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;. iii iiiiiiiiiii iii iii ii 999 STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY ` 1 ~1,j ,r y Depanmenl of Natural Resources ~~ J~ ~~fi/ ~1 t ~ fe ti~ 131 ]Sherman 51., Room 215 J f. ~S e u`" A ~~~ Denver, Colorado 80203 ~~(~ ~(ri,~ p~~ J~~ „y~ _ ~~ Phone: (5031866-7567 ~~ ,~, S~ ~1 6 FAx:13031872-8106 ~,~` ,'~,f,~~ 17P-Np4 1~6 O~ ~ May 9, 1996 ,,F lrb~ rY'~ R'fYR ,` Pt oJ'(7 ~ I ~ K6 S r c (l Mr. Jim Stover MINREC, Inc. ~~A} I Y 2768 Compass Drive, Suite (OI Grand Junction, CO 81506 I~I~ DEPARTMENT OF NATURAL RESOURCES Roy Rome Governor dames 5. Lochhead Executive Director Michael B. Long Division Director RE: 1995 Annual Hydrology Rep ~ rt; Blue Ribbon Mine; Permit No. C-81-407 I Dear Mr. Stover: I The Division has reviewed the 1995 Annual Hydrology Report (AHR) for the Blue Ribbon Mine. The frequency of data collection is in compliance with the approved monitoring plan contained in your permit. As previously discussed, only one flow measurement is taken for both upper and lower Hubbard Creek monitoring points. According to previous correspondence records and in accordance with the permit page 124a, only upper Hubbard Creek is monitored for flow. Lower Hubbard Creek is measured only for the field parameters: pH, temperature, and conductivity. No deviations from the original monitoring plan were noted, i As indicated from the quarterly Discharge Monitoring Reports (not contained in the AHR), NPDFS Permit sampling was not conducted during calendar 1995 due to no discharge from the outfall sampling locations. No significant anomalies in water quality or water quantity data were noted based on a review of this and previous AHRs. Some general comments on the 1995 data are provided below. The data indicate much higher values for conductivity in samples taken from the South Underdrain as opposed to samples collected from the North Underdrain. Water-level data taken from on-site piezometers show very large fluctuations in ground water levels throughout the year. Particularly in P-1, P-2, and P-3 where groundwater levels fluctuate as much as 30 feet. The Division has the following comments regazding the report: 1. For ease of interpretation, data tables contained in the text of the report should be complete. For example, pH and temperature data were not included in Underdrain summary table on page 2. Please submit revised report pages. 2. The graphs of depth to water for piezometers P-1 through P-5 show many additional data points between the required quarterly monitoring points. If these data are available they should be tabulated in the report along with the quarterly data. Please provide a revised summary table for the bench piezometers.