Riva nna Wa te r a nd Se we r Autho rity Re se rvo ir Ma na g e me - PowerPoint PPT Presentation

Riva nna Wa te r a nd Se we r Autho rity Re se rvo ir Ma na g e me nt Stud y Ma y 24, 2016

RWSA Re se rvo ir Ma na g e me nt Stud y T e a m • K e lly DiNa ta le , DiNa ta le Wa te r Co nsulta nts, Pro je c t Ma na g e r • Dr. Ale xa nde r J. Ho rne , Ale x Ho rne Asso c ia te s, T e c hnic a l Dire c to r a nd L imno lo g ist • RWSA Sta ff • Andre a T e rry, Wa te r Re so urc e s Ma na g e r, Autho rity Pro je c t Ma na g e r • Stua rt Wilso n, L a b o ra to ry Dire c to r • Dr. Ric ha rd Gullic k, Dire c to r o f Ope ra tio ns • Da vid T ung a te , Wa te r Ma na g e r • K o nra d Ze lle r, Wa te r T re a tme nt Pla nt Supe rviso r • L a b o ra to ry sta ff • Wa te r T re a tme nt sta ff 2

RWSA Re se rvo ir Ma na g e me nt Stud y Pro je c t Ob je c tive s 3

Why d id we d o this Pro je c t? • Sig nific a nt a lg a e b lo o ms a t Be a ve r Cre e k a nd So uth F o rk re se rvo irs • Alg a e c a n c a use pro b le ms suc h a s ta ste a nd o do r c o mpo unds, c ya no to xins, na tura l o rg a nic ma tte r (DBP pre c urso rs), filte r c lo g g ing , a nd a lso ha ve re c re a tio na l impa c ts • Che mic a l tre a tme nts a re re q uire d to ma na g e a lg a e • Are the re b e tte r o r mo re e ffe c tive a ppro a c he s to ma na g ing wa te r q ua lity c o nc e rns? 4

So uth Fo rk Riva nna Blo o m – Aug 21, 2015 5

C he mic a l tre a tme nt histo ry fo r 2014 - 2015 2014 No. Of 2015 No of Applic ations 2014 Cost Applic ations 2015 Cost Be a ve r Cre e k 5 $ 46,477 4 $ 32,628 So uth F o rk Riva nna 0 $ - 5 $ 37,200 Sug a r Ho llo w 0 $ - 1 $ 3,300 Ra g g e d Mo unta in 2 $ 12,615 6 $ 15,110 T o tie r Cre e k 0 $ - 1 $ 5,946 T o tal 7 $ 59,092 17 $ 94,184 6

Pro je c t O b je c tive s E va lua te e xisting wa te rshe d a nd re se rvo ir da ta 1. I de ntify fa c to rs a nd so urc e s o f e xisting o r po te ntia l 2. wa te r q ua lity c o nc e rns prima rily re la te d to a lg a e De ve lo p a mo nito ring pla n fo c use d o n e sta b lishing 3. b a se line da ta fo r lo ng -te rm tre nding De ve lo p stra te g ie s fo r ma na g e me nt o f wa te r q ua lity 4. in e a c h re se rvo ir Re c o mme nd a dditio na l studie s a s a ppro pria te 5. 7

De sire d O utc o me s 1. Pro te c tio n a nd impro ve me nt o f re se rvo ir wa te r q ua lity fo r impro ve me nt o f: • Wa te r tre a tme nt o pe ra tio ns • F inishe d wa te r q ua lity • Re c re a tio na l o ppo rtunitie s 2. Re c o mme nd a lte rna tive s to c he mic a l tre a tme nts to the e xte nt pra c tic a b le a nd a ppro pria te 8

RWSA Re se rvo ir Ma na g e me nt Stud y Re se rvo ir a nd Wa te rshe d Mo nito ring 9

Re se rvo ir wa te r c o lumn sa mp ling Putting wate r fr om de e p-wate r sample r into pr e -labe le d bottle 10

La ke p ro file - YSI So nd e Pr e par ing to lowe r YSI E XO2 Sonde into South F or k R ivanna R e se r voir 11

RWSA Re se rvo ir Ma na g e me nt Stud y Mo nito ring Re sults Summa ry 12

RWSA Re se rvo ir Wa te rshe d s • All five re se rvo irs sa mple d • Pre limina ry wa te rshe d sa mpling • F irst prio ritie s a nd mo st sig nific a nt issue s a re a t Be a ve r Cre e k a nd So uth F o rk Riva nna re se rvo irs 13

Sug a r Ho llo w, Ra g g e d Mo unta in a nd T o tie r C re e k Re se rvo irs Conc e rns R e c omme ndations • • Pristine wa te rshe d Co ntinue d mo nito ring to Sugar • ye t o ne ma jo r a lg a e de ve lo p b a se line wa te r q ua lity a nd tre nds Hollow • b lo o m in 2015 de te rmine if 2015 wa s a n a b e rra tio n • • re se rvo ir le ve l Che mic a l tre a tme nts a s re q uire d • wa s ve ry lo w I f a lg a e b lo o ms inc re a se , e va lua te o the r • o xyg e n a lso ma na g e me nt stra te g ie s ve ry lo w • • Pristine wa te rshe d Co ntinue d mo nito ring to de ve lo p b a se line R agge d with o c c a sio na l wa te r q ua lity a nd tre nds Mountain • flo a ting a lg a e Che mic a l tre a tme nts a s re q uire d • I f a lg a e b lo o ms inc re a se , e va lua te o the r ma na g e me nt stra te g ie s • • Hig h turb idity Use c re e k inta ke fo r wa te r supply to WT P T otie r • • I nta ke lo c a tio n Che mic a l tre a tme nts a s re q uire d to ma inta in Cre e k • Wa te r q ua lity limits re se rvo ir a s a c c e pta b le b a c kup supply use to b a c kup supply 14

