03/27/2002 Env Bd Packet - Laserfiche WebLink

Home Search

Agenda Item 5A Environmental Board Meeting Date: March 27, 2002 Topic: Stoneybrook/Preliminary Plat/Site Plan Review Background: Stoneybrook is a 78 Acre Parcel of Land located on the South side of Birch Street, just West of Centerville Road. Figure 1. This property is guided for low- density sewered residential development in the City's Comprehensive Plan, and planned as a future growth area. The developer is requesting MUSA allocation, and formal rezoning of the property from R -Rural to R -1 x -Low Density Residential. The developer requests approval for a 111 -lot subdivision. Preliminary Plat information is included as Figure 2. The site contains approximately 19.2 acres of wetland, and 58.87 acres of upland. Of these 19.2 acres of wetland, 2.06 acres will require mitigation. The developer proposes to accomplish this on site. Analysis: This is a very wet site. Although soils on this site for the most part have moderate filtration capacity, a good amount of them are hydric, water saturated, in spite of historic artificial drainage. Figure 5 and 6. Because of this saturated nature of the soils, infiltration techniques are limiting. Attention can be given to water quality design. Water basin areas should be protected from compaction and planted with a buffer of native plants. Basin filtration capacities could be enhanced with organic bed establishment in flow areas. Most of the site surface water is in the Rice Creek Watershed District and travels to Wards/Reshaneau Lakes. A small portion of the Preliminary Plat on the South Comer is in the Vadnais Lake Water Management Area. Figure 7. Stoneybrook soils for the most part are glacial till, yellow brown, and oxidized. Oxidized means the soils have been water saturated. The soils are also very insensitive to ground water pollution, except for a small section on the South East comer that is in the Vadnais Lake Area Watershed District. Figure 8. Soil compaction is problem on all construction sites. Maintaining natural surface and ground water is important and though these soils are saturated, care must be given to minimize additional water volume discharges. Yard areas where possible, and wetland areas, natural or created, should be protected from construction traffic and fenced off. A sequencing plan and management plan should be submitted. The management plan should include a 3 -year contract with a landscape company knowledgeable and experienced in native vegetation management. Seed mixes should be consistent with the City of Lino Lakes seed mixtures. Escrow dollars should be received ensuring native mix and maintenance compliance. No soils should be hauled off the site or brought on to the site with out permission from the City of Lino Lakes. All soils if brought in must be consistent with existing soils. Management plan should specifically state the preexisting soil conditions,