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Preliminary Site Assessment PILKINGTON NORTH AMERICA — LATROP FACILITY 500 East Louise Avenue, Lathrop, California 1.0. INTRODUCTION At the request of Mr. Dana G. Perry of REYNOLDS & BROWN, Advanced GeoEnviron mental, Inc. (AGE) has prepared this Preliminary Site Assessment Work Plan for the property located at 500 East Louise Avenue, Lathrop, California (site). On- site structures and proposed boring locations are illustrated in Figure 2. The site property is located along the south side of East Louise Avenue in Lathrop, California, an incorporated area of San Joaquin County. The property comprises seven parcels (198- 120-08 main, 198-120-09 southern and 198-210-14 eastern) totaling approximately 113 acres. The scope of work includes advancement of numerous (up to approximately 40 might be required for the scope of work) soil probe borings for the collection of soil samples and groundwater samples to evaluate the presence, type, and extent of hydrocarbon- impacted or metals-impacted soil between 5 and 30 feet below surface grade (bsg), near the areas established as Recognized Environmental Conditions (REC). Two parcels will be included in the investigation, 198-120-08 (main) and 198-120-09 (southern). Minimum of 5 soil borings will be advanced in the areas of the 1992 oil pipe aboveground storage tank release, 4 borings will be advanced in the areas of the 1985 oil pipe line release, three soil borings will potentially be advanced in the basement area of the de-activated glass furnace line and up to 20 borings will be advanced in the areas of the southern parcel. Several mobilizations under this workplan and permit(s) will be required to complete the scope of work. Based on PNA Lathrop facility recognized environmental concerns (RECs), the following items will be evaluated: The presence of water quality degrading chemicals within the shallow upper aquifer, within an area of the property; Former glass dust waste streams on the southwestern portion of the property; leaking lubrication oil from the glass float line (planned soil excavation in 1993; A report of a 1985 straw oil line leak at the south edge of the property which reportedly in 1986 underwent investigation, a high- boiling petroleum distillate similar to gas oil used chiefly in purifying coke-oven gas and other industrial gases); REC6 - A report of a 1992 above ground storage tank fuel oil leak at the west side of the on-site transformer station on the property which reportedly underwent investigation and excavation; and other areas of the property simultaneously (later) deemed a REC. The work plan provides a description of the scope of work and procedures to be used for soil boring advancement, sample collection and analysis; and boring abandonment. The work plan was prepared as directed by San Joaquin County Environmental Health Department (SJCEHD) requirements for investigation of contaminated sites. Advanced GeoEnvironmental Inc.