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23 May 2023 Project No. 14-3154 Page 2 of 7 AdvancedGeo An Employee- Owned Company The Former PNA Facility includes a large warehouse structure formerly utilized for manufacturing glass, two smaller stand-alone warehouse structures, and asphalt parking areas. 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 (17100 Murphy Parkway) was removed during the facility's operation and disposed of off-site. In 1993, the Former PNA Facility was issued Solid Waste Information System (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 portions of parcels 198- 120-08 (500 East Louise Ave; now parcel 198-120-120) and 198-120-09 (17100 Murphy Parkway), located south of the existing railway and fenced perimeter of the PNA facility. The area of SWIS 39 -CR -0022 was eventually expanded to include the neighboring San Joaquin Cogeneration property to the west (APN 198-120-05; 17200 Murphy Parkway). Based on EHD and CVRWQCB conclusions, they determined that SWIS 39 -CR -0022 includes two suspected disposal areas in the southwest corner of Parcel A: (1) an area located in the southwest corner of the parcel in the proximity of T-29; and (2) the area located on the southern border of the parcel where Waste Unit 1 (WU1) has been identified to extend onto Parcel A. The current property owner disputes the conclusion that the area in the proximity to T-29 is a suspected disposal area. The preliminary data does not support this conclusion and the suspected disposal area identified by the SWIS designation was to the south of the existing railway and the fenced southern property boundary of the PNA facility; T-29 is to the north of both of those site features. Historically, small pieces of glass cullet were gathered and stored on concrete pads in areas north of the railway and fenced southern boundary pending recycling. Glass was only stored and managed north of the railway, no disposal areas have been encountered north of the railway, including during this investigation. The scope of work included investigating only the southwest corner of the parcel in proximity to T-29. In late 2017, the southwest corner of the subject property, in the location of T-29, was graded, surfaced with asphalt, and developed into a parking area. At that time, no evidence of waste or any waste pits were observed by the property owner in this location. On 24 November 2017, the property owner took photographs of the southwest corner/T-29 area after grading but before surfacing. There is no evidence of waste in the photographs. The photographs are presented in Appendix C. 3.0. SOIL PROBE BORING ADVANCEMENT On 30 March 2023, AGI advanced a total of fifteen soil borings (T29131 through T291315) at the site under San Joaquin County EHD boring permit (Appendix D). Borings T29131 through T291315 were advanced in and around the former location of trench T-29 (Figure 3). Borings T29131 and T29132 were advanced to 11 feet below surface grade (bsg) and the remaining borings were advanced to 10 feet bsg utilizing a Geoprobe