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Union Ice Plant <br /> Phase I & II Remedial Investigation Plan <br /> Page: 3 <br /> 3.1 Drilling <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 .-t.he. .use-- of a hol.lo.w stem flight <br /> -_atu er -no less -thanT 3 1/4-inch i. d. and 8 7/8-inch o:cl-,, <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 /> Exploratory soil borings within the unsaturated zone <br /> will be backfilled with a concrete slurry mixture . <br /> Barings 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 />