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<br /> -; AGE NC Project No 98 0433 = '�,`s f�� - � - - �-�, z T°
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<br /> r 2:2: # GROUND.WATER'SAMRLE COLLECTION - - �:_« __x . ,,
<br /> ` 'Prior to the collection of ground water samples;the depth to=ground aterwas°re-measured iri.each.-
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<br /> monitoring well to ensure=tliat a minimum 80%�ofthe,imtial_water volume had recharged'Water .-
<br /> C"'�Y` :sazri les wve' ---- collected from each well using,a dis osable lactic bailenjil addition;awater = R�
<br /> sample was collected-from the dome_stzc well(DW 1);on site by allowing the well pump to operate ' ,...
<br /> t � P � for one minute,,then collecting=a-water sample from a dedicated sample tap ' � �=
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<br /> _ _r.,�: �.The�water fr _6 ch-mori toring=well Was traiisferredanto-tliree chilled-- . J Ifter��(ml)volatile`T
<br /> -organic-Analysis {VOA)*vials contaiing_0 S�ml hydiochlor�c acid�salution {18%)as a sample
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<br /> t-C_],x;;q.- _- preservative and onel�hter--=amber'bottlewithout preservative Water from the-d_orne5hc well was :
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<br /> E 5 T m poured d13 tly into the sample containers from a dedicated sample;tap �� & `��-�' `�
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<br /> After collection;the_ samples were labeled-and placed in a chilled container for transportation under "' � c
<br /> chain ofcustody_to_Cal Tech-Environfriental Laboratories(GTEL),-'' ate ofCalifomia_Department
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<br /> . of Health Services (DHS) certified'analytical laboratory Each sampl was analyzed for _-
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<br /> ���r �• Total ;petr6leurn hydrocarbons quantified as gasoline and diesel (TPH g and IPH d, _ r �
<br /> ILT - respectively)in accorciance_with EPA IVlethod'8015 Modified, and �� •- `�
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<br /> W� �- . -• Benzene; toluene, ethylbenzeni; and total xylenes (BTEX) and the fuel additives methyl
<br /> �- r. tertiary butyl ether(MTBE); terCiary butyl iii oA (TBA);di isopt6pyl ether",(DIPE},_ethyl '
<br /> =Yf i : tertiary=butyl ether(ETBE),-tertiary t,iMylrymet4yl ether(TAME},ethylene dibfd de(EDB); �� <> ;
<br /> 1. 3 _ - - .- - �.t-x ..p _ =. _ -
<br /> _� x and 1 2 dichloroahane (1,2 DCA) in accordance with EPA Method 8260B ; _ � -
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<br /> z - Grbund.water elevations were determined by subtracting the measured depths to water from the k
<br /> - surveyed casing elevations Grouridjwater-flow directions were determined bycoritouring the water � '
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<br /> , elevations on a-,scaled site plan�(Figure 3}. Theampact ofthe-unauthorized:release7.ori ground'water �._ `,
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<br /> - was quay .ied,_by laboratory-.analysts of the samples collected rt ,
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<br /> �- -,9 3 V GROUND WATER GRADIENT,AND`FI OW DIRECTION" L � -� "'
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<br /> -� Depth tl ground water`m the ells.ranged from 25:46'Fee..to 27 25•feet below the tops of file well - � - -�_
<br /> casings :The.:ground water.elevations of the site ranged ff qrp- =51 feet (MW 6)xo 3 lµ62 feet : _ -
<br /> - � _ (MW 8)-above mean level(MSL) The data indicates an average ground water elevation increase _
<br /> "1 of.0.:46 feet rn the wells since she Jul -2044 monitonn event..De thsto- rJjV ourid water and calculated� w
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