ENFORCE21009 - Laserfiche WebLink

Home Browse Search

and then quarterly for water quality. The specific sampling schedule for all of the ground water monitoring wells is ,., described within Table A, Hydrologic Monitoring Sites, while Table B, Hydrologic Monitoring Parameter List, ~.;` ~tiescribes the constituents to be analyzed. When [he water level measurements are obtained in the alluvial wells, the water level of the adjacent stream will also be determined using a staff gauge or other similar measuring device. The staff gauges have been and will continue to be surveyed following installation to ensure an accurate assessment of the stream elevation. The surveying will be done on a three year interval, beginning in the year 2000, unless physical damage to the gauge occurs prior to that time. Each active staff gauge will be surveyed according to this schedule. Typically, the surveying will de done in the spring or earl}• summer, unless field conditions precludes [his work. During the late fall and winter months, snow and ice buildup on the stream or measuring device preclude an accurate assessment of the stream elevation. For this reason, stream water levels are generally obtained from late Mazch/early April through September. The water level measurement sites are listed on Table A, Hydrologic Monitoring Sites. For all wells, water levels will be measured using a standard level probe or pressure gauge before pumping or bailing of the monitoring well or allowing it to flow for period of time. Measurements will be made relative to a consistent datum, such as the top of the well casing. Pumping or bailing of the wells prior to water quality sampling will be done to ensure that water standing in the well bore is removed; thus, representative field readings and water qualit}• s~ttples can be obtained. Surface Water, Effluent, and Spring Monitoring Surface water monitoring will be conducted to address the quantity and quality of area stream flows, the discharge from sedimentation control ponds, mine water discharge, and quantity and quality of springs. Surface water will be //"- nonitored in the mine plan and adjacent areas using the sites listed in Table A, Hydrologic Monitoring Sites, and as l•.>~escribed within the NPDES Permits CO-0027154, CO-0036684, and CO-0042161. All of the specified sites are denoted on Map 13A, Hydrologic Monitoring Plan. Along Foidel Creek, the USGS has established continuous stream flow monitoring station. The operation and maintenance of the USGS station is planned to continue throughout the life of the mine. TCC may take over these stations in the future depending upon status of agreement with USGS. Sampling of the stream sites will be performed on a flexible schedule during the normal flow period, Mazch through September. Within this time frame, most of the sites will be measured twelve (] 2) times for flow and field parameters and four (4) samples will be obtained for full suite analyses. Measurements for flow and field parameters will normally be collected per the following schedule, field conditions permitting: March - Monthly April - Two times during the month May - Monthly June - Monthly ]ul}• - Monthly August - Weekly September- First two weeks of the month Weather conditions ma}• modify the above schedule but hvelve samples will be collected for the water year. Flow measurements will be determined from stage readings recorded at each station and its corresponding rating ~~trve. Periodic rating of the stream transects will be conducted to maintain accurate rating curves. The rating will ~,~,, conducted during the late spring or early summer and then again in the fall. if rating indicates that a new rating curve is needed, more frequent stream ratings will be performed. TR99-32 Exhla.z APPROVED FE3 t) S 201JD liosioo