1808 MERRILL CREEK PKY 2016-01-01 MF Import

. '. E-3592•610 Omniplan page 9 C�r`" July 9, 1996 Site Draina4e Since tho site is going to be raised thirty l30) to forty (401 feet, we do not expect the groundwater seepa�� will present any major construction-releted Issues. How�ver, if seepage is encountered in foundation or grade heam excavations durinfl constructlon,the bottom of the excavatlon should be sloped to one or more shallow sump plts. The collected water can then he pumpcd from these pits to a positive and permane�t discharfle, such as a nearby storm drain. Ourinq construction, the site must be graded such that surfaco water is diracted off the slte. Wator must noc be allowed to stand in any area where bulldfngs, slabs or pavements are to be constructed. loose surfaces shouid ba sealed at night by compacting the surface to reduce the potential for moisture inflltration into the soils. Final site grades must allow for drainage away from the huilding foundations. The ground should be sloped at a �r8dient of three percent for a distance of at least ten f8et away from the buildinc�s, except in paved areas, which can be sioped at a flradient of two ' percent. � Footinfl drains should he Installed around the bullding perimeter, at or just below the invert of the footinc�, with a gradient sufficient to initiate flow. A tYpical detail is provided on Plate 2. Under no circumstances should roof downspout drain lines be connected to the fovting drafn system, All roof downspouts must bc separately tightllned to discharge, Cleanouts should be Installed at strategic locations to ailow for periodle maintenance ot the footing drain and downspout tlghtlins systems. p�vemen�eas The adequacy of sito �avements is related in part to the condition of the underlying subgrade. To providv a properly prepared subgrade for pavements, the subgrade should be treated and prepared as described in the Slte Preparation sectlon of this roport. This means at le�st the top twelve 1121 inches of the subgrade should be ogg bpe that some porcent of the maxirnum dry density Iper ASTM D-1557-781� It is p localized areas of soft, wet or unstable subgrade may still exlst afte� thls process, Therefore, a �reator thickness of structural fill or crushed rock rnay 0e needed to stahilize these localized areas. Euth Camultenl�. Inc•