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<br />December 1991 7Tie Rorkrastle Company " Grasry Gap Mine " 1992 Annual Hydrology Report • 4 <br />state limitation of 7.0 mg/l. Copies of laboratory analyses for monitoring of surface water <br />discharge points are included in Appendix A. <br />No discharge was observed from any of the other discharge points from April 30 to October <br />21, 1992. Standing water was noted in Pond 4 during each month monitored but no water was <br />observed in Ponds Z and 3 in April through August. No indication of oil or greaze in any of <br />the ponds was noted during any of the monitoring visits. Access to the property was not <br />' possible during November or December, 1992 due to snow accumulations and poor road <br />conditions. <br />' All culverts and ditches were inspected during June. The inspection was conducted for <br />structural integrity, proper functioning and potential for future problems to develop. Problems <br />were noted along the Pit 4 access road below and above Pond 4 az well az just south of the Pond <br />5/6 embankment. These were noted to Rockcastle and repair w incorporated into the summer <br />reclamation efforts. I'2 ~ ~~.dl ~,.,~ roa.~ C,roSS Mks ~C2~ i~o~-ntrc X/~.~s J\ <br />Historical data for the mine was requested by OMLR. Copies of the Annual Hydrology Report <br />' 1989 as well az the 1991 field and laboratory data for the NPDES discharge points have been <br />included for reference in Appendix B. <br />2.2 OMLR MONITORING <br />Sampling and field measurements were conduced according the requirements specified in the <br />Mining and Reclamation Permit as described in Table 1 previously presented. <br />The field parameters measured included temperature, conduttiviry, pH, and flow rate or water <br />level as appropriate. Flow measurements were estimated using a container of known volume <br />if appropriate or calculated based on the discharge dimensions and velocity. Measurements were <br />taken during the months of June and October at SW-4, the furthest downstream effluent <br />monitoring point. SW-4 is located at the culvert beneath the Pit 4 access road and was observed <br />to be flowing during each field investigation. SW-2, located along the main access road north <br />of Pit 4, was flowing each month of the year monitored. SW-3, located along the access road <br />' to Pits 2 and 3 was flowing in June due to discharge from Spring 5 upgradient along the road <br />to Pit 2, but not in October. The field measurements are presented in Table 3, Field <br />Monitoring Results. <br />' Water level measurements were made in MW-3 in April, June, and October. The well is loated <br />near the intersection of the main access road and the Pit 4 access road. A measurable water level <br />of 10.9 feet during April was noted in the Pi[ 2 spoil well but no water was encountered in June <br />' or October. No water was measurable in the Pit 5 spoil monitor well during April, June or <br />October. <br />., 7 <br />~~ ,, ,t ,~ ,, p.+s , <br />vn.~Ntrrnavr ACZ Inc. "P.O. Box 774018 • Steamhoat Springs, Colorado 80477 "(303J 8796260 <br />