ARCHIVED REPORTS_2018 REV SITE INV WK PLAN+

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Brusca File No. 137-002 Page 3 May 7, 2018 DRAFT Murphy Parkway Property Waste Materials Reuse Workplan Solid wastes comprised largely of waste glass materials were handled within the northwesterly portion of the subject 48-acre site; the vast majority of waste glass materials historically handled and temporarily stored in this area were hauled from the property in the past to offsite disposal locations. Glass manufacturing activities at the former PNA facility were discontinued several years ago. In recent years, the subject 48-acre parcel generally has been unused, except for some livestock grazing. Treated industrial and domestic waste water, as well as storm water, generated at the former PNA facility northerly of the subject property was disposed at that facility, and also on the subject 48-acre parcel via spray irrigation. The waste water discharge was performed under permit with the CVRWQCB. Because the subject 48-acre property is no longer intended for waste water discharge, the CVRWQCB is currently in the process of removing this area from the waste water discharge permit. Past Onsite Waste Investigations and Remedial Work It is indicated that the handling of glass wastes on the subject property ceased in the 1980s. Around 2012, the local oversight agency (the San Joaquin County Environmental Health Department [SJCEHD]) required the placement of a clean soil cap over the northwesterly portion of the property (WU1 area) where a thin layer of residual glass wastes was known to exist at the site surface. A Soil Cover Workplan was prepared in early 2013, and the capping work was implemented in late 2013.4 The area of the cap (WU1 area) is shown on Plate 2. Starting in 2014, a substantial amount of investigation, waste characterization, and waste removal work was implemented on the subject parcel by AGE with direction and oversight by the SJCEHD. This work included: • a significant number of explorations (test pits and borings) within the capped area and other site areas, including areas to the south and east of the capped area. • a geophysical survey (involving ground penetrating radar and a magnetometer survey) on the westerly portion of the property to identify any unknown areas of disturbed materials/buried wastes. The geophysical and trenching work reportedly identified two areas (approximate 2,000 square feet each in plan area) of deeper disturbed materials/wastes along the far westerly margin of the property and outside of the cap area. These areas were identified as the South Waste Cell (SWC) and the North Waste Cell (NWC). The SWC and NWC waste materials subsequently were completely excavated and removed from the parcel for offsite landfill disposal. • collection of samples of soil and waste materials from WU1, SWC, and NWC areas, as well as from other site areas for analytical laboratory testing. AGE’s investigative, remedial, and characterization work associated with solid wastes on the subject parcel was summarized in a Site Assessment Summary Report dated December 21, 2017.5 4 Antea Group; “Soil Cover Workplan, Former Cullet Staging Area, Pilkington North America, Inc., 500 East Louise Avenue, Lathrop, California”; May 22, 2013. 5 AGE; “Revised Site Assessment Summary Report, 17100 Murphy Parkway, Lathrop, San Joaquin County, California, Solid Waste Information System (SWIS) Number 39-CR-022 (APN 198-120-09); January 10, 2018.