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HomeMy WebLinkAboutMINUTES - 08132002 - C13 _. _. 4. TO: BOARD OF SUPERVISORS i /3 FROM: MAURICE M. SHIU, PUBLIC WORKS DIRECTOR DATE: August 13, 2002 SUBJECT: DETERMINE that the Horizontal Drain Replacement 2002 project is a California Environmental Quality Act, Class ld Categorical Exemption; APPROVE the project; and AUTHORIZE the Public Warks Director to advertise the project, Richmond area. [CDD-CP #02-50] (District I) Project No. 0672- 6U2531-02 pecific Requests}or Recommendation(s)&Background I Justffication I. RECOMMENDED AC`T'ION. DETERMINE that the Horizontal Drain Replacement 2002 project is a California Environmental Quality Act (CEQA)'Class I d Categorical Exemption; and DIRECT the Director of Community Development to file a Notice of Exemption with the County Clerk; and AUTHORIZE the Public Works Director to arrange for payment of a $25 fee to Community Development for processing, and a$25 fee to the County Clerk for filing the Notice of Exemption; and APPROVE the project;and AUTHORIZE the Public Works Director to advertise the project. 9001� Continued on Attachment: ,X SIGNATURE: RECOMMENDATION OF COUNTY ADMINISTRATOR ,'ZECOMMENDATION OF BOARD COMMITTEE PROVE OTHER SIGNATURELS"j, " r ACTION OF BIA ON AUGUST 13, 2002 APPROVED AS RECOMMENDED XX OTHER s VOTE OF SUTERVISORS xX UNANIMOUS(ABSENT None ) AYES: NOES: ABSENT: ABSTAIN: CN:sr G:\EngSvc\ENVIROBO\2002\(0$-13-02) I hereby certify that this is a true and correct copy of an action,taken CEQA-Horizontal Drain Replacernent.doe and entered on the minutes of the Board of Supervisors on the date Orig.Div: Public Works(Environmental) shown. Contact: Crystal Najera(313-2190) cc: Adtninistrator-Attn: E.Kuevor Auditor-Controller ATTESTED: AUGUST 13 2102 Community Development -K Piona JOHN SWEETEN,Clerk of the Board of Supervisors and County Public Works: Accounting -E.Scudero Administrator Maintenance -T.Jensen -M.De la O fly - Eng.Svc -C.Sellgren Deputy -L.Chavez -T.Torres __ _ _. .. SUBJECT: DETERMINE that the Horizontal Drain Replacement 2002 project is a California Environmental Quality Act, Class Id Categorical Exemption; APPROVE the project, and AUTHORIZE the Public Works Director to advertise the project, Richmond area. [CDD-CP #02-50] (District I) Project No. 0672- 602531-02 DATE: August 13,2002 PAGE: 2 IL FINANCIAL IMPACT: The estimated project cost for the project is $70,000, funded by Local Roads Funds (100%). III. REASONS FOR RECOMMENDATION/BACKGROUND: This project will repair existing damaged public facilities. The repairs will not involve an expansion of use beyond that which was previously existing nor result in the removal of any scenic resources. This project has been determined to be exempt from General Plan Conformance review. The project consists of replacing five horizontal drains below San Pablo Darn Road that have become ineffective due to internal damage and installing two new horizontal drains below Wildcat Canyon Road in an area of ongoing landslide movement. There will be a total of four sites where drilling will occur. (Figure 2-3) At each site a tractor-mounted portable drill rig will be driven down existing access roads and parked perpendicular to the drill location. Rigs will remain in place at each site until the installation operation is complete,thus requiring minimal passes along the access roads. Drill operation is a combination of mechanical drilling and the use of water as a lubricant to break up the soil. The PVC pipe is extended into the soil as drilling occurs. The horizontal drains consist of small diameter (2")slotted PVC pipes. The pipes are drilled into the base of the embankment and extend between 150 and 500 feet into the hill. Upon completion of the project,the drill rigs will be driven out of the sites and the sites will remain in essentially the same condition as they were prior to the drain replacements. The first site for horizontal drain replacement is just uphill from a small, unnamed creek. In order to provide adequateaccess to install the drains at the required angle, a small amount of rock fill (approx. 