Présentations Colloques

    Oral Presentation
    7.02
    Session 7.02: Urban Hydrogeology
    Daus Anthony
    Implications of storm water recharge on groundwater quality
    Urban storm water management practices coupled with declining groundwater elevations in many California aquifers has resulted in the need to recharge storm water into subsurface. Between 2000 and 2007 a detailed study was performed in the Los Angeles Basin to assess the potential impact from recharging groundwater with urban storm water runoff. Six background locations were selected to monitor storm water runoff, vadose zone soil moisture and underlying groundwater quality for a large suite of parameters including many trace metals such as hexavalent chromium (Cr6+) and arsenic. The sites selected represented industrial, commercial, residential and recreational land uses. Storm water runoff, soil moisture and groundwater were sampled over a seven year period. While Cr6+ and arsenic in storm water was generally very low, soil moisture concentrations of varied over several orders of magnitude spatially and temporally with concentrations well in excess of regulatory standards. Underlying groundwater showed varying degrees of Cr6+ and arsenic. Study results indicate that Cr6+ and arsenic may be released from the vadose zone through dissolution of mineral coatings by exceptionally pure storm water runoff. This has implications for siting storm water recharge facilities, managing the quality of storm water recharge, and potential impacts to underlying groundwater.
    United States

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