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DRAFT - FEBRUARY 9, 1990 <br /> <br />Provide convenient access for equipment and maintenance personnel <br />to the chamber site and into the chamber itself. <br /> <br />Be inspected at least three times a year (spring, summer and fall) <br />to determine the volume of stored grit, and be cleaned immediately <br />whenever significant grit has accumulated or there is a likelihood <br />that the chamber will be full of grit before the next scheduled <br />inspection. ~ <br /> <br />Regional Detention Basins <br /> <br />Regional detention basins must: <br /> <br />1. Conform to stormwater runoff criteria. <br /> <br />Have water quality features and dead storage designed based on a <br />runoff event generated by 1 inch of rain in 4 hours. <br /> <br />Be designed in accordance with the National Urban Runoff Program <br />(NURP) guidelines. <br /> <br />Include an outlet control structure that effectively prevents <br />floating debris and oils from 'entering the downstream conveyor <br />system. <br /> <br />Sediment Collection and Nutrient Entrapment <br /> <br /> Basins used for sediment collection and nutrient entrapment must conform <br />to the criteria for on-site or regional detention basins (whichever are <br />appropriate). In addition, the detention basins must: <br /> <br />2302047/LRRWMO.WP/TMK 9 <br /> <br /> <br />