05/08/1995 Council Packet - Laserfiche WebLink

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Ms. Mary Kay Wyland April 20, 1995 Page 7 Page 3, Paragraph 6 According to the most recent "Soil Sensitivity Map"" provided by Anoka County, the soil sensitivity rating for this project is in the range of "Very High -- Hours to Months." (The opposite range of this survey is "Low -- Decades to a Century" to compare how critical is this issue is, to the soils here.) The definition for "Soil Sensitivity" is the estimated travel time for water -borne contaminants at the land surface, to reach the uppermost aquifer. So contamination from residential pollutants is a major concern. The Soil Sensitivity analysis is an attempt to locate those areas of geologic sensitivity for surface contamination to reach ground -water resources. The map portrays an estimate of the time of vertical travel for water soluble contaminants, primarily nitrates, to reach ground water aquifers. Where municipal sewer services are provided, contamination from on-site septic systems, the primary source of nitrate contamination, is eliminated. The primary contaminants from residential development are in the form of total suspended solids along with other pollutants adsorbed to the solid particles. These pollutants are not readily transferred through soil to ground water resources. Page 3, Paragraph 7 The residential pollutants from water run-off of this project has the potential to filter down to the ground water table and contaminate the well water of nearby homeowners. Mand of the wells are ns shallow as 60-70 feet. The primary contaminants from residential development are in the form of total suspended solids along with other pollutants adsorbed to the solid particles. These pollutants are not readily transferred through soil to ground water resources. Page 3, Paragraph 8 On the north side of Holly Drive West, Pond #2 is n small holding pond draining excess water from Road H with a low gradient of 885 feet. Should the outgoing culvert draining into Basin A, be unable to ]handle all excess water problems, there is only a 5 -foot capacity before water could potentially overflow into the adjoining 5 -acre parcel with a gradient of 890 feet. This property owner at 1101 Holly Drive West, whose hobby farm will be surrounded by this project on three sides, is concerned that her horse pasture will not be having the project's residential contaminants be absorbed into her pasture grass --- thereby causing problems for her grazing animals, who utilize every square inch of the pasture for their needs. The outlet from Pond 2 is designed to maintain pre -development discharge rates, but even in the event of five 100 -year storm events, the maximum elevation in Pond 2 is estimated to be 889.75, more than two feet below the maximum elevation of the pond. In the unlikely event the pond did overflow, runoff would not flood the adjacent property to the south as it is located at a higher elevation. The property at 1101 Holly Drive West actually contributes runoff to Pond #2 from the northeastern corner of the parcel. Page 4, Paragraph 1 On the above 5 -acre parcel (1101 Holly Drive West), the developer has taken the liberty to install over 100 feet of a proposed drainage culvert, from Pond #4 inside her property line without any permission whatsoever!! This corner of her property is not assigned to any road easements, as it is detached from Holly Drive by a