Laserfiche WebLink
Felmlmy 1999 HG Cm/ Corrpmy " 1998 Amaral Redarmnor Repirr ~ Pa,Qe 6 <br />Three mine site-wide sprang and seep surveys were performed during 1998. The permit-specified <br />spring and seep survey was conducted on May 7, 1998 in conjunction with the semi-annual surface <br />• water monitoring event. A second spring and seep survey was condutted on June 18, 1998. Spoil <br />springs were also monitored on June 23, 1998 doting the Phase II/Phase III bond release mspectton <br />tour. Selected sprmgs and seeps were also monitored opportunistically at other times throughout the <br />year. Results of the spring and seep surveys are discussed in Section 5.0. The spring and seep water <br />quality data are presented in Exhibit 4, Spring and Seep Monitoring Data. <br />During 1998, Pond 003 was observed discharging between January and October. Monthly NPDES <br />samples were collected during the months that discharge was observed and results of the laboratory <br />analyses indicate that construent concentrations were within NPDES permit limitations. in addition <br />to the monthly NPDES samples, the May 1998 sample waz analyzed for the Full-suite surface water <br />parameter list. All constiruent concentrations were within the range of previously observed values. <br />Pond HG-8 waz observed discharging during every calendar month. Laboratory results indicate chat <br />constituent concentrations were within NPDES permit limitations. In addition to the monthly <br />NPDES samples, the May and November 1998 samples were analyzed for the full-suite surface water <br />parameter list. All constituent concentrations were within the range of previously observed values. <br />Results of the NPDES outfall sampling aze included in Exhibit 3. <br />4.2 GROUNDWATER <br />HGCC performed semi-annual groundwater monitoring at three groundwater monitoring wells, HG- <br />1, HG-2 and UC-2 during June and July 1998. Sampling equipment problems were encountered ac <br />HG-2 in June and the monitoring waz postponed until July. The locations of the monitoring wells are <br />shown on Drawing 2, Hydrologic Monitoring Sites. Groundwater monitoring data is presented in <br />Exhibit 3, Surface Water and Groundwater Monitoring Data. <br />• Well HG-1 monitors groundwater quality and water level down-dip of the reclaimed shop area. <br />Results of the laboratory analyses on the June 1998 sample indicate all constituent concentrations <br />were within previously reported ranges. Well HG-2 is used to monitor groundwater down-dip of the <br />reclaimed mine area. Laboratory analyrical results of the 1998 sampling indicate all constiruent <br />concentrations were within previously reported ranges. Monitoring well UC-2 is only used for <br />monitoring water level elevations. The 1998 data, which is included in Exhibit 3, indicates that no <br />signiEcant changes occurred in water elevations during 1998. <br />As par of the Phase II/Phase III bond release application, HGCC requested that groundwater <br />monitoring at the Hayden Gulch Mine be discontinued and all monitoring wells abandoned. In the <br />Bond Release Inspection Repot, dated July 8 1998, the CDMG indicated that HGCC could <br />discontinue the groundwater monitoring program and abandon all monitoring wells a[ the site. In <br />accordance with CDMG's direction, HGCC abandoned the nine mine site monitoring wells between <br />Ottober 5 - 7 1998. in addition to the three wells that were actively monitored, there were six <br />additional wells that were inactive. The locations of all nine wells are shown on Drawing 2, <br />Hydrologic Monitoring Sites. The well abandonment reports were transmitted to CDMG on October <br />16, 1998. Copies of the well abandonment reports are presented in Exhibit 5, Monitoring Well <br />Abandonment Reports. <br />• <br />Morsgvrrry Watvst "P.O. Boz 774018 • Strmnlua SPrvgt, Qdoracb 80477 ' (970J 8796160 <br />w~~en~n~.dPow~iw~wve ~...rxd.~~xya <br />/rN96 <br />