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HomeMy WebLinkAboutMINUTES - 06271995 - C2 TO: BOARD OF SUPERVISORS, FROM: J. MICHAEL WALFORD, PUBLIC WORKS DIRECTOR DATE: June 27, 1995 SUBJECT: Approve Highland Road Bridge Replacement Project, in the Danville area. Project No. 0662-6R4084-94, CDD-CP # 95 - 3. Specific Request(s) or Recommendation(s) & Background & Justification I. RECOMMENDED ACTION: APPROVE Project, and FIND, on the basis of the initial study and all comments received, that there is no substantial evidence that the project will have a significant effect on the environment, ADOPT the Negative Declaration 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 Public Works Director to begin right of way acquisition and to prepare contract plans and specifications for construction. DIRECT the Director of Community to file a Notice of Determination with the County Clerk. Continued on Attachment: X SIGNATURE: _RECOMMENDATION OF COUNTY ADMINISTRATOR _RECOMMENDATION OF BOARD COMMITTEE APPROVE OTHER SIGNATURE(S): ACTION OF BOARD ON 3 27� 19 9 APPROVED AS RECOMMENDED ,-* OTHER_ VOTE OF SUPERVISORS ✓✓ UNANIMOUS (ABSENT ) AYES: NOES: ABSENT: ABSTAIN: BF:kd g:Design\BO\BO4.t4 Orig.Div: Public Works(Design Division) Contact: cc: County Administrator I hereby certify that this is a bus and connect copy of Attn: E.Kuevor an action taken and entered On the minutes of the Audkor-Controller Board of Supervisors on the�shown, Accounting V. —%&, e27 1 9 V.Germany-Design A'RE$�p: p Construction PHIL BA HELOR,Clerk 6f the Board i H.Ballenger,Transportation Engineering Community Development-G.Slusher of Supervisors and County Administrator ? l byDeputy Highland Road Bridge Replacement Project in the Danville Area ' June 27, 1995 Page Two II. FINANCIAL IMPACT: The estimated project cost is $513,000 funded by Hazardous Bridge Rehabilitation and Replacement (H.B.R.R.) (80%) and Road Funds (20%). III. REASONS FOR RECOMMENDATION/BACKGROUND: The project includes replacing the existing 20 foot wide on an improved alignment Highland Road Bridge with a 32 foot wide concrete box girder bridge approximately 200 feet downstream of the existing bridge. The H.B.R.R. process has determined that the existing bridge on Highland Road at Tassajara Creek to be in need of replacement. The project has been determined to be in compliance with the General Plan. A Negative Declaration of environmental significance pertaining to this project was published on February 23, 1995, with no protest, and the Board has considered the negative declaration together with all comments received during the public review period. IV. CONSEQUENCES OF NEGATIVE ACTION: Delay in approving the project will result in a delay of design and construction and may jeopardize funding. � . 2 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: (510) 313-2296 Contact Person: Vickie Germany, Public Works Dept. Project Description,Common Name(if any)and Location: HIGHLAND ROAD BRIDGE REPLACEMENT, County File#CP 95-3: The project involves replacing the existing two-lane, 21-ft. wide, 804t. long, bridge with a new, two-lane, 32-foot wide, 90-ft. long, prestressed cast-in-place concrete box girder bridge, approximately 200 ft. downstream of the existing bridge. The existing bridge is eligible for replacement under the Federal Highway Bridge Rehabilitation and Replacement program. The abutments on the east side of the proposed bridge will be constructed approximately 15 ft.east of the top-of-bank and the steep slope in this area will be cut back to a 1.5:1 slope. In addition, rock slope protection will be placed approximately 25 ft. upstream and downstream of the proposed bridge and exposed slopes will be hydroseeded. Approximately 400 ft. of Highland Road (200 ft. east and 200 ft. west of the proposed bridge) will be realigned to conform with the new bridge. The realigned roadway will be constructed to a width of 30 feet The existing bridge will be removed and the existing segments of 20-ft.wide roadway obliterated upon completion of the project. •A portion (approximately three- quarters of an acre) of a 9.15 acre parcel, which is under Williamson Act contract, will be acquired for right-of-way purposes. Utilities may also need to be relocated as a result of the project. Existing roadside drainage ditches will be modified to drain the realigned roadway and discharge into Tassajara Creek. • Approximately four trees (a 28-inch diameter at breast height (dbh) coast live oak, a 6- inch dbh valley oak,a 26-inch dbh valley oak,and 24-inch/18-inch dbh multiple trunk valley oak)may be removed from the riparian area; and, another nine trees (coast live oak and valley oak) with dbh ranging from one to four inches and two walnut orchard trees may be removed to allow for the road alignment and bridge construction. Items #5- 10 from the summary of the Environmental Evaluation are also included in the project. • Subject project is located at the Highland Road Bridge and approximately 200 feet south (site of proposed replacement bridge) over Tassajara Creek in the Danville area of central Contra Costa County. The parcels adjacent to Highland Road are designated as "Agricultural Lands" in the County General Plan and are currently used as pasture land and walnut orchards. The project was approved on Pursuant to the provisions of the California Environmental Quality Act: QAn Environmental Impact Report was prepared and certified. QThe Project was encompassed by an Environmental Impact Report previously prepared for © A Negative Declaration was issued indicating that preparation of an Environmental Impact Report was not required. 