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biodegradable material specifically designed for use as a drilling fluid. Such <br /> material shall be approved by the Engineer prior to use. The mud shall be <br /> designed to remove cuttings and support the walls of the bore. The volume <br /> of the sand separation pit shall be at least three times the calculated volume <br /> of the completed bore hole. <br /> B. If use of a drilling fluid additive is determined to be necessary and its use is <br /> approved by the Engineer, a mud monitoring program shall be developed by <br /> the Contractor's drill fluids engineer and followed by the Contractor. <br /> C. The Contractor shall consult a qualified drill fluid engineer regarding the <br /> proposed drill fluid program. The fluid program and the fluid monitoring <br /> program shall be approved by the Engineer prior to the beginning of drilling. <br /> 2.04 SANITARY SEAL GROUT (GROUT BACKFILL) <br /> A. Grout Mix: The grout shall be proportioned of 1 part cement, 1-112 parts <br /> sand, and water not to exceed 6 gallons per sack of cement. <br /> 1. Portland cement shall conform to ASTM 150, Type I or Type1r I1_ <br /> 2. Sand shall be free from clay, earth or other deleterious matter and shall <br /> { be sharp and clean. It shall be evenly graded as follows: <br /> Passing Sieve Percent by Weight <br /> No. 4 95-100 <br /> 15 35-75 <br /> 50 10-25 <br /> 100 2-8 <br /> 3. Grout Backfill: Grout backfill for the sanitary seal shall be installed in the <br /> annular space between the well casing and the well bore in the area <br /> between the top of the well and 100 feet below the ground surface. <br /> 2.05 ( ,§VEL PACK C <br /> A. Mix Design: The gravel pack mix design to be used in the annular space <br /> between the well casing and the bore hole as shown on the drawing shall be ' <br /> in accordance with AWWA Standard A100, Section 4.6 and shall be a round, <br /> durable gravel supplied by a manufacturer normally engaged in the <br /> manufacturer of water well gravel packs. Gravel pack size shall be <br /> determined after a sieve analysis of each water bearing strata; the selected <br /> gravel pack shall have a 70% —retention point on a sieve analysis curve <br /> between 4 to 6 times greater than the 70% retention point on a sieve analysis <br /> curve of the finest formation found in the well hole. <br /> B. Under no circumstances shall crushed rock be used for gravel pack mix. <br /> Division III- 18 i <br />