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EPA Comments on the <br /> Well Monitoring Program, Draft 2000 Annual Monitoring Report"dated December 2000 <br /> for Tracy Defense Depot <br /> GENERAL COMMENTS <br /> 1. The Draft Well Monitoring Program 2000 Annual Monitoring Report for the Defense <br /> Distribution Depot San Joaquin California, Tracy Site, California(Report) acknowledges <br /> that contaminant capture by the groundwater extraction system is incomplete due to <br /> reduced or lack of pumping in some wells. For example, Table 4.1-1 lists numerous <br /> cases when the work plan could not be followed due to pump failure or similar <br /> difficulties. Furthermore, the Report acknowledges that regardless of the condition of the <br /> well pumps, limitations in Treatment Plant#2 would prevent the plant from accepting the <br /> full discharge from extraction wells operating at design pumping rates. The Report states <br /> that total capture is expected to increase after all OU 1 remedial action extraction wells <br /> are operating at design rates consistently for several months, and the Report states <br /> (Section 6.2.1) that it is uncertain when all extraction wells can be operated at design <br /> rates. <br /> Although contaminant plume capture is a critical objective of the system, the Report does <br /> not provide an anticipated schedule for bringing the extraction and treatment system to <br /> full design operation. Please revise the Report to include a proposed schedule for <br /> bringing the extraction and treatment system to full design operation. The format of this <br /> schedule could include a table or text listing: 1) every known problem or obstacle that <br /> presents a limitation to the operation of the extraction and treatment system; 2) the <br /> sequence of activities which must be performed to correct these problems; and 3) a <br /> proposed time frame for performing these activities. If appropriate, this summary can <br /> identify the party responsible for each activity. <br /> 2. According to agreements reached during an August 15, 2000 meeting, DLA was going to: <br /> a) respond to the EPA request that, as part of the review of the 1999 Annual <br /> Monitoring Report (June 19, 2000), a determination be made of an acceptable <br /> radius of influence of the capture zone around each extraction well so that the data <br /> quality objectives for each well can be determined and the required radius of <br /> influence compared to actual capture zone dimensions. The Report (Section 6.2.4) <br /> 1 <br />