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29 Dccember 2000 <br /> AGF-NC Project No. 95-0114 <br /> Payc 7 o f 8 <br /> certified laboratory. Fach sample slcc�c ��ill be labeled %pith the buring location, sample depth. <br /> sample time. sampling date and sampler's initials. <br /> Duplicate samples .rill he ntonhored IN the presence of organic vapor using a photo-ionization <br /> detector (PID: "I'llernno Environmental 580A. 10.0 cV, calibrated to isobuhlcnc) and will he ,isually <br /> described on boring logs using the Unified Soil Classification System ([.LSCS). <br /> All sampling, tools and brass sleeves used for sample collection will be thorou�,hlr rinsed rrith clean <br /> water after washing with a solution ofAlconox. All hollow stern augers will be steam-cleaned prior <br /> to advancement of each borehole. <br /> 4.3. %'LLL COMPLETION <br /> The 8-inch soil pilot hoHngs will he completed as a ground water monitoring wells utilizing 2-inch <br /> diameter schedule 40 polyvinylchloride (PVC) 0.020-inch slotted well screen and blank; well casing. <br /> A 25-loot length of well screen is anticipated for installation of the extraction well from 20 feet to <br /> 45 feet bsg, A proposed monitoring well construchon dkgram is depicted ill I`igrure 3. <br /> The final 12-inch diameter pilot borings mill be singlc-cotnol?Wd as a 01-ourd water extraction well <br /> LOW, 4-inch diameter schedule 40 pohvinelchlo6de (PVC) 0M2O-inch slotted well screen and <br /> bfank well casing. A 25-moot length of well screen is anticipated for installation of the extraction <br /> well from 25 feet to 50 feet bsg,, A proposed extraction well construction diagram is depicted in <br /> 17'i11Ure 4. <br /> After installing the well casing in each pilot boring, a filter pack matn ial condsdng of even <br /> proportions ofprt-rvashed 411" Knestarsand and/or 3/8" gravct (large sand) will be added throLigli <br /> the augers over the screen interval to approximately two Let above the screened interval. Followin., <br /> placement of the filter peck. the well xWH he surged to assist sc€[ling the filter pack. Additional filter <br /> pack \rill he added if settling occurs. <br /> A notninal two-foot hentonite seal (pelf plug,-coded bentonite pellets) will he placed above the filter <br /> pack to minimize the potential for grout penetration into the screened section of the well. The <br /> bentonite seal will be formed by pouring bentonite pellets into the anmdar space bet"ven the wAl <br /> casing and the boring wall and allowing,them to settle on the filter pack. The; bentonite pellets "HI <br /> be allowed to hydrate for a nnininnum of one-halt hour prior to ,routing. <br /> I he rernAnin annular' space �v itk be filled to within one foot or the ground surface With a cement <br /> grout. Ile gnmt mixture will consist of Type [ 11 portland neat cement and not nioiv than 6gallons <br /> of.ratcr per 94-pound sack of cement. Ile ,rout will be placed by pEunping throu,,h trcn3mic pipe. <br /> A grouting inspection W be scheduled with Pk[S-LI Ili personnel, <br /> 4rhvmrrd Gecr6:nvirunrncnlxl.Enc. <br />