Laserfiche WebLink
These areas include sample Sites WC-1 through WC-5, WC-16 through WC-20, <br />WC-25 through WC-29, WC-31, WC-33, WC-35, WC-36, WC-42, and WC-45. <br />Peabody is closely monitoring the reestablishing vegetation in these <br />areas to document any contributing affects from spoil acidity. <br />Potential revegetation problems associated with high manganese levels at <br />Sites WC-25, WC-26, WC-27, WC-29, and WC-30 are also being investigated. <br />In addition, seven backhoe pits were excavated in September 1986 to <br />observe root penetration across the topsoil/spoil interface, test the <br />accuracy of the bucket auger sampling technique, and document any upward <br />migration of spoil acidity into the topsoil layer. These topsoil and <br />spoil test results should be available by January, 1987. Field <br />investigations will continue into the 1987 season to better delineate <br />the affected areas. <br />In summary, 1) acidic spoil is evident in areas where mixing and/or <br />selective handling have not been successful due to shallow overburden; <br />2) the A8P analysis rather than pH will be utilized during the 1986-1991 <br />permit term to predict long-term acidity; 3) selective dragline <br />` handling techniques (mixing, segregating/burying acid strata, and/or <br />segregating/topdressing with suitable material) will be monitored to <br />evaluate their effectiveness in eliminating unsuitable pH and ABP levels <br />at the regraded spoil surface; 4) mitigative measures to correct <br />potential acidity problems in recently regraded areas will include <br />either a two to three foot suitable overburden topdressing or the <br />incorporation of agricultural lime into the upper 12 to 24 inches of <br />acid spoil; 5) potential acid spoil spots and excessive h1n <br />concentrations in topsoiled and seeded reclamation areas will be more <br />accurately delineated and monitored during the 1987 field season. <br />Reclamation success will continue to be evaluated. Mitigative measures, <br />where necessary for these topsoiled and seeded reclamation areas, will <br />be developed and discussed with the Division; 6) revised and/or <br />additional Pages 6-29, 6-29a, 6-30, 6-30a, 6-33, 6-34, 6-145, 6-146, <br />6-146a, 6-151, 6-153, 6-153a, and 6-164 to Tab 6, SMP C-80-005, are <br />attached. <br />U <br />9 <br />