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surf ace Seal <br />a cement - <br />."he remaining annualar space was sealed with <br />bentonite grout. The grout was mixed in a 55 gallon dram, <br />using arproximately 26 Gallons cf water, 18 pounds bentonite <br />powder, and Soo pounds neat cement. hater from the on-site <br />groundwater well was used in the grout. The dram was filled <br />approximately half full with the 26 gallons of water. The <br />water was circulated from the drum, through a hose to the <br />pump on <br />the drill rig, and back into the drum through a hose <br />with a cons,,-,, tip that created a spray. T <br />the bentonite <br />powder was poured onto the spray to pre -hydrate the <br />bentonite while the pump continued to circulate the mixture. <br />_Then -the cement was poured into the drum, and allowed to <br />circulate - vital the water- and- bentonite . _until the _Grout <br />mixture was free of all lumps. <br />The augers were removed before the grout seal was installed. <br />The `®envie pipe was lowered into the well to within 5 feet <br />of the bentonite seal, and the grout was pumped through the <br />trerie pipe until the entire annular space was filled. <br />T.e7l Protection <br />%ro7 cap covers the top of the casings, and a locking vault <br />was set in concrete to protect the well fr= unauthcr:.ze3 <br />access. A Christy box with a metal lid was set in concrete <br />over the vault, a few inches above the grvand surface to <br />prevent ponding of water above the well. The Christy boxes <br />are water -tight to prevent surface water entering the well - <br />,q <br />ell. <br />ng well pevelc^n►ent <br />n Aur st <br />The crop.:. dwater monitoring wells were developed ... <br />and Se_te:�er, 1987 fcr Sclid waste Fssessment Test <br />by -,•r w®th a <br />_sa.....®...ne • Deve..o✓:..es... free <br />cs�t®Ve c:.sp :°` er =p uns-lythe water was <br />D ".a ems ,....�a..a p <br />of s': spe=dea fines. Gro: ^.awater levels `..he well hz%: <br />Cropped substant4a!ly, and only the lower several feet cf <br />the filter pack were developed by pumping. The wells w- <br />arbe developed d.:ring the winter by mechical surging us :.n-- a <br />vented surge block after the water table has risen ^�. <br />riell <br />development will be started slowly, and increased g_adua...Y <br />as development proceeds. Surging will proceed from the top <br />to the bottom of the screed., with a stroke length no greater <br />into the well dur -ng <br />than three feet. NaaterI.al Brough`` <br />sur;ing will be perioical'_y bailed. <br />I <br />