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CaliforniWegional Water Quality Cool Board <br /> Central Valley Region <br /> Linda S.Adams Arnold <br /> Secretaryjor Sacramento Main Officenn[[ �u06 Schwarzenegger <br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California Tag,A Governor <br /> Protection Phone(916)464-3291 •FAX(916)464-464wiRONMENT HEALTH <br /> hup://www.waterbouds.ca.gov/centralvalle PEF,ONM NI"EES <br /> 19 December 2006 <br /> Mr. Andrew Smith <br /> Herman and Helen's Marina <br /> 15135 Eight Mile Road <br /> Stockton, CA 95219 <br /> REVIEW OF THIRD QUARTER 2006 GROUNDWATER MONITORING REPORT, HERMAN <br /> AND HELEN'S MARINA, 15135 EIGHT MILE ROAD, STOCKTON, SAN JOAQUIN COUNTY <br /> Staff of the Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) has reviewed the 31 October 2006 Quarterly Report— Third Quarter 2006 (Third QMR) <br /> submitted by Advanced GeoEnvironmental, Inc. (Advanced) for Herman and Helen's Marina <br /> located at 15135 Eight Mile Road in Stockton (site). The Third QMR describes groundwater <br /> monitoring and remediation activities performed during the third quarter 2006. <br /> Shallow groundwater flow was reportedly to the southeast at a gradient of 0.21 foot per foot <br /> (ft/ft) under the levee system flattening to 0.061 ft/ft in the downgradient lowland area. Deep <br /> groundwater flow was to the south at a gradient of 0.035 ft/ft. Wells MW-4 and MW-6 were <br /> the only two locations showing groundwater petroleum hydrocarbon impact. Maximum <br /> groundwater chemical concentrations were 18,000 micrograms per liter (ug/L) Total Petroleum <br /> Hydrocarbons as diesel (TPHd); 3,200 ug/L TPH gasoline; and 6.3 ug/L methyl tertiary butyl <br /> ether (MTBE). Benzene was not detected in any of the groundwater samples. Target <br /> analytes were not detected in the surface water samples collected from the island drainage <br /> channel or the receiving water samples from the agricultural drainage ditch. <br /> During the past four quarters, TPHd and TPHg concentrations have steadily increased in well <br /> MW-4 reaching 18,000 ug/L and 3,200 ug/L, respectively, in the third quarter 2006. The <br /> concentration of MTBE at well MW-4 increased slightly from non-detect (less than 0.5 ug/L) in <br /> the second quarter 2006 to 6.3 ug/L in the third quarter 2006. Well MW-4 is completed in <br /> shallow groundwater and located upgradient of extraction well EW-1 and the aboveground <br /> storage tanks (ASTs) and downgradient of the underground storage tanks (USTs). <br /> The groundwater pump-and-treat system was operated during the reporting period with some <br /> downtime in September 2006 due to equipment malfunctions. Groundwater was extracted <br /> from well EW-1 at an average flow of approximately 0.4 gallon per minute (gpm) in July and <br /> August 2006 and at 0.04 gpm in September 2006. Approximately 38,120 gallons of <br /> groundwater was extracted and treated during the reporting period. TPHg was reported at a <br /> concentration of 240 ug/L in the July 2006 influent sample and was not detected in the August <br /> and September 2006 samples. Influent MTBE concentrations decreased from 240 ug/L in <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />