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After their review of last year's Seneca II AHR, the CDMG made several . <br />comments in a letter dated December 10, 2002. The CDMG requested that <br />some missing spoil spring data from last year's AHR be sent to them. <br />That data has been sent to the CDMG. <br />Meteorological Data <br />Precipitation data was obtained at the Seneca ZI 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 £rom 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 Mine Meteorological Station located approximately seven <br />miles southwest of the Seneca II 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, 12.37 inches <br />of precipitation was measured, which was 4.47 inches (268) less than the <br />1961-1990 average. Only March, April and August were above average. <br />Snowpack runoff, as estimated by totaling November through April <br />precipitation values, was 6.90 inches, which was 1.51 inches (188) below <br />the 1961-1990 average. <br />The Seneca II precipitation gage measured 11.86 inches this year. This <br />value is 6.90 inches (378) less than the 1981-2002 average and is the <br />lowest on record. Snowpack runoff, estimated using the Seneca II <br />precipitation gage, was 5.96 inches (November-April total), which is <br />3.49 inches (37$) less than the Seneca II 1981-2002 average. This is <br />the third year in a row of below average precipitation at Seneca II. <br />These values are more relevant than the Hayden Station data when <br />evaluating the spring runoff observed this year at Seneca IZ. <br />• <br />2 <br />