MIGRATION OF A CONSERVATIVE CONTAMINANT: INFILTRATION, FRACTURE CONDUITS, AND RE-EMERGENCE OF CHLORIDE IN WELLS AND STREAMS
The results, shown graphically, demonstrate that 61 to 77% of the asymmetric downslope flow is due to fracture conductivity. In intermittent streams which cross regularly salted roads, the conductivity changes observed downstream of the road show a marked increase. This is particularly notable in dry summer months or drought conditions when the groundwater base flow component of the streams is greater. Measurement of small tributaries and springs along these streams point to long term sequestration near the roads and gradual release of the contaminant as base flow. The effect can continue for miles downstream.