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10. A request has been made for small area exemption (SAE) status <br />for the sediment pond access road disturbance. This request <br />appears on page 10 of the Westec report. SAE status, as <br />described in Rule 4.05.2(3), is not needed for this road, as <br />long as no disturbed area drainage, as defined in Rule <br />4.05.2(4), drains onto this road. No drainage from the waste <br />pile should enter the access road ditch. Please make this a <br />little clearer on Figure 4.1 and on the plan view of Drawing <br />95255-01. Ditch D-4, the 10 foot wide bench ditch and the west <br />end of the access road ditch all seem to run into each other. <br />Best management practices are similar to those for haul roads. <br />For access roads, the requirement is found in Rule <br />4.03.2(4)(a)(iv) and is further described in Rules <br />4.03.2(4)(b) through (e). <br />11. Appendix C of the Westec report contains a ditch design for <br />the 10$ grade haul road. However, there does not appear to be <br />any designs for the calculation of the peak flow for the haul <br />road. Please provide these designs. <br />12. There do not appear to be any designs for the sediment pond <br />access road ditch. Please provide these designs and add them <br />to the "Runoff Control Ditch Requirements" table on Drawing <br />95255-03. <br />13. On page 11 of the Westec report, the upland diversion ditch is <br />described as going across a road. However, no mention is made <br />of a culvert being used to allow the ditch to cross the road. <br />Please explain why no culvert would be needed at this road <br />area, or submit culvert designs and a revised map showing a <br />proposed culvert's location. <br />14. On page 11 of the Westec report, it is stated that the <br />proposed upland diversion ditch will run west to the next <br />drainage. A second culvert is proposed to be installed at the <br />base of that drainage, next to an existing culvert underneath <br />the railroad tracks. However, none of the maps in the Westec <br />report apparently show the westernmost extension of the upland <br />diversion ditch, nor do they show the locations of the <br />proposed and existing culverts in the westernmost drainage. <br />Please provide a map, as required by Rule 2.05.3(4), which <br />locates these structures on a certified map. If the plan view <br />map correctly shows the easternmost extension of the upland <br />diversion ditch, then no changes need to be made to that <br />portion of the map. <br />15. Please add the total channel depth for the sediment pond <br />diversion in the "Runoff Control Ditch Requirements" table on <br />Drawing 95255-03 of the Westec report. <br />If you have any questions, please let me know. <br />C:\WP51\SANBORNI.MEM <br />