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. © The Project will not have a significant environmental effect. Q 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 &Game Fees Due: County Public Works Department EIR - $850 Total Due: $ 255 Glacier Drive ,/ Neg. Dec. - $1,25.0 Total Paid: $ Martinez, CA 94553 DeMinimis Findings - $0 Attn: Janet Frattini ./ County Clerk- $25 Receipt #: CONTRA COSTA COUNTY COMMUNITY DEVELOPMENT DEPARTMENT DATE: 7 ✓/S TO: Development Engineer/Architect FROM: James W. Cutler, Chief of Comprehensive Planning ��C" SUBJECT: MANDATORY REFERRAL FOR GENERAL PLAN CONFORMANCE Community Development staff has reviewed the attached project, CP 95--L to determine if mandatory referral for General Plan Conformance, as required by,Section 65402 of the Government Code, is necessary. The project needs no further mandatory referral clearance from County staff subject to the following actions: WThis project has been determined to be exempt from 65402 review. ( ) This project has been determined to be exempt from 65402 review in accordance with the Board of Supervisors Resolution 81/522 because the project involves a road alignment project of a minor nature. ( ) This project should be referred to the City of for 65402 review. ( ) Community Development staff makes the following attached recommendation which should be incorporated into the staff report on this matter. The project needs mandatory referral and County staff will process this project in the following manner: ( ) 65402 review is required. Community Development staff will carry this matter before the appropriate Planning Commission. ( ) 65402 review must be withheld until completion of an Environmental Impact Report on this project. O Other procedures. JWc:gms c:sh1\MR4ypc CHarvey E. Bragdon Community Contra Development Director of Community Development Department Director County Administration Building County 651 Pine Street 4th Floor, North Win �E!+c Martinez, California 94553-0095 Phone: 646-4202 February 22, 1995 01 z s�'4 COUN� County File #CP 95-3 Attention: Public Works Department Janet Frattini - Design Division Dear Applicant: The Contra Costa County Community Development Department has completed an initial study of the environmental significance of the project represented by your pending application bearing County File Number CP 95-3(Highland Road Bridge Replacement). In conformance with Contra Costa County Guidelines for implementing the California Environmental Quality Act of 1970 (CEQA), it has been determined that your project will not have a significant effect on the environment. Your project falls within the following category: (✓) AN ENVIRONMENTAL IMPACT REPORT (EIR) IS NOT REQUIRED. ( ) The project is categorically exempt (Class ). ( ) The CEQA requirements are accommodated by the EIR previously prepared for (✓) A statement that an EIR is not required (Negative Declaration of Environmental Significance has been filed by the Community Development Department (unless appealed)). ( ) Other: General Rule of Applicability (Section 15061(b)(3)) ( ) AN ENVIRONMENTAL IMPACT REPORT (EIR) IS REQUIRED. ( ) The complexity of your project requires your submission of additional special reports or information (as outlined on the attached sheet) (which will be outlined in a forthcoming letter). ( ) A consultant will be hired to prepare the environmental impact report. This procedure is explained on the attached sheet. Preparation of the EIR cannot be started until the fee and additional information requested is received by the Community Development Department. If you have questions concerning this determination or desire additional information relative to environmental impact report regulations, please call (510) 646-2031 and ask for Debbie Chamberlain. Sincerely yours Harvey E. Bragdon Director of Community Development By: :gme shl\t E. Community Contra Harvey of Coommummun Director of nity Developm6nt Development Costa Department Cou County Administration Building ry 651 Pine Street 4th Floor, North Wing !kg_ Martinez, California 945530095 Phone: 646.4202 .' February 23, 1995 Z < CS------------- NOTICE - FNOTICE OF INTENT TO ADOPT A NEGATIVE DECLARATION HIGHLAND ROAD BRIDGE REPLACEMENT, County File #CP 95-3: The project involves replacing the existing two-lane, 21-ft. wide, 80-ft. long, bridge with a new, two-lane, 32-ft. wide, 90-ft. long,prestressed cast-in-place concrete box girder bridge, approximately 200 ft. downstream of the existing bridge (see Figure 3). The existing bridge is eligible for replacement under the Federal Highway Bridge Rehabilitation and Replacement(HBRR) program. The abutments on the east side of the proposed bridge will be constructed approximately 15 ft. east of the top-of-bank and the steep slope in this area will be cut back to a 1.5:1 slope (see Figure 4). In addition, rock slope protection will be placed approximately 25 ft. upstream and downstream of the proposed bridge and exposed slopes will be hydroseeded. Approximately 400 ft. of Highland Road (200 ft. east and 200 ft. west of the proposed bridge) will be realigned to conform with the new bridge. The realigned roadway will be constructed to a width of 30 ft. The existing bridge will be removed and the existing segments of 20-ft. wide roadway obliterated upon completion of the project. A portion (approximately three-quarters of an acre) of a 9.15 acre parcel, which is under Williamson Act contract, will be acquired for right-of--way purposes. Utilities may also need to be relocated as a result of the project. Existing roadside drainage ditches will be modified to drain the realigned roadway and discharge into Tassajara Creek. Approximately four trees (a 28-inch diameter at breast height (dbh) coast live oak, a 6-inch dbh valley oak, a 26-inch dbh valley oak, and 24-inch/18-inch dbh multiple trunk valley oak) may be removed from the riparian area; and, another nine trees (coast live oak and valley oak) with dbh ranging from one to four inches and two walnut orchard trees may be removed to allow for the road alignment and bridge construction (see Figure 3). Items #5 - 10 from the summary of the Environmental Evaluation are also included in the project. . Subject project is described as follows: The project is located at the Highland Road Bridge and approximately 200 ft. south (site of proposed replacement bridge) over Tassajara Creek in the Danville area of central Contra Costa County (see Figures 1 and 2). The parcels adjacent to Highland Road are designated as "Agricultural Lands" in the County General Plan and are currently used as pasture land and walnut orchards. As the owner of abutting property, or as an otherwise interested person or organization, you are invited to submit any comments you may have on this project, and raise .any significant environmental issues of which you are aware so that they can be considered in the environmental review process. To Interested Agencies/Organizations Notice of Negative Declaration Highland Road Bridge Replacement Page Two This letter plus enclosures will constitute a Notice of Intent. Please circulate this information to the appropriate persons and agencies as soon as possible. I would encourage those interested to contact the Public Works Department, Design Division, Attention: Vickie Germany, 255 Glacier Drive, Martinez, CA 94553 directly by letter to convey any concerns they may have about the environmental review for the project no later than Monday. March 27. 