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1tvbC.5rrz/nj- Ok( C SECTION VII. CONCLUSIONS Pinnacle Environmental, Inc. (PEI), was retained by Industrial Drive Receivership Estate (Client), to perform a Limited Phase II Environmental Site Assessment (Limited Phase II) of a property at 248 Industrial Avenue, Stockton, California 95206, consisting of 50 borings from which soil vapor, soil matrix, and groundwater samples were collected and analyzed. The RECs identified relevant to this report included the potential for subsurface contamination by volatile organic compounds (VOCs), semi-volatile organics (SVOCs), pesticides (including herbicides), heavy metals and petroleum products associated with previous activities at the Site. The scope of work for this Limited Phase II included a subsurface assessment conducted in accordance with the January 23, 2012,proposal. The scope of work included the sampling and analyses of soil vapor from 26 locations, soil matrix from 50 (including 26 soil vapor, 20 soil, 4 groundwater) boring locations, and groundwater at four locations for VOCs and TPH-carbon chain analysis. In addition, eleven soil samples were analyzed by USEPA Methods 8270 (SVOCs), 8141A (organophosphorous pesticides), 8081 (organochlorine pesticides), 8151A (chlorinated herbicides), and CAM 17 metals. The findings are discussed below for each of the areas evaluated. Septic Tank Area This Limited Phase II has found that concentrations of benzene and 1,2-dichloropropane (Table 9) exist moderately above MCLs in groundwater samples apparently associated with the septic system(GW-1,Figure 3). Therefore, PEI is of the opinion that the septic system(including the leach field) represents a source area requires further investigation. Two UST Graves Two UST graves were detected near the southeast corner of the building during the geophysical survey. Observations made during excavations of two UST graves are that the visual signs of historical impact underlie these graves. However, significant soil impact was not noted in shallow soil samples collected from borings at these two locations (i.e„ SB-104, SB-106 & SB-108, and SV-5 and SV-7) within the building as well as adjacent to it. It is possible that higher concentrations of petroleum hydrocarbons exist at depths below the base of the former USTs. Railroad Railroad Spur The results of laboratory analyses are that moderate concentrations of motor-oil range hydrocarbons (C23-C35) occur along the railroad spur west of the building (Figure 5). Specifically, SV-11, SV-12 and SV-14 noted concentrations between 703 and 2,630 mg/Kg;however, these concentrations were below regulatory standards. Limited Phase II Environmental Site Assessment Report Pinnacle Environmental,Inc. 248 Industrial Avenue,Stockton,CA 95206 Page 25