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1 iCL E/NFEL'OER Bright People.Right Solutions. PROPOSED SERVICES This following scope of work includes permitting, field work, laboratory analyses, and reporting based upon our understanding of current Site conditions and information provided to Kleinfelder from Dameron. Task 1 — Permitting and Pre-Field Activities San Joaquin Environmental Health Department (EHD) requires completion of a boring/probe permit for the Site, and payment of fees prior to advancement of the probes. Kleinfelder will prepare boring/probe permit applications for submittal to EHD along with the required fees and a work plan detailing the proposed work. The permits must be approved prior to field activities and sampling. EHD usually requires up to two weeks to issue the permits. The pushprobe subcontractor and/or Kleinfelder will contact Underground Service Alert (USA) 48 hours prior to conducting fieldwork to notify various utilities of our proposed subsurface assessment. Kleinfelder will prepare a health and safety plan prior to the actual field assessment. Task 2 —Advancement of Pushprobes/Laboratory Analyses The purpose of the pushprobe assessment will be to evaluate diesel fuel constituents in soil near each end and along the sides of the UST. Kleinfelder estimates the inverted depth (or bottom) of the UST to be approximately 11 feet below ground surface (bgs) (estimated 3 feet of cover and tank diameter of 8 feet) and that potential leaks would probably be most evident at depths just below the inverted depth. The soil near the UST fill point is also a likely spill area and one in which regulators require sampling from during tank closure. Based on this information, Kleinfelder proposes the advancement of up to four probes, three near the UST ends (two near the fill end and one on the opposing end) and one near the middle area of the UST (Plate 1). The actual pushprobe locations will be dependent on access, surface conditions, and potential interference with subsurface and above-ground utilities. Based on previous geotechnical studies at Dameron, Kleinfelder expects groundwater to be approximately 20 feet bgs; therefore we do not anticipate encountering groundwater at the proposed total assessment depth of 16 feet. Prior to the advancement of the pushprobes, the first four feet will be hand-augered to assess potential underground utilities. Pushprobes will be advanced using a pneumatically driven steel probe. Soil samples will be obtained by inserting a sample barrel, lined with acetate liners, into the ground. The sample barrel will be lowered to the desired sampling interval and driven into the soil. The sample liners will be removed and the selected sampling interval will be sealed with Teflon sheets and plastic end caps. 124508.1/STO11 P171 Page 2 of 6 December 28, 2011 Copyright 2011 Kleinfelder