44 cu. yd.)will need to be placed on the west bank to stabilize and widen the access road. Containment and settling basins will be constructed at all sites using filter fabric and hay bales to allow spoil (slurry of water and soil produced by drilling activity)to collect, filter water and dry before removal. Collected spoil material will be disposed of at an offsite upland location. Since Site 1 is near a small creek, a three-tier containment system will be implemented to ensure that the spoil material does not enter the creek or reservoir. The water pump will be on-hand at all drill locations to ensure that any excess water is directed to a safe drying area that won't cause excess erosion. Access authorizations from EBMUD will be required. It will take approximately 2 days to install each horizontal drain. The entire project will take approximately 14 working days to complete. IV. CONSEQUENCES OF NEGATIVE ACTION: Delay in approving the project may jeopardize funding and will result in a delay of construction. CONTRA PUBLIC WORKS DEPARTMENT COSTA INITIAL STUDY COUNTY OF ENVIRONMENTAL SIGNIFICANCE PROJECT# 0672-6U2531-02 CP# 02-50 PROJECT NAME: Horizontal Drain Replacement 2002 PREPARED BY: Crystal Najerad DATE: July 3, 2002 APPROVED BY: C <`;7G DATE: RECOMMENDATIONS: (X) Categorical Exemption (Class 1d) ( ) Negative Declaration ( ) Environment Impact Report Required { ) Mitigated Negative Declaration The project will not have a significant effect on the environment. The recommendation is based on the following: This project consists of the repair of an existing damaged public facility. The repair will not involve the expansion of use beyond that previously existing nor result in the removal of any scenic resource. What changes to the project would mitigate the identified impacts: N/A USGS Quad Sheet Briones Valley Base Map Sheet# M-8, N-8 Parcel # N/A GENERAL CONSIDERATIONS: 1. Location: The project is located at various sites, three along Old San Pablo Dam Road just down slope of the roadway and one along Wildcat Canyon Road just below Inspiration Point. All sites are in the general area northwest of Orinda. (Figure 1) 2. ProjectDescription: The project consists of replacing five horizontal drains that have become ineffective due to internal damage and installing two new horizontal drains in an area of ongoing landslide movement. The original drains were installed in order to remove excess water from the hillside below San Pablo Dam Road and potentially prevent landslides and the need to repair the road. The horizontal drains consist of small diameter (2") slotted PVC pipes. The pipes are drilled into the base of the embankment and extend between 1501 and 500 feet into the hill. There will be a total of four sites where drilling will occur. Site 1 includes replacement of three drains (Drains #104, 105, and 106); one drain will be replaced at Site 2 (Drain #82); one drain will be replaced at Site 3'(Drain #681); and at Site 4, two new drains will be installed alongside existing drains (Figure 2- 3). At each site a tractor-mounted portable drill rig will be driven down existing access roads and parked perpendicular to the drill location. Rigs will remain in place at each site until the installation operation is complete, thus requiring minimal passes along the access roads. Drill operation is a combination of mechanical drilling and the use of water as a lubricant to break up the soil. The PVC pipe is extended into the soil as drilling occurs. Upon completion of the project, the drill rigs will be driven out of the sites and the sites will remain in essentially the same condition as they were prior to the drain, replacements and installments. Access to each drill site will occur on existing East Bay Municipal Utility District(EBMUD) access roads. Minor maintenance including grading and scraping of roads and trimming of tree branches and brush may be necessary along portions of the access roads in order to allow for ease of access to the drill _.... . sites and for future maintenance of horizontal drains in the area. Specifically, access roads leading to horizontal drains at Site 2, and to drains at Site 5 will need to be re-bladed with a bulldozer. Removal of one small oak tree (3"dbh) and minor trimming of a larger oak tree will also be necessary at Site 2 in order to clear a path for access. Once grading and drill work is complete the access roads will be hydroseeded for erosion control. The first site for horizontal drain replacement is just uphill from a small, unnamed drainage. The access road to the horizontal drains terminates at the west bank of the drainage. There is approximately 13 feet of clearance between the drill point on the hillside and the channel bank. In order to provide adequate access to install the drains at the required angle, a small amount of rock fill (approx. 