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22 February 2010 <br /> AGE-NC Project No. 96-0235 <br /> Page 6 of 7 <br /> Ground water sample collection will be performed in accordance with the EHD's Recommended <br /> Groundwater Sampling Guidelines, dated 15 February 1995. <br /> 3.4.1. Static Water Level Measurements <br /> Before purging and sampling during ground water monitoring events, static water level will be <br /> measured using a Solist water level meter.Water level data will be recorded to the nearest 0.01 foot <br /> 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 /> 3.4.2. Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling, the well will be purged using <br /> a u,,i ng a-Waterra inertia pump and dedicated tubing to ensure the ground water sample is <br /> representative of the formation,rather than water standing in the well casing.The well will be purged <br /> until: 1)a minimum of three casing volumes is removed from the well;and/or 2)the field-measured <br /> ground water parameters pH, temperature and electrical conductivity have stabilized. However, if <br /> a well is purged dry prior to evacuating three casing volumes, a ground water sample will be <br /> collected following 80 percent recovery of ground water level within the well or within 8-hours of <br /> well evacuation.Purge water,free-product,and decontamination water generated during the ground <br /> water sampling activities will be contained in DOT-approved drums which will be appropriately <br /> labeled for storage.Drums containing purge water will be stored on-site pending appropriate removal <br /> and disposal. <br /> 3.4.3. Sample Withdrawal <br /> Water samples will be collected from the monitoring well using a dedicated teflon tubing used in <br /> conjunction with the inertia pump. Teflon tubing used with the inertia pump is either dedicated to <br /> each well or changed at each sampling event, thereby minimizing cross contamination due to <br /> sampling devices. Samples will be drawn and collected in such a manner that agitation and exposure <br /> of the ground water to the atmosphere are minimal. <br /> 3.4.4. Sample Handling <br /> Ground water samples will be collected into laboratory supplied containers. Ground water samples <br /> to be analyzed for TPH-g,TPH-d,BTEX and fuel additives(MTBE/1,2-DCA)will be collected into <br /> Advanced GeoEnvironmental,Inc. <br />