RecDoc 2013-017254 - Laserfiche WebLink

Browse Search

EXMIBIT"C" ` �� WWW.StormTrap.COITI �sfConutlsM�duJirS7ormWeferMana9emmfSyrtemt 1-877'$67�6827 8. How to Clean the StormTrap� The system should be completely cleaned back fo 100%of the originaily designed storage volume ' =whenever the above sediment leveis have been reached. Be sure to wait at least 3 days after a � � storrnwater event to be sure that the system is completely drained (if it is a Dry Detention System},and all of the sediments have settied to the bottom of the system{if it ts a Wet Detention System). Do not enter the Underground Stormwater Detention System unless yau 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 cansidered low level hazardous Waste and must be disposed of in accordance with any and ali local and national regulations. There are many maintenance companies that are in business to heip you ciean your underground stormwater detention and water quality units. Please call your StormTrapce�representative for referrais in your area. . A. Dry Detention Systern Cleaning Maintenance is typically performed using a vacuum truck. Sediment should be flushed towards a vacuum hose for thorough removai. For a Dry Detention System,remove the manhole cover at the top of the system ahd lower a vacuum hose into one af the rows of the StormTrap�system. Open up the manhole af the opposite end of the StormTrap��nd use sewer jetting equipment to force water in the same row from one end of the StormTrap�row to the opposite side. The rows of the StormTrap�are completely apen in one contiguous channe(from one end to the other for easy cieaning. Place the vacuum hose and the sewerjetting equipment in the next row and repeat the process unti!all of fhe rows have been cieaned. 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,fioatables and any oil shauld be rernoved 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 8oatable 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 fhe 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/N�LE�,R/'I P GET THE PRfCAST ADVAMaCE� DouBtEfi�i�p 1..n�.w•�rw�.�.n..+. >w.r�....orn� �escriptioa: San Mateo,Cg Document - Year.DoclD 201I.ZI542Z Page: 27 of 23