WW Engineering and Science, Inc. 1997. Soil and Groundwater Investigation at Wind Cave National Park. 101+ p.

Abstract

This report summarizes the results of a recent soil and groundwater investigation conducted at Wind Cave National Park. The purpose of the investigation was to assess the potential impact to soil and cave water caused by the burning of treated wooden fence posts and dumping during the past 25 years at the Mixing Circle area within the Park. In the past, fence posts were treated using pentachlorophenol (PCP) while more recent fence posts preservation techniques use a copper-chromium and arsenic-based lead levels (16 ug/L) exceeded the Maximum Contaminant Level (MCL) for residential drinking water (15 ug/L). Lead was not detected in the groundwater sample. Tetrachloroethylene, Trichloroethylene and Dioxin were also above method level detection limits in soil samples. Arsenic was detected in the Park water supply well sample with a concentration of 5.4 ug/L. It was also detected in the cave seepage water samples wtih a range of 6.9 to 19 ug/L. Zinc, at a concentration of 250 ug/L, was also detected in the Park well.