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:, <br />Gold Hill Mill Adeuuacy Review Reapotrm July 18,1995 <br />2. The temporary 2-foot high berm err the dam crest has been completed. The existing decant system wn~ <br />decant only sto® nutoff water into the Hazel A actin <br />a) The pumpback system to the mill that is in place now wiu be used to drmrp excess water from <br />the Hazel A end interconnected mvrea bar]r into the tmlirrgs pond to allow eveporatian of any <br />excess water. <br />b) M tailings wig be removed Guar the Haul A add per the Ikvision's 6/7/93 inspection report. <br />c) BULKEIEAD GULKING DESCRIPTION - REPAIRS NO LATER THAN 7/17!95 <br />d) A locking gate will be ~thlled on the Hanel A porhl this summa. <br />e) If the Flaael A bulldread cannot be maurhined in a watertight condition, a aasrerete or ma+e <br />effective bulldreed wrIl be installed that is watertight. <br />3) We have attempted to getha compreherrsive weather data for atetiorr an the eastern abpe et elevations <br />s®iler to Gold Eli0. Mean pterapihtion and teruperatiue doh are available for ehaaat every masdh of <br />the year, however, one or two months ere ocoristerdly mieaed dumrg the year. Alkarperk has date fix <br />®r or seven months of each year but bill year doh u r"L -mow. The eVaagE tldlperatiIIea of the two <br />atelier vary 2 to 4 degrees std average precipihtion by month may vary over an inch. No public <br />souroe urfomtetion asr wind speed std humidity was aver7eble abler than I)ema hm~rtiorul AirpaR <br />Pen evepontion data from "NOM Teo6nicel Repot NWS 33, Evaporation Atlas for the Contiguous <br />48 United Ste0x". pul>fished in 1982 gave dame far five marths Gam May through 5ept~rba for S to <br />1 S years woAh of data Uhlimrg the avatLble doh for the lager pond hrdica6es Gill evapontiorr far the <br />entire year. The casting pond Ira approximately 3.3 inedra of exoeas water ova a year using the <br />Boraces of date deacdbed above. The data given a general urdicatiorr ttret the new pasd an evapaate <br />nsinfed far an average year but the location of the data sanrroea with respect to Gold Il>71 maloea the <br />ovma8 corrchLVions somewhat auapxt. 7~vo tables ere atholyd tbet show the results of tlee water <br />balance cak~rlations. <br />COM, Inc. vvi8 submit to a closed circvrt impoundment ayatern with the capacity to contain the <br />following everrts: <br />a) A 10-yea, 24hora eto~ (2.9 incLes rainSeg) <br />b) A storm egrul to 4096 of a 100-year, 24hora event (1.84 nrchea rdrtfall) <br />c) A 100-year, 24hour event (4.6 irrehea rainfall) <br />Total area for the rainfall events u 2.917 acre and the concattrated area is L32 acre. Although a lows <br />CN mamba than 100 could be used, moat of the Brea is roof or totally lined area wAh tittle infiltration. <br />The oorroartiated depth of water in the pond would be 20.64 irrchrss. Although we Gxl a 2-foot <br />ficebaerd above the hack-to-back storm event is adcgrmte, we vn'Il cormrtit to a 4.28 foot &eebeard <br />above the storm event storage, or a tohl of 6 feet of See storage area Gom the top of tailur®r to the <br />embankmatt crest. <br />!n aspanee to your rapmst um our meeting of July 13, 1995, COM, Inc. wry instill a weel6a gaitherarg <br />station tb collect precipitation, high, low and mean ternperatarre, average wind speed. end humidity es <br />Uase line for evaporation <br />