06-24-1991 Council Packet - Laserfiche WebLink

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f'* • !'- h t^- U V I W>. it- U' -’J^. pAI*''' Dave Peterson January 22, 1991 Page 2 A listing of site factors and ratings for each property (property number keyed to nujfiber on property data sheets) is attached as an addendum to the data sheets from the original report. Although these ratings are somewhat sujective until actual site testing and measuring is done, I think they are probably 90% accurate. Of the 87 existing residences within the proposed project boundaries, 30% would have absolutely no replacement option other than a holding tank. Another 30% have only a minimal possibility of anything other than a holding tank. Another 23% are in a ■questionable* category and careful soil testing and site evaluation would be necessary to determine whether a system is feasible. The remaining 17% probably do have the ability to replace the existing system with a fully conforming system, which in almost every case would have to be a mound given the area's soil and water table conditions. Update on DlOl Shoreland Reguations As noted to you previously, the City has until February 1992 to adopt DNR Shoreland Management Regulations. The DNR has made specific requirements for sewage treatment system provisions which must be adopted. These provisions include a requirement that existing "non-conforming" systems be made conforming whenever building permits are applied for. While cities may have some leeway in determining what types of permits trigger the septic upgrade requirement, we should anticipate that any interior remodeling, room additions or new construction will trigger it. We would probably not require system upgrades for merely maintenance type permits such as re roofing, re-siding, etc. Since our meeting on October 30th, I have had discussions with various representatives of the MPCA and DNR regarding their interpretation of what is conforming or non-conforming systems. The definition of non-conforming systems will likely include those existing trench systems which do not meet the "3-foot elevation above water table or saturated zones" requirement. The ramifications of this are that for Stubbs Bay properties located less than 1000' from the shoreline, probably 90% or more of the existing systems will be considered as non-conformingr because, with our clay soils, most of the existing trench systems will not be located 3 feet above zones of mottling which indicate seasonal saturation. The effective result then, is that most Stubbs Bay area residents who want to improve their properties will have to make their septic systems conforming, which in a majority of cases probably means installation of a holding tank. V