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1 1 <br /> M a ! <br /> r � j <br /> 15 May 2001 <br /> AGE-NC project No 98-0534 , <br /> Page 3 of 4 T <br /> as n grade The <br /> The average depth to ground water on 18 Decthe screened intervals of he wells nber 20M was 10 5 feet below1Groundwater was <br /> top of the ground water table occurred w east to southwest {Figure 3} with a low hydraulic gradient <br /> inferred to be flowing to the south southeas <br /> of 0 003 feet/feet <br /> 32 ANALYTICAL RESULTS OF,GROLND WATER SAMPLES <br /> TPH-g was only detected in the ground water sample collected from well MW-6, at a concentration <br /> 2 micro rams per liter {µg11) TPH-d was detected in the ground water samples <br /> p plvelyom wells <br /> of 5 g 1 110 µfill, 95 µg/1 and µg1 <br /> MW-2,MW-4, MW-6 and MW-7 at 74 µg1 = <br /> Benzene was the only BTEX compound detected in the ground water samples{MW-6 at 0 62 µg/1) <br /> TBE was detected in the ground water samples from wells 1WiW-4, MW-5,MW-7 and MW <br /> at - <br /> M12 2 µg11 and 13 µg11=respectively ETBE was detected at 11 <br /> concentrations of 3 0 µg/1, 250 µg1 ' <br /> µg11 in sample MW-6 No other fuel oxygenates were detected in any of the samples <br /> in T <br /> Laboratory orato results of water samples analyzed for petroleum hydrocarbons re summarized 563 a le <br /> to <br /> 2 The laboratory reports for the quarterly monitoring event (MAT <br /> 56313) quality assurance and quality control (QA/QC) reports and chain-of-custody form are <br /> endix B Figure 4 depicts the dissolved hydrocarbon benzene and MTBE <br /> included in App _ <br /> 4,0, SUMMARY AND CONCLUSIONS <br /> Based on the findings from this investigation, AGE concludes.? <br /> site was flowing toward the south-southwest from the former UST with <br /> Ground water on the y <br /> 17 degrees <br /> a very low hydraulic gradient of 0 003 feet/feet or 0 <br /> �} ll network <br /> Dissolved benzene and TPH_g in shallow"ground water are delineated by the we <br /> MTBE was detected in four ground water samples collected, with the highest dissolved <br /> concentration occurring within the former UST area at 250,4g/1 The CV-RWQC13 document <br /> August 2Q00, fists the State of California <br /> titled A Compilrxtaon=af Water Quality MTBE in drinking water at 13 ,ugll <br /> Maximum Contaminant Level (MCL) for <br /> Advanced GeoEnvironmenta4,Inc <br /> s <br />