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t <br /> APPENDIX A <br /> GROUND WATER SAMPLE COLLECTION PROCEDURES <br /> •' Van Buskirk Golf Course Facility <br /> 1740 Houston Avenue, Stockton, California <br /> A.1. GROUND WATER SAMPLING PROCEDURES <br /> ' Prior tolin in ur and sampling round water monitoring wells, static water level was.measured <br /> p g g p g the g <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.1.1. Well Evacuation <br /> ' 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 /> 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 /> ' <br /> A.1.2. Sample 1 Withdrawal <br /> •, <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 GeoEnvironmekal,Inc. <br />