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California Regional Water Quality Control Board <br /> i- <br /> Central Valley Regions a <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretary for Fresno Branch Office Governor <br /> Environmental Internet Address: http://www,swreb.ca.govlrwgcb5 <br /> Protection 1685 E street,Fresno,California 95706-2020 <br /> Phone(5 59)445-5116•FAX(5 59)445-5910 <br /> 31 July 2003 <br /> Mr. M. Scott Mansholt <br /> ChevronTexaco C (OPY <br /> Chevron Environmental Management Company <br /> P.O. Box 6012 <br /> San Ramon, California 94583-2324 <br /> WORKPLAN REVIEW—MOUNTAIN HOUSE SITE #2, MOUNTAIN HOUSE, SAN JOAQUIN <br /> COUNTY <br /> We have reviewed the Workplan for Soil and Groundwater Investigation, Mountain House Site#2, <br /> submitted by Geomatrix Consultants, Inc. on behalf of ChevronTexaco. The workplan proposes <br /> collecting additional soil and groundwater samples in the vicinity of crude oil pollution previously <br /> identified in three of eight borings completed at the site. Depth to groundwater was between 7 and 17 <br /> feet below ground surface, however, no grab groundwater samples were collected from the site. Site#2 <br /> is located at the northwest intersection of Byron Road and Mountain House Creek, northwest of the City <br /> 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 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 understands that portions of Site#2, 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 potential impacts on the proposed development, <br /> ChevronTexaco should proceed to implement and complete soil and groundwater characterization <br /> activities as well as any remediation prior to site improvements. <br /> California Environmental Protection Agency <br /> Ca Recryxled 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 />