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• All Pure Chemical Company -3- Tracy Plant Chronology 31 Oct 89 Board letter with attached memo reviewing 26 July 1989 Technical Report and Assessment of Soil and Ground Water Contamination and 14 July 1989 Ground Water Monitoring Program. A revised work plan addressing Board's concerns was required to be submitted by 24 November 1989. The letter also stated that after chloroform contamination was confirmed by ground water monitoring, All Pure would be requu-ed to meet Chapter 15 requirements by retrofitting or eliminating the ponds. 13 Dec 89 All Pure submitted a 12 December 1989 Amendment to Ground Water Monitoring Program Work Plan. 27 Nov 90 Meeting between All Pure and Board staff to discuss status of wastewater management activities. Mr. Verrill Norwood of Pioneer Chlor Alkalai (owner of All Pure) stated All Pure was waiting to see if the treatment and recycling system at the Marysville plant was successful before deciding on wastewater management at the Tracy facility. Options being considered were: close all of the ponds and replace with the treatment system, close some of the ponds and replace with the treatment system, or keep all ponds in operation. All Pure also proposed to look at VOC/chloroform plume for sources and complete plume definition. Board staff informed All Pure they would be put on time schedule after they provided pertinent decisions and time estimates. 26 Feb 91 Letter from Pioneer discussing plans for installation of a water recycle facility at All Pure similar to the one at the Marysville facility. As part of an overall site plan being developed, water usage, water recycle, and stormwater handling were being evaluated. The overall site plan was expected to be complete in early September 1991, with the recycling system to be operational in late 1992. 18 Jul 91 Letter from Pioneer discussing results of the first of four quarterly samplings of MW-1 through MW-4. Chloroform detected in MW-1, MW-2, and MW-3. MW-4, the farthest downgradient well, had no detectable chloroform. MW-1 contained 14 ppb carbon tetrachloride. 19 Nov 91 Meeting between All Pure representative Mr. Norwood and Board staff to discuss recent findings from ground water sampling near All Pure and issues regarding operation and pond closure at All Pure. Recent sampling by Board staff indicated certain constituents possibly emanating from All Pure and Tracy Defense Depot (TDD) were detected in nearby domestic wells. The source of carbon tetrachloride in the domestic wells was uncertain. Board staff provided inspection reports and sampling results to All Pure. Board staff proposed to sample all wells in the area to help identify the source of carbon tetrachloride.