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Union Ice Plant <br /> Phase I & II Remedial Investigation Plan <br /> Page: 3 <br /> 3.i DrIJOLing <br /> Permits will be obtained as necessary for all wells <br /> (including borings) before drilling begins. The soil <br /> boring will be accomplished using a mobile mounted <br /> drilling rig employing the use of a hollow stem flight <br /> auger no less than 3 1/4-inch i.d. and 8 7/8-inch o.d. <br /> All drilling equipment will be thoroughly steam <br /> cleaned before drilling begins to prevent the <br /> introduction of contamination from off site and <br /> between borings to prevent cross contamination. <br /> The borings will be logged (Figure 5) under the direct <br /> ® supervision of a registered engineering geologist <br /> using the United Soil Classification System. The <br /> color, texture, moisture, plasticity (if applicable), <br /> consistency of the earth materials, blow counts, <br /> pertinent soil or bedrock characteristics, and any <br /> evidence of contamination will be noted. All water- <br /> bearing zones and the depths at which they were <br /> encountered will be noted on these logs. <br /> All borings will be drilled in such a manner as to <br /> prevent cross contamination between strata. <br /> Explithin <br /> willobetory soil backfilledowithsawconcreteeunsaturated <br /> slurry mixture. <br /> Borings into the saturated zone will be drilled to a <br /> maximum of 20 feet beneath the top of the aquifer <br /> being explored. Any perching layers encountered will <br /> be investigated to a maximum thickness of 5 feet and <br /> will be backfilled with concrete slurry, after a <br /> bentonite seal has been placed. If a deeper aquifer <br /> is to be investigated, conductor casing will first be <br /> grouted into place to seal off the upper aquifer(s), <br /> in series if necessary and drilling will proceed <br /> through the conductor casing after the grout has been <br /> allowed to set properly. If evidence of contamination <br /> is noted during the drilling, the drilling will be <br /> halted until the responsible professional determines <br /> the advisability of deeper drilling. <br /> Upon termination, the boring into the saturated zone <br /> will be completed as monitoring wells and backfilled <br />