ARCHIVED REPORTS PHASE II ENVIRONMENTAL SITE ASSESSMENT REPORT

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LPhase II Environmental Site Assessment Report-Executive Summary 1025 East Main Street,Stockton,San Joaquin County,Califomia LPagel l 5.3 DISCUSSION OF GROUNDWATER RESULTS Elevated concentrations of motor oil and diesel are present in the groundwater beneath the southern ` portion of the Site. A Condor representative conducted an additional reconnaissance to the area on December 26, 2007 to look for visual evidence of off-site USTs or potential areas of offsite contamination which may be affecting the groundwater beneath the Site. The southern adjoining property L (APN 151-202-06) owner, Stanley Peerson, was interviewed. He purchased the property three years ago and indicated that he was not aware of any USTs on the Site. He stated that the building was constructed in 1897 and was formerly used as a Malt O' Meal cereal processing plant. The Phase I ESA revealed that this property was formerly the location of an agricultural implements manufacturer from at least 1906 L until 1960. From at least 1965 until 1975 it was used intermittently for furniture retail businesses. From at least 1984 until the early 1990s it was used by a cereal products manufacturer. i. The lot east of the former processing plant, APN 151-202-03, is owned by Victor Rosasco and is primarily used for equipment storage; black pipe is currently stored there. There is no property owner listed for APN 151-202-09, west of the building, but there is no evidence of other buildings having been located there in the past.There appeared to be no visual evidence of USTs on these properties. L 6.0 CONCLUSIONS AND RECOMMENDATIONS Condor conducted a Phase Il ESA for the property located at 1025 East Main Street (Site) in Stockton, San Joaquin County, California. 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 6. screen for possible contamination in particular areas based on past uses of that area. Metals 62 The arsenic concentrations in the soil samples collected from the western portion of the Site range from 5.1 to 17 milligrams per kilogram (mg/kg), and are representative of background arsenic concentrations j in Stockton. Arsenic concentrations in the eastern portion of the Site (former Western Pacific Railroad) L range from 10 to 40 mg/kg, and appear to be slightly elevated above background arsenic concentrations. 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 an average of 240 mg/kg. Of the 10 soil samples collected from the depot perimeter, one of the samples exceeded the PRG of 800 mg/kg lead for commercial land use types: DS-0, 840 mg/kg lead. tr OCPs LOf the OCPs analyzed, chlordane was detected in two of the surface samples collected from the southwestern and southern walls of the depot at 1.3 and 1.0 mg/kg. These concentrations are less than the LCHHSL of 1.7 mg/kg for commercial land use. VOCs and SVOCs Of the VOCs analyzed, chloroform was detected in all of the groundwater samples at 0.90, 3.4, 5.5, and L7.7 µg/L. These concentrations of chloroform are well below the California MCL of 80 µg/L. The remaining SVOCs and VOCs analyzed were not detected at or above laboratory reporting limits in groundwater samples. 1 L w i� CONDOR 6