United States Department of Transportation
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Abstract:The project objective was to conduct a detailed literature review of storm water pollutants and mitigation technologies and synthesize
the information so that INDOT can implement project results into standards. Because it is a municipal separate storm sewer system
(MS4), INDOT is required to minimize storm water pollution. A literature review was carried-out to gauge pollutants examined by other
transportation agencies, the pollutant’s relevance to Indiana roadways, and the effectiveness of storm water pollution minimization best
management practices (BMP). A cost benefit analysis was also conducted for a few BMP devices used in Indiana. Results showed that a
variety of databases contained BMP testing studies and the same type of BMP may not perform similarly at different sites. Some BMPs
can also generate pollutants. Very little BMP design, cost, and performance data were obtained during this study from INDOT and
municipalities contacted due to the organizations being unable to access it. Manufacturer self-reported BMP device performance data
found was not corroborated by independent device testing data. Reliance on manufacturer reported data greatly overestimated the
device’s cost benefit; field validated device performance data are needed. Based on project results INDOT should consider (1)
establishing agency-wide procedures to begin collecting pertinent storm water BMP information from ongoing and planned projects, (2)
surveying which and how many BMPs are under INDOT control, (3) applying caution when estimating BMP performance based on
manufacturer reported data or BMP performance data from other parts of the U.S., (4) conducting a field investigation to determine
pollutant removal effectiveness for select BMPs.
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