Physical and Natural Features

Transcription

1 ATTAHMENT 1 Upp hattahooch Basin Pofil Th Mto Wat Distict psnts 57 pcnt of th ovall Upp hattahooch Hydologic Unit od (HU)-8 Basin, whil that potion of this HU-8 within th Distict psnts 18 pcnt of th total Distict aa. In spit of th small popotion of th Mto Wat Distict it psnts, this aa supplis dinking wat and svs as th pimay cing wat fo tatd wastwat fflunt fo ov 3.5 million popl in th Mto Wat Distict (Atlanta gional ommission [A], 2010). Lak Sidny Lani, managd by th U.S. Amy ops of Engins (USAE), and th hattahooch National cation Aa, managd by th National Pak Svic, a majo cational dstinations within th gion and Southast U.S. Physical and Natual Fatus Gogaphy Th Upp hattahooch Basin has its hadwats in th Blu idg Mountains nothast of th Mto Wat Distict, flowing southwst to th conflunc of th hattahooch with Pacht k. Appoximatly 43 pcnt, o 680 squa mils, of this HU-8 Basin is locatd upstam of th Mto Wat Distict bfo it occupis a latly naow coido though th cnt of th Mto Wat Distict, avaging about 40 mils wid, stating in th nothast con and xtnding to th southwst con (Figus A-1 and U-1). Th hattahooch is ntily within th Pidmont povinc, which consists of a sis of olling hills and occasional isolatd mountains. Th Upp hattahooch Basin includs potions of th Gainsvill idg, ntal Highlands and th Wind Slop physiogaphic disticts (Mto Wat Distict and H2M HILL Engins, Inc., 2002). Potions of 29 citis and 7 countis a within th Mto Wat Distict-potion of th Upp hattahooch Basin, including hok, obb, DKalb, Fosyth, Fulton, Gwinntt and Hall. All of nothn Fulton ounty is now incopoatd within th Upp hattahooch Basin, which also includs just ov onthid, 35 pcnt, of th ity of Atlanta as wll as th nwly incopoatd ity of Bookhavn in DKalb ounty and th ity of Pacht ons in Gwinntt ounty. Th Upp hattahooch Basin covs 1,823 squa mils and, whn combind with th Middl hattahooch - Lak Hading HU-8, dscibd in th nxt subsction, is th lagst basin within th Mto Wat Distict. As nw citis hav bn catd, additional lvls of coodination should b implmntd to nsu pop watshd managmnt acoss ach basin. Hydology and Soils Th hattahooch joins th Flint in southn Gogia to fom th Apalachicola, which flows to th Gulf of Mxico. Th main tibutais fding th Upp hattahooch Basin though th Mto Wat Distict includ th hstat, Wahoo k, Suwan k, Big k, Sop k, ottnwood k and Pacht k. In contast to th mainstm hattahooch, all of th natual tibutais main f-flowing within this basin. Goundwat availability is limitd du to gologic conditions, which stict th potntial yild fo wat supply. PAGE U-1 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT APIL 2017

2 FIGUE U-1 Upp hattahooch Basin within th Mto Wat Distict Towns abun Union Fannin Gilm Whit Habsham oc ha Fl at Wst Fok Lit East Fok Littl tl Wahoo k Dawson ETOWAH Nlson tta at st h Pickns Stphns ho k i v h HATTAHOOHEE Lumpkin lmont Lula 9 Banks Ball Gound Walska 5 «Gainsvill 19 ah w Flat k Et o anton hok Oakwood LAKE SIDNEY LANIE Flowy Banch k umming Gillsvill Hall Holly Spings Bi g Littl Woodstock Milton Mountain Pak obb Johns k a hatt Lawncvill tta ha Lilbun hambl Gayson Bookhavn Snllvill k lakston Dcatu Lgnd Fulton Doavill Atlanta Pacht k lak h Baow Dacula lac h Bkly Lak Nocoss Aubun Gwinntt a Ap Dunwoody Duluth oc h nc Na OONEE Suwan y ho Bufod ov y Smyna h ooc Pacht ons Sandy Spings Suga Hill c Al Maitta st Havn Alphatta oswll 2 Jackson Fosyth Pin Lak Avondal Estats Ston Mountain Walton DKalb 0 Lithonia 5 10 OMULGEE Nwton ± 20 Mils Stams Ocon Intstat Highways Laks Upp hattahooch Mto Wat Distict ountis Distict itis Mogan

