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2. Runoff control facilities (including catch basins and assnciatcd structures) shall be <br /> inspected at least annually. <br /> 3. Catch basins shall be cleaned if the depth of deposits is cqual ro or greater than <br /> 1/3 the depth from the basin to the invert of the lowest pipc into or out of the <br /> basin. <br /> - 6 - <br />