Laserfiche WebLink
',:attr ~;uaiit:' Coatro. ~ivisioa <br />rationale - Page 2 <br />• Perm:*_ So.: CO-0035G:~ <br />FACI~I1": DcSCP.IPTION: <br />The pcrmittee has requested that an additional discharge point be added to the <br />permit. Tne new outfall is a combination of flows from four sources and shall be <br />designated as outfall 1E004. This outfall is shown i^ Figure 2 on page 19a of the <br />per^it and will discharge to Scullion Gulch. Scullion Gulch runs underground <br />t?.r nL•~?1 the site via a 72-inch buried pipe. Du tfall 1'004 discharges to the buried <br />pipe as shown in Figure 2. Monitoring points will be described in [he Discussion <br />section of this rationale. <br />As stated above, four sources contribute to outfall 11004. They are mine <br />de::atering, shop and conveyor washdown, potable water treatment plant reject water, <br />and wastewater treatment plant (WWTF) effluent. All sources are continuous, <br />although the ouantity of mine water flow may vary. <br />`;ine ::a ter consists o` water encountered during mining operations, pumped out of <br />the ;vine to pond PP-1. Washdown water also goes to PP-2. <br />Fotablc HTP reject water is the rejected portion of the flow through a reverse <br />osaos_s plant. This water is high in dissolved solids. The raw water to the plant <br />corms from alluvial wells along the Sihite River. 1.'hen separated from the finish e3 <br />:+a ter, the "reject water" goes to pond PP-Z for settling. <br />• T-~e :~_estic wastewater treatment plant is a Case-Cotter extended aeration 'package <br />pla^t' with a design flow of 0.018 MG D. The plant effluent is chlorinated by a <br />Saruril tablet chlorinator. The chlorine contact basin provides 113 minutes <br />contact time at design flow. <br />T:~e wastewater treatment plant includes the following design aspects: <br />:'ltimate Capacity 500 P.E. @36 gpcpd <br />Average Daily Flow 18,000 gpd <br />Minimum Flow 500 gpd <br />Peak flow 300 gpm for 20 minutes (end of shift) <br />Organic Loading 70 lb BO DS/day <br />Infl. Liit Station A-1 2 submersible pumps, 250 gpm @87' TDH <br />5 ft. diameter wet well <br />Infl. lift Station A-2 2 submersible pumps, 80 gpm @90' TDH <br />4 ft. diameter, wet well <br />Flow Equalization One basin: 18' x 11.33' x 10' SWD = 14,324 gal. <br />13.22 hour detention time <br />'dastewa[er goes to aeration basin via Pneu-Pump, <br />• 12.5 gpm <br />Stu-?ge Storage One tank: 5' x 2.5' x 10.25 SWD = 958 gal. <br />