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EXH181T"C" :�r�l�ll�l��iPoN www.StormTrap.com P�ufContrNeMOdularSlamWaterAUnaqrmmfSrslma 1-877-867-6827 5. Inspection Schedules for Private Qevelopment The StormTrap�System,for a private development,shouid be inspected after each major storm water � event,but at least annually. If the StormTrap�is inspected on an annuai basis,then the system should' be inspected before the stocmwater season begins to be sure that everything is functioning properiy for the upcoming storm season. 6. Inspection Process This inspection should be done at least 2 or 3 days after a rain event so that all of the detention areas have been drained and the water is at the lowest level. Visually inspect the system at all menhole tocations. Inspect each pipe opening to ensure that the silt level or any foreign objects are not blocking the pipes. The sediment level in the underground detention system can be determined from the outside of the system by opening up all fhe manholes and using a sediment pole to measure the amount of sediment at each location. Force the pole to the bottom of the system and then remove it and measure the amount of sediment at that locatlon. Measure and document the amount of silt at each manhole location. Do not gn into the system under any circumstances without proper venfilatian equipment and training. � Be sure to inspect the outlet pipe(s)because this is typicalfy the smallest pipe in the system. 1t is common that most of the larger materials will be callected upstream of the system in catch basins,and it is therefore important at time of lnspections to check these structures for large trash or blockages. Remove any blockages that you can during the inspection process only if you can do so safely from the top af the system without entering into the system. Again, do not go into the system under any circumstances without proper ventifation equlpment and training. Pass any information requiring action onto the appropriate maintenance personnel if you cannot remove the blockages f�orn abova during the inspection process. Be sure to describe the location of each manhole and the type of material that needs to be removed. � • The sediment level of the system should also be measured and recorded during the inspection process. Recording the sediment level at each manhole is very important in order get a history of sediment that can be graphed over time(i.e,years)in order to estimate when the next time the system will need to be maintained. It is also important to keep these records to verify the date and location of the inspection • process if anyone asks for your records in the future. 7.When to Clean the System Any blockages should be safely removed as soon as practicaf so thaf the Stormwater detention system wil!fil(and drain properly before the next stormwater event. The Ory Detention System should be completely cleaned whenever the sediment occupies more than 10%o to 15%of the originally designed system's volume. The Wet Oetention System should be cleaned when the sediment occupies more than 30%or 1/3rd of the originally designed system's voluma. NOTE:Check with your municipality in regards to cleaning criteria,as the allowable sediment before cleaning may be more or less then described here. S/NriLE��/1 P Gt7 TNf PRECAST AOVANTAGf.� DQUBLE��P wmwn+t�r+...n.+.�. � lar�ava�rea.�n�ww '�escz.iptzou: San Mateo,CB Documeut - Yesr.DocSD 2012.115421 Page: 16 of 23