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Work Plan for 1Zefrned Plume Definition and Management ofFloating Product-7500 W 111h St., Tracy, C.1. Page 2 <br /> g 3 <br /> �- Proposed Casing Total <br /> �.s Well No Diameter Depth Purpose <br /> MW-15 continued contain no detectable concentrations of chemicals of <br /> concern. <br /> .. MW-16 2 in. 25 ft. To check for the presence of floating product and <br /> investigate groundwater-quality along the plume axis <br /> further down-gradient from Monitoring Well MW-7. <br /> Groundwater-quality data from this location will also <br /> be useful at later stages of site characterization to <br /> evaluate intrinsic bioremediation and natural <br /> attenuation chemicals of concern in groundwater. <br /> MW-17 2 in. 25 ft. To investigate groundwater quality along the western <br /> fringe of the plume of affected groundwater. It is <br /> "IV., ; currently assumed that groundwater at that Iocation will <br /> contain no detectable concentrations of chemicals of <br /> concern. <br /> MW-18 2 in 25 ft. To check for the presence of floating product and <br /> investigate groundwater-quality along the plume axis at <br /> long distance down-gradient from Monitoring Well <br /> MW-7. Groundwater-quality data from this location <br /> —VOW MW-7. <br /> also be useful at later stages of site characterization <br /> to evaluate intrinsic bioremediation and natural <br /> attenuation chemicals of concern in groundwater. <br /> MW-19 2 in 25 ft. To provide a monitoring location down-gradient from <br /> the currently assumed northern limit of the plume of <br /> -- affected groundwater to provide future warning if the <br /> U northerly migration of the plume extends to that <br /> distance from the source on the 7500 West Eleventh <br /> .� Street property. <br /> 7.2 Well Drilling and Soil Sampling <br /> Permits for construction of the proposed wells will be obtained from the SJCEHD. Where <br /> `r necessary, application will be made to the San Joaquin County Department of Public Works <br /> (SJCDPW) for encroachment permits to install wells in the public highways. Bonds to <br /> ensure proper maintenance of such wells will also be secured. <br /> The monitoring well borings for the wells having a 2 in. diameter will be advanced using an <br /> 8-in., open-stem auger mounted on a drilling rig operated by a drilling contractor holding a <br /> C57 license issued by the California Contractors State License Board. In the case of the 6 in. <br /> diameter wells the boring will be 12 in. in diameter. A California-licensed geotechnical <br /> SJC <br />