on the south end.A northbound right turn lane on Oak Road,located one block west of Jones Road,would be constructed to replace the dedicated right turn lane used to construct the overcrossing right ofway on Jones Road. This document serves as the Addendum to the Mitinted Negative Declaration for the Treat Boulevard/Jones Road(Iron Horse Trail)overcrossing and the right turn lane on Oak Road to Treat Boulevard). Consequently, the Mitigated Negative Declaration for the project consists of the original Mitigated Negative Declaration and this Addendum. The Contra Costa Community Development Department(CDD)is the lead agency for the project, and on June 10, 2003, the Board of Supervisors approved the project and filed a Notice of Determination with the County Clerk. The Board determined that the project would not have a significant effect on the environment CEQA PROCESS The California Environmental Quality Act(CEQA)prescribes that an Addendum(CEQA Guidelines Section 15164)to a previously adopted Mitigated Negative Declaration shall be prepared by either the lead agency or the responsible agency if some minor technical changes or additions are necessary but none of the conditions described in CEQA Guidelines Section 15162 have occurred: 1. No substantial changes have occurred which will introduce new significant environmental effects not previously considered or a substantial increase in the 2 _....... ......... ......... ......... ......... ......... ................111.1. __ ....... .............. . ......... ........... ......... ......... ......... ......... ........ ......... ......... ......1111 ._....... ......... ......... ......... severity of previously identified significant effects, 2. No substantial changes to the conditions or circumstances in the area affected by the project have occurred, or 3. No new information of substantial importance shows that significant impacts previously examined will be substantially more severe than shown in the previous Negative Declaration or the project will have one or more significant effects not previously discussed. In addition, there is no new information showing that mitigation measures or project alternatives which were previously determined to be infeasible would actually be feasible and would substantially reduce significant effects of the project, and there is no such new information suggesting that new mitigation measures or alternatives which are considerably different from those analyzed in the previous Negative Declaration would substantially reduce one or more significant effects on the environment. In accordance with CEQA Guidelines Section 15164(d), the County Board of Supervisors shall consider Addendum along with the Mitigated Negative Declaration prior to making a decision on the project. According to CEQA Guidelines Section 15164 (c) an Addendum does not require circulation for public review but can be included in or attached to the Mitigated Negative Declaration. As noted in the Preface, the Addendum is attached to the Mitigated Negative Declaration for the project. EXPLANATION OF ADDENDUM The Addendum to the Mitigated Negative Declaration for the Treat Boulevard/Jones Road(Iron Horse Trail) overcrossing_and the right turn lane on Oak Road to Treat Boulevard) identifies revisions to the plan,including the acquisition of approximately 10 sq.ft.of property at the northern end of the bridge landing. Although the bridge structure will not be constructed on the property,an elevated portion of the bridge will encroach over the existing property line.An access easement of up to 475 sq. ft. is also needed for construction and maintenance purposes. The acquisition of the property, which was 'formerly public right-of-way will not impact the business' parking lot or landscape improvements. The Addendum is consistent with County policies and does not lead directly or indirectly to significant physical changes in the project,nor does it alter the adequacy or the completeness of the environmental impacts identified in the Mitigated Negative Declaration.Therefore,the Addendum to the Mitigated Negative.Declaration is appropriate. ADDITION TO THE NEGATIVE DECLARATION This section identifies the language which is added/or changed (bald face type) or deleted (stilt)to the text and figures'ofthe Negative Declaration: p. 1, item 8. Project Description: The proposed project involves the construction of a Class I 3 ......... ......... ......... ......... ........- ..-_..._. ... ......... ......... .......... ....... ......... ......... ......... ......... ....... ......... ......... ......... ......... ......... ....................................... .. ....................................................................... Bicycle/pedestrian Bridge with ramps over Treat Boulevard at the intersection with Jones Road. Existing temporary BART parking on the north end of the overcrossing and the Jones Road northbound right turn lane to Treat Boulevard would be removed. The alignment within the northbound right turn lane provides separation from the John MuirlMt.Diablo Health Systems facility and preserves a stand of mature trees along Jones Road. Landing ramps would be constructed on Jones Road. Acquisition of approximately 10 sq.ft.of right-of-way from the La Morte Property, currently occupied by the Muller Veterinary Hospital, is needed at the northern section of the bridge. Approximately 475 sq.ft.is also needed for an access easement for construction and maintenance purposes. The bridge overcrossing wouldconnect with a realigned portion of the Iron Horse Trail on the north end and the existing trail alignment on the south end.A northbound right turn lane on Oak Road,located one block west of Jones Road,would be constructed to replace the dedicated right turn lane used to construct the overcrossing right of way on Janes Read. p.14,item IX. LAND USE AND PLANNING, SUMMARY,Paragraph 1: The proposed project required the acquisition of approximately IO sq,. ft. of right-of-way from the La Morte Property, currently occupied by the Muller Veterinary Hospital, is needed at the northern section of the bridge. Approximately 475 sq. ft. is also needed for an access easement for construction and maintenance. The property needed was previously public right-of-way, prior to the vacation to the current property owner. The acquisition will not effect the parking lot or the landscaping improvements for the business. Figures: Add Figure 4-La Morte Property Corner 4 Figure 4- La Morte Property Corner € r L t `* 120.7' rt M PH Fl Fv-=133.2- t to - + e � ;� +� • { � A ; 8z VAUL-13w ` ( r 0j,fl MON al NO cr O LL N01 1 #— PARKING 1 1i F. -SIGN I _6 /L101-iTING, flox 1 �`• a..r• NF1 A1v1 �f,1"' S� �'' ',+ stir • `�,�.,, !� '.. ��.r--- VAULT �'x!E. ICs N A i.. ,,v � _.� L€Gi1TIN fir. NO — SLAND DI IAL�jLIfjT}�a,; C tis IAIF E iW CL tls , G56 ST6 XVd CV:$T o�9Zt8{? ......... ......... ......... ......... _ ...... .............. ._.....__. ...._.................... ........... ......_.. ......... ......... ......... ......... .............................. -Community Contra Dennis it Barry, AICP Community Development director Development Cost. Department County County Administration BuildingE Attachment F 651 Pine Street 4th f=loor,North Wing ` Martinez,California 94553-0095 ��~~ Phone: (925)335-1250 t',�,..-.-. March 17,2003�•: NOTICE OF PUBLIC REVIEW AND INTENT To ADOPT A PROPOSED MITIGATED NEGATIVE DECLARATION County File#CP 03-18 Treat Boulevard/Jones Road(Iron Horse Trail) Overcrossing and the Right Turn Lane on Oak Road to Treat Boulevard. Pursuant to the State of California Public Resources Code and the"Guidelines for Implementation of the California Environmental Quality Act of 1970" as amended to date, this is to advise you that the Community Development Department of Contra Costa County has prepared an initial study on the following project: CONTRA COSTA COUNTY (Applicant & Owner), County File#CP03-18: The proposed project involves the construction of a Class I Bicycle/pedestrian Bridge with ramps over Treat Boulevard at the intersection with Jones Road. Existing temporary BART parking on the north end of the overcrossing and the Jones Road northbound right turn lane to Treat Boulevard would be removed. The alignment within the northbound right turn lane provides separation from the John Muir Diablo Health Systems facility and preserves a stand of mature trees along Jones Road. Landing ramps would be constructed on Jones Road. The bridge overcrossing would connect with a realigned portion of the iron Horse Trail on the north end and the existing trail alignment on the south end.A northbound right turn lane on Oak Road,located one block west of Jones Road,would be constructed to replace the dedicated right