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I 05 January 2004 AGE-NC Project No. 95-0137 ►' Page 3 of 8 ; 2.2.2. Collection and Analysis of Ground Water Samples Water samples were collected from the purged'wells using new disposable plastic bailers after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume.Each sample ' was transferred into three 40-m1 EPA-approved volatile organic analysis (VOA)vials and into one 1-liter amber bottle. Samples were properly labeled, stored in a chilled container and transported ' under chain-of-custodyto Cal Tech Environmental Laboratories(CTEL)a California Department of Health Services (DHS)-certified laboratory in Paramount. Each sample was analyzed for- a Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in ' accordance with EPA Method 8015 Modified; and • BTEX compounds and the oxygenating fuel additives: methyl tertiary butyl ether(MTBE), t tertiary butyl alcohol(TBA),di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl ether(TAME), ethylene dibromide(EDB)and 1,2 dichloroetharie(1,2- DCA) in accordance with EPA Methods 8260. 23. CONFIRMATION SOIL AND GROUND WATER SAMPLING Based on analytical data collected from the SVE progression and the ground water wells, ' confirmation soil and ground water collected from within the area of petroleum hydrocarbon-impact at the site were required to determine if continuing remedial operation is necessary and serve to approximate remaining petroleum hydrocarbon concentrations. 2.3.1. Soil Sample Collection and Grab Ground Water Sample Collection ' On 14,E 15 and.17 October 2003, five soil probe borings (CB I through CB5) were advanced at the site,under EHD oversight.Probe boring CB-I was advanced adjacent to monitoring well MW-1,CB- ' 2 aduancad-was advanced adjacent to boring B4, boring CB-3 was advanced between vapor wells VW-1 and VW-11,boring CB-4 was advanced between boring B4,vapor wells VW3,VW 1 and air- sparging well IAS1, while boring CB-5 was advanced adjacent to the north property bou ary, V4 ' between well MW-2 and vapor well VWT Probe borings were advanced to a total depth of et 8/13f below surface grade(bsg) and a grab ground water sample was collected from each boring at 4k) to feet bsg, except at CB3. Locations.of the soil probe borings are illustrated on Figure 2. ' h�dro�unr k sshgfter'd s rto wMee dam 01 e- was Soil samples were collected frommrtt;probe borings at 5-foot intervals,starting at five feet bsg,using a Geoprobe soil sampling device loaded with four 6-inch by 1.125-inch brass sleeves.The ends of the ' soil-filled second sleeve were covered with Teflon sheets, capped and sealed with tape.All samples were labeled with the boring designation with depth, date, time and site location. ' Advanced GcoEnviron mental,Inc.