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rµ , <br /> Mil <br /> W11F Environmental Consultants, Inc. <br /> Sampling ProtoC.o! <br /> Drilling <br /> Permits will be obtained as necessary for all wells (including borings) before <br /> drilling begins. The soil boring will be accomplished using a mobile mounted <br /> drilling rig employing the use of a hollow stem flight auger no less than 6 314- <br /> inch i.d. and 10 718-inch o.d. <br /> All drilling equipment will be thoroughly steam-cleaned before drilling begins, <br /> to prevent the introduction of contamination from off site, and between borings <br /> to prevent cross contamination. <br /> The borings will be logged) 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 /> fail bgrings will be drilled in such a manner as to prevent cross contamination <br /> r between strata. Exploratory soil borings within the unsaturated zone will be <br /> backfilled with a concrete slurry mixture. <br /> Borings into the saturated zone will be drilled to a maximum of 20 feet beneath <br /> the top of the aquifer being explored. Any perching layers encountered will be <br /> investigated to a maximum thickness <br /> seal has been placcdl b <br /> e backfilled with <br /> concrete slurry, after a bentonitef a deeper aquifer is to <br /> be investigated, conductor casing will first be grouted into place to seal off the <br /> upper aquifer(s), in series, if necessary, and drilling will proceed through the <br /> conductor casing after the grout has been allowed to set properly. If evidence <br /> of contamination is noted during the drilling, the drilling will be halted until the <br /> responsible professional determines the advisability of deeper drilling. <br /> Upon termination, the boring into the saturated zone will be completed as a <br /> monitoring well and backfilled with ce c-rc oe grout, after a bentonite seal has <br /> been placed. The boring for the monitoring well will be of a diameter at least 6 <br /> inches greater than the 4 inch-diameter of-tile well casing <br />