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Geosyntec <br /> consultants <br /> 4. MONITORING WELL INSTALLATIONS <br /> This section describes new monitoring wells proposed to be installed at RRI in 2022. <br /> As discussed above in Section 3, the following data gaps in the groundwater monitoring well <br /> network in the Site 3, Site 4, and Central Areas were identified based on the existing data: <br /> • Monitoring the cross-gradient extent of VOCs in groundwater at Site 4 west of the <br /> former source area and monitoring well W-333 <br /> • Monitoring the cross-gradient extent of VOCs in groundwater at Site 3 west of the <br /> former source areas and monitoring well W-075 <br /> • Monitoring the downgradient extent of VOCs and TPH in groundwater from the <br /> Central Area west of monitoring well W-341 <br /> Monitoring wells are proposed to be installed in these areas to monitor the lateral vertical extent <br /> of COCs in groundwater(Figures 24 to 28). The locations and screen intervals for the proposed <br /> monitoring wells are shown in Figures 4 to 8 and described in Table 4. <br /> 4.1 New Monitoring Well Installations <br /> Monitoring well installation activities will be conducted in accordance with the Standard <br /> Operating Procedure (SOPs) in Appendix E. The SOP was previously included in the DTSC- and <br /> CVRWQCB-approved 2018 GMWP (Geosyntec, 2018a). All new monitoring wells installed at <br /> RRI since 2018 have been installed in accordance with the SOP. The well construction design <br /> details included in the SOP are based on the hydrogeologic CSM and lithology encountered at <br /> RRI. <br /> RRI Groundwater Monitoring Work Plan 17 June 2022 <br />