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N ATTACHMENT A Manager Reviewed,*. 10 Item Msicriptiow Gold Eagle Building Addition 11 12 DATE: 06/18/07 ITEM NO.: I O.k Agenda Section: Backgriound: The moiler of Gold Eagle at 1233 Larpenteur Avenue is seeking a building permit for an addition to their existing building, which was constructed in 1961. This building, is located in the 5,22 acre Gottfried Pit subwatiershed, a land- locked basin, owned and operated by Ramsey County,, Discharge from, Gottfried Pit is currently controlled by two pumps with a combined ,capacity of approximately 7 cfs. There is a constructed berm around the pit, enabling the water to rise to an elevation hi ,gflier than surrounding properties. Due to this berm, the 100- yr high water elevation of Gottfried Pit. i's 9119,26., The City's Comprehensive Surface Water Management Plan (CSWM.P), developed in 1990 and. updated in 210,03, has specific policies regarding the low floor elevations (LFE) of buildings in sub watersheds. This plan is adopted as a part of the, Comprehensive Plan. and referenced in City code 10 1 6.26B2. Specifically, Section 3 of the WMP,, includes the following policies.- Policy 2, I y 1.31 — Freeboard requirements All new structures are required to be constructed so that the 'low floor elevation is at least 2 feet above the peak water surface elevation for the critical I 00-year recurrence interval precipitation event and at least I foot above the surveyed overflow elevation of any immediately adjacent surface waterbody, wetland or stormwater basin. Policy 1.4 — Freeboard requirements rements for land-locked areas Where structures, are proposed below the overflow elevation for a land-locked basin, the low-floor elevation is to be. kept at a minimum of 2 feet above the peak water elevation as determined from the highest of either the I 00-year, I 0-day event or back-to-back I 00-year, 2.4-hour rainfalls Policy 1.8 — Vulnerable area emergency response plan Areas where 100-year flood protection is not possibile will be identified and emergency response plans will be developed for those areas. In reviewing Gold Eagle"s building addition request,, we have determined that this building does not meet policy 1.3 or 1 A of the CSWMP. The existing and proposed LFE on the building is 912.6. In order to meet the, building elevation would have to be at 921.26, which is 13.26 feet above the the, freeboard requirements, I curb,, and 8.16,6 feet above the existing building elevation. Additionally, all of the existing buildings in Roseville He that are located along Larpenteur Avenue between, Fern"rood and the Pit are lower than the I 00-yr high water elevation, and therefore do not. ineet the freeboard requirements in the CSWMP. 47 Further,, we do not believe that Gottfried Pit elevation is the most critical to Gold Eagle's building elevation. The more critical elevation for this property is the flooding elevation of the low point. just. to the east of 4,9 Gottfried Pit near the intersection at Fernwood and Larpenteur. This low point is hydraulically linked to the 50 Pit and frequently floods during rain events. Causes of flooding in Larpenteur can be attributed to multiple