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I ISite History HERMAN & HELEN'S MARINA I15135 Eight Mile Road, Stockton, California ' 1.0. INTRODUCTION Currently, two 12,000-gallon above ground storage tanks are in use at the site One tank contains gasoline, the second is compartmentalized Into one 5,000-gallon gasoline tank, one 3,000-gallon gasoline tank, one 3,000-gallon diesel tank and one 1,000-gallon oil tank The tanks are connected ' to dispensers by piping contained in a concretc-lined trench The site and the surrounding area are Illustrated in Figure 1 Structures and monitoring well and sampling locations are illustrated on Figure 2 I 20. BACKGROUND ' On 30 October 1991,three underground storage tanks(USTs)were removed from the site by Warren E Gomes Excavating,Inc Although no groundwater was encountered,the bottom of the tanks were rusted Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) and benzene, toluene, ethylbenzene and total xylenes (BTEX) were detected in soil samples collected from the UST excavation at depths between 9 feet and 12 feet below surface grade (bsg), at maximum concentrations of 4,800 milligrams/kilogram (mg/kg) TPH-g, 37 mg/kg benzene, 93 mg/kg ethylbenzene and 500 mg/kg xylenes in sample TK2-N and 350 mg/kg toluene in TNI-N Lead was detected in samples TNI-S and TN2-N and the soil pile at 7 mg/kg, 10 mg/kg and 11 rng/kg, respectively Additional Information can be found in the Condor Earth Technologies, Inc (Condor)-prepared Tank Pull Testing Results, dated 18 November 1991 Based on the contamination detected in the soil samples collected during the UST removals the San Joaquin County Environmental Health Department (EHD) directed the investigation of the TPH-g and TPH-d contaminated soil A brief description ofprevious investigations at the site areas follows On 22 August 1995 three h dro unch soil �bona s -1 HP-2 and HP-3 ' 1� Y p g ) were advanced at the site TPH-g and BTEX were detected in soil and ground water samples collected from each boring,at maximum concentrations of 300 mg/kg TPH-g, 190 mg/kg TPH-d, 12 kg/mg benzene, 3 1 mg/kg toluene,5 5 mg/kg ethylbenzene and 22 mg/kg in soil sample HP-1-11', and 10 micrograms/liter (µg/1) TPH-g, 0 24 µg/1 TPH-d, 260 µg/1 benzene, 8 4 µg/1 ethylbenzene and 36 µg/1 xylenes in water sample HP-1) • On 29 August 1996, five probe borings were advanced at the site TPH-g, BTEX and methyl-tertiary butyl ether (MTBE) were detected in the soil and ground water samples collected from the borings advanced in the northern portion of the site • On 10 September 1997, four ground water monitoring wells (MW-1, MW-2, MW-3 and MW-4) were installed at the site to investigate and monitor the lateral extent of impacted Advanced GeoEnv,ronmental,Inc