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XIII. Rule 4.13 Contemporaneous Reclamation <br /> Variances to contemporaneous reclamation were granted during mining operations for the <br /> backfilling and grading of Pit A and Pit B. The Backfilling and Grading section below describes <br /> this in more detail. <br /> XIV. Rule 4.14 Backfilling and Grading <br /> CEC requested additional time for backfilling and grading following coal removal from the <br /> contour strip mine. A detailed written analysis provided by CEC in accordance with Section <br /> 2.05.4(2)(c)has demonstrated that additional time was necessary. Therefore, the Division <br /> approved the additional time [4.14.1(1)]. A variance was granted on February 28, 1989 to allow <br /> for use of the A and B pits as ash and mine waste rock disposal sites (Technical Revision 20). <br /> Disposal of ash has been discontinued. <br /> The Division approved a minor modification of the general requirements of Rule 4.14.2 for <br /> reclamation of Pits A and B to approximate original contour to accommodate the disposal of ash <br /> and mine waste rock(PAP, Section 2.05.4, page 114). Slopes are slightly steeper to reduce <br /> infiltration to the buried ash. <br /> XV. Rule 4.15 Revegetation <br /> The approved revegetation plan emphasizes native species as illustrated in the seed mix on page <br /> 118. A sorghum mulch was approved as an optional means to meet soil stabilization <br /> requirements until vegetation is re-established(Rule 4.15.4). <br /> Approved methods to measure herbaceous cover,production, and species diversity are discussed <br /> in the PAP, Section 2.04.10. Reclamation success for vegetative cover and herbaceous <br /> productivity are determined using two approved equations that accounts for effective <br /> precipitation. These equations for reclamation success were derived from data collected on the <br /> Osgood reference area over a ten-year period. The Osgood reference area itself is no longer <br /> needed for comparison upon approval of TR-37 (PAP, Section 2.05.4). <br /> The reclamation success criteria for species composition are: <br /> o A minimum of four perennial species <br /> o A minimum of three warm season perennial grass species <br /> o For each species, a relative importance of no more than 40 percent or less than <br /> three percent <br /> For this permit,there is no density standard for woody plant reestablishment. <br /> To determine if these success criteria were met,vegetation monitoring must be conducted as <br /> described in Section 2.05.4. <br /> Keenesburg Strip Mine Page 14 <br /> October 2024 Findings for PR-03 <br />