3 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE Th flow of th hattahooch though th Mto Wat Distict is gulatd pimaily by Bufod Dam, a fdal impoundmnt foming Lak Lani, which is opatd by USAE. Lak Lani has a dainag aa of 1,040 squa mils, and xtnds fom Bufod Dam about 44 mils up th hattahooch and about 19 mils up th hstat. onstuctd in th 1950s, Lak Lani is a multi-pupos svoi that povids flood potction, pow poduction, wat supply, navigation, cation and fish and wildlif managmnt. It is th lagst svoi in th Mto Wat Distict (as wll as Gogia) and povids th majoity of th Mto Wat Distict s wat supply, ith though dict withdawals o downstam lass. Mogan Falls Dam, a scond small downstam dam opatd by Gogia Pow, is a un-of-th pojct that povids mino gulation of th. Wst Point Lak, also a USAE svoi, is th scond majo svoi on th hattahooch systm, locatd just south of th Mto Wat Distict. Avag monthly flows in th hattahooch at Atlanta ang fom a low of 9 cubic ft p scond (cfs) to a high of 8,959 cfs, with a man flow of 2,509 cfs basd on 59 yas of cods (U.S. Gological Suvy, 2015). ainfall angs fom an avag of 60 inchs p ya in th nothastn pat of th basin to 53 inchs in th southwstn pat. Th Mto Wat Distict lis almost compltly within th Pidmont and th Blu idg (idg and Vally) gologic povincs. Th aquifs in ths povincs ovli cystallin ocks that cop out in th nothn potion of th basin and xtnd to th Fall Lin. Th ock is ovlain with dposits of wathd, unconsolidatd ock dbis (golith) that mak up th availabl aquif spacs. Ths dposits a thickst in vallys, but gnally povid insufficint yild fo uss oth than vy low dnsity sidntial and thus sufac wat is th pimay souc of potabl wat fo th Mto Wat Distict. Th Gogia Gologic Suvy Hydologic Atlas 18 databas idntifis appoximatly 84 aas, psnting about 15 pcnt of th Mto Wat Distict, likly to contain thick soils considd to b an indicato of significant goundwat chag aas. Th chag aas w mappd basd on outcop aa, lithology, soil typ and thicknss, slop, dnsity of lithologic contacts, gologic stuctu, th psnc of kast and potntiomtic sufacs. Th a appoximatly 172 squa mils, 9 pcnt of th total basin aa, of potntial chag aas within th Upp hattahooch Basin, as listd in Tabl U-1. Tabl U-1. Goundwat chag Aas within th Upp hattahooch Basin chag Aa Typ ounty Squa Mils of chag Aa Typ within ounty Pobabl Aas of Thick Soil Total chag Aas obb a DKalb Fosyth Fulton a Gwinntt Hall b a Potions of obb and Fulton ountis ovlap th basin bounday. b Mino diffncs in mapping mthodologis may caus basin totals to vay slightly fom county totals. An assssmnt of th availability of goundwat soucs in slct pioitizd aquifs of Gogia was compltd as pat of Gogia's omphns Stat-wid Wat Managmnt Plan (Gogia EPD, 2010). Non of th hattahooch Basin within th Mto Wat Distict was slctd as a pioity aquif fo assssmnt; howv, a wat budgt appoach was usd to povid a planning lvl assssmnt of goundwat souc sustainability in th hattahooch -hickamauga k and Soqu Basins, which cov 315 squa mils upstam of th Mto Wat Distict in potions of Habsham, Towns, Union and Whit ountis. It found that th a small amounts of additional goundwat availabl fom th PAGE U-3 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT APIL 2017

4 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE Palozoic ock aquif in th nothwstn Gogia study basin and fom th cystallin-ock aquif in th Pidmont and Blu idg. Th a fou soil associations that dscib th soil typs in th Upp hattahooch Subbasin: cil-madison-pacolt, Madison-Davidson-Pacolt, viw-hwacla-atcay and th "uban" soils that stat in noth Fulton ounty (Tabl U-2). Th cil-madison-pacolt and Madison-Davidson-Pacolt associations w th most abundant, with th fom typs associatd with modat olling hills and th latt with stp tain. Ths soils a wll daind and highly wathd, having a d to yllowish-d subsoil (Bock, 1977: Jodan t al., 1973; Muphy, 1979; Thomas and Tat, 1973; USDA, 1976; Thomas, 1982; Wlls, 1961; obtson t al., 1960; USDA, 1958; Tat, 1967; Thomas and Tat, 1964). Th viw- hwacla-atcay association was found along th banks of som of th majo s, paticulaly th low half of th hattahooch. Ths soils a vaiabl and lss wll daind than soils on high lvations (Thomas and Tat, 1973; USDA, 1976; Thomas, 1982; Thomas, 1982 and USDA, 1958). Tabl U-2. Majo Soil Associations within th Upp hattahooch Basin Soil Association Significanc to Watshd Managmnt cil-madison-pacolt Madison-Davidson-Pacolt viw-hwacla-atcay Uban Soils Aas of Bdock haactistics: Associatd with modat olling hills, wll daind, highly wathd. Significanc to Watshd Managmnt: Sloping sufacs may b mo suscptibl to incasd osion du to stomwat unoff fom impvious sufacs; wll-daind soils may b mo pmabl, which incass infiltation capacity in aas without impvious cov, also may impov fasibility of infiltation pactics. haactistics: Associatd with stp tain, wll daind, highly wathd. Significanc to Watshd Managmnt: Stp tain may b mo suscptibl to incasd osion du to stomwat unoff fom impvious sufacs; wll-daind soils may b mo fasibl fo infiltation pactics. haactistics: Found along th banks of som of th majo s; lss wll daind. Significanc to Watshd Managmnt: Locatd na watbodis, this soil typ is chaactizd by flat tain lss suscptibl to osion du to stomwat unoff vlocitis fom impvious sufacs; poo-daind soils a lss fasibl fo infiltation. haactistics: Highly distubd and compactd soils. Significanc to Watshd Managmnt: ompactd soils; poo-daind, soils a lss fasibl fo infiltation, stictd wat dainag. Infiltation pactics may b limitd in aas of contiguous bdock. Potctd Spcis Potctd spcis includ all spcis listd as thatnd o ndangd by th U.S. Fish and Wildlif Svic (USFWS) o National Main Fishis Svic, and thos listd as ndangd, thatnd, a o unusual by th Stat of Gogia. Th USFWS also may dsignat citical habitat fo a fdally listd spcis, which povids potction fo th habitat as wll as th spcis itslf. Th cunt listings of ths ndangd spcis, including thi status, ang and habitat, can b accssd via th USFWS's automatd Infomation, Planning and onsvation Systm (IPa, Nat Spcis Th Mto Wat Distict is hom to a numb of nat spcis that a considd thatnd o ndangd. Potcting watshd halth is mo than potcting wat quality; it also includs potction of biological soucs. Within th Mto Wat Distict, th a a numb of potctd animal spcis that spnd all o pat of thi lif cycl in s and stams o dpnd on stams fo a significant potion of PAGE U-4 APIL 2017 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT

