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Oro Valley presents ADEQ Small MS4 characterization monitoring results; mostly non-detects, traces linked to vehicles
Summary
Staff presented results of characterization monitoring required under the ADEQ small MS4 permit: Oro Valley sampled three outfalls and reported most constituents below lab detection levels, with recurring detections of barium and antimony linked to vehicular brake wear.
Scott Bennett, stormwater staff, presented the town’s characterization-monitoring work under the Arizona Department of Environmental Quality’s Small MS4 permit and described how the town met the monitoring requirement.
Bennett said the permit (issued in 2021) requires monitoring at three outfalls — industrial, commercial and residential — and that Oro Valley conducted sampling at three locations using available commercial and residential outfalls because the…
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