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Ms. Kay James - 2 - MLRD Adequacy MRA Mdy 18, 1988 Letter Response Comment/Question 3 2 The utilization of field data remains unclear. Data is reported for thirty-three sites, yet forty-eight sites are identified on the map. Did you report data collected in the sedimentation ponds and Mann Draw? 4 Re dente's article is no longer available in this office and Cook's article did not arrive with this submittal. Please accommodate us on our request. 5 3 Please clarify the width of these benches to ensure appropriate modelling. Page 40 of the MRA report indicates the bench would be the width of a CAT. A grader was mentioned during our May 18, 1988, telephone conversation. The MRA response suggests a bench will be 6 feet wide. Other Questions: What density of contour furrow placement are you proposing to utilize? (See statement in the second paragraph of Page 40 of the MRA report.) Please commit to a postanining survey of terrace placement, longitudinal profiles of terraces and three cross-sections per terrace to ensure that construction was performed as designed within thirty days of the completion of construction. 6 Noted. 7 Please commit to an annual submittal date of a rill and gulley survey and vegetative cover analysis. This date should accommodate Division review of this information prior to the fall seeding period. 8 4 Please utilize an R value of 44.25 to accommodate hydrologic predictions of snowmelt runoff. The Division's experience indicates that snowmelt does contribute to overland flow. 9 5 Noted. Additional Question: What particle size values do you propose to utilize in SEDIMOT? The model requires thirteen (13) particle size gradations. Given the importance of soil erodibility to soil loss, we must utilize values obtained from actual laboratory results.