A Stormwater Management Planby Diana Harvey, (A.M.ASCE),
Abstract: Part 2 of the National Pollutant Discharge Elimination System (NPDES) Stormwater Permit requires both sampling and analysis of stormwater and the control of illicit discharges to stormwater sewer systems of municipalities meeting certain population requirements. Stormwater sample collection is most efficiently implemented by first constructing a permanent stormwater monitoring station with a refrigerated automatic sampler. After the onset of a representative rain event (0.254 cm of rainfall occurring at least 72 hours after any valid rain event), the sampler should be initialized to collect the giab sample and record the required in-stream parameters. Based on the forecast and estimations of increases of stream levels, the sampler should then be programmed to initiate collecting flow-weighted composite samples based on signals from either the tipping bucket rain gage or the flow sensor. In addition, the sampler program should ensure that the composite samples are collected throughout the entire rain event. Initial preparations, including gathering maps, selecting a basin to be investigated. and locating all outfalls in that basin, are necessary before any field screening for illicit discharges can begin. To test for the required EPA parameters, a stormwater discharge screening test kit is necessary. This kit can be used in the field to conduct the initial and follow-up outfall inspections. Careful interpretation of this field test data with a visual survey of the basin will identif potential sources of the illicit discharges.
Subject Headings: Stormwater management | Rainfall | Field tests | Water discharge | Basins | Rivers and streams | Parameters (statistics) | Composite materials
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