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August 11, 2000 - 1 - 003-7170 1.0 INTRODUCTION This document is a workplan for additional ground water characterization at the Owens-Brockway Glass Containers facility located at 14700 Schulte Road, Tracy, California (Figure 1). The workplan has been prepared in response to Waste Discharge Requirements Order No. 5-00-056 (WDRs) issued for the site by the California Regional Water Quality Control Board (RWQCB). The WDRs were adopted on March 17, 2000. The additional ground water characterization is being conducted to determine impacts to ground water from the process wastewater ponds at the Owens-Brockway facility. 1.1 Site Description The Owens-Brockway facility is located in western San Joaquin County, Tracy, California. Land use in the vicinity of the site is primarily industrial. Adjacent land use includes the Biomass Recovery facility located immediately north of the site; former Federal Aviation Administration(FAA)Tracking Station west of the site; and a Southern Pacific Railway line south of the site (Figure 1). The area immediately east of the facility is currently undeveloped. The Owens-Brockway facility currently generates approximately 18,000 gallons per day of process water, which is discharged to Wastewater Ponds 1, then sequentially to Wastewater Ponds 2 and 3 through gravity drainage piping. Ponds 1, 2, and 3 wastewater is disposed of through evaporation and percolation into the underlying soils. Figure 2 shows the location of the process wastewater ponds. The total capacity of Ponds 1, 2, and 3 is estimated to be 1.82 million gallons (243,000 cubic feet). This estimate is based on the results of a topographic survey of the ponds performed by Ronald Greenwell and Associates, of Antioch, California on June 2 and June 13, 2000. The site's water supply consists of ground water pumped from an on-site supply well(shown in Figure 2) that is used for both domestic purposes and glass manufacturing processes. The supply water (ground water) is passed through an on-site reverse osmosis (RO) unit to reduce naturally occurring total dissolved solids (TDS) before being used for glass manufacturing processes. The RO reject water is discharged directly to Pond 1. During glass manufacturing,process water drains to one of two sumps; the A/B cullet water API (American Petroleum Institute) separator, or the C cullet water API separator. In addition, water from floor washing, from shear spray, from minor overflow from quench tubs, and from a parts steam cleaning room, also reports to the A/B cullet water API separator. Water is pumped from the API separators and recirculated in the process circuit. If the water level in the separators becomes too low, water is added directly to the separators from the supply well. If the water becomes too high in either separator, it is pumped directly to Pond 1. Storm water collected in the plant site drains by gravity via surface drainage and piping to five storm water ponds (Ponds 4 through 8) as shown in Figure 2. Most storm water collected in the plant area flows to Pond 4. We understand that Ponds 6, 7, and 8 collect water only under severe storm events. Another source of water to Pond 4 is from cullet tubs. Hot glass bathed in water is conveyed in cullet tubs. Residual water, estimated to be about 1,000 to 1,500 gallons per day, often spills from the tubs during handling, which in turn follows the same path as storm water to Pond 4. Prior to furnace repairs, furnace water is also drained to Pond 4. On average, one of the three furnaces is drained every three years, delivering '/2 to'/4 million gallons to Pond 4. Currently, when the process wastewater ponds (Ponds 1, 2, and 3) are at capacity during peak flow or upset conditions, Owens-Brockway discharges the RO reject water directly to Stormwater Pond 4. During severe upset conditions, portable pumps are mobilized at the crest of Pond 3 to pump water to R00-37.doc Golder Associates