Laserfiche WebLink
<br />Woodward.CIyde Consultants <br /> <br />" f' \~ 'J <br />~vOt... <br /> <br />For 54 tests on composited materials having permeability <br /> <br />rates of less than 10 feet/year, the average permeability value <br />was about 0.6 feet/year (6 x 10-7 cm/sec--very low <br /> <br />I <br /> <br />permeability). For the only 3 tests on composited materials <br />having permeability rates of greater tha~~feet/Year, the <br />permeability values were about 10 to 6jtfeet/year (very low to <br />low permeability). From our review o~~~ and test pit <br />logs it is apparent that the propo1sed Zone 2 ~~areas <br />, l' bl ' 1 . Ih 1 t' d <br />contaln extreme y varla e SOl JiWl~ respect to oca lon an <br />depth, and will have very low pe~~ab1~ity in the embankment. <br />The friction coefficient'<'T~~he cohesive strength at <br />optimum moisture, Co, and the saturat~ohesive strength, Cs, <br />which we assigned ztoonethe~a~~ are given in Table 2. <br />4. Filter-Drain ~ ~ ;I <br />Although not specificall~ described in Table 1, we were <br />I later informed th,a~~e .ervi~S~ilter-drain material, now <br />proposed,_ j.~ _ 'fo~1 ~rffes sed-ma'te.r4,a.l- -6€~u-r-eU-'from-Borrow-A"rea <br />-------'----~ Z ~/I f <br />A, apparently wtt materials ;rom Borrow Areas B, C, Land M <br />"- <br />also beincy-available. Tn'e processing is to remove the fine <br />fraction/'s~~\ than 5% will pass the 200 mesh screen. <br />The fi~~~eria)bJwere classified by the Bureau (Table 1) as <br />silty S~(SM1~itn 31% gravel and 69% sand, without an amount <br />of fines ind~b~~ After processing the classification will <br /> <br /> <br />. <br /> <br />I <br /> <br />be well graded sand-gravel and poorly graded sands (GW-SW-SP) <br /> <br />with an approximate dry density of 127 pcf at 70% relative <br /> <br />- 13 - <br /> <br />~ <br />~ <br />