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1996 Annual Hydrologic Report • Page 4 aze combined proportional to the total discharge for the previous month to form one sample. The survival rates for all samples taken this Yeaz were in compliance with the dischazge permit requirements. Ground Water The ground water monitoring points on Cottonwood and Rapid Creeks were monitored twice during the year. Residts of the monitoring are listed on data page GA-2 (data page GA-1 is also included to correct a typo). Diagrams G96-1 thru 6 show a graphical representation of the water level elevation in these wells since monitoring began in 1984. Table G96-1 was prepared to show average water levels in the spring, corresponding to high water level in the adjacent creeks and in the fall or near low water levels. Measured water level in GWMS-OlA and B were lower in the spring and higher if the fall than normal, in GWMS-02A was above normal, GWMS-02B was normal to lower and GWMS-03A and B were below normal. Piezometers CRDA-Ol thru 06 at the Cameo Refuse Disposal Areas (CRDA) No. 1 and No.2 continued to be monitored quarterly. Data page GC-4 and 5 includes measurements for this Yeaz. A graphical representation of the water level elevations in CRDA-Ol is shown on Diagrams G96-7. • As shown on this diagram, the water levels dropped slightly again this Yeaz. Table G96-2 was prepared to show statistical information on the CRDA piezometers since installed. Multiple listings for a site represent time frames for which the top of the pile was at different elevations. Separate listing also occur to indicate dry and problem readings also. Most of the original CRDA-# piezometers and the PZ-# piezometers showed only slight variation during the Yeaz. The results of water level measurements at the unit train loadout this Yeaz aze listed on Data page GB-1. Diagrams G96-8 thru 11 are graphical representations of water level elevations in these piezometers. Table G96-3 was prepared to show statistics on these water levels corresponding to high and low flows in the adjacent river. UTL-Ol, -02 and -03 water levels were lower than the average for the site. UTL-04 showed a higher than normal water level. These averages may not be a true representation of the statistics for t~e sites due to the sharp change in water level measurements before and after the end of 1 8~ hen monitoring personnel changed. Data page GD- I 1 contains the result of full suite water analysis done on UTL-02 and 04 during the Year. Diagrams G96-12 and 13 aze trilineaz representations of these water analysis. The circles' size on the Trilineaz diagrams indicate a relative amount of TDS, the lazger the circle the higher the TDS. Both sites showed a higher TDS this Yeaz. The chemical chazacteristics at UTL-02, the upper site, continued to show a wide variation. The characteristics of the lower site, UTL-04, showed more of a variation than normal. Both sites had a higher alkalinity and bicazbonate level for most of the difference. A former mine dewatering hole located at the North Decline azea of the mine is now being used to . monitor the water level in the abandoned portions of the Roadside South Portal. It is monitored primazily to keep it within a 10' zone between the bottom of the siphon for outfall 002 and the