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L 1 lJ 1 VeInNHYIIRYr 1/JON) rp.~ Decemlrr 1991 Tl~e Rorkcastle Company • Grasry Gap Mine • 1992 Annua! Hydrology Report • 3 2.1 NPDES MONITORING Monitoring of the four designated surface water discharge points under the Colorado Wastewater Discharge Permit System was performed monthly from April through October, 1992. Access to the property was not possible during the remaining months due to snow cover. The five dischazge points include: • 001 -Pit No. 4 pond outlet ~ 002 -Pit No. 3 pond outlet - wol ~^~ '~` ~n~.e • 003 -Pic No. 2 pond outlet ~~ 1~"~' 'ti" eitn~^"`'~ • 005 -Pits No. 5/6 pond outlet The location of the dischazge points are presented on Map 1. Discharge at point 005 was observed during each month monitored except October. Final reclamation of Pond 5/6, removal of all culverts, and construction of a new emergenry spillway, were completed in September and the pond was filling during the October field visit. No discharges were noted from points 001, 002 or 003 at any time during the year. Samples were collected for water quality analysis and the flow rate measured for Pond 5/6 discharges. Table 2, Discharge Point 005 Monitoring, presents water quality laboratory results and field measurements for Dischazge Point 005 for 1992. .TABLE 2 .. ~ 'DISCHARGE POIIVT.005 ~MONITORING~ ~ . ~ ~ ~ ~ ~ ~ ~ ~ ~ LARORATORY RESULTS . FIELD RESULTS MONTH pH- ..: SS. TDS Flow: pH. Temp. Cotid:. (uni;s)' (mgll) (mall) .: (gPm) . (units) : :.(F).. (timlios/cro) April 7.7 <0.2 2122.0 7.1 9.9 67.9 2260 May 7.3 <0.2 - 6.7 - - - June 7.9 <0.4 2312.0 5.0 6.J1 77.4 3060 July 7.8 <0.2 - 5.0 - - August 7.8 <0.2 - 5.0 - - September 7.6 <0.2 2422.0 4.0 - - Oc[ober - - - No No - - Discharge Discharge Limita[ions 6.5 - 9.0 0.5 Report Report Report Notes: SS - Sealeable Solids TDS -Total Dissolved Solidt Uon - Total Iron Report -Report aoy measurement As requested by the Division, due to previously high iron content in Pond 5/6, total iron was monitored. Laboratory analyses were performed on samples collected from Pond 5!6 discharge during the month of June, 1992. The total iron concentration was 0.52 mg/1, well below the ACZ Int. • P.O. Boz 774018 "Steamboat Springs, Colorado 80477 * (303J 879.6260