06/17/86 Special Meeting - Laserfiche WebLink

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.~. .." - -2- In Pecflllber 1985, the Counollr.v1ewecl a, related reterral (rUe Bo. 13315-1) for FHA sub4iv1aion approval that would ake the propoeed houeing unite in the tiret ph..e of the Northfork develC!pment eli&1ble tor federalllOrtgage inSlrance. The tirst phaee oons1sts ot 112 loti on 136 acree with outlote totaling 1,120 aores. 'nIe Collnoll stated that with the olltlote undeveloped, the proposal wes cone1stent with Metropolitan Development Frpework policies. However, the CouncU allOreoo_ended' that fIlrthel' pha"s of th1s development be reviewed again for oona1stenoy prior to approval. . : .,', ~. ~,. . . ANALYSIS ". '.: Sewere 'nIe Ilorthfork PUD is to be located in the ecuthweet oomer of the citY or JlaIIIsey. The 250 hClllltlS will be &rOUped together in subdivisions containing individual dwelling lots of allollt 2-112 acres ~ area. All of the development will Ilae on-site sewage disposal and Sndiv1d~al'wella tor 'domestic water SUpply. .' .- The density or development ie extremelY high for~the kind of water supply and wastewater disposal proposed even wen the. soila of an area are ideal for these systems. The soils of this p.,.t of Ilamaey-hpe '..vere l1III1tat1one. . , . . . . : ':~ ~ r. .:., 'nIe report Ilaed the llS-8CS 'soU' descripti0D8, whioh' ebow that all except one or the soila have severe l1III1tationa. 'The' one soU 'without severe l1mitat1ons covers an area of abol1t three'aoresor abol1t fte lot. The EIS states the "moderate to severe" soils mst be avoided or additional development measllres Slch as f111ing over the severe so1la IIIllst be taken to allev1ate the problem. The subd1vision lsyout av01ds the wet so1ls. The development IIIllst also be part10ll1arly careful to av01d pIltt11l1 the dra1nf1elda of on-site sewage d1sposal systems on these so1ls or the eystems will become inoperable. Some of the areas of F1gI1re 26 to the west and northwest of Lake Itasca show the s01ls to be well Sl1ted for development but baVe poor f11ter:lng capaCity. Soils with poor fl1tering capacity wUl allow septate to rapidlY reach the groundwater and CSlSe a blUdup of nitrates aIld other pollutants in the groundwater that is used for dcmestic use. In general, all blt three acres of the 1,250-acre arsa are severelY restricted for proper wastewater disposal. The EIS states that desilll1 modifications can be used to llitigate these problems. A mound system on wet soila eb0l11d be used very spar:lngly because these systems are hard to bl'Ud, have a relativelY abort life clI1e to stability of the base soU aIld do allow nitrates 'to the grouJidWteio. 'nIese systems are Ilsed occasionallY to correct existillS system problems blt the extensive use of these systems for a new Slbdiv1sion is not a desirable practice. The EIS does not addrellll what w111 be dCll1e to lIlitigate the impact of systems :In soils with high permeability although it does suggest so. of the lIleaSlres Slch as improved soils at the bottom' of the'trenchea..'1""'" :" This development is in a high-risk ares froll a 'Ililila standpoint. It 1a also in a locat10n where central sanitarY' sewer ae!"l'lce linked to the Metropolitan System cannot be easilY provided. ;'" . . :.;.:., 'i.-:':.:.' I \ r ; ( \ -58- t