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.�r r 4_.. -r _ til' --� - .Y J l 4 Y -T — -^- a y "t . - T •.S: _rt _15 June 1999, T_ AGE-NC Project No. 98 053,4 t - 'r.,Page 10 of 13 -°Soil cuttings generated during drilling.of the soil borings will be containedwithin plastic sheeting LLon the,site for storage. Drums containing decontamination water-and-soil cutting will be stored on-- tv '2 . site-pending:appropriate removal;disposal and/or treatment ': = 4.2.2. Monitoring Well.Installation ,n = - ., - _ -The monitoring well boring will be co mpleted using hollow-stem.auger drilling techniques. Soil „ 3 -_ borings will.be advanced! sing a truck-mounted`drill rig'equI' d with fiollow-stem augers'. The pilot boring for groundwater'"monitoringwells-will'be advanced utilizing 8.25-inch augers. _' . Proposed monitoring well_design is illustrated in Figure 3._ Following completion-of the.soil.borings for monitoring wells a 2-inch-diameter Schedule 40 PVC' 4, 0.02-inch slotted-well screen and;casing will be installed. A 20-foot section of well screen will.be installed from a depth of aP'proximately.10 feet to 30 feetbs : r The casing,filter pack and-well sealing materials wilt be placed_into the borehole.through the,interxor' - - of the hollow-stem augers: _ - - 1 _ After.installing the well casing, filter pack-material consisting.of pre-washed 0 Lonestar:sand will: -_ be added from the bottom;of the borehole to approximatelyawo.feet above the lower'screened interval. Following placement ofthe'filter.pack,..the well will be surged to assist iri:settling the(Iter- { ' pack.:Additional sand will be added if settling occurs:A nominal one-foo# bentonite seal will lie ' placed above the filter°pack. Bentonite-chips w_ill,be`hydrated'.be hydrated using five gallons of . potable-water: ' _ - - _ . . 4. The remaining annular spaces will be filled to.the ground surface with a cement'gro' The grout „ -mixture-will consist of Type I/II portland_neat-cdment:and not more`than 10 gallons of water per. ' - 94-pound.sack of cement._The grout will be placed bypumping'through tremmie-pipe.,Grouting procedures-will be inspected by PHS-EHD.personnel. A_traffic-rated well box will be installed.over. " .. 14 the wells, in-accordancd with.County regulafioris. y r•. r= :' z _": Following completion ofthe monitoring wells,well.elevations and locations will be surveyed by -AGE-personnel, relative to monitoring well MW-1 T - -.4.3. -_GROUNDWATER.SAMPLING.PROCEDURES L ' Groundwater.sample collection will lie performed in accordance with pertinent applicable sampling } F *. AdwncedOioEdvironmental Inc. j