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441 21 September 2000 <br /> er, AGE-NC Project No. 97-0360 <br /> Page 4 of 8 <br /> Each preserved sample was logged on a chain-of-custody form, placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory under chain <br /> of custody; selected samples were analyzed for: <br /> .,., • Total Petroleum Hydrocarbons as gasoline (TPH-g) and diesel (TPH-d)by EPA Method <br /> 8015Modified; <br /> `a • Volatile aromatic compounds-benzene, toluene, ethyl-benzene, and total xylenes (BTEX) <br /> and methyl tertiary butyl ether(MTBE) by EPA Method 8020; and <br /> • Tertiary butanol (TBA), di-isopropyl ether (DIPS), ethyl tert butyl ether(ETBE) and tert <br /> amyl methyl ether(TAME), and MTBE by EPA Method 8260 Modified. <br /> Aw <br /> 3.1.2 . Ground Water Sample Collection <br /> i.,. Grab ground water samples were collected from Pl through P8 using a temporary PVC screen.The <br /> probe rods were advanced to a depth approximately four feet below the water table.The hollow steel <br /> rods were then pulled out,and a screened casing was inserted into the saturated zone. Ground water <br /> was allowed to enter the casing, and samples were retrieved using a modified PVC tubing bailer. <br /> Sufficient sample was collected from each of borings PI through P8 to fill three 40-m1 EPA- <br /> approved VOA vials containing 0.5 ml 18% hydrochloric acid as a sample preservative and one <br /> L- 1-liter amber bottle without the sample preservative. Ground water sample containers were labeled <br /> with probe boring designation, date, time, and samplers initials. <br /> The preserved sample was logged on a chain-of-custody form, placed in a chilled container and <br /> transported to a DHS-certified laboratory; selected samples were analyzed for: <br /> 0 TPH-g and TPH-d by EPA Method 8015Modified; <br /> • BTEX with MTBE by EPA Method 602; and <br /> • TBA, DIPE, ETBE, TAME and MTBE by EPA Method 8260 Modified. <br /> 3.1.3. Equipment Decontamination <br /> Prior to sample collection, Geoprobe soil and ground water sampling equipment was thoroughly <br /> rinsed with clean water after washing with a solution of Alconox. Geoprobe rods were thoroughly <br /> cleaned prior to soil probe boring advancement. <br /> '" Advanced GcoEnvironmental,Inc. <br />