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� I 7�7t � .:,PYA',n F �' + ly�,. t Yi- � i i`�•. I '"� Y st.; i a 5 r: -., ' -'� 5 s - i ,i - i. ' t �i - Yi' - I . n • I.' i l (til 1 I a .• _ '- 3 ' i r a}, .a. f - }i I y. , ''i I �' 1 . April I � •'i 11,y :• I �{ 5' ril 2005 `AGE=NC-ProectNa.•98=0504 a q, 1. ,r 'Page2'of 4 r, transportation under of custody to Cal Tech Environmental Laboratories(CTEL),'a California " I .. DepartmentIof Health Services(DHS)-certified analytical laboratory in Paramount;California-. The r ;samples were analyzed for., Total petroleum,hydrocarbons;quantified as gasoline {TPH-g}.in accordance'with EPA '' f ' Method 8015 Modified; and 'Benzene,',toluene, ethylbenzene,. and total:xylenes (BTEX)and fuel additives di-isopropyl'..`. +5' ' ether.(DIPE},ethyl tertiary 11 methyl tertiary-butyl ether(MTBE),'tertiary�" 'am tmeth 1 ether JAMEtertiary-butyl.aleohol TBA 1 2-dichloroethane 1 2-DCA arid; 1,2-rdibromoethane (EDB) in accordance with'EPA'Method K6613. 4,. 3.0. ' FINDINGS J ` Ground water elevations, flow direction;and gradient were determined from field data collected on 03 November 2004.The contaminant impact to ground water was quantified by laboratory analytical data. . 3.1. -GROUND WATER GRADIENT AND FLOW DIRECTION At-the time of the November 2004 sampling event, depths to ground water at the site ranged.'from 29.44 feet(MW73)to 29:80 feet(MW-2)below the tops of the well casings. Ground water elevation t at the site averaged approximately 20.82 feet'-below mean sea level (MSL), indicating,an..average decrease,in ground water elevation of-1.20 feet since the last monitoring event'in August 2604.1-"-, Ground water elevation data is included in Table L ,Ground -water flow direction was calculated from the well elevation data...The ground water was inferred to flow south-southwest under a hydraulic gradient of approxim'ately 0.01•foot/foot.'(ft/ .). ' Figure 3 illustrates the contoured ground water elevations as measured on 03 N6vember_2004 ,) I ' 1.3.2. 'ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g and MTBE were detected in the ground water sample-collected from well MW-I at concentrations of 100 micrograms per liter 1 and 98 1 res ectivel . c P,i p (µ ) Vg/l, P y No additional'petroleum hydrocarbon compounds were detected in the samples analyzed.Analytical f� ;• : results from the ground water samples are summarized in Table 2. The laboratory report.(CTEL ''. Advanced GeoEnvironmentai,I6.