ARCHIVED REPORTS_2018 VERIFICATION RPT (DEC)

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Brusca File No. 137-002 Page 5 December 14, 2018 Murphy Parkway Property Waste Materials Management Verification Report 4.2 Excavation and Stockpiling of WU1 Materials Prior to removal of the waste materials from WU1, the clean soil cap materials were removed from this area and stockpiled along the northerly margin of the site. The thickness of the clean soil cap layer was observed ranged from about two to three feet. Subsequently, the underlying waste materials and associated soils were excavated with earthmoving equipment, removed from the WU1 area, and stockpiled directly to the south of the WU1 area on the property (see Plate 2). The thickness of the waste layer within the WU1 area was observed to be variable, and generally ranged from a few inches to about two feet. Within a relatively small area within the southerly portion of WU1, the waste materials extended to a greater depth (about six feet) below the cap materials (See Plate 3). To accomplish complete removal and segregation of the thin layer of solid waste materials, some of the overlying clean cap soils and underlying native soils were necessarily incorporated into the removed waste. Dust control measures (liberal sprinkling of exposed materials with a water truck) were implemented during soil waste excavation and stockpiling activities to limit or prevent airborne particles during the work. Our observations indicate that the work was performed in accord with the approved EMMP. Five stockpiles of WU1 materials were created (identified as SP1 through SP5). Stockpiles SP1, SP2, SP3, and SP5 ranged in volume from about 1,000 to about 5,000 cubic yards. Stockpile SP4 was comprised predominantly of sizable cemented masses (boulder-size and smaller) of glass fragments in a fine-grained matrix; the volume of SP4 was quite small (less than 10 cubic yards). The total volume of stockpiled materials removed from WU1 was on the order of 13,000 to 14,000 cubic yards. The stockpiles were covered with plastic sheeting, and the plastic sheeting was secured with sandbags to prevent wind disturbance. The approximate areas of origin of each of the five stockpiles are summarized below: Stockpile Origin Area within WU1 SP1 Northerly and easterly areas SP2 Westerly and central areas SP3 Westerly and central areas SP4 North central area SP5 Southerly area 4.3 Verification Soil Sampling/Testing beneath WU1 and Results Evaluation Per the provisions of the approved EMMP and Addendum, our firm collected verification soil samples below the removed wastes in the WU1 area generally on a grid pattern; the locations of the verification soil samples collected are shown on Plate 3. The sampling was conducted by a Certified Engineering Geologist from our firm and was overseen by regulatory agency representatives. The sampling was performed in accord with standard environmental protocol and the referenced workplan documentation. A total of 70 verification soil samples were collected. The samples were placed in laboratory-provided glass jars, immediately placed on ice, and transported to State- certified analytical laboratories under chain-of-custody for analysis for the following per the approved laboratory testing schedule (as depicted on Plate 3).