turn lane used to construct the overcrossing right of way on Jones Road. The site is within the Pleasant Hill BART Station Specific Plan area in Central Contra Costa County. Potentially significant impacts related to aesthetics, air quality, cultural resources, geology and soils, hazards and hazardous materials,hydrology and water quality,traffic,and noise have been identified in the initial study. Mitigation measures have been incorporated which reduce these impacts to an insignificant level. A copy of the Mitigated Negative Declaration and all documents referenced be reviewed in the offices of the Community Development Department,and Application and Permit Center at the McBrien Administration Building,North Wing,Second Floor, 651 Pine Street,Martinez, during normal business. Public Comment Period - The period for accepting comments on the adequacy of the environmental documents extends to 5:00 P.M., Thursday,.April 17,2003. Anycomments should be in writing and submitted to the following address: Maureen Toms,Principal Planner Contra Costa County Community Development Department 651 Pine Street,North Wing,4th Floor Martinez,CA 94553 It is anticipated that the proposed Mitigated Negative Declaration will be considered for adoption at a meeting of the Contra Costa.County Planning Commission on Tuesday,April 22,2003. The meeting is anticipated to be held at 7:00 pm at the Board Chambers at 651 Pine Street, Martinez,CA. It is expected that the Planning Commission will also conduct a hearing on the application at the same meeting. Interested parties may contact staff at the above number to confirm the time and date of the hearing. Maureen Toms,AICD Principal Planner Office Hours Monday - Friday:8:00 a.m.- 5:00 p.m. _...... _................... . _ . .... ....... .............. ...._..... ......... .... ._. . _..._. ............_.._. __ ..... ......... ........_. ..._..... ........................ .. ............................................ 1 Environmental Checklist Form l. Project Title: Treat Boulevard/Jones Road (Iron Horse Trail) Overcrossing and the Right Turn Lane on Oak Road to Treat Boulevard, 2. Lead Agency Name and Address: Contra Costa County Community Development Department 651 Pine Street,North Wing-4th Floor Martinez, CA 94553 3. Contact Person.and Phone Number: Maureen Toms (925)335-1250 4. Project Location: The project site for the overcrossing is located along Jones Road and the site for the northbound right'-turn lane onto Treat Blvd. is Oak Road at Treat Blvd., near the Pleasant Hill BART Station, in the unincorporated area of Central Contra Costa County. The project site is within the area of the Pleasant Hill BART Station Area Specific Plan. 5. Project Sponsor's Name and Address: Contra Costa County Redevelopment Agency 651 Pine Street,e Floor-North Wing Martinez,CA 94553 6. General Plan Designation: Public/Semi Public(P/S)and Office(OF) 7. Zoning: Planned-Unit District(P-1) 8. Description of Project: The proposed project involves the construction of a Class l Bicycle/pedestrian Bridge with ramps over Treat Boulevard at the intersection with Jones Road. Existing temporary BART parking on the north end of the overcrossing and the Jones Road northbound right turn lane to Treat Boulevard would be removed. The alignment within the northbound right tum lane provides separation from the John Muir Diablo Health Systems facility and preserves a stand of mature trees along Jones Road. Landing ramps would be constructed on Jones Road. The bridge overcrossing would connect with a realigned portion of the Iron Horse Trail on the north end and the existing trail alignment on the south end. A northbound right turn lane on Oak Road, located one block west of Janes Road, would be constructed to replace the dedicated right turn lane used to construct the overcrossing right of way on Jones Road. 9. Surrounding Land Uses and Setting: The site of the proposed bridge overcrossing is within the Pleasant Hill BART Station Specific Plan Area. Surrounding land uses include the BART Station, office and medical administration buildings, parking lot for the Muller Veterinary Hospital,temporary BART parking lot, and the Renaissance Hotel and Health Club complex. The ,111.......................................................-.................................................I.............. ...........................- .......... .....................................................................................................-........................... ........................... 2 1-680 freeway is approximately two blocks to the west of the site. 10. Other public agencies whose approval California Department of Transportation(CALTRANS), is required(e.g.,permits,financing Federal Highway Administration(FHWA), and East Bay approval, or participation agreement): Regional Park District(EBRPD). 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. — Land Use and Planning ✓ Transportation/ Public Services — Population&Housing Circulation Utilities& Service ✓ Geological Problems ✓ Biological Resources Systems ✓ Water Energy & Mineral ✓ Aesthetics ✓ Air Quality Resources ✓ Cultural Resources ✓ Mandatory Findings of ✓ Hazards Recreation Significance ✓ Noise DETERMINATION 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. ✓ 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 MITIGATED NEGATIVE DECLARATION will be prepared. I find that the proposed project MAY have a significant effect on the environment, and an ENVIRONMENTAL IMPACT REPORT is required. I find that the proposed project MAY have a significant effect(s)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 the earlier analysis as described on attached sheets, if the effect is a "potentially significant impact" or "potentially significant unless mitigated." An ENVIRONMENTAL IMPACT REPORT is required,but it must analyze only 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 upon the proposed project. 11 _........ .........._... .. ..._._. .. ....... .... ........... _.._................_.._... .......... ......_.. ......__. _....... ......... ...._._.. _. ....... _ _. . _. _........._ .......... 3 Prepared by: March 17, 2003 Booker Holton,PhD. Date Approved by: / March 17, 2003 Maureen Toms,AICD Date CCC Community Development Department CALIFORNIA ENVIRONMENTAL QUALITY ACT The Environmental Impact Report for the Amendments to the Pleasant Hill BART Station AreaSpecific Plan (certified on October 6, 1998)is a program EIR prepared in accordance with Section 15168 of the California Environmental Act(CEQA)Guidelines. CEQA enables the EIR to serve as a tiering document for individual development projects proposed for the Specific Plan area. The program ETR addressed all of significant cumulative impacts of the amendments to the Specific Plan. Subsequent activities(i.e.,development plans)in the program (specific plan) must be examined in the light of the program EIR to determine whether an additional environmental document must be prepared. if a later activity would have effects that were not examined in the program ETR, a new Initial Study would need to be prepared leading either to a Negative Declaration or EIR. The EIR included the evaluation of a project to provide access between the East Bay Regional Park District's (EBRPD)Iron Horse Trail and the Specific Plan area,including a pedestrian crossing in the vicinity ofJones Road,at the signalized crossing. An overpass at Treat Boulevard that would meet Americans with Disabilities Act(ADA)requirements was considered and provided for in the Specific Plan. The EIR for the Specific Plan found potentially significant impacts and provided mitigation measures that would reduce these impacts to'a less than significant level. These mitigation measures are incorporated into the proposed Iron Horse Trail Overcrossing project and are identified with an asterisk in the document(i.e., Mitigation Measure*). The proposed project does not result in additional significant environmental impacts that were not already evaluated by the County in that EIR. Project specific mitigation measures,which reduce potential impacts to an insignificant level,are also incorporated into the project. SOURCES In the process of preparing the Checklist and conducting the evaluation,the following references(which are available for review at the Contra Costa County Community Development Department,651 Pine Street 5th Floor-North ting,Martinez)were consulted: 1. The(Reconsolidated)County General Plan(July 1996)and EIR on the General Plan(January 199 1) 2. Pleasant Hill BART Station Area Specific Plan and BIR(October 1998) 3. Iron Horse Trail Bicycle/Pedestrian Overcrossing Traffic Study(March 2002) 4. Pleasant Hill BART Pedestrian/Bicycle Overcrossing Community Design Program,Feasibility Study Report(December 1,2000) 5. Phase I Environmental Site Assessment Report—Iron Horse Trail Crossing(July 30 200 1) 6. Northwest Information Center Records Search Results for the Iron Horse Trail Overcrossing--May _._...... ......... ......... .. ......... ......... _.... ......... ......... ......... ........ ......... ......... ........................ ......._. ......... ._._........._......... ....... .._.. ....... 4 31, 2001 EVALUATION OF ENVIRONMENTAL IMPACTS: Potentially significant Impact, Potentially Unless Less than significant Mitigation Significant Impact Incorporated Impact No Impact I. AESTHETICS. Would the proposal: a. Have a substantial adverse effect on a scenic vista? (Source 2,4) b. Substantially damage scenic resources, _ including, but not limited to, trees, rock outcroppings,and historic buildings within a state scenic highway?(Source 2,4) C. Substantially degrade the existing visual character or quality of the site and its surroundings? (Source 2,4) d. Create a new source of substantial light or ✓ glare, which would adversely affect day or nighttime views in the area?(Source 2,4) SUMMARY: The proposed Iron Horse Trail overcrossing area is located northeast and southeast of the intersection of Treat Boulevard and Jones Road. The overcrossing would intersect Treat Boulevard and extend approximately 300 feet north and 300 feet south of Treat Boulevard.Two bridge design concepts--a railroad truss and a cable stay system,along with two options,a low profile arch bridge supported by cables and a pre- engineered structure -- are being considered. The bridge structure over Treat Boulevard requires a 16-foot clearance and a maximum 5-percent slope to be compliant with Americans with Disabilities Act(ADA) requirements of public facilities for the disabled. The Specific Plan provides for a community based design process for the overcrossing. During various community meetings convened by the Contra Costa County Redevelopment Agency,the public expressed,a range of opinions about the compatibility ofdesign alternatives with the surrounding neighborhood. In addition,the County conducted a survey in January and February 2003, where the four design options were available for review on the County's website. Members of the public were invited to vote on their preferred design option. Some landscape trees will be removed as part of the construction of the right-tum lane on Oak Road. The street trees will be replaced as part of the project(see Mitigation Measure#IVe). Lmpact lc): The proposed project has the potential to be insensitive to the aesthetics of the surrounding areas. Mitigation Measure(I c):The Specific Plan.Policy 2,Bicycle and Pedestrian Circulation,provides a process that would minimize the potential aesthetic effects of the pedestrian/bicycle bridge overcrossing. "A pedestrian and bicycle over should be provided at Jones Road for the Iran Horse Trail,provided that the County Board of Supervisors, in approving the project _...... ......... ......... ....._. .. ...__ ...................._... .......... ._..._..... ......... ......... ......... ....._._. _ _ _.... _.... ..._ _................... . ....................................... 5 determine that, among other requirements, the form, height, mass, and setback of the Iron Horse Trail overcrossing is aesthetically and functionally consistent with its proximity to the existing office building at 1400 Treat Boulevard. The convenience of pedestrian access to this 'building and the Treat Boulevard frontage shall also be provided for in the design of the overpass. Location and design of the bridge shall be reviewed and approved by the County Planning Commission after a public hearing." Regardless of the ultimate design selected,due to safety concerns,it is very probable that the bridge and areas underneath the structure would be illuminated at night.The importance of a well-lit environment may conflict with the community desires to minimize the visual intrusion of night illumination. act l d : For pedestrian and bicycle safety additional exterior lighting maybe incorporated into the overcrossing bridge design,which may result in intrusive light and glare to passing motorist and surrounding offices and fixture land uses proposed for The Specific Plan Area. The following mitigation measures will be incorporated into the proposed project: Mtigxation Measure*(l d): 30 days prior to the issuance of a construction permit,the applicant shall submit for review and approval of the Zoning Administrator a Lighting Plan. Light standards shall be low-lying.Exterior lights on the bridge shall be deflected so that light shines onto the bridge platform or access ramps and not toward adjacent properties or passing motorists. Irnplementation of this mitigation measure will reduce this impact to less than significant. Potentially significant Impact, Potentially Unless Less than significant Mitigation Significant Impact Incorporated Impact No Impact II. AGRICULTURAL RESOURCES: In determining whether impacts to agricultural resources are significant environmental effects,lead agencies may refer to the California Agricultural Land Evaluation and Site Assessment Model (1997) prepared by the California Dept.Of Conservation as an optional model to use in assessing impacts on agricultural and farmland. Would the project. a. Convert Prime Farmland,Unique Farmland or ✓ Farmland or Statewide Importance (Farmland), as shown on the maps prepared pursuant to the Farmland Mapping and Monitoring Program of the California Resources Agency, to non-agricultural use? (Source 2) b. Conflict with existing zoning for agricultural ✓ use,or a Williamson Act contract?(Source 2) C. Involve other changes in the existing _ _ ✓ environment, which, clue to their location or ........ ...... . ......... ......... ......... ......... ......... ......... ......._. ......... ._....... ....._ .. ... _ _.. ... ......... ......... ......... ......... ......... ......... ._.._... .. ....._... ......_.... .............. _... 6 nature, could result in conversion of Farmland,to non-agricultural use?(Source 2) SUMMARY: The site of the proposed footings and ramps of the Iron Horse Trail Pedestrian/Bicycle Bridge is currently within a right-turn lane of paved surface road. Since the site is not associated with any agricultural uses, the proposed use will not impact agricultural resources. Potentially significant Impact, Potentially Unless Less than significant Mitigation Significant impact Incorporated Impact No Impact III. AIR QUALITY. Where available, the significance criteria established by the applicable air quality management or air pollution control district may be relief upon to make the following determinations. Would the project: a. Conflict with or obstruct implementation of the applicable air quality plan(Source: 2) b. Violate any air quality standard or contribute to ✓ an existing or projected air quality violation? (Source 2) C, Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non-attainment under an applicable federal or state ambient air quality standard(including releasing emissions which exceed quantitative thresholds for ozone precursors)? (Source 2) d. Expose sensitive receptors to substantial ✓ pollutant concentrations?(Source 2) e. Create objectionable odors affecting a ✓ substantial number of people? (Source 2) SUMMARY: The EIR prepared for the Pleasant Hill BART Station Area adequately addressed air quality impacts resulting from proposed development of all Specific Plan Subareas,including ancillary construction such as the Iron Horse Trail Overcrossing. The following mitigation measures adopted for the Pleasant Hill BART Station Area Specific Plan will be incorporated into the proposed project: Potentially Significant Environmental Effect(IIIc). Construction activities would result in exhaust emissions and particulate. Mitigation Measures*(IIIc): During construction require implementation of BAAQMD construction dust control measures such as the following: 1. Water all active construction sites at least twice daily. 2. Water or cover stockpiles of debris,soils,sand and other materials that can be blown by the wind daily. 3. Cover all trucks hauling soils, sand and other loose material or require all material- hauling trucks to maintain at least two feet of freeboard. 4. Pave,apply water 3 times daily or apply non-toxic soil stabilizers on all unpaved access xriv. :N::N: ... ......... ......... ......... .. ................ ......... _.._..... ....._... ......... ......... ....... _ _ ........ .......... ......._....1 ....._111 7 roads,parking lots and staging areas at construction sites. 