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HomeMy WebLinkAbout1.04 County Floodplaing Letter Follow-up 06.19.2019P.O. Box 1908 1011 Grand Avenue Glenwood Springs, CO 81602 Z4NC4NELL4 4ND 455oC14TES, INC. ENGINEERING CONSULT4tITS May 2, 2019 Rev. June 13, 2019 Glenn Hartman Garfield County Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 Via email to: ghartmann(cr�garfield-county.com (970) 945-5700 (970) 945-1253 Fax Re: Cattle Creek Commercial Center Building Permit Application and Related Floodplain Mr. Hartman: This letter is to respond to your email of April 30, 2019. As noted in our previous letter, in 1999 our Client filed for a special use permit to place fill on its property in the floodplain of Cattle Creek pursuant to GCLUC Section 4-109. The purpose of the fill was to provide a "platform" to enable the construction of buildings on the property such that normal building construction and drainage considerations would easily result in the finished floor elevation of any subsequently constructed building to be at least one foot above the appropriate floodplain elevation. In accordance with discussions with county personnel an exhibit entitled "General Location Map, Buildings, Fill and Floodplain Information" is attached to this letter to illustrate various locations and elevations pertinent to the subjects discussed in this letter. By Resolution number 99-114, the Board of County Commissioners approved the special use permit, subject to certain conditions. A discussion of those conditions was included in our previous letter of January 15, 2019. This letter includes a discussion of Garfield County June 13, 2019 Page 2 the items included in GCLUC Section 4-109, as requested. The specific items from that section follow: [GCLUC Section 4-109] A. Review Criteria. A Floodplain Development Permit may be issued by the Director or designated Floodplain Administrator if it is found that the application is in conformance with section 3-301, Floodplain Overlay Regulations, and upon weighing the following relevant factors: 1. The danger to life and property due to flooding or erosion damage; The danger to life and property due to flooding or erosion damage has been mitigated by filling the area in question to an elevation above the regulated floodplain elevation. Since the area in question is filled to an elevation above the regulated floodplain, floodwaters should be constrained to travel within the floodway. That is the purpose of the regulated floodway, to maintain an unobstructed channel area sufficient to convey the regulated flood. 2. The susceptibility of the proposed facility and its contents to flood damage and the effect of such damage on the individual owner; The purpose of elevating the area in question above the elevation of the regulated floodplain is to raise the improvements placed on the higher elevation above the influence of floodwaters. 3. The danger that materials may be swept onto other lands to the injury of others; Again, raising the developed area above the level of the regulated floodplain will prevent stored materials from being swept away during flood events. 4. The compatibility of the proposed use with existing and anticipated development; The currently proposed buildings are a continuation of the existing development and are thus compatible with the existing and anticipated development. Garfield County June 13, 2019 Page 3 5. The safety of access to the property in times of flood for ordinary and emergency vehicles; The main access roadway to the property is not within the regulated floodplain so no change in access or safety of access is expected in times of flood. The secondary access areas associated with each building are located on the elevated area and are thus above the floodplain elevation. (See attached Access Exhibit for additional information.) 6. The costs of providing governmental services during and after flood conditions, including maintenance and repair of streets and bridges, and public utilities and facilities such as sewer, gas, electrical, and water systems; All utilities except electricity are privately provided by the existing development. The electrical service is on poles overhead, so no disturbance would be expected to the electrical service provided by the local electrical utility. 7. The expected heights, velocity, duration, rate of rise, and sediment transport of the flood waters and the effects of wave action, if applicable, expected at the site; Again, since the area in question is elevated above the floodway area normally affected by floodwaters, the area is not expected to experience detrimental effects from floodwaters. 8. The necessity to the facility of a waterfront location, where applicable; Not applicable. 9. The availability of alternative locations, not subject to flooding or erosion damage, for the proposed use; and The area in question has already been raised above the elevation of the regulated floodplain, so no other alternative is available nor desirable. Garfield County June 13, 2019 Page 4 10. The relationship of the proposed use to the Comprehensive Plan for that area. No change in use or zoning is contemplated. Sincerely, Zancanella & Associates, Inc. 7 &ct Timothy P. Beck, P.E. TPB/soe Attachments CC: Eric Rudd Lee Leavenworth • COLORADO HIGHWAY 82 n 1 PROPOSED 1 BUILDING: A NI FINISH FLOOR 6015.0 (MIN.) PROPOSED \ BUILDING: AA \ FINISH FLOOR 6015.0 (MIN.) EXISTING BUILDING-B NOT IN FLOODPLAIN J / / / / I / N cj ) \ ,,--- *N.... (,,('- , \\ i , ,, ,...,_ ____,,,._.„ ____. ____), _____, ___, ,,, iy / PROPOSED • BUILDING: CC • FINISH FLOOR / 6015.0 (MIN.) • • • • \ • • \, • \ • • • • SHADING SHOWS APPROXIMATE AREA WHERE FILL HAS BEEN PLACED • • �yr ,_---:4,- / /-1-------- \ • ,/(\ -_,�• • • • • • • OUNTY ROAD 113 \\ '.� I \ .� \,y-� • • • • 1 l I I \I 11 I GENERAL LOCATION MAP BUILDINGS, FILL, AND FLOODPLAIN INFORMATION SCALE: DATE: SHEET NOTED 02 MAY 2019 1 OF 1 GRAPHIC SCALE 100 0 100 200 400 S7 S8 S18 S17 100 YEAR FLOW WATER SURFACE ELEVATION ( IN FEET ) 1 inch = 100 ft. FLOODPLAIN BOUNDARY (TYP.) FLOODWAY BOUNDARY (TYP.) CATTLE CREEK STREAM BANKS TBuilding A Minimum Proposed Finished Floor Finished Floor Elevation Elevation Existing Finished Floor Elevation 6015.0 6020.0 AA 6015.0 C 6015.0 CC 6015.0 6015.8 6016.5 E 6016.8 6019.6 F 6016.8 6018.9 6022.7 6018.0 6021.8 l 6021.6 NOTE: Buildings B, K, and L are not in the regulatory floodplain. Cattle Creek Commercial Center Wayne Rudd SHEET NO. 1 1 06.19.2019 REVISE BLDG ELEVS AND TABLE REV DATE REVISION NO. TPB TPB TPB MADE CHKD APPD BY BY BY DRAWN BY: CHKD BY: APPD BY: PLAN NO. TPB TAZ TAZ FLOOD2... Z,,4NC,4/VELL/4 AND ASSOC/,TES; /NC. ENG/NEER/NG CONSULTANTS POST OFFICE BOX 1908 — 1005 COOPER AVENUE GLENWOOD SPRINGS, COLORADO 81602 (970) 945-5700 PROJECT: 97404.01 J i.a PROPI BUILD 125.0' PROPOSED BUILDING: AA PROPOSED BUILDING: D 4-11 125.0' IIRIVP BUiLDINCi� 41, • )4:to �a J • :Z. 414 a © 2019 Microsoft Corporation © 2019 DigitalGlobe ©CNES (2019) Distribution Alrbus DS tx • Jrlo 144‘ 6 I k { 0;44 kali / f • { i