ARCHIVED REPORTS_2019 SOIL MGMT PLAN (JULY-REVISED)

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Brusca File No. 137-002 Page 5 May 23, 2018 Murphy Parkway Property Waste Materials Reuse Workplan 4.0 WU1 WASTE EXCAVATION, STOCKPILING, SAMPLING/TESTING, AND EVALUATION Excavation, removal, and stockpiling of waste materials and associated soil within WU1 (capped area within the northwesterly portion of the subject parcel) was performed in April 2018 by Ramcon Engineering and Environmental Contracting. The work was overseen by a Certified Engineering Geologist from our firm; additionally, representatives of SJCEHD, the CVRWQCB, and CalRecycle observed the work. The work was performed in accordance with the agency- approved EMMP and associated Addendum referenced earlier in this Workplan. 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. 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). Five stockpiles of WU1 materials were created (identified as SP1 through SP5). Stockpiles SP1, SP2, SP3, and SP5 range in volume from about 1,000 to about 5,000 cubic yards. Stockpile SP4 is comprised predominantly of sizable cemented masses (boulder-size and smaller) of glass fragments in a fine-grained matrix; the volume of SP4 is quite small (less than 10 cubic yards). The total volume of stockpiled materials removed from WU1 is 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 Per the provisions of the EMMP, our firm collected verification soil samples below the removed wastes in the WU1 area, and we collected samples of the stockpiled materials removed from WU1 for analytical laboratory testing. The sampling was conducted by a Certified Engineering Geologist from our firm and was overseen by regulatory agency representatives. A total of 49 spatially distributed, random/representative samples of the WU1 materials was 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: • Total Petroleum Hydrocarbons as gasoline, diesel, and motor oil by EPA Method 8015B • SVOCs by EPA Method 8270C • Polychlorinated Biphenyls (PCBs) by EPA Method 8082 • Title 22 Metals Total Threshold Limit (TTLC) by EPA Method 6010/200.7 • Dioxins and Furans by EPA Method E1613 The results of the above-listed analyses performed on stockpiled materials from WU1 are presented on summary data tables attached to this Workplan; summary data tables from the