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9/3/81 - Silver Lake Wood Development -4- <br /> III. Summary and Recommendations <br /> 1. All exposed soils should be vegetatively stabilized as soon as possible <br /> following rough grading. It would be advisable to limit exposure to only those <br /> sites being developed at any given time. The sandy fine texture of the soils <br /> make for extreme wind erosion potential. It should be noted that the only <br /> successful means of controlling wind erosion is to limit soil exposure. Suggestions <br /> for temporary and permanent vegetative covers are given in Appendix B. <br /> 2. Development of Tract F will require excavation of organic soil material and <br /> replacement with suitable mineral soil material. It is recommended that replaced <br /> soils be allowed to settle one year prior to development. <br /> 3. The proposed holding pond and corresponding outlet structure in Tract F <br /> should have adequate capacity to handle a 100 year storm. <br /> 4. All overland flows be kept below 4. 5 cfs to maintain vegetative cover. <br /> 5. Ponding area slopes of Tract F be stabilized as soon as pond excavation <br /> is complete. <br /> 6. All storm sewer inlets should be protected by hay bale dikes or other <br /> suitable filter dikes during project development phases. Suggestions for <br /> filtering dikes are given in Appendix C. <br /> 7. Sodded, drainage swails should be constructed as soon as possible in Tract <br /> D to act as filter strips. <br /> 8. Roadways and curbing should be installed prior to site construction. A <br /> narrow sodded filter strip would be advisable adjacent to roadways. <br /> 9. All storm sewer outlets should have stable spillways to eliminate scouling. <br /> 10. The use of hay bales or other suitable sediment dike measures are necessary <br /> along the entire perimeter of the park ponding area. <br /> 11. The landscaping and development of the proposed pond and park must be done <br /> in stages to eliminate the exposure of large areas. <br /> 12. The importance for adequate soil cover cannot be over stressed. Rough <br /> calculations using the universal wind loss equation indicates that up to 10.8 <br /> tons of soil per acre per year could be lost. This would translate to approx- <br /> imately 60 20-yard dump trucks per year if the entire site were left bare. <br /> 13. Appendix D lists the potential seed mixtures for the park and commons <br /> areas of the plat. <br /> If you have any questions regarding erosion control and terf establishment, <br /> please contact the Ramsey Soil and Water Conservation District Office. <br /> Sincerely, <br /> Yis-1-;-avt2 <br /> Tom Petersen, Conservation Specialist <br /> Enclosure <br />