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MONITORING WELL INSTALLATION WORK PLAN 1.0 INTRODUCTION This is a work plan for installation of monitor wells and report of results at the Pilkington North America, Inc. (Pilkington) facility located at 500 East Louise Avenue (site), Lathrop, San Joaquin County, California (Figures 1 and 2, Appendix A). This work plan was prepared by Condor Earth Technologies, Inc. (Condor)at the request of Pilkington. This work plan satisfies Provision le of the Waste Discharge Requirements (WDR) Order No. 5-01-114 issued by the Central Valley Regional Water Quality Control Board (Regional Board) dated 24 May 2001. The requirements for this monitoring plan are specified in a Regional Board Document entitled Attachment C Items to be Included in a Monitoring Well Installation Workplan and a Monitoring Well Installation Report of Results (Appendix B). The primary objective of the work described in this workplan is to identify and evaluate potential impacts to groundwater quality resulting from the discharge of wastewater to land surfaces at the site. This information will assist Pilkington in complying with the Groundwater Limitations in the WDR. The installation, development, surveying, and sampling of five monitor wells is proposed to identify and evaluate potential impacts to groundwater quality at the site. This work plan includes project background information and a description of the proposed fieldwork, laboratory analyses, report preparation, and project schedule. The work described by this work plan will be conducted under the direct supervision of a California Registered Geologist or Professional Engineer. 2.0 SITE BACKGROUND INFORMATION Pilkington operates a float glass furnace facility at the site. The facility stockpiles raw material, manufactures glass products, and warehouses products prior to shipment. Pilkington estimates approximately 587,600 gallons of wastewater are generated daily from groundwater infiltration, float glass manufacturing, tempered and laminated glass manufacturing, cooling tower and boiler blowdown, reverse osmosis reject water, and domestic wastewater. Domestic wastewater is disinfected prior to commingling with the process water. The area within the site boundaries consists of approximately 176 acres. Approximately 75.4 acres are available for land application of wastewater. Wastewater has been applied to the lawn areas (11.4 acres) by sprinklers, Site A (42 acres) by flood irrigation, and Site C (8.5 acres) by sprinklers. The site layout is shown on the map on Figure 2. The potential impact of water storage and discharge to land is regulated by the WDR cited above. The site is located on Assessor's Parcel Numbers 195-270-62 and 195-270-64 in Section 35, TIS, R6E, MDB&M. Topography is nearly flat, which is typical of the San Joaquin Valley of California, at an average elevation of 15 feet. Soils at the site are classified as urban land and Timor loamy sand (United States Department of Agriculture, Soil Survey of San Joaquin County, California). Timor loamy sand is moderately well drained and deep to a hardpan. Annual evapotranspiration potential is approximately 29 inches and annual precipitation is on the order of 11 inches,most of which occurs in the months between November and April. Groundwater exists approximately 9 feet below ground surface(bgs). Groundwater flows to the north but may be locally influenced by dewatering activities at the cullet sump and by groundwater extraction wells operated by the adjacent J.R. Simplot Corporation.