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, <br /> � O� <br /> O O <br /> � � <br /> CITY of ORONO <br /> ti <br /> ��� �G~' RESOLUTION OF THE CITY COUNCI L <br /> `9kESI�Og' NO. g � 1 '� <br /> of house and driveway which allows for an unusually substantial area of lawn in the <br /> runoff flow path for infiltration. In order to avoid filling in the 0-75'zone to <br /> accommodate the driveway, the applicant was approved for a retaining wall <br /> adjacent to the driveway. <br /> b) Now that the house is completed and final grades established, applicant has <br /> concerns about the necessary height of the retaining wall. S afety is the primary <br /> factor which supports eliminating the wall.The wall as approved was at the edge <br /> of the driveway,with an immediate drop of 2.5',then a 1:1 downslope for another <br /> 3-4',with gradual slope after that. The driveway functionally is about 6'above <br /> original grade at this point,and filling/grading would have stopped at the 75' <br /> setback line.This immediate grade change in an area that wiil have pedestrian <br /> traffic, children playing, etc. is less than ideal. <br /> c) The visual impacts of the wall would be primarily as it is viewed from the lagoon. <br /> Grading the slope and vegetating it will provide a softer and more natural view <br /> from the lagoon than a 64'long, 2'-6"high wall.The driveway itself will be only <br /> minimally visible from the lagoon regardless of whether the wall is built. <br /> d) Creating a 3:1 slope from the diiveway(elev.942')to the existing grade(934�will <br /> eliminate 64'of retaining wall,or approximately 50-60 s.f.of hardcover,which will <br /> allow for a better situation in terms of runoff. The trade-off is that rainfall that <br /> would have fallen on a relatively flat lawn surface at the base of the wall,will now <br /> fall on a slope and be somewhat more prone to run off than soak in during certain <br /> storm events. To mitigate any negative runoff impacts that might be created by the <br /> increased slope in the 0-75'zone,a 5-10'wide vegetated border/buffer should be <br /> established at the base of the slope. This area shoUld be maintained in high grasses <br /> or other vegetation which will allow for greater infiltration in this area. <br /> e) Because City code requires finish grades to be 3:1 or flatter,the 8' total drop <br /> translates to a 24'wide slope about 80'in length.Total fill needed for the project <br /> is approximately 250 cubic yards. <br /> Page 2 of 5 <br />