SITE INFORMATION AND CORRESPONDENCE

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11 July 1991 Proposed Plan -2- 26 August 1991 DDRW, Tracy Monitor Wells (Method of Analysis) Freouency LM-11, LM-12, Temperature, pH and Electrical Conductivity Quarterly LM-63 Metals including Arsenic, Selenium and Mercury (Methods 6010, 7060, 7740, 7471) 2. It is not necessary for Tracy to sample all on- and off-site monitor wells. This proposal is excessive. Tracy should sample and analyze those wells which have the highest concentrations of volatile organic constituents (VOCs) in the center of the plumes, the wells at the leading edges of the VOC plumes, those wells which are down gradient of waste management units and a representative number of up gradient wells. The following wells should be sampled and analyzed and should be sufficient to develop the data needed to complete the Risk Assessment. Monitor Wells Rationale for Selection LM-11 Most up gradient well along western boundary of site. LM-9, LM-10, Wells are up gradient of medical supply burial , embalming fluid LM-13 dump, lube oil dump and pesticide disposal trench. LM-21, LM-22, Wells are down gradient of medical supply burial , embalming o LM-14 fluid dump, lube oil dump and pesticide disposal trench. LM-43 Well is near the sump from Recoup. LM-26 Well is upgradient of Building 28, Area 4 plume. LM-17, LM-87, Cluster well site with highest VOC concentrations in Area 4. LM-92 LM-32, LM-33, Cluster well site in center of Area 3. LM-34 or LM-58, LM-59, LM-60 LM-76 Well at leading edge of the VOC plume off-site. LM-63, LM-64, Off-site Cluster wells with no concentrations of LM-65 trichloroethylene (TCE) and tetrachloroethylene (PCE) . LM-18 or LM-19 Down gradient wells of hazardous materials storage areas. LM-42 Up gradient well from battery acid sump and Buildings 201 and 206. LM-24 Down gradient well from battery acid sump and Buildings 201 and 206. LM-25 Well with highest concentration of TCE. LM-16 Well is near old industrial waste lagoons.