1995 at 5:00 p.m. The Notice of Intent is available for review at the Public Works Department (address is listed above). If you require further information regarding the proiect itself, please contact Bill Fernandez of Contra Costa County Public Works Department,Design Division, at (510) 313-2294. If you have any comments regarding the environmental review of this Notice of Intent, please contact Ms. Germany at (510) 313-2296. Sincerely yours, Dennis Barry Deputy Director :gms co:94-65noi.pw Enclosures CONTRA PUBLIC WORKS DEPARTMENT ' COSTA INITIAL STUDY COUNTY OF ENVIRONMENTAL SIGNIFICANCE FILE: 0662-6R4084-94 CP#: Q�-3 PROJECT NAME: Highland Road Bridge Replacement PREPARED BY: Maureen Toms DATE: January 11, 1995 REVIEWED BY`:`tam DATE: RECOMMENDATIONS: () Categorical Exemption (Class ) (d) Negative Declaration () Environment Impact Report Required ( ) Conditional: Negative Declaration The project will not have a significant effect on the environment. The recommendation Is based on the following summary of the Environmental Evaluation: 1. The project will not create unstable earth conditions, changes in geologic substructures or increase the exposure of people or property to geologic or water related hazards. The steep bank on the east side of the creek will be graded to a 1.5:1 slope,rock slope protection will be placed on the slopes, and exposed areas of the creek banks will be hydroseeded. These measures are features of the project and will minimize erosion potential. 2. No significant negative aesthetics will result from the project. The trees to be removed shall be replaced with native species appropriate for the area at a 3:1 ratio and exposed areas will be hydroseeded. 3. The project will not encroach upon habitat of any unique,threatened or endangered species of animals. No new species of animals will be introduced into the area as a result of the project. in addition,there will be no removal of fish or wildlife habitat. 4. The project will convert only a minor amount(less than one acre) of agricultural land, under Williamson Act contract, to a roadway and public right-of-way. Construction activities will create minor, short-term,temporary impacts. But no significant impacts will occur since the following best management practices are incorporated into the project and in project specifications: 5. There will be no significant change in the air quality in the project area. Construction machinery and vehicles will emit exhaust fumes and possibly objectionable odors during construction which may temporarily deteriorate air quality. To minimize the impact, contract specifications shall stipulate the use of properly tuned and muffled equipment. Air quality impacts will also be reduced by eliminating unnecessary idling of machines when not in use. Dust palliatives or water may be applied to minimize fugitive dust during construction, if warranted. 6. Construction of the replacement bridge shall occur during periods of low or no flow (e.g.April 15 to October 1)to avoid water quality impacts. If water is present, the construction area shall be de-watered by installing cofferdams and diverting water through a pipe,around the work site,to be discharged downstream in a non-erosive manner. Furthermore, sediment traps and/or filters shall be installed on an as- needed basis. 7. Caltrans Standard Specifications will apply regarding construction noise. Limiting the hours of work to 7:30 a.m.-5:00 p.m.,Monday through Friday, unless modified upon written approval,will also minimize noise impacts. Initial Study Highland Road Bridge Replacement Page 2 8. Standard construction safety practices shall be followed during construction to ensure no accidental release of hazardous substances or increase the potential for exposure to these substances. The project has the potential for interfering with an emergency response, but emergency response agencies in the area shall be i notified prior to the onset of construction. 9. The existing bridge will remain open during construction of the replacement bridge. Traffic may be diverted within the proposed right-of-way during construction of the new Highland Road/Camino Tassajara intersection and the segment of roadway where the existing Highland Road conforms to the realigned roadway. This will create a temporary inconvenience,which will be minimized by installing sufficient signs warning of construction. No work shall be performed between 5:00 a.m. and 8:30 a.m.,nor between 4:30 p.m.and 6:30 p.m.which could interfere with commute traffic on Camino Tassajara. In addition, no work which could interfere with commute traffic on Highland Road shall be performed between 6:00 a.m. and 8:30 a.m.,nor between 4:30 p.m.and 6:30 p.m. 10. There are no rare or endangered species of plants in the project area: The trees to be removed shall be replaced with native species appropriate for the area at a 3:1 ratio and exposea areas will be hydroseeded. Construction mats shall be used in the creek bed to minimize impacts to this habitat during construction, as needed. No construction activities shall take place in the area designated as "Environmentally Sensitive Area"on the project plans. What changes to the project would.mitigate the identified impacts. N/A USGS Quad Sheet:Tassajara Base Map Sheets: W-20 Parcel#205-040-011 GENERAL CONSIDERATIONS: 1. Location:The project is located at the Highland Road Bridge and approximately 200 ft. south (site of proposed replacement bridge) over Tassajara Creek in the Danville area of central Contra Costa County(see Figures 1 and 2). The parcels adjacent to Highland Road are designated as"Agricultural Lands" in the County General Plan and are currently used as pasture land and walnut orchards. 