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` KLE/NF-EL... c.;nf s:oNf. Based on previous geotechnical studies at Dameron, Kleinfelder expects groundwater to be approximately 20 feet bgs which is below to proposed exploration depth of 16 feet bgs. PERMITTING AND PRE-FIELD ACTIVITIES Kleinfelder submitted a work plan, health and safety plan and boring permit application packet to the San Joaquin County Environmental Health Department (SJC/EHD). The work plan was titled "Work Plan, Underground Storage Tank Soil Evaluation, Dameron Hospital, 525 W. Acacia Street, Stockton, California (File No. 124508.1/ST011P171, dated December 28, 2011). An approved boring permit was obtained prior to initiating the field activities. The site was marked for utilities, and Underground Services Alert was contacted at least 48 hours prior to field activities. For a copy of the boring permits, please refer to Attachment D. FIELD ACTIVITIES On January 6, 2012, Kleinfelder performed a limited soil assessment at the site. Advancement of four push probes was conducted by a pushprobe (Geoprobe) contractor, V&W Drilling of Stockton, California (V&W). V&W advanced four probes, two near the fill end (P-1 and P-2), one on the opposing west end (P-4), and one near the middle area of the UST (P-3). Approximate probe locations are depicted on attached Plate 2. Each of the probes was advanced to a maximum depth of 16 feet bgs. Groundwater was not observed during the probing operations. Prior to the mechanical advancement of the pushprobes, the first 5 feet at each probe were hand-augered to assess potential underground utilities. After hand augering, the push probes were pneumatically advanced using a 4-foot steel core barrel. During advancement of the push probes, soil samples were continuously collected for logging purposes, field screening, and potential chemical analysis. Soil samples were collected by inserting a new 4-foot acetate liner into the core barrel prior to each drive. Soil samples obtained for potential chemical analysis were collected at desired intervals (approximately 7, 12, and 16 feet bgs), by removing the acetate liner and cutting out the desired 6-inch interval. The acetate soil sample containers were then removed from the boring and sealed with Teflon° sheeting and tight-fitting plastic end caps. The soil samples collected were field screened using a photo-ionization detector (PID) as described in Attachment B, Section B-2.3. PID readings were recorded on the boring logs located in Attachment A. PID readings were found to be negative (0 ppmv). No obvious petroleum odor or discoloration was noted from the soil cuttings or samples collected in the four probes. 124508.T3/ST012R0251 Page 2 of 6 February 20, 2012 Copyright 2012 Kleinfelder