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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 99-079 WASTE DISCHARGE REQUIREMENTS NESTLE USA- BEVERAGE DIVISION INC. FORMER RIPON FACILITY SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board)finds that: 1. Nestle USA-Beverage Division Incorporated (herd after Discharger) is a wholly owned subsidiary of the Nestle Holdings. The Discharger owns a former manufacturing plant in Ripon, San Joaquin County. The plant is in the NW-1/4 of Section 29, T2S,RBE, MDB&M and is approximately three quarters of a mile north of the Stanislaus River (shown on attachment A). 2. The manufacturing plant was built in the 1930s and was initially used for the production and processing of dairy products. After 1948 and until 1986, the plant manufactured instant coffee. Beginning in 1957,trichloroethylene (TCE) was used to extract caffeine in the decaffeination process. Methylene chloride was used in place of TCE, beginning in 1970. After 1986, no volatile organic constituents (VOCs) were used at this facility. 3. In 1985,the Discharger sampled two on-site production wells,NI and N2. Analytical results indicated the presence of a TCE plume. Since 1985,the Discharger has installed a total of 56 monitoring wells and has conducted several soil and groundwater assessments at the facility and in its vicinity to determine the extent of TCE in groundwater. Groundwater analytical data indicate, in addition to TCE,the presence of cis 1,2-dichloroethene(cis- 1,2-DCE), 1,1-dichloroethene(1,1-DCA), 1,1,1-trichloroethene(1,1,1 TCA), 1,2-dichloropropane (1,2-DCP), carbon tetrachloride(CCL4), tetrachloroethene (PCE), vinyl chloride(VC), chloroform. The Discharger believes that PCE, CCL4 and 1,1,1 TCA are not associated with the former activities at the Nestle Facility. 4. In 1993 the Board adopted Cleanup and Abatement Order No. 93-712 requiring the Discharger to clean up the soil and groundwater contamination and submit technical reports according to a time schedule. 5. The Discharger has operated an interim groundwater extraction and Granular Activated Carbon (GAC) treatment system since 1986. The system includes one groundwater extraction well EI-1. Treated groundwater is discharged to the industrial sewer line to the City of Ripon Publicly Owned Treatment Works (POTW). 6. Capture zone analysis performed by the Discharger indicate that only the center of the plume with the highest concentrations of TCE is extracted and additional remedial actions are necessary to clean up the remainder of the plume. The Discharger proposes to install a full-scale groundwater extraction and treatment system to achieve this. The groundwater flow is greatly influenced by pumping from municipal supply wells, irrigation wells to the north of the facility,and industrial production wells to the southeast of the facility. 7. The City of Ripon Municipal Supply Wells surround this facility. Two wells have been affected by Nestle's TCE plume and the City has installed GAC wellhead treatment on one of the wells,