04-22-1985 Council Packet - Laserfiche WebLink

Home Browse Search

from the Art Center of Minnesota. Soils int., ed by the Soi 1 Survey include Anoka loamy fine sand, which would have similar percolation characteristics to Site A. This property contains a large estate with mansion and caretaker house, and would have to be subdivided to create a 6-8 acre parcel for a community drainfield. The property has excel- lent potential for a high quality housing development. Due to a centrally located wetland in the open field area where no trees would have to be removed, the costs of developing this site for a drainfield would likely include tree removal. The value of the raw land for development is probably at least $15,000 per acre, and a parcel large enough for a community drainfield would likely cost $150,000 or more. There would be virtually no difference in the cost of the collection system to get to this site, but the cost of installing the drainfield could be substantially higher. Total cost estimated at $500,000 collection system 150,000 land acquisition 150,000 drainfield and site work $800,000 200,000 plus 25% legal, engineering, administrative $1,000,000 _ 83 = $12,050/unit In either site, there is a high potential for ground water pollu- tion because of the relatively sandy soils and high nutrient concen- trations in a relatively small area. The close proximity to wetlands bordering Lake Minnetonka, as well as the proximity to developed residential areas, are also factors which make the community drain - field alternative unattractive and a potential nuisance if it experiences problems. City staff would strongly recommend against the Community drain - field alternative, based not only on the estimated cost equivalence to a standard municipal sewer system, but also on the added maintenance costs to each homeowner with individual pump stations, the need for continuing regular tank pumpouts, the potential problems of pollution and the unknown life span or efficiency of such a system. OPTION 6. Installation of individual holding tanks with off -site disposal. Where on -site treatment and disposal of septic tank effluent is not possible due to site limitations, an individual holding tank is often a reasonable solution if A) The water use is minimal, such as in a seasonal cabin; or B) When construction of collection system with off -site treatment and disposal is imminent. Orono code allows hold- ing tanks only as a temporary solution for existing problem situa- tions, and never for new construction except of a temporary basis during construction. The costs of installation of a 2000 gallon sealed concrete hold- ing tank is estimated at $2,000. The yearly maintenance costs are exceedingly high, depending on actual water use. Cost of pumpouts is 13