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Storm water monitoring along loop 202 and Salt River.
  • Published Date:
    2010-10-01
  • Language:
    English
Filetype[PDF-2.09 MB]


Details:
  • Creators:
  • Publication/ Report Number:
    FHWA-AZ-10-602
  • Resource Type:
  • Geographical Coverage:
  • Format:
  • Abstract:
    A comprehensive research program for the characterization of storm water runoff from an Arizona

    highway was conducted from January through December 2007. The study area covered a portion of

    the Loop 202 freeway west of Mesa Drive to a retention basin east of Lindsay Road in Mesa, Arizona.

    Storm water samples were collected from two storm water detention basins and a discharge point to

    the Salt River. The study was conducted by manually collecting storm water samples with passive

    automatic samplers and analyzing them for various roadway constituents. A primary objective of this

    research effort was to establish baseline values of constituents in ADOT highway runoff, aiding in the

    evaluation of related best management practices.

    A total of 16 storm water samples was collected from the research area between January 2007 and

    December 2007. The storm water sampling data indicates suspended solids (reported as total

    suspended solids, or TSS) were present in 14 of the 16 samples collected and zinc (reported as total

    zinc) was present in 13 out of 16 samples collected. Other heavy metals such as copper, lead, and

    chromium were occasionally detected. Phosphorous and ammonia were detected only once during

    this research program. TSS is the most significant pollutant, by mass, found in our nation’s

    waterways, a standing consistent with the outcome of this research. It is important to note that

    exceedance of an Environmental Protection Agency benchmark does not constitute a storm water

    violation

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