2. Project Description: The project involves replacing the existing two-lane, 21-ft. wide,804t. long, bridge with a new,two-lane, 32-ft.wide, 90-ft. long, prestressed cast4n-place concrete box girder bridge, approximately 200 ft. downstream of the existing bridge(see Figure 3). The existing bridge is eligible for replacement under the Federal Highway Bridge Rehabilitation and Replacement(HERR)program. The abutments on the east side of the proposed bridge will be constructed approximately 15 ft east of the top-of-bank and the steep slope in this area will be cut back to a 1.51 slope(see Figure 4). In addition,rock slope protection will be placed approximately 25 ft. upstream and downstream of the proposed bridge and exposed slopes will be hydroseeded. Approximately 400 ft. of Highland Road(200 ft east and 200 R west of the proposed bridge)will be realigned to conform with the new bridge. The realigned roadway will be constructed to a width of 30 ft. The existing bridge will be removed and the existing segments of 20-ft.wide roadway obliterated upon completion of the project. A portion(approximately three-quarters of an acre)of a 9.15 acre parcel,which is under Williamson Act contract, will be acquired for right-0f--way purposes. Utilities may also need to be relocated as a result of the project. Existing roadside drainage ditches will be modified to drain the realigned roadway and discharge into Tassajara Creek. . Approximately four trees(a 28-inch diameter at breast height(dbh)coast live oak, a 64rich dbh valley oak, a 26-inch dbh valley oak,and 24-inch/18-inch dbh multiple Initial Study Highland Road Bridge Replacement Page 3 trunk valley oak)may be removed from the riparian area; and, another nine trees (coast live oak and valley oak)with dbh ranging from one to four inches and two walnut orchard trees may be removed to allow for the road alignment and bridge constnxtion(see Figure 3). Items#5-10 from the summary of the Environmental Evaluation are also included in the project. 3. Does It appear that any feature of the project will generate significant public concern? I]yes I]no IV]maybe (Nature of concern): Traffic delays during construction may be a concern. d. Will the project require approval or permits by other than a County agency? I✓]yes I]no Agency Name(s): California Department of Fish and Game, U.S. Army Corps of Engineers, Regional Water Quality Control Board 5. Is the project within the Sphere of Influence of any city?No MT3W z �► _7 - > 20 A O CD _� r'- N t7 :0 "; Zm > 3� � 0. b --> z O � r- ' > ,� 00 7'-I C z r --` o `T7 O > rp? 3 ) CZT Q C O C) Z Q D A rr? Z O O 3unou r r VI; 081P e9s 009 ov ac > V > cl, 43 Y"- CZ V jrr Ton N ll!WPUIM 0001- zq- M we:.. 4 A �\Z Z21 v NOULV001 103roUd 1N3VGOV-1d38 -1 H E)I H a. 3 E)G I U 9 OVOU aNV C, 7,�� %I Li 9 fit c lam 1 f i )i c tv- Ego "A' (lam 0 A m j � ,0fryer. �q I , . I A I! , i. 99 V �7) 7 '✓ x I V. (p .9v Z Dr t 00 fn A4) I J 0— _3 / �x) c -j 1 0 0 'l 1 I /r �` 71 r! l J� i ! _ 1\ ) ( Wit- �r�� 6v Sol, !v < Z� S r)TI— (9%L PM.AOJ 01014d) 000'tZ: :31VOS ,916umpen(D eiujoj!leo 'Ejuresse-L 41JON� eE)JV JOE)Iojd luawooeldelli 86p!j8 PPOH Pue1q6.1H Z 3unsij 4 ; 4 r r I ' , 1 = r 1 i , „ , e i 10� c z �Z Q , t ... t3 a w c W Q w ,11 , c a cc cl) riii 1 i J IY tN l C CL f ` ,+ t a a I 1 fr 6Q5CREEK »` m (000 CL ;It , zw ! � / / // w ¢ 1 H � op 4 ,rz Ix ui w t) "`---.... w �t.�. Z I ro LU w cri LU L r , CAMINO TASSAJARA11 1 32+00 a3+0 FIGURE 4 ELEVATION G/ C�) QD c� o p C-) co Q . 1. 1 64 i 61 x.50 7= 591.0 1 � 1 � • 1 589-59 o 0 p ----- ------- --L o----------- ------- ------'---------------- �"� `�' I 1 _ 1 1 1 601.18 1 1 . 1 / 607.51 tE 1 614.0 1 � . ` 1 515-3 1 t 4 t 1 t i i 1 t 1 p p p o 0 0 NOIIVA3�3 p p o 0 0 CONTRA COSTA COUNTY CEQA ENVIRONMENTAL CHECKLIST FORM I. Background 1. Name of Proponent: Contra Costa County Public Works Department 2. Address and Phone Number of Proponent: 255 Glacier Drive Martinez, CA 94553-4897 - (510) 313-2000 3. Date of Checklist Submitted: January 11, 1995 4. Name of Proposal, if applicable: Highland Road Bridge Replacement II. Environmental Impacts (Explanations of all significant, (S), answers are required on attached sheets.) .S 1. Earth. Will the proposal result in: a. Unstable earth conditions or changes in geologic substructures? _ ✓ b. Disruptions, displacements, compaction or overcovering of the soil? ✓ C. Change in topography or ground surface relief features? _ ✓ d. The destruction, covering or modification of any unique geologic or physical features? _ ✓ e. Any increase in wind or water erosion of soils, either on or off the site? ✓ f. Changes in deposition or erosion of beach sands, or changes in siltation, deposition or erosion which may modify the channel of a river or stream or the bed of the ocean or any bay, inlet or lake? ✓ g. Exposure of people or property to geologic hazards such as earthquakes, landslides, mudslides, ground failure, or similar hazards? ✓ 2. Air. Will the proposal result in: a. Substantial air emissions or deterioration of ambient air quality? _ ✓ *Please Note: "S" is for significant; "I" is for insignificant. 2 b. The creation of objectionable odors? _ ✓ C. Alternation of air movement, moisture, or temperature, or any change in climate, either locally or regionally? _ ✓ 3. Water. Will the proposal result in: a. Changes in currents, or the course of direction of water movements, in either marine or fresh waters? ✓ b. Changes in absorption rates, drainage patterns, or the rate and amount of surface runoff? ✓ C. Alterations to the course or flow of flood waters? ✓ d. Change in the amount of surface water in any water body? _ ✓ e. Discharge into surface waters, or in any alteration of surface water quality, including but not limited to temperature, dissolved oxygen or turbidity? _ ✓ f. Alteration of the direction or rate of flow of ground waters? _ ✓ g. Change in the quantity of ground waters, either through direct additions or withdrawals, or through interception of an aquifer by cuts or excavations? ✓ h. Substantial reduction in the amount of water otherwise available for public water supplies? _ ✓ i. Exposure of people or property to water related hazards such as flooding or tidal waves? _ ✓ 4. Plant Life. Will the proposal result in: a. Change in the diversity of species, or number of any species of plants (including trees, shrubs, grass, crops, and aquatic plants)? _ ✓ b. Reduction of the numbers of any unique, rare or endangered species of plants? _ ✓ C. Introduction of new species of plants into an area, or in a barrier . to the normal replenishment of existing species? ✓ d. Reduction in acreage of any agricultural crop? _ ✓ *Please Note: "S" is for significant; "I" is for insignificant. 