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1-91,October,2007 AGE-NC Project No. 95-0104 Page 4 of 6. .3.2. SOEL SAMPLING. Soil:samples will be collected in.selected borings for soil classification'beginning ata depth of 10 feet bs&utilizing a modified;Califv_rnia split-spoon sampler and brass sleev'es:The sampler will be dtiven by dropping it I 40-pound weight frrim a height of 30 inches(blow counts).The blow counts wilt-be.recarded. on boring fogs Pming sampling activities,, samples will-be monitored for the ice of orpr& vapor-using a photo-iooizehon detectot (FID::Thermo Environmental 580, 10:0 eV;cslibrat.ad to isobutylene)and will be visually described-on boring.log' using the Unified Soil Classification SyWrn(Uscs)- All Wiling-tools and brass.sleeves used:for sale'collection will be thoroughly rinsed with clean . water atter washing witha.solution of Alconox.-All:hollow'stem augers will be steam-cleaned prior to advancement in each borehole. 3.3. WELL CONIPLET'ION ITT soilbenngs.wili be single-completed as groundwater monitoring wells utilizing 2-inch diameter schedule 40 polyvinylchloride(PVC)0.0 04iich slotted well screen and blank well ca'sing,.Based on geckoelt ydrogeologic conditions,,a:20-foot Iengd .of well screen is-anticipated for installation of the monrtoringwells The scram will be' placed from 65 feet to 85. feet bog: A A 6posed well -.coris.irvKction diagram is depicted yin Figure 3. After,=nstalting:the well psi filter pack material.consisting of pre-washed C Lonestar sand will be adl>tri the screw interval.`to:approtafely two feet'above the screened interval. Fvllowugpla�t of t filter the well.will be surged t ass}st suing the filter pack: Adhttonal wind will be added if settling occurs, A:two-foot transition bye seal- (bentorpte chips) will be placed above the filter pack. to e the.p6te�a "fit:gtvut penetta#avn hto the-screened section of the gall.Tie Bentonite seal a _be foumed`by-povnft either b onito chips or pellets into the annulus and.allowing.them to seine on the filter.pack:Sintonift will hydrated using'approximately five gallons of tap:water. The bentonibee wlt be allowed to hydrate for a m nimulin of one-half hour,prior:to.grouting: T r-rem-ana space will'be-filled t4a the ground:surface with a cement grout, The: grout-t- MixtM.will consist-a&T-ype:VH portl=d°wd meat and not more Ihan,6 gaflons of water per- 94= ck of cemem:.The grout veil#be plaeed by pumping through- pipe.A grouting. will;bescheduled with-tiID personriei.~- .