Laserfiche WebLink
cross section and values of the stream velocities measured with a current meter, or a float io <br />determine velocity. Float velocities are multiplied by a correction factor of 0.8 (Brakensir:k et al., i 979 • <br />and Buchanan and Sumers, 19681. <br />Sites YSSF2, YSSF3, WSSF3, YSAF4, and YSGFS have been equipped with Parsherll flumes and <br />continuous flow recorders. Continuous flaw is not monitored in the winter since the flumes arn_I Tloat <br />stilling wells freeze up. Rating curve:: used far flume data reduction were derived by comparison of <br />stage heights with flow measurement=. obtained by the methods mentioned in the previous paragraph. <br />Procedures used to collect ground water quality samples are dictated by individual well site conditions <br />such as casing diameter, depth to water, casing storage volume, rate of recovery, and pumping <br />~, capabilities of sampling equipment. 411uvial and bedrock wells are sampled by purging a minimum <br />volume of water at a consdant rate while concurrently measuring field parameters (temperature, pH, <br />and electrical conductivity) for stabilit~•, and then collecting the sample once the field parameters have <br />stabilized and the minimum volume of water has been purged. The minimum purge volume, purge <br />rate, and sampling device has been established for each monitoring well based on consideration of well <br />site conditions, field parameter measurements, and evaluation of water quality analytical results. <br />', Table 15-7, Ground Water Quality Monitoring Procedures, Yoast Mine, presents the ground water <br />sampling procedures put into effect ire August, 1993. For procedures prior to that, see the remarks <br />it page that accompanies the water quality data presented in Appendix 7-4, Ground Water Chemistry <br />Data. <br />Devices used to sample alluvial wells include either bailers or submersible pumps, and either bailers, <br />submersible pumps, or positive displacement pumps are used to sample bedrock wells. Ground water <br />levels are measured with trn electronic water level indicator. Water levels in some shallow alluvial <br />welts are measured directly with a steel tape. <br />Sampling protocol is reviewed and maintained in a systematic fashion that delivers reliable data. <br />I, Peabody will continue [o implement improvements in sampling protocol to minimize errors affr:cting i <br />~ both field chemistry measurements and sample collection. <br />• <br />18 Revised 2/r.19 <br />