ARCHIVED REPORTS_2019 SOIL MGMT PLAN (JULY-REVISED)

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22 February 2019 AGE-Project No. 14-3154 Page 4 of 12 (Cogen) facility and current development of an 870,000 square-foot warehouse for commercial and light industrial purposes, and to the east by the former Occidental Chemical Company (Oxy Chem) and current JR Simplot Company (JR Simplot) sites. In the early 1960s, the Former PNA Facility was constructed at the subject property. A vast majority of the waste glass formerly stored at Parcel A and Parcel B was removed during the facility’s operation and disposed off-site. Some glass processing waste was handled in the area identified as WU1. In 1986, the handling of glass processing waste in WU1 was terminated. In December 2013, cover (native soil) was placed over a thin layer of residual waste materials in WU1 and this area was sloped for drainage. As described in previous reports (see Section 4.0.), WU1 was thoroughly investigated and defined on Parcel B by investigations performed at the site; and waste materials from WU1 on Parcel B were removed to below acceptable screening levels. However, during waste removal activities, it was discovered that WU1 extends beyond the northern border of Parcel B and onto the small elliptical area of Parcel A shown in Figure 3. In 1993, the Former PNA Facility was issued SWIS number 39-CR-0022 and assigned to the LEA at the EHD. SWIS number 39-CR-0022 was assigned to the disposal area (disposal site) determined at that time to be parcels 198-120-08 (500 East Louise Ave) and 198-120-09 (17100 Murphy Parkway). The area of SWIS 39-CR-0022 was eventually expanded to include the neighboring Cogen property to the west (APN 198-120-05; 17200 Murphy Parkway). Based on discussions with EHD it was determined that Disposal Site 39-CR-0022 includes two suspected disposal areas in the southwest corner of Parcel A. As mentioned above, this Plan only addresses disposal area WU1 located along the southern border of Parcel A. PNA later purchased the property and was also designated a responsible party; and Nippon Sheet Glass (NSG) later purchased PNA. In February 2015, the ownership of the property changed again; the property was sold to R&B Louise, LLC, R&B Delta LLC and ASP/RWM Properties. The current property owner contact information is below: R&B Louise, LLC R&B Delta LLC 1200 Concord Avenue, Suite 200 Concord, California 94520 (925) 674-8400 ASP/RWM Properties, a California General Partnership 2228 Livingston Street Oakland, California 94606 6.0. SITE CHARACTERIZATION Excavation, removal, and stockpiling of soil and waste materials from WU1 on Parcel B to the south of the subject Parcel A was performed in April 2018 under the supervision of