5. Sweep street daily,preferably with water sweepers,if soil is carried onto adjacent streets. Potentially significant Impact, Potentially Unless Less than significant Mitigation Significant Impact incorporated impact No impact N. BIOLOGICAL RESOURCES. Would the project: a. Have a substantial adverse effect, either ✓ directly or through habitat modifications, on any species identified as a candidate,sensitive, or special status species in local or regional plans, polices, or regulations, or by the California Department of Fish and Garvie or U.S.Fish and Wildlife Service?(Source 2) b. Have a substantial adverse effect on any _ ✓ riparian habitat or other sensitive natural community identified in local or regional plans, policies, and regulations or by the California Department of Fish and Game or US Fish and WildlifeService?(Source 2) c. Have a substantial adverse effect on federally ✓ protected wetlands as defined by Section 404 of the Clean Water Act (including, but not limited to, marsh, vernal pool, coastal, etc.) throw direct removal, filling, hydrological interruption,or other means?(Source 2) d. 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? (Source 2) e. Conflict with any local policies or ordinances ✓ protecting biological resources, such as tree preservation policy or ordinance?(Source 2) f. Conflict with any provisions of an adopted ✓ Habitat Conservation Plan, Natural Community Conservation Pian or other approved local, regional, or state habitat conservation plan?(Source 2) SUMMARY: The project site contains paved surfaces,lawns,and urban landscaping along Oak Road and Jones Road. Valuable wildlife habitat and native vegetation is absent from the site. Landscape trees are located along the east sides ofboth Oak Road and Jones Road.The alignment of the proposed Iron Horse Trail access ramps and overcrossing is proposed west of a stand of mature trees along Jones Road. The alignment would avoid the removal of trees. Trees along the east side of flak Road would be removed to construct the new right turn lane to Treat Boulevard. The Pleasant Hill BART Station Area Specific .Flan, contains a policy that relates to the ........ ......... ......... ......... ......... ......... ......... ......... .........__..... . ...__.._. . . _... ......... ......... ......... ......... ._...... ......_... ._....... landscaping in the area: "A unified street planting pattern shall be maintained for all streets as diagrammatically indicated with a formal tree planting designation in the urban Design Policy Diagram, Figure 7.4. The street tree shall be Platanus acerfolia (London Plane Tree). Other tree specimens may be appropriate far street tree use, and may be appropriate and encouraged. Spacing between trees shall be generally between 22 and 30 feet except where vehicular circulation requirements preclude it or underground utilities interfere. "(LANDSCAPING, POLICY 3). Potentials Significant Environmental Effect(IVe). Landscape trees along the east side of Oak Road would be lost. Mitigation Measures*We): Landscaping Policy 3 would direct the replacement of trees removed by the construction of the right turn lane on northbound Oak Road.Tree planting will be integrated with open space,landscaping and pedestrian circulation plans as adopted by the Specific Plan to unify the Pleasant Hill BART Station Area design. Implementation of this mitigation measure will reduce this impact to less than significant. Potentially significant Impact, Potentially Unless Less than significant Mitigation Significant Impact Incorporated Impact No Impact V. CULTURAL RESOURCES. Would the project: a. Cause a substantial adverse change in the ✓ significance of a historical resource as defined in §15064.5? (Source 2,6) b. Cause a substantial adverse change in the ✓ significance of an archaeological resource pursuant to §15064.5?(Source 2,6) C. Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature?(Source 2,6) d. Disturb any human remains, including those ✓ interred outside of formal cemeteries? (Source 2,6) SU)p IAg.Y: A review of records and literature at the NorthwestInformation Center(NIC), Sonoma State University,indicates that the proposed project area contains no recorded Native American or historic cultural resources. There is a low potential for Native American sites in the project area. Review of historical literature and maps on file with the RTIC'indicate no historic archaeological sites or historic structures in the project area. There is a low possibility of identifying historic cultural resources in the project area. If cultural resources were to be encountered during construction, the EIR for the '1998 Specific Plan Amendment adopted mitigation measures sufficient to reduce the identified impacts of future construction on cultural resources to a less-than-significant level. _........ ......... ......... ......... ..............._....111.11,11.111, ...... ........ .._........._. _............__.._..................... .........._. .. _..._.. ......... ......... ......__. ................................... 9 Potentially Significant Environmental Effect(Vb): Construction activities requiring excavations and earth movement could uncover and impact significant cultural resources. Mitigation Measures* (V!): Since the site of the proposed Iron Horse Trail Overcrossing is covered with pavement obscuring the ground surface, the following measures would be implemented to evaluate the presence or absence of cultural resources. • For parcels presently covered by pavement or landscaping thatmayobscure the original ground surface,a program of mechanical subsurface testing shall be conducted to determine the presence of buried or obscured cultural material. In the event that any such material:is discovered, additional testing shall be conducted to determine the aerial extent and depth below surface of the deposit area ant to determine the extent of impacts any planned development would have. The above mitigation is intended to demonstrate only the presence or absence of cultural resources on the project site, and us not meant to demonstrate the scientific importance of any deposits. If a qualified archaeologist determines that cultural resources are likely to be present, the following components of the mitigation measure shall be implemented: • If cultural resources have been identified on the site,and the extent of potential impacts to them have been determined in by the presence or absence survey, a qualified archaeologist shall determine if the impacts would be significant enough to require evaluation of the scientific importance of the resources. If it can be demonstrated that prehistoric cultural resources are "unique" or "significant", further mitigation to reduce or eliminate the impact shall be recommended. Mitigations will be implemented prior to granting site and construction permits. • The archaeological testing shall be undertaken when the.Final Development Plan is submitted. • When and if subsurface'borings are done,the work shall be scheduled during a period that does not disrupt the use of the surface parking lots serving commuters in the Station Area. Boreholes shall be 4-10 inches in diameter,depending on the depth needed to extract a reliable sample. • The archaeological investigators shall use hand augers or quiet mechanical equipment to minimize the noise disturbance of boring on nearby residents,commuters,and workers. • All boreholes shall be filled (using Quick Patch Asphalt or similar substance) and flattened immediately after the core sample is extracted so as to maintain the safe use of the parking lots. Potentially significant Impact, Potentially unless Less than significant Mitigation significant impact Incorporated impact No Impact 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: 1. Rupture of a known earthquake fault, as delineated on the most recent Alquist- Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines _...._._.. ....... ......... ......... ......... ......... ......... ......... ......... ......... ....._.._._.__. . ...._.. ......... ......... ......... ......... ..........._.__...... ...... _ __ 10 and Geology Special Publication 42. (Source 2) 2. Strong seismic ground shaking?(Source 2) ✓ 3. Seismic-related ground failure, including liquefaction?(Source 2) 4. Landslides?