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February 1998 N•G Coa! 1997 Anrsual Rec(amatiars Report ~ Pape 9 <br />• 5.0 SPRING AND SEEP MONITORING <br />5.1 REQUIREMENT <br />HGCC has committed to annually monitoring six spoil springs on the reclaimed area between <br />April 1 and May 15. As part of the seep monitoring plan springs with a flow rate greater than <br />75 gallons per minute (gpm) will be analyzed fora "full-suite" list of 25 parameters. These <br />springs will be sampled for field water-quality pazameters including pH, conductivity, <br />temperature and estimate of flow. If no flow exceeds 75 gpm, an annual full-suite analysis for <br />the single largest spring will be completed. To date, no single spring or seep flow exceeding 75 <br />gpm has been observed so the full-suite analyses are performed for the largest flow observed. <br />Mitigation involves the subsequent evaluation of each spring or seep and the subsequent <br />determination of the need for remedial action. <br />5.2 RESPONSE <br />On May 13, 1997, the spring and seep survey was completed at the Hayden Gulch mine site. A <br />brief discussion of each site follows. Spoil springs RSP-3 and RSP-4 were also sampled in <br />November. <br />RSP-1 - The genera] location of the seep was covered with snow in May and no <br />measurements were recorded. No flow was observed in November. <br />• RSP-2 - The general location of the seep was covered with snow in May and no <br />measurements were recorded. Field water-quality pazameters were measured in <br />November. The conductivity value was within the previously recorded ranges. <br />The pH value was slightly elevated from the previous maximum value, 8.8 <br />units versus 8.5 units. <br />RSP-3 - Field water-quality measurements were recorded in both May and November. <br />In addition, a sample was collected in November for full-suite analysis. Flow <br />rates appeared similar to previous observations. Conductivity and pH values <br />remained within previously observed ranges. Results of the laboratory analyses <br />indicate that there have been no changes in water quality. <br />RSP-4 - Field water-quality measurements were recorded in both May and November. <br />In addition, samples were collected for full-suite analysis. Results of the <br />laboratory analyses indicates that there have been no changes in water quality. <br />A flow rate of 72 gallons per minute (gpm) was calculated in May by measuring <br />flow in Hayden Gulch immediately upstream and downstream of the seep <br />inflow area. A flume study was conducted in November which indicated a <br />flow rate of 35 gpm. Conductivity and pH were within previously observed <br />ranges. <br />RSP-5 - No flow observed. <br />• <br />Montgomery Watson Americas, /nc. (dba TerraMatrixJ <br />(?O. Box 774018 Steamboat Spnngs, CO 80477 • ~970f 8796160 <br />~IPUmrI Ap\9]A nnulRq <br />l/I]NHp <br />