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California Regional Water Quality Control Board <br /> e <br /> Central VaIIey Region <br /> _. <br /> Robert Schneider,Chair <br /> Terry Tamminen Fresno Branch Office ArttoldSchwarzenegger <br /> Sea etaty for (ntemet Address: http://w %v.swrcb.ca.8ov/.-rwgcb5 Governor <br /> Environmental 1685 E Street,Fresno,Califomia 93706.2020 <br /> Protection Phone(559)445.5116•FAX(559)445-5910 <br /> 19 April 2004 <br /> 1 <br /> Mr, M. Scott Mansholt <br /> ChevronTexaco <br /> Chevron Environmental Management Company <br /> P.O. Box 6012 <br /> San Ramon, CA 94583 <br /> REVIEW OF SOIL AND GROUNDWATER INVESTIGATION REPORT—BYRON ROAD <br /> ' PROJECT, WEST BYRON ROAD,TRACY,SAN JOAQUIN COUNTY <br /> Regional Board staff have reviewed the 18 February 2004 Soil and Groundwater Investigation Report, <br /> A' <br /> Byron Road, West Byron Road Tracy, San Joaquin County, prepared for ChevronTexaco by Science <br /> Applications International Corporation (SAIC). Additionally, we reviewed previous soil and groundwater <br /> investigation reports conducted by SAIC and others from 1996 to 2003 for predecessors of <br /> ChevronTexaco. <br /> Detailed continents are provided in the attached memorandum and summarized below: <br /> • Petroleum hydrocarbons have impacted soil and groundwater at several site locations <br /> along the south side of West Byron Road. The vertical extent of impacted soil and <br /> groundwater has been determined to be between approximately 20 and 36 feet. <br /> ' • The lateral extent of impacted soil and groundwater has not been a. n Y <br /> de uatel delineated <br /> upgradient(south)of generally nine different locations. Additional characterization is <br /> needed. <br /> • Soil and groundwater at adjacent downgradient(north) properties, with one exception <br /> 1 have been characterized and NFA(No Farther Action) determination issued for those <br /> sites. Two properties adjacent to the south side (upgradient)have also received NFA <br /> letters. <br /> California Environmental Protection Agency <br /> �b� Recycled Paper <br />