5 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE thi lif histoy. In addition, th a potctd plants that a ith aquatic o smi-aquatic and gow within o along th magins of s and stams. Tabl U-3 lists th 8 potctd spcis potntially found within th countis of th Upp hattahooch Basin of th Mto Wat Distict. Tabl U-3. Aquatic and Smi-Aquatic Potctd Spcis in th Upp hattahooch Basin Fauna Typ ommon Nam Status hok obb DKalb Fosyth Fulton Gwinntt Hall Invtbats Shinyayd Pocktbook US X Bid Bald Eagl GA X X Bid Bachman's Spaow GA X Bid Pgin Falcon GA X Fish Blustip Shin GA X X Fish Highscal Shin GA X X Invtbats hattahooch ayfish GA X X X X X Invtbats Dlicat Spik GA X X Tout Stams Tout stams a classifid in accodanc with th pimay and sconday dsignations and citia dfind in Sction 15 of Gogia's Wat Us lassifications and Wat Quality Standads ( ). Stams dsignatd as Pimay Tout Stams a wats suppoting a slf-sustaining population of ainbow, Bown o Book Tout. Stams dsignatd as Sconday Tout Stams a thos with no vidnc of natual tout poduction, but a capabl of suppoting tout thoughout th ya. Th hattahooch upstam fom Intstat 2 Wst Bidg is th only wat dsignatd as a sconday tout stam within th Mto Wat Distict of th Upp hattahooch Basin. Land Us and Impaid Watbodis haactistics Dinking Wat Supply Th Upp hattahooch Basin is th pimay dinking wat supply souc fo th Mto Wat Distict, poviding wat to all o pats of ight Distict countis, including th fou most populous: obb, DKalb, Fulton and Gwinntt. Withdawals fom this basin account fo 72 pcnt of th Distict s total public wat supplis. cognizing th linkag btwn watshd managmnt and wat quality fo wat supply, th Gogia Planning Act of 1989 includs nvionmntal planning citia (o Pat V citia) to potct natual soucs, such as wtlands, stam buffs, wat supply watshd aas, goundwat chag aas, potctd s and potctd mountains. Tabl U-4 lists th wat supply soucs and Figu U-2 shows thos wats that a dsignatd to mt stat dinking wat citia within th Upp hattahooch Basin. Tabl U-4. Upp hattahooch Basin Dinking Wat Supply Soucs Wat Supply Souc Own/Opato Utilizing Souc hattahooch obb ounty-maitta Wat Authoity DKalb ounty ity of Atlanta PAGE U-5 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT APIL 2017

6 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE Atlanta - Fulton ounty Wat soucs ommission Lak Lani ity of umming Fosyth ounty Gwinntt ounty ity of Bufod ity of Gainsvill Big k ity of oswll PAGE U-6 APIL 2017 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT

