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l~ <br />J. Dillie <br />August 18, 1995 <br />Page 3 <br /> <br />existing series of benches in the pit wall and selectivel}~ placed <br />rockfill around the backfill/pit wall contact. Backfill lacement <br />will be conducted in a manner that produces a final surfa e capable of <br />free draining. Calculations were completed for a 100-yr nd a 10-yr, <br />24 hour storm event. (Ttie SEDCAD calculations can be foun in TR-018 <br />Permit Modification Appendix D). Results indicate that t e sediment <br />discharge from the revegetated, partially backfilled pit 's less than <br />the total quantity incoming from the undiverted, undistur ed, <br />upgradient catchments. Therefore, the gentle slopes of t~e backfilled <br />pit will act to reduce sediment discharge from the proper y. <br />Control of sediment runoff from the partially backfilled <br />be provided through Best. Management Practices (BMP) as di <br />BMRI's Stormwater Management Plan. These BMP's are hay b <br />fencing, and check dams for the first two growing seasons <br />decommissioning. Afterward, with the establishment of ve <br />is anticipated that the backfill will not contribute to <br />runoff. <br />Stipulation No. 6 <br />BMRI AGREES THAT TR-18 WILL BE NULL AND VOID AND THAT THE <br />TERMS, CONDITIONS, AND REQUIREMENTS OF THE APPROVED PERM I` <br />IF THE BACKFILLED WASTE ROCK IN THE WEST PIT HAS TO BE REf <br />REQUIRED IN PARAGRAPH 1 ABOVE !REMOVAL IS NECESSARY IF NO <br />ALTERNATIVE METHOD TO PROTECT GRO"JND4IATER IS APPROVED). <br />BMRI has agreed to this stipulation. <br />Stipulation No. 7 <br />BMRI WILL SUBMIT A GROUNDWATER MONITORING SYSTEM AND METH( <br />THE DIVISION WITHIN 30 DAYS OF THE DATE OF THIS CONDITION? <br />WHICH MAY INCLUDE, BUT NOT LIMITED TO, THE LOCATION AND DI <br />NEW MONITORING WELLS (ONE COMPLETED IN THE RITO SECO AQUII <br />COMPLETED IN THE SANTA FE AQUIFER), '!'HE CONVERSION OF THE <br />WELL TO A MGNITOR WELL, THE FREQUENCY OF MGNITORING, THE I <br />BEING MONITORED, MONITORING PROTOCOL REQC'~IRED1ENTS, A SPEC: <br />it area will <br />cussed in <br />les, silt <br />after <br />etation, it <br />ite sediment <br />XISTING <br />WILL APPLY <br />VED AS <br />ATISFACTORY <br />)OLOGY TO <br />APPROVAL <br />NTH OF TWO <br />lR AND ONE <br />)EWATERING <br />CY ELEf+IENTS <br />'IC <br />