2010-02-04_REPORT - C1981041 (2)

Home Browse Search

2009 AHR Page 4 The following table presents the total dissolved solids concentration in Outfall 002. Average TDS from Pages SE-8 4 SE-11 Outfall 002 Water Year 1999 2000 2001 2002 TDS (mg/1) 1558 1560 1500 1500 Discharge point 016 was put into service April 1, 2002. Discharge began April 3, 2002. This gravity discharge point handles all of the water that flows into the sealed South Portal. Since it is a gravity discharge point, the flow discharged will equal the flow into the mine. Table M09-1 presents a summary of the monthly flow from the mine. Data page SV-8 presents a listing of flow and water quality monitoring performed at this site during the Year. Data page SU-4 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 1,240 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 G09-1 thru 3 shows a graphical representation of the depth to water for these wells since monitoring began in 1984. Table G09-1 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-18 includes measurements for this Year. A graphical representation of the water level elevations in the CRDA Piezometers is shown on Diagram G09-4. 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 (2005 - 2009). The nested PZ-# piezometers showed only slight variation during the Year. As noted on Data page GC-18 ten of the nested piezometers were restricted anywhere from a 12' to 30' depth during first quarter monitoring. There were no restrictions in the nested piezometers during the remaining monitoring events. 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 G09-7, 8, 9 and 10. The results of water level measurements at the unit train loadout this Year are listed on Data