7 FIGUE U-2 Upp hattahooch Basin Dinking Wat Stam Sgmnts Towns abun Union Fannin Gilm Whit Habsham Fl at ETOWAH East Fok Littl Wst Fok Littl Wahoo k Dawson Nlson Stphns t st a h Pickns ha k tta ho oc h Lumpkin HATTAHOOHEE lmont Fanklin Lula 9 Banks Ball Gound Walska 5 «Gainsvill 19 ah w Flat k Et o anton hok Oakwood LAKE SIDNEY LANIE Madison Flowy Banch k umming Gillsvill Hall Bi g Holly Spings Littl Woodstock Milton Mountain Pak obb Fosyth h ooc ha tta Doavill Lilbun hambl Gayson Bookhavn Snllvill Atlanta Pacht Fulton lakston k Dcatu k Nocoss Lawncvill h Na y nc OONEE Baow Dacula lac Bkly Lak Aubun y h Gwinntt a Ap Dunwoody Duluth ov oc c Al ho h Pacht ons Smyna 2 Bufod Suwan Johns k a hatt Sandy Spings Suga Hill Alphatta oswll Maitta Jackson st Havn Pin Lak Avondal Estats Walton OMULGEE Ston Mountain DKalb 0 Lithonia 5 10 ± 20 Nwton Mils lak Lgnd Dinking Wat Stam Dinking Wat Supply Watshd Ocon Dinking Wat Lak Stams Intstat Highways Upp hattahooch Mto Wat Distict ountis Distict itis Mogan Gn

8 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE Souc wat assssmnts w pfomd fo all dinking wat supplis within th Upp hattahooch Basin as quid by EPA. Th souc wat assssmnts dtmind th potntial fo pollution basd on a numb of watshd chaactistics and assignd a suscptibility anking to ach souc. Th suscptibility ankings thoughout th basin w gnally mdium to high dpnding on th location of th wat souc. Ths suscptibility ankings indicat th uban and sububan natu of most of th watshds within th Upp hattahooch Basin. Land ov/land Us Th southn xtnt of th Upp hattahooch Basin, downstam of Lak Lani, tansitions fom a pdominantly sububan chaact in Fosyth, Gwinntt and Noth Fulton to th mo dnsly dvlopd mploymnt aas of Pimt nt and obb Gallia. In addition to including sttchs of all of th majo tanspotation coidos, auto and ail, in th gion, potions of Pacht k dain som of th most dnsly dvlopd aas in th Mto Wat Distict, ncompassing downtown and midtown Atlanta, Buckhad and Dcatu. Ovall, th basin within th Distict is pdominantly sidntial (37 pcnt) with about th sam pcntag of fostd aa (Tabl U-5, Figu U-3). Tabl U-5. Upp hattahooch Basin Land ov / Land Us within th Mto Wat Distict Land ov/land Us 2012 Existing (%) Agicultual Lands 9 ommcial 13 Fost/Opn Spac 35 High Dnsity sidntial 4 Industial/Institutional 1 Low Dnsity sidntial 9 Mdium Dnsity sidntial 24 Tansitional/Extact Lands 2 Tanspotation and Utilitis 2 Wat/Wtlands 1 Undvlopd 46 Dvlopd 54 Nots: Undvlopd = Agicultual, Fost / Opn Spac and Wat / Wtlands Data Souc: Agggatd Land ov catgois fom A's 2012 LandPo Gogaphic Infomation Systm (GIS) Ov th cous of th planning hoizon, th basin is xpctd to hav stady gowth basd on population pojctions. Much of this gowth is anticipatd to occu in th nothast potion of th basin in Fosyth, Gwinntt and Hall ountis whil infill dvlopmnt and dvlopmnt sulting in incasd dnsity is xpctd to continu in obb, DKalb and Fulton ountis basd on cunt land-us data. PAGE U-8 APIL 2017 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT

9 FIGUE U-3 Upp hattahooch Basin 2012 Land ov Towns abun Union Fannin Gilm Whit Habsham HATTAHOOHEE Lumpkin Stphns Pickns Dawson ETOWAH 575 Fosyth HEOKEE 575 HALL Hall 400 «ETOWAH Banks 9 FOSYTH hok LAKE SIDNEY LANIE OONEE Madison Jackson Lgnd Mto Wat Distict ountis 2012 Distict Land ov OBB Agicultual Lands Baow «400 « FULTON DEKALB DKalb lak High Dnsity sidntial Mdium Dnsity sidntial OMULGEE 2 ommcial / Industial Institutional Gwinntt GWINNETT Fost / Opn Spac OMULGEE 20 Nwton ± Walton Mils Low Dnsity sidntial Ocon Tansitional / Extact Lands Tanspotation and Utility Wat / Wtlands Upp hattahooch Mogan HU-8 Bounday Intstat Highways

