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Town of Silverthorne, CO Summary of Community Comments This summary is in response to community comments received during the 90-day appeal period for the Type 19 study for the Town of Silverthorne, Summit County, Colorado, The Federal Emergency Management Agency (FEMA) received comments from Mr, Daniel Gietzen, Town Engineer, Town of Silverthorne, dated November 23, 2000, and from Mr, Mike Cuthbertson, Operations Manager, Silengo Homes, dated November 20, 2000, Mr, Gietzen's letter enclosed the comments from Mr, Cuthbertson. We appreciate your community's interest in assuring that the Flood Insurance Rate Maps (FIRMs) for your community are as accurate as possible, The following summarizes the changes we will incorporate into the maps prior to final printing, Comment 1: RM3 and RM4 have been disturbed, The elevation reference marks shall be removed from FIRM Panel 08020 I 0014 B. The V.S, Geological Survey markers, which were destroyed before this study began, cannot be used for these maps, Comment 2: An errant BFE label on Panel 0014 B After reviewing both the profile and the Floodway Data Table, we agree that the label should be 8719 instead of 8715, The Preliminary FIRM has been corrected, and the effective map will reflect these changes, Comment 3: The expanses of Zone AE around the flood sources, These areas are quite wide and inundate a number of homes and properties, After studying the work maps, Mr, Cuthbertson concluded much of this area will be subjected to less that 1 foot of flooding and requested that the area be published as a Zone X (shaded), Appendix 2 of FEMA's Guidelines and Specifications for Study Contractors (FEMA 37, copy enclosed), establishes the procedures that FEMA uses to designate zones in shallow flooding areas, Appendix 2 ofFEMA 37 explains, "flood hazard zone designations should extend across the entire inundated area without separate designations of X zones at the edges of an AO or AH zone, Thus, X zones should be used only when the depth across the entire inundated area is less than one foot. An AO zone should not be used at the edge of an AE zone," Zone X (shaded) is an area of shallow flooding where the average depths are less than I foot. Therefore, we do not designate X zones at the edge of an AE zone, E' Although we cannot revise the map, property owners can apply for a Letter of Map Amendment (LOMA) or a Letter of Map Revision Based on Fill (LOMR-F) if their properties are entirely above the BFE. These elevations must be confirmed bv a licensed survevor in order to be approved bv FEMA. Comment 4: Erroneously drawn floodway boundary delineations for the Blue River, specifically between Cross Sections AW and AY Three locations were referenced and amended on the Preliminary FIRM, We determined that these discrepancies were caused by the hydraulic model. The changes will be shown on the effective FIRM.