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4.0 Data Evaluation <br /> 4.1 Underground Utility Survey <br /> Due to anomalies in the GPR data proximal to the original CPT boring location, the CPT boring <br /> location was moved 0 6 meters (2 feet) to the northwest <br /> 4.2 Groundwater Conditions <br /> TPHg, toluene, ethylbenzene, and total xylenes were detected in groundwater samples collected <br /> from boring SC-1 None of these contaminants were detected at concentrations exceeding their <br /> respective State of California Primary Maximum Contaminant Levels (MCLS) <br /> The constituents n-Propylbenzene, tert-Butylbenzene, and 1,2,4-Trimethylbenzene were detected <br /> in groundwater samples collected from boring SC-1 <br /> Benzene was detected in groundwater samples SC-1-90' and SC-1-100' at concentrations at <br /> concentrations of 6 1 and 7 7 µg/1, respectively These concentrations exceed the State of <br /> California Primary MCL of 1 pgfl <br /> The estimated contaminant mass for the three potential water-bearing zones is presented in <br /> Table 2 <br /> a"nra� °ozwrsrne� 4-1 <br />