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All Pure Chemical Company -5- Tracy Plant Chronology 5 Feb 92 Letter from Mr. Norwood stating arrangements had been made with the Tracy WWTP to accept excess water from All Pure when necessary. All Pure proposed to use this disposal to keep water balance at the plant within reasonable limits. 18 Feb 92 Board letter requesting RWD 20 days from date of letter. 25 Feb 92 Letter from All Pure requesting 30 day extension, from 1 March 1992, to complete RWD. Board approved in phone call. 1 Apr 92 All Pure submitted RWD and filing fee. 22 Jul 92 Meeting between Mr. Norwood and Board staff to discuss tentative WDRs and the Board's regional ground water sampling event. Board staff proposed to send draft WDRs to All Pure by 7 August 1992, send tentative WDRs out for public comment by 25 August 1992, and have the WDRs adopted at the 25 September 1992 Board meeting. Board staff also proposed to sample monitoring wells MW-1 through MW-4 and one deep well during the upcoming regional ground water sampling event. 15 Nov 92 Meeting between Mr. Norwood and Board staff to discuss wastewater management program. Due to personnel changes, no decision yet made on water recycling program. Mr. Norwood has taken over responsibility for evaluating the feasibility of the program. He stated additional time was necessary to complete study because of recent changes in product mix. Mr. Norwood proposed to provide schedule for either pond closure or retrofitting in December 1992. Board staff stated the draft WDRs would not be finished until after the information was received in December 1992. 5 Mar 93 Letter from All Pure providing an attached report summarizing the environmental evaluations and assessments which have been made on the ground water and requesting Board help in dealing with the petroleum hydrocarbon plume from the railroad right-of-way on the east side of the plant. Conclusions by All Pure summarized from several reports include: there are two plumes onsite - a hydrocarbon plume from the pipelines in the railroad right-of-way is present on the All Pure site and a sodium/calcium/chloride/chloroform plume from the ponds, with carbon tetrachloride, chloroform, 1,1 DCA, 1,1,1 TCA, and 1,1 DCE in MW-1 and MW2 from an offsite source; ground water flows southwest from the railroad tracks toward the property; diesel fuel is present onsite to the east of the tank farm in soil and ground water between a spur of the railroad and the eastern property boundary; and no contamination has been detected in soil or ground water of MW-4, which is the farthest downgradient monitoring well.