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0 California Regional Water Quality Control Board <br /> Central Valley Region a <br /> ' <br /> Winston H.Hickox Robert Schneider,Chair <br /> Gray Davis <br /> Serrelaryfor Fresno Branch Office Garemnr <br /> Ervironmenral Inmernet Address: hnp://wvm.swrcb.a�.gnv/rwgrh5 <br /> pwmoian 1685 a St cot.Fresno.California 95706.2020 <br /> Phone(559)445-5116•PAX(559)445.591,0 <br /> 8 September 2003 Copy <br /> Mr.M. Scott Mansholt <br /> ChevronTexaco <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 (SAIL) 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 /> Ducting 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 reques d <br /> ' that ChevronTexaco prepare a workplan to characterize the extent of soil and groundwater impacts. <br /> Previous investigations for Cintra,Dividend,Dobler, McCormack,Mansfield/fiflos,Monterosso, Nickolaw, <br /> ' Souza, and Sudand 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 Surl.and Homes properly, <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 So <br /> and McCormack properties, and the area west of Interstate 205,within the easement along the south side o <br /> Byron Road. <br /> ' Phase l 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 /> ' %I Recycled Paper -� <br /> 71rc cn=fgy chaflcn8e faring California is rral. 8vcry Californian needs to talm ieunediate action to seduce energy consumption. <br /> For a list of simple ways You can reduce demand and cut your energy costs,see oar wclnslre at htgtt/Avww.ravrcb,c%gov/rwgcb5 <br />