3 5. Animal Life. Will the proposal result in: a. Change in the diversity of species, or numbers of any species of animals (birds, land animals including reptiles, fish and shellfish, benthic organisms or insects)? _ ✓ b. Reduction of the numbers of any unique, rare or endangered species of animals? _ ✓ C. Introduction of new species of animals into an area, or result in a barrier to the migration or movement of animals? _ ✓ d. Deterioration to existing fish or wildlife habitat? _ ✓ 6. Noise. Will the proposal result in: a. Increases in existing noise levels? _ ✓ b. Exposure of people to severe noise levels? _ ✓ 7. Light and Glare. Will the proposal produce new light or glare? _ ✓ 8. Land Use. Will the proposal result in a substantial alteration of the present or planned land use of an area? _ ✓ 9. Natural Resources. Will the proposal result in: a. Increase in the rate of use of any natural resources? _ ✓ 10. Risk of Upset. Will the proposal involve: a. A risk of an explosion or the release of hazardous substances (including, but not limited to, oil, pesticides, chemicals or radiation) in the event of an accident or upset conditions? _ ✓ b. Possible interference with an emergency response plan or an emergency evacuation plan? _ ✓ 11. Population. Will the proposal alter the location, distribution, density, or growth rate of the human population of an area? _ ✓ "Please Note: "S" is for significant; 811" is for insignificant. 4 12. Housing. Will the proposal affect existing housing, or create a demand for additional housing? _ ✓ 13. Transportation/Circulation. Will the proposal result in: a. Generation of substantial additional vehicular movement? — ✓ b. Effects on existing parking facilities, or demand for new parking? _ ✓ C. Substantial impact upon existing transportation systems? _ ✓ d. Alterations to present patterns of circulation or movement of people and/or goods? ✓ e. Alterations to waterborne, rail or air traffic? _ ✓ f. - Increase in traffic hazards to motor vehicles, bicyclists or pedestrians? _ ✓ 14. Public Services. Will the proposal have an effect upon, or result in a need for new or altered governmental services in any of the following areas: a. Fire protection? _ ✓ b. Police protection? _ ✓ C. Schools? ✓ d. Parks or other recreational facilities? ✓ e. Maintenance of public facilities, including roads? ✓ f. Other governmental services? ✓ 15. Energy. Will the proposal result in: a. Use of substantial amounts of fuel or energy? ✓ b. Substantial increase in demand upon existing sources of energy, or require the development of new sources of energy? _ ✓ 16. Utilities/Service Systems. Will the proposal result in a need for new systems, or substantial *Please Note: "S" is for significant; "I" is for insignificant. 5 alterations to the following utilities? a. Power or natural gas? ✓ b. Communications systems? — ✓ C. Water? — ✓ d. Sewer or septic tanks? _ ✓ e. Storm water drainage? _ ✓ f. Solid waste and disposal? _ ✓ 17. Human Health. Will the proposal result in: a. Creation of any health hazard or potential health hazard (excluding mental health)? _ ✓ b. Exposure of people to potential health hazards? ✓ 18. Aesthetics. Will the proposal result in the obstruction of any scenic vista or view open to the public, or will the proposal result in the creation of an aesthetically offensive site open to public view? _ ✓ 19. Recreation. Will the proposal result in an impact upon the quality or quantity of existing recreational opportunities? _ ✓ 20. Cultural Resources. a. Will the proposal result in the alteration of the destruction of a prehistoric or historic archaeological site?. _ ✓ b. Will the proposal result in adverse physical or aesthetic effects to a prehistoric or historic building, structure, or object? ✓ C. Does the proposal have the potential to cause a physical change which would affect unique ethnic cultural values? _ ✓ d. Will the proposal restrict existing religious or sacred uses within the potential impact area? _ ✓ *Please Note: "S" is for significant; "I" is for insignificant. 6 21. 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 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 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? b. Does the project have impacts which are individually limited, but cumulatively considerable? (A project may impact on two or more separate resources where the impact on each resource is relatively small, but where the effect of the total of those impacts on the environment is significant.) _ ✓ C. Does the project have environmental effects which will cause substantial adverse effects on human beings, either directly or indirectly? _ ✓ 111. Discussion of Environmental Evaluation. (see attached supplement) IV. Determination On the basis of this Checklist and Environmental Evaluation: ❑ 1 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 in Exhibit"A"have been added to the project. A NEGATIVE DECLARATION WILL BE PREPARED. ❑ I find the proposed project MAY have a significant effect on the environment, and an ENVIRONMENTAL IMPACT REPORT is required. Date 'Signatur Reviewed By: Mmat `Please Note: "S" is for significant; "1" is for insignificant. ENVIRONMENTAL EVALUATION Highland Road Bridge Replacement The project consists of the replacement of the present two lane bridge over Tassajara Creek at Highland Road (see Figures 1 3). The project also includes the realignment of approximately 400 ft. of Highland Road to conform with the new bridge, removal of the existing bridge, and acquisition of approximately three-quarters of an acre for right-of--way purposes. The existing bridge will remain open during construction of the replacement bridge. In the process of preparing the Checklist and conducting the evaluation, the following references(which are available for review at the Public Works Department located at 255 Glacier Drive, Martinez, except where otherwise noted)were consulted: REFERENCES: 1. Contra Costa Resource Mapping System (available at the Community Development Department, 651 Pine Street, 2nd Floor, North Wing, Martinez., CA 94553). 