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Herbaceous Productivitv <br />2005 Reclaimed Area Herbaceous Productivitv <br />The 2005 herbaceous production for the reclaimed area measured 71.09 grams/ !/2M 2 (1273.98 <br />lbs/acre). DRMS requested information regarding animal-unit-months (AUMs) and duration of <br />grazing from the landowner, but was unable to get an accurate usage value. Thirty 2 M2 quadrat <br />samples were collected in 2005. Sample adequacy calculations using the adequacy formula <br />referenced in the Division's Guideline Rezardinz Selected Coal Mine Bond Release Issues, dated <br />April 18, 1995, determined that the minimum number of samples (Nm;n) needed to achieve sample <br />adequacy was 64. Sample adequacy was not achieved for 2005 productivity data; therefore, the <br />reverse null formula was used for success comparison. <br />2005 Reference Area Herbaceous Productivity <br />The reference area was fenced and had not been grazed in either 2005 or 2006. Reference area <br />herbaceous production for 2005 was 39.15 grams/ %2 M2 (698.30 lbs/acre). Fifteen '/2M 2 quadrat <br />samples were collected in the reference area in 2005. Sample adequacy was achieved for the 2005 <br />reference area with thirteen samples. <br />2006 Reclaimed Area Herbaceous Productivitv <br />The 2006 herbaceous Production for the reclamation area measured 40.87 grams/ %2 M2 (728.97 <br />lbs/acre). Thirty'/2 M quadrat samples were collected in 2006. Sample adequacy calculations using <br />the adequacy formula referenced in the Division's Guideline Regardinz Selected Coal Mine Bond <br />Release Issues, dated April 18, 1995, determined that the minimum number of samples (Nmi„) <br />needed to achieve sample adequacy was 13. Sample adequacy was achieved for the 2006 <br />productivity data. <br />2006 Reference Area Herbaceous Productivitv <br />The reference area was fenced and had not been grazed in either 2005 or 2006. Reference area <br />herbaceous production in 2006 was 54.14 grams/ %2 M2 (962.78 lbs/acre). Fifteen %2 M2 quadrat <br />samples were collected in the reference area during 2006. Sample adequacy was achieved for the <br />2006 reference area with thirteen samples. <br />Herbaceous Productivity Conclusions <br />Pre-mining herbaceous ?roduction for the reference area, and the area to be disturbed by mining <br />measured 49.35 g/'/2 M (880 lbs/acre). The 2005 reclaimed area herbaceous production of 71.09 <br />grams per %2 M2 (1273.98 lbs/acre) and 2006 reclaimed area herbaceous production of 40.87 grams <br />per %2 M2 (728.97 lbs/acre) average 55.98 grams per %2 M2 (1001.48 lbs/acre) of forage after <br />livestock grazing had occurred. The average herbaceous production on the grazed reclamation in <br />2005 and 2006 exceeds that measured on the reference area and the pre-mining area. The <br />productivity on the reclaimed area is deemed successful. <br />Grassy Gap TOJ 6/5/2009 13