Laserfiche WebLink
' CGRS, Inc. • • <br />quality samples will be obtained and analyzed for pH, TSS, TDS, and other relevant parameters <br />' /identified in the laboratory leaching tests. Samples wilt be obtained from no less than one up- <br />Y' !gradient and two down gradient wells. The anticipated locations of the monitoring wells are <br />1-~' I" <br />' depicted on Figure 3. Typical monitoring well construction details are presented in Appendix B. <br />1 <br />1 <br />1 <br />1 <br /> <br /> <br /> <br />1 <br />1 <br /> <br />1 <br />1 <br /> <br />1 <br /> <br />4.3 Backsround 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 />7~? <br />4.4 Water Quality & Hydroseolot>;c Monitories <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 />~~„{~!~ <br />In order to evaluate hydraulic characteristics of bottom ash and fly ash, one-half of the trench will ~ ,,rt'"~,<< <br />Y <br />be filled with ash. A native soil divider will be left~and the other half of the trench will be filled ~ <br />with bottom as_~ fly ash. Bottom ash will be placed in the lower one-half of the saturated <br />portion of the trencft~ 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 />n 1 ~ ~ c~ W"~'~ ! <br />Variations in water quality will be verified through quarterly water quality monitoring for <br />l,3nalytical parameters identified in the laboratory quality assurance plan (Appendix C). 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 burialJwater 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 />