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California -agional Water Quality C, trot Board C <br /> Central Valley Region <br /> Katherine Hart, Chair <br /> Linda S.Adams Edmund G.Brown Ji <br /> Acting Secretary forrive#200, Rancho Cordova, California 95670-6114 Governor <br /> t r <br /> Environmental RECE 6)464-3291 • FAX(916)464-4645 <br /> Protection http://www.waterboards.ca.gov/centraIvalley <br /> MAY 0 9 2011 <br /> 29 April 2011 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. Nathan Crum <br /> Valley Pacific Petroleum Services, Inc. <br /> 166 Frank West Circle <br /> Stockton, CA 95206 <br /> CORRECTIVE ACTION PLAN CONCURRENCE, VALLEY PACIFIC PETROLEUM <br /> SERVICES, 930 VICTOR ROAD, LODI, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff reviewed the 21 April 2011 Corrective Action Plan Clarification (CAP <br /> Clarification) submitted by Ground Zero Analysis, Inc. (GZA) on behalf of Valley Pacific <br /> Petroleum Services, Inc. (Valley Pacific) for the site at 930 Victor Road in Lodi (Site). <br /> The 29 December 2010 Corrective Action Plan (CAP) proposed to perform site <br /> remediation using soil vapor extraction (SVE), and then to evaluate supplementing the <br /> system with air sparging (AS) if SVE influent levels become asymptotic. Our 20 January <br /> 2011 letter commented that Valley Pacific's 11 October 2010 Soil Vapor Extraction Pilot <br /> Test Report (Pilot Test Report) selected AS/SVE to remediate the CDCs in the <br /> groundwater and vadose zone based on the rationale that AS/SVE would likely enhance <br /> the biodegradation potential at the Site by increasing the dissolved oxygen levels in <br /> groundwater. Therefore, we required Valley Pacific to adhere to the findings of the Pilot <br /> Test Report that includes incorporation of AS into the SVE system before SVE treatment <br /> is discontinued. <br /> The CAP clarification elucidates that AS will be incorporated into the remedy before SVE <br /> is discontinued. As such, we concur with Valley Pacific's selection of AS/SVE as the site <br /> remedy and the CAP Clarification. <br /> If you have any questions regarding this letter, you may contact me at (916) 464-4811 or <br /> betaylor@waterboards.ca.gov. <br /> =- - � <br /> BRIAN TAYL'O'R, P.G. <br /> Engineering Geologist <br /> cc: Mr. Harlin Knoll, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Gregory Stahl, Ground Zero Analysis, Inc., Escalon <br /> Mr. Patrick Riddle, Law Offices of Patrick D. Riddle, Acampo <br /> California Environmental Protection Agency <br /> �� Recycled Paper <br />