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Abstract: The potential impact of non-point source pollution from highway runoff containing highway safety road flare components, specifically perchlorate migrating to the Lexington Reservoir was the objective of this evaluation. Potassium perchlorate is used in the production of highway safety road flares, which are commonly used on Highway 17 as a means of providing safety awareness to commuters and redirecting traffic. The research reported herein was a study designed to evaluate the potential of perchlorate in flares to migrate with runoff flowing along and adjacent to Highway 17 and into engineered and natural channels which eventually flow into the reservoir. Laboratory tests conducted by the District in 2003 showed that in theory a single 20 minute flare could potentially contaminate up to 1.46 acre-feet of water to just above the State notification level of 6 micro-grams per liter (*mg/L).
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