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(:VYJ%TC A S S O C I A T E S I N C petroleum hydrocarbons One groundwater sample was collected from each boring at the depth groundwater was first encountered Groundwater samples indicated the presence of petroleum hydrocarbons Results are summarized in ATC's Summary Report of Additional Subsurface Investigation, dated September 9, 1998 On February 18, 1999, a geologist from ATC Associates supervised the installation of three groundwater monitoring wells from 39 to 41 feet bgs Soil borings MW1, MW2, and MW3 were completed as two-inch monitoring wells One soil sample from each boring was collected and after the groundwater monitoring wells were developed on groundwater sample was collected from each well Soil and groundwater samples contained detectable concentrations of petroleum hydrocarbons Results are summarized in ATC's Summary Report of Additional Subsurface Investigation, dated June 1, 1999 SAMPLING ACTIVITIES On December 13, 2000, ATC Associates personnel collected groundwater samples from monitoring wells MW1 through MW3 The locations of the monitoring wells are shown on Figure 2 Prior to collection of groundwater samples, the depth to water, pH, electrical conductivity, and temperature were measured in the monitoring wells and recorded A minimum of three well casing volumes was purged from each well prior to sampling The wells were allowed to recover and samples were collected from each well using dedicated disposable bailers The groundwater samples collected from each well were submitted to State-certified Argon Laboratories (ELAP Cert No 2359) for chemical analysis of total petroleum hydrocarbons as gasoline (TPHg) utilizing EPA method 8015 modified, and benzene, toluene, ethylbenzene, and xylenes (BTEX) and methyl tertiary butyl ether (MTBE) utilizing EPA method 8020 Groundwater well purge and sample logs are contained in Attachment 1 ANALYTICAL RESULTS The groundwater sample collected from well MW 1 contained detectable concentrations of TPHg and BTEX The TPHg concentration was 6,600 parts per billion (ppb) and BTEX concentrations ranged from 5 4 ppb to 120 ppb The groundwater sample collected from well MW2 contained detectable concentrations of TPHg and benzene of 180 and 2 3 ppb, respectively No other petroleum hydrocarbon constituents _ were detected in well MW2 The groundwater collected from well MW3 contained TPHg at a concentration of 1,000 ppb Toluene, ethyl benzene, and xylenes were detected at concentrations of 0 5, 8 7, and 2 6 ppb, respectively • w 1149811quan1yl4gr-2000 doc 2