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03 February 2012 <br /> AGE-NC Project No. 11-2040 <br /> Page 2 of 4 <br /> SOIL PROBE BORING ADVANCEMENT <br /> On 27 January and 31 January 2012, AGE advanced three soil borings (131 through 133) <br /> near the former UST area, two soil borings (134 and 135) in the truck repair area located <br /> inside Warehouse 4, and one boring (136) near the storm drain outside of Warehouse 4. <br /> Soil borings 131 through 133 were advanced to depths of 25 feet below surface grade (bsg) <br /> and borings 134 and B5 were advanced to depths of 10 feet bsg, utilizing a truck-mounted <br /> PowerProbe 9600, hydraulic hammer, direct-push probing unit equipped with 1 .25-inch <br /> diameter probing rods. Soil boring 136 was advanced to a depth of 5 feet bsg utilizing a <br /> hand-auger. Soil boring locations are illustrated in Figure 2. <br /> SOIL SAMPLE COLLECTION <br /> Soil samples were collected from borings 131 through 135 at two-foot intervals beginning at <br /> approximately 5 feet bsg, using a 1 .5-inch diameter macro-core sampling assembly loaded <br /> with one 4-foot long acetate liner. After collection, 6-inch portions of the continuous <br /> samples selected for analysis were separated, the ends covered with Teflon sheets, <br /> capped and sealed with tape. <br /> Additionally, soil samples were collected from borings 134 and B5 at 1 foot bsg, and from <br /> boring 136 at depths of 1 foot and 5 feet bsg, using a hand auger. The hand auger was <br /> advanced to the target depth, soil was extruded from the end of the hand auger. Soil was <br /> hand-packed into a pre-cut 6-inch portion of a 4-foot acetate liner, then the ends were <br /> covered with Teflon sheets, capped and sealed with tape. <br /> Sample sleeves were labeled with soil boring location, depth, time, date and sampler's <br /> initials and then placed in a chilled container. Soil samples were transported under <br /> chain-of-custody to Cal Tech Environmental Laboratories(CTEL), a California Department <br /> of Public Health-Certified laboratory and analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g), total petroleum <br /> hydrocarbons quantified as diesel (TPH-d), and total petroleum hydrocarbons <br /> quantified as motor oil (TPH-mo) in accordance with EPA-method 8015-modified. <br /> • Volatile organic compounds (VOCs) in accordance with EPA-method 8260B. <br /> Soil sample duplicates were extruded into plastic bags and field-screened forthe 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 /> Advanced GcoEnvironmental,Inc. <br />