10 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE Effct Impvious Aas Th lvl of watshd impviousnss has long bn linkd to impacts on changs in hydologic gims that lad to incasd intnsity and fquncy of pak stomwat flows, which affct stam stability, wat quality and aquatic habitat and biotic community intgity. In gnal, th most snsit aquatic oganisms a affctd at impvious lvls gat than 10 pcnt. Btwn 11 and 25 pcnt of most stam communitis bcom impactd, and ov 25 pcnt of stams a gnally no long abl to suppot viabl biotic communitis (Schul, 2001). Impvious sufacs (such as oofs, stts, paking lots) hav a significantly diffnt hydologic spons fom pvious sufacs (lawns, fosts); thfo, it is impotant to claly dfin tms and assumptions latd to th calculation of pvious and impvious aas fo th puposs of watshd managmnt. Total impvious aa quantifis all of th land sufacs impvious to ainfall fo th paticula land cov catgoy whil ffct impvious aa (EIA) fs to th dictly connctd impvious aa usd fo wat quality and stomwat convyanc modling. Fo th 2003 Distict-wid Plan, EIA valus w initially dfind basd on pvious studis, including th local watshd assssmnts, and thn futh find basd on calibation using availabl wat quality data. Fo th 2016 Distict-wid Plan, th EIA of th HU-12 subwatshds within th Mto Wat Distict was calculatd using th sam mthodology as in 2003, but using th 2010 land us / land cov. Attachmnt 10 lists HU-12 watshd numbs and dsciptions. Of th 41 HU-12s within th Mto Wat Distict potion of Upp hattahooch Basin, 23 had an EIA gat than 10 pcnt, pimaily thos HUs that ith staddl a majo tanspotation coido such as Gogia 400 o Intstat o th HUs locatd within th mo dnsly ubanizd aa of I-2. Upstam of Bufod Dam, th Lak Lani dainag aa had two HU-12s gat than 10 pcnt EIA, including Flat k in Gainsvill and th subwatshd just to th ast of th ity of umming, which includs Bufod Dam. Th is on HU-12, Lvl k, locatd in Gwinntt ounty in th Upp hattahooch Basin downstam of Bufod Dam, that dos not hav an EIA gat than 10 pcnt. Th ffcts of th gion's tanspoation coidos a also appant as most of th subwatshds ncompassing Intstat, Intstat 75 and Intstat 20 hav EIAs gat than 20 pcnt (Figu U-4). ombind-sw Ovflow Aas ombind-sw ovflow (SO) aas within th Upp hattahooch Basin a limitd to two small dainag aas within th Pacht k (HU-12 # ) subwatshd in th ity of Atlanta. Majo infastuctu impovmnt pojcts latd to potntial SO ovflows fom th Tanyad k and la k aas duing stom vnts as wll as sanitay sw ovflows (SSOs) fom th wastwat convyanc systms a ongoing and continu to duc th bactia contibutions fom ths soucs. Impaid Watbodis Th Gogia EPD dtmins whth a watbody is suppoting its dsignatd uss by collcting wat quality data and compaing ths data against th wat quality citia. Gogia EPD dscibs thi listing mthodology and pfd minimum datast at This mthodology is impotant to undstand th sampl siz, xtnt and timfam of th datast that was usd to list a watbody. Fdback can b gn to Gogia EPD if additional data o infomation a known that may affct futu sampling o listing valuations. Of th 399 stam mils assssd in th Mto Wat Distict potion of th Upp hattahooch Basin, 343 mils o 86 pcnt, did not mt stat wat quality standads basd on th (d) list. Th stams listd as not suppoting a summaizd in Tabl U-6 by paamt and gaphically shown in PAGE U-10 APIL 2017 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT

11 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE Figu U-5. Sval stams a listd fo violations of mo than on paamt, thfo th summation of impaid mils by paamt will not qual th mils of not suppoting stam. Th majoity of assssd stams (75 pcnt) in th Upp hattahooch Basin do not mt wat quality standads fo fcal colifom bactia as a sult of nonpoint souc pollution. Ths bactia nt th stam fom both anthopognic and non-anthopognic soucs, including SSOs, laking sw lins, failing sptic systms and pt/ wildlif wast. Fcal colifom typically is found in both dvlopd and undvlopd watshds, and monitoing pogams in Gogia hav found lvls that xcd stat standads in uban, agicultual and fostd aas (Gogia EPD, 2011). Whil fcal colifom is ubiquitous in stams acoss th county (Gogia EPD, 2011), concntations of bactia can incas as a sult of th high dnsity of potntial pollutant soucs and dcasd stomwat filtation and stomwat tatmnt fom population gowth and dvlopmnt. Biota listings typically indicat high sdimnt loads in stams, which dcas habitat quality fo bnthic macoinvtbats and fish. Sdimnt soucs includ unoff fom constuction sits as wll as fom stambank osion du to acclatd stamflow vlocitis fom impvious cov associatd with ubanization. Woodall k, a th-mil long tibutay to Pacht k in Atlanta, is listd fo fcal colifom, copp, zinc, lad and ttachloothyln (PE) violations whil a on-mil long tibutay to Woodall k is also listd fo copp, zinc and alpha-bnzn hxachloid (BH) and bta-bh, bypoducts of th poduction of th inscticid lindan (γ-hh). PE is th pdominant chmical solvnt usd in dy claning. Tibutay #2 to Sop k in obb ounty is also listd fo PEs. Th hattahooch fom Mogan Falls Dam to Wst Point Lak, downstam of th Mto Wat Distict, is listd fo Fish onsumption Guidanc as a sult of lgacy polychloinatd biphnyl (PB) lvls. PAGE U-11 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT APIL 2017

