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California egional Water Quality Control Board <br /> Central Valley Region ' <br /> Karl E. Longley,ScD, P.E.,Chair <br /> Linda S.Adams Arnold <br /> Secretary for <br /> 1685 E Street,Fresno,California 93706 Schwarzenegger <br /> Environmental (559)445-5115•Fax(559)445-5910 Governor <br /> Protection fittp://www.waterboards.ca.govlcentralvalley <br /> 13 May 2009 <br /> M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> 6111 Bollinger Canyon Road <br /> Room 3432 <br /> San Ramon, CA 94583 <br /> REVIEW — ADDITIONAL SOIL AND GROUNDWATER INVESTIGATION WORKPLAN, <br /> MOUNTAIN HOUSE DEVELOPMENT SITE #6, MOUNTAIN HOUSE, SAN JOAQUIN <br /> COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted the Additional Soil and <br /> Groundwater Investigation Workplan Addendum (Addendum) dated 23 April 2009, for <br /> Mountain House Development Site #6 (Site). The Addendum was prepared for Chevron by <br /> Science Applications International Corporation (SAIC). Following completion of a March 2008 <br /> investigation, SAIC proposed in the July 2008 report of findings, that additional soil and <br /> groundwater investigation was needed. <br /> The California Regional Water Quality Control Board, Central Valley Region, (Regional Water <br /> Board) staff approved the July 2008 workplan provided certain proposed boring locations are <br /> repositioned to evaluate groundwater downgradient. Consequently, before the workplan could <br /> be implemented, property access conflicts arose and SAIC submitted the April 2009 <br /> Addendum. <br /> SAIC proposed the following: <br /> • Reposition seven borings approximately 15 feet to the east-northeast to adjacent <br /> properties where access may be more easily attained. <br /> • The two alternate boring locations suggested by Regional Water Board staff will be <br /> completed. <br /> • Contingency borings may be completed if affected soil/groundwater is encountered and <br /> access is allowed by the current agreement(s). <br /> Subsequent to receiving the 23 April 2009 Addendum, SAIC notified Regional Water Board <br /> staff that one property owner requested that the field work be delayed until after the current <br /> growing season ends and the crops are harvested in October 2009. <br /> California Environmental Protection Agency <br /> ct}Recycled Paper <br />