(Source 2) ✓ b. Result in substantial soil erosion or the loss of ✓ topsoil? (Source 2) 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 on-or off-site landslide, lateral spreading, subsidence, liquefaction or collapse? (Source 2) d. Be located on expansive soil, as defined in ✓ Table 18-1-B of the Uniform Building Code (1994), creating substantial risks to life or property? (Source 2) e. Have soils incapable of adequately supporting ✓ the use of septic tanks or alternative waste disposal systems where sewers are not available for the disposal of wastewater? (Source 2) SUMMARY: The geological and seisrnic conditions of the BART Station Area,an area that includes the site of the proposed Iron Horse Trail overcrossing of Treat Boulevard,was described in the 1982 EIR on the Pleasant Hill BART Station Area General flan Amendment/Specific Plan,as summarized and updated in the 1998 Specific Plan EIR.. The following mitigation measures adopted for the Specific Plan are incorporated into the proposed overcrossing project and will reduce these impact to less than significant. Potentially Significant Environmental Effect (Vla). Strong to violent earthquake ground shaking on active fault zones in the region could cause significant damage to improvements,and in extreme cases, loss of life. Mitigation-Measures* a): Require geotechnical investigations to mitigate effects of engineered fills, settlement and liquefaction. 1. Engineered fills in the planning area shall be properly designed and adequately compacted(i.e. minimum 90% relative compaction as defined by ASTI D1557) to significantly reduce both seismically induced and natural fill settlement. 2. All roads, structural foundations and underground utilities shall be designed to accommodate estimated settlement without failure. 3. Final design of improvements shall be made in conjunction with a design level geotechnical investigation submitted to the County for review. The investigation shall include deep borings and evaluation of liquefaction potential and the report shall estimate the magnitude of differential settlement. If a high liquefaction potential exists, the report shall include measures to control drainage, including measures aimed at controlling damage to buildings, buried pipelines and _. ......_.. ......... ......... ....... .. .. _.. .. ............... ............ __....._.. ..........-_........___.. ...... ... _....... _...... ..._._....._....... _ . ..............._.... lI surface parking. Potentially Significant Environmental Effect(Vld).Expansive soils and/or bedrock have the potential to cause significant damage to foundations,slabs and pavements. Mitigation Measures* (VId): 1. The recommendations of a qualified geotechnical engineer shall be followed. Design-level geotechnical investigation for individual projects shall provide criteria for 'foundation or pavement design developed in accordance with the Uniform Building Code(UBC)and County Code requirements on the-basis of subsurface exploration and laboratory testing. 2. Foundation design shall include drilled pier-and-grade beam foundations,reinforced slabs and thicker pavement sections designed using criteria provided by the design-level geotechnical investigation. Potentially significant Impact, Potentially Unless Less than significant Mitigation significant Impact Incorporated Impact No Impact VII. HAZARDS AND HAZARDOUS MATERIALS- Would the project: a. Create a significant hazard to the public or the ✓ environment through the routine transport, use, or disposal of hazardous materials? (Source 5) b. Create a significant hazard to the public or the ✓ environment through reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment?(Source 5) C. Emit hazardous emissions or handle hazardous ✓ or acutely hazardous materials,substances,or waste within one-quarter mile of an existing or proposed school?(Source 5) d. Be located on a site which is included on a list ✓ ofhazardous materials sites compiled pursuant to Goverment Code Section 65862.5 and,as a result,would it create a significant hazard to the public or the environment?(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 or public use airport,would the project result in a safety hazard for people residing or working in the project area, (Source 5) f. For a project within the vicinity of a private ✓ airstrip,would the project result in a safety hazard for people residing or working in the _ ................... ... .. ._....... _ ._ ....... ..........._.. _.. .__.. .__. .. 12 project area? (Source 5) g. Impair implementation of or physically ✓ interfere with an adopted emergency response plan or emergency evacuation plan? (Source 4) h. Expose people or structures to a significant ✓ risk of loss,injury or death involving wildland fires, including where wildlands are adjacent to urbanized areas or where'residences are intermixed with wildlands?(Source 4) SUMMARY: The project has the potential to release hazardous substances, such as accidental petroleum spills,during construction. These potential impacts are minimized to a less than significant level with standard safety practices (i.e., installing sufficient signs warning about 'construction and detours, marking of underground lines before trenching, etc.). A Phase I Environmental Site Assessment(Jonas&Associates 2001) identified no hazardous substances, petroleum products, solid waste/non-hazardous waste, polychlorinated biphenyls,asbestos-containing materials,storage tanks,herbicides or pesticide conditions on the project site. However, due to automobile emissions along Jones Road and Treat Boulevard, there is a potential for lead to be present in the soil at the study area.Incorporation of the following mitigation measures will reduce the impact to a less than significant level: Potentially Significant Environmental Effect (M): Lead contaminated soils uncovered during excavation and construction of the Iron Horse Trail overcrossing and access ramps could present a potentially hazardous condition to the public and release of hazardous materials into the environment. Mitigation Measures(YM): If contaminated soils or groundwater are encountered during construction activities,work shall cease until appropriate worker health and safety precautions,as specified by Title 8 of the California Code of Regulations(Section 5194)promulgated by the California Occupational Safety and Health Agency (Cal OSHA), are implemented. A qualified hazardous materials specialist shall be notified for an immediate evaluation. • The appropriate regulatory agency shall be contacted. If deemed necessary by the appropriate agency,remediation shall be undertaken in accordance with existing local,state and federal regulations/requirements and guidelines established for the treatment of hazardous substances. ■ Work shall cease in the contaminated area until the nature and extent of contaminations have been established,and proper disposal or remediating has occurred. ■ Any contaminated soils and/or groundwater encountered during construction will require proper disposal. This would likely require removal from the site and transportation to an EPA-approved disposal facility by a Department of Transportation(DOT)certified hazardous waste transporter. ■ The ultimate disposal of encountered contaminated,soils will be based on the chemicals present and chemical concentrations detected through laboratory analysis. Based on the analytical results, appropriate disposal of the material in accordance with, as appropriate, EPA, Department of Substances Control, and Regional Water Quality Control Board guidelines shall be implemented. _ _...._.. ......... ......... ......... ...__.... ......._. .. . __ .. ......... ........... .. ._.._..... .__...._......._....... .......__......_...._..... ........_.. _._.... ......... ......... ......... ...._... ......... 13 Potentially significant impact, Potentially Unless Less than significant Mitigation Significant VIII. HYDROLOGY AND WATER QUALITY -Would Impact Incorporated impact No impact the project: a. Violate any water quality standards or waste ✓ discharge requirements?(Source:2) b. Substantially deplete groundwater supplies or ✓ interfere substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater table level (e.g., the production rate of pre-existing nearby wells would drop to a level which would not support existing land uses or planned'uses for which permits have been granted)?(Source: 2) C. Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, in a manner,which would result in substantial erosion or siltation on-or off--site?(Source:2) d. Substantially alter the existing drainage ✓ pattern of the site or area, including through the alteration of the course of stream or river, or substantially increase the rate or amount of surface runoff in a manner, which would result in flooding on-or off-site?(Source: 2) e. Create or contribute runoff water, which ✓ would exceed the capacity of existing or planned storm water drainage systems or provide substantial additional sources of polluted runoff?(Source: 2) f. Otherwise substantially degrade water quality? (Source: 2) g. Place housing within a l 00-year flood hazard ✓ area as mapped on a federal Flood Hazard Boundary or Flood Insurance Rate Map or other flood hazard delineation map? (Source:2) h. Place within a 100-year flood hazard area ✓ structures that would impede or redirect flood flows?