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05 March 2012 <br /> AGE-NC Project No. 11-2049 <br /> Page 2 of 4 <br /> surrounding the UST area to depths of approximately 30 feet bsg. Soil boring locations are <br /> illustrated in Figure 2. <br /> Soil borings were advanced utilizing a truck-mounted, PowerProbe 9600 direct-push <br /> probing unit equipped with 1.25-inch diameter probing rods. The PowerProbe advances <br /> soil probe borings using a hydraulic hammer to drive sampling tools to specified depths. <br /> 2.1. SOIL SAMPLE COLLECTION <br /> Soil samples were collected at 5 feet and 10 feet bsg in borings SB1 through SB3 and at <br /> discreet five-foot intervals beginning at 10 feet bsg in borings SB4 through S137 using a <br /> 1.45-inch diameter Geoprobe soil sampling assembly loaded with one two-foot long <br /> acetate sleeve. After collection, a portion of the acetate sleeve was separated and the <br /> ends were covered with Teflon sheets, capped and sealed with tape. Sample sleeves were <br /> labeled with soil boring location, depth, time, date and sampler's initials and then placed <br /> in a chilled container. <br /> Soil sample duplicates were extruded into plastic bags and field-screened for the presence <br /> of organic vapors using an organic vapor meter (OVM), equipped with a photo-ionization <br /> detector (PID). Additionally, the soil was visually classified in accordance with the Unified <br /> Soil Classification System (USCS). PID readings and soil classifications were recorded on <br /> boring logs, provided in Appendix A. <br /> 2.2. GRAB GROUND WATER SAMPLE COLLECTION <br /> Grab ground water samples were collected from borings SB4 through SB7 at depths of <br /> approximately 30 feet bsg utilizing a Geoprobe Screen Point 15 Ground Water Sampler TM <br /> (GWS). Each ground water sample was extracted using inertial action by lowering Teflon <br /> tubing through the hollow center of the push rods into the GWS. Sufficient sample was <br /> collected to fill three 40-ml EPA-approved volatile organic analysis (VOA) vials and one <br /> 1-liter amber bottle, each without preservative. Ground water sample containers were <br /> labeled with soil boring designation, date, time, and samplers initials and then placed in a <br /> chilled container. <br /> 2.3. SAMPLE ANALYSIS <br /> Soil and grab ground water samples were transported under chain-of-custody to Cal Tech <br /> Environmental Laboratories (CTEL), a California Department of Public Health (CDPH)- <br /> Certified laboratory and selected samples were analyzed for the following chemical <br /> Advanced GeoEnvironmental,Inc. <br />