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West Weber SSI Report 1404-1541 West Weber Avenue Stockton,California Date:May 22,2013 Notes: pg/L- micrograms per liter mg/L- milligrams per liter J - estimated concentration NA- not analyzed NS - no standard available U - analyte not detected UJ -analyte not detected; reporting detection limit may be inaccurate or imprecise bold -analyte detected bold and shaded -analyte conentration exceeds the California Maximum Contaminant Level 'MCLs, DLRs, and PHGs for Regulated Drinking Water Contaminants, January 30, 2013 (http://www.cdph.ca.gov/certlic/drinkingwater/Pages/MCLsandPHGs.aspx) 4.4 Northern Parcels 16 and 17: Site Assessment Summary 4.4.1 Soil Boring Advancement and Soil Sampling On April 16 through 19,2013, with GEI supervision, Gregg advanced 23 borings in the northern two parcels, and 27 soil samples were collected from these locations for laboratory analysis. All borings are shown on Figure 2. Ten borings were named northern parcel southern boundary soil borings (NDSB-1 through NPSB-5, each with a step-out named NPSB-1 S through NPSB-5S)and were advanced to a depth of 3 feet using a Geoprobe drill rig. The NPSB soil boring locations were chosen to correspond with shallow arsenic soil boring results that were presented in the PEA. Borings NPSB-2 and NPSB-3 were analyzed for lead. Two borings B-GW 1 and B-GW2 correspond to former tank sites TKI and TK2, respectively. In addition,three step-out borings B-GW 1 S 1, B-GW 1 S2, B-GW 1 S3, 13- GW2S 1, B-GW2S2, and B-GW2S3 were advanced to the north,west and east of each of the former tank site borings,for a total of eight borings around the former tank locations. Five additional borings were advanced on the north parcel NP13-7,NPB-7S,NP13-8, and NPB-8S for soil arsenic and NPSB-9 for soil lead and arsenic and corresponded with sample locations from the PEA. The boring and sample depths along with the analyses performed are presented in Table 4. GEI Consultants, Inc. 18