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1 <br /> D <br /> 1 C\ Lug S S O C I A T E S I N C <br /> groundwater samples collected from the vicinity of the former 10,000-gallon UST contained <br /> elevated concentrations of petroleum hydrocarbons <br /> ' In August 1998, ATC personnel supervised the advancement of three soil borings at the site <br /> Drilling was performed using hollow stem auger In accordance with the approved workplan,the <br /> soil borings were completed as groundwater monitoring wells MW1, MW2, and MW3 Soil <br /> samples contained detectable concentrations of petroleum hydrocarbons The groundwater <br /> monitoring wells were subsequently developed and the groundwater samples contained <br /> 1 detectable concentrations of total petroleum hydrocarbons as diesel (TPHd) Field activities <br /> were summarized in ATC's Summary Report of Additional Subsurface Investigation, dated <br /> ' October 19, 1998 <br /> In April 2000, ATC personnel supervised the advancement of three soil borings at the site, S138 <br /> ' through SB 10 Soil borings were advanced using a truck mounted Geoprobe® narrow diameter <br /> rig employing direct push technology Soil and groundwater samples were collected and <br /> analyzed from each boring and were found to contain no detectable concentrations of total <br /> ' petroleum hydrocarbons as gasoline (TPHg), TPHd, benzene, toluene, ethylbenzene, xylenes <br /> (BTEX), or methyl tertiary butyl ether (MTBE) Field activities and analytical results were <br /> detailed in ATC's Summary Report of Additional Subsurface Investigation, dated September 7, <br /> 2000 <br /> In June 2000, ATC personnel supervised the advancement of three additional soil borings, MW4 <br /> ' through MW6 The borings were advanced using hollow stem augers Approximately ten inches <br /> of free product was discovered in boring MW4 at a depth of 20 feet bgs In accordance with the <br /> approved work plan, the borings were completed as groundwater monitoring wells MW4, MW5 <br /> ' and MW6 Soil and groundwater samples taken from MW4 contained detectable concentrations <br /> of TPHg and TPHd, but did not contain detectable concentrations of BTEX or MTBE Soil and <br /> ' groundwater samples from MWS and MW6 did not contain detectable concentrations of TPHg, <br /> TPHd, BTEX, or MTBE Field activities and analytical results were detailed in ATC's Summary <br /> Report ofAdditional Subsurface Investigation, dated September 7, 2000 <br /> ' 2 0 QUARTERLY MONITORING ACTIVITIES <br /> ' 221 Groundwater Sampling and Analysis <br /> Fluid levels were taken on September 24, 2001, utilizing an electronic water probe capable of <br /> ' measuring with an accuracy of 11100 of a foot On September 24, 2001, groundwater samples <br /> were collected from wells MW1 through MW6 The samples were collected after purging a <br /> minimum of three well volumes and stabilization of electric conductivity, pH, and temperature <br /> ' Field purge logs are presented in Appendix A Subsequent to purging, groundwater was sampled <br /> and transferred to appropriate sample containers, using clean, disposable bailers with bottom <br /> emptying devices to reduce volatilization <br /> w 1625001reports\CAP doe 2 <br /> 1 <br />