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. Site Background Information PLAZA LIQUORS 11 2420 West Turner Road, Lodi, California toluene, ethyl benzene, and total xylenes BTEX), fuel oxygenating compounds Including methyl- tert-butyl ether(MTBE)and total lead in accordance with the appropriate EPA Methods On 16 May 1999 the excavation was re-sampled due to inconsistencies between the field observations noted during the tank removal and the analysis results TPH-g, and the fuel oxygenate MTBE were detected in soil samples collected beneath the former USTs at concentrations as high as 260 mg/kg, and 46 mg/kg, respectively Low levels of BTEX compounds were also detected in the samples collected beneath the former USTs In addition,TPH-d was present at 48 mg/kg in the sample collected from beneath the former dispenser area and TPH-g, TPH-d, and, MTBE were detected in samples collected from the excavated (stockpiled) soil The stockpiled soil was transported off-site with approval from the EHD, and accepted by Mr Dennis Alexander, a local farmer who intended to use the soil to shore up levees around his farm SITE ASSESSMENT ACTIVITIES On 04 June 1997, RAH Environmental, Inc overexcavated the original tank excavation to a depth of 22 feet below surface grade(bsg), in the area of the previous soil sample locations Subsequently, three soil samples were collected at 22 feet bsg or 6 feet below the original samples and analyzed for TPH-g and BTEX with MTBE in accordance with EPA Methods 8015m and 8020,respectively TPH-g and BTEX were not detected in any of the analyzed samples MTBE was detected at 22 feet bsg in all three of the soil samples analyzed, at a maximum concentration of 4 0 mg/kg In March 2000, four ground water monitoring wells (MW-1 through MW-4) were installed at the site by Advanced GeoEnviromnental,Inc (AGE) A total of 13 soil samples were analyzed for TPH- g, TPH-d, BTEX and the suite of five fuel additives by EPA Method 8260 Modified TPH-g was detected in soil samples analyzed from borings MW1 and MW2 at concentrations as high as 2,300 milligrams per kilogram (mg/kg) and TPH-d was detected at concentrations as high as 590 mg/kg BTEX compounds were detected, with the exception of benzene, at concentrations as high as 11 mg/kg, 8 3 mg/kg and 50 mg/kg, respectively Petroleum hydrocarbons were not detected in soil samples collected from MW3 and MW4 MTBE was detected in a sample collected from monitoring well MW2 at a concentration of 0 87 mg/kg(MW2-25)by EPA Method 8260 No other oxygenates were detected in the soil sample analysis On 27 and 28 February and 01 March 2002, three soil boring (CPT-1, CPT-2 and CPT-3) were advanced on-and off-site to total depths of 128 feet bsg utilizing CPT technology Seven hydrologic units (HU)were identified Significant concentrations of petroleum hydrocarbons were detected in the water samples collected from boring CPT-2 from units HU3, HU5 and HU6 Lesser concentrations of hydrocarbons were detected in the water samples collected from CPT-3 from the same hydrologic units Very low concentrations of toluene, xylenes and MTBE were detected in CPT1 The vertical extent of petroleum hydrocarbon-impacted ground water is defined off-site In Advanced GeoEnvironmental,Inc