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r.-: ~~,nn~F~ UPERATIUNS AND MAINTENANCE GUIf~ELINES For the DQNTINUt~US DE~LEGTtVE SEP~#R}kTlt)N C~NIT INTRQDUGTION The CDS unit is an irr~partant and effective component of your storm grater management program and proper operation and maintenance of the unit are essential to demonstrate your compliance ~.~vith lacy{, state and federal water pallutbn control requirements. The CDS technology features a patented non-blocking, indirect screening technique developed in Australia to trea# water runoff. The unit is highly effective in the capture of suspended solids, fine sands anti larger particles. Because of its non-blocking screening capacity, the CDS unit is un-matched in its ability to capture and retain grass pollutants such as trash and debris. In short, CDS units capture a eery .vide range of organic and in-organic solids and pollutants that typically result in tons of captured solids each year; total suspended solids {TSS). sedimen#s, ail and greases and cap#ured trash and debris (including floatables, neutrally buoyant, and negatively buoyant debris} under very high flo•Lv rate conditions. CDS units are equipped with conventional ail baffles #o capture and retain oil and grease. Laboratory eualua#ions sho~~•r that the CDS units are capable of capturing up to 7d°lo of the free ail and grease from storm •~~vater. CDS units can also accommodate the addition of ail sorbents +,n~ithin their separation chambers. The addition of the ail sarbents can ensure the permanent removal of 8a~'fo to 90% of the free oil and grease from the storm water runoff. {DPERATI+<7NS The CDS unit is anon-mechanical self-operating system and ~~rill function any time there is flow in the storm drainage system. The unit t~nrill continue to effectiuely capture pollutants ire flaws up to the design capacity even during extreme rainfall events ~•rhen the design capacity may be exceeded. Pollutants captured in the CDS unit's separation chamber and sump will be retained even ~~rrhen the unit's design capacity is exceeded. GDS CLEANQtJT The frequency of cleaning the CDS unit vrill depend upon the generation of trash and debris and sediments in your application. Cleanaut and preventive maintenance schedules v~rill be determined based on operating experience unless precise pollutant loadings have been determined. The unit should be periodically inspected to determine the amount of accumulated pollutants and to ensure that the cleanout frequency is adequate to handle the predicted pollutant load being processed by the CDS unit. The recommended cleanaut of solids v~•ithin the CDS unit's sump should occur at 75°~A of the sump capacity. Hoavever, the sump may be completely foil ~rrith no impact to the CDS unit's performance. Access to the CDS unit is typically achieved through fi~+ro manhole access covers -one alia~~n~~s inspection and cleanout of the separation chamber {screenl`cylinder} ~ sump and another alloys inspection and cleanout of sediment captured and retained behind the screen. The PSW & P51,+~1C off-line models have an additional access cover over the Exhibit B-1