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' California Regional Water Quality Control Board - . <br /> Central Valley Region <br /> Katherine Hart, ChairF <br /> ' Linda S.Adams 1685 E Street, Fresno,California 93746 Arnold <br /> secretary for Schwarzenegger <br /> Environmental (559)445-5116•Fax(559)445-5516 Govamor <br /> Protection http://www,waterboards.ca.goy/centralvalley <br /> ' 6 August 2010 <br /> Lee Higgins <br /> Chevron Environmental Management Company <br /> 6111 Bollinger Canyon Road <br /> B R 1 Y13484 <br /> ' San Ramon, CA 94583 <br /> REVIEW - SOIL AND GROUNDWATER INVESTIGATION REPORT, MOUNTAIN HOUSE <br /> ' DEVELOPMENT SITE #6, MOUNTAIN HOUSE, SAN JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted the 25 February 2010 <br /> report entitled Soil and Groundwater Investigation Report (Report), Mountain House <br /> Development Site #6 (Site), Mountain House, San Joaquin County. The Report was prepared <br /> on behalf of Chevron by Science Applications International Corporation -- Benham Companies, <br /> ' LLC (SAIL). Detailed comments provided in the enclosed memorandum are summarized <br /> below. <br /> ' Based on our review, Central Valley Regional Water Quality Control Board staff finds that the <br /> lateral extent of crude oil affected soil and groundwater has been defined by analytical results <br /> for crude oil/petroleum hydrocarbons that are-ND or which did not exceed applicable <br /> ' environmental screening levels. Affected soil and groundwater has been adequately defined <br /> and additional characterization is not needed. <br /> ' According to the analysis for water quality parameters for samples from borings and a nearby <br /> private well, the analytical results exceed several components listed by California Department <br /> of Health Services Recommended Maximum Contaminant Level for drinking water. In <br /> ' addition, crude oil affected soil and groundwater resides primarily within and beneath the <br /> utility/highway corridor easements and beneath a portion of an adjacent agricultural field. It is <br /> unlikely that new groundwater wells would be installed within the project area due to limited <br /> access to the utility corridor and considering the available water supply provided by the nearby <br /> Mountain House Community Services District. <br /> A human health risk screening assessment and an ecological receptor survey evaluation may <br /> be prepared and should be based on the current and anticipated future use(s) of the Site. <br /> California Environmental Protection Agency <br /> ' (Recycled Paper <br />