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KLE/NFELOER <br /> �Bright People.Right Solutions. <br /> the top edge of the bioswale/drainage area excavation for every 1 foot of vertical bioswale <br /> depth, or <br /> • Concrete curbs for pavements, or lateral restraint for exterior flatwork, located directly <br /> adjacent to a vertical bioswale cut should be designed to resist lateral earth pressures or <br /> concrete curbs or edge restraint should be adequately keyed into the native soil or <br /> engineered fill to reduce the potential for rotation or lateral movement of the curbs. If curbs <br /> are already underlain by lime treated soil that extends 2 feet beyond the curb we <br /> recommend that the edge of lime treated soil be buried within the swale rather than <br /> removed. <br /> Additionally, if trenches are proposed for placement within or near bioswales, Kleinfelder should <br /> be made aware so that we may review and provide guidance regarding compaction criteria for <br /> trenches. <br /> 5.11 SITE DRAINAGE <br /> Foundation and slab performance depend greatly on how well runoff water drains from the site. <br /> Accordingly, positive drainage should be provided away from building pad and pavement areas <br /> toward appropriate drop inlets or other surface drainage devices without ponding. In general, we <br /> recommend consideration be given to providing at least 1 to 2 percent slope away from structure <br /> foundations or access ways for drainage. The drainage should be maintained both during <br /> construction and over the life span of the project. Roof draining should be installed with <br /> appropriate downspout extensions out falling on splash blocks so that water is directed a minimum <br /> of 5 feet horizontally away from the structures or be connected to the storm drain system for the <br /> development. <br /> A number of post-construction landscape practices beyond the control of the design engineers <br /> can occur to cause distress to pavements founded on expansive clay. Potential man-made water <br /> sources, such as buried pipelines, drains and the like, should be periodically tested and/or <br /> examined for signs of leakage or damage. Any such leakage or damage should be promptly <br /> repaired. <br /> 20210067.001A/ST020R111447 Page 33 of 37 May 11, 2020 <br /> ©2020 Kleinfelder www.kleinfelder.com <br />