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California Regional Water Quality Control Board <br /> Central Valley Region . <br /> Robert Schneider,Chair Gray Davis <br /> Winston H.Hickox Governor <br /> Secrerary fnr Fresno Branch Office <br /> Environmental Internet Address: httpWwww.swrcb.ca.gov1rwgcb5 <br /> Protection 1685 E Street,Fresno,California 95706-2020 <br /> Phone{559}445-5116•FAX(559)445-5910 <br /> 31 July 2003 <br /> Mr. M. Scott Mansholt <br /> ChevronTexaco <br /> Chevron Environmental Management Company <br /> P.O. Box 6012 <br /> San Raman, California 94583-2324 <br /> WORKPLAN REVIEW—MOUNTAIN HOUSE SITE#1, MOUNTAIN HOUSE, SAN JOAQUIN <br /> COUNTY <br /> use Site <br /> We have reviewed the Workplan for Soil and Groundwater <br /> of ChevranTe�aco.nTheountain wo workplan proposes 1 <br /> submitted by Geomatrix Consultants, Inc. on <br /> collecting additional sail and groundwater samples in the vicinity of crude oil pollution previously <br /> identified in two of nine borings completed atthe site. nt inof Byron Rothto groundwater wasad and Moundinb feet <br /> below ground surface. Site#1 is located at the southeast <br /> House Creek, northwest of the City of Tracy, in western San Joaquin County. <br /> According to our files, the initial discovery of petroleum hydrocarbons in soil and groundwater was <br /> confirmed attributable to leaks from the Old Valley Pipeline (OVP) that had existed on the Mountain <br /> House site. According to the Consistent Technical Approach (CTA) to Site Evaluation and Decision- <br /> Making document for Old Valley Pipeline Sites-Central Valley Region, once a leak associated with the <br /> OVP is confirmed, the lateral and vertical extent of soil and groundwater impacts will be systematically <br /> characterized in a timely manner in order to be protective of water quality. <br /> ChevronTexaco needs to complete characterization of the lateral and vertical extent of pollution in soil <br /> and groundwater in order to reduce/eliminate and/or identify potential risks to human health and the <br /> environment. After the characterization is complete, if it is determined that remediation is necessary, a <br /> plan and time schedule should be included with the report. <br /> Regional Board staff understand that portions of Site#1, in close proximity to the former OVP, are <br /> currently being developed with private residences, schools, underground utilities, and retail stores. <br /> Consequently, in order to reduce or eliminate t and coial mplete etpacts on the proposed e soil and groundwater characterization <br /> ChevronTexaco should proceed to 1np <br /> activities as well as any remediation prior to site improvements. <br /> California Environmental Protection Agency <br /> coy Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 <br />