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1 <br /> APPENDIX C: <br /> FIELD AND SAMPLING METHODS <br /> C.1 DRILLING <br /> SAIC Energy, Environment& Infrastructure, LLC (SAIC)observed Penecore Drilling advance <br /> 48 soil borings(MB-38 through MB-85) on April 26 through 29,2010,using a hand auger, to <br /> total depths ranging from 6.5 to 10.3 feet below ground surface(bgs). On October 5, 2010, an <br /> additional six soil samples (MB-86 through MB-91)were collected during excavation activities <br /> from the base and sidewalls of the excavation. <br /> The completion of soil borings generally conformed to SAIC Field Technical Procedure(FTP) <br /> No. 525,"Soil Sampling Using an Auger." In accordance with the approach prescribed in the <br /> Consistent Technical Approach', and to the extent practicable, SAIC attempted to collect soil <br /> samples from the target depth. <br /> The samples were screened with photo-ionization detection equipment,using procedures <br /> consistent with SAIC FTP No. 750, "Field Measurement Procedures—Organic Vapor <br /> Detection,"to detect the presence of residual petroleum in soil. The soil was logged in general <br /> accordance to the Unified Soil Classification System as presented in American Society for <br /> Testing and Materials(ASTM) 2488-90 under the supervision of a California Professional <br /> Geologist. Additionally, other information was entered into field logbooks to document where, <br /> when,how, and from whom any vital project information was obtained,using procedures <br /> described in SAIC FTP No. 1215, "Use of Field Logbooks." <br /> ' Following completion of the soil borings, each open borehole was plugged and abandoned <br /> according to San Joaquin County Environmental Health Department requirements. <br /> C.2 SOIL SAMPLING <br /> Select soil samples were collected into United States Environmental Protection Agency <br /> (EPA)-approved containers and submitted to a California-certified laboratory(Calscience <br /> Environmental Laboratories, Inc. [Calscience]) under SAIC chain-of-custody protocol and <br /> analyzed for the constituents of potential concern(COPCs). <br /> C.3 SAMPLING LOCATIONS/SURVEY METHODS <br /> Soil borings were geo-spatially located using a global positioning system (GPS)unit. The GPS <br /> survey methods were consistent with SAIC FTP No. 175, "Field Measurement of Physical and <br /> ' Topographical Features." <br /> CA EQUIPMENT DECONTAMINATION <br /> The decontamination of sampling equipment, which did not directly contact the samples, was <br /> performed in accordance with SAIC FTP No. 400,"Equipment Decontamination." Sample <br /> collection devices, which directly contacted the samples, were decontaminated in accordance <br /> with SAIC FTP No. 405, "Cleaning and Decontaminating Sample Containers and Sampling <br /> Equipment." <br /> t_ Geomatrix Consultants,Inc.,2005. Second Draft Revised Technical Approach to Site Evaluaiion and Decision Making,Old <br /> Valley Pipeline Sites. Update. <br /> ' C-1 <br /> SAIE <br />