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• 2.04.7 RESPONSE continued statistical retrieval. retreaval for param mining operations. Tables 6. 7 and 8 condense the statistical eters. of special interest concerning coal Comparison of Table 6 with Table 7 indicates the possibility of a slight increase in the concentration of all listed parameters and hence, a slight overall degradation in water quality along the Yampa's intervening reach. This could be caused by an artifi- cial biasing. resulting from the differing numbers of samples upon which the statistics at the two sites are based. However, it also could indicate the influx of elevated concentrations of chemical constituents from sources such as Dry Creek and the town of Hayden, both of which exist in this intervening reach. An abbreviated classification of water qualities suitable for • various uses is presented in Table 9. A comparison of the mean concentration values of the three statistical retrievals has been made and is presented in Table 10 matrix. Tra general, it was determined that parameter total concentrations were within suit- able quality criteria. Occasionally. for drinking and food pro- cessing uses. total concentrations levels were in excess of the criteria, however, dissolved concentrations were found to be acceptable. For these infrequent occurrences, the water was identi$ed ae being within standards on the basis that ordinary treatment techniques .would be capable of removing the sus- pended portion of the parameter's total concentration. Water quality at all three sites was found to be acceptable for drinking, irrigation and food processing uses with the qualifi- cation that the concentrations of certain parameters were not available. Water quality is generally not acceptable for use in boilers especially the high pressure variety. Such systems typically use demineralized water in any case.