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Addendum to the Well Installation and <br /> Hydraulic Testing Report and Additional <br /> P- ARCADIS Well Installation Work Plan <br /> Former Occidental Chemical Corporation <br /> Lathrop, California <br /> design flow rate on an seasonal basis. Treated groundwater that meets discharge limits for Site COCs <br /> would be supplied to Simplot.A portion of the treated BSW water, currently anticipated to be up to 100 <br /> gpm, could be used as the source of water injected into]NJ-12. <br /> Potential Water Quality Effects of INJ-12 Operation <br /> The location of INJ-12 was moved approximately 500 ft west to a location approximately halfway <br /> between the Simplot BSW and proposed extraction wells EW-12 and EW-14. Based on the <br /> groundwater model, injection into INJ-12 will increase the hydraulic gradient towards the extraction <br /> wells, thereby enhancing plume flushing. Oxidation of treated groundwater prior to reinjection will also <br /> enhance in-situ biodegradation of sulfolane. Up to 100 gpm of treated groundwater will be injected into <br /> INJ-12. This is a fraction of the combined groundwater flow rate extracted from wells in the vicinity of <br /> INJ-12. <br /> 6. Summary of Proposed Extraction and Injection Well Modifications <br /> Based on recent Site information, several adjustments were made to the construction details and flow <br /> rates of the proposed additional extraction and injection wells. A summary of the proposed extraction <br /> and injection well design is provided in Table 3 below. Following installation, the proposed wells will be <br /> connected to the current groundwater treatment plant or the proposed Simplot BSW treatment system. <br /> Proposed well locations are shown on Figures 7 through 10. <br /> Table 3.Summary of Proposed Well Construction Details <br /> Well Name Well Type Aquifer Zone Well Depth Screen <br /> (ft bgs) Interval` <br /> (ft b s <br /> EW-10 Extraction Water Table Zone 40 10-40 <br /> EW-11 Extraction Water Table Zone 40 10-40 <br /> EW-12A Extraction Shallow 100 70-100 <br /> Intermediate 150 120-150 <br /> EW-12B Extraction Deep 200 170-200 <br /> EW-13 Extraction Intermediate 150 120-150 <br /> EW-14A Extraction Shallow 100 70-100 <br /> Intermediate 150 120-150 <br /> EW-14B Extraction Deep 200 170-200 <br /> EW-15A Extraction Shallow 100 70-100 <br /> Intermediate 150 120-150 <br /> EW-15B Extraction Deep 200 170-200 <br /> EW-16 Extraction Shallow 100 70-100 <br /> EW-17 Extraction Water Table Zone 40 10-40 <br /> INJ-1 12 Injection Shallow 100 70-100 <br /> Intermediate 150 120-150 <br /> Deep 200 170-200 <br /> 2012-09-13 addendum well install work plan—hy lest rpt docx 10 <br />