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03 July 2003 <br /> AGE-NC Project No 95-0130 <br /> Page 2 of 6 <br /> After water levels were measured, approximately 14 to 18%2 gallons of ground water (a minimum <br /> of three casing-water volumes per well)were evacuated(purged)from wells MW-1 through MW-5 <br /> utilizing a submersible Grundfos pump,approximately%2 to 10 gallons of ground water were purged <br /> from wells VW-1B, VW-1C, VW-2A and VW-3A utilizing disposable polyethylene bailers <br />' Temperature,pH and conductivity were measured for stabilization at regular purge-volume intervals <br /> from each well using an Oakton water analyzer Field data and logs are provided in Appendix A <br /> Purged ground water was containerized In 55-gallon drums and stored on-site in an area lacking <br /> general public access <br /> Multi-level monitoring wells MW-6 (A- E)and MW-7(A-E)were purged by lowering and raising <br /> a 3/8-inch outer diameter, length-discrete polyethylene hose equipped with a ball-valve water tip <br /> through the top chambers Into the specific water-charged screened section A Watera-Hydra-Lift H <br /> pump equipped with a mechanical arm was utilized to surge the polyethylene hose Approximately <br /> 0 25 to 3 25 gallons of ground water (a minimum of three casing-water volumes per well) were <br /> purged from each well Temperature,pH and conductivity were measured for stabilization at regular <br /> purge-volume Intervals from each well using the Oakton water analyzer Field data and logs are in <br /> Appendix A Multi-level well purged ground water was transferred to 55-gallon drums and stored <br /> on-site In an area lacking general public access <br /> 2 2 GROUND WATER SAMPLING <br /> Ground water samples were collected from purged wells MW-6 A-E) and MW-7 (A-E)utilizing <br /> p p g ( <br /> 318-inch diameter polyethylene tubing, ground water samples were collected from all other purged <br />' wells utilizing new, 2-inch diameter disposable polyethylene bailers Ground water samples were <br /> transferred Into 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% <br />' hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles were <br /> not present in the vials after filling and capping Ground water sample containers were labeled with <br /> the well designation, date, time, and sampler's Initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> 1 Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br />' for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g)by EPA Methods 5030/8015 <br />' . Modified,• Benzene,toluene, ethylbenzene and xylene(BTEX)and methyl-tertiary butyl ether(MTBE) <br /> by EPA Method 8020, and <br />' Advanced GeoEnvironmental,Inc <br />