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coi. 14 1 '• <br /> r <br /> ;- u <br /> 15 November 1999 ; - i ,;" ,_, <br /> •AGE' � •, .. ., ' 4 ' _ <br /> NCProject No.-95-0106•. ' <br /> Page 2 of-4 <br /> of'sampling and.the sampler's initials. The samples were transported in a chilled container-under ''" t -'i <br /> chain of custody;to'NMCampbell-Analytical,Inc. (MAI), a:Calif6mia Department1of Health Services ' <br /> (DHS) certified,analytical laboratory for,analysis. The samples were analyzed for <br /> Total petroleum hydrocarbons quantified as gasoline (TPH g) 'in accordance With EPA,p <br /> Method 8015-Modified, <br /> o• Volatile aromatic,compound's,,specifically benzene, toluene, ethylbenzene,and total xylenes <br /> t _ <br /> (BTEX) with,inetliyl tertiary butyl ether(MTBE) iii accordance with EPA'Method 8020, and h. <br /> Oxygenated fuel additives: MTBE,tertiary butyl,alcohol (TBA), di-isopropyl ether(DIPE), <br /> - - l 1 +) <br /> ' ethyl tertiary butyl ether(ETBE) and.tertiary.ar y methyl ether(TAME) in'accordance with i <br /> EPA Method"8260-Modified. ' �� `y ' <br /> 0. !"FINDINGS, . <br /> Groundwaterelevation and flow direction.were calculated from.-field data;.'hydrocarbcn-iimpaet to t. ; <br /> ' ground water-was inferred from•laboratory analysis of the'ground,water samples: <br /> 3.1, ' GROUND WATER ELEVATION-'AND FLOW DIRECTION' <br /> The"average relative.groundwater elevation, not counting MW6,.declined ari average of;1:0 foot <br /> 'since th'e'last monitoring`event and the"average flow direction_iwas radially northward': The average; <br /> • �� w 't ward the�n�in the-area'st ata f' radient'bf a� raximafel 0;01 � MW1, NfW4,•IVIW6, • <br /> ground water flow directio enclosed'by monitonn wells M <br /> and MW3 as o northea' g pp . y ft; and was.toward the' <br /> 'northwest in the area boune-d+b MW 1 'M' WS and.'MW4 atra.gradient of roximalie0:014 ft/ft. <br /> 1 - d_ y � 7 . . pp .Y. <br /> 1-' Ground water elevation data is'presented-in Table'I",the contoured;groundwater elevation-data,is. ..'.. <br /> shown,on Figure 3: } <br /> I12. 'LABORATORY RESULTS OF'GROUND .WATER SAMPLES <br /> Petroleurri hydrocarbons were detected'in the ground:wate`r;samples collected from_ moiiitoring wells <br /> z= <br /> ;MW-1' and MW- MW-1 is;�located-slightly'cross and down-gradient from ,the former UST <br /> r <br /> excavation and MW-41s located'furtlier north in:the Igenerally_down-gradient direction. TPH=g'was <br /> 1 detect_edat•concentrations of 39.0 micrograms perliter(4g/1),and 1,700'µg/l;:respe6tively,' in samples <br /> from the'two wells. Benzene was detected at,94µg/1 and'56'.µg/l iri.samples;from MW-1 and MW-4, <br /> re spectively..Other•volatile aromatic compounds were detected at concentrations of 23',ugll ad .1.1,_ <br /> ,Advanced GeeEnvironmentsl,Inc: <br />