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June 17, 2014C-1982-057/Seneca II-W MineJHB <br />No problems were identified with Check dam PM-2A-1. <br />T-27: was holding a pool of water approx. 1 ft. below the discharge pipes. This stock tank was in good condition. <br />The inlet slope below tank PM-2A-2 was showing signs of gullying. All materialis caught in T-27. SCC need to <br />assure this gully does not continue to down cut. (photo15) PM-2A-2 was dry. The lower riser was broken. <br />Sediment has filled pond to lower pipe.(photo16) <br />PM-2A-3 was dry. Risers appear intact. The inslope of this surge tankare gullying into stock tank. (panorama <br />photo18) <br />Check dams in PM1-A were in good condition. Check damPM1-A-3 was dry. The upper riser appeared intact, <br />the lower pipe appeared intact, but the riser was dislodged from the lower pipe. <br />Check dam PM-1A-2 was holding a shallow pool of water. No problems were identified with this embankment. <br />Check dam PM1-1 was holding a shallow pool of water. Some noxious weed specieswere observed at Check dam <br />PM1-1. <br />PM-4D: This steep drainage to Pond 15 has been repaired previously by SCC. SCC used erosion fabric with poly <br />fiber netting in an effortto stabilize this drainage. The upper 30 or so feet were visually torn up by water flow. <br />Below the visual damage, it was found that the fabric was undercut most of the remaining length of the drainage <br />(Photo 27). A more substantial and permanent fix will be needed for this slope. A revision to the permit may be <br />necessary to provide effective designs for this PM-4D drainage. SCC was awareof the damage to the upper <br />portion of this drainage, but close up observation was necessary to recognize the undercutting of the lower portion. <br />SCC personnel discussed this drainage with the inspector prior to the inspector heading into the field. <br />PM-10: Four drainages meet and flow through Culvert PM-10, at the head of the Pond 015 watershed. These four <br />drainages are PM4-C, PM4, PM4-A and PM4-B. The area draining through this culvert is not large, but it is on <br />the lee side of the ridge. A large snow drift collects in this valley in the winter months. Run off from this <br />reclaimed area drains into a previously undisturbed drainage that reports to Pond 015. This drainage has been <br />incised in sections of the upper drainage 3-5 feet deep(Photos 21,24, 25, and26). SCC has attempted brush <br />packing, and fabric reinforcement in sections of this drainage, but the efforts have failed. The vegetation in this <br />drainage is primarily Aspen/mountain brush, very dense, and the slope is very steep. This drainage allows runoff <br />from reclaimed disturbed land to flow through a previously undisturbed drainage and report to a sediment pond. <br />The Division considers that this connecting drainage needs to be included in the disturbed area definition. <br />Rills located east (upslope) of Culvert PM-9 are down-cutting and becoming a gully (greater than 12” deep). <br />These rills need to be stabilized to retard further down-cutting. <br />Surge tank PM-2B-1 was holding a small pool of water and exhibited some rilling on the inslopebut rilling was <br />not excessive. <br />SCC personnel had questioned if erosion in drainage PM5 downgradient from Pond 005 required armoring or <br />other action. The area in question was west (down gradient) from Pond 005 and west of rip pap armored steep <br />sectionsof the drainage. The rip rap section is stable and not downcutting. The drainage flattens out and enters a <br />looser subsoil substrate. In this flat area there is bank cutting, which then passes into stable sections of the <br />Number of PartialInspection this Fiscal Year: 8 <br />Number of CompleteInspections this Fiscal Year: 4 <br />414 <br />Page of <br />