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2 <br />3. Do not augment runoff to adjacent properties. If development associated with a <br />higher runoff coefficient (C'- value) than the originally anticipated value is proposed, <br />the augmented storm runoff will have to be mitigated. <br />4. Do not block runoff from adjacent properties. The drainage area map developed for <br />the hydrology design shall clearly indicate all areas tributary to the project area. <br />Adequate provision for silt and erosion control in both construction and post - <br />construction phases of development should be provided. Grading should be done in <br />accordance with grading, erosion and sedimentation control plans approved by the <br />City of San Leandro. <br />6. This office recommends that all storm drains be no less than 12- inches in diameter to <br />minimize maintenance problems. <br />7. All paved slopes should be a minimum of 0.5 %. <br />8. If a new storm drain connection is proposed to be made to the District facility, it will <br />need to be noted on the plans that: <br />An encroachment permit shall be obtained from AIameda County Flood Control <br />and Water Conservation District prior to commencement of any work within <br />District right of way and for the construction, modification or connection to <br />District- maintained facilities. All workmanship, equipment, and materials shall <br />conform to District Standards and specifications. <br />If you have any questions, please call me at (510) 670 -5209. <br />Very truly yours, <br />Ro e iV <br />As 'st De elopm Department <br />IRDL <br />