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6.1.F. - Page 115 EXHIBIT °c" "MAWIXW 0 www.StormTrap.com Precast ConcreteModuf srSforwWaterhtanagewentSystenrs 1- 877 - 867 -6827 8. How to Clean the StormTrap® The system should be completely cleaned back to 100 % of the originally designed storage volume whenever the above sediment levels have been reached. Be sure to wait at least 3 days after a stormwater event to be sure that the system is completely drained (if it is a Dry Detention System), and all of the sediments have settled to the bottom of the system (if it is a Wet Detention System). Do not enter the Underground Stormwater Detention System unless you are properly trained, equipped, and qualified to enter a confined space as identified by local occupational safety and health regulations. The material that is removed may be considered low level hazardous waste and must be disposed of in accordance with any and all local and national regulations. There are many maintenance companies that are in business to help you clean your underground stormwater detention and water quality units. Please call your StormTrap® representative for referrals in your area. A. Dry Detention System Cleaning Maintenance is typically performed using a vacuum truck. Sediment should be flushed towards a vacuum hose for thorough removal. For a Dry Detention System, remove the manhole cover at the top of the system and lower a vacuum hose into one of the rows of the StormTrap® system. Open up the manhole at the opposite end of the StormTrap® and use sewer jetting equipment to force water in the same row from one end of the StormTrape row to the opposite side. The rows of the StormTrap® are completely open in one contiguous channel from one end to the other for easy cleaning. Place the vacuum hose and the sewer jetting equipment in the next row and repeat the process until all of the rows have been cleaned. When finished, replace all covers that were removed and dispose of the collected material properly. B. Wet Detention System Cleaning If the system was designed to maintain a permanent pool of water, floatables and any oil should be removed in a separate procedure prior to the removal of all sediment. The floatable trash is removed first by using a bucket strainer to capture and remove any floating debris. The floatable oils are then removed off the top of the water by using the vacuum truck to suck off any floatable fluids and liquids. The next step is to use the vacuum truck to gently remove the clarified water above the sediment layer. The final step is to clean the sediment for each row as described above in the paragraph "A. Dry Detention System Cleaning ". For smaller systems, the vacuum truck can remove all of the sediment in the basin without using the sewer jetting equipment because of the smaller space. S INGLEMAP GET THE PRECAST ADVANTAGE! DOUBLEMAIP rawrcrrawf�eeumm:r eawrt9nrmrzxrrrrmrurrttm*a