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17) The second paragraph on Page 2 should refer to Attachment "A2" rather than 112". Please <br />correct this error. <br />Response: The requested change has been made with this submittal. <br />18) The last line of Page 2 should refer to Attachment "Al" rather than "1". Please correct this <br />error. <br />Response: The requested change has been made with this submittal. <br />19) The third paragraph of Page 3 should refer to Attachment "A2" rather than "2". Neither <br />does the paragraph mention sample Pll. Please correct these errors. <br />Response: The requested change has been made with this submittal. <br />20) According to the first paragraph on Page 4, the approved 24-inch flume was replaced by a 9-inch <br />version. <br />Please provide the Division with design calculations which illustrate that a 9-inch flume is <br />sufficient to carry the flow expected from dewatering the pond through the 18-inch CMP <br />that has been installed. <br />Response: Under the 10 year, 24 hour design storm assumptions for the Section 28 Pond <br />presented in Volume 13, Exhibit 7, Item 20, (page Exh. 7-20A-34), the resultant <br />peak flow of 1.79 cfs occurs at a pond stage of 7070.68 feet. A Parshall flume <br />with a 9 inch throat can measure a flow of about 8.9 cfs under free flow <br />conditions. <br />Flow through a 9 inch Parshall flume can be expressed as: <br />Q=3.07h1.53 <br />with Q in cfs under free flow conditions and h as the measured head in feet. <br />A 1.79 cfs flow rate would correspond to a head of about 0.70 feet in the Parshall <br />Flume. Thus, the existing flume is adequate for this application. <br />21) Attachment AM does not include a data point classifying Sample No. 11P. Please amend <br />the chart to include 11P. <br />Response: Sample I IP has been added to the graph presented in Attachment Al. <br />22) Attachment A2 includes Proctor Test Results for Sample Nos. 5P and 6P, the source of which <br />was never utilized for the project, but no such data is provided for Sample No. I IP. <br />Please include the Proctor Test Results for Sample No. 11P in Attachment A2. <br />Response: Proctor Test Results for Sample No. 11 P have been added to Attachment A2. <br />23) In Attachment A3, pages -8, -10, -12 and -14, the Depth / Elev column refers to "BTE", but this <br />term is not defined in the Comments section at the bottom of the page.