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Future Business Park <br />6/26/2015 <br />Page 4 <br />The ponds as laid out in this report indicate areas that are best suited for regional rate control basins only. <br />It is recommended that additional design parameters and regional stormwater management planning be <br />further refined as the areas begin to develop. These may include the following. <br />• Create regional facilities that accommodate rate control, water quality, and volume reduction and <br />assess property owners to alleviate the City's upfront investment. <br />• Develop drainage and utility easements for the required pond foot print for ultimate build -out and <br />require the developer to increase the size of the basin based on a percentage of developed area <br />and/or impervious surface. <br />• Establish maximum rates of impervious surface construction per land use. Anything above those <br />rates would have to accommodate rate control, water quality, and volume reduction on site. <br />• Trunk storm sewer lines should also be preliminarily sized to serve future development, routed to <br />regional pond locations, and dedicated to drainage and utility easement. <br />Cost estimates have not been developed for the regional pond construction or internal site storm sewer <br />conveyance. It is anticipated that costs associated with pond construction will be determined by the <br />developer as site grading. Also, it is assumed that internal drainage will be accommodated by dry swales <br />and ditch systems to reduce storm sewer costs. <br />We appreciate the opportunity to present this preliminary report of findings. If you have any questions, <br />please contact me at 651-704-9970 or timol@bolton-menk.com at your convenience. <br />Sincerely, <br />BOLTON & MENK, INC. <br />Timothy J. Olson, PE, CFM <br />Water Resources Project Manager <br />