07/15/2004 Env Bd Packet - Laserfiche WebLink

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flow control and water quality are enhanced by flow dispersion through duff, undisturbed soils, and native vegetation. The preserved area will be clearly marked during clearing and construction on the site. This area will be delineated by heavy -duty silt fence. Care will be exercised to avoid damaging valuable trees and disturbing designated buffer zones. This area will remain in a natural state. The developer has reviewed the site a few times during the preliminary development stages and will continue to conduct tree preservation efforts with the City Forester. Covenants or easements will be used so property owners cannot clear vegetation in the preservation area. Monuments will be posted delineating this area. Drainage from the rear of the homes will travel through this area allowing infiltration and reducing runoff. • Rock construction entrance pads will be installed for each individual lot at time of lot grading. The purpose of the stone pads is to provide an area where mud can be removed from tires before a vehicle leaves the site. • One of the major pollutants associated with single - family home development is the use of phosphorous fertilizer and its runoff into nearby waterways. This development will require that no phosphorous be applied to the lawns and this requirement will be administered through the homeowner covenants. • On -lot infiltration systems will also be implemented. On -lot infiltration systems promote infiltration at the individual lot level, controlling runoff at its source. On -lot infiltration systems' primary function is to mitigate the normal impacts of urbanization on the natural water balance. These systems include several elements: • Each lot will be individually custom graded and tailored to preserve quality trees. Recognizing the value of the tree stands, the location of the houses will be designed to minimize impacts to the existing topography so that trees can be preserved between the homes. The developer has utilized this approach in the previous Pheasant Hills Preserve developments. • Roof leaders will be directed away from impervious services. This will reduce the volume of runoff from the site. • Rainwater gardens will be constructed in individual lots as feasible. Rainwater gardens are small, vegetated depressions used to promote infiltration of stormwater runoff. Runoff enters the gardens via sheet flow. Rainwater gardens will be placed along the front yard swale to capture runoff from streets and lawns and filter it before it enters the wet pond. • On the island, a wet /dry swale will be provided along the north side of the road in lieu of storm sewer piping. The road will be constructed without curb and gutter and tipped so runoff from the road will go to the swale. This swale will drain to the NURP ponds located on the east and west side of the island. The swale will be constructed directly within the existing soils. The swale will provide water quality treatment mechanisms Environmental Assessment Worksheet Page 9 Pheasant Hills 12th Addition