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After their review of last year's Seneca II AHR, the CDMG made several comments that are <br />rncorporated into this year's AHRS. The first comment xas about updating the ground and • <br />surface water standards tables presented in Tables 5 and 9. SCC reviewed the new Colorado <br />Department of Nealth's (CDOHI standards and compared them to the AHR tables. No changes <br />were made to the AHR tables since the updated CDOH regulations did not change any <br />applicable standards. <br />The second comment was about the excursions of certain ground rates quality use standards <br />that were reported in the AHR. Those issues aze discussed in [he following ground water <br />section. <br />The third comment was about the applicability of certain surface water use standards used <br />in the AHR. Tables 9 and 10 have been revised to more clearly define the standards used. <br />The last comment was about TDS values on lower Grassy Creek observed in 1998 that were <br />above PHC predictions. The PNC predictions aze based on long term average values. <br />Individual TDS measurements on Cressy Creek will vary from year to year due to climatic <br />conditions and the relative amount of discharges into Gras ey Creek from Points 002 and 003 <br />at the time of sample collection (which may vary by the amount of rater being pumped from • <br />Pond 002 for rater trucks and the amount of truck wash rater being discharged into Pond <br />003) . Last yeaz, TDS values observed were 35 percent greater in June, and 4 percent <br />greater in September, that the predicted values. This year, hoxever, observed values were <br />only 11 percent greater in June, and 11 percent less in September, than the predicted <br />values. What is important ie what the long-term trend indicates, and not what the <br />rndividual values observed are. As stated in this year's ANR, the TDS trend at lower <br />Grassy Creek (Site SS G2) appears to be nearly level. <br />Meteorological Data <br />Precipitation data was obtained at the Seneca II Hine using a Belfort Weighing socket Rain <br />Gage. ^aily precipitation data for this year are presented in Table 1. Total monthly <br />precipitation data collected since 1981 era presented in Table 2. Where indicated, data <br />from the U.S. Wea thet Service - Hayden Station were used. Temperature, wind speed and <br />direction data are presented in Appendix B of the Seneca II-W AHR. The Seneca II-W Hine <br />• <br />2 <br />