5402 S 1ST AVE 2022-05-23 - Laserfiche WebLink

• 4) Planting beds shall be mulched with 2 inches of organic material. On sheet 5/6,two areas are labeled as "R1", and all the R1 area is not shown in the area tables. This sheet needs to be corrected/clarified. The flow arrows on the east side of the rear planting strip are shown going in opposite directions on sheets 2 and 3. The report states that the southwesterly property line is being used for dispersion of roof runoff. However on sheet 2 there doesn't appear to be a way for runoff to enter the shallow swale along the southwesterly property line—no curb cuts are called for and the only apparent inlet is at the northwest corner of the site, into a designated bioretention area. Any areas being used for the dispersion of roof runoff in order to meet MR#5 requirements must be clearly delineated. The topographical contours shown on sheets 2 and 3 appear to be the existing contours for the site—they do not match the proposed spot elevations given for the new pavement, or the flow arrows shown. In order to minimize confusion, the existing contours should be removed from the drawings showing the redeveloped site. The center bioretention area should be relocated to the southwest to avoid conflicts with the crossing of the footing drains. If this isn't possible, the grate elevation of the catch basin with construction note 21 must be elevated 6" above the top of the overflow grate elevation from the bioretention area. Because City standard structures and lids are not being used, please also specify a solid cover for the catch basin with note 21. Once the predeveloped condition is modeled as forested, it will be difficult to meet the required flow control requirements for the site with the allowable minimum orifice size of 0.5 inches. Therefore any bypass area shall be minimized and all roof runoff directed to the flow control facility. s:\jzimmerm\word\pr_8417 Evg Way