2018-04-05_REPORT - C1982057 - Laserfiche WebLink

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