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California Regional Water Quality Cor*rol Board <br /> Central Valley QRegiona; ; <br /> Katherine Hart,Chair "°m�°�'w <br /> Linda S.Adams Arnold <br /> Secretor}fo,� 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Phone(916)464-3291 •FAX(916)464-4645 Schwarzeneeeet <br /> Environments! Governor <br /> Protection http://www.waterboards.ca.gov/centralvalley <br /> 21 October 2010 <br /> UNTEDD <br /> 2 6 tole <br /> Mr. Nathan Crum HEALTH <br /> Valley Pacific Petroleum Services, Inc. pERMITjSERVICES <br /> 166 Frank West Circle <br /> Stockton, CA 95206 <br /> SEMI-ANNUAL GROUNDWATER MONITORING REPORT AND SOIL VAPOR <br /> EXTRACTION PILOT TEST REPORT, VALLEY PACIFIC PETROLEUM SERVICES, <br /> 930 VICTOR ROAD, LODI, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Central Valley `"Dater <br /> Board) staff reviewed the 24 June 2010 Semi-Annual Groundwater Monitoring and <br /> Sampling Report (Semi-Annual Report) and the 11 October 2010 Soil Vapor Extraction <br /> Pilot Test Report (Pilot Test Report) submitted by Ground Zero Analysis, Inc. (GZA) on <br /> behalf of Valley Pacific Petroleum Services, Inc. (Valley Pacific) for the site at <br /> 930 Victor Road in Lodi (Site). Monitoring at the Site is conducted pursuant to <br /> Monitoring and Reporting Program (MRP) No. R5-2002-0827. <br /> Depths to groundwater were measured on 1 March and 8 June 2010 in 14 wells. Depth. <br /> to groundwater ranged from about 56 feet below ground surface (bgs) to about 59 feet <br /> bgs. MW-7 was dry. Groundwater flowed predominantly to the south at gradients <br /> ranging from about 0.004 feet per foot (ft/ft) to 0.01 ft/ft. The observations and gradient <br /> calculations are consistent with historical observations. <br /> During March, MW-6R and MW-9R contained a separate phase hydrocarbon (SPH) <br /> sheen and during June, MW-6R had no SPH, while MW-9R contained 0.005 feet of <br /> SPH. MW-8 contained SPH thicknesses up to 0.27 feet during both months. Valley <br /> Pacific personnel periodically remove SPH manually from the wells when observed. The <br /> Semi-Annual Report estimates that a grand total of about 1,220 gallons of SPH/water <br /> mixture have been removed from Site wells since April 1994. <br /> Valley Pacific proposed in the 9 March 2010 Work Plan For Soil Vapor Extraction Pilot <br /> Test (Pilot Test Work Plan) to conduct a 3-day soil vapor extraction (SVE) pilot test to <br /> evaluate the scope of a full-scale air sparge/soil vapor extraction (AS/SVE) system. <br /> Pursuant to the Pilot Test Work Plan, one triple-nested SVE well (VEW-1) was installed <br /> at the Site on 11 May 2010 in preparation for an SVE pilot test that was scheduled for <br /> 28 July 2010. The three nested wells, VEW1-S, VEW1-I, and VEW1-D, are screened <br /> between 10 to 20 feet bgs, 23 to 43 feet bgs, and 46 to 61 feet bgs, respectively. <br /> Maximum concentrations of dissolved constituents of concern (CDCs) are typically <br /> observed in MW-6R. During the second quarter, however, the highest COC <br /> concentrations were observed in VEW1-D. They included 150,000 micrograms per liter <br /> California Environmental Protection Agency <br /> Za Recycled Paper <br />