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07 April 1999 <br /> . AGE-NC Project No 98-0540 <br /> Page 5 of 9 <br /> I were purged from each well Purged ground water was containerized in properly labeled DOT - <br /> approved Model 17H 55-gallon drums and was stored on-site in an area lacking public access <br /> 3 4 QUARTERLY MONITORING AND SAMPLING ACTIVITIES <br /> On 11 March 1999, quarterly ground water monitoring and sampling event was performed Ground <br /> water depths and total well depths were measured in wells MW-1, MW-2, and MW-3 to the nearest <br /> 0 01-foot utilizing a Solinst water level meter Ground water elevations were calculated by <br /> subtracting the depth to ground water from the surveyed casing elevations (Table 2) Ground water <br /> elevations were plotted and contoured on a scaled site map <br /> After water levels were measured, a minimum of three well volumes of ground water were purged <br /> from wells MW-1, MW-2, and MW-3 by hand bailing and a Grund Fos submersible pump Ground <br /> I water stabilization parameters,including temperature,pH and conductivity,were measured at regular <br /> purge volume intervals utilizing an ICM model 52200 water analyzer Stabilization data and field <br /> logs are contained in Appendix C Purged ground water was stored in 55-gallon drums on-site in an <br />'• area lacking public access <br /> The ground water levels from monitoring wells MWA, MW-2, and MW-3 achieved a minimum of <br />' 80 percent recharge prior to sample collection Ground water samples were collected utilizing <br /> disposable polyethylene bailers Upon retrieval,each sample was transferred to EPA-approved 40-m1 <br /> VOA vials, containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to <br /> Iensure that visible air bubbles were not present in the VOAs after filling and capping Ground water <br /> sample containers were labeled with the well designation, date, time, and sampler's initials <br />' Following collection, each sample was logged on a chain-of-custody form, placed in a chilled <br /> container and transported to a DHS-certified laboratory for analysis for <br />' S TPH-g in accordance with EPA Method 8015M, <br /> • BTEX and MTBE in accordance with EPA Method 602, and <br /> • Fuel oxygenates in accordance with EPA Method 8260M <br /> I4.0• FINDINGS <br /> Soil descriptions, site stratigraphy, and ground water elevation and gradient were determined from <br /> • field data Hydrocarbon impact on soil and groundwater is characterized from laboratory analytical <br /> data <br /> Advanced GeoEmironmental,Inc <br />