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4 l.J f�f, 1,. 1 - .� J • GT 1 111 N I i1 -S .. <br />� A .� x. �a'; s ,- - r r r,'G -'. � � _ y,..1e •; , { •. , i'' .a• 1 a > <br /> k' -t 1 r �" -,t 2 '• 'x' <br /> p <br /> 10 January'2006 <br /> ^ =j }`AGE=1NCProject Na: 98-050 , ' <br />' 1.. Page 2'of <br /> , j :r <br /> i : laced a chilled "container;far + <br /> les were:labeled"and-p m <br /> f r reservative. After,collection,'the:5amp } <br /> j, p, , <br /> a California y <br /> transportation under chain of custody to Cal Tech Environm borat abon Paramount, ornla.The <br /> 1 De artment`of Health Services(DHS)-certified analytica rY <br /> sain .les were analyzed for: <br /> p <br /> `. Total.petroleum hydrocarbons quantified as.gasoline'(TPH-g) <br /> m accordance' with''EPA <br /> Method 8015 Modified; and <br /> • Ben2ene,toluene, ethylbenzene,'and total xylenes(BTEX) and fuel additives di-isopropyl <br /> r. arY <br /> s ether RIPE),ethyl tertiary=butyl ether(ETBE),methyl tertiary-butyl ether(MTBE);tern ry <br /> ( -butyl alcohol(TBA), 1,2-dichloroethane(1,2-,2 <br /> amy}methyl ether(TAME),tertiary- y <br /> • <br /> 1,2=dibrgmoethane(EDB) in accordance.with EPA Method 8260B. r <br /> 3.0 FINDINGS, <br /> Ground water elevations, flow direction, and gradient were determined from field'data collected he <br /> 16 June 2005.The Contaminant impact to ground water was quantified by laboratory analysis of the <br /> ground water samples. <br /> 3;1, GROUND WATER GRADIENT AND FLOW DIRECTION . <br /> time of the June 2005,.sampling event, depths to ground water at the site ranged from <br /> At the t <br /> 25.31 <br /> feet(MW 3)to 25.71 feet(MW-1)below the tops of the wellcasings.Grnnda �ateanlaverage <br /> at the site averaged approximately 16.77 feet below mean sea level (MSL), 1. g 2005 <br /> increase in ground water elevation of 2.66 feet since the last monitoring event in February <br /> 1' 1 <br /> Crround wafer,elevation data is included in Table 1. <br /> Ground water flow direction was calculated from the well.elevation data. The•gfound water'was <br /> ed to be #lowing toward the southwest'under"a hydraulic gradient <br /> ons asmeon <br /> iderr , <br /> 0.009:foot/foot (ft/ft).' Figure 3 illustrates the contoured ground water'elevations a <br /> .y. <br /> 1,6 June 2005. <br /> 3.2, ANALYTICAL RESULTS OF GROUND WATER SAMPLES ' <br /> TPH-g and MTBE were' detected in the ground water sample collected from Well MW-1 at <br /> per liter t and 280 µgll,respectively.Figure illustrates the <br /> " J. <br /> concentrations of 250 micrograms p (µlb ) <br /> ination at the site. <br /> 1. <br /> estimated extent of dissolved MTBE contain , <br /> .'�' Advanced treoEnvironnlental,Inc. r <br />