12 FIGUE U-4 Upp hattahooch Basin HU-12 Effct Impvious Aas (EIA) Towns abun Union Fannin Gilm Whit Habsham HATTAHOOHEE Lumpkin Stphns Pickns Dawson 9 ETOWAH Banks 5 «19 Fosyth Hall hok Jackson OONEE obb Lgnd Baow Effct Impvious Aa lak Gwinntt 0%-5% 5%-10% 10%-15% 2 Fulton Walton DKalb OMULGEE Nwton ± 20 Mils 15%-20% Ocon >20% Upp hattahooch Mto Wat Distict ountis HU 12 Bounday Mogan Intstat Highways

13 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE Tabl U-6. Upp hattahooch Basin Summay of Impaid Stams ition Violatd Mils of Stam % of 2014 Assssd Stams Fcal olifom Bactia Biota (Fish ommunity) Biota (Macoinvtbat ommunity) Fish onsumption Guidanc (PBs) ,1-Dichloothyln 6 1 Toxicity 6 2 PE 5 1 opp 4 1 Lad 3 1 Dissolvd Oxygn 3 1 Zinc 3 1 Alpha-BH and Bta-BH 1 <1 Total Impaid Stam Milag a Total Milag Assssd fo Possibl Impaimnt 399 a Sval stams a listd fo violations of multipl paamts within th sam stam sgmnt; thfo, th total of impaid mils by paamt will not qual th total stam milag of impaid stams. PAGE U-13 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT APIL 2017

14 FIGUE U-5 Upp hattahooch 305(b)/303(d) Listd Wats Towns abun Union Fannin Gilm Whit Habsham HATTAHOOHEE ETOWAH Nlson East Fok Littl oc Stphns ha Wst Fok Littl Wahoo k Dawson tta Fl at at st h Pickns ho k h Lumpkin lmont Lula 9 Banks Ball Gound Walska 5 «Gainsvill 19 ah w Flat k Et o anton hok Oakwood LAKE SIDNEY LANIE Madison Flowy Banch k umming Gillsvill Hall Li ttl Bi g Holly Spings Woodstock Milton Mountain Pak obb h Lawncvill Fulton Lilbun hambl Gayson Bookhavn Pacht Snllvill k lakston Dcatu Not Suppoting Doavill Suppoting Atlanta k Pin Lak Avondal Estats Ston Mountain DKalb 0 Lithonia 5 Walton OMULGEE 10 Nwton lak 2014 Listd Wats Nocoss Lgnd h oc n Na cy OONEE Baow Dacula ho Bkly Lak lac Dunwoody Sandy Spings Aubun Gwinntt a Ap Pacht ons Duluth y tta oc h ov ha Bufod c Al Smyna 2 Suga Hill Suwan Johns k ho hatta st Havn Alphatta oswll Maitta Jackson Fosyth ± 20 Mils Assssmnt Pnding Ocon Stams Intstat Highways Upp hattahooch Mto Wat Distict ountis Distict itis Mogan

15 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE Lak Lani has a dsignatd us of cation and Dinking Wat with cosponding chloophyll a and total nitogn citia. Sixtn pcnt of Lak Lani at Bowns Bidg oad (S 369) is listd as not suppoting its dsignatd uss of cation and Dinking Wat du to not mting stat wat quality standads fo chloophyll a. An additional 13 pcnt of th lak (at Lani Bidg oad) is pnding assssmnt. A total of 68 pcnt of Lak Lani is listd as suppoting its dsignatd us. Gogia EPD conductd modling to stablish Total Maximum Daily Loads (TMDLs) to addss ths xcdancs and Gogia EPD found th gowing sason avag chloophyll a citia at Bowns Bidg and Flowy Banch ndd to b visd basd on modling an all fostd watshd. Gogia EPD has valuatd and visd th chloophyll a citia at ths locations (Gogia EPD, 2013). TMDLs and TMDL Implmntation Plans hav bn dvlopd to hlp juisdictions addss impaid stams and laks and spcific paamts of concn. Mo infomation on spcific TMDLs in th Upp hattahooch Basin can b found on th Gogia EPD wbsit Managmnt Issus and commndations Initial Scning of Pioity Aas Within th Mto Wat Distict, th poposd implmntation actions will vay among basins dpnding on th xisting land uss, wat quality, stam and watbody condition and oth watshd-spcific managmnt issus. Th timfam fo implmntation will also vay basd on a vaity of factos such as TMDL listings, psnc of souc wat watshds and potntial fo significant dvlopmnt in th futu. Pioity aas, also known as citical aas p EPA guidanc, w idntifid at th Mto Wat Distict lvl by HU-12 watshd as an initial scning to nabl communitis to pfom mo dtaild pioitizations on a subwatshd basis. Th pioity aas w idntifid at th HU-12 lvl in Tabl U-7 if thy includ a stam o watbody with a TMDL, wat supply watshds o xisting EIA gat than 10 pcnt. Tabl U-7. Upp hattahooch Basin Initial Scning of Pioity Aas Basd on HU-12 Watshds Total HU-12 Watshds (Upp hattahooch Basin) Watshds that includ a TMDL Wat Supply Watshds a Existing Effct Impvious ov (EIA > 10%) Pcnt of Total Watshds 90% 90% 56% a Wat Supply Watshds psnt HU-12 watshds that dain to a wat supply intak. Many of th HU-12s do not actually contain any wat supply intaks. Managmnt Issus and commndd Statgis Tabl U-8 outlins managmnt issus and statgis fo th Upp hattahooch Basin within th Mto Wat Distict. Th commndd statgis psntd in Tabl U-8 a basd on data psntd within this Basin Pofil. Ths statgis a povidd to futh dscib th potntial causs and potntial solutions to th watshd issus. Thy povid a foundation fo guidanc, but a not psntd h as mandatoy quimnts. PAGE U-15 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT APIL 2017

