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-4- ~~ Federal Lease D-047201 T.2rt., R.lOW. bih pm Sec. 3: S 1/2 SE 1!4 Sec. L0: NE 1/4 t.c 1/4 Federal Lease C-023703 T.2N., R.lOW., 6th pm Sec. 3: E 1/2 SE 1/4 SW 114 17. Upon approval of Departmental action [lie operator will submit within 30 days plans for construction of powerlines using approved guidelines for raptor protection. 18. Upon approval of Departmental action the operator within 30 days c.•ill cocmmit to not using persistent pesticides unless approved by the regulatory authority and [o fence any ponds that contain toxic materials. 19. With respect to vegetation resampling in the 1981 field season, site 50 (Colorado {Jildrye) and its reference area will be sampled for herbaceous cover and production. Site 60 (Juniper) will be sampled for shrub density and for _ production. Site 41 (Sagebrush-Grass) and site 40 (Greasewood-Sagebrush) and corresponding reference sites will be sampled for production. Data summaries and statistical analyses must be submitted to the regulatory authority by October 1, 1981.• This shall apply for all sampling conducted during 1981. ~i• 20. With respect to vegetation sampling during [he 1981 field season in areas to be disturbed by refuse disposal units 1-4, tiie number of sample clusters within each vegetation type shall be as specified on page 24-7 of Illustration 24. Corresponding reference areas must also be sampled for applicable parameters. The size and location of proposed reference sites must be submitted to the regulatory authority within 30 days of approval. The reference area which will represent the area presently occupied by the Cheatgrass-Annual Forb community must be specified. 21. Disturbed acreages of each vegetation mentioned on page 24-8 shall be calculated authority within 30 days of approval. The will be set by the regulator}• authority at size and location of proposed reference si above deadline. type affected by the sites and submitted to the regulatory number of sample clusters requited the time. A map indicating the tes shall also be submitted by :tie 22. With respect to evaluation of species diversity nn reclaimed lands, Western Fuels is required to work with the rcl;ulatory authority towards the establishment of mutually acceptable success criteria. Such criteria must be formulated and agreed to no later than January 1, 198?. Section F on page V-Sla shall be revised accordingl}•. Willi respect to the use of reference areas and range site descriptions in determination of re vegetation success, the procedures outlined in cowmen[ 5 of the April 20, 1981 letter to Western F els are to be followed. Reference areas in poor condition are to be fenced. If a condition check at the time of bond release indicates that [he reference area is still in poor condition,