(Source:2) i. Expose people or structures to a significant ✓ risk of loss,injury or death involving flooding, including flooding as a result of the failure of a levee or dam? (Source: 2) j. Inundation by seiche, tsunami, or mudflow? ✓ (Source:2) ....... _. __.. _ _. ._...... ...... .. . ... ....... _ ........................................................................................................................................................................................................................................................................................................................... 14 SUMMARY: The site of the Iron Horse Trail overcrossing and access ramps is not located within a floodplain or located near a body of water where water-related hazards to people or property could result. The nearest surface water body is Walnut Creek,approximately one quarter mile east of the project site.The Contra Costa Canal is approximately cine-quarter mile south of the intersection of Treat Boulevard and Jones Road. The proposed project could result in the discharge of silt from the project site into the storm drain system during construction. The following mitigation measure reduces this impact to a less than significant level. Potentially Significant Impact VIIIe): The proposed project could result in the discharge of silt from the project site into the storm drain system during construction. Mitigation Measure* (VIIIe): At least 30 days prior to the issuance of a grading permit, an erosion control plan shall be submitted for the review and approval of the Grading Section of the Building Inspection Department. The erosion control plan shall provide for the following .measures: All grading,excavation and filling shall be conducted during the dry season(April 15 through October 15) only, and all areas of exposed soils shall be replanted tominimize erosion and subsequent sedimentation. After October 15, the grading permit shall allow only erosion control work. Any modification to the above schedule shall be subject to review by the Grading Section of the Building Inspection Department and the review and approval of the Zoning Administrator. Implementation of this mitigation measure will reduce this impact to less than significant. Potentially significant Impact, Potentially unless Less than significant Mitigation Significant Impact Incorporated Impact No Impact IX. LAND USE AND PLANNING. Would the project: a. Physically divide an established community? (Source: 2) b. Conflict with any applicable land use plan, policy, or regulation of an agency with jurisdiction over the project (including, but not limited to the general plan, specific plan, local coastal program, or zoning ordinance) adopted for the purpose of avoiding or mitigating an environmental effect? (Source: 2) C. Conflict with any applicable habitat V11 conservation plan or natural community conservation plan?(Source:2) SUly1MARY:The approved and adopted Pleasant Hill BART Station Specific Plan called for The Iron Horse Trail overcrossing to integrate bicycle and pedestrian movements from the trail to and from surrounding land uses: "A pedestrian and bicycle overcrossing at?'teat Boulevard in the vicinity of.Jones Raad for Iron Horse Trail circulation is included as part of the Specific Plan. The county,through its Redevelopment Agency,will pursue proceeding with construction to address safety concerns, and subject to funding availability. Redevelopment funding shall be combined with other funding to achieve financial leverage." (POLICY 7,PEDESTRL4N BICYCLE AND ......... ......... ......... ......... ....._. _.. ......... ......_.__. ._....... ......._.. ....._..... ..._..... ......... ......... ._...._.. ..___ ..........._._.. ......... ......... ......... 15 TRANSIT CIRCULATION) "A pedestrian and bicycle overpass should be provided at Tones Road for the Iron Horse Trail,provided that the County Board of Supervisors, in approving the project determine that, among other requirements, the form, height, mass, and setback of the Iron Horse Trail overcrossing is aesthetically and functionally consistent with its proximity to the existing office building at 1400 Treat Boulevard. The convenience of pedestrian access to this building and the Treat Boulevard frontage shall also be provided for in the design of the overpass. Location and design of the bridge shall be reviewed and approved by the County Planning Commission after a public hearing." l'POLICY2,:BICYCLE AND PEDESTRIAN CIRCULATIGtN) "Undertake a community design program for both pedestrian and bicycle overcrossings as soon as feasible given availability offunding and reasonable defined site geometrics. The community design program would result in preliminary design(s) for the overcrossing sufficient to secure competitive funding." {POLICY 7, BICYCLE AND PEDESTRIAN CIRCUL TI'0N) One of the major design concepts embodied in the Plan included an emphasis on enhancing pedestrian access to the Pleasant Hill BART Station Area(SPECIFIC PLAN,URBAN DE510N}: "Emphasize Treat Boulevard as the major entranceway to the Station Area and visually identify this role by the placement of...the pedestranlbicycle overpass at Jones Road ..." The Pleasant Hili BART Station Specific Plan identifies the Iron House Trail as an appropriate use of the Utility/Open Space Corridors identified at the site of the proposed Treat Boulevard overcrossing as Subarea 13 and Subarea 16: "The Iron .Horse Trail would include a pedestrian and bicycle overcrossing of Treat Boulevard between Subareas 13 and 16 in the immediate vicinity of Jones Road." Potentially significant Impact, Potentially Unless Less than significant Miagation Significant Impact Incorporated Impact No hnpact X. MINERAL RESOURCES . Would the project: a. Result in the loss of availability of a known mineral resource that would be of value to the region and the residents of the state?(Source: 2) b. Result in the loss of availability of a locally- important mineral resource recovery site delineated on a local general plan, specific plan or ether land use plan? (Source: 2) SUMMARY: Due to the nature of the project and the site description,the proposal will not result in impacts to mineral resources. ....11.11. __...... ......... ......... ......... ......... ......... ......... ......... _........._1111.. ......... ......... ......... ......... ......... _.. ...... ......._... ..................................................................... ... . 16 Potentially significant Impact, Potentially Unless Less than significant Mitigation Significant Impact Incorporated Impact No Impact XI. NOISE. Would the project: a. Exposure of persons to or generation of noise ✓ levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? (Source: 2) b. Exposure of persons to or generation of ✓ excessive ground borne vibration or ground borne noise levels?(Source: 2) C. A substantial permanent increase in ambient ✓ noise levels in the project vicinity above levels existing without the project? (Source: 2) d. A substantial temporary or periodic increase in ✓ ambient noise levels in the project vicinity above levels existing without the project? (Source: 2) e. For a project located within an airport land use ✓ plan or, where such a plan has not been adopted, within two mules of a public airport or public use airport,would the project expose people residing or working in the project area to excessive noise levels? (Source:2) f. For a project within the vicinity of a private ✓ airstrip, would the project expose people residing or working in the project area to excessive noise levels?(Source: 2) SUMMARY: Short-term noise levels would be expected to occur during construction of the Iron Horse Trail overcrossing and access ramps. Sensitive noise receptors include the nearby office building at 1400Treat Boulevard. However,standard conditions of approval that include restricting construction hours, traffic flow and heavy equipment usage will reduce the noise effects. Incorporation of the following mitigation measures will reduce noise impacts to a less than significant level: Potentially Significant Environmental Effect ('Gd). Short-term noise level increases at sensitive locations in and surrounding the Specific Plan area would be expected during periods of heavy construction. Mitigation Measures*(Xld-1): Implement County construction noise policy limiting construction to the hours of 7:30 AM — 5:00 PM Monday-Friday. Require construction contractors to include measures to reduce equipment noise such as: + All internal engine-driven equipment shall be equipped with mufflers that are in good condition; ......... ......... ......... ......... ... 