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Introduction <br />The following Hydrologic Monitoring Program was initiated on December 10, 1999 at the Seneca II -W <br />Mine upon approval of the II -W South Expansion Permit Revision No. 2. This program is similar to <br />the previous monitoring program (see Appendix 15 -3). Changes to that program are discussed <br />below. <br />Surface Water <br />Site FG5 is located on Sage Creek upstream of both the Seneca II -W and SCC's Yoast Mine. <br />Monitoring at this site will be deleted from this permit but will be retained at the Yoast Mine. <br />Site CGI is located downstream of the proposed Pond 015 (Sage Creek tributary). Monitoring was <br />dropped here in 1986, but will now be resumed. <br />Site SG16 is located at the proposed Pond 016 (Hubberson Gulch tributary) site. Site SG17 is <br />located at the proposed Pond 017 (Hubberson Gulch) site. Site SG9 is located on Hubberson Gulch <br />upstream on Pond 017. These new sites will be added to the monitoring program. <br />NPDES monitoring frequencies have been changed from monthly to weekly as a result of a proposed <br />change to the NPDES permit (Appendix 15 -4). Monitoring will remain at a weekly basis until the <br />NPDES permit is amended. <br />0 Sprincis <br />Springs S -7 and S -46 were included in the original 1979 spring survey. Monitoring of those springs <br />will be resumed. Springs S -47, S -48, and S -49 were discovered after that survey and have been <br />voluntarily monitored. These three springs will now included in the monitoring program. <br />Ground Water <br />Wells USGS Al, A3, A8 and Al2 exist in the Sage Creek alluvium at the Yoast Mine area (upstream <br />from Seneca II -W). As those four wells are part of the Yoast monitoring program (referred to as <br />YSAL1, 3, 8, and 12), they will be dropped from the Seneca II -W monitoring program. <br />Wells 4W, 4OV1, 4WC, and 40V2 were all part of the original Seneca II -W monitoring program and <br />were discontinued in 1986. Monitoring at those four wells has been resumed. <br />Water level monitoring at most Seneca II -W wells is five times a year (February/March, April /May, <br />June /July, August/September, and October /November). Water level monitoring frequencies at these <br />wells will be changed to triannually (May /June, August, and October /November). Monitoring during <br />the winter will be dropped due to inaccessibility and <br />15 -3a -1 Revised 01/02 <br />