Laserfiche WebLink
1 ~ • • <br />' RESPONSES TO TECHNICAL REVISION TO PERMIT NO. 76-16 <br />ADEQUACY REVIEW LETTER DATED JANUARY 17, 1983 <br />' Sediment Pond E <br />1. The submittal does not include a detailed map and cross-section for the <br />pond. This makes the plan difficult to review. The applicant should submit a map <br />' and cross-section for the pond. This makes the plan difficult to review. The <br />applicant should submit a map and cross-section of the pond showing design details. <br />' RESPONSE: <br />' Enclosed as Figure 1, of Exhibit la, is a typical cross-section of the proposed <br />impoundment and emergency spillway. A detailed map of the area (one at a <br />' scale larger than 200 feet to the inch) is not available at this time and is not <br />necessary since an "as built" topographic map of the impoundment area is <br />' necessary to show that the structure contains the required volumes. The "as <br />uilt" designs including a topographic map will be surveyed and submitted to <br />the Division once the structure has been completed. <br />2. Pond E is sized fora 35 acre watershed. My estimates indicate that <br />' greater than 50 acres of watershed drain to the pond. Pond sizing may not have <br />included undisturbed areas draining to the pond, or there may be additional surface <br />' diversions not shown on the maps. The applicant should either verify the 35 acre <br />watershed area or revise their calculations to reflect the total area draining to the <br />' pond <br />RESPONSE: <br />1 ~/ The watershed area is 35 acres. Diversion Ditch E-4 has been added to the <br />maps and is addressed in the diversion ditch calculations. Revised Maps TR-1 <br />and TR-2 are enclosed. Design calculations of diversion Ditch E-4 has been <br />included in revised Exhibit la, Sedimenation Pond and Diversion Ditch Designs, <br />pages 9 and 10. <br />' 3. Pond E includes 0.48 acre-ft. of sediment storage. This storage <br />component was sized for 0.02 acre-ft. of storage per acre of disturbance. The <br />' sediment yield from reclaimed or undisturbed areas was not taken into account. The <br />1 <br />