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o The period of time between disruption of the soil and <br />revegetation or stabilization will be kept to a minimum. <br />The applicant has not proposed an air quality monitoring <br />program because it is not anticipated that more than 50 tons per <br />year of controlled emissions will be released at the mine site. <br />The applicant has proposed a water control system of diver- <br />sion ditches, sedimentation ponds, and a temporary impoundment. <br />All runoff is routed around disturbed areas or to a sedimentation <br />pond, with the exception of Phase IX and an adjacent area, as <br />shown in Figure 2, Volume 1 of the permit application. <br />Diversion ditches are unlined and triangular in shape. <br />Flow from disturbed and undisturbed areas will be carried via <br />these ditches into sediment ponds or around mining operations. <br />Sedimentation ponds are designed to hold the 10 year, 24 hour <br />storm without releasing flow through the emergency spillway, and <br />include sufficient sediment storage volume. Primary outlets are <br />culverts some of which (ponds 1 and 4) are gated. Emergency <br />spillways are trapezoidal, broad crested weirs with riprap speci- <br />fied to be used where necessary to control erosion. The emergen- <br />cy spillways are sized for the peak flow for the 25 year, 24 hour <br />event. Culverts are corrugated metal pipe (CMP) and are sized <br />for the 10 year, 24 hour peak flows (attachments, Addendum I and <br />II, and pp. 35-43 Vol. 1 of the permit application). <br />The proposed surface water monitoring system is comprised of <br />two stations. The first, as described in page 16 of the text in <br />Appendix C, Baseline Hydrologic Investigation, is a weir located <br />in the drainage bottom on the eastern lease boundary, and the <br />second in the culvert located below sediment pond 4 in the North <br />Fork of Bolton Draw. The measurement and frequency of sampling <br />proposed by the applicant are weekly during flow periods for <br />point 1 and daily during periods of discharge for point 2. Qual- <br />ity samples will be taken four times during spring and summer for <br />-39- <br />