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I <br /> 1 Section 1 - 2016 Surface Water Design Manual <br /> 1 NO.3—DETENTION TANKS AND VAULTS <br /> Maintenance Defect or Problem Conditions When Maintenance is Needed Results Expected When <br /> Component Maintenance is Performed <br /> Site Trash and debris Any trash and debns which exceed 1 cubic toot Trash and debris cleared from site. <br /> per 1,000 square feet(this is about equal to the <br /> amount of trash it would lake to fill up one <br /> standard size office garbage can). In general, <br /> there should be no visual evidence of dumping. <br /> I Noxious weeds Any noxious or nuisance vegetation which may Noxious and nuisance vegetation <br /> constitute a hazard to County personnel or the removed according to applicable <br /> public. regulations. No danger of noxious <br /> vegetation where County personnel <br /> or the public might normally be. <br /> Contaminants and Any evidence of contaminants or pollution such Materials removed and disposed of <br /> pollution as oil,gasoline.concrete slurries or paint according to applicable regulations. <br /> Source control BMPs implemented it <br /> appropriate. No contaminants <br /> present other than a surface oil film. <br /> Grass/groundcover Grass or groundcover exceeds 18 inches in Grass or groundcover mowed to a I <br /> height. height no greater than 6 inches. <br /> Tank or Vault Trash and debris Any trash and debns accumulated in vault or tank No trash or debris in vault <br /> Storage Area (includes floatables and non-floatables). <br /> Sediment Accumulated sediment depth exceeds 10%of the All sediment removed horn storage <br /> accumulation diameter of the storage area for%length of area. <br /> storage vault or any point depth exceeds 15%of <br /> diameter. Example 72-inch storage tank would <br /> require cleaning when sediment reaches depth of <br /> 7 inches for more than%length of tank <br /> Tank Structure Plugged air vent Any blockage of the vent Tank or vault freely vents. <br /> I Tank bent out of Any part of tank/pipe is bent out of shape more Tank repaired or replaced to design. <br /> shape than 10%of its design shape. <br /> Gaps between A gap wider than'A-inch at the joint of any tank No water or soil entering tank <br /> sections.damaged sections or any evidence of soil particles entering through joints or walls <br /> joints or cracks or the tank at a joint or through a wall. <br /> tears in wall <br /> Vault Structure Damage to wall, Cracks wider than'/-inch,any evidence of soil Vault is sealed and structurally <br /> frame,bottom,and/or entering the structure through cracks or qualified sound. <br /> lop slab inspection personnel determines that the vault is <br /> not structurally sound. <br /> I InleVOutlet Pipes Sediment Sediment filling 20%or more of the pipe. Inlet/outlet pipes clear of sediment. <br /> accumulation <br /> Trash and debris Trash and debris accumulated in inlet/outletNo trash or debris in pipes. <br /> pipes(includes floatables and non-floatables). <br /> Damaged Cracks wider than h-inch at the joint of the No cracks more than%-inch wide at I <br /> inlet/outlet pipes or any evidence of soil entering the joint of the inlet/outlet pipe. <br /> at the joints of the inleVoutlel pipesIII . <br /> NO.3—DETENTION TANKS AND VAULTS <br /> Maintenance Defect or Problem Conditions When Maintenance is Needed Results Expected When <br /> Component Maintenance Is Performed <br /> I Access Manhole Cover/lid not in place CoverAd is missing or only partially in place. Manhole access covered. <br /> Any open manhole requires immediate <br /> maintenance. <br /> Locking mechanism Mechanism cannot be opened by one Mechanism opens with proper tools. <br /> I not worlung maintenance person with proper tools.Bolts <br /> cannot be seated. Self-locking cover/lid does not <br /> work <br /> Cover/lid difficult to One maintenance person cannot remove Cover/lid can be removed and <br /> remove coverPod after applying 80 lbs of lift. reinstalled by one maintenance <br /> person. <br /> Ladder rungs unsafe Missing rungs,misalignment,rust,or cracks. Ladder meets design standards. <br /> Allows maintenance person safe <br /> access. <br /> Large access Damaged or difficult Large access doors or plates cannot be Replace or repair access door so it <br /> doors/plate to open opened/removed using normal equipment. can opened as designed. <br /> Gaps,doesn't cover Large access doors not Bat and/or access Doors close fiat and covers access <br /> completely opening not completely covered opening completely <br /> Lifting Rings missing. Lifting rings not capable of lifting weight of door Lifting nngs sufficient to lift or <br /> rusted or plate. remove door or plate <br />