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f <br /> TL 492-0181-01 Page 3 <br /> One undisturbed sample from each boring will be obtained in a <br /> shelby tube sampler. <br /> The auger will be removed from the boring and the groundwater <br /> depth will be measured. We estimate that the groundwater depth <br /> will be about 9 feet BSG. <br /> The borings will then be backfilled with bentonite chips <br /> (medium) to a minimum of 1 foot above the static groundwater depth. <br /> The chips will be poured loose into the boring from the top. <br /> The remaining open portion will be filled with neat cement. <br /> We anticipate that the cement will be furnished by Western Stone <br /> Products, and will consist of 5 to 10 gallons of water per sack of <br /> cement. Powder bentonite will be added to the mix on-site to <br /> achieve a bentonite content of 3 to 5 percent by dry weight of <br /> cement. The cement will then be poured down the borings from the <br /> top .,to complete the backfill operations. <br /> As an option, we propose to backfill with bentonite chips to <br /> the surface, then hydrate with water. The area will be excavated <br /> in the future for the proposed pipeline. The bentonite should seal <br /> the boring where neat cement may crack when disturbed by excavation <br /> i <br /> activities. <br /> These procedures were programmed to meet the minimum <br /> recommended drilling and backfill requirements for the San Joaquin <br /> County Public Health Services Environmental Health Division. If <br /> the described procedures are not in accordance with the accepted <br /> procedures, please contact us and we will ;,amend this document as <br /> needed. <br /> �ie a�oaaloued, ac. <br /> Fresno Modesto Visalia Bakersfield <br />