2. The County General Plan and EIR on the General Plan (January 1991) 3. RAREFIND -California Natural Diversity Data Base (September 30, 1994) 4. U.S. Fish and Wildlife Service Species List for the Proposed Highland Bridge Replacement Project (June 15, 1994) 5. Field Reviews (May 18, 1994, October 13, 1994, and November 14, 1994) 6. Sonoma State University-Archaeological Survey (October 10, 1994) 1. Earth (A- G) According to the County Resource Mapping System, Conejo clay loam with a 0 to 2 percent slope and no hazard of erosion is found in the project area. Realigning the roadway, installing a new bridge, grading the steep slope on the east bank of the creek to a 1.5:1 slope (see Figure 4), and placing rock slope protection on the creek banks will result in a minor change in topography. These activites will also-increase the exposure of soils to water and wind erosion during construction, but this impact is insignificant and temporary. Adherence to standard dust control and erosion control practices during construction, including, but not limited to, general watering of exposed areas and/or use of chemical stabilizers will minimize erosion impacts. These measures shall be incorporated into the construction contract. The project will not result in unstable earth conditions or changes to the geologic substructure, nor will it increase the exposure to geologic hazards. No unique geologic features are present within the project limits. The project is not expected to result in modifications to the channel of any waterway as a result of changes in deposition or erosion. Construction of the new bridge, drainage spillways, and removal of the existing bridge shall occur during periods of low or no flow to avoid erosion'of soils. See#3 -Water for a complete description of water protection measures. SUPPLEMENTAL EVALUATION Highland Road Bridge Replacement Page 2 2. Air (A-B) Short-term emissions and objectionable odors are generated during construction activities, but they are minor and temporary. To minimize this impact, contract specifications shall stipulate the use of properly tuned and muffled equipment. Air-quality impacts will also be reduced by eliminating unnecessary idling of machines when not in use. These measures could reduce construction period emissions.by up to 50 percent. Implementation of dust control practices noted in#1- Earth (A- G), will also minimize air quality impacts. (C) Realigning the roadway, installing the new bridge, and removing the existing bridge and roadway will not cause an alteration of climate, air movement, moisture, or temperature. 3. Water (A-1) Highland Road bridge crosses over Tassajara Creek(see Figures 2 -3). According to the Contra Costa Resource Mapping System, the project area is in a flood hazard area. However, replacing the bridge and realigning the roadway will not increase the exposure of people or property to flooding since the new bridge will cross the creek in a single span thereby eliminating the need for bents in the creek. In addition, the project will not impair the flow of water in marine or fresh waters, nor will it alter the course or flow of flood waters. Existing roadside drainage ditches will be modified to drain the realigned roadway and discharge into Tassajara Creek. The rate and amount of runoff is not expected to substantially increase due to the project's impervious surface area. Construction of the replacement bridge and removal of the existing bridge shall occur during periods of low or no flow (e.g. April to October) to avoid water quality impacts. If water is present, the construction area shall be de-watered by installing cofferdams and diverting water through a pipe, around the work site, to be discharged downstream in a non-erosive manner. During construction, sediment traps and/or filters shall be installed on an as needed basis and construction mats shall be used as needed, minimizing water• quality impacts. Standard construction safety practices shall be followed in order to reduce the possibility of a spill of gasoline, oil, or other pollutants which have a significant impact on water quality. 4. Plant (A-D) The County Resource Mapping System, field reviews, USFWS Species List, and RAREFIND showed no unique,threatened, or.endangered species of plants in the project area. Plant life in the project area consists of pasture land, riparian vegetation, and oak trees along the roadways. Approximately four trees.(a 28-inch diameter at breast height. (dbh) coast live oak, a 6-inch dbh valley oak, a 26-inch dbh valley oak, and 24-inch/18- inch dbh multiple trunk valley oak) may be removed from the riparian area; and, another SUPPLEMENTAL EVALUATION ' Highland Road Bridge Replacement Page 3 nine trees(coast live oak and valley oak)with dbh ranging from one to four inches and two walnut orchard trees may be removed to allow for, the road alignment and bridge construction (see Figure 3). Oak trees shall be replaced with same species (one-gallon size) at a 3:1 ratio (i.e., three trees planted for each one removed). Disturbed areas will be hydroseeded with native grasses and flowers. In addition, no construction activities will . take place in the area designated as"Environmentally Sensitive Area"on the project plans. As mentioned in#3-Water(A-1), construction mats shall be used as needed, minimizing impacts to plant life. The project will not create a barrier to the normal replenishment of existing species. A portion (approximately three-quarters of an acre) of a 9.15 acre parcel, which is under Williamson Act contract, will be acquired for right-of-way purposes. The parcel will continue to be viable agricultural land even reduced to approximately 8.4_acres. Approximately