Are Phase I Environmental Site Assessments Really Necessary?
Our customers often ask, “Why do I need a Phase I ESA? Is it really worth the additional expense and time?”. Here, we provide a “real life” experience that helps answer these questions and give the customer some perspective.
Article 2: Changes in Iron and Manganese Concentrations in C&DD Leachate with Recirculation
As stated in the previous article in this series, the “Introduction to the Effects of Leachate Recirculation Series”, leachate data was compiled and analyzed using time series graphs and statistical trend testing. The time series graphs allow for a visual determination of trends. However, because there is significant variation in the data due to both natural variation and anomalous data points, visually assessing the trends can sometimes be difficult and subjective. The statistical trend testing using two methods, Sen’s Slope/Mann-Kendall slope estimator and Linear Regression, allowed for a more objective approach to determining trends.