2018.05.21 CC packet - Laserfiche WebLink

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April 12, 2018 Page 2 8,976 sq. ft. The 65 ft. wide single family lots have a min lot size is 8,600 sq. ft. with an overall average of 10,288 sq. ft. Capstone Homes is intended to be the builder of these homes. Capstone has provided a portfolio of home designs for each dwelling type. The reduced setbacks requested on the overall site to better meet density requirements. The setbacks proposed are 25 foot front, 25 foot front corner lot, 7.5 foot sides and 30 foot rear. The Concept review staff report pointed out concerns for mix of product on the east side of Oneka Parkway and to reevaluate the mix to ensure there is an appropriate transition. To this point more 65 ft. wide single family lots were inserted to minimize the "pockets" of Villas among the single family home. The current proposed inventory of each product is a shown below. Summary Total Lots all Phases Before #Units Now #Units Difference #Units 65' lots - Capstone 41 71 30 55' — 60' Villas/SF - Capstone 67 38 -29 70' SF, west of Oneka 69 68 -1 Totals 177 177 0 UTILITIES: Municipal Sanitary Sewer and Water Main are stubbed to the south end of the project. The project will extend these municipal services with each phase in accordance with city engineering specifications and detail plates. SITE GRADING AND STORM WATER MANAGEMENT: Initial soil borings indicated high perched groundwater conditions throughout the site. The time of the year the borings were taken was March which may attribute to the high perched water conditions (frozen ground below the surface) Perched water conditions are nothing new to Hugo sites. The city's engineering standard requirement building minimum lowest floor elevation of 3 feet above the 100 year flood elevation of ponds/wetlands and 4 ft. above the ground water. As a result, the site would require significant fill material to raise building pads above the wetlands and/or perched water. The fill material needed is either mined with storm water pond construction which then the ponds tend to be deeper than necessary, or material is imported at a significant cost. To provide the margin of safety the city requires for the groundwater or perched water conditions, an area hydrologist Mr. Ken Meeks, was employed to perform additional borings to 40 ft. depth to determine actual groundwater conditions. The groundwater Investigation study completed provides a wealth of data. In conclusion, the study indicates that a four foot separation exists between the groundwater elevations and proposed lowest floors. Perched water conditions are present and exist due to the tight soil conditions. As noted in the conclusion of the report "Basement sump pump systems are recommended for all homes on 2