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r' <br /> Mr.Nuel Henderson, SJCEHD November 4,2005 <br /> Well Installation Work Plan <br /> ARCO Station 5469, Stockton,California <br /> Page 5 <br /> Task 2D: Monitoring Well Development and Sampling <br /> Wells MW-11 through MW 13 will be allowed to stand a minimum of 72 hours before <br /> being developed. Monitoring well development will consist of surging with a bailer <br /> followed by groundwater pumping. Development will continue, to the extent practical, <br /> until the discharged water runs clean and pH and conductivity measurements stabilize. <br /> Water levels, water-quality parameters (pH, temperature, conductivity), and discharged <br /> quantities will be recorded for each well. <br /> A minimum of 24 hours after the groundwater monitoring wells are developed, the wells <br /> will be purged and groundwater samples will be collected. The samples will be collected <br /> using a disposable bailer, transferred to laboratory-supplied glass vials, and placed in an <br /> ice-chilled cooler. The groundwater samples will be transported under strict chain-of- <br /> custody protocol to a California-certified analytical laboratory for analysis. Wells MW 1 I <br /> through MW-13 will be incorporated into the existing quarterly monitoring program. <br /> Task 2E: Site Survey <br /> A California licensed land surveyor will be retained to survey the horizontal coordinates <br /> and elevations of each newly installed well. Elevations of the top-of-casing of the wells <br /> will be surveyed to a 0.01-foot vertical accuracy and tied to the previous survey at the <br /> site. The elevations will be established relative to a known benchmark in feet mean sea <br /> level (MSL). These data will be submitted to the California Regional Water Quality <br /> Control Board as required by AB 2886 (GeoTracker). <br /> Task 3: Laboratory Analysis <br /> Soil and groundwater samples will be analyzed for gasoline range organics (GRO) using <br /> U.S. Environmental Protection Agency (USEPA) Method 8015, and for benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX), MTBE, TBA, Ethyl Tertiary Butyl Ether <br /> (ETBE), Tertiary Amyl Methyl Ether (TAME), Di-isopropyl Ether (DIPS), <br /> 1,2-dichloroethane (1,2-DCA), and ethanol using USEPA Method 8260. <br /> Task 4: Report Preparation <br /> A report will be submitted following completion of work activities. Results of the <br /> investigation will be presented in the context of an SCM, as requested in the August 31, <br /> 2005 SJCEHD letter. The report will include a scaled site plan, soil boring logs, well <br /> details, tabulated soil and groundwater analytical data tables, and certified analytical <br /> results relating to this phase of subsurface investigation. Data collected during previous <br /> subsurface investigation and monitoring activities at the ARCO site, and the former Top <br /> Filling Station and Knowles-Roek property sites, will also be incorporated into the SCM. <br /> K:1Bp-Arco for URS154691Work P1anslAreo5469-well install workplan-2005.doc STRATU5 <br />