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sack Type I Portland cement with 4 1/2 to 8 gallons of potable water and <br />' up to 4% by volume of powered Ca-nch montmorillonite clay bentonite <br /> The procedures for installing the conductor casing is as follows <br /> ■ Drill a 16-inch diameter boring to the desired depth <br /> ■ Drive a 12-inch diameter casing at least 3 feet into the clay <br /> ■ Grout will be emplaced. b tremae methods until returns are <br /> a y <br /> observed on the surface between the casing and the boring <br /> ■ Grout will be allowed to cure for a minimum of 72 hours <br /> ■ Conductor casing will be cut flush with the ground surface <br /> ■ A 8-inch hollow-stem auger drill ng will ream the inner portion of <br /> the conductor casing to the desired depth <br /> The procedures for installing the PVC casing are as follows <br /> e Assemble a flat threaded end cap, screen and blank sections as the <br /> liewell casing is lowered into the hollow-stern <br /> E Tremae the sand filter around the casing while removing the <br /> augers <br /> ■ Check the sand level with weighted tape measure <br /> ■ Place the bentonite pellets by calculated volume and recheck the <br /> pellet level with the weighted tape measure <br /> ■ Wait 30 minutes while the bentonite pellets start to expand <br /> N Tremie the seal (cement/bentonite) while removing the hollow- <br /> stem augers <br /> ■ Set surface protective casing Cement and finish concrete apron <br /> S Set traffic barriers in concrete if needed <br />' Following installation of the monitoring wells, each well will be developed <br /> using swabbing, bailing and pumping techniques Immediately following <br /> well development, groundwater samples will be collected and submitted <br />' to a certified laboratory for analyses Prior to groundwater sampling, the <br /> water within the well casing is purged so that formation water can enter <br />' 3-6 <br /> COMPANY CONFIDENTIAL TRADE SECRET AND PROPRIETARY INFORMATION OF THE MARK GROUP INC 111 r <br />