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Mr. William S. Tate -5- February 17, I982 <br />monthly water levels and flows. The mine inflow monitoring should include: <br />1) mapping of mine inflows on a mine workings map, 2) tabulation of the flow <br />rates, pN's, electro-conductivities, and temperatures of the inflows, 3) the <br />amount of water discharged from the mine, and 4) a description of the source <br />and occurrance of mine inflows. Surface water monitoring should be continued <br />on Hubbard Creek above and below the mine site to complete the baseline water <br />quality sampling. These samples should be analyzed quarterly for the parameters <br />in Attachment A. The quantity of water should be measured at the time water <br />quality samples are collected and on a monthly basis. A11 data should be <br />submitted to the Division quarterly. After the year's ground and surface water <br />quality baseline has been com,oleted, the Division may reduce the number of <br />parameters analyzed and the frequency of analysis. <br />4.03 Roads <br />There are two sections of Rule 4.03.1 which have not been detailed in the appli- <br />cation. They are: <br />4.03.1(1)(d) The design of haul roads shall be certified by a registered <br />professional engineer. (NO drawings signed and sealed by a P.E. have been <br />pro vi ded . ) <br />4.03.1(4)(e)(i) Bridges with a span of 30 feet or less shall be designed <br />to safely pass the 20-year precipitation event. Bridges with a span of more <br />than 30 feet shall be designed to safely pass the 100-year precipitation event. <br />(NO specification of the span of the bridge or determination of the design flow <br />has been provided.) <br />Detailed descriptions of the remedies to these problems are given below: <br />4.03.1(1)(d) A drawing of the haul road, as it exists, showing a plan <br />view of the road and a correl.sted Longitudinal profile, bearing the seal and <br />signature of a registered professional engineer must be provided. A drawing <br />of a typical cross-section of the haul road showing cut and fill slopes, native <br />surface slope, berms and road crowns must also be provided. <br />4.03.1(4)(e)(i) A drawing showing the entire upstream drainage area of <br />Hubbard Creek at the haul road crossing must be provided. The length of the <br />span of the bridge must be sp.=cified, and a demonstration including all <br />assumptions, methods and calculations must be provided to show the amount of flow <br />the bridge is capable of passing. Depending upon the span of the bridge, a <br />determination of the peak flow from the design event must be provided. <br />9.05 hydrologic Balance <br />Verification of the topograph!) as shown on Exhibit H - Calculation Areas for <br />Sedimentation Ponds, using the= U.S.G.S. Bowie Quadrangle map, stereographic <br />aerial photographs and other ~=xhibits in the application, is not possible. It <br />is apparent that the undistur,hed on-the-groufid drainages labeled as areas 1 <br />and 3 are considerably larger than shown on Exhibit H. <br />