44 cu. yd.) will need to be placed on the west bank to stabilize and widen the access road. The rock will also serve to effectively stop erosion occurring at the bottom of the access road. Drilling operations at sites 1 and 4 will result in approximately 0.8 cubic yards of spoil (excess soil and water) per drill hole. Sites 2 and 3 will produce about 0.3 cubic yards of spoil per drill hole. Treatment of spoil will vary depending on the layout and proximity of the various sites. Containment and settling basins will be constructed at all sites using filter fabric and hay bales to allow spoil material to collect, filter water and dry before removal. Collected spoil material will be disposed of at an offsite upland location. In the event any of the containment systems are overwhelmed, a backup filtering method utilizing'a water pump will be employed. The water pump will be on-hand at all drill locations to ensure that any excess water is directed to a safe drying area that won't cause excess erosion. Since Site 1 is located adjacent to a drainage, a three-tier system for spoil containment will be constructed at this site (Figure 4). The first tier will consist of a filter fabric basin stabilized with metal posts and wire mesh and will be built around the riprap area just below the drill site. This system is expected to be more than adequate to contain the predicted 2.4 cubic yards of spoil material. The secondary and tertiary containment systems will consist of, respectively, wattles secured along the right bank of the creek to protect the channel and across the flowline of the channel at a downstream location to ensure that no sediment-laden water reaches the reservoir. For additional protection, if necessary, excess wafter will be pumped to a depression area to the west of the drainage. Dewatering of the drainage will not be necessary since the drain installation activities will not encroach on the drainage due to the low flow condition during the dry season and the implementation of the three-tier filtering system that will also function to separate the work area from the drainage. Site 2 is located well upslope of an EBMUD picnic area and is not located near any drainage or waterway. Site 2 also has an adjacent flat area large enough to construct the spoil containment system. Site 3 is adjacent to an EBMUD paved parking lot. The drill rig will be able to park on the pavement during operation. The spoil containment system will be constructed adjacent to the drill location and the pavement. A small cluster of 2-3 foot tall willow shoots will need to be trimmed to ground level in order to provide room for the containment system. Since the willows will not be removed, they will re-sprout the following wet season. At site 4, a small man-made depression will be used for spoil containment. This depression was originally formed to allow the horizontal drain runoff water a place to filter into the embankment. The access road leading to the area will be re-graded and the depression will be excavated deeper in order to provide sufficient containment. A few branches of willow will be trimmed to allow access for the minor excavation. After completion of the drilling at Site 4, the depression will be restored to roughly its original contours and the spoil material will be hauled to an offsite location. Environmentally Sensitive Area (ESA) fencing will be installed as the first order of work at all sites to clearly define the project limits and area of impact. In addition, Best Management Practices (BMPs) will be utilized throughout the course of the project. The work site will be maintained in a clean condition on a daily basis. The repair activity will be kept to the minimum necessary to accomplish the repair. Fueling and maintenance of equipment will occur at designated staging areas. The drill sites are within the Alameda whipsnake (Masticophis lateralis euryxanthus) Critical Habitat designation; however the County plans to repair the drains during August or later so as to minimize any potentialimpacts to the whipsnake. In addition, the County will work with EBMUD biologists to further ...................... _. avoid impacts. A qualified biologist will perform pre-construction surveys for Alameda whipsnake. ©rill rigs will',be making only minimal passes to each site and will drive with caution along the access roads. All spoil material will be contained and removed and will not create any permanent impacts to the surrounding habitat. With these precautions in place, impacts to the Alameda whipsnake are not expected to occur. Two of the sites are located near water sources that may be suitable habitat for red-legged frog (Rana aurora draytonil). Repairs will be done during the dry months (August-October) to avoid impacts to red- legged frog. When constructing containment systems at these sites, workers will take all precautions necessary to avoid impacts. In order to minimize any potential impacts, pre-construction surveys for red-legged frogs will be performed by a qualified biologist within two weeks of initiation of construction and the drainage near Site 1 will be avoided to the extent feasible. Construction activities will occur on existing access roads, thus red-legged frog are not expected to be impacted by this activity. The County will also work with EBMUD biologists to ensure effective precautions have been taken to avoid red-legged frog impact. Accessauthorizations from EBMUD will be required. It will take approximately 2 days to install each horizontal drain. The entire project will take approximately 14 days to complete. 