Laserfiche WebLink
COLORADO DEPARTh1ENT OF HEALTH, Water Qunliry Canlrol Division <br />Rntlonnle - Pnge 3, Pen»ir No. CO-0034/43 <br />3. Numeric Standards: The cmnplete list ojstnndnrds drat hone been n.tsigrred in uccorni+nce wilt the shove clussificutionc <br />eon be found in 3.7.0, Clnscificntions and Numeric Standards jor dte Lower Colorado River Br+.cin (5 CCR 1002-8). <br />The jal/owing numeric standards will be used [o develop ejfluen[ limitations. Only standards jor segrnenl 136 nre.rhown <br />because all discharges to segment l consist ajsurfnce nrnajf. jor which limimtio+rs are not water quality bared. <br />Se2menl !36 <br />Phvsicnl and Bio/ogicnl <br />pH =6.5-9.Os. u. <br />Fecal Coliform.c = 2000/l00 m~ <br />lna'Yanic <br />Unionized Ammonia (NHr) = 0.01 mg/~= (chronic) <br />Residual Chlorine (Cl.) = 0.01 l/0.019 rag/J (chronir/ncate) <br />Metnlc <br />Metal Criteria Stmtdnrd Annh~tical hlethod <br />Iron (Fe) Chronic 1000 ug/~ Torn! Recoverable <br />Iron (Fe) Chronic 300 ug/~ Dissolved <br />Zinc (Zn) Acute/Chronic TVS Dlsso/vet/ <br />(TVS =Table Value Srnndnrds) <br />Table Vuhre Standards (TVS) refers to Table l/! ojthe Bn.cic Srnndardc and Methodoloriec !Dr Sarfnce Waster. For dte <br />metals listed with TVS standards, three sets ojsmndnrds rnny apply depending upon the receiving stream clnssifrcntion - <br />d+osefor protection of 1J nyuntic life use, 2) agriculnvnl use and 3) drinking water use. Table Value Srnndnrds jor the <br />protection ofnquntic life eon be divided into tx•o entegoriec -those rho! are dependen; upon the .rtremn hardness, and <br />those [!mt ore not. Srnndnrds jar the protection ojngriculturnl and x•nter supple uses ore not hardness independent. <br />For Segmem J3h ojthe Williams Fork River, nquotic life use, ngricu(tarn! use and drinking water use standards apply. <br />For hardness-dependent metals .rmndards, the numerical nnlue of the nyuntic life use 6n.ced.ctundurd will depend upon <br />the rombined effluent/receiving stream hardness he/owlhe disdmrge point. The hardness vas/ues to be used ore [!rose <br />which correspond m the !otter 95th percent corfdence limit ojthe mean hardness rnlue nt the periodic low flow <br />criteria, ar determined from n regression analysis ojsite-specific dom. /f data jor such nn analvris is not available, or if <br />a regression annl~~sis is not appropriate, olher methods tons he used. <br />Hardness data ore available jor the Williams Fork Riser downstream ojthe discharges from Nte CECjnciliR•. These <br />clots were obtained from USGS Snmp/ing Slution #09249750, /Dented nt the mouth. The period ojrecorrl is l?/8J <br />through 9/92. The rnenn ojthece darn i.r 234 mg/~~ This vahre will be used to calculc•te hardness-dependent standards. <br />The fallowing table summarizes the meta Ls standards jor al! uses. The most .stringent of these .vi!l be used in cnlculuting <br />eJ/luent limimtionr. <br />