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1 2.3 Golden West Environmental Investigation <br /> In April 1992, Golden West Environmental supervised the drilling and sampling of three <br /> soil borings (P1, P2, and P3) at the Site Borings PI and P3 were drilled to depths of 25 and 40 <br /> feet bgs, respectively Boring P2, an angled boring, was drilled to a calculated depth of 40 feet <br /> A total of 21 soil samples were collected and analyzed from the three borings Analytical results <br /> identified trace concentrations of total petroleum hydrocarbons as gasoline (TPH-G), TPH-D, <br /> TPH as het fuel (<0 I mg/kg), and BTEX (<0 I mg/kg) in soil samples from borings P I and P3 <br /> Elevated concentrations of TPH-D (up to 3,100 mg/kg), TPH-G (up to 5,800 mg/kg), TPH as het <br /> fuel (up to 3,500 mg/kg), and BTEX (up to 280 mg/kg) were detected in the soil samples from <br /> boring P2 The highest concentrations of contaminants in boring P2 were identified in the soil <br /> samples collected between 20 feet bgs and 40 feet bgs The vertical extent of contamination <br /> Idetected in soil samples from boring P2 was not fully defined Groundwater was not <br /> encountered during this phase of the investigation <br /> 2.4 Wallace-Kuhl & Associates,Inc. Investigation <br /> In February 1993, Wallace-Kuhl & Associates, Inc drilled eight soil borings (MWI <br /> through MW3, and BI through B5) Borings B1 through B5 were drilled around the perimeter of <br /> the former UST excavation to depths between 45 and 50 feet bgs, and borings MW1 through <br /> MW3 were drilled to depths of 60 feet bgs and were constructed as four-inch diameter <br /> groundwater monitoring wells In addition to these borings, three hand augered samples (DI-1, <br /> DI-2, and DI-3) were collected at a depth of five feet bgs beneath the former fuel dispensers <br /> A total of 60 soil boring samples and three groundwater samples were collected from the <br /> borings and wells The samples were analyzed for TPH as JP4 het fuel (TPH-JP4), <br /> TPH-G, TPH-D, and TPH-motor ail using modified EPA Method 8015, and BTEX using EPA <br /> Method 8020 <br /> Analytical results identified no detectable concentrations of TPH-G, TPH-D, TPH-motor <br /> oil or benzene above laboratory detection limits in the soil samples TPH as het fuel was <br /> identified in the 15, 20, 25, and 30 foot bgs samples from boring B3 Concentrations of aromatic <br /> hydrocarbons to these samples ranged from 3 mg/kg of ethylbenzene in the five-foot sample <br /> collected from boring DI-1, to 1,580 mg/kg of total xylenes in the 20-foot sample from <br /> boring B I <br /> Groundwater samples were collected from wells MWI, MW2, and MW3 on February 10, <br /> 1993 The samples were analyzed for TPH-G, TPH-D, TPH as JP4 het fuel, TPH as motor oil, <br /> and BTEX Analytical results for the groundwater samples identified no concentrations of these <br /> constituents above laboratory detection limits <br /> H IPROJECTSIDSAISTOCKTON\3RDIREPORT FL 4 <br />