3. Does it appear that any feature of the project will generate significant public concern? [ ] yes [X] no [ ] maybe (Nature of concern): 4. Will the project require approval or permits by other than a County agency? [X] yes [ ] no Agency Name(s): CDFG (1601 Permit), USAGE (CWA section 404 Nationwide permits)', RWQCB (CWA section 401 Water Quality Certification), coordination with USFWS, access from EBMUD 5. Is the project within the Sphere of Influence of any city? No. cNIC GAEngSvc\ENVIR0\2002 Projects\CEQAtCat.Ex\Horiz Drain Replacernent(IS)Aoc _. _. _.. ... . CALIFORNIA ENVIRONMENTAL QUALITY ACT 0 1%N0tiee of Exemtion Contra Costa County Community Development Department 651 Pine Street,4th.Floor-Forth Wing, McBrien Administration Building Martinez, CA 94553-0095 Telephone: (925) 313-2190 Contact Person: Crystal Naiera, Planner Project Description, Common dame (if any) and Location: 2002 Horizontal Drain Replacement, County File #CP 02-50: Project Description:The project consists of replacing five horizontal drains that have become ineffective due to internal damage and installing two new horizontal drains in an area of ongoing landslide movement. The original drains were installed in order to remove excess water from the hillside below San Pablo Dam Road, potentially preventing landslides and the need to repair the road. The horizontal drains consist of small diameter(2")slotted PVC pipes. The pipes are drilled into the base of the embankment and extend between 150 and 500 feet into the hill. There will be a total of four sites where drilling will occur. At each site a tractor-mounted portable drill rig will be driven down existing access roads and parked perpendicular to the drill location. Rigs will remain in place at each site until operation is complete,thus requiring minimal passes along the access roads. Drill operation is a combination of mechanical drilling and the use of water as a lubricant to break up the soil. The PVC pipe is extended into the bank as drilling occurs. Upon completion of the project,the drill rigs will be driven out of the sites and the sites will remain in the same condition as they were prior to the work. Minor maintenance including grading and scraping of roads and trimming of tree branches and brush may be necessary along the portions of the access roads in order to allow for ease of access to the drill sites and for future maintenance of horizontal drains in the area. In order to properly install the drains at site 1,a small amount of riprap(44 cu.yd.)will be placed on the west bank of a nearby drainage to stabilize and widen the access road. The rock will also serve to prevent bank erosion. Drilling operation at Sites 1 and 4 will result in approximately 0.8 cu.yd.of spoil(excess soil and water)per drill hole. Sites 2 and 3 will produce about 0.3 cu.yd.of spoil per drill hole. Containment and settling basins will be constructed at all sites using filter fabric and hay bales so as to allow spoil material to collect,filter water and dry before removal. Collected spoil material will be disposed of at an offsite location. In the event the containment system is overwhelmed,a backup method utilizing a water pump will be employed. Best Management Practices(BMPs)will be utilized throughout the course of the project. The drill sites are within Alameda whipsnake(Masticophis lateralis euryxanthus)USFWS critical habitat. Some nearby habitat may be suitable for red-legged frog. The County will take necessary precautions to ensure that impacts to the Alameda whipsnake and red-legged frog are minimized. Precautions will include: timing construction to occur after August, during the dry months; coordinating preconstruction surveys with qualified biologists;taking minimal,slow passes along access roads;and containing and removing all spoil material. Project location: The project is located at various sites,three along Old San Pablo Dam Road just below San Pablo Clam Road and one along Wildcat Canyon Road just below Inspiration point. All sites are in the general area northwest of Orinda. (Figure 1) This project is exempt from CEQA as a: — Ministerial Project(Sec. 15258) — Other Statutory Exemption, Section Declared Emergency(Sec. 15269(x)) — General Rule of Applicability(Section 15061(b)(3) _ Emergency Project(Sec. 15269(b)or(c)) X Categorical Exemption,�Class I d for the following reason (s) : This project