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07 June 2022 Project No. 14-3154 Page 2 of 6 AdvancedGeo An Employee- Owned Company Based on the preliminary results of the July 2015 investigation, the CVRWQCB and EHD determined that the area of T-29 may have been a disposal area. The current property owner disputes this conclusion, but in order to satisfy agency concerns has agreed to perform the investigation. The goal of the investigation is to determine if buried waste is located in the area of T-29 and to eliminate the area as a suspected disposal area if waste is not encountered. The ultimate goal is to eventually obtain a clean closure and fulfill the requirements of CCR Title 27 Sections 21810, 21090(f), and 21770(a), and Local Enforcement Agency (LEA) Advisory #16 (published by Cal Recycle), to obtain a clean closure for the disposal site. 3.0. BACKGROUND AND SITE INFORMATION The subject property (Parcel A) has a physical address of 500 East Louise Avenue, Lathrop, California, and is located on the south side of East Louise Avenue approximately 400 feet east of the intersection of East Louise Avenue and Harlan Road. The property includes one parcel totaling approximately 59.44 acres (APN: 198-120-120) and is located within an industrial area of the city of Lathrop, San Joaquin County, California. 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 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 disputes the conclusion that the area in the proximity of 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. This work plan proposes a scope of work to only investigate the southwest corner of the parcel in the proximity of T-29. In late 2017, the southwest corner of the subject property,