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I <br />' 07 May 2003 <br /> • AGE-NC Project No 95-0143 <br />' Page 2 of 5 <br /> a two-stage submersible purge pump Temperature, pH and conductivity of the purged water were <br /> measured at regular intervals during purging using an Oakton water analyzer All purged water was <br /> stored on-site in 55-gallon DOT-approved drums Field data and field logs are included in <br /> Appendix A <br /> 2 1 2 Collection of Ground Water Samples <br /> After allowing the wells to achieve 80% recovery of the pre-purge volume, water samples were <br /> collected from each purged well using a new, disposable bailer and, upon retrieval, were transferred <br /> into 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample <br /> preservative The samples were labeled and transported in a chilled container,under cham-of-custody <br /> protocol, to McCampbell Analytical, Inc (MAI), a DHS-certified laboratory The samples were <br /> analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 modified, and <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 8021B <br /> 22 OZONE SPARGE WELL INSTALLATION <br /> IBetween 02 and 05 December 2002, 17 pilot borings were advanced at the site for installation of <br /> ozone sparge wells OSW-1 through OSW-17 <br />' 2 2 1 Pilot Boring BAdvancementg <br /> IBorings OS W-1 through OS W-17 were advanced to approximately 25 feet below surface grade(bsg) <br /> utilizing a truck-mounted hollow stem drill rig equipped with 8-inch diameter hollow-stem augers <br />' The drill rig and three-man crew was supplied by Mitchell Drilling Environmental Corp of Rancho <br /> Cordova, California Auger returns generated during boring advancement were stored on-site in <br /> properly labeled DOT-approved model 17H 55-gallon drums, pending laboratory analysis Boring <br /> locations are shown on Figure 2 <br /> Advanced GeoEnvironmental,Inc <br />