consists of the repair of an existing damaged public facility. The repairwill not involve the expansion of use beyond that previously existing nor result in the removal of any scenic resource. Date: By: Community Development Department Re resentative 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. Si nature Title Applicant: County Public Works department 255 Glacier Chive Martinez, CA 94553 Attn: Crystal Naiera County Clerk Fee $50 Due CN:LC G:\EngSvc\ENVIRO\2002 Projects\CEQA\NO \HorizontalDrainNOE (Rev. 2/97) CALIFORNIA ENVIRONMENTAL QUALITY ACT N. talcs of Exemption Contra Costa County Community Development Department 651 Pine Street, 4th Floor-North Wing, MCBrien Administration Building Martinez, CA 94553-0095 Telephone: (925) 313-2190 Contact Person: Crystal Naiere, Planner Project Description, Common Name (if any)and Location: 2002 Horizontal Drain Replacement, County File #CP 02-50: Project Description:The project consists of replacing five horizontal drains that have become ineffective due to internal damage and installing two new horizontal drains in an area of ongoing landslide movement. The original drains were installed in order to remove excess water from the hillside below San Pablo Dam Road, potentially preventing landslides and the need to repair the road. The horizontal drains consist of small diameter(2")slotted PVC pipes. The pipes are drilled into the base of the embankment and extend between 150 and 500 feet into the hill. There will be a total of four sites where drilling will occur. At each site a tractor-mounted portable drill rig will be driven down existing access roads and parked perpendicular to the drill location. Rigs will remain in place at each site until operation is complete,thus requiring minimal passes along the access roads. Drill operation is a combination of mechanical drilling and the use of water as a lubricant to break up the soil. The PVC pipe is extended into the bank as drilling occurs. Upon completion of the project,the drill rigs will be driven out of the sites and the sites will remain in the same condition as they were prior to the work. Minor maintenance including grading and scraping of roads and trimming of tree branches and brush may be necessary along the portions of the access roads in order to allow for ease of access to the drill sites and for future maintenance of horizontal drains in the area. In order to property install the drains at site 1,a small amount of riprap(44 cu.yd.)will be placed on the west bank of a nearby drainage to stabilize and widen the access road. The rock will also serve to prevent bank erosion. Drilling operation at Sites 1 and 4 will result in approximately 0.8 cu.yd.of spoil(excess soil and water)per drill hole. Sites 2 and 3 will produce about 0.3 cu.yd.of spoil per drill hole. Containment and settling basins will be constructed at all sites using alter fabric and hay bales so as to allow spoil material to collect,filter water and dry before removal. Collected spoil material will be disposed of at an offsite location. In the event the containment system is overwhelmed,a backup method utilizing a water pump will be employed. Best Management Practices(BMPs)will be utilized throughout the course of the project. The drill sites are within Alameda whipsnake(Masticophis lateralis euryxanthus)11SFWS critical habitat. Some nearby habitat may be suitable for red-legged frog. The County will take necessary precautions to ensure that impacts to the Alameda whipsnake and red-legged frog are minimized. Precautions will include: timing construction to occur after August, during the dry months; coordinating preconstruction surveys with qualified biologists; taking minimal,slow passes along access roads; and containing and removing all spoil material. Project location: The project is located at various sites,three along told San Pablo Dam Road just below San Pablo Dam Road and one along Wildcat Canyon Road just below Inspiration point. All sites are in the general area northwest of Orinda. (Figure 1) This project is exempt from CEQA as a: — Ministerial Project(Sec. 15268) — Other Statutory Exemption, Section — Declared Emergency(Sec. 15269(x)) _ General Rule of Applicability(Section 15061(b)(3) Emergency Project(Sec. 15269(b)or(c)) X Categorical Exemption, LQlass 1 d for the following reason (s) : This project consists of the repair of an existing damaged public facility. The repair will not involve the expansion of use beyond that previously existing nor result in the removal of any scenic resource. Date: By: Community_Development Department Representative AFFIDAVIT OF FILING AND POSTING 1 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. 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