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A new NPD89 amealdmeat went into effect oa 9aDtember 1, 1999. This amendment i authorized a reduction in monitoring frequency (from weekly to monthly) at Pointe 002, OOd, and 008. A copy of this amendment has been yrovided to the CDMG. After their review of last year's Seneca II AHR, the CDMG made several comments in a letter dated March 20, 2000. SCC rasDOnded to those comments in a letter dated March 29, 2000. Meteorological Data Precipitation data was obtained at the Seneca IS Miae using a Balfort weighing Hucket Raia Gage. Daily praciDitation data for this year are presented is Table 1. Total monthly precipitation data collected since 1981 ere presented is Table 2. where iadieated, data from the II.S. weather Service - Aaydan Station were used. Temyeratura, wind speed and direction data-are presented is Appendix B of the Seneca IZ-w ABR. The Seaecn II-w Miae Meteorological Station located approximately seven miles southwest of the Seneca II Miae. Climatic conditions era similar between the two mines. Data from the National Climatic Data Center for the Baydea Station wen used to evaluate the precipitation tread. For this year, 17.05 inches of yreciDitation was measured, which was 0,21 iachea (1$) greater than the 1961-1990 average. All months but October, November, May, June, and July ware above average. 5nowpack runoff, ae estimated by totaling November through April precipitation values, was 10.19 inches, which was 1.78 iachea (23A6) above the 1961-1990 average. The Seaecn II yrecipitation gage measured 16.95 inches this year, This value is 2.35 iachea (12ec) less than the 1981-2000 average. Snowpack runoff, estimated using the Seneca II praciDitation gage, was 8.91 inches (November-April total), which ie 0.74 inches (8'k) lees then the Seneca II 1981-2000 average. These values are more consistent than the Naydea Station data when evaluating the spring runoff observed this year at Seneca I2. • • 2