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02 February 1996 <br /> AGE-NC Project No 95-0142 <br />' Page 2 of 4 <br /> sle to investigate the lateral and vertical extent of hydrocarbon-impacted soil and ground water Soil <br />' and vapor samples collected during the investigation determined that hydrocarbon-impacted soil in <br /> u the upper vadose zone at the site is limited to the immediate vicinity (30-foot radius) of the former <br />' UST excavation(TK1-90) Hydrocarbon-impacted ground water at the site is limited to wells MW- <br /> 1, MW-2 and MW-3 <br />' In October 1995, a soil vapor extraction(SVE)pilot test was performed by AGE to evaluate remedial <br /> options for the site Based upon results of the pilot test, installation of a soil vapor extraction/in-sau <br /> air sparging (SVE/IAS) system was recommended in a Corrective Action Plan (CAP) prepared by <br />' AGE Details of the site assessment and the proposed SVE/IAS system are included in the CAP, <br /> prepared and submitted by AGE in December 1995 <br /> 1 <br /> 3.0. PROCEDURES <br /> 3 I MONITORING WELL PURGE PROCEDURES <br /> The scope of work included the monitoring and sampling of three ground water monitoring wells and <br /> one SVE well Well VE-1 contained sufficient water to be purged and sampled Tri lieu of MtiV-2, <br /> at the request of Mr Harlin Knoll of the PHS-EHD <br />' On 21 December 1995, a Solinst water level meter was used to measure the depth to ground water <br /> in wells MW-I through MW-4 and VE-1 The relative ground water elevation in each well and <br /> hydraulic gradient were determine from these data points (Table-1) <br /> After depth measurements, approximately 2 to 40 gallons of water(a minimum of 3 well volumes) <br />' from MW-1, MW-3, MW-4 and VE-1 were purged using a two-stage submersible pump <br /> Temperature, pH, and conductivity were measured at ten-gallon intervals (one-half gallon intervals <br /> for VE-1 and two-gallon intervals for MW-4) using an-ICM water analyzer Monitoring well <br />' stabilization data and field data sheets are included in Appendix A Purged water was stored on-site <br /> in 55-gallon drums <br /> 1 , <br /> 32 COLLECTION OF GROUND WATER SAMPLES <br />' y Water samples were collected from each purged well using a new, clean disposable plastic bailers <br /> Immediately upon retrieval, the samples were transferred into 40-m1 VOA vials preserved with <br /> hydrochloric acid and transported to McCampbell Analytical, Inc (MAI) in Pacheco, California All <br /> samples were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g) and volatile <br /> aromatics (benzene, toluene, ethyl benzene and xylene BTE&X) in accordance with EPA methods <br />' 8015/5030 and 8020/602, respectively <br /> 1 <br />