United States Department of Transportation
i
Small-scale studies on low intensity chemical dosing (LICD) for treatment of highway runoff.
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2006-04-01
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[PDF-1.60 MB]
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Alternative Title:Caltrans LICD final report.
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Abstract:In the Tahoe Basin, strict surface water discharge limits of 20 NTU for turbidity and 0.1 mg/L
for total phosphorus are due to come into effect in 2008. The main concern in terms of water
quality is the discharge of fine particles and nutrients into Lake Tahoe. The overall goal of this
project was to determine the feasibility of low intensity chemical dosing (LICD) for improving
highway storm water runoff quality in the Lake Tahoe Basin. A primary objective was to
identify promising coagulant chemistries for turbidity and phosphorus reduction that could be
tested further in small-scale and full-scale pilots. This project combined literature reviews,
laboratory studies (charge titration and jar test experiments using synthetic and actual storm
water runoff) and settling column studies to assess treatment performance and feasibility. A
related project funded by the U.S.D.A. Forest Service (through the City of South Lake Tahoe)
for which the Caltrans funds for this study provided the match has investigated ecotoxicity issues
associated with coagulant treated storm waters in the Tahoe Basin.
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