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~• 5. The topsoil replacement depth will be closely observed and <br />routinely inspected. Topsoil depth measurements will be recorded <br />on a 300 foot sample grid. Comparisons will continue to be made <br />between the projected and actual topsoil replacement depths in <br />order to verify topsoil salvage depths. <br />(i. An annual topsoil balance will be completed for the life-of-mine <br />operation. <br />7. Shallow postmine soil pits will routinely be excavated near <br />revegetation monitoring sites to determine plant rooting depths, <br />test and evaluate the topsoil/spoil fertility and compare <br />topsoil/spoil profile data with site specific revegetation data. <br />The minimum fertiltiy analyses will include pH, particle size, <br />organic matter, total nitrogen, and phosphorus. <br />Conclusions <br />~• Topsoil balance figures for the life-of-mine operation at Seneca show <br />that 12 inches of topsoil will be available for replacement. Current <br />literature and on-site data show that 6 to 15 inches of topsoil <br />underlain with chemically and physically suitable spoil material will be <br />sufficient to 1) establish a proper seedbed and rooting medium and 2) <br />achieve a compatible relationship between production, diversity and <br />plant community composition. A topsoil resource quality control program <br />will remain in effect over this 5 year permit term to 1) ensure that <br />topsoil is salvaged and replaced as recommended, Z) evaluate topsoil and <br />spoil handling-procedures and 3) monitor long term revegetation success. <br />An annual sail balance will be completed through the life-of-mine <br />operation. <br />9-dl Revised 8/17/90 <br />• <br />