Abstract
A device has been developed to measure and to make a composite sample of stormwater runoff from highways. The device was laboratory calibrated and field tested on a portion of Interstate-5 in Seattle, Washington. Performance of the composite sampling device has been compared with conventional discrete sampling instruments. The major discrepancies between the two systems are due to laboratory and flow measurement errors. When these errors are resolved, the performance of the composite and discrete systems are almost identical.
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