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� <br /> � BMNs for llescription uf Yollutant tiourccs: Fa�ifitirs �ncludc ru:id�idc catch <br /> Nlaintenance of basins on arterials and ���ithiu residenu:�l arca;, convevance s�stcros. <br /> � Stormwafer dctcntion f�ciliucs such as pond� and ��aults, oil and watcr scparat<�rs. <br /> Drainage and biofilters, settling hasins, mtilVatiun s��stcros, and all othcr t}pes of <br /> Treatment s!nrn����ater [reatment systems presented in Yolume V. Roadside ca�ch <br /> � Systems basins can rcmo��c fi'om 5 to 15 percent of the pollutants present in <br /> ;tonnti�ater. \�1�hen c�tch basins are about 60 percent fuU of sediment, thcy <br /> ce�sc removing sediments. Oil and grease, hydrocarbons, debris, hcavy <br /> ' metals,sediments and contaminated water are found in catch Uasms, oil <br /> ano water separarors, settling besins, etc. <br /> � Pollutant Control .4ppra•rch: Pro��ide maintcnance and cicaning of <br /> debris, sediments, and oil from stonnwater collection, conveyance, and <br /> trcatmcn� systems to oUtain proper operation. <br /> tApplicablc Operational li�'[Ps: <br /> ' f�7aintain stomiwater treatment facilitics according ro the O Rr M <br /> procedures presented in Scction 4.6 01'Volume V, in addition to the <br /> f'ollowing BMPs: <br /> ` • Routinely inspect and document the cundition of all stonnuaier <br /> facilities cvcry si� months, heFore and after thc wct scason. Also, <br /> � inspect all lacilitics immcdiately following significant rainfall c�ents. <br /> • Clean trcatment BMPs, conveyance systems, and catch basins as <br /> necded, and detem»ne wheAier improvements in O & �•1 are nceded. <br /> I • Promptly rcpair any deterior�tion thrcatcning the structural iutce�ity uf <br /> the facilities. These indude rcplacement ofdean-out gates, catch <br /> I hasin lids, and rock in cmcrgency spillways. <br /> • L'nsure that storm se�ver capacities arc not exceeded and that heavy <br /> seJiment discharges to the sew�er system are prevented. <br /> L • Itegularly remove debris and sludge from BMPs used for peak-ratc <br /> conhol, treatment, etc. and discharge to a sanitary sewer iFappr,:ved <br /> by the sewer authority, or truck to a local or state govemment <br /> Iapproved disposal sitc. <br /> • Clean catch basins when the depth of deposits reaches 60 perecnt of <br /> I the sump depth as measured from the bottom of basin to the im�ert of <br /> the lowest pipe inro or out of tl�e basin. 1{owever, in no case should <br /> thcre be less than si�: inches clearance from the debris surface to the <br />� I inven oC the lowest pipe. Some catch h:,s�nc lfor example, WcL1pT <br /> Type 1 L basins) may have as little as 12 inclies sediment storagc <br /> below the invert. These catch basins will ueed more frequent <br /> I2-42 Volume IV— Source Control(Pollution Prevention) BMPs January 2005 <br /> I <br /> I 16L <br />