9227 4TH AVE W 2024-08-12 - Laserfiche WebLink

Table V-A.7: Maintenance Standards-Energy Dissipators Maintenance Com- Defect Conditions When Maintenance is Needed Results Expected When Maintenance is Porten Performed Extemal: Missing or Moved Rock Only one layer of rock exists above native soil in area five square feet or larger,or any exposure of native soil. Rock pad replaced to design standards. Aaekii0d_ Erosion Soil erosion in or adjacent to rock pad- Rock pad replaced to design standards. Pipe Plugged with Sediment Accumulated sediment that exceeds 20%of the design depth. Pipe cleanedlFlushed so that it matches design. Not Discharging Water Property Visual evidence of water discharging at concentrated points along trench(normal condition is a"sheet flow"of water along trench). Trench redesigned or rebuilt to starxiards. Intent is to prevent erosion damage. Dispersion Trench Perforations Plugged. Over 112 of perforations in pipe are plugged with debris and sediment Perforated pipe cleaned or replaced. Water Flows Out Top of"Distributor" Maintenance person observes or receives credible report of water flowing out during any storm less than the design storm or its causing Facility rebuilt or redesigned to standards. Catch Basin. or appears likely to cause damage. Receiving Area Over-Saturated Water in receiving area is causing or has potential of causing landslide problems. No dangerof landslides. 7RMRcr Worn or Damaged Post,Baffles,Side Structure dissipating flow deteriorates to 112 of original size or any concentrated wom spot exceeding one square foot which would of Chamber make structure unsound. Structure replaced to design standards. Other Defects See Table V-A-5:Maintenance Standards-Catch Basins See Table V-A.5:Maintenance Standards- Catch Basins BMP T5.12: Sheet Flow Dispersion Maintain 2-foot-wide transition zone to discourage channeling between the edge of the impervious surface (or building eaves) and the downslope vegetation. Maintain 10-foot-wide vegetated buffer and erosion of downstream areas. BMP T5.13: Post-Construction Soil Quality and Depth Establish soil quality and depth toward the end of construction and once established, protect from compaction, such as from large machinery use, and from erosion. Plant vegetation and mulch the amended soil area after installation. Leave plant debris or its equivalent on the soil surface to replenish organic matter. Reduce and adjust, where possible, the use of irrigation, fertilizers, herbicides and pesticides, rather than continuing to implement formerly established practices.