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PARTNER Englneering and Science,Inc. September 25, 2017 San Joaquin County Environmental Health Department(SJCEHD) 1868 Hazelton Avenue Stockton, California 95205-6232 Subject: Work Plan for Additional Phase U Subsurface Investigation 434 Dr. Martin Luther King Jr. Boulevard Stockton, California 95206 Partner Proposal Number P17-191672.4 Partner Engineering and Science,Inc.(Partner)is pleased to submit this work plan to perform environmental investigation activities at the above-referenced property. Project History Partner completed a Phase I Environmental Site Assessment (Phase I) Report, dated August 11, 2017, prepared on behalf of Tailwind Commercial. Based on the information reviewed and the site reconnaissance, the subject property consists of one parcel of land comprising 0.482 acre located on the southwest corner of the Dr. Martin Luther King Jr.Boulevard and California Street intersection within a mixed residential and commercial area of San Joaquin County, California. The subject property is currently developed with one commercial building, which is currently vacant and was most recently occupied by Payless ShoeSource. In addition to the structure, the subject property is improved with concrete-paved parking areas and associated landscaping. According to historical sources,the subject property appears to have been occupied by two generations of gasoline service stations. The first gasoline service station was identified at the historical subject property address of 1401 California Street from at least 1935 until at least 1946. The 1940 aerial photograph depicts a structure within the northeastern corner of the subject property which appears typical of a gasoline service station. The second generation gasoline service station occupied the subject from at least 1968 until circa 1983. To date, no information pertinent to the status and operation of an underground storage tank (UST) system and/or the removal of USTs was identified on file with the State or local regulatory agencies. Additionally, no documentation was available indicating whether soil samples have been collected and analyzed for the presence of petroleum hydrocarbons, as this was not a common practice at the time the gasoline service stations were decommissioned. Based on the absence of documentation related to UST closure and removal,and the absence of previous subsurface investigations that could confirm the presence or absence of a release of petroleum hydrocarbons from the former gasoline service station operations on the subject property, the presence of the former gasoline service station and presumed storage of petroleum hydrocarbons in USTs was considered a recognized environmental condition (REQ. On September 7,2017,Partner performed a limited Phase II Subsurface Investigation(Phase II)at the subject property on behalf of another client to identify the potential location of on-site USTs, former tankholds, and/or other associated features and to investigate the potential impact of petroleum hydrocarbons and fuel-related volatile organic compounds (VOCs) to soil and/or groundwater as a consequence of a release or releases from the historical on-site gasoline service stations. The scope of the Phase II included a 1017 22nd Avenue,Suite 107,Oakland,CA 94606 0 Phone 510-323-4499 0 Fax 510-439-2659