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California Reonal Water Quality Ontrol Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Terry Tamminen Fresno Branch Office Arnold Schwarzenegger <br /> Secretary for Internet Address: http://www.swreb.ca.gov/--rwgcb5 Governor <br /> Environmental 1685 E Street,Fresno,California 93706-2020 <br /> Protection Phone(559)445-5116•FAX(559)445-5910 <br /> 19 April 2004 APR 2 2 2004 <br /> ENVIi'lU IVIE0 HEALTH <br /> PERMIT/SERVICES <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 REPO'T—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 /> 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 comments 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 adequately 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 /> have been characterized and NFA (No Further 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 /> ca Recycled Paper <br />