Spatial distributions of perchloroethylene reactive transport parameters in the Borden Aquifer

[1] We determined the descriptive statistical and spatial geostatistical properties of the perchloroethene ln K-d and the ln k of a 1.5 m thick by 10 m horizontal transect of the Borden aquifer near the location of the Stanford-Waterloo ( SW) tracer experiment. The ln K-d distribution is not normal and is right skewed because of a few high values that occur localized in two regions of the transect. In contrast, the ln k data can be characterized by a normal distribution. A linear regression of ln K-d on ln k yields a statistically significant positive correlation, also shown at small lags in the cross correlogram. No significant vertical or horizontal trend in the ln K-d data was detected. The semivariogram ranges of ln k and ln K-d differ from one another in the vertical direction (0.33 +/- 0.06 m and 0.20 +/- 0.04 m, respectively) and are much less than the horizontal ranges ( a few meters). Despite significant effort the horizontal range of ln K-d remains poorly characterized because of limitations of the sample locations. Many of the characteristics described above do not match those assumed in prior theoretical studies that examined the importance of various aquifer characteristics on SW tracer transport. We suggest that there is knowledge to be gained by revisiting the conclusions of these prior studies in light of the new information presented here.