859 LOCUST ST 2022-07-20 - Laserfiche WebLink

OPERATIONS & MAINTENANCE CHECKLIST Project: Grandview Apartments Clubhouse Inspector: Date: Time: Facility Description: Stonnwater flow control for this site is provided by a bioretention cell located on the west side of the clubhouse building. Stormwater runoff from the parking lot will sheet flow west and into a drainage swale located along the proposed sidewalk west of the parking area. Stormwater within the swale will flow north towards the clubhouse building and shall be captured within a 12-inch area drain with an atrium grate. The wall drain for the proposed lock-block wall on the east side of the parking lot will also drain to this point via 4"PVC pipe. Stormwater collected within the area drain shall be conveyed west to rain garden which shall be placed along the east side of the clubhouse building. Stormwater runoff from the clubhouse roof shall also be conveyed to the rain garden from the roof downspouts. The rain garden has been designed to provide 6 inches of ponding depth before overflowing into the Type 1-L catch basin with beehive grate. A 6-inch underdrain is placed in a drain rock layer beneath the soil media so that excess stormwater within the soil will also be routed to the Type 1-L catch basin. Stormwater collected within the catch basin will flow north via 6" PVC pipe and into the combined sewer conveyance system located on site. As this system is being routed to a combined sewer system, the Type 1-L catch basin located within the rain garden shall be equipped with a floatable material separator and gas trap. The 2012 Stormwater Management Manual for Western Washington outlines maintenance standards in Volume V, pg. 4-32, Table 4.5.2 identifies and describes maintenance tasks and frequency needed and are included in this O&M Manual following this checklist. Overall Need Site Facilities Condition Repair? Comments/Observations GFPYN Catch Basins I s i 1 .- p- Bioretention Facility Conveyance Storm Pipes i-- f I i Facility Discharge Points G=Good F=Fair P=Poor Y=Yes N=No N/A=Not Applicable Will existing Site Facilities need to be repaired, cleaned or maintained? 1— YES I— NO IF YES, list the action items to be completed on the following table: Actions to be Completed Date Completed/ Initials 1. 2. 3. 4. 5.