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Keenesburg Mine 2018 Vegetation Monitoring Report <br />one a cool season grass. None of the four species may comprise greater than 400 o relative cover <br />nor less than 3% relative cover. Vegetation species which may be used in the calculation of <br />species composition may be any plant species that is not defined as a noxious or prohibited plant <br />species and may be native or introduced. <br />3.1 2018 Revegetation Success Standards <br />The following standards were calculated for vegetation cover and herbaceous production using <br />the September 2017 through July 2018 precipitation (14.9 inches) in the permitted predictive <br />equations. <br />1. Vegetation Cover Standard = 37.3% (90% Standard = 33.6%) <br />2. Herbaceous Production Standard = 151.2 g/m2 (90% Standard =136.1 g/m2) <br />4 2017-2018 PRECIPITATION <br />The climate of the mine and surrounding area is typical of the region and characterized by cold <br />winters and hot, dry summers. CEC has collected local precipitation data at the mine since 1984; <br />however, only data from 1993 — 2018 is presented here to correspond with the duration of <br />vegetation monitoring (Appendix D). Average precipitation is generally lowest during the late <br />fall and winter (October through March) and peaks in April through June (Figure 7). <br />The Keenesburg Mine Reclamation Permit specifies the use of onsite precipitation from <br />September to July in calculating the vegetation cover and herbaceous production standards. Total <br />cumulative precipitation for the period from September 2017 - July 2018 was 14.9 inches. This <br />represents 124% of the average precipitation amount for the same period (1993-2017). The <br />pattern and timing of the precipitation was generally similar to the average; however, the peak <br />fell later than usual in June and was greater (Figure 7). <br />Figure 7: 2017-2018 Precipitation and Average Annual Precipitation <br />2017-2018 Precipitation <br />— — Average (1993-2017) <br />a <br />Sep Oct Nov Dec Jan Mar <br />Apr May Jun Jul Aug <br />Habitat Management, Inc. 11 October 2018 <br />