Be a ve r C re e k Re se rvo ir 15

C urre nt Wa te r Q ua lity C o nc e rns in Be a ve r C re e k a nd So uth Fo rk Riva nna Re se rvo irs Pr oble m/ Conc e r n Disc ussion E a rthy & musty o do rs T aste & odor - or ganic s I ro n & ma ng a ne se re le a se d fro m se dime nts Color & staining - inorganic s Blue -g re e n a lg a e c a n c re a te ne rve a nd live r to xins Algal toxins I mpa c t filte r run time s a t wa te r tre a tme nt pla nts F ilte r c logging algae Surfa c e b lo o ms a ffe c t sho re line a nd o n-la ke re c re a tio n Impac ts to r e c r e ation and fishe r ie s L o w disso lve d o xyg e n a ffe c ts fishe rie s a nd c a n le a d to fish kills Up to a ppro xima te ly $50,000 a nnua l c o st fo r e a c h Che mic al tre atme nts re se rvo ir fo r tre a tme nt with c o ppe r a lg a e c ide Co nc e rn o ve r b uild up o f c o ppe r re sista nc e b y a lg a e a nd a c c umula tio n in re se rvo ir se dime nts 16

Be a ve r C re e k a nd So uth Fo rk Riva nna Find ing s Ba se d o n 2015 Sa mp ling • Wa te r q ua lity do mina te d b y b lue -g re e n a lg a e spe c ie s • L o we r de pths o f re se rvo ir b e c o me s a no xic (no o xyg e n) fro m June thro ug h fa ll • Nitro g e n pre se nt we ll a b o ve le ve ls ne e de d fo r a lg a e g ro wth • Pho spho rus like ly limiting nutrie nt fo r a lg a l g ro wth • Nutrie nts a ppe a r to b e c o ming fro m b o th inte rna l a nd e xte rna l so urc e s • Addre ssing wa te rshe d so urc e s o f nutrie nts is c ha lle ng ing , b ut ma y b e b e ne fic ia l • Additio na l mo nito ring ne e de d to re fine inte rna l v. e xte rna l so urc e s a nd ta rg e t ma na g e me nt me tho ds 17

Be a ve r C re e k Disso lve d O xyg e n 18

So uth Fo rk Riva nna Re se rvo ir 19

So uth Fo rk Riva nna Blo o m – July 28, 2015 20

Be a ve r C re e k a nd So uth Fo rk Riva nna Po te ntia l In-La ke O p tio ns Me thod De sc r iption E stimate d c ost • • Oxyg e na tio n o r Suppre sse s inte rna l nutrie nt lo a ding $1.1M pro je c t c o st. • a e ra tio n o f Pro vide s o xyg e n thro ug ho ut the Annua l O&M o f $25,000 hypo limnio n re se rvo ir to $50,000 • Nutrie nt Co uld re mo ve po llutio n in se dime nts • Studie s re q uire d to in to p 10 - 20 c m – o the rwise to o Se dime nt de te rmine the de pth a nd a re a l e xte nt o f Re me dia tio n c o stly nutrie nts in the • Must a ddre ss e xte rna l lo a ding fo r se dime nts lo ng -te rm e ffe c tive ne ss • Che mic a l Curre nt pra c tic e • $0 to $50,000 pe r ye a r • he rb ic ide s fo r Sho uld b e use d fo r infre q ue nt o r unle ss a lg a e b e c o me re sista nt to c he mic a ls a lg a e c o ntro l urg e nt e ve nts • Co nside r no n-c he mic a l me tho ds • Vig o ro us Mix the uppe r po rtio n o f the re se rvo ir • $0.75M to $1.2M pro je c t c o st de pe nding o n E pilimne tic to disrupt b lue -g re e n a lg a e g ro wth mixing me tho d se le c te d Mixing 21

Re c o mme nd e d Ne xt Ste p s Co ntinue with c urre nt a lg a e mo nito ring a nd a lg a e c ide 1. a pplic a tio ns until o the r me tho ds imple me nte d I mple me nt mo difie d mo nito ring pro g ra m fo r 2016 2. • E mpha sis o n Be a ve r Cre e k a nd So uth F o rk Riva nna • I nflo w sa mpling a nd flo w me a sure me nts • Co re sa mpling o f la ke se dime nts Upda te c ha rts a nd sta tistic a l a na lysis with 2016 da ta 3. Co ntinue e va lua tio ns o f in-la ke ma na g e me nt me tho ds a nd c o sts 4. Co o rdina te with so urc e wa te r pro te c tio n pla nning e ffo rts 5. Re po rt a dde ndum in e a rly 2017 6. • Re c o mme nda tio ns fo r lo ng -te rm mo nito ring • Re c o mme nda tio ns fo r in-la ke ma na g e me nt me tho ds 22

Q ue stio ns 23