|
Langston'sMarket, 15613 Pentis Vireel, Lathrop, Cahfoin.w • Decernher12, 1995
<br /> Phase 11 Lateral& Verne al L.vtent of Seconel Page: 4
<br /> IGrowidivaterAquifer fVorkFlo P;
<br /> Borings into the saturated zone w,ll be drilled to a maximum of 20 feet beneath the top of the
<br /> aquifer being explored If a deeper auifer is to be investigated, conductor casin r will first be (4L
<br /> grouted into place to sets', off'the upper aqu-fer and drilling will proceed tluough the conductor
<br /> casing aller the ,grout has been Vowed to set for 48 hours The two south wells should not
<br /> need conductor casing, as the adjacent borings SB-10 and MW-2 tested "ND"
<br /> Upon teinunatlon, the boring .nto the saturated zone will be completed as a monitonnl, well
<br /> and backfilled with concrete grout, after a Bentonite seal has been placed The boring for the
<br /> monitoring well will be of a diameter at least 4 inches greater tb an the 2 inch diameter of the
<br /> well casing to be used
<br /> The cuttings from the drilling, uperation -�Ntll be containerizcd or-site during diilling for proper
<br /> disposition The proper method of d sposal will be depet dent upon rest,`ts of laboratory
<br /> analysis
<br /> I32 Well Co nstrac'eon
<br /> All mates ials used in we€i ...ons' (-tio_i :viidl be thor0l.bhly cleaned pi-101 to introduction into the
<br /> boring A Bentonite or cement and Bentonite grout will be placed at the bottom of the boring
<br /> as necessary Aflei flit- se it h j� been alle.wed to set long erough to support the weight of the
<br /> casing, a 2- mch ehani.-Ici yVdl casing (stainless steel or PVC) with (,nd cap and Gt,toiy
<br /> perforations for plac-cn cat in tn,?sati,ratea zone (taking; int(, account seasonall variation) will be
<br /> placed in the bo iuig '1 l.(L .( , en aid filter pack sizes will be as noted in the well construction
<br /> drawing (h,grure 1) 1 be casincy and end caps will be threaded or joined by stainl_ss steel
<br /> screws, nc PVC coo-,•nr wi€i be used I lar. filter pack will extend two feet above the perforated
<br /> zone A Bentorrte ;eal two to three fe(;t thick will be placed in the annuli; space above the
<br /> filter pack followed by a current grout to the surface Seal and filter pack elevations may
<br /> change based on the underlying geology The wells will be su;ieyed by a state licensed
<br /> surveyor
<br /> 33 Pfeil Dei,elopment and Samiphng
<br /> The well will be developed until the well water appears clear of sediment, or until an
<br /> appropriate numbei o: .sell volumes (based upon the judgment of the responsible professional)
<br /> have been evacuated '1 lie .rater produces dosing well development will be containerized and
<br /> fleft on-site in 55-gallon Ali urns, or other suitable containers for disposal as hazardous waste if
<br /> deemed rteceEs:ry up,),i i e,eipt of laboratory results Disposal w ill he the responsibility of the
<br /> client unless -thee have been iide The wells will be allowed to stabilize for
<br /> twenty-foul (24) h')Lliz, I}..t+a to S'411h ljill
<br /> All soil acid gwwid w,,-,:r ampi, ,Nell he props ly dhc, wlleLted, project number,
<br /> sample coordinator, r,n.] LZmple i:ientific tion Field iL ,ui Is will document the above
<br /> informawn and Other signif,,,aiit d«ta, such aw names of o i sim peisoruie;i, s.1,11131ing methods
<br />
|