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Ultk/ tl°Il. JUf KM) yL5 04G Ut5U6 Uy/ I I 'U3 'D:-^)( NV.-)')O Ue <br /> California Regional Water Quality Control Board <br /> 1 Central Valley Region <br /> Robert Schneider,Chair <br /> Winston It.tiickox Gray Amis <br /> ' Serreraty{or Fresno Branch Office Gaventor <br /> l7nvirnnmentol Internet Address: http://wNvwswreb.c.i.gov/t-wqrJ)5 <br /> rMrecfinn 1685 F Strect,Fresno,Caliromia 95706.2020 <br /> Phone(559)445-5116•FAX 0559)445-5910 <br /> $ September 2003 <br /> 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 /> WORXPLAN RI±VIEW—WEST BY"RON 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 Jntern.ational Corporation (SAIC)on behalf of <br /> ChevronTexaco. The workplan encompasses a 7,000-foot parcel centered along Byron Road, which is lined <br /> ' on moth 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 /> hydrodarbon-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 /> I 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 t of the p <br /> work ]an proposes 33 borings to collect soil and groundwater samples from those areas not <br /> p <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. Jn <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 Rnnironmenfal Protection Agency <br /> cycled Paprr <br /> 7110 cncr{�y chnllcn re facing California is resl L-vcry Califomwi needs to take immediate action to reduce energy consumption. <br /> For a IN of simple ways you can reduce detnnnd and cut your cncrgy corm,see our web-Fite at hap:/hvw+vs+vrcb.re,gov/rwgrb5 <br />