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j Preliminary Site Investigation Work Plan Former GLOBAL MATERIALS MANAGEMENT 1640 Broadway Avenue, Stockton, San Joaquin County, California 1.0. INTRODUCTION At the request of the property owner Mr. William Johns, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Preliminary Site Investigation Work Plan (Plan) for the property located at 1640 Broadway Avenue, Stockton, California (site). A site map depicting site features, approximate locations of previous soil excavation areas, soil sample locations, and proposed soil trenching (excavation) locations is presented in Figure 1. The property is a 0.94-acre rectangular parcel with two main structures on the western edge of the site. The area of concern is in the south-central area of the site. 2.0. BACKGROUND Global Materials Management (GMM) was a used oil filter recycling business. Gross contamination was visually observed on the property in the area utilized for waste oil recovery and crushing and storing of used oil filters prior to recycling. Approximately 70 yards of contaminated soil was excavated and removed from the eastern portion of the site in 2017. The soil was transported and disposal as non-RCRA hazardous waste. During a site inspection by SJCEHD in January 2018, the gross contamination visually appeared to be removed. However, because of previous contamination noted on the property, four shallow soil samples were collected during the site inspection to evaluate and confirm remediation/removal of the soil contamination (S-1 through S-4). All four soil samples exhibited residual contamination. An elevated level of total lead (Pb) was detected in one soil sample (ID-1) at a concentration of 450 milligrams per kilogram (mg/kg). Soluble Threshold Limit Concentration (STLC) analysis of sample S-1 detected Pb at a concentration of 45.9 milligrams per liter (mg/1), which exceeds the hazardous waste characterization threshold. Except for the Pb concentration detected in S-1, all other metal concentrations were below the January 2018 Human and Ecological Risk Office (HERO), Human Health Risk Assessment (HHRA)-Note 3 screening levels for commercial properties, published by the California Department of Toxic Substance Control (DTSC-SLs) and the November 2017 Environmental Protection Agency (EPA) Region 9 Regional Screening Levels for industrial soil (RSLs). Additionally, TPH-oil detected in all four samples was below the San Francisco Bay RWQCB Environmental Screening Level for commercial properties. Analytical results of soil sample and screening level values are summarized in Table 1; a copy of the analytical lab report is included in Appendix A. Based on the results of the soil sample analysis, the San Joaquin County Environmental Health Department (SJCEHD) prepared a Waste Discharge/Spill Response Notice to Abate letter dated 20 March 2018 (Appendix A). The letter directs investigation and