2012-07-25_GENERAL DOCUMENTS - C1981019

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Permit Page 4.15-16 states that the “…herbaceous cover of the revegetated area will be considered adequate for final bond release if it is not less than 90% of the herbaceous cover as determined from the reference areas with a 90% statistical confidence utilizing a standard student’s statistical t-test comparison of the means.” The reclamation blocks contained in SL-05 were sampled in 2007, 2008 and 2009 in accordance with the vegetation monitoring plan, detailed on Permit Page 4.15-1. Sample adequacy was determined using the Cochran formula. Both the sampling plan and the sample adequacy determination are acceptable to the Division. Bond Release Block 79-95 Year 1 (2007 Sampling) Cover: BRB79-95: herbaceous cover = 67.8 % Acreage weighted reference area: Herbaceous cover =47.1% The 2007 sample data from BRB 79-95 exceeds 90% of the herbaceous cover in the BRB 79- acreage weighted value for the mountain shrub and sagebrush reference areas. st 95 is successful for herbaceous cover for 2007 (1 year sampling). Productivity: BRB79-95: Herbaceous production: 1803.4 lbs/acre Acreage weighted reference area: 661.5 lbs/acre The 2007 sample data from BRB 79-95 exceeds 90% of the herbaceous production in the acreage weighted value for the mountain shrub and sagebrush reference areas. st BRB 79-95 is successful for productivity for 2007 (1 year sampling). Diversity: Seven perennial grass species were encountered during the 2007 sampling for BRB 79-95. Two species of perennial forbs contributed between 1% to 50% relative cover. This exceeds the requirement for a minimum of at least two cool season grasses with between 3% and 50% relative cover, and all forbs combined with BRB 79-95 exceeded the reclamation between 1% and 50% relative cover. success diversity standard for 2007. Bond Release Block 79-95 Year 2 (2008 Sampling): Cover: BRB79-95: herbaceous cover = 66.5 % Acreage weighted reference area: Herbaceous cover =45.9% The 2008 sample data from BRB 79-95 exceeds 90% of the herbaceous cover in the BRB 79- acreage weighted value for the mountain shrub and sagebrush reference areas. nd 95 is successful for herbaceous cover for 2008 (2 year sampling). Productivity: BRB79-95: Herbaceous production: 1936.2 lbs/acre Acreage weighted reference area: 594.51 lbs/acre The 2008 sample data from BRB 79-95 exceeds 90% of the herbaceous production in the acreage weighted value for the mountain shrub and sagebrush reference area Proposed Decision and Findings of Compliance 25 July 2012 Partial Phase III Bond Release Sl-05 Page 10