3301 LOMBARD AVE COMPASS HEALTH SUPPORTIVE HOUSING 2022-02-18

STORM DRAINAGE OPERATIONS & MAINTENANCE MANUAL JULY 8, 2019 COMPASS HEALTH SUPPORTIVE HOUSING INTRODUCTION This Operations and Maintenance Manual provides detailed information and guidelines on the proper maintenance of the on -site storm drainage system. The Manual has been based on the requirements of the 2012/14 Department of Ecology Stormwater Manual (DOE Manual). Inspection and maintenance requirements may change in the future, and this manual does not exempt this facility from any future changes in inspection and maintenance requirements. The record documents should be consulted during inspection, maintenance and repair activities; a copy of the record documents is kept at the City of Everett as well as on -site. DRAINAGE NARRATIVE The site is located with a combined sewer area in the City of Everett. Drainage from the roof is collected internally to the building and directed to the detention pipe located below the patio area. The patio runoff is collected in a yard drain and conveyed to the detention pipe. The controlled release is then directed to the sanitary sewer in the adjacent alley. FACILITY MAINTENANCE RESPONSIBILITY Compass Health and its successors and assigns are the responsible party for maintenance of the private storm drainage systems. This includes all storm systems that lie within the property boundary, including the yard drains and storm pipe, the detention system and the flow control structure. FACILITY DESCRIPTIONS The following are drainage items in this system and a description of their function: Storm drainage pipe: Conveys runoff underground from one point to another. On this site, storm drainage piping ranges in size from 6-8" PVC for roof and patio drain collectors. Catch Basins: A structure used to collect surface water and direct it to a storm drainage pipe. They can also be used junctions betweens runs of storm drainage pipe. Catch basins are larger concrete structures; rectangular or round. Detention Tank/Control Structure: The underground detention pipe consists of 8' diameter CMP pipe and in conjunction with a flow control manhole temporarily stores and releases runoff to mitigate increases in runoff flows. MAINTENANCE REQUIREMENTS The text below provides general guidelines for the maintenance of facilities and a description of specific requirements for on -site facilities. Where applicable, the standard DOE Manual maintenance standards are referenced. The DOE Manual can be located on-line for reference at the Department of Ecology website. PAWork\Projects\2017\17-125 Environmental Works\CE\D0GS\17-125 Meadow Wood O-M Manual.docx DWH/srm