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AdvancedGeo Environmental 13 June 2018 AGE Project No. 18-4433 Mr. [or Xiong San Joaquin County Environmental Health 1868 E. HazeIton Avenue Stockton, California 95205 Subject: Phase ll Site Assessment Work Plan LEE PROPERTIES — HUNTER STREET 540 N Hunter Street & 235 E Fremont Street, Stockton, California Dear Mr. Xiong: Advanced GeoEnvironmental, Inc. (AGE) has prepared this Phase II Site Assessment Work Plan for the properties located at 540 North Hunter Street and 235 East Fremont Street, Stockton, California (site). The work plan provides procedures for the collection of soil, soil-vapor, and groundwater samples at the site. The site and surrounding area are illustrated in Figure 1; on-site structures and proposed soil boring locations are illustrated in Figure 2. INTRODUCTION AND BACKGROUND During the performance of a Phase I Environmental Site Assessment for the site, AGE identified three former USTs located on the northeast exterior side of the property building and two former USTs located on the southwest exterior corner of the property building. AGE also identified the presence of an in-ground clarifier located along the east side of the interior warehouse building. Additionally, an unassessed gasoline fueling station was identified to the immediate south located at 502 North Hunter Street and two historical unassessed dry-cleaning facilities were identified to the west and south, respectively, located at addresses 519 North Hunter Street and 224 East Fremont Street. To evaluate if the existing in-ground clarifier, former USTs, or if the off-site gasoline fueling station and historical dry-cleaning facilities have impacted the subsurface beneath the subject property, AGE has recommended soil, soil-vapor and groundwater samples to be collected. Procedures sample collection are described in detail below. , g, 837 Shaw Road • Stockton, CA 95215 Telephone (800) 511-9300 • Fax (888) 445-8786 An Employee-Owned Company