16 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE Tabl U-8. Upp hattahooch Basin Managmnt Issus and commndd Statgis Managmnt Issu Dsciption commndd Statgis Souc wat quality Nutint loading Incass in impvious cov (nw dvlopmnt) Souc wat watshd potction of Lak Lani, hattahooch and small wat supply watshds. TMDL nutint concntations in Lak Lani Potions of Lak Lani hav not mt th chloophyll a standads. Uban nutint loading ductions will potntially b ndd to sto Lak Lani to its dsignatd us. Agicultual nutint loading ductions will potntially b ndd to sto Lak Lani to its dsignatd us (Gogia EPD, 2013). Incass in impvious cov can lad to a chang in th hydologic gim of a watshd by causing mo intns, high-vlocity stomwat flows and incasd osion and sdimntation. 23 (56%) HU-12 watshds with EIA of > 10% 12% shift fom undvlopd to dvlopd land cov ( ). Implmnt souc wat potction masus in all subwatshds daining to Lak Lani. Implmnt souc wat potction masus in all subwatshds. ontinu collaboat ffots in small dinking wat supply watshds, such as Big k, to potct th viability of ths supplis. Implmnt post-constuction stomwat contols and infiltation pactics to duc NPS pollutants associatd with multipl land uss, paticulaly sububan/uban and agicultual. Educat th public on NPS pollution duction and pop ftiliz application and th impacts of xcss nutints on th lak and local conomy. Evaluat stictions on sal of ctain ftilizs. oodinat with Gogia EPD NPS Pogam to dvlop nutint managmnt plans and statgis to duc nutint loading fom animal fding opations in concntatd poduction gions. Paticipat in ffots to ducat agicultual stakholds about th impotanc of implmnting Bst Managmnt Pactics fo Gogia Agicultu Manual fo animal poduction facilitis (poulty) and gazing opations. oodinat with Gogia Dpatmnt of Agicultu Lstock/Poulty Sction on inspctions, complaint invstigations, nutint managmnt plan viws, pmit administat suppot and nfocmnt assistanc (Gogia EPD, 2014). oodinat with countis upstam of Lak Lani (Dawson, Habsham and Whit ountis) in nutint managmnt ffots. Nonpoint souc pollution managmnt Adopt and nfoc th post-constuction stomwat contol odinanc and us of Gogia Stomwat Managmnt Manual dsign standads. Watshd impovmnt pojcts, such as stam stoation and bank stabilization, a commndd in aas to duc instam sdimnt load contibutions. PAGE U-16 APIL 2017 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT

17 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE Tabl U-8. Upp hattahooch Basin Managmnt Issus and commndd Statgis Managmnt Issu Dsciption commndd Statgis Inadquat stomwat contols on xisting impvious cov Aquatic soucs Biota TMDLs Bactia TMDLs Much of th dvlopmnt in th basin occud pio to cunt Gogia Stomwat Managmnt Manual dsign standads. Limitd soucs and cost of maintaining and paiing stomwat infastuctu Vaying local statgis of funding stomwat managmnt Th hattahooch upstam fom I-2 Wst Bidg is a dsignatd sconday tout stam. 38% of assssd instam fish communitis and 10% of th bnthic macoinvtbat communitis a impaid. Biota impaimnt in this basin a th sult of high sdimnt loads, pimaily associatd with xisting dvlopmnt with inadquat stomwat contols, which is a concn fo dinking wat souc supplis, biota and cation. 75% of assssd stam sgmnts in th hattahooch Basin (within th Mto Wat Distict) a listd fo fcal colifom. Implmnt an asst managmnt pogam to idntify and pioitiz maintnanc and capital impovmnt pojcts to maximiz bnfit onsid updating stomwat contols duing dvlopmnt Idntify oppotunitis fo watshd impovmnt pojcts to tofit o install updatd stomwat contols, gn infastuctu, stomwat tatmnt o oth contols. onsid ddicatd funding soucs, such as stomwat utilitis, and sk out oppotunitis fo gants, loans and patnships. Balanc nonpoint souc tmpatu inputs fom its tibutais with cold wat lass fom Bufod Dam to mt sconday tout stam citia. Enfoc post-constuction stomwat odinanc on nw dvlopmnt and sk oppotunitis to tofit stomwat contols to maximiz wat quality and channl potction. commnd watshd impovmnt pojcts, such as stam stoation and stambank stabilization, in aas with failing stam banks to duc instam sdimnt load contibutions. Idntify bactia soucs though inspctions, monitoing, souc tacing and stam walks. Educat public on pollution pvntion, pop sptic systm maintnanc and poting a potntial illicit dischag. Addss fcal colifom bactia contibutions fom SSOs as outlind in th Wastwat Managmnt Plan. Addss bactia loads fom agicultual soucs as thy a idntifid. Pfom gula maintnanc to nsu pop functioning of dcntalizd systms (such as sptic tanks). Ongoing infastuctu impovmnt pojcts latd to duction of potntial SO ovflows. NPS = nonpoint souc pollution PAGE U-17 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT APIL 2017

