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Working To Restore Nature <br /> Since April 18, 1991, wells MW1, MW2, and MW3 have been sampled on three occasions <br /> The levels of petroleum hydrocarbon impact to the groundwater generally increased from May <br /> 1992 until January 1993 The most recent sampling, April 27, 1994, indicated an order of <br /> magnitude decrease in petroleum hydrocarbon concentrations since January 1993 <br /> OBJECTIVESIWORKSCOPE AND METHODOLOGY <br /> Workscope <br /> The objective of this field investigation was to <br /> rO Further define the magnitude and lateral extent of petroleum hydrocarbon impact of the <br /> first groundwater beneath the site <br /> 1 <br /> To achieve the above objective the following activities and workscope were performed <br /> o Two soil bonngs, completed as monitoring wells, were drilled in the historical <br /> downgradient directions from the former tank locations Selected soil samples collected <br /> from the borings were analyzed for BTEX and TPHg by EPA methods 8020 and modified <br /> 8015, respectively <br /> o Subsequent to installation, the wells were surveyed and monitored for depth to water and <br /> the evidence of free product The wells were developed by purging a minimum of three <br /> casing and sand pack volumes, and until verification of the stabilization of pH, electrical <br /> ' conductivity, and temperature to ensure collection of a representative formation sample <br /> The wells were monitored and developed in accordance with RESNA's Quality <br /> ' Assurance/Quality Control Plan (Appendix I, RESNA's Workplan for Additional <br /> Groundwater Investigation, May 23, 1994) <br /> ' O After development groundwater samples weic colimted fro,n each monitoring well and <br /> analyzed for BTEX and TPHg analysis by EPA methods 8020 and modified 8015, <br /> respectively <br /> 150041UZEPORTSISR-0694 WL 6 <br />