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- j5 F iiN T. 10 June. 1998 4W, n0j AGE NC Project No: 96 0229 ,- r3 Page 2 of 5 = - F _� . = �^' -- "' " J <., .meg 2'.2 GROUNDWATER-SAMPLING x s r a ' `Yar level in monitorin we s'- through MW 6 achieved'a minimum ofE80 � } The ground water.l g ,. a _ .,.. _ g percent recliar e recove rioi to sam le collection. Ground,water samples were collected util�z�n g ry P .., p - g ;' 4 disposable polyethylene bailers ani new nylon'rope sdficiept round water sample was collected � = = - y>: v al's containtn. 0.5 m1z�I8%o=hydrochloric= from each well to fill three.40 mI`EPA approved VOA _t, g i = . " s as.a preservative for:the samples Care ��as taken to_ensure_that_visible airbubbles were not^ r( acrd - x ul ' present.:n;the V_OA;vials after.filling an`d capping Ground water sample containers,were labeled _ :I F = w with the`_ell designation, date,time and sampler's initials -t~ � � r cLL'�,' ;'''F, > Alp, ��_'fi^" _ ;, ..�•'cr`'y� ,� .x" = aye , t A 23 LABORATORY ANALYSIS OF GRQUND_.WATER SAMPLES _ Each groundwater sample v�ras logged.on a chain of custody form : laced in a:cli4. illed container ands _ X13 transported to a California state-certified iaboratory.for analysis �ri ac�cordance.with the following At rr� S 9 i r, F...y,.r. EPA method 8015M for total etroleum h drocarbons uant�fied as a' line TPH= ' P. Y. q g ( g) _ _ _ R .EPA method.8020Tfor valatile�aromatics (benzene; toluene, ethyl benzene andraylene _ `; r BTE&X) with methyl tertiary butyl ether(MTTBE) s � � EPA method 8260 for volatile organics(including oxygenates) ` _ _`� �` ' '"- t - 4r, s'Sry The Iaborato '+'re -ort{.(McCain Bell Anal,yt ical Inc Lab I D 89336-to 8934.1 and chain of custod . -- - ' P " I� } y forms are presented_in Appendix B `• , ^`fir F a` _ ' ;�'a - _ ;£ R 3.0 FINDINGS `� �-y' '- a--: _•.,� .a -t�� `= r•r - „_� � ,re�_ "_S. 5'�X�- 3-.�a�_ P �s.i+fi�€. � - 3:1 RELATIVE GROUND WATER ELEVATION AND GRADIENT f .The depth-s,to'gWund water iri;the monitor�ng.wells�were measured between.22 99 and 25:17 feet; .-. „ below the tops of the well casings: Betty ween November 1997 and May 1998 round water.elevation= 1 g { aincreasedA. an average-,:j 0 25-feet-at-the site. During the May 1998 ground«iter .-monitoring;event;the gradient was calculated to be 0003 ftJft ' or approximately�l,7 feet per.mile f gure3) Ground water mom'toring.:data collected in the area of= � Y_ -the monitoring wells suggests:that 'the_ ground--water flow direction-_was-,generally toward the: fes' northeast The groundwater elegy anon data'for:the'monitoring=wells during th6fMay 1998 grounders "4 - _ — water monitoring event �s depicted inTPigure 3 Monitor�ngxwell MW 1 ;wasznot utilized- .gni= t Wr " '� �„ '4- s, - *'-r - ♦ �. i, • a ,.'5 ��-sem' dvi 41 OFF a r> �.