ARCHIVED REPORTS_2019 SOIL MGMT PLAN (JULY-REVISED)

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WU1 Clean Closure Plan and Work Plan Addendum (Excavation and Material Management Plan) FORMER PILKINGTON NORTH AMERICA – LATHROP FACILITY 500 East Louise Avenue, Lathrop, San Joaquin County, California Parcel 198-120-08 (Parcel A) of Disposal Site: SWIS Number 39-CR-0022 1.0. INTRODUCTION At the request of Mr. Dana Parry of R & B Louise LLC, et al, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Clean Closure Plan and Work Plan Addendum (Plan) for the portion of Waste Unit 1 (WU1) situated on the far southwesterly portion of the property located at 500 East Louise Avenue, Lathrop, California (herein referred to as “subject property”; Parcel Number 198-120-08 or Parcel A). This Plan was prepared in accordance with San Joaquin County Environmental Health Department (EHD) letter dated 22 January 2019 (Appendix A) to obtain clean closure for WU1 on Parcel A of Disposal Site Solid Waste Information System (SWIS ) 39-CR-0022. An approved closure plan is necessary before a request can be made for final closure [Title 27 of the California Code of Regulations; 27 CCR 21099 (b)]. Additionally, this Plan was prepared as a work plan addendum to the Excavation and Materials Management Plan (EMMP) dated 09 March 2018 prepared by Brusca Associates, Inc. (BAI); the EMMP is included in Appendix B. The EMMP was amended by an addendum dated 22 March 2018 prepared by BAI. The EMMP was developed to excavate, remove, and manage solid waste materials and soil located in disposal area WU1 on Parcel B (17100 Murphy Parkway, Parcel Number 198-120-09, a portion of SWIS 39-CR-0022) directly southerly of the subject Parcel A. The EMMP was approved by the EHD and the Central Valley Regional Water Quality Control Board (Regional Water Board). The work described in the EMMP and addendum was performed in April 2018. During field activities it was discovered that a small elliptical portion of WU1 extended to the north onto Parcel A. The EMMP scope of work on Parcel B was completed in July 2018 and a verification report was submitted in December 2018. Based on discussions with EHD staff on 17 and 28 December 2018, it was determined that there are two suspected disposal areas on 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 WU1 has been identified to extend onto Parcel A. This Plan addresses only the latter area (2) on Parcel A where WU1 has been identified. Extensive background information on the former Pilkington North America, Inc. Lathrop Facility Parcels A and B (the “Former PNA Facility”) and detailed information about WU1 were provided in the AGE-prepared: 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. The location of the Former PNA Facility is illustrated in Figure 1. The layout of the entire Parcel A, the area of capped waste (WU1) removed from Parcel B and the small area of