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� III I II I <br /> r t <br /> I F - �a • w v"'�z- .. -t .. - a• c .0 ^^ .. c-> ,!. _ _ ,r P' .. %s- »<.- -t a-^r...= * - r -w L,, - .r»'S'rr...rw.,�-rC LaIP' Ii <br /> IIi <br /> 27 September 2004 ' <br /> AGE-NC Project No 95-0142 r <br /> ! <br /> Page,3 of 7 <br /> I <br /> , , r <br /> Fuel additives di-isopropyl ether(DIPE), ethylttertiary-butyl ether(ETBE),MTBE, tertiary-_ }'±' <br /> amyl methyl ether (TAME), tertiary butanol (TBA) also 1n accordance with EPA Method <br /> Ito <br /> 8260B, and <br /> • pH - effluent in accordance with EPA Method 150 1 <br /> 3 1 <br /> = A k 3.4. FINDINGS ` <br /> From field data collected at the SVE remediation system between February and August 2004, AGE ` <br /> determined the average TPH'g concentration and the average flow- rate, and calculated the <br /> approximate mass and volume of hydrocarbons removed'Analytical results of influent ground`water -`s <br /> samples and ground water extraction measurements were used to evaluated the volume of impacted <br /> 1 ground water removed and mass of hydrocarbons treated <br /> 3 1 SOIL-VAPOR EXTRACTION <br /> t = <br /> The SVE unit operated continuously over the quarter,at varying flow rates ranging between 135 and <br /> approximately 200 cubic feet per minute (cfin) An induced vacuum (negative pressure) of <br /> approximately 34 to 48 inches of water was measured in` the piping between the blower"and- <br /> extraction wells <br /> I I n <br /> Hydrocarbon concentrations detected in Influent soil-vapor samples were as follows <br /> t , <br /> f0 April TPH and BTEX compounds were not detected <br /> I t <br /> • I May > The maximum concentration of TPH-g was detected from well EW-1 at ' <br /> 330 micrograms per liter(µg/1),'TPH-g also was detected 1n the sample from well VW-1 at <br /> ' t 280 µg/l and in the SVE influent stream at 130 µg'/1 BTEX were detected in sample EW-1, <br /> VW-1 and the influent sample at maximum concentrations of <br /> '12 µg/1 benzene, 1 8 µg/1 ` <br /> toluene and 14µg/1 total xylenes from sample°EW-1 and 0 50µg/1 ethylbenzene from sample <br /> I I <br />�I VW-I <br /> June The maximum concentration of TPH-g was detected from'well VW-1 at 19,0 µg/1, <br /> f = <br /> however TPH-g was not detected in the SVE influent stream Xylenes were the only BTEX <br /> f I compounds detected, at concentrations of 0 39 µg/1 (influent sample) and 3 7 µg/l (VW-1) ; <br /> • July TPH and BTEX compounds were not detected <br /> A ! 4 <br /> I <br /> 1 I <br /> I< I <br /> P <br /> Advanced GeoEnwronmental,Inc <br /> I�l3 <br />