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� Blow" ' <br /> � <br /> Working To Restore Nature <br /> 5.1 Workscope and Objectives <br /> RESNA supervised the installation of six soil bonngs Three bonngs were completed as <br /> groundwater monitoring wells and three were completed as vapor extraction test wells Two <br /> ' monitoring wells were installed downgradient of the former underground gasoline storage tank <br /> area and one was installed in the upgradient direction The upgradient well was placed to <br /> facilitate definition of the lateral extent of impacted soil detected beneath the former dispenser <br /> island The well locations are shown on Plate 3 The groundwater monitoring wells were <br /> ' completed to a total depth of approximately 85 feet below grade The remaining three borings <br /> were converted to vapor extraction test wells in preparation of a vapor extraction test The <br /> ' vapor extraction wells were completed to a depth of 50 feet below grade <br /> ' 5.2 Drilling and Soil Sampling <br /> Drilling was conducted, under the direction of RESNA personnel, by Spectrum Exploration, Inc <br /> (C57 No 512268) utilizing a hollow stem auger drill ng To prevent cross-contamination, <br /> ' drilling augers were steam-cleaned before drilling each borehole All rnnseate produced during <br /> decontamination procedures was stored in DOT approved drums and remain on site All drill <br /> ' cuttings produced were stockpiled on site Soil was screened during drilling and segregated into <br /> "clean" and "dirty" soil piles <br /> Soil samples were collected at five-foot intervals with a California modified split-spoon sam ler <br /> PP <br /> and were described and logged continuously according to the Unified Soil Classification System <br /> During drilling, soil samples were screened for volatile hydrocarbon concentrations with a <br /> ' photoionizatlon detector (PID) The soil lithology, sample collection depths and petroleum <br /> hydrocarbon concentrations detected by the PID were recorded by the field geologist on the well <br /> logs which are included in Appendix C <br /> Selected soil samples were analyzed by Sequoia Analytical, ELAP 1210, for BTEX, and TPHg <br /> by EPA methods 8020 and 8015, respectively Samples were collected, transported and <br /> ' 15004718-031594 FNL 5 <br />