Laserfiche WebLink
qw <br /> .:, 15 November 2002 <br /> AGE-NCNo: 95-0173; <br /> Page 4 of 8 �• _ _ 7..: <br /> From field and laboratory data collected at the SVE remediation system between I 1=June 2002 and <br /> L26 September 2002,,AGE.determined-the average:TPH-g concentration, the average flow rate and . <br /> calculated.the.approximate mass and volume of hydrocarbons removed. <br /> 4.1. -. GROUND WATER'ELEVATION AND GRADIENT <br /> _ During the September`20.02 .ground'-water-monitoring- event, depths to ground water in the <br /> monitoring wells,were.-measured•between'29.38�-and 31:12 feet fielow-the tops,of well casings <br /> ground.water elevations,w .. calculated to be between'19.76.feet'.(MW-8) and 21.41 feet(MW-5) F Y <br /> ` .below-mean sea level. Ground water elevation at the site decreased an average 3.01,feet between the . :.` <br /> .June'2002_and the Septemlier' 2002'ground watermonitoring eveints.'The-screened-interval were <br /> a roximatel 10 to-30 feet <br /> below drowned m wells AW-1A AW-2B, a <br /> - ;. pp Y, . <br /> The ground water elevation data for the September'2002-ground water monitoring event is-depicted _ <br /> _ In Figure'3 Ground water flow direction at the-site was inferred.to be toward the northeast at a <br /> gradient,of 0.004 ft/ft or less, or approximately 22 feet per mile (Figure 3). <br /> 4.2. LABORATORY,RESULTS, OF GROUND WATER.SAMPLES _ <br /> A total of sixteeri ground water sainples were submitted'to McCampbell Analytical Inc. (MAI), a-'.' <br /> DHS=certified laboratory,for analysis. TPH-g was detected in ground water samples collected.frorn <br /> wells MW.4- through MW-4; MW-6, MW=9;.'AW-IA; AW-IB, AW=2A and AW-2B, at <br /> .concentrations -as, high-as 84 000 micrograms pprliter 1 in the-rsample.frorri AW-2A., The " <br /> iaboratoryreported each sample chromatogram as having unmodiPied or weakly modified"gasoline - l <br /> chromatogram patterns except for the-MW-6 and MW-9 samples which reported no recognizable <br /> 1 patterns (Appendix C). <br /> _ BTEX compounds were detected-'in ground water samples collected-from wells MW 1, through. l <br /> MW 4,-MW-6; MW-9, AW IA; -AW=.1B, .AW=2A and AW-2B at concentrations as- high as :. <br /> 25;000 pg/l (toluene; AW-2A)..The maximum benzene concentration was detected from sample <br /> AW--2A at a concentration of 7,800.g, /l. - l <br /> MTBE was detected in-a water-sample collected from MW-5 at a concentration of 0.64 'µg/1; <br /> Y _1,2-DCA was detected in water samples collected,from MW-5 -and-AW-2B at concentrations_ of <br /> 1.5 1 and:30 1 res ectivel :No other fuel corn onents were detected in th'" <br /> p� g� , p o-. ti y. p e samples analyzed. <br /> -Previous and current analytical results of ground water hiohitoring well samples are summarized in <br /> �1 Tables-3 and 4,respectively-The la_boratoryreports(MAIwbrkorder0209369).andchain=of custody , _ <br /> r <br /> _ forms are presented in Appendix C.- _ <br /> - �. . <br /> :Advanced GeoEnvi ro n mental,Inc.' <br /> - <br /> r { <br /> r— i <br />