MIXING ZONES DO C KET 5 8 -0 1 0 2 -1 4 0 1 Oil je ts pre - mixe d - PowerPoint PPT Presentation

MIXING ZONES DO C KET 5 8 -0 1 0 2 -1 4 0 1 Oil je ts pre - mixe d with so a p a re fire d into la ye re d fluid. Pho to g ra ph b y Ste ve Ha re nb e rg , e t a l. UNC Jo int F luids L a b o ra to ry

OUTLINE • Re vie w c o mme nts re c e ive d • Disc uss dra ft rule ve rsio n 3 • Disc uss re ma ining se c tio ns (a , c , g a nd 02) • Sto rmwa te r • Pre se nta tio n o n no nflo wing wa te rs • Disc ussio n

COMMENTS RECEIVED

COMMENTERS • Cle a rwa te r Pa pe r • E PA • I ACI • I MA • NOAA • Simplo t

SUMMARY OF COMMENTS • Se e do c ume nt Summa ry o f Co mme nts Re c e ive d: Ne g o tia te d Rule Dra ft No . 2, June 27, 2014 c o mme nt de a dline • Cha ng e s ma de to the dra ft rule we re in re spo nse to c o mme nts re c e ive d during la st me e ting a s we ll a s writte n c o mme nts

DRAFT RULE VERSION 3 C HA NG ES A ND A DDITIO NS

060.01.d Dra ft Ve rsion 2 Dra ft Ve rsion 3 Mixing zo ne s sha ll no t Mixing zo ne s sha ll no t c a use unre a so na b le c a use unre a so na b le inte rfe re nc e with, o r inte rfe re nc e with, o r da ng e r to , e xisting da ng e r to , e xisting b e ne fic ia l use s, inc luding b e ne fic ia l use s. spe c ie s liste d unde r the Unre a so na b le E nda ng e re d Spe c ie s Ac t. inte rfe re nc e with, o r Unre a so na b le da ng e r to , e xisting inte rfe re nc e with, o r b e ne fic ia l use s inc lude s, da ng e r to , e xisting b ut is no t limite d to , the b e ne fic ia l use s inc lude s, fo llo wing : b ut is no t limite d to , the fo llo wing :

060.01.d.i Dra ft Ve rsion 2 Dra ft Ve rsion 3 I nte rfe re nc e with fish Blo c king fish pa ssa g e , spa wning , pa ssa g e , o r e g g inc ub a tio n o r pre ve nting suc c e ssful re a ring . spa wning , e g g inc ub a tio n o r re a ring .

060.01.d.ii Dra ft Ve rsion 2 Dra ft Ve rsion 3 Je o pa rdy to Re mo ve d this ite m E nda ng e re d Spe c ie s a nd inc lude d te xt in Ac t liste d spe c ie s, o r 060.01.d to c a ll o ut de struc tio n o r e nda ng e re d spe c ie s. a dve rse mo dific a tio n to c ritic a l ha b ita t.

060.01.d.iii Dra ft Ve rsion 2 Dra ft Ve rsion 3 No w 060.01.d.ii – He a t in the disc ha rg e He a t in the disc ha rg e tha t c a use s the rma l tha t c a use s the rma l sho c k, insta nt sho c k, le tha lity o r lo ss le tha lity o r lo ss o f o f c o ld wa te r re fug ia . c o ld wa te r re fug ia . Adde d de finitio n o f the rmal sho c k. mal Shoc k . A ra pid te mpe ra ture c ha ng e tha t c a use s T he r a q ua tic life to b e c o me diso rie nte d o r mo re susc e ptib le to pre da tio n o r dise a se .

