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13 December 2002 <br /> AGE-NC Project No 02-0926 <br /> Page 2 of 4 <br /> DRILLING AND SAMPLE COLLECTION <br /> On 17 October 2002, three soil probe borings (B-1 through B-3) were advanced at the site as part <br /> of the assessment activities The field work was conducted as outlined in the AGE-prepared Revised <br /> Work Plan Addendum -July 2002, dated 18 July 2002 <br /> The soil probe borings were advanced utilizing a van-mounted Geoprobe 5400, equipped with <br /> 1 25-mch diameter probe rods with an attached 1 50-inch diameter soil sampler, using a hydraulic <br /> hammer to drive the soil sampler to the specified depths The three borings were advanced vertically <br /> to depths of 15 feet below surface grade (bsg) <br /> During the boring operation,soil samples were collected at 5-foot intervals,beginning at 5 feet bsg, <br /> to the total depth of each boring Each sample was collected utilizing a 1 50-mch Geoprobe soil <br /> sampling assembly loaded with four six-inch brass sleeves After collection,the ends of the second <br /> brass sleeve were covered with Teflon sheets, capped and sealed with tape The sleeve was labeled <br /> with soil probe boring location,depth,time,date and sampler's initials and then placed in a chilled <br /> container Then the soil from one of the three remaining sleeves was field-screened for the presence <br /> of volatile organic compounds,using an organic vapor meter(OVM)equipped with photo-ionization <br /> detector (PID) Soils encountered in the borings were also visually classified by an AGE geologist <br /> in accordance with the Unified Soil Classification System(USCS) Following soil sample collection, <br /> all probe-boring locations were abandoned by backfilling with portland cement from the total depth <br /> to surface grade <br /> EQUIPMENT DECONTAMINATION <br /> Prior to sample collection,the Geoprobe soil sampling equipment was thoroughly rinsed twice with <br /> clean water after being washed with a solution of Alconox In addition, the Geoprobe rods were <br /> thoroughly cleaned prior to soil probe boring advancement <br /> ANALYTICAL METHODS <br /> Three selected soil samples were transported under chain-of-custody to McCampbell Analytical,Inc <br /> (MAI), a California Department of Health Services-certified laboratory, for analysis for <br /> • Total petroleum hydrocarbons as gasoline (TPH-g) as diesel(TPH-d) and motor oil(TPH- <br /> mo) in accordance with EPA Method 8015M, <br /> • Volatile organic compounds by EPA Method 8260, and <br /> Advanced CeoEnvironmental,Inc <br />