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Soil Cover Work Plan, Former Cullet Staging Area Pilkington North America, Inc. 500 East Louise Avenue, Lathrop, CA a me a g ro u p Antea Group Project No. PILKCU3215 2.1 FORMER CULLET STAGING AREA, HISTORICAL AERIAL PHOTO REVIEW The former cullet staging area is located south of the western part of the main glass plant (Figure 2). Historical aerial photographs were obtained from Environmental Data Resources, Inc. (EDR) to research former uses of the site. A review of the photographs appears to indicate that cullet was first placed on the storage area sometime between 1963 and 1974. EDR Aerial photos are included as Appendix A. Between 1974 and 1982, soil was excavated from east of and likely south of the staging area. A depression exists to the east of the staging area and evidence of a former ponding area appears south of the staging area. It is likely the excavated areas were used to obtain soil for the construction of an earthen berm/levee on the south side of the railroad tracks between the plant and the staging area. The earthen berm/levee was either constructed with the access road passing through it to the plant or to provide access to the former cullet staging area. Because of the access road passing through the berm, the berm or levee would be ineffective in the event of flooding from the Calaveras River which is located approximately 1.3 miles west-southwest of the site. The cullet was removed from the site sometime between 1993 and 2005. Cullet is an essential component in the manufacture of float glass, and as such, this stored material was utilized by the plant to produce finished product. Photographs from 2005 and 2006 showed that the cullet storage area had been graded flat. The area of excavation east of the staging area remains a rectangular shaped depression. Based on a review of the historical photos and observations, the area previously used for cullet staging was east of the west access road and south of the earthen berm/levee. For this work plan, the total area has been divided up into three separate areas. These areas are identified on the attached Figure 2, and described below: • Area 1: The southern portion of the area, approximately 167 feet in the east/west direction and 100 feet in the north/south direction for an estimated area of 16,700 square feet. • Area 2: The northwest portion of the former cullet storage area, approximately 420 feet in the north/south direction and approximately 167 feet in the east/west direction for an approximate area of 70,140 square feet. • Area 3: The northeast portion of the former cullet storage area (adjacent east of Area 2), approximately 177 feet in the east/west direction and approximately 346 feet in the north/south direction for an approximate area of 61,241 square feet. The combined total of the three identified areas is approximately 148,081 square feet. In addition to the use of the area for cullet storage and staging, inert materials such as old concrete foundations, reinforcing steel, and plastic were observed in this area. Prior to implementation of a work plan, a general cleanup of the site will be performed to remove exposed inert construction debris. 2 www.anteagroup.com