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PARTNER www.PARTNEResi.com (800)419-4923 August 23, 2023 San Joaquin County Environmental Health Department 1868 Hazelton Avenue Stocken, California 95205 Subject: Phase II Subsurface Investigation Work Plan 9500 West Linne Road Tracy, California 95377 Partner Project Number 23-414420.2 To whom this may concern: Partner Engineering and Science, Inc. (Partner) has prepared this Phase II Subsurface Investigation Work Plan for the property addressed at 9500 West Linne Road in Tracy, California (herein referred to as the "subject property"). Project History Partner completed a Phase 1 Environmental Site Assessment Report(Phase 1) for the subject property, dated August 2, 2023, on behalf of Copart. Based on the information reviewed and the site reconnaissance, the subject property consists of one parcel of land comprising 115.53 acres located on the south side of West Linne Road and the west side of South MacArthur Drive within a residential, commercial, industrial, and agricultural area of Tracy, San Joaquin County, California.The subject property is currently vacant land. Due to the vacant nature of the property, no operations are currently conducted on site. Although the subject property is vacant of structures, it is improved with a potable water well, pad-mounted transformers, and a drainage pond. According to available historical sources,the subject property was formerly developed with an asphalt plant as early as 1937 until 1993. The subject property has been vacant land since 1993. The following recognized environmental condition (REC) was identified in the Phase I: • The subject property was historically used as an asphalt plant from the 1930s through 1993. In the early 2000s, Teichert began operations to clean up the subject property in the area of the former asphalt plant. During the cleanup operations, six underground storage tanks (USTs) were identified. Diesel-contaminated water was identified within the USTs. It was concluded that the water could be filtered and reused during cleaning operations. The six USTs were then removed. Sampling of the tank pit post-removal indicated the presence of oil and diesel-range petroleum hydrocarbon contamination in the soil. Soil excavation was used as the primary remediation method for the contaminated soil. During the process, approximately 80,000 cubic yards of contaminated soil was excavated. Petroleum hydrocarbon impacts were also noted at the water table.Approximately 30,000 cubic yards of clean stockpiled soil was used to backfill the excavated areas, with the remainder More Than Just Assessments.Solutions.