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• ORDER N0. 99-079 INFORMATION SHEET NESTLE USA-BEVERAGE DIVISION INC. RIPON FACILITY SAN JOAQUIN COUNTY Nestle USA-Beverage Division Incorporated owns a former manufacturing plant in Ripon, San Joaquin County. The manufacturing plant was built in the 1930's and was initially used for the production and processing of dairy products. From 1957 and until 1970, trichloroethylene (TCE)was used to extract caffeine in the decaffeination process for manufacture of instant coffee. In 1985,the Discharger sampled two on-site production wells. Analytical results indicated the presence of TCE. The Discharger has operated an interim groundwater extraction and granular activated carbon treatment system since 1986 to remediate TCE contaminated groundwater. Treated groundwater is zone analysis and groundwater elevation measurements indicate that only the center of the TCE plume is being remediated and additional remedial actions are necessary to clean up the remainder of the plume. The former manufacturing plant is surrounded by several municipal supply wells, irrigation wells and industrial supply wells which greatly influence the groundwater flow in this area. Two municipal supply well operated by the City of Ripon have been affected by Nestle's TCE plume and the City has installed granular activated carbon treatment on one of these wells. One domestic supply well has been contaminated with TCE. The owner of this well has been supplied with bottled water by the Discharger. The City of Ripon and the Discharger are currently arranging a permanent alternate water supply. The Discharger proposes to test an innovative approach for providing cleanup of the most contaminated portions of the aquifer. This approach involves injecting the chemical potassium permanganate into the aquifer which allows insitu chemical oxidation of TCE to take place. The discharge of potassium permanganate will generate several by-products which can degrade water quality. Chemical oxidation of VOCs may increase the total dissolved solids (TDS) concentrations and chloride concentrations within the treatment zone. Potassium permanganate injection may also reduce the permeability of the aquifer because of build up of manganese oxides on the soil grains of the aquifer. Bench-scale testing conducted by the Discharger shows that aquifer properties would not be adversely effected and that chloride and TDS concentrations would only increase slightly above background levels. To assure that potassium permanganate by-products and untreated TCE do not migrate beyond the pilot test zone,the Discharger proposes to provide control measures which will include pumping from one existing groundwater extraction well. If potassium permanganate injection is effective in remediating the TCE plume in the pilot test area,this approach would provide more efficient remediation of the TCE plume and significantly reduce the anticipated cleanup time of the aquifer versus only using pump and treat to remediate the groundwater. Surface water drainage from the facility is to the Stanislaus River. RRR 19 May 1999