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<br />JUN '7'95 15 16 No.005 P.10 <br />.. ~. <br />u]T,ull. amuunCC of water ae Che adjacent tailir,96 consol_`.dat..e. <br />q,3 btatc,d irr S1MR1's November 30, 1993 lett;cl~ to tl:n <br />UivlYfion, I}MRI does not believe that the in tai]iT:y~ <br />piezomcterr~ wi].1 provide meaningful data for t:h~ <br />construction of the second raise, The pirznrrnt.ere mil] noc <br />determine the ].o::ation or thicknend of a potentially water <br />bearing ZoI]C. The niezometera will prnvide +io data on eho <br />density, undrained shear strength or steady-state strength <br />of the water' bearing lsynra which can be i.novrporatcd :nto a <br />stability ana] ais of the second raise; <br />3tiNulatiott No. 2 stated, <br />°Thea cirr.Trror will install msrkcr3 to delineate tl.,u <br />sot-back z'eyuired between the tailings embankment ar)ci <br />the free water pond. The markers must lie dearly <br />visible acrd adequate to allow straight forward <br />verification in the field that t11e aequiied Get-Harr io <br />maintained." <br />BMRI.'A letter dated November 30, 1993 to tl~e llivi.sioT] <br />..ddreaaed the leoue uL ec-Cablishing a eetbac;k for the .rater <br />edge of the lower. pond from the main embankment such that <br />the. run-r-~f,i fruu, the 100-year, 24-hour storm event would hr: <br />}]e 1. r} wit::ti.n tfte L'aili))gs facility but not in direct cont.ac~ <br />.+iGi the, uYyt2-cam face of the main embankment. Hassel on the <br />e~urveyed average beach elope and the total inflow to the <br />area Lrom the storm event as estimated through standard Sul]. <br />Conservation Service meL'}iods, a conservative water noc+] <br />,;rr.back from Lne main embankment of 25G feet will more char, <br />},ol.d the event and the assoclated run-c+£f. <br />L, oax•].y Fc~bzuury, setback markers were eurvoytr+ti Cn ln<,:.¢~ ion <br />and ;3taked al 250 feet upetreem of the main embankm~n~:. <br />'!'hF t.ermc and conditions oi`. the Tk• 16 approval 1,AVr~ h.~eu <br />iu].ly completed. <br />if: you have any questions, please call. <br />piYa+le d 4' cc, ~' <br />Alana L. Scott' <br />Technical SuFerint+±nrtnnt <br />C'i:: AT]n i~ H:, 1 rlri!7e <br />Dan RobartAr,n <br />Sally ltaynr. <br />