ARCHIVED REPORTS_2018 REV SITE INV WK PLAN+

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01 05 January 2018 AdvanccdCseo AGE Project No. 14-3154 E r,}v i ro r 7 rii e n t a l Page 2 of 9 Cell. The cross-sections depicted in Figures 4 and 5 reflect the defined extents determined from previous subsurface investigations at the site. • Even though sidewall samples were not collected during the excavation of the waste cells, the northern and southern boundaries of the North and South Waste Cells have been defined. The limits of waste were thoroughly pre-determined prior to remediation with trenches excavated to depths of nine (9) feet bsg east of the South Waste Cell (T55); trenches to total depths of five (5) and ten (10) feet bsg south of the South Waste Cell (T49, T51, T52 and T60); trenches to nine (9) feet bsg north of the North Waste Cell (T45, T63 and T71); a trench to five (5) feet bsg east of the North Waste Cell (T69); and soil boring AB20, located just northeast of the North Waste Cell did not detect waste, just soil to the total depth. • Additionally, boring AB21, located between the North and South Waste Cells, along the eastern boundary, did not detect glass or waste; AB21 was advanced well before remediation. Prior to remediation, trenches defined the limits of waste between the waste cells. Trenches without waste were established between the well-defined limits of the waste cells, located west to east between the waste boundaries. The area between the waste cells was defined by trenches to depths between eight (8) feet bsg (T54) and five (5) feet bsg (T67, T73 and T74). • A significant portion of the waste was established with trenches (T64/T72 — north cell and T48/T58/T59—south cell) and soil samples collected under the waste prior to the removal action. The waste was removed from the eastern ends of both cells, and limits were defined. Native soil was visually observed in the trenches along the northern and southern boundary walls of the waste cells and the eastern sloped floor of the excavations. The cross-sections depict clean native soil, in contact with imported fill material. The western end of the cross-section shows the waste off-site. The investigation of the limits of the waste was all overseen on a daily basis by the San Joaquin County Environmental Health Department (SJCEHD) acting as Local Enforcement Agency for Cal-Recycle. The SJCEHD approval of the waste remediation plan was based on the adequate waste delineation provided, prior to waste excavation and final inspections. 2.0. BACKGROUND Between April 2015 and September 2015 and in May 2017, 110 trenches (T1 to T110) were excavated and nine soil borings were advanced within the former glass management area footprint, waste cells, and the surrounding areas to evaluate the lateral and vertical extent of buried waste. Selected trench and boring locations are illustrated in Figures 2 and 3; the cross-sections of the former waste cells are depicted in Figures 4 and 5.Additionally, an enlarged viewing area of the waste cells with proposed soil borings depicted in a grid layout is presented in Figure 3. Trenching logs are included in Appendix A.