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OPERATIOhIS AND MAINTENANCE GUIDELINES Far the CQNTINUt~US DEFLECTIVE SEPARATIC3N UN[T INTRODUCTION The CDS unit is an important and effective component of your storm water management program and proper operation and maintenance of the unit are essential to demonstrate your compliance with local, state and federal water pollution control requirements. The CDS technology features a patented non-blocking, indirect screening technique developed in Australia to treat water runoff. The unit is highly effective in the capture of suspended solids, fine sands and larger particles. Because of its non-blocking screening capacity, the CDS unit is un-matched in its ability to capture and retain gross pollu#ants such as trash and debris. In short, CDS units capture a very ~~ide range of organic and in-organic solids and pollutants that typically result in tons of captured solids each year: total suspended solids (TSS~, sediments, oil and greases and captured trash and debris (including floatables, neutrally buoyant, and negatively buoyant debris} under very high. flow rate conditions. CDS units are equipped with conventional oil baffles to capture and retain oil and grease. Laboratory evaluations show that the GDS units are capable of capturing up to 74% of the free oil and grease from storm avater. CDS units can also accommodate the addition of oil sorbents within their separation chambers. The addition of the oil sorbents can ensure the permanent removal of 88% to 90% of the free oil and grease from the storm water runoff. OIaERATIONS The CDS unit is anon-mechanical self-operating system and will function any time there is flow in the storm drainage system. The unit will continue to effectively capture pollutants in flows up to the design capacity even during extreme rainfatl events when the design capacity may be exceeded. Pollutants captured in the CDS unit's separation chamber and sump will be retained even when the unit's design capacity is exceeded. CDS CLEANaUT The frequency of leaning the CDS unit wilt depend upon the generation of trash and de-.brie and sediments in your application. Cleanout and preventive maintenance schedules will be determined based an operating experience unless precise pollutant loadings have been determined. The unit should be periodically inspected to determine the amount of accumulated pollutants and #o ensure that the cleanout frequency is adequate to handle the predicted pollutant load- being processed by the CDS unit. The recommended cleanaut of solids within the CDS unit's sump should occur at 75% of the sump capacity. However, the sump may be completely full ~Nith no impact to the CD5 unit's performance. Access to the CDS unit is typically achieved through t,~~~Fo manhole access covers -one allows inspection and leanout of "the separation chamber (screenfcylinder} ~ sump and another allows inspection and deanout of sediment captured and retained behind the screen. The PS~lV ~ PSWC off-line models. have an additional access cover over the Exhibit B-1