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11C\1V <br /> 16 0 <br /> A S S O C I A T E S I N C <br /> On April 23, 1998, a geologist from ATC Associates supervised the advancement of six soil <br /> borings, SB1 through SB6, to 21 feet below ground surface (bgs) A site plan showing soil <br /> boring locations is included as Figure 2 Soil samples were collected at five-foot intervals and <br /> grab groundwater samples were collected from each boring Samples were analyzed for <br /> petroleum hydrocarbons and elevated concentrations of petroleum hydrocarbons were detected in <br /> soil and groundwater samples <br /> On September 21, 1998, an ATC geologist supervised the advancement of five soil borings, SB7 <br /> through SB 11, from 5 to 31 feet bgs A site plan showing soil boring locations is included as <br /> Figure 2 Soil samples were collected at five-foot intervals and grab groundwater samples were <br /> collected from each boring Samples were analyzed for petroleum hydrocarbons and elevated <br /> concentrations of petroleum hydrocarbons were detected in soil and groundwater samples <br /> On January 27, 1999, an ATC geologist supervised the advancement of two soil borings, MW 1 <br /> and MW3, to 35 feet bgs and one continuous core soil boring, MW2, to 45 feet bgs Analytical <br /> results for the soil samples indicated the presence of petroleum hydrocarbons in boring MW2 <br /> located in the center of the former UST location The groundwater wells were developed and <br /> sampled and the groundwater samples from wells MW1 and MW2 contained detectable <br /> concentrations of petroleum hydrocarbons Results are summarized in ATC's Summary Report <br /> of Additional Suhvurface Investigation, dated April 7, 1999 <br /> In July 1999, ATC supervised the advancement of two soil borings, MW4 and MW5, south and <br /> southwest of the former excavation area The borings were completed as groundwater monitoring <br /> wells Analytical data indicated the groundwater samples from the new wells were impacted <br /> with TPHd The soil samples contained no detectable concentrations of total petroleum <br /> hydrocarbons as diesel (TPHd) or total petroleum hydrocarbons as gasoline (TPHg) The July <br /> 1999 well installation activities are detailed in ATC's Summary Report of Well Installation <br /> Activities, dated August 26, 1999 <br /> 2.0 FOURTH QUARTER 1999 MONITORING AND SAMPLING <br /> 2.1 Sampling Activities <br /> On December 10, 1999, groundwater samples were collected by ATC Associates personnel from <br /> monitoring wells MW1 through MW5 The locations of the monitoring wells are shown on <br /> Figure 2 Prior to collection of groundwater samples, the depth to water, pH, electrical <br /> conductivity, and temperature were measured in the monitoring wells and recorded A minimum <br /> of three well casing volumes were purged from each well prior to sampling The wells were <br /> allowed to recover and samples were collected from each well using dedicated disposable bailers <br /> The groundwater samples collected from each well were submitted to State-certified Argon <br /> Laboratories Inc (FLAP Cert No 2358) for chemical analysis of TPHg and TPHd utilizing EPA <br /> w 1130991reportslsumwe1i doc 2 <br />