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<br />WATER INFORMATION EXN181T G <br />FEBRUARY, 2003 Rules 8 Regs 8.4.7 <br />OURAYCOUNTY ROAD b BRIDGE DEPT <br />P. O. BOx 468, Ridgway, CO 81432-0168 <br />PHONE: 970 82B- 5391 -FAX: 628.4/39 " <br />°DALLAS GRAVEL° PeRN1T N°- M 7978.268 <br />Sce 3, T45N, RBW, NMPM, OullAr CouNTV, CO <br />AYCNONENT AVYLICATION - RCG N2 OVeR CONST MAT'L <br />f1 a4~R11 <br />The operation is not expected to affect the groundwater system at the site. The deep granular soils and steep <br />terrain preclude the occurrence of the groundwater table aim r~u anywhere in the near-surface zone of the <br />material extraction. <br />r4 e.~.~Rl Ntll <br />Intermittant drainages evident from the pre-mining condition seldom exhibt any stormwater or snowmelt <br />runoff, due to the increased absorbency of the area surface by exposing the granular soil in the extraction <br />processes. <br />rs 6.asR1 ag <br />Downslope runoff on the finished excavated slopes shall be controlled by incorporating a forest access road <br />and two level end-to-end runoff control benches into the slope. The 12-foot wide, slightly insloping water <br />retention benches will effectively intercept and retain any downslope runoff to absorb into the granulaz soils <br />at the un-topsoiled bench. Specified "rough surface grading" should assist in that effort for better water <br />retention. <br />A water retainment/siltation pond shall be excavated below the area of mining disturbance into the un- <br />named intermittant drainage (herein called Middte Cree/2') that exits the southwest downslope side of the <br />site. This pond is designed to retain runoff or snowmelt from a 100-year storm event to normally prevent <br />off-site stormwater runoff, provide sediment settling, and allow surface water to percolate into the granular <br />subsoils surrounding the pond. <br />Due to already excavated portions of the current site approximately 6.07 acres of surface area have been <br />«pirated" from the un-named drainage to the north (herein called `North Cree/z"), to drain into the site- <br />affected `iLliddle Creek" drainage and thus downstream into the un-named south drainage (herein called <br />"South Creek". Easterly portions of the proposed site extend just to, but not into, the South Creek drainage. <br />Completion of the proposed extraction of materials shall increase that "pirated" area by only another 3.01 <br />acres. <br />Relocation of the forest access road during proposed operations to across the upper slopes of the site shall <br />effectively intercept and divert the runoff from undisturbed portions of the watershed above the site to <br />whichever drainage (North Creek or Middle Creek) as seems appropriate to B.L.M. range managers. A road <br />culvert will be required across that road at the northeast corner of the site to divert that runoff to Middle <br />Creek. Otherwise the runoff shall be directed northerly via the road's right borrow ditch to the existing <br />"loop mart" and thus into the North Creek drainage. <br /> <br />File: El OurdyCOlDaIWSGravI112AmendAppl 24 <br />OYL7i03 <br />