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PARTNER www.PARTNEResi.com (800)419-4923 I DI September 10, 2024 San Joaquin County Environmental Health Department 1868 Hazelton Avenue Stocken, California 95205 Subject: Geotechnical and Phase II Subsurface Investigation Work Plan CA 2563 Lathrop 101 West Lathrop Road Lathrop, California 95330 Partner Project Numbers 24-459140.3 & .4 To whom this may concern: Partner Engineering and Science, Inc. (Partner), on behalf of Mister Car Wash has prepared this Geotechnical and Phase II Subsurface Investigation Work Plan for the property addressed at 101 West Lathrop Road, Lathrop, California 95330 (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 September 4, 2024, on behalf of CWP California Corp., a Delaware corporation, its affiliates, successors, subsidiaries and assigns. Based on the information reviewed and the site reconnaissance, the subject property consists of a portion of one parcel of land comprising 1.1 acres located on the west side of South Harlan Road, the north side of West Lathrop Road, and the east side of Old Harlan Road within a residential and commercial area of Lathrop, San Joaquin County, California. The subject property is currently vacant land. According to historical sources, the subject property was previously undeveloped as early as 1915, was land associated with a farm from at least 1932 to 1937, and has been vacant land since at least 1949. It appears that the vacant land has been kept graded and cleared since at least 1968. The following recognized environmental condition (REC)was identified in the Phase l: • The eastern adjoining property is a fueling station regulated by the San Joaquin County Environmental Health Department (SJCEHD). Two 10,000-gallon gasoline and two 10,000-gallon diesel underground storage tanks (USTs) were installed at the facility in 1989 and remain active. According to information provided in the regulatory database report and records available on the SJCEHD online database, various UST, hazardous waste, and Hazardous Materials Release Response Plan (HMRRP) inspections have been conducted at the facility between 2013 and 2023. Several violations were recorded during these inspections, all of which are listed as returned to compliance. The adjoining property's USTs and dispensers are located approximately 25 feet from the Parent Parcel boundary and approximately 40 feet from the subject property boundary. While no releases from the USTs, piping, or dispensers have More Than Just Assessments.Solutions.