Laserfiche WebLink
' r~ ; , <br />.. A: <br />c <br />TER.'fS AND CONDITIOP:S (Continued) <br />2. effluent Limitations (Continued) <br />_: u~ _, \ <br />mit No.: C0-0027154 <br />c. Efiecti~ae during periods of precipitation greater than the <br />10-year, 24-hour event for this facility. <br />Any discharge or increase in volume of a discharge caused by <br />precipitation within any 24-hour period greater than the <br />10-year, 24-hour event (or series of storms or snowelt•of <br />equivalent vclume) shall comply ~:itl- the following limitations <br />instead of limitations of Part ?.:..=. a and b. j/ <br />pH - (Standard Units) shall remain between 6.5 and 9.0 b/. Oil <br />and grease shall no[ exceed 10 ng/1 b/ in any grab sample nor <br />shall there be a visible sheen. - <br />Salinity -monitoring only. <br />d. Additional Conditions - effective at all times. <br />Tnere shall be no discharge of floating solids or visible foaa <br />in other than trace amounts. The disc'r.aroe shall not contain <br />any sanitary sewage or other pollutants not associated with <br />acti•.~e mining operations. <br />r~ <br />LJ <br />3. Requirements for Effluent Linitaticn Compliance Determination <br />Within 90 days of the effective date of this permit modification, the <br />permittee shall submit to the Division, documentation which specifies <br />[he 10-year, 24-hour precipitation event (ir. inches of rain) and the <br />volume of water fron active mining areas, preparation plants, and <br />associated areas which would result from a 10-year, 24-hour <br />precipitation e~•ent. This documentation shall identify the gauge <br />station being used. Documentation may be in the form of a letter or <br />other indication from the Colorado "fined land Reclamation Division, <br />the Federal Office of Surface PLining, the Federal Environmental <br />Prctection Agenc}•, or other appropirate agenc}• acceptable to [he <br />Colorado water Quality Control Division. <br />I[ shall be the permittee's responsibility to document both [he <br />rainfall amount and [he volume of storm runoff produced, should a <br />precipitation even[ occur (pursuant to 40 CFR 434.63(c)). j/ <br />• <br />4. pest Mininc Areas <br />pursuant to 40 CFR 434, commencing a_t the time that active mining <br />ceases, federal post mining effluent limitations _'or settleable <br />solids (.5 ml.!1) shall become a^.plica'ole, plus at a minimum state <br />effluent limitations for oil and grease (less than 10 mg/1) and water <br />quality standards for pY. (5.5-O.C s.u.). When active mining ceases, <br />the pcrni[tee shall noti`y the Division in writing of changes in the <br />operation and the per^:it shall be modified accordir.gl}•. <br />b/ j/ - See Pale 5 <br />I / ~ <br />PLdified i[, ~'/~~~ <br />