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05 January 2018 AdvancedCreo AGE Project No. 14-3154 E nvironMental Page 4 of 9 generally low or typical for "background" on commercial land. Additional detailed background information was presented in the Site Assessment Summary Report, dated 21 December 2017. 3.0. WASTE REMEDIATON The data collected from trenches established along the western boundary of the site identified two significant waste cells, the North and South Waste Cells. The waste cells had varying thickness (topology) and extents of buried glass waste and debris. Generally, buried waste ranged from 18-36 inches below native soil (T46) to a maximum depth of 10 feet bsg (T58) in the South Waste Cell, and to a maximum depth of 13 feet bsg in the North Waste Cell (T65). The North Waste Cell was excavated to a maximum width of 40 feet (north to south) and maximum length of 95 feet (east to west); and the South Waste Cell was excavated to a maximum width of 35 feet (north to south) and maximum length of 100 feet (east to west). The maximum area of the North Waste Cell excavation area was approximately 3,800 square feet and the maximum area of the South Waste Cell was approximately 3,500 square feet (Figure 3). The North Waste Cell was excavated to a maximum depth of just below 13 feet bsg to remove the waste and reach native soil; the South Waste Cell was excavated to a maximum depth of just below 10 feet bsg to remove the waste and reach native soil. However, both waste cells were not excavated to the maximum depths of 13 and 10 feet bsg across the entire excavation areas. The total depth of buried waste decreased towards the east of both waste cells, therefore excavation to maximum depths was not necessary towards the eastern boundaries of both waste cells (Figures 4 and 5). The excavation aerial extent(area) and former limits of buried glass/material waste is depicted in Figure 3. The waste identified on the subject property, in the North and South Waste Cells was locally removed to the western property contact (vertical) or 17200 Murphy Parkway. The excavations removed all the waste from the waste cells located on the subject property and adequately defined the horizontal and vertical extent of the buried waste to the western boundary. However, waste placed under soil cover is present on the adjacent parcel (17200 Murphy Parkway) west of the subject property and this waste material is estimated to be over ten (10) feet in thickness. The cross-sections of the excavation areas/removed waste are depicted in Figures 4 and 5. Based on measurements of the excavated areas, a volume of approximately 2,200 cubic yards of waste and soil was removed. Based on industry standards, factors ranging between 1.2 and 1.7 are typically used to convert cubic yards of excavated bulk soil/materials into tons. However, AGE reviewed a table of conversion factors used by the California Integrated Waste Management Board (Appendix B). Based on the table, conversion factors between 1.1 (glass) and 1.5 (brick) could be used to estimate the weight of the material excavated based on the approximate volume. However, the conversion factors listed are based on landfill disposal and not compacted materials that were excavated for disposal. There is no specifically established factor to convert cubic