2009-02-04_REPORT - C1981041 (2)

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2008 AHR Page 4 flow and water quality monitoring performed at this site during the Year. Data page SU-3 includes a full suite analysis performed on a sample collected during the Year. The average TDS value at discharge point 016 for the Year was 1,251 mg/I. Whole Effluent Toxicity (WET) tests were not performed during the Year. On May 3, 2005, Snowcap Coal Company requested, via letter to the CDPHE, the WET tests be terminated. This request was granted and the CDPS Permit was amended on June 27, 2005, becoming effective on August 1, 2005. Ground Water The ground water monitoring points on Cottonwood and Rapid Creeks were monitored twice during the Year. Results of the monitoring are listed on data page GA-2. Diagrams G08-1 thru 3 shows a graphical representation of the depth to water for these wells since monitoring began in 1984. Table G08-1 was prepared to show average water levels in the spring and fall to correspond to high and low water levels in the adjacent creeks respectively. Piezometers CRDA-01 thru 06 at the Cameo Refuse Disposal Areas (CRDA) No. 1 and No.2 continued to be monitored quarterly. Data page GC-17 includes measurements for this Year. A graphical representation of the water level elevations in the CRDA Piezometers is shown on Diagram G08-4. The water levels in CRDA-01 and CRDA-01A were relatively stable this Year. Piezometers CRDA-02, 03, 04, 05 and 06 have been damp to dry for the past five years (2004 - 2008). The nested PZ-# piezometers showed only slight variation during the first three quarters of the Year. As noted on Data page GC-17 the majority of the nested piezometers were restricted anywhere from a 10' to 32.5' depth during fourth quarter monitoring. The water levels in the PZ-# piezometers, when not restricted, were all below their critical depths. A graphical representation of the water levels in the nested piezometers is shown on diagrams G08-7, 8, 9 and 10. The results of water level measurements at the unit train loadout this Year are listed on Data page GB-2. Diagrams G08-5 and 6 are graphical representations of water level elevations in these piezometers. Table G08-2 was prepared to show statistics on these water levels corresponding to high and low flows in the adjacent river. Quality information is presented on page GD-14. A former mine dewatering hole (N-1) located at the North Decline area of the mine is used to monitor the water level in the abandoned portions of the Roadside South Portal. Since discharge point 016 was put into service, the water level in N-1 is virtually constant and it is expected to stay at an elevation of about 4758. The results of monitoring N-1 are presented in • Table M08-2. In order to characterize the Rollins Sandstone two surface and two underground wells were