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hillside approximately '/4 mile south and 300 feet (vertically) below. Observation and inspection <br />of the upper facilities provided no concern with regard to surface runoff at that location. The <br />upper site consists generally of collection and sedimentation ponds for groundwater pumped <br />from the JD -9 Mine below. These ponds were constructed by excavation and placement of the <br />embankment materials around the edges, putting the top -of -bank elevations above the <br />surrounding ground surface. Offsite surface runoff generated in the area is therefore diverted <br />around the ponds. Onsite precipitation is collected within the ponds which are designed to flow <br />from one to another by gravity and are designed with several inches of freeboard above the <br />discharge piping to the next pond. The site is located in a relatively flat area of Monogram Mesa <br />in sandy soil with no significant natural drainage channels crossing the area. No evidence of <br />erosion or runoff concern was observed at this upper site; therefore it is not a part of this <br />drainage analysis. <br />At the main facility below, a large waste rock pile extends from the hillside to a lower bench area <br />and is bordered on the west side by a large channel that drains the highland area to the north, <br />including a portion of Monogram Mesa. Runoff from the site and the highlands above the mine <br />drains south into Bull Canyon. This lower facility is the subject of this drainage analysis. <br />4.0 Site Description <br />4.1 Operations Structures <br />JD -9 is a designated mining operation. Uranium and vanadium minerals will be mined <br />underground producing ore, which will temporarily be stored on the surface while awaiting <br />transport to a processing facility, and waste rock that may at least partially be stored on the <br />surface (some may also remain in the mine). <br />Once mining resumes, the waste rock stockpile will be the major feature of the site. During this <br />time, it is anticipated that the existing 500- gallon diesel fuel tank with secondary containment <br />will be reactivated to support mining activities. <br />Clay soils from nearby will be placed on the waste rock pile, compacted, and used as a base for a <br />temporary storage area for ore mined at the site. As mining continues, the waste rock pile will <br />expand in a southerly direction. Additional waste rock will be placed on top of the existing pile <br />expanding it both vertically and horizontally, moving the toe toward the south. The area below <br />the waste rock stockpile, further south, will contain the onsite runoff retention pond for the site. <br />The existing entrance road that connects to the nearby county road will be used as a haul road for <br />periodically transporting ore from the mine. <br />ESWMP -2 <br />