Laserfiche WebLink
Ground Water <br />Water Levels. Water levels (i.e., depth to water from ground surface) <br />for all wells that are in the current monitoring program are presented <br />in Appendix C. Hydrographs of all historic data for each well are <br />presented prior to the water level reports (for all data since 2004) for <br />each respective well in the same appendix. By presenting all historic <br />data, trends related to seasonal and annual variability are more clearly <br />evident. Water level measurements are taken with an electrical water <br />level indicator, or in the case of a few shallow alluvial wells, <br />directly from a steel tape. Site information, including sampling <br />frequencies, is presented in Table 3, Ground Water Monitoring Site <br />Summary. Ground water level monitoring frequencies are listed in Table 1 <br />of Appendix 15-3a in the Seneca II -W PAP. <br />Ground Water Level Summary. This year, water levels at all wells fell <br />within their historic ranges, with the following exceptions. Hulberson <br />Gulch Alluvium Well WHAL7-2, Wadge Coal Well WW25 and Wolf Creek <br />Underburden Well WWCU25 displayed the lowest water level on record this <br />year. Wolf Creek Coal Well WWC17 displayed the highest water level on <br />record this year. All W-25 series wells were drilled in 2004 and exist <br />in the south pit area downgradient of the last mining area at this mine. <br />Most aquifers at Seneca II -W exhibit a typical seasonal fluctuation. <br />Water levels are highest after the spring runoff, which recharges the <br />aquifer. Often, bedrock aquifers exhibit a lag time between spring <br />runoff and highest water levels. Water levels then decrease as late <br />summer or fall approaches. <br />Ground Water Quality. Table 3, Summary of Ground Water Monitoring <br />Wells, describes the wells that have been sampled in the past and site <br />characteristics. Table 4a and 4b show the new (2010) ground water <br />parameter lists. Analyses have been performed by ACZ Laboratory in <br />Steamboat Springs, Colorado since May 31, 1983. ACZ Laboratory performs <br />all analyses by EPA or equivalent methods. Samples are delivered the day <br />of collection to the lab in an iced cooler. Monitoring frequencies for <br />4 <br />