060.01.d.iv Dra ft Ve rsion 2 Dra ft Ve rsion 3 No w 01.d.iii – I n de te rmining whe the r a Bio a c c umula tio n o f mixing zo ne will c a use po lluta nts (a s unre a so na b le de fine d in Se c tio n inte rfe re nc e with o r 010) g re a te r tha n da ng e r to , e xisting the a q ua tic life b e ne fic ia l b io a c c umula tio n use s, the De pa rtme nt fa c to r use d in sha ll c o nside r the c a lc ula tio n o f wa te r b io a c c umula tive na ture c o lumn c rite ria . o f the po lluta nts invo lve d.

060.01.d.v Dra ft Ve rsion 2 Dra ft Ve rsion 3 No w 01.d.iv – Ac ute to xic ity to L e tha lity to a q ua tic a q ua tic life o utside life pa ssing thro ug h the zo ne o f initia l the mixing zo ne . dilutio n.

060.01.d.vi Dra ft Ve rsion 2 Dra ft Ve rsion 3 No w 01.d.v – Co nc e ntra tio ns o f Co nc e ntra tio ns o f po lluta nts tha t po lluta nts tha t e xc e e d Ma ximum e xc e e d Ma ximum Co nta mina nt L e ve ls Co nta mina nt L e ve ls a t drinking wa te r a t drinking wa te r inta ke struc ture s. inta ke struc ture s.

060.01.d.vii Dra ft Ve rsion 2 Dra ft Ve rsion 3 No w 01.d.vi – I nte rfe re nc e with Unre a so na b le pub lic swimming inte rfe re nc e with a re a s. re c re a tio na l use s.

060.01.i.ii Dra ft Ve rsion 2 Dra ft Ve rsion 3 A la rg e r mixing zo ne tha t Adde d – e xc e e ds the limits is T he disc ha rg e r sha ll ne e de d b y the pro vide to the disc ha rg e r a nd do e s no t De pa rtme nt a n a na lysis c a use a n unre a so na b le tha t de mo nstra te s a inte rfe re nc e with, o r da ng e r to , e xisting la rg e r mixing zo ne is b e ne fic ia l use s a s ne e de d g ive n siting , de sc rib e d in Sub se c tio n te c hno lo g ic a l a nd 060.01.d, a nd the mixing ma na g e ria l o ptio ns. zo ne me e ts the o the r re q uire me nts se t fo rth in Se c tio n 060.

060.01.j Dra ft Ve rsion 2 Dra ft Ve rsion 3 T he De pa rtme nt T he fo llo wing re c o mme nds the e le me nts sha ll b e fo llo wing e le me nts c o nside re d whe n whe n de sig ning a n de sig ning a n o utfa ll: o utfa ll:

060.01.a M IXING ZO NES IN IM PA IRED WA TERS

060.01.a Dra ft Ve rsion 2 Dra ft Ve rsion 3 Adde d – Mixing zo ne s sha ll no t Mixing zo ne s sha ll no t b e a utho rize d fo r a b e a utho rize d fo r E . g ive n po lluta nt whe n c o li. the re c e iving wa te r do e s no t me e t wa te r q ua lity c rite ria fo r tha t po lluta nt.

Suggested changes to 060.01.a Mixing zo ne s sha ll no t b e a utho rize d fo r a g ive n po lluta nt whe n the re c e iving wa te r do e s no t me e t wa te r q ua lity c rite ria fo r tha t po lluta nt unle ss the a utho rize d disc ha rg e me e ts a n a ppro ve d T MDL a llo c a tio n o r o the r a pplic a b le re q uire me nts. Mixing zo ne s sha ll no t b e a utho rize d fo r E . c o li.

STORMWATER

060.01 Mixing Zo ne s fo r Po int So urc e Wa ste wa te r Disc ha rg e s

060.01.c SIZE A ND C O NC ENTRA TIO N BA SED O N DESIG N FLO W

060.01.c T he size o f the mixing zo ne (s) a nd the c o nc e ntra tio n o f po lluta nt(s) pre se nt sha ll b e b a se d o n the po int so urc e wa ste wa te r pe rmitte d de sig n flo w. T he De pa rtme nt sha ll no t a utho rize a mixing zo ne tha t is de te rmine d to b e la rg e r tha n is ne c e ssa ry.

