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27 October 2017 AdvancedGeo AGE Project No. 14-3154 Environmental Page 2 of 4 ? M �G PREIVIOUS WASTE DISPOSAL During the investigation of the former PNA site, minor percentages of glass were encountered in most of the trenches. A set of trenches at the southwest boundary of the property demonstrated a differing thickness (topology) of the buried waste. Trenching logs are included in Appendix B; while the cross section of buried waste is depicted in Figure 4. Two waste cells of approximately 2,000 square feet of area each (30 to 35 feet north - south to soil and 65-70 feet east -west) had demonstrated some waste glass and debris; the southern cell was approximately eight feet deep and the northern cell was approximately thirteen feet deep. The majority of the waste stream was comprised of steel parts or window components (rusted), glass, and minor plastics. Excavations removed the waste from the waste cells and adequately defined the horizontal and vertical extent of the buried waste, on the property to the western boundary. Excavation was required to a depth of 13 feet at some locations (north cell), through the use of an excavator (removing the encountered waste) to reach native soil. The waste was transported from the site to a Class II landfill in December 2015. Approximately 3,567 tons of waste glass, minor garbage and cover soils were disposed. The waste glass/metal was loaded into end dump trucks for transport to Forward Landfill under special waste manifest. A plastic sheet barrier was installed at the western edge of the property boundary, prior to backfilling native clean soil from the property area undisturbed by waste handling. Additional waste was observed off the site to the west, on the property at 17200 Murphy Parkway. SCOPE OF WORK The following scope of work was prepared in accordance with an email directive, dated 26 October 2017, from the San Joaquin County Environmental Health Department Local Enforcement Agency (LEA). Waste Handling Area AGE proposes excavating trenches to re -sample and collect additional samples of the glass cullet and waste in the flat, soil covered, waste handling area. The results of the sampling will provide additional information to characterize and define the extent of waste in this area of the property. AGE proposes to excavate up to six (6) trenches to six feet below surface grade in the covered waste handling area (as the depth of waste was already determined). The re -trenching of this area is to identify the exact limits of buried glass waste (ends) and collect additional samples for waste characterization (Figures 2 and 3).