ARCHIVED REPORTS_2023-NOV 17 WASTE UNIT 1 VERIFCATION RPT

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837 Shaw Road • Stockton, CA 95215 Telephone (800) 511-9300 • Fax (888) 445-8786 17 November 2023 Project No. 14-3154 Nathan Casebeer Central Valley Regional Water Quality Control Board 11020 Sun Center Drive #200 Rancho Cordova, California 95670 Subject: Waste Unit 1: Verification Sampling Results and Waste Disposal FORMER PILKINGTON NORTH AMERICA – LATHROP FACILITY 500 East Louise Avenue, Lathrop, California Dear Mr. Casebeer: At the request of the current property owners, ASP/RWM Properties LLC, R&B Louise LLC and R&B Delta LLC, AdvancedGeo, Inc. (AGI) has prepared this letter to report the results of verification sampling and to document waste disposal performed at Waste Unit 1 (WU1), situated in the far southwesterly portion of the property located at 500 East Louise Avenue, Lathrop, California (herein referred to as subject property or site). The location of the site is illustrated in Figure 1; the excavated area, trenching locations, and verification sample locations are illustrated in Figure 2; and a site plan depicting the soil stockpile locations is presented in Figure 3. Between 18 March and 25 March 2019, the capped waste area identified as WU1 was excavated and removed from the southwesterly portion of the subject property and stockpiled. The WU1 area was excavated to depths between 2.5 and 5.0 feet below surface grade (bsg). One area directly northwest of Trench-10 (T10) was excavated to approximately 6.5 feet bsg. The final WU1 excavation area encompassed approximately 28,000 square feet (Figure 2). Excavated soil was placed in three large stockpiles to the east of the excavation area (SP-1 through SP-3) and the stockpiles were covered with plastic and the covers anchored. The stockpile locations are depicted in Figures 2 and 3. At the direction of the San Joaquin County Environmental Health Department (EHD), fifteen (15) trenches were advanced within the excavation area on 08 and 09 April 2019 to confirm that the limits of WU1 had been removed (T1 – T15). The trenches were excavated to depths between 5.0 and 6.5 feet below excavation grade; therefore, trenches were excavated to depths between 7.5 and 10 feet bsg. All trenches were excavated to native hard-pan material. No waste was encountered in any of the trenches. A representative of the EHD was onsite and observed all excavation and trenching activities.