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O1 November 2004 <br /> AGE-NC Project No. 95-0137 <br /> Page 6 of 7 <br /> the electric oil/water level indicator will be washed in an Alconox solution and rinsed with water. <br /> 3.4.2. Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling, the well will be purged using <br /> a submersible pump to ensure that the groundwater sample is representative of the formation,rather <br /> than water standing in the well casing. The well will be purged until: 1) a minimum of three casing <br /> volumes is removed from the well; and/or 2) the field-measured ground water parameters (pH, <br /> temperature and electrical conductivity) have stabilized. However, if a well is purged dry prior to <br /> evacuating three casing volumes, a ground water sample will be collected following SO percent <br /> recovery of ground water level within the well or within 8-hours of well evacuation. <br /> Purge water, free-product, and decontamination water generated during the ground water sampling <br /> activities will be contained in DOT-approved drums which will be appropriately labeled for storage. <br /> Drums containing purge water will be stored on-site pending appropriate removal and disposal. <br /> 3.4.3. Sample Withdrawal <br /> Water samples will be collected from the monitoring well using a disposable polyethylene bailer or <br /> dedicated teflon tubing used in conjunction with the inertia pump. The bailers are disposed of after <br /> one use and require no decontaminating and the teflon tubing used with the inertia pump is either <br /> dedicated to each well or changed at each sampling event,thereby minimizing cross contamination <br /> due to sampling devices. Samples will be drawn and collected in such a manner that agitation and <br /> exposure of the groundwater to the atmosphere are minimal. <br /> 3.4.4. Sample Handling �Jos <br /> Ground water samples will be collected into laboratory suppli containers. Ground water samples <br /> to be analyzed for TPH-g, TPH-d, BTEX and fuel additives will be collected into 40-m1 volatile <br /> organic analysis (VOA) vials containing 0.5-m1 of hydrochloric acid as preservative. Following <br /> collection,the samples will be placed on ice and kept in a cooler until delivered to the laboratory for <br /> analysis. Chain of custody protocols will be used to document sample custody transfer from the field <br /> to the analytical laboratory. A chain-of-custody form will accompany the samples. <br /> Advanced GeoEnvironmental,Inc. <br />