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' APPENDIX A <br /> GROUND WATER SAMPLE COLLECTION PROCEDURES <br /> Van Buskirk Golf Course Facility <br /> 1740 Houston Avenue, Stockton, California <br /> A.I. GROUNDWATER SAMPLING PROCEDURES <br /> ' Prior to purging and sampling the ground water monitoring wells, static water level was measured <br /> using an electric water level indicator. Water level data was recorded to the nearest 0.01 foot from <br /> a reference point marked on the top of the PVC well casing. Before and after each use, the <br /> measurement device was rinsed with water. <br /> ' A.I.I. Well Evacuation <br /> L ' Subsequent to measurement of depth to water and prior to sampling, the well was purged to ensure <br /> that the sample is representative of ground water in the formation, rather than of water standing in <br /> the well casing. The monitoring well was purged using a two-stage submersible pump. The wells <br /> were purged until: 1) a minimum of three casing volumes was removed from each well; and 2)field- <br /> measured ground water parameters including temperature, electrical conductivity, and pH had <br /> lei stabilized. A ground water sample was collected following 80 percent recovery of ground water <br /> within the well. <br /> ' Purge water generated during development activities was contained on-site in an appropriately <br /> labeled 55-gallon drum. <br /> ' A.1.2. Sample Withdrawal <br /> Ground water samples were collected from the monitoring wells using disposable polyethylene <br /> bailers. These bailers are disposed of after one use and required no decontaminating, minimizing <br /> cross contamination due to sampling devices. The samples were drawn and collected in such a <br /> manner that agitation and exposure of the groundwater to the atmosphere was minimal. Sample <br /> containers were filled using the appropriate disposable sampling attachment which allows controlled <br /> flow out of the bottom of the bailer. <br /> ' A.1.3. Sample Handling <br /> The ground water samples were collected into laboratory-supplied containers. The ground water <br /> ' samples for TPH-g, BTEX, and fuel oxygenate analyses were collected into 40-m1 VOA vials <br /> containing 0.5 ml of hydrochloric acid as preservative. Samples for TPH-d analysis were collected <br /> *, into unpreserved 1-liter amber glass containers. Following collection the samples were appropriately <br /> Advanced GcoEnvironmenut,Inc. <br /> I <br />