ARCHIVED REPORTS PHASE II ENVIRONMENTAL SITE ASSESSMENT REPORT

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L L PHASE H ENVIRONMENTAL SITE ASSESSMENT REPORT L 1025 EAST MAIN STREET STOCKTON, SAN JOAQUIN COUNTY, CALIFORNIA LEXECUTIVE SUMMARY Condor Earth Technologies, Inc. (Condor) conducted a Phase Il Environmental Site Assessment (ESA) L for the property located at 1025 East Main Street located in downtown Stockton, San Joaquin County, California (Figures 1 and 2, Appendix A). The evaluated properties include three parcels designated as Assessor Parcel Numbers (APNs) 151-201-02, 151-201-03, and 151-201-06 (Site),totaling 1.9 acres. The purpose of the work was to further investigate the Recognized Environmental Conditions (RECs) identified in the Phase I ESA report, dated November 5, 2007, prepared by Condor. The Phase 11 ESA comprises a screening of site soils for the presence of petroleum hydrocarbons, arsenic,and lead from the former railroads and spur lines; a screening of Site soils around the perimeter of the depot for Lorganochlorine pesticides and lead; and a screening of groundwater for petroleum hydrocarbons, semi- volatile organic compounds (SVOCs), and volatile organic compounds (VOCs)beneath the Site. Condor conducted this work under contract with the San Joaquin Regional Rail Commission (Client). The Site has historically been used as a train depot from the early 1900s to the 1970s and was evaluated by different sampling schemes. Each sampling scheme was designed to screen for possible contamination in particular areas based on past uses of that area. ` Metals The arsenic concentrations in the soil samples collected from the western portion of the Site range from i 5.1 to 17 milligrams per kilogram (mg/kg), and are representative of background arsenic concentrations L in Stockton. Arsenic concentrations in the eastern portion of the Site (former Western Pacific Railroad) range from 10 to 40 mg/kg, and appear to be slightly elevated above background arsenic concentrations. L Lead concentrations in the twelve samples collected from the former rail use areas ranged from 24 to 370 mg/kg with an average of 134 mg/kg. Elevated lead concentrations were detected in surface soil samples primarily around the perimeter of the train depot,with concentrations ranging from 32 to 840 mg/kg with L an average of 240 mg/kg. Of the 10 soil samples collected from the depot perimeter, one of the samples exceeded the U.S. Environmental Protection Agency (EPA) Region 9 Preliminary Remediation Goal (PRG)of 800 mg/kg lead for commercial land use types: DS-0, 840 mg/kg lead. LOrganochlorine Pesticides(OCPs) Of the OCPs analyzed, chlordane was detected in two of the surface samples collected from the L southwestern and southern walls of the depot at 1.3 and 1.0 mg/kg. These concentrations are less than the California EPA, California Human Health Screening Level(CHHSL)of 1.7 mg/kg.. L VOCs and SVOCs Of the VOCs analyzed, chloroform was detected in all of the groundwater samples at 0.90, 3.4, 5.5, and 7.7 micrograms per liter (µg/L). These concentrations of chloroform are well below the Cal EPA Maximum Contaminant Level (MCL) of 80 µg/L. The remaining SVOCs and VOCs analyzed were not detected at or above laboratory reporting limits in groundwater samples. Benzene,Toluene, Ethylbenzene, Total Xylenes (BTEX); and Petroleum Hydrocarbons L BTEX compounds were not detected at or above the reporting limits of 0.005 mg/kg in any of the soil samples analyzed for these constituents. Total petroleum hydrocarbons (TPH) quantified as gasoline L (TPH-G) was detected in one sample at 3.2 mg/kg (RS 4-3) collected from the rail spur area (western Li"A CONDOR