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Site Investigation Work Plan — Trench 29 Area FORMER PILKINGTON NORTH AMERICA — LATHROP FACILITY 500 East Louise Avenue, Lathrop, California 1.0. INTRODUCTION 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 Site Investigation Work Plan — Trench 29 Area for the property located at 500 East Louise Avenue, Lathrop, California (herein referred to as subject property, site, or Parcel A). The proposed scope of work includes the advancement of fifteen (15) soil borings to determine whether buried wastes are present in the location of T-29, and to identify and define the waste if necessary. Based on previous investigations and site history, the current property owner and AGI question whether there is adequate data or information to suspect the presence of buried wastes or waste pits in the location of T-29. The area at and surrounding T-29, has been surfaced with asphalt and developed into a parking lot. Based on the industrial use of the property and the surface cap at T-29, it would appear the work is being directed out of an abundance of caution. However, the property owner is willing to perform the investigation to satisfy the concerns of the Central Valley Regional Water Quality Control Board (CVRWQCB) and the San Joaquin County Environmental Health Department (EHD). This work plan was prepared in accordance with a directive issued by Central Valley Regional Water Quality Control Board (CVRWQCB) letter dated 15 March 2019 (Appendix A). The location of the site is illustrated in Figure 1; on-site structures and parcel boundaries are depicted in Figure 2; proposed soil boring locations and the T-29 area are illustrated in Figure 3; and historical trench locations are depicted in Figure 4. An Investigation Trenching Log summarizing details and information from the trenching investigation is provided in Appendix B. Extensive background information on the former Pilkington North America, Inc. Lathrop Facility Parcels A and B (Former PNA Facility) were provided in the Clean Closure Plan dated 20 June 2018, Site Assessment Summary Report — Final dated 21 June 2018, and Addendum to the Request for Exemption to Implement Construction Controls dated 12 July 2018. 2.0. OBJECTIVES AND PURPOSE The scope of work included in this work plan is intended to determine whether any buried wastes or glass waste cells are located in the proximity of Trench T-29. During excavation of Trench T-29 in July 2015, small pieces of steel, wire, broken concrete, and minor glass were observed between 2 and 3 feet below surface grade (bsg). Native soil was observed above and below the debris in T-29.