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e <br /> 2.06 CONCRETE SURFACE SEAL <br /> A. The concrete surface seal shall consist of a mixture of Portland cement, sand, <br /> coarse aggregate and clean water in the proportion of at least five sacks of cement <br /> per cubic yard of concrete, with no more than seven gallons of water per sack of <br /> cement. <br /> PART 3 -EXECUTION <br /> 3.01 GENERAL <br /> A. The boreholes shall be drilled as an exploratory boring to determine the groundwater <br /> level, and investigate the nature of the subsurface strata. The exploratory boreholes <br /> may be drilled by hollow stem auger methods. Split spoon samples shall be <br /> collected on 5-foot centers for geologic logging purposes. <br /> B. The depth of the boreholes could be 120 feet deep or no more than 15 feet below <br /> where the shallow groundwater is encountered. The actual depth shall be <br /> determined in the field,based on where the water deep level is encountered. <br /> 3.02 DRILLING <br /> A. The Contractor shall decontaminate the drilling rig and all drilling equipment <br /> before drilling and monitoring well installation. The Contractor shall clear the <br /> boring location of all brush and minor obstructions. <br /> B. The Contractor shall collect split spoon samples on 5-foot intervals for the on-site <br /> geologist. The Contractor shall record on the Driller's Log all water bearing <br /> zones, and zones or depths exhibiting drilling problems that may affect the well <br /> installation. <br /> C. At total depth, the Contractor shall remove soil cuttings prior to construction of <br /> the well. The Contractor shall measure the total depth of the completed borehole <br /> using a weighted sounding line. The borehole depth is to be checked by the <br /> Contractor to assure that formation material has not heaved, or that caved-ins <br /> have not entered the borehole. If heaving or cave-ins have taken place, the <br /> Contractor shall clean out or re-drill the borehole before well installation. <br /> D. In the event that the borehole was over-drilled, the bottom of the hole shall be <br /> grouted with neat cement, bentonite pellets, or bentonite chips to raise the bottom <br /> of the hole. <br /> 3.03 WELL INSTALLATION <br /> Corral Hollow EMP WP.DOC Page 4 of 8 February 28,2007 <br />