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instrument error and maximize precision and observer accuracy. Cover transects will be a <br />minimum of 25 meters in length, with two sample data points collected at 1.0 meter intervals <br />along the transect on opposite sides of the transect centerline, 1.5m apart. Transect direction <br />will be established randomly through the use of computer generated random directions (0- <br />360°). In no event will transects be allowed to extend within ten feet of reference area or <br />revegetated area boundaries to minimize impacts from "edge effect." <br />For statistical purposes, each cover transect (comprising 50 data points) serves as a sample <br />unit. Data points recorded the first vertical "hit" on vegetation (above or below the <br />instrument), and any cryptogamic crust. Subsequent "hits" on vegetation (prior to <br />interception of the ground) will be recorded. Cover data are recorded and reported by <br />individual plant species. The first interception is used to calculate total vegetation cover <br />values. Additional interceptions area used to calculate relative cover of individual plant <br />species and lifeforms. <br />Revegetation will be deemed successful for the success criterion of total vegetation cover if <br />the value of the sample mean from the reclaimed area is equal to or greater than 90 percent <br />of the value of the final revegetation success criterion for total vegetation cover with 90% <br />statistical confidence. <br />2.9.6 METHOD FOR SAMPLING MIXED PRE- & POST-SMCRA INDUSTRIAL <br />COMMERCIAL RECLAIMED AREAS (CATEGORY F) <br />In re -disturbed pre-SMCRA reclaimed areas that have an industrial/commercial post -mining <br />land use, revegetation sampling to determine reclamation success will not be necessary as <br />these areas will not be revegetated per the surface landowner's request. <br />2.9.7 METHODS FOR SAMPLING POST-SMCRA, UNDEVELOPED LAND RECLAIMED <br />AREAS, USING A REFERENCE AREA (CATEGORY G) <br />Sampling methods described below apply to both reference area(s) (where employed) and <br />reclaimed areas. <br />2.9.7.1 SAMPLING DESIGN <br />Reference Areas <br />Based on the location of reclaimed areas to be evaluated for bond release, one or more of the <br />applicable approved reference areas will be quantitatively sampled during the same season as <br />the reclaimed areas. <br />Sample locations within each eligible reclaimed area will be randomly determined by use of a <br />100'x100' grid overlaying the reference area. Sample points within the reference area will be <br />selected using a random numbers table. Sample point locations will be located in the field <br />through compass triangulation, GPS, and pacing from known landmarks. <br />TR -77 H-19 Revised March 2019 <br />