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PARTNER www.PARTNEResi.com 1 (800)419-4923 I DI May 28, 2026 San Joaquin County Environmental Health Department 1868 East Hazelton Avenue Stocken, California 95205 Subject: Phase II Subsurface Investigation Work Plan 444 Mossdale Road Lathrop, California 95330 Partner Project Number 26-597206.1 Partner Engineering and Science, Inc. (Partner), on behalf of Mr. Surendar Jindal (owner) has prepared this Phase II Subsurface Investigation Work Plan for the property addressed at 444 Mossdale Avenue in Lathrop, California (herein referred to as the "subject property"). Project History Partner was provided with an AEI Consultants (AEI) Phase I Environmental Site Assessment Report (Phase 1) for the subject property, dated April 21, 2026, prepared on behalf of Columbia Bank. Based on the information provided, the subject property consists of one parcel of land comprising 0.83-acre located on the northwest side of Mossdale Road, southeast of Interstate 5, within a mixed residential and commercial area of Lathrop, San Joaquin County, California. The subject property is currently developed with a single- story building and is occupied by a Chevron gasoline station and Extra Mile convenience store. On-site operations consist of retail sale of gasoline and diesel fuel and convenience store items. In addition to the current structure, the subject property is improved with a fuel dispenser canopy, six fueling islands, 12 fuel dispensers,asphalt-paved parking/drive areas,storage trailer,dumpster enclosure,water well, pressure tank and water treatment equipment, pole-mounted sign, stormwater detention pond, and landscaped areas. According to available historical sources reviewed by AEI, "the subject property was identified to consist of unimproved land and/or agricultural land dating back to at least 1915; residential and agricultural from at least 1937 to 1968; and was developed with a gasoline service station from 1972 until 2014. Demolition of the former service station building occurred in 2014/2015, with construction of the existing convenience store building in 2014/2015. The site has operated with the current improvements as a gasoline/diesel fueling station and convenience store since 2015." The following recognized environmental condition (REC)was identified in the AEI Phase I: • "The subject property currently operates as a gas station. AEI's review of historical and regulatory agency records indicated that the subject property contains one (1) 20,000-gallon double-walled steel/fiberglass UST [underground storage tank], which is split into a 10,000-gallon regular unleaded gasoline compartment, 4,000-gallon premium unleaded gasoline compartment and 6,000-gallon diesel fuel compartment.The UST was installed on the southwestern side of the subject property on More Than Just Assessments.Solutions.