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Geosyntec <br /> consultants <br /> months,then quarterly thereafter for at least one additional quarter. Quarterly monitoring will <br /> continue until implementation of Phase 2 or recommendations for a reduced frequency are <br /> proposed to,and approved by,the RWQCB. <br /> Results of the Phase 1 implementation and first two quarters of performance groundwater <br /> monitoring will be submitted to the RWQCB as the Phase 1 EISB Implementation Report. <br /> Recommendations for Phase 2 implementation will be made in this report. Recommendations <br /> could include refinement to the Phase 2 implementation plan,or in the event that Phase 1 does <br /> not show successful degradation of COCs,additional measures could be recommended before <br /> Phase 2 implementation.The additional measures could include activities such as sampling <br /> injection well IW-A to evaluate geochemical conditions at the injection site or the injection of <br /> additional electron donor and/or bioaugmentation culture into IW-A. <br /> Subsequent monitoring, if conducted prior to Phase 2 implementation,will be reported on a <br /> semi-annual basis,concurrent with the semi-annual groundwater monitoring reports submitted <br /> as part of the Site MRP. <br /> 9.4 Phase 2 EISB Implementation <br /> Phase 2 implementation will be refined by the results of Phase 1.The purpose of Phase 2 is to <br /> fully implement EISB in the Shallow and Deeper Target Areas. Phase 2 groundwater <br /> amendment activities are anticipated to begin approximately eight months following the <br /> completion of the Phase 1 injections. <br /> 9.4.1 Well Installation and Development <br /> The proposed Phase 2 well locations are shown in Figure 10. Proposed wells will be installed by <br /> licensed C-57 contractors.The following 13 wells are proposed to be installed: <br /> • One horizontal injection well(HIW-A)is proposed in shallow groundwater and will be <br /> installed using horizontal drilling technology. <br /> • 12 vertical wells are proposed to be installed via sonic drilling technology,as follows: <br /> o Two shallow monitoring wells(MW-E and MW-F), located approximately 10 <br /> feet downgradient of the horizontal injection well; <br /> o Two deeper extraction wells(EW-A and EW-B); <br /> o Five deeper injection wells(IW-B, IW-C, IW-D, IW-E,and IW-F);and <br /> o Three deeper monitoring wells(MW-B,MW-C,and MW-D), located <br /> downgradient of nearby deeper injection wells. <br /> RAW 50 02.06.2015 <br />