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saturated sediment is mostly from storm water sources. It is also possible that Turkey Creek below <br /> the quarry is carrying slightly more water than it does above the quarry because of the addition of <br /> water from purchased sources such as dust abatement water that flows into the sediment basin. <br /> Therefore, periodically pumping out accumulated pond water in the sediment basin and on top of <br /> the sediment layer complies with the law, especially after thunderstorms or large snowstorms that <br /> raise the static level of the pond. It is important though to leave enough water on the top of the <br /> sediment to keep it wet as when it dries out completely it can add to air pollution in high winds. <br /> Under these circumstances, this is likely the best that can be done. But when the sediment is <br /> cleaned out drying of the sediment is necessary. The water in the sediment makes it fairly liquid <br /> and extremely heavy. <br /> As far as documentation is concerned measurements would be useful. As the pond <br /> currently has a deep layer of sediment there is no feasible way to install a graduated scale to <br /> measure depth and estimate the level of the sediment. Therefore, the next time the sediment is <br /> cleaned out a graduated scale may be installed that will allow measurements to be made of total <br /> depth. It is not known now whether that installation is feasible and have the scale stay in place. <br /> Another method would to simply determine the depth of the pond from the top of the <br /> berm to the bottom of the pond. Then by measuring the distance from the top of the berm to the <br /> water level and, if possible, the sediment level the total depth could be determined. This would <br /> require markers of some kind on the berm slope. <br /> The depth of the water to the top of the sediment is very difficult to measure as the lower <br /> level of the water layer is usually cloudy enough that a clear view of the top of the sediment cannot <br /> be seen. Of course, when the sediment is visible a measurement can be taken and the depth of the <br /> water determined. However, these depths will not determine exactly how much storm water has <br /> been accumulated over what period of time, but in general when a large rain or snow comes water <br /> will be pumped out in accordance with the rules to the highest extent possible under the existing <br /> conditions. So, the object is to keep as much water pumped out of the pond as possible without <br /> pumping mud into Turkey Creek. <br /> Technical Revision Menzer Quarry M-1973-009-HR June 2021 Page 3 of 7 <br />