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Revised Site Assessment Report Former GLOBAL MATERIALS MANAGEMENT 1640 North Broadway Avenue, Stockton, California 1.0. INTRODUCTION At the request of the property owner Mr. William Johns, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Revised Site Assessment Report for the property located at 1640 North Broadway Avenue, Stockton, California (site). The scope of work included excavating/potholing to remove previously identified soil contamination in the location of sample S-1, soil sampling to define the lateral and vertical extent of soil surrounding sample S-1, and the preparation of this report. The site and surrounding area are illustrated in Figure 1; on-site structures and soil excavation/potholing locations are illustrated in Figure 2; and all soil sampling locations are depicted in Figure 3. Excavation and soil sampling procedures were outlined in the AGE -prepared Preliminary Site Assessment Work Plan (Work Plan) dated 30 July 2018 which was approved by San Joaquin County Environmental Health Departments (SJCEHD) email on 13 August 2018 (Appendix A). 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 disposed as non-RCRA hazardous waste. During a site inspection by SJCEHD in January 2018, the gross contamination visually appeared to be removed. However, due to 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 (S-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. With the exception of Pb detected in soil sample S-1, all other metal concentrations were below either the June 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) or the May 2018 Environmental Protection Agency (EPA) Region 9 Regional Screening Levels for industrial soil (RSLs). Additionally, total petroleum hydrocarbons quantified as motor oil (TPH-mo) detected in all four samples were below the San Francisco Bay RWQCB