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March 5, 2024 San Joaquin County Environmental Health Department 1868 Hazelton Avenue Stockton, California 95205 Subject: Phase II Subsurface Investigation Work Plan 10304 West Linne Road Tracy, California 95377 Partner Project Number 23-433299.2 To whom it may concern: Partner Engineering and Science, Inc. (Partner) has prepared this Phase II Subsurface Investigation Work Plan for the property addressed at 10304 West Linne Road in Tracy, California (herein referred to as the "subject property"). Project History Partner completed a Phase I Environmental Site Assessment Report(Phase 1) for the subject property, dated February 20, 2024, on behalf of Copart. Based on the information reviewed and the site reconnaissance,the subject property consists of one parcel of land comprising 32.92 acres located on the south side of West Linne Road within a commercial and industrial area of Tracy, San Joaquin County, California. The subject property is currently developed with three buildings totaling 7,108 square feet and is currently vacant. In addition to the current structures, the subject property is improved with asphalt-paved parking areas, drainage features, sheds, perimeter fencing, metal canopies, and temporary structures. According to available historical sources, the subject property was formerly undeveloped as early as 1916; developed as part of gravel pit from circa 1974 to circa 1982; and developed with the current structures circa 1989. The following recognized environmental condition (REC) was identified in the Phase 1: The subject property is equipped with two on-site septic systems located in the south portion of the property. The septic systems were presumably installed circa 1992 and updated in 2013. The subject property has been utilized for industrial purposes since construction in 1989.The on-site septic systems act as a direct conduit to the subsurface of the subject property for any materials discharged as a result of the on-site industrial operations. The subject property has been occupied by various industrial concrete manufacturers,the last tenant Oldcast Precast vacated the subject property in 2022 and since then the property has been vacant. The potential exists for the industrial operations to impact the subsurface of the subject property via the septic systems. The industrial use coupled with the presence of the septic systems is considered a REC. Based on available information from the State Water Resources Control Board (SWRCB) Geotracker website for a Leaking Underground Storage Tank site (facility identification number T0607700371) located approximately 1 mile to the south of the subject property, groundwater is anticipated to be first encountered at approximately 120 to 127 feet below ground surface (bgs) with flow direction to the northeast. The subsurface is expected to consist of silty sand with gravel to at least 20 feet bgs.