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Defense Depot Tracy -2- 27 May 1988 <br /> We understand the following tasks are planned, or recently <br /> completed: <br /> Sampling of the existing 62 monitoring wells at the site, <br /> and chemical analysis by EPA Methods 601 and 602 . <br /> - Full characterization of waste water discharged to the <br /> industrial ponds. <br /> Pumping test in an area of contaminated ground water, <br /> including sampling and treatment of the contaminated ground <br /> water. <br /> However, this work does not complete the Remedial Investigation. <br /> The following additional tasks, at a minimum, must be proposed in <br /> a workplan: <br /> 1. Definition of the extent of ground water contamination off- <br /> site to the north of the base. Install and develop <br /> monitoring wells. Sample ground water and analyze by EPA <br /> Methods 601 and 602 quarterly. <br /> 2. Definition of vertical extent of ground water <br /> contamination on-site in Area 1. Install and develop <br /> monitoring wells. Sample ground water and analyze by EPA <br /> Methods 601 and 602 quarterly. <br /> 3 . Investigate potential source areas identified by recent <br /> aerial survey. Specifically, areas along the wastewater <br /> pipeline to the industrial ponds which appear to be leaking, <br /> and the large area near monitoring well LM21. <br /> 4 . Assess the impact of leaking underground tanks on ground <br /> water. Include the results of sampling and analysis <br /> obtained during removal of underground tanks at DDT in the <br /> Remedial Investigation report. <br /> 5. Assess the impact of the stormwater holding pond and <br /> wastewater percolation pond on the continuing spread of <br /> contaminated ground water. <br /> 6. Risk assessment to be included in the final report. <br /> 7. Interim remedial actions to reduce the migration of <br /> contaminated ground water, since implementation of final <br /> remedial actions appears several years away. <br />