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15 January 2007 <br /> AGE-NC Project No. 99-0669 <br /> Page 8 of 10 <br /> 3.1.3.1. Static water level measurements <br /> Before purging and sampling during ground water monitoring events, static water level will be <br /> measured using an electric water level indicator.Water level data will be recorded to the nearest 0.01 <br /> foot from a reference point marked of the top of the PVC well casing. Before and after each use,the <br /> electric oil/water level indicator will be washed in an Alconox solution and rinsed with water. <br /> 3.1.3.2. Well evacuation <br /> Subsequent to measurement of depth to water and prior to sampling,the well will be purged utilizing <br /> either a submersible pump,inertia pump or by hand bailing to ensure that the ground water sample <br /> is representative of the formation, rather than water standing in the well casing. The well will be <br /> purged until: 1) a minimum of three casing volumes is removed from the well; and/or 2) the <br /> field-measured ground water parameters pH,temperature and electrical conductivity have stabilized. <br /> However, if a well is purged dry prior to evacuating three casing volumes, a ground water sample <br /> will be collected following 80 percent recovery of ground water level within the well or within <br /> 8-hours of well evacuation. <br /> Purge water and decontamination water generated during the ground water sampling activities will <br /> be contained in DOT-approved drums which will be appropriately labeled for storage. Drums <br /> containing purge water will be stored on-site pending appropriate removal and disposal. <br /> 3.1.3.3. Sample withdrawal <br /> Water samples will be collected from the monitoring well using a disposable polyethylene bailer or <br /> a dedicated teflon tubing used in conjunction with an 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 ground water to the atmosphere are minimal. <br /> 3.1.3.4. Sample handling <br /> Ground water samples will be collected into laboratory supplied containers.Ground water samples <br /> to be analyzed for TPH-g,BTEX,oxygenated compounds(MTBE,TAME,ETBE,DIPE and TBA) <br /> and fuel additives (1,2-DCA and EDB) will be collected into 40-milliliter (ml) volatile organic <br /> analysis (VOA) vials. Following collection, the samples will be placed on ice and kept in a cooler <br /> Advanced GeoEnvironmental,Inc. <br />