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J-7 <br /> "TTEWWe answer to you. <br /> 110 North Rubey Drive,Suite 201,Golden,CO 80403-24539 Phone:(800)738-8395 Engineers <br /> E-mail:rettew@rettew.com•Web site:rettew.com <br /> Environmental <br /> October 17,2019 Consultants <br /> Surveyors <br /> Mr.Timothy McCarthy Landscape <br /> Architects <br /> Schedio Group LLC <br /> 808 91h Street,Suite A Safety <br /> Greeley,CO 80631 Consultants <br /> RE: Colorado State Permit 112,Section 6.4.10 <br /> Exhibit J—Vegetation Information <br /> Keenesburg Project, Guttersen Ranches, LLC <br /> Weld County,Colorado <br /> RETTEW Project No. 114782003 <br /> Dear Mr.McCarthy: <br /> RETTEW Associates,Inc.(RETTEW)is pleased to provide the following information to meet the compliance <br /> requirements for Colorado Division of Reclamation, Mining, Safety (DRMS) Permit 112 Section 6.4.10 <br /> Exhibit — J Vegetation Information for the Keenesburg Mine No. 2 project. Keenesburg Mine No. 2 is an <br /> approximately 3,200-acre proposed sand mine facility on property owned by Guttersen Ranches, LLC in Weld <br /> County,Colorado(Site).Information in this letter presents the relationship of present vegetation types to soil <br /> types,estimates of average annual production for croplands,and the estimated carrying capacity for the Site.This <br /> information is provided to meet regulatory requirements to establish a baseline for reclamation efforts.Enclosed <br /> with this letter are: <br /> • Figure 1—Rangeland Production Map <br /> • Attachment A—Stocking Rate Calculations <br /> • Attachment B—References. <br /> Methods <br /> Information for descriptions of present vegetation types were attained by utilizing an environmental <br /> resource report for the Keenesburg Project conducted by RETTEW (2019).The relationship of vegetation <br /> and soil was determined using Natural Resources Conservation Service(NRCS)United States Department of <br /> Agriculture(USDA)web soil survey estimates for vegetation production based on the soil type present at <br /> the Site (Table 1). Estimates of annual production and carrying capacity were calculated utilizing various <br /> grazing studies and NRCS-USDA web soil survey to obtain the results below.Animal Unit Equivalents(AUE) <br /> are standard numbers used to represent animal weights. RETTEW utilized the standard of one <br /> 1,000-pound cow equal to 1 AUE and one 1,400 cow-calf pair equal to 1.4 AUE. When calculating total <br /> available forage production,a harvest efficiency of 50 percent is used with the assumption that 25 percent <br /> of the forage supply is wasted by the animal and the other 25 percent of the forage supply is trampled or <br /> damaged.Table 1 summarizes the estimated vegetation production of the Site based on present soil types <br /> during a normal year. <br /> too <br /> Keenesburg No. 2 Mine_112 Reclamation Operation—November 22, 2019 <br />