06/12/2024 ZONING BOARD OF APPEALS Minutes (2)

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Page 17 First Defense®Operation and Maintenance Manual l=laatables and Sediment Clear? Out Procvdcrre, 1. Set up any necessary safety equipment around the access port or grate of the First Defense®as stipulated by local ordinances. Safety equipment should notify passing pedestrian and road traffic that work is being done. 2. Remove the grate or lid to the manhole. . Without entering the vessel, look down into the chamber to inspect the inside. Make note of any irregularities. 4. Remove oil and floatables stored on the surface of the water with the vactor hose or with the skimmer or net . Using a sediment probe such as a Sludge Judge®, measure the depth of sediment that has collected in the sump of the vessel and record it in the Maintenance Log (page 9). B. Once all floatables have been removed, drop the vactor hose to the base of the sump. Vactor out the sediment and gross debris off the sump floor 7. Retract the vactor hose from the vessel. B. On the Maintenance Log provided by Hydro International, record the date, unit location,estimated volume of floatables and gross debris removed,and the depth of sediment measured. Also note any apparent irregularities such as damaged components, blockages, or irregularly high or low water levels. 9. Securely replace the grate or lid. Maintenance at a Glance Inspection - Regularly during first year of installation -Every t riwinths after the first year of installation Oil and Floatables -Once per year,with sediment removal Removal - Following a spill in the drainage area Sediment Removal -Once per year or as needed - Following a spill in the drainage area ... .... �...._ .. ....... .. .. ... .............. NOTE: For most clean outs the entire volume of liquid does not need to be removed from the manhole. Only remove the first few inches of oils and floatables from the water surface to reduce the total volume of liquid removed during a clean out.