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4 �'JZ 14 <br /> TEL No , <br /> FACILit '- Defense Distribution Region West (DON) i Tracy <br /> OtAt t 6 N trdcy <br /> 136M P,brand fax transmIttAl rnerno 7671 #GfP890" <br /> CONSU-LUNT! Corps of Engineers lom6gm wa I lavq!p <br /> PVV (-A) 70 <br /> PROPOSAL OATE: April 1919 -L113Fall I <br /> PA <br /> M0,:hitdrihg Well(s) <br /> soli Boring{sj SEP 0`41992 <br /> Soil I EXC4VWCHO upth ENVIRONMENTAL HEAL114 <br /> OERMITISERVICES,, <br /> Supply wells, depth approR. goo' b9s. <br /> Nos. 8 and 0 <br /> cohc6r6linj th6 tb('-)vd check items and the j <br /> prop6sal is acceptable: <br /> We have reviewed the Pi-: OSAi <br /> 4 <br /> Date. l <br /> 4 Septemb092 <br /> From a water qualit.1y perspective, the supply wells should bO j-httalled In the furthest' <br /> most up. gradient location (1 ,e. j iA the touthWo§terh portion' Of i the tithie) and the Lower <br /> Tulare Formation Must be Se61td off .fto;� thO Upper tular� �orma wch is contaminated <br /> h We assume that th6 primary casing will be <br /> extPrided through the Corcor6n 01 <br /> with volatile organic cohstltuO .tt6Y (to the bAtt of this unit) to prevent cross-contamine- <br /> tion ftoin tht Upper TUlAre to the LoWet- Tul6rL. <br /> The final screen interval should be based on )ithologic and hydrologic data collected not be restrictive. <br /> during drilling and logging: The gravel Pack should <br /> I.n addition, we rttommdbd that the well design be reconsidered for 6e following reasons: <br /> interval above the screened casing section should be reduced in length. <br /> The gr6vel pack in be' seale <br /> portion f the proposed 230' of gravel p&ck 14TI the annulus should instead kmajor port 0 <br /> vilth cement to; oss-contAnflhation. within the. Lower Tul6re Fm. Well <br /> 1. Reduce the potential fOY6 cNo: 1 at the 'situ Was r�eenti ab <br /> l� 'andohed 6nd tagip-ling at blb'- to 6321 bgs, (prior to <br /> Y rations of pesticides in the ground water samples. <br /> abatidonment) . rosAalgd low' concent tend to increase <br /> 2i Reduce well loss'es'.Astod6t6d With A long gravel -VaCkUIM'S would <br /> well efficiency, and reduce 'the toUTA§r1avel loss (from the gravel pack) over the <br /> life Of tfiL6 well <br /> The wells should be electric logged (SP and NesistivitY) . <br />