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i' <br /> 3 <br /> • Washout of concrete trucks shall be performed in designated areas <br /> only. <br /> j Concrete washout from concrete pumper bins can be washed into <br /> concrete pumper trucks and discharged into designated washout area <br /> _. or properly disposed of off-site. <br /> I. is Once concrete wastes are washed into the designated area and allowed <br /> to harden,the concrete should be broken up,removed, and disposed of <br /> per applicable solid waste regulations. Dispose of hardened concrete <br /> <: on a regular basis. <br /> • Temporary Above-Grade Concrete Washout FacilitX <br /> • Temporary concrete washout facility(type above grade) should be <br /> constructed as shown on the details below, with a recommended <br /> it. minimum length and minimum width of 10 ft,but with sufficient <br /> quantity and volume to contain all liquid and concrete waste <br /> generated by washout operations. <br /> Plastic lining material should be a minimum of 10 mil <br /> polyethylene sheeting and should be free of holes, tears, or other <br /> defects that compromise the impermeability of the material. <br /> f <br /> Temporary Below-Grade Concrete Washout Facilijy <br /> • Temporary concrete washout facilities(type below grade) should <br /> be constructed as shown on the details below, with a recommended <br /> minimum length and minimum width of 10 ft. The quantity and <br /> volume should be sufficient to contain all liquid and concrete <br /> a waste generated by washout operations. <br /> i <br /> Lath and flagging should be commercial type. <br /> E - <br /> Plastic lining material shall be a minimum of 10 mil polyethylene <br /> sheeting and should be flee of holes, tears,or other defects that <br /> compromise the impermeability of the material. <br /> Liner seams shall be installed in accordance with manufacturers' <br /> recommendations. <br /> f <br /> Soil base shall be prepared free of rocks or other debris that may <br /> cause tears or holes in the plastic lining material. <br /> Mahitenance Inspection and Maintenance <br /> Standards <br /> • Inspect and verify that concrete washout BMPs are in place prior to the <br /> commencement of concrete work. <br /> • During_periods of concrete work, inspect daily to verify continued <br /> performance. <br /> r • Check overall condition and performance. <br /> ! <br /> Check remaining capacity(% full). <br /> Fohnne II—Construction Slornnvaler•Pollution Prevention-August 2012 <br /> 4-49 <br /> , i <br />