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01 April 2004 <br /> • AGE-NC Project No 97-0301 <br /> Page 2 of 6 <br /> After water levels were measured, approximately 3 to 28 gallons of ground water (a minimum of <br /> three casing-water volumes per well)were purged from single-completed wells MW-1,MW-2 and <br /> MW-5 through MW-7, and approximately 0 75 to 3 gallons were purged from multi-level wells <br /> ' MW-8 through MW-12 Each well was purged by lowering and raising a 3/a-inch outer diameter, <br /> length-discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into <br /> the specific water-charged screened section A Watera-Hydro-Lift II pump equipped with a <br /> ' mechanical arm was utilized to surge each well with a polyethylene hose Temperature, pH and <br /> conductivity were measured for stabilization at regular purge-volume intervals from each well using <br /> an Oakton water analyzer Field data and logs are included with Appendix A Purged ground water <br /> ' was containerized in 55-gallon drums and was stored on-site in an area lacking general public access <br /> 2 2 GROUND WATER SAMPLING <br /> After each well was purged,ground water levels were measured to verify the amount of ground water <br /> ' recharge Upon aclueving at least 80% ground water recharge, samples were collected from wells <br /> MW-1,MW-2 and MW-5 through MW-12 utilizing the techniques described above inpurging each <br /> well Ground water samples were transferred into 40-m1 EPA-approved volatile organic analysis <br /> (VOA) vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and 1-liter amber <br /> bottles without sample preservative Care was taken to ensure that visible air bubbles were not <br /> present in the vials after filling and capping Ground water sample containers were labeled with the <br /> well designation, date, time, and sampler's initials <br /> ' 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> ' Following collection and labeling,each ground water sample was logged on a chain-of-custody form, <br /> placed in a chilled container and transported to a Cal Tech Environmental Laboratories,a California <br /> Department of Health Services (DHS)-certified laboratory, for analysis for <br /> ' - Total petroleum hydrocarbons quantified as gasoline,diesel,kerosene and motor oil(TPH-g, <br /> TPH-d, TPH-k and TPH-mo respectively)by EPA Methods 8015C/5030B/3510C, <br /> - Benzene, toluene, ethyl benzene and xylene (BTEX), methyl tertiary-butyl ether (MTBE) <br /> 1,2-Dichloroethane(I,2-DCA),ethylene dibromide(EBD),di-isopropyl ether(DIPE),ethyl <br /> ' tert butyl ether(ETBE),tert amyl methyl ether(TAME)and tertiary butanol(TBA)by EPA <br /> Method 8260B <br /> r <br /> • <br /> ' Advanced GcoEnviron mental,Inc <br /> 1 � <br />