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I T'd E+r=r � r 'I I r•r. r ,r r i A' -' �. <br /> 41 <br /> - <br /> ',. y {� + � Ir�VI �' �' r -` _ .ti _ `• 1 r - r, r I ,n .. ,_ ''I l I =i ; <br /> r� µ.'ij !I ..L F '• r I '�5. i �,}� S h I' S , �� ., h� �-o,.if an qr <br /> i 23.•January 2006 'A <br /> A <br /> AGE NC=Project No.'98-0504 <br /> 'Page 2 of Ory h_ <br /> 'transportatioii under chain of custody to'CalTech Environmental Laboratories(CTEL),'a California:', <br /> Department.ofHealth Services(DHS)-certifiedanalytical laboratory in Paramourit,•California.The„�, <br /> samples were,anaiyzed for: i <br /> Total:petroleum'hydrocarbons quantified as gasoline (TPH-g): in accordance;with EPA ' <br /> Method;8015,Modified; and <br /> •' Benzene,''toluene, ethylbenzene;and total xylenes (BTEX) and fuel additives di-isopropyl; . <br /> ether DIPS eth l,terti -but 1 etherETBE meth� l terti -bu 1 ether((MTBE),tcrti ' <br /> amyl m-ethyl ether,(TAME),tertiary-butyl alcohol(TBA),4;2-dichloroethane(I 2-DCA),and <br /> 1,2-dibromoethane (EDB) in accordance with EPA.Method 8260B. <br /> 3.0. FINDINGS <br /> Ground water'elevations, flow direction, and gradient were determined froin field'data collected on <br /> 02 Se' tem er 2005.The contaminant im act'to round water was quantified b laborato an sis <br /> p p g. q Y rY Y <br /> of the ground water samples. <br /> 3.1. GROUND WATER GRADIENT'AND FLOW DIRECTION <br /> ,At the time of the September 2005 'sampling,event, depths to ground water at the site ranged from. <br /> 26.69 feet(MW-3)to 27:09.feet(MW-I)..below the tops of the well casings.Ground water elevation` _ <br /> 'at the site averaged approximately 18.16 feet below mean sea level (MSL); indicating an average , - <br /> decrease in ground water elevation of 1:39'feet since the last monitoring event in June 2005.Ground <br /> water elevation data is in_eluded in Table 1: <br /> Ground water flow'direct on was calculated from the well elevation data..,The ground water was <br /> inferred to be ,flowing' 'toward the southwest.under a hydraulic•.gradient of approximately, <br /> `r 0.009 foot/foot (ft/ft).•'Figure,3,illustrates the contoured ground water elevations as measured on <br /> 02 September 2005. ; <br />,. : 3.2:' ANALYTICAL RESULTS OF GROUND.WATER SAMPLES <br /> = . and MTBE were detected in the round water sample collected from well 'MW-1 ' <br />_. •.TPH g g p at .. <br /> concentrations of 200 micrograms per liter(pg/1)and 210 gg/l,respectively. Figure 4 illustrates the ' 1 <br /> ' estimated extent of dissolved MTBE contamination at the site. ; <br /> Advanced GeoE&ironmental,Inc. h <br /> r',.•y ';I 1. '• •!. , A.. r ' - , , r '• ' !, i <br />