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CGRS,Inc. <br /> ' quality samples will be obtained and analyzed for pH, TSS, TDS, and other relevant parameters /Id.2, <br /> ' identified in the laboratory leaching tests. Samples will be obtained from no less than one up- <br /> gradient and two down gradient wells. The anticipated locations of the monitoring wells are F <br /> depicted on Figure 3. Typical monitoring well construction details are presented in Appendix B. tom, t <br /> 4.3 Backaround Water Quality <br /> In addition to the laboratory testing presented herein, background groundwater quality samples will <br /> ' be obtained from site monitoring wells immediately subsequent to their placement and immediately <br /> prior to coal ash placement. The gravel quarry water obtained for the laboratory testing should be <br /> ' chemically consistent with local groundwater as it is in hydraulic connection with proposed testing <br /> site. The three sampling events should establish baseline levels of the constituents of concern. <br /> ' 4.4 Water Quality &Hydrmeoloeic MonitorinE <br /> The effects on groundwater quality and hydrology as a result of coal ash burial will be evaluated <br /> ' by placing roughly 400 tons of coal ash within a trench at the location shown on Figure 3. The coal <br /> ash will be placed so that the water table intersects the coal ash and that any fluctuation of the <br /> ' water table will be within the coal ash bed. The coal ash will be buried in a trench measuring 10 <br /> feet in width, 100 feet in length and roughly 10 feet in depth. <br /> 1 <br /> In order to evaluate hydraulic characteristics of bottom ash and fly ash, one-half of the trench will <br /> ' be filled with fly ash. A native soil divider will be left and the other half of the trench will be filled <br /> with bottom ash and fly ash. Bottom ash will be placed in the lower one-half of the saturated <br /> portion of the trench and fly ash will be placed to one foot below ground surface. Approximately <br /> one foot of native soil will be place over the entire trench. <br /> ' Variations in water quality will be verified through quarterly water quality monitoring for <br /> ' analytical parameters identified in the laboratory quality assurance plan (Appendix Q. The results <br /> of the analyses will be submitted to the Colorado Department of Public Health and Environment, <br /> ' Division of Minerals and Geology and Weld County Health Department. Within one week of coal <br /> ash burial water quality samples will be obtained from all monitoring wells. Water quality samples <br /> ' will be obtained on a weekly basis for one month and then on a monthly basis. The length of <br /> ' 10 <br />