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TECHNICAL MEMORANDUM <br /> July 13, 1995 <br /> Page 18 <br /> Table 3 -8 Standard Erosion Control Measures (continued) <br /> Type of Control Discussion <br /> Erosion blankets Used in areas where soil is highly erodible and vegetative <br /> methods cannot be achieved. Are often used with mulches. <br /> Structural Control Measures —Sediment Traps <br /> Check dams Nonpermeable structures constricted in ditches to reduce <br /> velocities and trap sediment. Similar in function to permeable <br /> benns. <br /> Sedimentation ponds Larger structures designed to trap sediment. Ponds are used for <br /> treating larger areas of runoff where others methods are <br /> inadequate. <br /> Construction Entrances <br /> Gravel pads Gravel is used at the entrance /exit of construction sites to reduce <br /> trackout of mud and sediment onto city streets. <br /> Wheel wash pads Wash pads can be constructed with the gravel entrance /exit pads <br /> to allow washdown of wheels. <br /> Coverings <br /> Plastic covers Plastic sheets can be used to cover erodible surfaces and <br /> stockpiles of soils. <br /> Maintenance - Related Criteria <br /> Maintenance of the storm drainage system is critical for proper operation of the system. The <br /> type and frequency of maintenance directly affect both water quantity and water quality <br /> functions of the system. The Comprehensive Maintenance Plan developed in conjunction <br /> with this project provides more detail into the type and frequency of maintenance required for <br /> proper operation of the city -owned drainage system. The focus of the following discussion is <br /> on the maintenance of privately owned facilities. <br /> Currently, the city has the authority and responsibility for maintaining city -owned stormwater <br /> facilities." Tie responsibility for maintaining privately owned facilities is not clearly <br /> delineated in the city code. Yet, the operation of privately owned facilities can directly affect <br /> flooding and water quality in downstream receiving waters owned and maintained by the city. <br /> The city should consider taking a more direct role in the inspection and, possibly, the <br /> maintenance of privately -owned facilities. <br /> ): \21 19rrask3Vm31.eu DRAFT <br />