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<br /> 1'8 April'2003 1 f I di I '
<br /> AGE-NC Project No 97-0333
<br /> Page 6 of 11 �11 n ;' ,� ��� I�,ir' . I ' ,
<br /> 1 3 3 ' LABORATORY ANALYSIS OF GROUNDWATER SAMPLES
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<br /> Each ground water,sample was lagged on a chain-of custody form,placed in a chilled container and,
<br /> transported to'a California Departrnent'of Health Services (DHS)-certified laborator0or analysis _'IE'i
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<br /> 'r for
<br /> • TPH-g and `TPH-d by EPA„ Methods„ 5030/8015 ,andf LUFT/EPA Method 8015B,
<br /> respectively,
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<br /> • BTEX by EPA Method 8020, and h ''
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<br /> •1i ;Volatile organic compounds, including PCE, TCE„1,2-DCA, EDB,'MTBE, TAME,DIPE,
<br /> ETBE and TBA by EPA Method 8260 Modified a
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<br /> 34 FINDINGS N
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<br /> Ground water[elevation, flow direction and gradient were determined from field data collected on
<br /> 10 November 2002, the contaminant impact to ground water was quantified by laboratory analysis ,
<br /> ' of water samples collected on 10, 11 and 12 November 2002
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<br /> 3 4 1' Ground Water Elevationland Gradient
<br /> ,I The depths to ground water were measured at between 20 38 feet(MW-11 A)and 22 20 feet(MW-6)
<br /> ' below the tops of the well casings on'f10 November 2002, ground water elevations were calculated
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<br /> ' to be between 11 05 feet(MW-11D)and 1164 feet(MW-1'0B) above mean sealevel(MSL) (Based
<br /> ! on current and previous monitoring data collected from wells MW-1 through MW-6, ground water 1
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<br /> elevation at the site generally increased an average 0'37 feet between,the `August 2002 and the
<br /> Ik i November 2002 ground water monitoring events
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<br /> C Ground water elevation data collected from multi-level wells MW-11, MW-12 and MW-13
<br /> 'I� 10 November 2002 is depicted on cross section°F--F' (Figure 3) The vertical gradients between 1
<br /> adjacent screen intervals are depicted on cross section F-F', the vertical gradient was'calculatedby
<br /> determining the difference between ground water elevations (dh) and dividing by the difference of
<br /> the screen interval midpoints(dl) Generally,very slight downward vertical gradients were observed I ��
<br /> between the First Zone,Second Zone,Third Zone and Primary Zone screen intervals of westernmost,
<br /> well MW-11 Eastward's along cross section F-F', mainly neutral gradients were observed,,at well,
<br /> MW-12 and alternating gradients(downward'in the First Zone, upward in Second'Zone, downward
<br /> in Third'Zone and neutral or,upwards in the Primary zone) were observed at easternmost well
<br /> 'MW-13
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