11 ......................_.__.. ._....... ......... ......... ......... ......... ......... _.. .. .._........ ......... ......... ......... ..................................................... 17 • Use'quiet' gasoline-powered compressors or other electric-powered corepressors wherever possible. • Retain a disturbance coordinator to monitor construction activity and to identify additional mitigation measures as needed,consistent with the impacts and mitigation measures identified in the EIR Mitigation Measures (XId-2 : If concerns are raised about potential vibration from project construction,the construction contractor shall respond by informing those individuals about the nature and schedule of construction,and by minimizing vibration-causing construction activities to the extent practicable. Potentially significant Impact, Potentially Unless Less than significant Mitigation Significant impact Incorporated Impact No Impact XII. POPULATION AND HOUSING-Would the project: a. Induce substantial population growth in an ✓ area, either directly (for example, by proposing new homes and businesses) or directly (for example, through extension of roads or other infrastructure)?(Source:2) b. Displace substantial numbers of existing ✓ housing, necessitating the construction of replacement housing elsewhere?(Source: 2) C. Displace substantial numbers of people ✓ necessitating the construction of replacement housing elsewhere?(Source: 2) SUMMARY: The proposed overcrossing of Treat Boulevard would separate users of the Iron House Trail from heavy vehicular traffic at the crossing of Treat Boulevard and the intersection with Jones Road. The project area is mostly paved,with some gravel ground cover. As such,the project would not induce population growth or displace existing housing,or people. Potentially significant Imps Potentially Unless Less than significant Mitigation Significant Impact Incorporated Impact No Impact XIII. PUBLIC SERVICES Would the project: a. Would the project result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, need for new or physically altered governmental facilities, the construction of which could cause significant environmental impacts, in order to maintain acceptable service ratios, response times or other ✓ .......... ......... 1 _..... ......... ......... ......... .... ..... _........ ....... . _.. ......... ......... ......... ......... ......... ......... .......... ......... ......... ......... ......... ......_.. 18 performance objectives for any of the public services: (Sources: 2) 1. Fire Protection? 2. Police Protection? ✓ 3. Schools? 4. Parks? S. Other Public facilities? ✓ SUMMARY: The Iron Horse Trail overcrossing will have no effect on public services. No adverse effects on schools,parks, and other public facilities are anticipated. Potentially significant Impact, Potentially Unless Less than significant Mitigation Significant Impact incorporated impact No Impact XIV. RECREATION- a. Would the project increase the use of existing . ✓ neighborhood and regional parks or other recreational facilities such that substantial physical deterioration of the facility would occur or be accelerated?(Source:2,4) b. Does the project include recreational facilities ✓ or require the construction or expansion of recreational facilities, which might have an adverse physical effect on the environment? (Source: 2, 4) SUMMARY: The proposed Iron Horse Trail overcrossing provides a safe crossing of Treat Boulevard and avoids pedestrian/bicycle conflicts with the high volume and relatively high speed of that major thoroughfare. The overcrossing would enhance the regional importance of the Iron Horse Trail to users of all age groups and skill levels. The East Bay Regional Park District's completion of the Iron Horse Trail will span the distance from Livermore in Alameda County to Suisun Bay in Contra Costa County,a distance of over 40 miles. The Pleasant Hill BART Station.Area Specific Plan provides for connections between the BART Station and the Iron Horse Trail. The design of the Treat Boulevard overcrossing will be coordinated with East Bay Regional Park District regarding the planning and completion of the alignment of the Iron Horse Regional Trail.The Iron Horse Trail overcrossing will enhance pedestrian and bicycle access to regional recreation. 19 Potentially significant Impact, Potentially Unless Less than significant Mitigation Significant Impact Incorporated Impact No Impact XV. TRANSPORTATION/TRAFFIC Would the project: a. Cause an increase in traffic, which is substantial in relation to the existing traffic load and capacity of the street system (i.e., result in a substantial increase in either the number of vehicle trips, the volume to capacity ratio on roads, or congestion at intersections)?(Source: 2,3) b. Exceed,either individually or cumulatively,a ✓ level of service standard established by the county congestion management agency for designated roads or highways?(Source:2,3) C. Result in a change in air traffic patterns, ✓ including,either an increase in traffic levels or a change in location that results in substantial safety risks?(Source: 2,3) d. Substantially increase hazards due to a design ✓ feature (e.g., sharp curves or dangerous intersections)or incompatible uses(e.g.,farm equipment)?(Source: 2,3) e. Result in inadequate emergency access? ✓ (Source:2,3) f. Result in inadequate parking capacity? ✓ (Source:2,3) g. Conflict with adopted policies, plans, or ✓ programs supporting altemative transportation (e.g., bus turnouts, bicycle racks)? (Source: 2,3) SUMMARY: The current lane configurations for Jones Road(south of Treat Boulevard),(yak Road(south of Treat Boulevard),and Treat Boulevard(westbound and eastbound to Jones)are as follows: ■ Northbound Jones Road: There are three traffic lanes;a dedicated left turn lane to westbound Treat Boulevard, a combination right turn/through lane, and a dedicatedright turn to eastbound Treat Boulevard. ■ Southbound Jones Road:: There are two southbound lanes; one a dedicated right turn, the other a through lane. ■ Northbound Oak Read: There are four traffic lanes;two dedicated left turn lanes to westbound Treat Boulevard, a dedicated through lane,and a combination through/right turn lane to eastbound Treat Boulevard. ..................................................................................................................................I................................... .....................................................................................I'll............... 20 • Southbound Oak Road: There are two southbound through lanes. • Westbound Treat Boulevard: There are five traffic lanes; one left turn lane to southbound Jones Road,three through lanes, and a right turn lane to northbound Jones Road. • Eastbound Treat Boulevard: There are six traffic lanes; two left turn lanes to,northbound Jones Road, three dedicated through lanes, and one combination through/right turn/through lane to southbound Jones Road. Iron Horse Trail overcrossing structure and access ramps would be constructed within the existing right turn lane on northbound Jones Road to eastbound Treat Boulevard, thereby removing that lane from vehicular traffic. The existing"at-grade"crossing of Treat Boulevard at Jones Road would remain. The alignment of the access ramps and bridge overcrossing would be outside the easement of future transit corridors within the former Southern Pacific right-of way (Policy 3. Pedestrian, Bicycle, and Transit Circulation): "A minimum 20'wide right-of-way shall be maintained within the former Southern Pacc Railroad right-of-way to Monument Boulevard toprovide for regional pedestrian and bicycle circulation. Right-of-way shall also be preserved for future fixed guideway use within the corridor. A transit use maybe elevated or at grade, and may share right-of-way with vehicular roadways. Additional environmental review of a fixed guideway proposal will occur. The County shall prepare a management plan that demonstrates how temporary uses of the right-of-way will be established in a manner that does not obstruct or otherwise adversely impact the construction and operation of thefixed guideway transit. When afixed guideline line is proposed for the Southern Pacific right-of-way, it shall be sited and designed in a manner that minimizes conflict with trail users, does not create safety hazards, is aesthetically compatible with open space use and does not reduce the trail width available for walkers andlor bicyclists. Within one year of adopting the proposed Specific Plan, the County shall initiate preparation of management program to show how thefixed guideway transit and trail use can be