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Evaluation of Hydrocarbons May 17, 1990 <br /> Waterfront Redevelopment, Stockton, California AGS 39048-2W <br /> After an initial water-level measurement, the wells will be developed by manually raising <br /> and lowering a PVC surge-block assembly cleaned with Alconox, followed by pumping to <br /> remove the silty water and sediment entering the well. After development, the wells will <br /> be allowed to stabilize for 48 hours as required by the San Joaquin County Public Health <br /> Services Department. Following that time, the wells will be purged of 3 to 4 well volumes <br /> L <br /> of water using a submersible pump. During purging, the ground water will be monitored <br /> for pH, temperature, and conductivity and purging will continue until these parameters <br />_ have stabilized. Water purged from the wells will be stored in appropriately labeled, 55- <br /> gallon, steel 17E drums approved for this use by the Department of Transportation, until <br /> suitable disposal options are selected based on laboratory analysis. Following ground-water <br /> purging, the wells will be allowed to recovery to static conditions, a sample representative <br /> of the formation water will be collected from each monitoring well using a Teflon bailer <br /> cleaned with Alconox and deionized water. <br /> The water sample will be transferred slowly and sealed in appropriate laboratory-cleaned <br /> glassware with Teflon-lined lids. Glassware will be selected according to laboratory <br /> guidelines for sample containers compatible with each analysis requested. The samples will <br /> be labeled and placed promptly in iced storage. Chain of Custody Records will be initiated <br /> in the field by the geologist and will accompany the samples to the analytical laboratory. <br /> Copies of the Chain of Custody Records will be included in our report. <br /> 13 <br /> APIOA490' GeoSYSAMS <br />