two walnut trees will be removed from the orchard within the project limits, however, this will not result in the significant reduction of any agricultural crop. 5. Animal Life (A - D) The project will not encroach upon the habitat of any unique, threatened or endangered species of animals according to the County Resource Mapping System, field reviews, USFWS Species List, and RAREFIND. The project area will be surveyed for the California tiger salamander and the red-legged frog by qualified personnel prior to construction, even though they are not commonly found in streams or creeks. The California tiger salamander breeds primarily in vernal pools and.other temporary ponds (rarely in streams), while the red-legged frog breeds in or near permanent water. The removal of pasture land and several trees (see Figure 3)will not have a significant effect on animal life, since they do not provide habitat for any unique, threatened or endangered species of animals. Trees removed as a result of the project will be replaced at a 3:1 ratio and exposed areas will be hydroseeded, which will provide some habitat for animals. No new species of animals will be introduced into the area as a result of the project. In addition, there will be no removal of fish or wildlife habitat. 6. Noise (A&B) The County Resource Mapping System for the project area indicate a noise level of 65 dBA along Camino Tassajara for the year 2005. No noise levels were indicated for Highland Road. The dominant source of noise in the project area comes from vehicles using Camino Tassajara and Highland Road (see Figure 2). The project will not significantly increase the capacity of the roadway. The realigned roadway will be moved closer to a residence on Highland Road, however the project will not result in a noise increase of more than 6 decibels,nor will the noise standard of 60 dB at the exterior of the residence be exceeded, therefore, no significant impacts will result from the proposed project(per General Plan EIR pp. 4.6-80-81). In general, construction activities produce noise levels of 86 dBA at 50 feet which is well below the threshold of pain of 120-140 dBA. SUPPLEMENTAL EVALUATION Highland Road Bridge Replacement Page 4 Best management practices noted in#2-Air(A&B), and limiting work hours to 7:30 a.m. 5:00 p.m., Monday through Friday, unless modified upon written approval, reduce construction noise levels and shall be incorporated as part of the construction contract. 7. Light and Glare Replacing the Highland Road bridge and the realignment of Highland Road will not produce a significant amount of new light or glare. 8. Land Use Replacing the Highland Road Bridge and realigning the roadway will increase the safety at the Highland Road crossing of Tassajara Creek and will not significantly increase the capacity outside of the project limits. The project will not result in a substantial alteration of the present or planned land use of an area. The existing land use within the project limits is agricultural, including a walnut orchard on the west side of Tassajara Creek and pasture land on the east side of the creek. The parcel is classified as prime agricultural land and is currently under a Williamson Act Contract. The project will change a portion (approximately three-quarters of an acre)of the 9.15 acre parcel to public right-of-way(see Figure 3). The portion of the parcel to be acquired is along the northern boundary of the property, therefore, the remaining 8.4 acre parcel will be contiguous and continue to be viable agricultural land. The land owner will be compensated for the loss of property. The project is consistent with the County General Plan Goal #5-A (To provide a safe, efficient and balanced transportation system), Goal #5-B (To coordinate the provision of streets, roads, transit and trails with other jurisdictions), Policy#5-8 (Existing circulation facilities shall be improved and maintained by eliminating structural and geometric design deficiencies), Policy#5-16 (The design and the scheduling of improvements to arterials and collectors.shall give priority to safety over other factors including capacity), and Measure #10-t (Encourage the County Flood Control District to proceed with drainage improvements in areas subject to flooding from inadequate facilities, and to ensure that additionalnew drainage facilities, including road culverts and bridges, are designed to pass the flow specified by County Ordinance Code). 9. Natural Resources During construction the project will use paving materials (i.e. asphalt) which will not significantly impact this resource. The use of oil and gasoline to operate the machinery for construction purposes is negligible and_of.a short-term, temporary nature. Best management practices noted in #2 - Air will minimize the. consumption of natural resources. SUPPLEMENTAL EVALUATION Highland Road Bridge Replacement Page 5 10. Risk of Upset (A) The project has the potential to release hazardous substances, such as accidental petroleum spills, during construction. Per specifications, standard construction safety practices shall be followed during construction to ensure no accidental release of hazardous substances or increase the potential for exposure to these substances. The County Resource Mapping System for the project area did not identify any petroleum pipelines or electric transmission lines. (B) The project has the potential for interfering with an emergency response. However, emergency response agencies and the general public will be notified prior to the onset of construction. The existing bridge will remain open during construction of the replacement bridge. Traffic may be diverted within the proposed right-of-way during construction of the new Highland Road/Camino Tassajara intersection and the segment of roadway where the existing Highland Road conforms to the realigned roadway. Standard specifications require installing sufficient signs warning about the construction and work hours will be restricted as mentioned in#6- Noise (A- B). 