5.2. SR 10-18-2004 - Laserfiche WebLink

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Medical Professional Building/Phoenix Enterprises SepteDlber22,2004 Page 2 on the Coborn's site. A cross access agreement for parking and accessing the trash enclosure will be necessary. o The trash enclosure will need to be designed to not let water into it, but allow surface water to continue to flow to the existing catch basin. o The curb and gutter lines shown for the existing site to the west, the Valvoline Oil site, do not appear to be correct. The driveway appears to be actually located further south in line with the sewer and water services. This needs to be connected. o Sidewalk pedestrian ramps will need to be constructed at the access off of the service road in accordance with the City standard plate number 2004. 2. Grading and Erosion Control Plan o The grading and erosion control plan needs to be revised to reflect the changes in the revised site plan. o Catch Basin # 1 located northwest of the main building entrance is shown to have a rim elevation of 950.00. The catch basin forms a low point in the north portion of the parking lot. If the catch basin were to become plugged, there is no overland overflow route that would direct drainage away from the building. The parking lot grade should be revised to provide an emergency overflow, which will protect the building from flooding should the storm sewer catch basis become blocked. o The trash enclosure location is proposed in the route of the storm water overflow from the Coborn's parking lot. Additionally, the trash enclosure is shown to be constructed on top of an existing storm sewer line. The trash enclosure needs to be relocated to provide access for maintenance to the storm sewer line, and grading needs to indicate that the emergency overflow from the Coborn's parking lot will be maintained. o A six-foot high retaining wall is shown at the southeast corner of the proposed building. A building permit and an engineered design for this retaining wall will be necessary. o Because the site will disturb more than one acre of land, an NPD ES construction permit will be required. As part of that permit, a Storm Water Pollution Prevention Plan (SWPPP) will be required to be submitted and approved. The City has prepared a generic SWPPP which can be signed by the developer and utilized for the project. o Relative to erosion and sediment control, special attention needs to be focused on preventing silt from entering the existing ponding area to the south. A retaining wall surrounds the pond which will be make removing silt from the pond very difficult. If the site construction does discharge silt and other erosion to the pond, the owner of the medical professional building development will be held responsible to remove it. o Spot elevations shown on the grading plans are in the 800's and the contours shown are in the 900's. S:\PLAj\j}Tfi'.JG\C.lSe Files\2004\CU 04-27 Phoenix Emp\Engineer's memo 9-21-04.doc