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Work Plan for Environmental Investigation May 18 , 1989 <br /> Proposed ARCO Station Woodbridge, California AGS 39044-1W <br /> After an initial water-level measurement, the wells will be <br /> developed by manually raising and lowering a PVC surge-block <br /> assembly cleaned with Alconox, followed by pumping to remove the <br /> silty water entering the well. After development the wells will <br /> be allowed to stabilize for 48 hours as required by the San <br /> Joaquin Local Health District requirements. Following that time <br /> period the wells will be purged of 3 to 4 well volumes of water <br /> using a submersible pump. During purging the ground water will <br /> be monitored for pH, temperature, and conductivity and purging <br /> will continue until these parameters have stabilized. Water <br /> purged from the wells will be stored in appropriately labeled, <br /> 55-gallon, steel 17E drums approved for this use by the <br /> Department of Transportation, until suitable disposal options are <br /> selected based on laboratory analyses. Following ground-water <br />.» recovery to static conditions, a sample representative of the <br /> formation water will be collected from each monitoring well using <br /> a Teflon bailer cleaned with Alconox and deionized water. <br /> The water sample will be transferred slowly and sealed in <br /> appropriate laboratory-cleaned glassware with Teflon-lined lids. <br /> Glassware will be selected according to laboratory guidelines for <br /> sample containers compatible with each analysis requested. The <br /> samples will be labeled and placed immediately in iced storage. <br /> 15 <br /> A,v A490' GeoSysterns <br />