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0 <br /> OUR <br /> With regard to the length of the well screens and the vertical gap of 5 feet between the bottom of <br /> the shallow A-zone and the top of the deeper A-zone injection-well screens, it is LFR's experience <br /> in non source-area locations such as the Bank of Stockton, that contaminants follow the most <br /> permeable pathways. Accordingly, we have observed that the injected substrate also follows these <br /> permeable pathways. The highest concentrations of VOCs within the preferred migration pathways <br /> will initially be treated. With time, the lower concentration areas within adjoining sediments will <br /> also be treated as the entire aquifer becomes anaerobic. As such, the fine-grained sediments along <br /> with the more permeable sediments during the implementation of the Phase V IRA will be treated. <br /> An LFR geologist will record a description of the lithology as drilling progresses. The actual <br /> screen depths and dimensions of the gaps between the well screens may vary depending on the <br /> actual lithology. <br /> Comment 4: <br /> Proposed Monitoring Program <br /> As agreed to in the multi-party conference call on June 13, 2007, the proposed monitoring <br /> program will be modified as indicated on the table below. This table is to replace the draft table <br /> on page 25, Section 4.3 of the Detailed Plan. Also, it appears that ferrous iron monitoring should <br /> be added to Table 1, just beneath the total iron entry. <br /> SUMMARY OF MONITORING PROGRAM <br /> Data ERD Upgradient ERD Area Monitoring Downgradient Monitoring <br /> Collection Injection Monitoring Wells Wells <br /> Wells Wells <br /> 22 proposed MW-004A Existing wells MW-108A, Existing Wells MW-113A, <br /> injection wells MW-020B MW-205B, and MW0301C MW-114A, MW-207B, and <br /> New wells MW-121A, MW-208B <br /> MW-122A, and MW-214B New wells MW-124A, <br /> MW-123A, and MW-215B <br /> Injection Volumes hourly Semiannually <br /> and Rates <br /> Contaminants and after semiannually baseline, during injection, baseline, quarterly <br /> Daughter Products development month 1 and 2, quarterly <br /> Field after semiannually baseline, during injection, baseline, quarterly <br /> Biogeochemical development, month 1 and 2, quarterly <br /> Parameters quarterly <br /> Laboratory semiannually baseline, during injection, baseline, quarterly <br /> Biogeochemical month 1 and 2, quarterly <br /> Parameters <br /> Organic Substrate baseline, semiannually baseline, during injection, baseline, quarterly <br /> Indicators quarterly months 1 and 2, quarterly <br /> [ft-Fam-RTC-14]m_LPL-PhV-06750(final).do :d 4 <br />