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Groundwater Alonitoring Work Plan <br /> 1950 West Fremont Street,Stockton, California <br /> 2.0 WELL INSTALLATION AND GROUNDWATER MONITORING <br /> In order to further evaluate the quality- of groundwater at the site, three groundwater monitoring wells will <br /> be installed and quarterly groundwater monitoring will be conducted. Locations where concentrations of <br /> nickel. NDMA and MTBE were previously found to exceed regulatory criteria are shown on Figure 3. <br /> The sampling locations where concentrations exceeding regulatory criteria were found are within the <br /> footprint of the building, which is currently occupied. For the proposed groundwater monitoring <br /> program, one monitoring well (MW-1) will be installed outside of the building, upgradient of the former <br /> chemical storage and wastewater treatment area. Two monitoring wells (MW-2 and MW-3) will be <br /> installed directly outside the building footprint in the down-gradient direction (towards the north),just <br /> outside of the former plating shop area. The proposed locations of the three monitoring wells are shown <br /> on Figure 3. <br /> 2.1 PRE-FIELD ACTIVITIES <br /> 2.1.1 Permitting <br /> Prior to installation of the monitoring wells, Earth Tech will obtain all necessary permits for installation <br /> of the wells, including a well construction permit from the San Joaquin County Environmental Health <br /> Division and encroaclunent permit from City of Stockton, if needed. <br /> 2.1.2 Utility Clearance <br /> Earth Tech will retain a geophysical consultant to perform a subsurface utility survey at each proposed <br /> monitoring well locations. Underground Service Alert(USA)will also be contacted to locate and mark <br /> utilities at least 48 hours prior to conducting field work. <br /> 2.2 FIELD ACTIVITIES <br /> The field activities to be performed at the site include the following primary, tasks: <br /> • Drilling three 8-inch diameter boreholes to approximately 20 feet below surface ground(bgs). <br /> • Converting each of the three boreholes into 2-inch diameter groundwater monitoring wells: <br /> • Development and groundwater sampling of the newly-installed wells; <br /> • Laboratory analysis of groundwater samples. <br /> Project 102790 4 December 2007 <br />