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0 -2- All Pure Chemical Company Tracy Plant Chronology 2 May 89 Board letter requesting All Pure to file a RWD for the wastewater ponds and a work plan and time schedule to implement ground water monitoring. Work plan due by 19 May 1989, with RWD due after ground water monitoring in place. Letter informed All Pure that retrofitting of ponds to meet Chapter 15 standards may be required. Eventual disposition of ponds dependent upon ground water monitoring results. 16 May 89 All Pure letter requesting 60-day extension for work plan for ground water monitoring based on evaluation of the performance of the wastewater treatment system at the Marysville facility. 13 Jun 89 Telephone conversation in which Board staff granted All Pure's request for a 60-day extension for submittal of the work plan. 14 Jul 89 All Pure submitted Ground Water Monitoring Program. Work plan proposed to install three monitoring wells 15 to 30 days after Board approval. Analyses and ground water flow gradients to be submitted 30 days after well installation complete. 31 Jul 89 All Pure submitted a 26 July 1989 Technical Report and Assessment of Soil and Ground Water Contamination. This report was completed to investigate subsurface hydrocarbon contamination identified during an agricultural impact evaluation in the vicinity of All Pure. The agricultural impact evaluation was conducted to determine if a pond overflow earlier in the year had any detrimental effects. As part of the investigation, six soil and five water samples from five boreholes were collected along the fence line east of the wastewater ponds. Additional soil and water sampling was conducted in three boreholes west of the ponds. Two separate plumes were identified. A plume of high concentrations of high boiling point and purgeable hydrocarbons was identified in a relatively narrow band along the eastern property line of the site. The highest concentrations of these hydrocarbons in soil and ground water were detected to the east of the wastewater ponds and south of Ponds 1 and 2. A plume of chloroform north and west of the hydrocarbon plume was also identified. Chloroform was detected in soil from two borings, both east of the wastewater ponds, one boring between Ponds 1 and 2 and one boring east of Pond 2. Chloroform in ground water was detected in these two borings east of the wastewater ponds and in one boring west of the wastewater ponds between Ponds 2 and 3. The highest chloroform in soil and ground water was detected in the boring east of the wastewater ponds between Ponds 1 and 2. The two onsite production wells were also sampled and did not contain any VOCs. The report proposed to conduct a magnetic survey to locate the underground tank installed in 1947 for the alfalfa dehydrating plant.