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44 I Canepa's Car Wash <br /> E - Report Groundwater Mounding Study <br /> r r February 13,2002 <br /> _ - - - Page--2- <br /> Le- <br /> Mounding.Study <br /> _ t=� <br /> -1i October 2 00 1, Condor installed four monitor wells (MW 9, MW=10, MW-11, and MW-12d),as part of <br /> - - an additional soil and groundwater investigation (Figure l,:-attached).-Three of the monitor wells (MW-9, <br /> MW-10 and MW-11) were constructed with screened intervals from 25 to 45 feet to intercept'the <br /> water table: The addition of monitor well MW-10 providesr-important east-west groundwater.gradient <br /> _ - information along the northern boundaryof the site.. <br /> - As the•initial task in the.ground;water monitoring study, Condor surveyed the existing monit' ing.wells - <br /> (installed by a previous -consultant) -and the new wells -simultaneously. The new'..!survey '.'data were <br /> generally 2.01 to 2.05 feet higher than had been previouslyreported,4apparentlydue to the use of a - <br /> b different vertical datum{Table 1, attached).-It-also appears that fine previous survey data for monitor wells <br /> MW-6 and MW-7 were incorrectly reported as-1.25 and 0.60 feet low, respectively. The incorrect survey <br /> data artificially lowered the groundwater elevation-at the southwestern portion-of the site, resulting in the I <br /> . _._apparent groundwater mound near well MW-2. The groundwater elevation contours shown on Figure I <br /> ii- (attached)indicate a relatively uniform gradient to the east across the site <br /> Based on the results of the new-well elevation survey,the previously reported ground' <br /> water mound in the',. <br /> _ vicinity of well MW-2 is no longer evident. Consequently, no additional mounding study tasks:are <br /> proposed, and the mounding study is completer- <br /> _ L . <br /> V. <br /> -= - -1fyou have any questions or,require additional information, please phone us at(209)2340518 :@� <br /> Respectfully subm.itted,. <br /> CONDO ARTH TECHNOLOGIES,INC. <br /> - - _ 7 C C 0442E5 <br /> s <br /> - - - <br /> nio eject Managed'_ Jf �r <br /> Attachments <br /> AE- <br /> P11707 Ca epa-P.acific\Cov pondenceVen'ery Weng52-17-021-Wongdoc <br />�-' - - <br /> L . <br /> • .-- _ —� _ <br /> 1-- - - _ fit.- -""- _' p''� u-• T <br /> Rt <br /> 5 <br /> t 1.. - <br />>" <br /> is <br /> CONDOR <br /> F _ r s_ L. - IL <br />