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<br />0 <br />>_ <br />W <br />U <br />W <br />• <br />~ III IIIIIIIIIIIIIIII <br /> ~, <br />Memorandum <br /> <br /> <br /> <br />O "~ <br />j ~ To: Gary Curtiss, Division of Minerals and Geology <br /> <br />~ ° <br />c CC: Files <br /> 0 <br />From: Mike Applegate N1~ <br /> O <br /> Date: March 27, 1997 <br /> Re: Revisions to Deer Creek Canyon Quarry Sediment Control Plan <br />p~r~It~FD <br />MAR g 81997 <br />Dirtggn et mmercic a ~wicGl <br />Attached is a revised copy of the hydrology model and the sediment control plan for the entve <br />quarry. We believe this reflects the changes that were discussed N the field at the site. A recap of <br />the concepts that aze outlined N this large scale plan are: <br />1. The existing upper'pond (UB l) at the top of the quarry will have the concrete culvert cleaned out <br />and a spillway installed for routing excess flows. <br />2. The Upper Bench Pond 2 (UB2) will serve to catch and route flows via a new channel over to <br />the abandoned access road that climbs along the north slope of the quarry. This upper bench <br />area will be graded to capture the majority of flows Crom Basin A, Basin B and Basin D. The <br />use of this road will eliminate stonnwater flows running through the tailings pile that lies on that <br />steep rock face between the upper and middle bench. All flows running down this road will be <br />routed into Pond MB I. The channel that is graded into the bench road will be founded on solid <br />rock and will have minimal need for tiptop improvements. <br />3. A small sediment pond (UB3) in Basin D will be constructed and used to route flows over a rock <br />clitY face to Pond MB I on the next bench dawn. It was agreed that wherever passible the use of <br />these rock faces would serve as effective energy dissipation if the flows could be captured on the <br />bench below. <br />4. Pond MB I will route flows to the northeast comer and drop flows over a rock cliff face down to <br />Pond LB I. This pond is located on the northwest side of the lower bench. <br />5. A secondary pond (LB2) on the lower bench will be located on the south side to capture Flows <br />coming down the bench road from Basin F which is a very small basin. Some minor erosion <br />control structure such as staked straw bales will be used to route flows down this road to the . <br />.. ~ ~ .°~~ <br />~ ~'al~~ <br />