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City of Mounds View Staff Report Planning Case No.506-97 December 5, 1997 Page 3 • qiiMedariiithig .,,... ;. i c t£�.:€ S F£, r agran r� li s£4 s€€•fs, :€ I t? t€£, i ..,333 � , ;mows ' �£S€}N _ s 3 s.�}<z..t,stsntts»>ta#suss�# m I } s,fL x-sx3ussnzssnnza£'`nsass 3£„ �ss££szt:'ss '£°£t££s€: �. Tit _<�._��+Rn,_< _ tiFx.ts sx&.tss."sunt Any alteration shall not cause a The applicant proposes to fill 11,850 cf of flood Yes reduction in the flood storage capacity storage capacity but will replace it with an of the wetland. additional 39,500 cf of flood storage capacity. Any alteration shall not reduce the It is assumed that the water quality of this Yes existing water quality enhancement wetland will not be negatively impacted as a value of the wetland under conditions result of the two homes being constructed,as of ultimate development long as a minimum 10-foot wide natural area is left to protect the wetland. Any alteration shall not reduce the Because more than 50%of the lots will be Yes existing wildlife habitat value of a protected by a drainage easement and the wetland. construction area limited to non-wetland areas, there will be no apparent reduction in the habitat value for the wetland. Alterations shall be carried out so as To reasonably use these two lots,vegetation will Yes to minimize the impact on vegetation. need to be removed for the construction of the Removal of vegetation within a homes. In addition,vegetation will be removed wetland zoning district shall be via the filling of one area and the excavation of permitted only when reasonably another area,but this is to serve a greater need of • required for the placement of creating additional flood storage capacity that structures and use ofproperty. will benefit all adjoining property owners of the wetland. Stormwater runoff from a development Because of the grading that will occur,it is Yes may be directed to a wetland when in estimated that potentially less runoff will be compliance with the local water directed to the wetland. While a manicured lawn management plan and only when in place of natural vegetation may elevate the substantially free of sediment, debris level of contaminants entering the wetland, and chemical pollutants. leaving a ten-foot wide strip of natural vegetation around the wetland will help cleanse runoff entering the wetland. The proposed action shall not cause Currently,all of the runoff from these two lots Yes stormwater runofffrom a development drain directly into the wetland. As proposed,the to take place at a rate which would grading and rooflines will direct 50%of runoff exceed the rate or volume of runoff as toward the street,away from the wetland anticipated by the City's Local Water Management Plan. The quality of water infiltrated to the The quality of the water that will enter into the Yes water table or aquifer shall remain ground water system as a result of this substantially unchanged. development is not expected to differ significantly from before.