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CaliforniaWgional Water Quality Cor A Board <br /> Central Valley Region = r <br /> Karl E. Longley, ScD P.E. Chair -' <br /> Linda S.Adams 1685 E Street,Fresno,California 93706 Arnold <br /> Secretary for Schwarzenegger <br /> Environmental (559)445-5116•Fax(559)445-5910 <br /> Protection <br /> http://www.waterboards.ca.gov/centralvalley Governor <br /> F� IJUiL <br /> 21 November 2008 <br /> NOV 2 5 2008 <br /> ENViRONl`,AEN i HEALTH <br /> PERNIM'OSERVICES <br /> M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> 6111 Bollinger Canyon Road <br /> Rm 3432 <br /> San Ramon, CA 94583 <br /> REVIEW -WELL ABANDONMENT REPORT AND AMENDED SOIL AND GROUNDWATER <br /> INVESTIGATION WORKPLAN, US CAN - WELTY ROAD PROPERTY, VERNALIS, SAN <br /> JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted a Well Abandonment <br /> Report (Report) and the Amended Soil and Groundwater Investigation Workplan (Workplan), <br /> dated 12 November 2008. The Report and Workplan was prepared by Science Applications <br /> International Corporation (SAIC) on behalf of Chevron. The historical Old Valley Pipeline <br /> (OVP) and Tidewater Associated Oil Company (TAOC) pipelines, formerly owned/operated by <br /> predecessors of Chevron, were along the northeast side of the US Can (Site) property. Crude <br /> oil leaks attributed to the historical OVP and/or TAOC pipelines have been documented at the <br /> Site. <br /> On 11 October 2007, a monitoring well abandonment and a soil and groundwater investigation <br /> workplan was approved by the Central Valley Regional Water Quality Control Board (Central <br /> Valley Water Board) staff. During August 2008, SAIC completed a Site investigation to <br /> evaluate the extent of affected soil and groundwater. In addition, SAIC destroyed groundwater <br /> monitoring wells MW-4 and 5. Based on the investigation results, SAIC determined that <br /> additional borings were needed. <br /> In order to complete the project by the end of the year, SAIC requested verbal approval of the <br /> Workplan. According to the Workplan, SAIC proposed ten soil borings for delineation and if <br /> affected soil is noted, an additional nine contingency borings are proposed. On 13 November <br /> 2008, Central Valley Water Board staff forwarded approval of the Workplan to SAIC via e-mail. <br /> Central Valley Water Board staff concurred with the proposed Workplan and this letter <br /> provides written confirmation. <br /> California Environmental Protection Agency <br /> ca Recycled Paper <br />