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<br /> <br />J. Dillie <br />April 15, 1996 <br />Page 2 <br />sediment discharge from the revegetated, partially backfilled pit is less than the total quantity Incoming from the <br />undiverted, iutdisturbed, upgadient catchments. Therefore, tkte gentle slopes of the backfilleA pit will ^ct to <br />reduce sediment discharge from the properly. <br />Control of sediment runoff from the partially backfilled pit aria will be provided through Best Managenteat <br />Practices (IMF) ns discussed in BMRI's Stornnvater Management Flan. These BMP's are hay bales, silt fencing, <br />and check dams for the first two growing seasons after deconunissioning. Afterward, with the establishment of <br />vegetation, it is anticipated that the backfill will not contribute to site sediment rvrtoff. <br />According to the calculations and testwork performed by SRK, BMRI will not <br />be diverting surface flow to the Rito Seco. Calculations show that <br />infiltration and the flatter slopes will overcome the flow coming in. <br />Therefore, runoff will be minimal to nonexistent and the use of a culvert is <br />unnecessary. BMP's are all that is needed to control any flow from storm <br />events or snowmelt. Please refer to the Stormwater Management Plan, or <br />sections D.B, E.2.1., and G.2 of TR-018, and sections D.3.2.3 and E.2.1 of <br />our Permit. <br />Sincerely, <br />Sally HUayes Kaiser <br />Environmental Engineer <br />cc: Anne Saldrige <br />Dan Robertson <br />