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BndgeStone/F-westone, Inc. 400 N. EI Dorado, Stockton, CaUorma <br /> February 2, 1994 Site Assessment Report—RMI 207201 Page 6 of 12 <br /> 3.6 Soil Sample Collection <br /> All soil samples were collected using a California-modified, brass-lined, split-spoon <br /> ' drive tube sampling device Samples were collected from each 5-foot soil interval <br /> Samples were selected for laboratory analysis based on the areas of the highest <br /> PID readings to quantify the degree of hydrocarbon impact Samples were also <br /> ' collected from the borehole termination depths in an attempt to define the vertical <br /> limits of contamination <br /> ' Upon split-spoon retrieval and disassembly, the center brass sleeve was recovered <br /> from within the split-spoon device Both ends of the brass sleeve were immediately <br /> covered with sheets of aluminum foil, secured with plastic caps, and labeled The <br /> ' samples were then stored in a cooler on ice until sample selection for laboratory <br /> analysis was made <br /> Each sample selected for laboratory analysis was placed to a Ziploc bag Ice was <br /> ' distributed within the cooler to maintain EPA-designated sample preservation <br /> temperatures during shipping Chain-of-custody documentation was completed and <br /> transported within the cooler The cooler was secured with packing tape and chain- <br /> of-custody seals and shipped overnight to the contracted laboratory, Analytical <br /> Technologies, Inc , in Fort Collins, Colorado The Analytical Technologies California <br /> Department of Health Services certification number is 1402 <br /> 37 Vapor Extraction Well Installation <br /> ' Based on observed soil conditionsm - <br /> � edium dense to dense, medium-grain sand at <br /> 20-feet), contaminant volatility, depth of contamination (25-feet), and the <br /> structural constraints at the site, a vapor extraction system continues to be an <br /> applicable remediation technology for this site <br />' As a result, one 4-inch soil vapor extraction well and one 2-inch observation well <br /> were installed Due to the limited extent of soil contamination beyond the UST <br /> removal excavation, the 4-inch vapor extraction well was installed in SB-3 through <br />' the center of the pit based largely on field screening and physical observations The <br /> 2-inch observation well was installed in SB-5, inside of the building, as a potential <br /> monitoring point. Installation of these two wells was made in consultation with the <br />' Ryan-Murphy Director of Technical Services. <br /> Soil boring annular space was filled with #2112 silica sand along the screened <br /> interval, a hydrated bentonite pellet plug above the sand, and portland <br /> cement/bentonite grout slurry to the surface The extraction well was completed <br />' RYAN-MURPHY, INCORPORA IFA Denver <br /> FATk'onmened CoEStsuctim Mamagemew I.as Ang <br />