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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Fresno Branch Office Governor <br /> Environmental Internet Address: http://www,swrcb.ca.gov/—mgcb5 <br /> Protection 1685 E Street,Fresno,California 93706-2020 <br /> Phone(559)445-5116•FAX(559)445-5910 D C l� <br /> 17 April 2003 APR 18 2003 <br /> LN ,!ENT HEALTH <br /> F'_;, ..I/SERVICES <br /> Mr. M. Scott Mansholt <br /> ChevronTexaco <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road, Room K2050 <br /> San Ramon, CA 94583-2324 <br /> SITE INVESTIGATION,BYRON ROAD, CITY OF TRACY,SAN JOAQUIN COUNTY <br /> Construction of the stormwater project along Byron Road requires a dewatering system to lower the <br /> shallow groundwater table in order to excavate and install two 60-inch diameter stormwater pipelines. <br /> The dewatering wells were completed in March 2003. <br /> The well installation revealed that soil and groundwater along much of Byron Road has been impacted <br /> (including free product) by historical leaks from the two former crude oil pipelines that previously <br /> extended through the area. Since discovery and confirmation that total petroleum hydrocarbon impacts <br /> are associated with the Old Valley Pipeline (OVP), an investigation(s) needs to be conducted to <br /> determine the lateral and vertical extent of affected soil and assess impacts to groundwater. <br /> In accordance with the Revised Consistent Technical Approach (CTA) to Site Evaluation and Decision- <br /> Making document, ChevronTexaco needs to prepare and submit a Workplan for characterizing the <br /> extent of soil and groundwater impacts that have been identified. The Workplan needs to describe the <br /> methods used to define the lateral and vertical extent of affected soil and groundwater and include <br /> sufficient data to assess potential health risks associated with petroleum hydrocarbons present at the site. <br /> Additionally, a well survey needs to be conducted to obtain information for any groundwater production <br /> wells that are being used for municipal, domestic, agriculture, industrial, and/or other uses within 2,000 <br /> feet along the site. <br /> California Environmental Protection Agency <br /> CO Recycled Paper ' <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways <br /> you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.govlmgcb5 <br />