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Sec. 10-1, Construction Details <br /> Std. Spec.Sec 13 <br /> Special <br /> Page 2 of 9 <br /> E. Probe Pipe End Cap <br /> Probe pipe end cap shall be schedule 40 PVC. <br /> F. Probe Pipe Weight <br /> Probe pipe weight shall be minimum 20 lbs. Two (2) No. 10 reinforcement bars <br /> cut in 2-foot lengths, or equivalent, shall be used as probe pipe weight. <br /> ' 2.02 BACKFILL MATERIALS <br /> A. Pea Gravel <br /> Pea Gravel shall: <br /> 1. Consist of rounded to subangular material from a natural source <br /> (not crushed). <br /> 2. Contain no limestone. <br /> 3. Have maximum particle size of 3/8-inch. <br /> 4. Contain 50 to 90 percent by weight passing the No. 4 Sieve. <br /> 5. Contain less than 3 percent by weight passing the No. 200 Sieve. <br /> B. Bentonite <br /> Bentonite shall be premium grade sodium bentonite clay, 8 mesh granules, <br /> Benseal, or approved equivalent. <br /> C. Neat Cement <br /> Neat cement seal shall consist of a mixture of Portland cement with not more than <br /> seven gallons of clean water per sack (one cubic foot or 94 pounds) of cement. <br /> Neat cement mix shall also contain 5 percent bentonite. <br /> D. Concrete <br /> Concrete shall comply with ASTM C85, or Ready-Mixed concrete complying with <br /> ASTM C94. <br />