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property. There is hydraulic communication with two subirrigated fields in the Dry Creek drainage as <br /> well as flood irrigated fields in the Sage Creek drainage. A determination was made that any subirrigated <br /> sites are distant to the permit boundary lying some miles to the north. <br /> Phase 11 Bond Release <br /> o Specific topsoil replacement depth <br /> o Vegetative cover standard <br /> o Post-mining land use <br /> o Sedimentology estimates. <br /> The approved post mining land use for the lands applicable to SL6 is rangeland/wildlife habitat. The <br /> reclamation plan and the approved revegetation standards are designed to achieve the approved post <br /> mining land use. Livestock grazing has occurred on the sites reclaimed lands since 2007. Topsoil depth <br /> replacement information was included in the SL5 Phase II bond release application that was approved in <br /> 2014. <br /> Vegetation sampling was conducted by Cedar <br /> Creek Associates in 2015 and 2016 and, sampling <br /> results comprise Attachment D.Revegetation <br /> Success Supporting Documentation of the <br /> application. <br /> The Seneca II West Mine uses weighted average <br /> extended reference areas to evaluate vegetation <br /> reclamation success.The weighted average <br /> y reference area is a compilation of the major <br /> ` vegetation communities present prior to mining, <br /> v , <br /> y` ti with the current reference area sampling data <br /> 4 5k ,. •, proportionally added based upon the percentage <br /> l� R each community represented in the pre-mining <br /> r landscape.The extended reference area includes <br /> • k '` all undisturbed areas of a representative <br /> 1pv vegetative community that lies within the permit <br /> area,and outside of the disturbance area <br /> boundary. The main pre-mining communities <br /> were represented by Aspen (11% <br /> contribution), Mountain brush (35% <br /> contribution), Sagebrush (31% contribution),Steep Mountain Brush (13% contribution), and Western <br /> Wheatgrass/Alkali Sagebrush (10% contribution). The all-hit cover data is adjusted by elimination <br /> of woody plants, noxious weeds and cover of annual/biennial plants in excess of 10%relative cover to <br /> result in allowable all-hit herbaceous cover. <br /> Vegetative cover success is based on the allowable all hit herbaceous cover. Vegetative cover <br /> success on the reclaimed area will be no less than 90% of the cover success standard with a 90% <br /> confidence interval, in accordance with Rule 4.15.8(3)(a). <br /> Vegetation cover data was collected with systematically located transects with an optical point bar <br /> using a point-hit technique along 50 meter transects. A total of 100 data points along each transect were <br /> recorded. Transects were randomly located and oriented. For the BRB3,cover sampling required a <br /> Permit Number C1982057 Prepared by: R.Reilley NIS,GISP <br /> SL6 Phase II and III Page 6 of 16 <br />