18 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE Tabl U-8. Upp hattahooch Basin Managmnt Issus and commndd Statgis Managmnt Issu Dsciption commndd Statgis Lak managmnt Lak Lani is th lagst lak within this basin, but th a oth public and patly-hld and managd laks that play a significant ol in mting dsignatd uss and downstam hydologic gims and wat quality. Dvlop a cntal invntoy of laks, ownship and managmnt pactics to facilitat pollutant souc idntification both up and downstam of th lak. oodinat availabl wat quality data and managmnt actitis fo invntoid laks. Implmnt sholin potction and upstam sdimnt managmnt to pvnt xcss nutints and sdimntation within th lak. Facilitat pop maintnanc and managmnt, paticulaly of small laks by poviding soucs, links o oth matials to assist with piodic actitis such as inspctions, wat quality sampling o ddging. onduct public ducation and involvmnt actitis to pomot watshd stwadship to potct lak quality. Idntify Indicatos and Monitoing to Masu Implmntation Succss A citical componnt of any watshd managmnt pogam is th ability to assss pogss and dtmin if managmnt statgis a ffctly addssing issus. This Plan includs implmntation actions latd to watshd monitoing and conducting condition assssmnts to valuat implmntation succss. Ths implmntation actions includ long-tm ambint tnd monitoing (5.F.1) and habitat and biological monitoing (5.F.2), as wll as souc-spcific implmntation actions fo TMDL Managmnt (4.H.2). ommunitis may choos to conduct pojct-spcific monitoing associatd with a watshd impovmnt pojct, such as biological o gomophological monitoing to valuat succss. As includd in EPA (2008), a monitoing pogam should tack pogss in mting load duction goals and attaining wat quality standads and oth goals. Masuabl pogss is citical to nsuing continud suppot of watshd pojcts, and pogss is bst dmonstatd with th us of monitoing data that accuatly flct wat quality conditions lvant to th idntifid poblms. Monitoing pogams should includ baslin (bfo), pojct-spcific (duing) and post-pojct (aft) monitoing. Som potntial indicatos to masu implmntation succss fo th Upp hattahooch Basin a listd as follows, but this list is not xhaust: Slct psntat monitoing stations within th watshd to monito fo pollutants of concn and oth wat quality o biological paamts. Us U.S. Gological Suvy stam gag data o collct data to stablish stam stag-dischag lationships and calculat o modl wat quality pollutant loads and potntial ductions. alculat o modl impovmnts to hydologic and hydaulic conditions basd on stuctual pojct implmntation. Estimat stam/lak bank stability and habitat impovmnt basd on annual stam coss sction suvys and bank osion monitoing. onduct stam/lak walks o stuctu inspctions to invntoy stuctu condition and pfomanc, stambank stability and ipaian condition ov tim. onduct pojct monitoing to stablish p-, duing- and post-pojct conditions, as wll as upstam/downstam monitoing duing th sam tim piod to duc th ffcts of nvionmntal vaiability. PAGE U-18 APIL 2017 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT

19 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE To dtmin if wat quality dgadation is bing pvntd, conduct GIS analysis to idntify highactity aas of a watshd using aial ovlays, wok ods, facility inspction, osion and sdimntation contol o nw constuction inspction data. Idntify if monitoing data and GIS data follow simila pattns. Tack numb, location, siz o fatus (that is, dainag aa tatd o lina ft of stod stam) of watshd impovmnt, gn infastuctu o oth nonpoint souc duction pojcts. ompa pcntag of TMDL stam/lak sgmnts ov tim. Tack implmntation actions by juisdiction within th basin, and thi masud ffctnss. Tack nfocmnt actions by catgoy and location. Tack stam/lak buff vaiancs and local pmits issud. onduct public suvys fo pollution pvntion awanss o ducation ffctnss, paticulaly pand post-data associatd with an ducation vnt. ompa xisting wat quality modld loads against futu wat quality modld loads. Spctal analysis is an mging option to assss wat quality. PAGE U-19 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT APIL 2017

20 ATTAHMENT 1 HATTAHOOHEE IVE BASIN POFILE This pag lft intntionally blank. PAGE U-20 APIL 2017 METOPOLITAN NOTH GEOGIA WATE PLANNING DISTIT