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12 August 2009 AGE-NC Project No. 08-1633 Page 2 of 5 All rinseate generated during boring activities was containerized in properly labeled Department of Transportation (DOT)-approved 55-gallon drums and stored on-site. Soil borings were backfilled over their entire depth with Portland cement grout mix. 2.2. SOIL SAMPLE COLLECTION AND ANALYSIS Soil samples were collected at discrete 2.5-foot intervals utilizing a hand augur from surface to 5 feet bsg. Once the target depths of 2.5 and 5 feet bsg were achieved a sample was hand packed from the augur. Following sample collection at 5 feet bsg a Geoprobe push-driven 2-inch diameter soil sampler,fitted either four six-inch long stainless steel sleeves or a 2-foot acetate sleeve,was utilized to collect samples at 2.5-foot intervals from five feet bsg to termination depths of 10 and 20 feet bsg. Samples were collected at 2.5-foot intervals in borings B 1,B2,B4,and B5,beginning at 2.5 feet bsg, to the depth of 10 feet bsg.Additionally,soil samples were collected every 2.5 feet in borings B3 and B6 to a termination depth of 20 feet bsg. Soil samples collectedusing stainless steel liners were preserved by covering both ends of the second stainless steel sleeve with Teflon sheets, capping and sealing with tape. Samples collected using acetate sleeves were cut from the 2-foot liner at the desired sampling depth, capped and sealed with tape. Each preserved sample sleeves were labeled with soil boring location, depth, time, date and sampler's initials and was stored in a chilled container under ice. Soil samples were transported under chain-of-custody to Cal Tech Environmental Laboratories (CTEL),a California Department of Public Health(CDPH)-certified laboratory and analyzed for the following: • Total petroleum hydrocarbons quantified as diesel(TPH-d)in accordance with EPA Method 8015 Modified; and • Benzene,toluene,ethylbenzene,and total xylenes(BTEX)in accordance with EPA Method 8260B. 2.3. GRAB GROUND WATER SAMPLE COLLECTION AND ANALYSIS Grab ground water samples were collected from boring B3 at 23 feet bsg and boring B6 at 22 feet bsg. Significant soil saturation was not noted at the initial targeted depth of 20 feet bsg when advancing borings B3 and B6. Subsequently,the sampling rods were advanced an additional 3 feet in boring B3 and 2 feet in boring B6 to allow for sufficient water to be collected. Advanced GeoEnvironmental,Inc.