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a. <br /> INN <br /> union Ice Company, Union Street <br /> Phase 11 Reurerlial Work Plau <br /> Page 3 <br /> s - <br /> the use of a hollow stem flight auger no less than 4-114 inch i.d. and 8-M inch <br /> 0.d. <br /> All drilling equipment will be thoroughly steam cleaned before drilling begins to <br /> prevent the introduction of contamination from oft'site and between borings to <br /> prevent cross contamination. <br /> The boring will be logged (Figure 3)under the direct supervision of a registered <br /> engineering geologist using the Unified Soil Classification System. The color, <br /> texture, moisture, plasticity (if applicable), consistency of the earth materials, <br /> blow counts, pertinent soil or bedrock characteristics, and any evidence of <br /> contamination will be noted. All water-bearing zones and the depths at which <br /> they were encountered will be noted on these logs, <br /> i . <br /> All borings will be drilled in such it rrianner as to prevent cross contamination <br /> between strata. Exploratory soil borings within the unsaturated zone will be <br /> r backfilled with a concrete slurry mixture. Borings into the saturated zone will be <br /> drilled to a maximum of 20 feet beneath the top of the aquifer being explored. <br /> Any perching layers encountered will be investigated to a maximum thickness of <br /> five feet (5') and will be backfilled with concrete slurry, after a bentonite seal <br /> has been placed. If it deeper aquifer is to be investigated, conductor casing will <br /> first be grouted into place to seal off the upper aquifer(s) in series, if necessary, <br /> 3 and drilling will proceed through the conductor casing after the grout Inas been <br /> allowed to set properly. If evidence of contamination is noted during the <br /> drilling, the drilling will be halted until the responsible professional determines <br /> the advisability of deeper drilling. <br /> Upon termination, the boring into the saturated none will be completed as a <br /> monitoring well and backfilled with concrete grout, after a bentonite seal has <br /> been placed. The boring for the monitoring well will be of a diameter at least <br /> four inches (4") greater than the three inch (3") diameter of the well casing to <br /> be used, <br /> The cuttlllgs from the drilling operation will be containerized on. site during <br /> drilling for proper disposition. The proper method of disposal will be dependent <br /> upon results of laboratory analysis, This disposal will be the responsibility of <br /> the client unless arrangements have been made. <br /> 5.2 Welt Construction <br /> All ]Material used in well construction will be thoroughly cleaned prior to intro- <br /> __. duction into the boring.--A-bentonite or-cement-and bentonite-grout will-be --- ----- --- <br />