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^ i • ie - 23 March 2006 - -- Y _ 887 , } -Project No. Ul-O t•� _ -_ - E NG�Pro'e - Y Page 4 of 5 : - Following sample collection,each preserved sample sleeve will.-6e-Labeled with the boring location, depth,time,-date,and sampler's irutals._Appropriately sealed_an-labeled samples will be placed in .; –- - . achilled confaiiierand=trap'sported-under-chairi_ofcusto dy to a-DHS'certified laboratoryfor analysis for the constituents listed in.Section = = 3.2:- 'WE _COMPL-ET10N ANI] .WEL-L tEL LL EVAT10N SURVEY _ f _ � _ Pilot borings MW75 through'MW--9-will•be cbmpleted'as ground.Watermonitoring wells utilizing 2-inch diameter;Schedple 40 polyvinylchloride(PVC)blank well.casing.and 0.020 inclrslotte`d•well- - r screen installedTrome30 feet to 35°.feet.bsg ori 6orings`MW-S through MW-8 and frotri SS;feet to _ 60 feet in-boririg.MW-9:Proposed_monitoring w lI construction diagrarns are depicted on Figures,3.T.w - and=4 h _ = _ :- - - - After_installing the well easing in each p{lot'boring; a_filter pack material consisting of.pre-washed - #3-Lonestar sand will be_added:through the_augers,frorri_total_depth.to approxiirmit ly-2 feet above the--screened_interval...Following.placement-of the-filter:pack, the:;well,'will be surged to assist'in } settling the filter pack::.Additiorial sand will be added if settling occurs A norriiiial 2'-foot lientonxte = - j - - — +.. +4 - - chipseal Will be placed above the f lter pack to mimrntze thepotent�al for-grout penetration into the. - screened section of wells:The bentonite-seal will be=formed I?. ourin`bentorute- -ellets irto ttie - _ _ Yp g p annulus and,allowing them to�settle on the filter pack The bentonite wilhbe allowed-to.ltydrate for. a.minimum 6f/2-hour prior`to grouting Th emaining annular space will be filled to withxna�foot' . of the ground'surface.with�a:cemerit=grout.__The grout mixture will consisf of Type I/II portil'arid neat ; — = - - cement and not more than 3-gallons of_water.per 47:-pourid sack o£=cement.-A grouting.inspection: f will be'scheduled witli�EHD personnel Following coriipletion`of the monitoring wells, well elevation"s and locations Will:be.'surveyed by a _ T Cal ifornia-lrccnsed.surveyor. 'r 3.3i-.,- .WELL DEVELOPMENT-•^ _ 77- Development_:of-the-proposed wells-will:consist•-ofa combination of bailing with-,a'' stainless steel _ bailer'to remove the major portion of f ne;grained sedirrientfrom inside the well;sur`ging to-flush or draw in sediment froXri tkie filter pack,and-additional ground'wate'r evacuation with a:Waterra- . ineAia'pump to fnislfthe.reirioval."of f,n grained sediment D.eyelopmental purging-activities-will ' :. .be"continued u til field* aram6ters 14 electrical-conductivi p {p N,and temperature}have stabilized and _ pu"rged water Js visually,sediment=free. Advaxced-GeoEnvironmentsl:Fnc:' - - _- _ ,.--