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22 December 1998 <br /> AGE-NC Protect No 95-0128 <br /> Page 3 of 8 <br />' 23 LOGGING <br /> During probe boring activities, soil sample duplicates were monitored for the presence of organic <br /> vapor using an organic vapor meter(OVM)equipped with a photo-ionization detector(PID Thermo <br /> Environmental 580A, 10 0 eV, calibrated to 1sobutylene) and were visually inspected and descnbed <br /> on boring logs using the Unified Soil Classification System (USCS) Boring logs are summarized <br /> in Appendix A <br /> 2 4 EQUIPMENT DECONTAMINATION <br /> All sampling tools and brass sleeves used for sample collection were thoroughly rinsed with clean <br /> water after washing with a solution of Alconox All Geoprobe rods were cleaned prior to <br /> advancement of each probe boring <br /> 2 5 MONITORING WELL PURGE PROCEDURES <br /> On 15 June 1998, a Solinst water level meter was used to measure the depth to ground water in <br /> monitoring wells MW-I through MW-7 and vapor well VW-1 <br />' After depth to ground water measurements, a minimum of 3 well volumes of water was purged from <br /> each well to be sampled using a PVC submersible two-stage pump Approximately 14 gallons of <br />' water were removed from vapor well VW-1, 24 gallons of water were removed from well MW-1, <br /> 20 gallons of water were removed from wells MW-2 and MW-3, 12 gallons of water were removed <br />' from well MW-5, and 10 gallons of water were removed from wells MW-4, MW-6 and MW-7 <br /> Temperature, pH and conductivity of purged ground water were measured at 2-gallon intervals and <br /> 4-gallon intervals,as appropriate for each well,using an ICM water analyzer The field data and field <br />' sheets are included in Appendix B Purged water was temporarily stored on-site in 55-gallon DOT <br /> H-17 storage drums Following purging, the depth to ground water was measured to ensure that a <br /> minimum of 80%well-volume recharge had been achieved prior to sampling <br /> 26 GROUND WATER SAMPLE COLLECTION <br />' A water sample was collected from each well using a new, clean, disposable plastic bailer <br /> Immediately upon retrieval, samples were transferred into three 40-mI EPA-approved VOA vials <br /> containing 0 5 ml 18%hydrochloric acid as a sample preservative and into a one-liter amber bottle <br /> Advanced GeoEnr ironmenta!Inc <br /> I <br />