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WASTE DISCHARGE REQUIREMENTS NO. 5.00-056 4- O W ENS-BROCK W A Y OWENS-ILLINOIS GLASS FURNACE FACILITY SAN JOAQUIN COUNTY 14. The depth to groundwater and flow direction has been measured in on-site groundwater monitoring wells. The monitoring wells are screened in the first encountered water bearing zone. Groundwater exists approximately 50 feet below ground surface (bgs); groundwater flows to the north-northeast, consistent with site topography. Below the first water bearing zone exists a silty clay aquitard from 70-170 ft. bgs. 15. Groundwater sample events were performed on 30 June 1995, 22 August 1996, and 18 May 1998; the results of the chemical analysis of the samples indicates groundwater - downgradient of the process wastewater ponds has been impacted by process wastewater infiltration to groundwater. Groundwater located doNNmgradient of the process wastewater ponds contains elevated total dissolved solids,'electrical conductivity, and other compounds consistent with compounds contained in the process Wastewater as shown below: Range for MW-2 Range for MW-3 Constituent Units (Uoeradient Well) (Downgradient Well) Calcium mg/l 9.2-27 140-170 Chloride mg/l 86-240 400-510 Conductivity µmhos/cm 1,000-1,S00 2,800-3,400 Hardness (CaCO3) mg/l 44-140 720-780 _ Magnesium mg/l 7.7-17 76-84 Sulfate mg/l 89-240 710-870 TDS mg/l 650-1,100 2,100-2,800 Notes: TDS denotes Total Dissolved Solids. Data from Nolte Associates, October 1996 and Golder Associates June, 1998. 16. In order to determine compliance with the groundwater and surface water limitations contained herein, these WDRs contain a time schedule for development and implementation of a formal groundwater monitoring program. 17. The Board adopted a Water Quality Control Plan, Fourth Edition, for the Sacramento River and San Joaquin River Basins (hereafter Basin Plan), which contains water quality objectives for waters of the Basins. These requirements implement the Basin Plan. 18. The facility is on the east side of the Delta Mendota Canal Section 36, T2S, R4E, MDB&M with surface water drainage to the Upper Main Canal, as shown in Attachment A. 19. The site lies within the San Joaquin Valley Floor Hydrologic Unit No. 543, as depicted on interagency hydrologic maps prepared by the Department of Water Resources in August 1986. 20. The beneficial uses of Upper Main Canal are agricultural, municipal, recreation, freshwater habitat, and wildlife habitat.