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After their review of last year's Seneca II AHR, the CDMG made several <br />comments in a letter dated March 24, 2004. Items 1 and 2 dealt with <br />matters in regards to the hydrologic monitoring program. The suggested <br />changes will be addressed in an upcoming technical revision. Item 3 <br />dealt with the discussion of ground water quality use standards. The <br />CDMG's request will be incorporated into this AHR. <br />Meteorological Data <br />Precipitation data was obtained at the Seneca II Mine using a Belfort <br />Weighing Bucket Rain Gage. Daily precipitation data for this year are <br />presented in Table 1. Total monthly precipitation data collected since <br />1981 are presented in Table 2. Where indicated, data from the U.S. <br />Weather Service - Hayden Station were used. Temperature, wind speed and <br />direction data are presented in Appendix B of the Seneca II-W AHR. The <br />Seneca II-W Mi ne Meteorological Station located approximately seven <br />miles southwest of the Seneca 22 Mine. Climatic conditions are similar • <br />between the two mines. <br />Data from the National Climatic Data Center's Hayden Station is used <br />here to evaluate the precipitation trend. For this year, 17.66 inches <br />of precipitation was measured, which is 0.32 inches (2~) above the 1971- <br />2000 average. November, December, February, April and September were <br />all above average. Snowpack runoff, as estimated by totaling November <br />through April precipitation values, was 9.45 inches, which was 0.70 <br />inches (8~) above the 1971-2000 average. <br />The Seneca II precipitation gage measured 16.59 inches this year. This <br />value is 1.96 inches (11~) below the 1981-2004 average. Snowpack <br />runoff, estimated using the Seneca II precipitation gage, was 8.83 <br />inches (November-April total), which is 0.56 inches (6~) below the <br />Seneca II 1981-2004 average. This is the fifth year in a row of below <br />average precipitation at Seneca II. These values are more relevant than <br />the Hayden Station data when evaluating the spring runoff observed this • <br />year at Seneca II, Especially noteworthy is the March precipitation <br />2 <br />