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(:Y/AT4L <br /> A S S O C I A T E S I N C . <br /> wells to assess groundwater gradient and flow direction. 'Groundwater monitoring well <br /> construction details are shown on Figure 3. <br /> Groundwater Monitoring Well Development <br /> Measurement of depth to water in the new well and the existing wells will be completed to <br />} evaluate the direction and magnitude of the groundwater gradient beneath the site. The new well <br /> I{ will be developed using surge and bail techniques until the produced water is relatively sediment <br /> free. Prior to the collection of a groundwater sample, a minimum of three well volumes (casing <br /> and sand pack) will be purged. Temperature, pH, water elevation, and electric conductivity will <br /> 1 be measured and allowed to stabilize. The water sample will be collected using a disposable <br /> bailer. <br /> k <br /> Groundwater Sample Anal <br /> A groundwater sample will be submitted using chain-of-custody record to a State-certified <br /> laboratory. The groundwater sample will be analyzed for TPHg, TPHd, TPHss, and BTEX. <br /> Purge water will be stored on site in 55-gallon drums approved for hazardous liquid storage <br /> ' pending laboratory analysis. <br /> Report Preparation <br /> Upon completion of all field activities, a summary report will be prepared for submittal to <br /> PHS/EHD. ATC will prepare a report that will include a description of all field activities, <br /> laboratory analytical results, boring logs, manifests, and recommendations. <br /> All work described in this workplan will be performed under the direction of a California <br /> Registered Professional Engineer. All field work will be completed in accordance with the Site <br /> Safety Plan already on file for this site with PHS/EHD. <br /> Projected Schedule <br /> Once approval of this workplan has been received, State Cleanup Fund preapproval will be <br /> obtained, encroachment permits from the City of Stockton will be obtained, adjacent property <br /> owners will be notified, and ATC will schedule drilling activities. It is anticipated the drilling <br /> activities will be completed in one day. ATC will notify PHS/EHD at least 48 hours prior to <br /> beginning any field activities. The summary report will be submitted to PHS/EHD <br /> i <br /> approximately four to five weeks after the completion of field activities. <br /> F <br /> i <br /> w:1172951reportslwkp 1299.doc 4 <br />