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California Regional Water Quality Control aril <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Terry Tamminen Fresno Branch Office Arnold Schwarzenegger <br /> Secreta}•for Internet Address: http://ww%%.s%%Tcb.ca.gov/—rwqcb5 Governor <br /> Enrironme+rtai 1635 E Street,Fresno,California 93706 <br /> Protection Phone(559)445-5116•FAx(559)445-5910 <br /> 29 September 2004 OCT 1 3 2004 <br /> Chevron Emriror;;ita1 t" ,r <br /> M. Scott Mansholt <br /> ChevronTexaco <br /> Chevron Environmental Management Company <br /> ' 6001 Bollinger Canyon Road <br /> P.O. Box 6012 <br /> San Ramon, CA 94583-0712 <br /> REVIEW OF ADDITIONAL SOIL AND GROUNDWATER INVESTIGATION WORKPLAN, <br /> TRACY BYRON ROAD PROJECT, TRACY, SAN JOAQUIN COUNTY <br /> We have reviewed the 6Yorkplan and Time Schec file for Additional Soil and Groundwater Investigation <br /> dated 14 July 2004 for the Tracy Byron Road Project located in west Tracy. The workplan is in response <br /> to a Regional Board memorandum dated 19 April 2004 to ChevronTexaco requesting additional <br /> investigative borings. Additional work is needed to delineate the extent of impacts to soil and <br /> groundwater described in the 18 February 2004 soil and groundwater investigation report. The report <br /> was prepared for ChevronTexaco by Science Applications International Corporation (SAIC). <br /> Initially, areas needing more work were identified during construction of dewatering wells associated <br /> with the 2003 storm drain project in Byron Road. The new storm drain generally was adjacent to the <br /> South side of the former location of the Old Valley Pipeline (OVP) alignment. <br /> Following the storm drain project, Regional Board staff requested that borings be advanced upgradient of <br /> impacted areas to delineate affected soil and groundwater on the south side of Byron Road. The 18 <br /> February 2004 report indicated that petroleum hydrocarbon-impacted soil occurs to approximately 30 <br /> feet, with the majority occurring between 4 and 20 feet. Groundwater is affected at several areas along <br /> the south side of Byron Road. The depth to groundwater is approximately 12 to 13 feet. <br /> As described in the February 2004 report, final delineation of the soil and groundwater impacts was not <br /> accomplished and additional site characterization is needed. <br /> The purpose of the proposed investigation is to advance up to ten additional borings and collect and <br /> analyze samples to delineate the extent of impacted soil and groundwater. <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />