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<br /> <br /> <br />837 Shaw Road • Stockton, CA 95215 <br />Telephone (800) 511-9300 • Fax (888) 445-8786 <br /> <br />07 December 2020 <br />Project No. 20-6249 <br /> <br /> <br />Mr. Michael Kith <br />San Joaquin County Environmental Health Department <br />1868 E. Hazelton Avenue <br />Stockton, CA 95205 <br />Via Email: mkith@sjgov.org <br /> <br />Subject: Limited Phase II Site Assessment Work Plan <br /> VIA DEL ORO PROPERTY <br /> 1444 Tillie Lewis Drive, Stockton, California <br /> <br /> <br />Dear Mr. Kith: <br /> <br />AdvancedGeo, Inc. (AGI) has prepared this Limited Phase II Site Assessment Work Plan <br />for the property located at 1444 Tillie Lewis Drive, Stockton, California (site or subject <br />property). The scope of work includes advancing six (6) soil borings for the collection of <br />soil, soil-vapor, and groundwater samples. <br /> <br />This work plan has been prepared as required by the San Joaquin County Environmental <br />Health Department (EHD) application for a boring/well permit. The site and surrounding <br />area are illustrated in Figure 1. On-site structures, previous soil-vapor sampling locations, <br />and proposed soil boring locations are illustrated in Figure 2. <br /> <br /> <br />1.0. INTRODUCTION AND BACKGROUND <br /> <br />In June 1990, one 4,000-gallon xylene underground storage tank (UST) was removed <br />from the property. Elevated concentrations of xylenes were detected in the soil samples <br />collected beneath the tank. Approximately 750 cubic yards of soil were over-excavated <br />from the tank pit and six groundwater monitoring wells were installed on the property <br />(MW1 through MW6) in late 1990. Periodic groundwater monitoring and sampling events <br />indicated a groundwater flow direction to the southeast and minor dissolved petroleum <br />hydrocarbon impact. Between 1990 and 1995, petroleum hydrocarbon concentrations <br />significantly decreased over time and only minor levels of contamination were found in <br />soil. A closure letter was issued to the subject property in April 1996. <br /> <br />In October 2000, six (6) soil borings were advanced at the site as part of a due diligence <br />investigation. Soil and groundwater samples were collected from selected borings but <br />were not submitted for analysis. Field observations indicated potential petroleum