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CaliforniWegional Water Quality Cc "rol Board a Central Valley RegionKatherine Hart,Chair <br /> Linda S.AdamsArnold <br /> Secretaryfor 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Schwarzeneggr <br /> Environmental Phone(916)464-3291 •FAX(916)464-4645 Governor <br /> Protection http://www.waterboards.ca.gov/centralvalley <br /> 5 April 2010 <br /> O 53 <br /> 010 <br /> � L <br /> Mr. Nathan Crum <br /> Valley Pacific Petroleum Services, Inc. E�v�RpN S R���ES <br /> 166 Frank West Circe <br /> Stockton, CA 95206 <br /> ANNUAL GROUNDWATER MONITORING REPORT AND WORK PLAN FOR SOIL <br /> VAPOR EXTRACTION PILOT TEST, VALLEY PACIFIC PETROLEUM SERVICES, <br /> 930 VICTOR ROAD, LODI, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff reviewed the 28 January 2010 Annual Groundwater Monitoring and <br /> Sampling Report (Annual 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 /> During 2009, depth to groundwater ranged from about 55 feet below ground surface <br /> (bgs) to about 61 feet bgs. MW-7 was dry. Groundwater flow ranged from <br /> southwesterly to southeasterly at gradients ranging from about 0.003 feet per foot (ft/ft) <br /> to 0.018 ft/ft. The observations and gradient calculations are consistent with historical <br /> observations. <br /> Separate phase hydrocarbon (SPH) was measured in three wells (MW-6R, MW-8 and <br /> MW-9R). Valley Pacific personnel now periodically remove SPH manually from the wells <br /> when observed. The Annual Report estimates that a grand total of about 1,148 gallons <br /> of SPH/water mixture have been removed from Site wells since April 1994. <br /> Maximum concentrations of constituents of concern (CDCs) during 2009 were observed <br /> in. M1.N-6R, which typically contains SPH but did not during three of the four sampling <br /> events. Maximum CDCs in this well included 47,000 micrograms per liter (lag/L) of total <br /> petroleum hydrocarbons as gasoline (TPHg) and 5,000 lag/L of TPH diesel (TPHd). <br /> Maximum concentrations of benzene, toluene, ethylbenzene, and xylenes (collectively <br /> BTEX) in MW-6R were 4,700 lag/L, 5,800 lag/L, 1,000 lag/L, and 7,800 lag/L, respectively, <br /> and the maximum methyl tertiary butyl ether (MTBE) concentration was 3,800 lag/L. <br /> MW-14 was installed on the property to the east of the Site in December 2009 and <br /> sampled in January 2010. The results show that groundwater samples did not contain <br /> any detectable petroleum hydrocarbons. Based on these data, Valley Pacific concluded <br /> that the lateral and vertical extent of the plume has been defined. <br /> Starting in the fourth quarter of 2008, biodegradation indicator parameter monitoring <br /> was conducted in five wells for a year-long assessment of the baseline bioremediation <br /> California Environmental Protection Agency <br /> 01 Recycled Paper <br />