safely accommodated in an aesthetically pleasing manner. This may involve a change of alignment in the Southern-Pacific right-of-way. Determining a future fixed guideway station location should include consideration of an inter-connection with the BART system given opportunities andlor limitations imposed by technology, costs, land use and safety." The construction of the landing ramp from the overcrossing on the north end of the structure would eliminate some temporary BART parking spaces located in the former Southem Pacific Right-of-Way. No permanent parking spaces would be eliminated as a result of this project.The development of Specific Plan Subareas 11 and 12,on the northwest comer of Treat Boulevard and Jones Road,would replace the displaced temporary parking resulting from construction of the overcrossing ramp on the north end of the structure.As part of the development of Subareas 11 and 12, permanent parking available to BART patrons (1,337 spaces in the existing parking garage and 1,477 surface lots spaces) would be expanded by an additional 581 spaces (relocation of temporary parking spaces on the former Southern Pacific Right-of-Way To replace the right turn at the intersection of Jones and Treat Boulevard,a new northbound right hand turn only lane on Oak Road to Treat Boulevard would be constructed.Construction of the Oak Road right tum lane is to be completed prior to the beginning of construction of the overcrossing at Jones Road and Treat Boulevard. Because of this additional right turn lane on Oak Road (one block west of Jones Road), the elimination of the right tam lane on Jones Road is not expected to negatively affect traffic flow in the project area. ........................................ 21 The construction of first,the new right turn lane on Oak Road, and subsequently the access ramp and Iron Horse Trail overcrossing within the existing right turn lane on Jones Road, would result in short-term, temporary impacts on pedestrian and vehicular circulation. On each of these streets,the temporary closure of at least one additional lane may required during the respective construction periods to provide space for the construction activities, staging of equipment, temporary construction vehicle parking, and storage of construction materials. For Oak Road,the temporary closure of the existing combination through/right turn lane may be four to six weeks in duration. For Jones Road,the through lane adjacent to the existing right turn lane may be temporarily closed fora considerably longer period. Potentially Significant Environmental Effect Ma). Short-term,temporary disruption ofpedestrian and vehicular access and circulation would be expected during periods of construction of the new right turnn lane on Oak Road,and the access ramp and overcrossing at Jones Road and Treat Boulevard. Mitigation Measures(XIVa): Significant lung term traffic and circulation impacts are not anticipated as a result of construction ofthe right turn lane on Oak Road,and the construction and operation of the Iron Horse Trail overcrossing of Treat Boulevard. Several mitigation measures, however, may be available to minimize potential transportation and circulation impacts during construction of the proposed structures,including: Scheduling ■ Scheduling,of construction shifts or lane closures so that the majority of construction related traffic/circulation disruption occurs outside of peak commuting hours, • Scheduling,to the maximum extent possible, delivery of construction materials outside of peak commuting hours. Public Notification ■ Require construction contractor to give notification to public agencies and to the general public to alert them in advance of lane closures, • Changeable Message Sign(CMS)boards or other appropriate notification devices shall be installed at least 3 consecutive days prior to a lane closure; • As needed, warning signs shall be placed at appropriate locations in advance of the construction operation to alert traffic within the affected streets,and cones or other approved devices shall be placed to safely channel pedestrian and vehicular traffic. Safe Crossings,Vehicular Access, and Barriers • Prior to the construction of the dedicated new right turn lane on Oak Road,the construction contractor shall temporarily reroute pedestrian traffic to the west side of Oak Road,the east side of Oak Road shall be temporarily closed to pedestrian access; ■ At least three traffic lanes (northbound left, through or right turn) on Oak Road shall be maintained; • During construction of the access ramps and overcrossing of Treat Boulevard at Jones Road, the construction contractor shall temporarily reroute pedestrian and bicycle traffic to the west 22 side of Jones Road, the east side of Jones Road shall be temporarily closed to pedestrian access; ■ At least one combination left turn/through northbound traffic lane on Jones Road shall be maintained; ■ The construction contractor shall place and maintain barriers and warning devices necessary for safety of the general public. ■ Flagrrlen shall be provided as necessary to control the flow and circulation of traffic and pedestrian crossings. Maintenance of Existing BuildingAccess ■ The construction contractor shall maintain the existing pedestrian access to the Treat Boulevard/Jones Road building entry to the John Muir Health Center Administrative Ofcesat 1400 Treat Boulevard. Potentially significant Impact, Potentially Unless Less than significant Mitigation Significant Impact Incorporated Impact No Impact XVI. UTILITIES AND SERVICE SYSTEMS-Would the proj ect: a. Exceed wastewater treatment requirements of ✓ the applicable Regional Water Quality Control Board? (Source:2,4) b. Require or result in the construction of new e ✓ water or wastewater treatment facilities or expansion of existing facilities, the construction or which could cause significant environmental effects?(Source: 2,4) C. Require or result in the construction of new storm water drainage facilities or expansion of existing facilities, the construction of which could cause significant environmental effects? (Source 2,4) d. Have sufficient water supplies available to V11 serve the project from existing entitlement and resources,or are new or expanded entitlement needed?(Source:2,4) e. Result in a determination by the wastewater � ✓ treatment provider,which serves or may serve the project that it has adequate capacity to serve the project's projected demand in addition to the provider's existing commitments?(Source: 2,4) f. Be served by a landfill with sufficient permitted capacity to accommodate the project's solid waste disposal needs?(Source: _... ._....... ..._..._. 1.111... .... ........... ....... .......... _ .........................__. . _.. ......... 23 2,4) g. Comply with federal, state and local statutes ✓ and regulations related to solid waste? (Source: 2,4) SUMMARY: The proposed Iron Horse Trail overerossing is within existing urban boundaries, served by various utilities, including PG& E, Telephone companies, Contra Costa Water District, Central Sanitation District,and Flood Control District. Since the proposed project is within the service boundaries,the project will not result in a need for new systems or supplies, or substantial alterations to the utilities. The proposed project will have no effect on wastewater treatment requirements or facilities. The project will not result in any increased generation of wastewater or change in effluent water quality. The overcrossing structure and access ramps will have no effect on the demand for water supplies or change the demand for solid waste disposal capacity. Potentially significant Impact, Potentially Unless Less than significant Mitigation Significant Impact Incorporated Impact No impact XVII. MANDATORY FINDINGS OF SIGNIFICANCE- a. Does the project have the potential to degrade ✓ the quality of the environment, substantially reduce the habitat of a fish and 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 or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California history or prehistory? (Source: 2,4,6) 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)?(Source:2,3,4,5,6) C. Does the project have environmental effects, y' which will cause substantial adverse effects on human beings, either directly or indirectly? (Source: 2,3,4,5,6) SUMMARY: The project does not have the potential to degrade the quality of the environment,significantly impact biological resources(see#IV-Biological Resources)or eliminate major period of California history or prehistory(see#V-Cultural Resources). 24 No impacts that would be cumulatively considerable as a result of the proposed project have been identified. 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