11. & 12. Population & Housing The project will,not result in a change in the location, distribution, density, or growth rate of human population in the area. The project will not affect existing housing, or create a demand for additional housing. As mentioned in #8 Land Use, replacing the Highland Road Bridge and realigning the roadway will increase the safety at the Highland Road crossing of Tassajara Creek and will not significantly increase the capacity outside of the project limits. 13. Transportation and Circulation (A-F) Highland Road is defined as an existing collector roadway in the County's General Plan. The project involves replacing the Highland Road Bridge and realigning approximately 400 ft. of Highland Road (see Figure 3). The existing two-lane, 21 ft. wide bridge and 20-ft. wide approach road and geometrics are substandard with respect to current standards in width and railing type. The existing bridge, which was built in 1930, is eligible for replacement under the Federal Highway Bridge Rehabilitation and Replacement(HERR)program. While the 32 ft. wide replacement bridge and 30 ft. wide realigned.roadway will increase the safety on Highland Road, it will not significantly increase the capacity. The project is consistent with the Transportation and Circulation Element of the General Plan (see#8-Land Use). Replacing the bridge and realigning the road will not generate additional traffic, except during construction when vehicles associated with those activities utilize the local street system; however, the amount of additional traffic is insignificant. The average daily vehicle trips 899 on Highland Road and approximately 5,100 on Camino SUPPLEMENTAL EVALUATION Highland Road Bridge Replacement Page 6 Tassajara. The project has the potential for interfering with an emergency response (see #10 - Risk of Upset). No work shall be performed between 5:00 a.m. and 8:30 a.m., nor between 4:30 p.m. and 6:30 p.m. which could interfere with commute traffic on Camino Tassajara. In addition, no work which could interfere with commute traffic on Highland Road shall be performed between 6:00 a.m. and 8:30 a.m., nor between 4:30 p.m. and 6:30 p.m. The project will not alter waterborne, rail or air traffic as no water, rail or air transportation and facilities are located in the immediate vicinity of the project area. 14. Public Service (A-D, F)The bridge replacement and road realignment will not increase the need for fire or police protection, schools, parks, or other governmental services. - (E) Highland Road is currently maintained by the County.. Periodic maintenance of road improvements will continue to be performed by the County. 15. , Energy Minor amounts of non-renewable fuel resources will be consumed-during construction, but this is a short-term, temporary and minor impact. Eliminating unnecessary idling of machines when not in use and using properly tuned equipment, as mentioned in#2 -Air (A-C) minimize the consumption of energy resources. 16. Utilities The project will result in the relocation of some utilities and all relocation activities shall be coordinated with the appropriate utility agencies. 17. Human Health The project has the potential to release hazardous substances during construction. Potential health hazards due to accidental petroleum spills shall be minimized by following best management practices noted in #10- Risk of Upset (A). Air quality impacts, which could affect human health, can be minimized by the measures noted in#2 -Air (A& B). The project will not create any known health hazard or increase the potential for exposure. 18. Aesthetics Highland Road has been identified as a scenic route in the County's General Plan. As mentioned in#4-Plants, several trees above the creek, as well as, a few oak trees along Highland Road and Camino Tassajara will be-r..emoved as a result of the roadway SUPPLEMENTAL EVALUATION Highland Road Bridge Replacement . Page 7 realignment (see Figure 3). The residence on Highland Road may become visible from Camino Tassajara as a result of tree being removed, however this is not a significant impact since the residence is more than 500 ft. from Camino Tassajara. The scenic view will be conserved to the extent possible, per General Plan Policy#5-36 (Scenic views observable from scenic routes shall be conserved, enhanced, and protected to the extent possible) and Measure#5-al (Consider the visual qualities and character of the corridor in reviewing plans for new roads, road improvements, or other public projects. This should include width, alignment, grade, slope...). Design alternatives, which could have avoided some of the trees, were determined to be infeasible, based on safety, engineering, and cost considerations. Since the trees will be replaced at a 3:1 ratio, no significant impacts will result from the project. The sight of construction equipment may be visually unattractive, but this is a minor, short-term and temporary impact, ending upon completion of construction. 19. Recreation The County Resource Mapping System and the field reviews did not identify any recreational opportunities in the project area. 20. Cultural Resources (A- D) The County General Plan has designated Tassajara Creek as a highly sensitive area because of the probability of archeological sites along permanent and seasonal streams. However, according to the County Resource Mapping System and a records search of the Northwest Information Center at Sonoma State University, no historical or archaeological sites exist in the project vicinity. The contract specifications shall include measures related to discoveries of cultural resources. 21. Mandatory Findings of Significance (A - C) Due to construction equipment, air quality may be temporarily degraded at the project site. However, no permanent long-term impacts will result (see #2 - AIR). No endangered species of plants or animals are within the project area. There will be no encroachment upon any habitat or elimination of any animal, fish, or wildlife community (see #4 - Plant Life and #5 - Animal Life). The project does not have the potential of eliminating examples of the major periods of California history or prehistory (see #20 - Cultural Resources). There are no cumulative impacts associated with the project. -In addition, there will be no adverse environmental effects.on human beings (see #17 - Human Health). m cNghlendlbridge.sup