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A <br /> i `l4 <br /> !I ! <br /> 4.3 Hydropunch" Sampling <br /> If ground water is encountered during drilling, an attempt will be made to collect a ground <br /> IR 1 <br /> water sample using a Hydropunch' sampling device. The Hydr j punch' sampling probe will <br /> f ;k <br /> be hydraulically advanced approximately 3 feet beneath the top of the water-bearing zone. <br /> The Hydropunchl probe will then be pulled back 4 feet to ex <br /> posi approximately 3 feet of <br /> screened interval within the water-bearing zone and approximately 1 foot of screened interval <br /> above the water-bearing zone. After the Hydropunch' probe is pulled back, approximately <br /> j 30 minutes will be allowed for ground water to accumulate A Bottom-filling stainless steel <br /> I or Teflon® bailer will be lowered into the Hydropunch' probe and a reconnaissance ground <br /> 1 water sample will be collected from near the top of the water surface. Water samples will be <br /> ' �p <br /> placed in laboratory supplied bottles containing the appropriate pl eservative, if applicable. <br /> The samples will then be labeled with a unique sample number, date, time of collection, <br /> initials of collector, Terranext project number and any other pertinent information. Each f <br /> water sample will be placed in an insulated chest containing ice and delivered (along with <br /> { chain-of-custody documentation) to Quanterra Environmental Services for analysis. <br /> 4.4 Borehole Abandonment Procedures <br /> t <br /> After each soil boring has been drilled and necessary samples ha e been collected, the soil <br /> boring will be abandoned. Borehole abandonment will consist of placing a cement/bentonite <br /> i <br /> grout through the center of the hollow-stem augers as they :are slowly raised to the surface. <br /> The grout mix will consist of approximately 2 pounds of powdered bentonite added to 6.5 to C <br /> 7 gallons of potable water and mixed with 94 pounds (one slack) b f cement. The bentonite <br /> will be added to the water and allowed to hydrate by circulating :the mixture using a grout <br /> pump or mixing apparatus. The cement will then be added l to the bentonite/water mixture <br /> and thoroughly mixed. The borings will be backfilled by placing the grout mixture through <br /> ,I <br /> 808-0O1.wkp/03-14-97/u/keydat&workp[an 10 <br /> .h <br /> 4 <br /> i <br />