Laserfiche WebLink
8 August 2000 <br /> AGE-NC Project No 95-0143 <br /> Page 3 of 8 <br /> 214 Logging <br /> During drilling activities, soil sample duplicates were monitored for the presence of organic vapor <br /> using an organic vapor meter equipped with a photo-ionization detector (PID Thermo <br /> Environmental 580A, 10 0 eV, calibrated to isobutylene) and were visually described on boring logs <br /> in accordance with the Unified Soil Classification System (USCS) Boring logs are included as <br /> Appendix A <br /> 2 2 MONITORING WELL PURGE PROCEDURES <br /> On 10 to 12 May 2000, a Sohnst water level meter was used to measure the depth to ground water <br /> in eight monitoring wells and five vapor extraction wells at the site and in fifteen monitoring wells <br /> at the Madison site relative to the tops of the well casings The groundwater elevations and hydraulic <br /> gradient were determined from these data(Table 3) <br /> After measurement of depths to water, each monitoring well at the site was purged using a two-stage <br /> submersible purge punnp The pump was decontaminated prior to purging each well using an <br /> • Alconox solution and clean tap water Temperature, pH and conductivity of the purged water were <br /> measured at regular intervals during purging using a Hydac water analyzer Approximately twelve <br /> to eighteen gallons of water were removed from each well except for MW-9, from which sixty <br /> gallons of water were purged (approximately three well volumes) All purged water was stored in <br /> 55-gallon DOT-approved drums on-site Field data and field logs are included in Appendix C <br /> 23 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new, disposable bailers and, upon <br /> retrieval,were transferred into 40-nil EPA-approved VOA vials containing 0 5 ml 18%hydrochloric <br /> acid as a sample preservative The samples were labeled and transported under chain-of-custody, in <br /> a chilled container, to McCampbell Analytical, Inc (MAI), a DHS-certified laboratory, and were <br /> analyzed for <br /> • TPH-g in accordance with EPA Methods 5030/8015m, <br /> • BTEX in accordance with EPA Method 8020/602, and <br /> • Fuel oxygenates di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether (TAME) and tertiary butanol (TBA) m accordance with EPA <br /> Method 8260M <br /> • <br /> Advanced GeoEnvironmentai,Inc <br />