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1 23 April 1999 AGE-NC Project No. 95-0100 ' Page 2 of 6 ' Probe boring CB 1 and CB2 were advanced at the northern and southern ends of the former dispenser island,respectively. Borings CB 1 was advanced to a depth of 60 feet below surface grade(bsg). Soil boring CB2 was advanced to a depth of 35 feet bsg. Soil samples were collected at 5-foot intervals, ' beginning at a depth of 5 feet bsg to a depth of 55 feet bsg in boring CB 1 and to a depth of 35 feet in CB2. The soil borings were advanced at the site using a van-mounted Geoprobe 5400 probing unit equipped with 1.25-inch diameter probe rods with a 2.15-inch diameter soil sampling assembly,pre- loaded with four six-inch by 1.125-inch brass sleeves. After soil samples collection all soil sleeves ' were removed from the soil sampler and the ends of the second 6-inch brass soil sleeve were covered with Teflon sheets,capped and sealed with tape.The sample containers were labeled with the sample identification(boring location, time and date). The sleeves were placed in a chilled container. Following collection of soil samples from boring CBI, ground water was encountered at approximately 55 feet, as inferred from saturated soil samples collected at 55 feet bsg, at which point a Geoprobe water sampling assembly, equipped with a slotted PVC screen, was advanced into the boring to a depth of 60 feet bsg. The PVC screen was then exposed to the saturated soil. Ground lie water was allowed to enter the casing and a water sample was retrieved using a modified PVC tubing bailer. A sample was then drawn to the surface. The grab ground water sample was transferred into a laboratory 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0.5 ml 18% ' hydrochloric acid as a sample preservative. The sample containers were labeled with the sampling identification (boring location,time and date). The samples were placed in a chilled container. ' 2.2. EQUIPMENT DECONTAMINATION ' All sampling tools and brass sleeves used for sample collection were thoroughly rinsed with clean water after washing with a solution of Alconox. All Geoprobe rods were cleaned prior to advancement of each,probe boring. ' 2.3. SAMPLE ANALYSIS The soil samples and the `grab' ground water sample were logged on a chain-of-custody form, stored in a chilled container and transported under chain-of-custody.to McCampbell Analytical_Inc. a California Department of Health Services (DHS)-certified laboratory. The soil samples and the grab water sample were analyzed in accordance with: • EPA Method 8015 Modified for total petroleum hydrocarbons uantified as gasoline TPH g) and - Advanced GeoEnvironmental,Inc.