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s 0 <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Winston H.Hickox Robert Schneider,Chair Gray y D Davis <br /> Secretary for Fresno Branch Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 <br /> Protection 1685 E Street,Fresno,California 95706-2020 <br /> Phone(559)445-5116•FAX(559)445-5910 HE E u�W F 1 <br /> 8 September 2003 <br /> SEP 0 9 2003 <br /> Mr. M. Scott Mansholt <br /> ChevronTexaco ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Chevron Environmental Management Company <br /> P.O. Box 6012 <br /> San Ramon, California 94583-2324 <br /> WORKPLAN REVIEW—WEST BYRON ROAD CORRIDOR, TRACY, SAN JOAQUIN COUNTY <br /> We have reviewed the Tracy Byron Road Soil and Groundwater Investigation Workplan West Byron Road <br /> Corridor, Tracy, CA submitted by Science Applications International Corporation (SAIC) on behalf of <br /> ChevronTexaco. The workplan encompasses a 7,000-foot parcel centered along Byron Road, which is lined <br /> on both sides by private residences, small commercial businesses, and agricultural land. <br /> During the 2003 installation of the City of Tracy stormwater drain pipeline beneath Byron Road, petroleum <br /> hydrocarbon-impacted soil and groundwater was encountered. Consequently, Regional Board staff requested <br /> that ChevronTexaco prepare a workplan to characterize the extent of soil and groundwater impacts. <br /> Previous investigations for Cintra,Dividend, Dobler, McCormack, Mansfield/Filios, Monterosso, Nickolaw, <br /> Souza, and Surland Homes generally cover much of the area described in the workplan. Subsequently, the San <br /> Joaquin County Environmental Health Department and/or the Central Valley Regional Water Quality Control <br /> Board issued No Further Action letters for the referenced properties, except for Surland Homes. Quarterly <br /> groundwater monitoring is currently being conducted on the Surland Homes property. <br /> Based on review of our records and the workplan, the previous investigations have not adequately <br /> characterized soil and groundwater conditions for parcels within the easement on the north side of the Souza <br /> and McCormack properties, and the area west of Interstate 205, within the easement along the south side of <br /> Byron Road. <br /> Phase 1 of the workplan proposes 33 borings to collect soil and groundwater samples from those areas not <br /> adequately characterized along Byron Road. <br /> We have the following comments to SAIC's workplan: <br /> 1. We concur with the consultants proposal to advance additional borings north of the McCormack <br /> property within the Byron Road easement to collect soil and groundwater samples for analysis. In <br /> addition, we recommend that groundwater samples be collected from approximately seven of the <br /> proposed borings, not containing free phase product (one sample each 300 linear feet). Analysis of <br /> California Environmental Protection Agency <br /> ea Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 <br />