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Transit Mix Concrete Co. <br /> Paragraph a. Site Climate (p. G-12) acknowledges NOAA Atlas 14 has superseded NOAA <br /> Atlas 2 (on which the county regulations are based,using data available only prior to 1973), <br /> but cites using this older 1973 data. Depending on the "point" selected in the NOAA Atlas <br /> 14 (based on data available in 2013), the 100-year, 24-hour precipitation depth can <br /> reasonably be expected to be between 5.34 and 5.4 inches. This is 16 to 17 percent higher <br /> than the outdated NOAA Atlas 2 selected estimate of 4.6 inches used in the revised analyses. <br /> As such, the SEDCAD results in Appendix G-1 are not adequate for Division approval. <br /> Please revise the runoff estimates using NOAA Atlas 14 data. Additionally, as the Division <br /> requires designs based on the 100-year event, please refrain from providing results to the <br /> Division for the 10-year event. <br /> Response: The rainfall depths have been updated using values from NOAA Atlas 14, <br /> and Table G-2 has been updated. Based on the NOAA Atlas 14 precipitation for the <br /> 100 year-24 hour, an intensity-duration-frequency (IDF) curve was developed. The <br /> precipitation report from NOAA Atlas 14 and the corresponding IDF calculations are <br /> included in Appendix G-1. <br /> 5) Comment: Page G-11 [now p. G-13], Table G-3. The response is adequate. <br /> Response: No further response is necessary. <br /> 6) Comment: Page G-12 [now p. G-14], paragraph a, Ditches. The response is adequate. <br /> Response: No further response is necessary. <br /> 7) Comment: Page G-12 [now p. G-141, paragraph i, Terrace Ditches. The response is <br /> adequate. <br /> Response: No further response is necessary. <br /> 8) Comment: Page G-13 Lnow p. G-157, paragraph ii. This paragraph states the PADER <br /> method is used for riprap sizing. The response is adequate with the exception of <br /> reclamation phase channel DD-F1-1 which Table G-4 indicates has a slope of 25 percent. <br /> The USACE EM-1110-2-1601 steep slope method (eq. 3-5) is valid for channels sloped <br /> between 2 and 20 percent. An alternative method for sizing riprap for the channel must be <br /> selected. <br /> Response: The USACE EM-1110-2-1601 riprap sizing method was used for channel <br /> slopes ranging from 2%to 20%,and the Simons/OSM method contains design values <br /> for slopes up to 50%and was used for steeper channel slopes. <br /> 9) Comment: Page G-13 [now p. G-167, Table G-4. The response is adequate. Please see <br /> Comment No.32. <br /> Response: No further response is necessary. <br /> Hitch Rack Ranch Quarry Permit Application M-2016-010 <br /> September 15, 2016 5 <br />