060.01.g A DJA C ENT M IXING ZO NES

060.01.g Adja c e nt mixing zo ne s o f inde pe nde nt a c tivitie s sha ll no t o ve rla p.

060.02 PO INTS O F C O M PLIA NC E

060.02 Points of Complianc e for Nonpoint Sour c e ge s. While it is re c o g nize d tha t Disc har mixing do e s o c c ur fo r no npo int so urc e s, due to the ir g e ne ra lly inte rmitte nt a nd diffuse na ture , the spe c ific a tio n o f mixing zo ne s fo r no npo int so urc e s is no t pra c tic a b le . I nste a d, the De pa rtme nt ma y e sta b lish po ints fo r mo nito ring c o mplia nc e with a mb ie nt wa te r q ua lity c rite ria in a sso c ia tio n with a utho rize d no npo int disc ha rg e s.

060.02 Draft Version 3 Points of Complianc e for Nonpoint Sour c e ge s. While it is re c o g nize d tha t Disc har mixing do e s o c c ur fo r no npo int so urc e s, due to the ir g e ne ra lly inte rmitte nt a nd diffuse na ture , the spe c ific a tio n o f mixing zo ne s fo r no npo int so urc e s ma y no t b e pra c tic a b le . I nste a d T hus, the De pa rtme nt ma y e sta b lish po ints fo r mo nito ring c o mplia nc e with a mb ie nt wa te r q ua lity c rite ria in a sso c ia tio n with a utho rize d no npo int disc ha rg e s.

Suggested 060.02 Points of Complianc e for 404 Dr e dge and F ill Ac tivitie s and Nonpoint Sour c e Disc har ge s. While it is re c o g nize d tha t mixing ma y o c c ur fo r no npo int so urc e disc ha rg e s a nd fro m 404 dre dg e a nd fill a c tivitie s, due to the ir g e ne ra lly inte rmitte nt a nd diffuse na ture , the spe c ific a tio n o f mixing zo ne s fo r no npo int the se so urc e s ma y no t b e pra c tic a b le . I nste a d T hus, the De pa rtme nt ma y e sta b lish po ints fo r mo nito ring c o mplia nc e with a mb ie nt wa te r q ua lity c rite ria in a sso c ia tio n with the se a utho rize d no npo int disc ha rg e s.

NONFLOWING WATERS M IXING IN LA KES A ND RESERVO IRS DO N A . ESSIG , IDEQ JULY 1 0 , 2 0 1 4

OUTLINE • Wha t is me a nt b y no nflo wing • Wha t’ s the pro b le m • Unde rsta nding ne a r-fie ld ve rsus fa r-fie ld mixing • Wha t ha ve so me o the r sta te s do ne • So me o ptio ns • Our pro po sa l

WHAT IS MEANT BY NONFLOWING? • L a ke s, re se rvo irs, we tla nds … • Wha t wo uld b e c la ssifie d a s le ntic wa te rs fro m a n e c o lo g ic a l pe rspe c tive • F a irly o b vio us, b ut we la c k a c le a r de finitio n in rule • F lo w ‘ dire c tio n’ ha rd to disc e rn, ma y va ry • L ittle to no ve lo c ity • Wa te r b o die s tha t typic a lly the rma lly stra tify in te mpe ra te c lima te s

WHAT’S THE PROBLEM • Sta g na nt o r no nflo wing wa te rs do n’ t mix ve ry we ll • Mo st o f the c o nc e pts a nd la ng ua g e in E PA g uida nc e a nd o ur rule s a ddre ss mixing a s if the re we re a sing le dire c tio n o f flo w: • “L o w flo w de sig n disc ha rg e c o nditio ns” • Zo ne o f pa ssa g e • Org a nism drift time