CCP 04-17-2000 - Laserfiche WebLink

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. . . 6) Review Maintenance Procedures Grit Chambers The City has several grit chambers. which are devices which act like a drain trap. Rapidly flowing water is captured and slowed by a baffle design which allows some sediment to settle out during low flow rain fall events. The more sediment that collects in the trap the less effective the device becomes in terms of water quality control because succeeding rain events re- suspend trapped material and move it rapidly into the receiving water body. Other maintenance procedures have similar goals. which are to minimize the amount, timing and quantity of sedi- ments that carry pollutants into the cities many water- bodies, 6)Recommendation: Maintain all city sediment collection and water quality control features on a regular schedule. Continue to do timely street sweepings and identify areas most impacted by winter season street runoff. Method/lmplementation: Implement maintenance proce- dures on selected structures and develop a regular schedule of maintenance, Integrate Best Management Practices (per Water Management Plan) into all City maintenance and repair projects. Monitor grit chambers and sediment ponds for sediment build up and plan a cleaning protocol to ensure effective operation. Identify sediment structures that are a City responsibility, De- velop a test procedure with RCWD engineers or others and provide maintenance on an appropriate schedule, Prioritize areas subject to winter salVsand residue and provide additional buffering for times when street sweep- ing cannot be done in a timely manner such as early Spring thaw seasons. Costs/resources: May involve additional scheduled staff time and engineering, May involve operations committee review. May involve some staff training, Relative cost - Low