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Revised 1/11/80 <br />Section 816.46(a) Continued <br />sand and silt, which would be in the range of 40 to 95 lbs/ft3. 80 <br />lbs/ft3 was used by LRCWE; this is in the range of what the actual <br />value will be. However, no site specific data are available. <br />Discussion of the VM (CP) factors used will be found in the re- <br />sponse to question 8 of this section. <br />The VM factor was used by LRCiaE in the LISLE sediment calculations <br />in lieu of the C and P factors. C and P factors aze related to <br />crop and agricultural practices, while VM is related to vegetation <br />and mechanical practices, which is more appropriate for reclamation <br />of surface mines. <br />The VM factors which were used by LRCWE came fran a reference <br />provided us by EFC (See p. 11 of F~chibit 13). The National Cooper- <br />ative Highway Research Program, in 1976, reported VP7 factors which <br />range from 1.30 for bare soil crn~acted by bulldozer to 0.01 for <br />pern~anently seeded azeas after 12 months. <br />LRCWE assigned a value of 0.05 for undisturbed azeas and areas <br />which had been reclaimed for longer than 12 months. From the <br />attached reference, which reports the 1976 VM factors as C9 fac- <br />tors, this corresponds to seeded areas from 2 to 12 months, and is <br />conservative beyond that. A value of 0.40 was used for azeas in <br />Exhibit 8p 816-95('.) 12/13/99 <br />