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A. , <br />fart 1 <br />_ .- Page NO.4 <br />.. .. ,. :...... _ .. - ~ ~ - _ ..: ~ ~ Permit iVo.: C'O-(7tUiG48 <br />TER[bIS Aiv`D COVDffIONS , <br />- C. - Sfnrm Fier ~ntinn Frnm Federal Efftnent i imitafinnc - Ontfall OOSR (COt7ttn«ed} _, <br />All data~documentation required by this section which can not be reported on applicable discharee monitoring report <br />-forms (DMRs) shall be reported in a letter as an attachment to the DMR. , Submittal of documentation of containment, <br />maintenance, and precipitation records above does not exempt the petmittee from any other notification rcyuircmems <br />of this permiC - <br />Before'ad overflow of the VLF occuts, CC&V shall implement one or both of the following mcaus to route the <br />. discharge to Outfall OOSB. There will be a controlled release oC t]ow from the Extemal;Storage Pond ("ESP") to <br />Arequa Gulch. The 20 minion gallon capacity ESP. will have a system for reducing weak acid dissociable cyanide <br />("CN'wAn") concentrations prior to release. Transfer of water from the ESP to Arequa Gulch Witt he accomplished <br />using the pumpback pipeline. The sump for the pumpback wilt be used to direct flews from the pipeline into Are[;ua <br />Clutch at OOSB, as shown in Figure 4 of the Perntit. Only minor changes (e.g., removal of check valves, disconnection <br />of pumps! to tl[e pumpback system will be allowed to accommodate Flows from the ESP. <br />An alternative to the pmnphack system will involve laying a temporary pipeline from tfie VLF over the Phase ^ toe <br />born[ to Arequa Gulch. Dur to elevation change fmm the crest to the base of the [oe ben[, siphoning and gravity flow <br />is possible.- Existing riprap,.geotextile, or liner material already in the area would be used alone or in combination to <br />dissipate enerr~ry a[ the outlet of the pipe. Ftoccs under either alternative would enter one of the BMPs in the uppcnncst <br />reaches of Arequa-Gulch before passing through Outfall OOSB, which is below.0utfa11001A. <br />d. . ,Limits for Specific Outfalis <br />Limits foi Outfall OOIA -Discharge From the Sediment Pvnd Located Bekw the <br />vane [ ace racuu « [ )err[ ua im tcn as measure0 a[ r+~r-w.~ <br /> bis~har eLitnlta6 <br />~ <br />F.ffluentPa[aiiieter 0-Dav veca a _ <br />ail ax. Min.TMax. for Ham. <br />Plow b1GD Re ort R ort " <br /> <br />'CSS m •ll <br />~ <br />~0 __ <br />30 <br />- <br />Oil and Grease m'r.'I \ V 10 <br />_ <br />-~- <br />- <br /> <br />Ammonia. "Total t as N . <br />Z00 _ <br />_ <br />_ <br />Rc ort ~~' <br />___ <br />- <br />- <br />Co er Dissolved ' 1 ~__ <br />__ <br />- <br />1'hrou~h Janua 3 t 2006 1 39.0 65A <br />Bc rinnin r Februa 1200G 9.3 49.6 <br />Mercury Total [a/I " 0.01 Re on <br />Cvanidc Weak Acid Dissociable. [rr I Re ort 20* <br /> <br />Aluminum Dissolved r <br />Re on _ <br />II 000 <br />Cadmium Dissolved a+* __~..- <br />ThrouehJanua 31 2006 17.0 100 " <br />e rinnin' Febnta 1 2006 6.2 Re [irt <br />~tanranese Dissdlved. utrll 3 67d 5 905 <br />zinc. Dissolved. ua 600** Report <br />Limits A !'cable Darin r Tem ores ta ndards Modifications -Effective Through 12r 1; 7 <br />I aH su (minimum-maximum) ~'A 5 G-9 0 <br />Limits Based I3 n L'nderl 'n * Standards or Paramet er' With Tem orarv ~Sodificarions -Effective Be rinnin_ 1 %I: US <br />nH. su (minimum-maximum) \`tA 6.0-9.0 <br />~V =Mime Vi>ible. In the e5ent an uil sheen or tlaaling oil is oMerced, a gab sample shall be culkdtd. anat}md. nyarted, and e5aluateJ retan5c to ;he IU <br />mg+'I daily rmacimum values HSt ~~5ot APplica6k. "Poch is w macs limit necessary- inr this dixharee as the k+w~ ITOa~ in Anqua riulch aho,e the discha;gc n <br />zero and the limitation of the mass of the pollutant in the dtsaharac is nut nmc~ssary~ w pnnect the nunuic standards in Areyua Gulch, 'The standarJ or [':c <br />reeuiring SiR-am i. based upon 'inv" cyanide caneentmtkrns. llowe5 er, there is no analyncat procedure 1'or measuring the nmcennation ul Yree cyanid. iir a <br />complex et7tuent. 7lxxefnrc. ASfhl QSrtt,:rican $a:ietj• 1'ur 1-cuing and \7a;crials) unahtkal pruccr:ure Li[?74~pp, H~itl he ~;ed to mcacure „cab ac+d <br />dis5a,:iahlc ryanidc in the diTucnt. This analttical prc,ttdure will detect lice q~anWc plus ihmc firtm u[ u,mples cyanide that arc mu9t readily eurncrt<d n, <br />free cyanide. TTte calcutatcd ettluvrot timitnti+m or ~ pg9 i> Ics than the CCL'cV's demonstrated deuv.tion limit of ;n pet. 'thaeti+re, a fimnauon Tor „ca4 acts <br />dissxiable~c}anide will M >pecnied, and wit[ pd set equal to the detection limit. provided weak acid dis;•+ciahle cyanide eon:cntntitnns arc icsa :F._n C:c <br />me1M,d detcctirn limit or?e PS''1. it will M: a»umed that the S.4g~'f lice cy anidc standarJ is Mime adcyuatdv pn4cctcd •" Thu limit is ;he 8+th perocn!d< <br />value of the analstical rv>ulu ni >ampks cal&roted al Oun'al{ Opl;1 iur the molt mcent 5tl nx+nihs including the rta+nth fir tthich ;he dise!targe a hwne ttp.~red <br />and 5ha11 ~e calculated uxng the lbcnwrti [<ed t45'6 pericmik iunaiun, or other [)n~+ste?tt appre+ved muthtd. <br />