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Transit Mix Concrete Co. <br /> 19)Comment: Figure G-9. The requested ditch and grade-to-drain directions were not <br /> provided. Please provide the requested information. <br /> Response: Figure G-9 has been revised to show the direction of flow in each of the <br /> ditches. <br /> 20)Comment: Figure G-10. The requested ditch and grade-to-drain directions were not <br /> provided. Please provide the requested information. <br /> Response: Figure G-10 has been revised to show the direction of flow in each of the <br /> ditches. <br /> 21)Comment: Figure G-11. The requested ditch and grade-to-drain directions were not <br /> provided. Please provide the requested information. <br /> Response: Figure G-11 has been revised to show the direction of flow in each of the <br /> ditches. <br /> 22)Comment: Figure G-12. The requested ditch and grade-to-drain directions were not <br /> provided. Please provide the requested information. <br /> Response: Figure G-12 has been revised to show the direction of flow in each of the <br /> ditches. <br /> 23)Comment: Figure G-14. Cross Section AW shows an outlet pipe to the creek. The <br /> expressed intent"to excavate a trench/notch for the pipe" is an adequate response. <br /> Response: No further response is necessary. <br /> 24)Comment: Figure G-15. The culvert profile. The expressed response and minimum"1% <br /> slope"note added to the drawing provides an adequate response. <br /> Response: No further response is necessary. <br /> 25)Comment: Attachment G-1, SEDCAD Model Reports — Times of Concentration. The <br /> revised SEDCAD times of concentration limiting overland flow lengths is an adequate <br /> response. However, the stated initial assumption suggesting vegetative and litter cover <br /> would cause overland flow to occur for longer distances demonstrates an incomplete <br /> understanding of how excess rainfall flows through a watershed. Greater litter and rough <br /> cover actually cause the length of overland (or sheet flow) to decrease. Sheet flow is <br /> defined as that which is about 0.1 feet in depth. Litter,rocks and ground debris cause these <br /> shallow flows to be deflected around these small obstacles causing rivulets to form;forcing <br /> the second category of runoff flow(shallow concentrated flow)to be initiated. Steep slopes <br /> have a similar effect by accelerating the sheet flow such that it is more likely to initiate <br /> small erosion rills(as is frequently observed on steep unvegetated soil stockpiles), leading <br /> to shallow concentrated flow. Shallow concentrated flow is the formation of small rivulets <br /> Hitch Rack Ranch Quarry Permit Application M-2016-010 <br /> September 15, 2016 7 <br />