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ATTACHMENT C: FIELD INVESTIGATION PROCEDURES AND BORING LOGS DRILLING On February 28, March 5, September 10, September 28, December 10,December 13, and December 14, 2012, SAIC Energy, Environment& Infrastructure (SAIC) observed PeneCore Drilling(C57#906899) advance soil borings SB-1 through SB-9 at the Ahern Road-Vernalis site in Vernalis, California as shown on Figure 2. Borings were advanced to depths ranging from 40 to 85 feet below ground surface (bgs). Geoprobe=type drilling equipment was used to advance the soil borings, and a continuous-coring device was used to collect soil samples for soil characterization only. The completion of soil borings generally conformed to SAIC Field Technical Procedure (FTP)No. 525, "Soil Sampling Using an Auger." The samples were screened using photoionization detection (PID) equipment, using procedures consistent with SAIC FTP No. 750, "Field Measurement Procedures— Organic Vapor Detection,"to detect the presence of residual petroleum in soil. The soil was logged in general accordance to the Unified Soil Classification System (USCS) as presented in American Society for Testing and Materials 2488-90 under the supervision of a California Professional Geologist. Additionally, other information was entered into field logbooks to document where, when, how, and from whom any vital project information was obtained, using procedures described in SAIC FTP No. 1215, "Use of Field Logbooks." Soil borings were logged in accordance with the USCS. Soil samples were screened visually for evidence of crude oil and were also screened using a PID to measure organic hydrocarbon vapors. Soil and groundwater samples were submitted to Eurofins Lancaster Laboratories, Inc. (Lancaster; California State-certified laboratory, Environmental Laboratory Accreditation Program License Number 2116) under SAIC chain-of-custody protocol. Following completion of the soil borings, each open borehole was plugged and abandoned according to San Joaquin County Environmental Health Department requirements. SOIL SAMPLING Soil cores were obtained using a core barrel sampler approximately 5 feet long and 2 inches in diameter. The core barrel sampler contained a plastic acetate liner that retained a relatively undisturbed soil core from which samples were collected. The soil samples selected for analysis were cut from the plastic liners, sealed with plastic end caps and Teflon tape, labeled with identifying information, and stored in a pre-chilled ice chest for transportation to Lancaster. A chain-of-custody form designating the samples to be analyzed and other information accompanied the samples to the laboratory. One soil sample was collected from each boring between ground surface and 10 feet bgs to obtain a sample for a human health screening evaluation (HHSE). If affected soil was observed in the boring, a soil sample was collected from the interval that appeared to be the most affected. If there appeared to be an interval of unaffected soil beneath the