REP25453 - Laserfiche WebLink

Home Browse Search

10/04/96 10:51 FA% 9709295177 0%BOW SANBORN ~ 005 Anthony Waldron Page 4 September 15, 1994 Spring 7 is in the hill-side, cut-bank of the Coal Gulch trail. While the historical data for Springy 7 indicates it is typically dry, monitoring in 1993 and 1994 indicates ground flow in the spring months, resulting in high conductivity measurements. Spring 8, the flow from the Oliver Mine, had recorded flow during all of the monitoring' events. The monitoring data collected during 199?, 1993 and 1991 compares quite well with the historical data. Svhile the flow measurements during this period were lower than the historical data, the constant flow rate of 12 gpm for the historical data is suspect. Variations in pH were from 6.9 to 9 (9.9 in September 1992 is suspect) compared to 6.9 to 9 for 1983 to 1981. Conductivity measured 1800 to 4900 umhos/cm compared to 1900 to 4000 umhos/cm, indicative of a ground water source. Variation in temperature is less with warm temperatures in the winter months, also indicative of a ground water source. Spring 9 is a spring or seep at the base of the landslide feature in the Unamed Gulch. Flow has been nearly continual, but at very low rates, with a few exceptions. High conductivity measurements indicate ground flow, but conclusions based on temperature patterns are not clear. Spring 1U is a spring or seep at the base of the colluvium just above Old Highway 133 at the west end of the Hawk's Vest east sita. Data for Spring 10 is similar to Spring 9. Spring 11 was cowered during the reclamation of the Hawk's Vest East :line by the Division. Ft was originally in the facilities area below Old Highway 133. Yo flow was recorded for Spring 11 in 1992 and 1993. In May of 1991, water began to collect in the road cut above Old Highway 133. This was monitored and an elevated conductivity and temperature was measured. Flow was recorded in June and July, but the conductivity and temperature measurements decreased. Water damage to the pavement of Old Highway 1'33 had occured next to the re-emergence of Spring 11, and between the July and ALLgll3t monitoring events; the Colorado Department of Transportation performed maintenance of the roadway and ditch in the area of Springs lU & 11. Both Springs 10 and 11 were dry at the time of the :august monitoring. The source of all springs, except Spring 8, is precipitation or snowmelt. This water infiltrates and percolates downward until the water encounters a coarse zone or aquiclude which causes the water to surface as a spring, The primary use of the springs is by wild_ife. The only spring to consistently contribute to surface flow into the `forth Forlc of the Gunnison is Spring 8. All other spring surface flow, if any, returns to the ground before reaciiin~ the Vorth Fork of the Gunnison.