HIST O RY O F PFA S IN T HE PL A INFIEL D T O WNSHIP WA T ER - PowerPoint PPT Presentation

HIST O RY O F PFA S IN T HE PL A INFIEL D T O WNSHIP WA T ER SYST EM

UNRE GUL AT E D CONT AMI NANT MONI T ORI NG RUL E 3 (UCMR3) Sinc e 1996, a ll la rg e wa te r syste ms ha ve • b e e n re q uire d to te st fo r a list o f a b o ut 30 ne w c o nta mina nts e ve ry 5 ye a rs. T he c o nta mina nt list is pre pa re d b y the • E PA a nd inc lude s b o th c he mic a ls a nd viruse s. • T he E PA use s the da ta fro m this na tio nwide te sting to de ve lo p re g ula to ry de c isio ns. T he third ro und o f te sting b e g a n in 2013 • a nd inc lude d six PF AS c he mic a ls.

UCMR3 T E ST I NG T I ME L I NE June 2013 F irst sa mple s o f o ur wa te r ta ke n fo r the 30 c o nta mina nts • Se pt 2013 Se c o nd sa mple se t ta ke n • • De c 2013 T hird sa mple se t ta ke n Ma rc h 2014 F ina l sa mple s ta ke n fo r the 30 c o nta mina nts • Aug ust 2014 Re sults o f o ur te sts a re ve rifie d a nd sub mitte d to the E PA • Ja nua ry 2017 E PA re le a se s fina l re sults o f na tio nwide UCMR3 te sting •

VE RSL UI S WE L L F I E L D OPE RAT I ON T I ME L I NE • Histo ric a lly Ve rsluis We ll F ie ld wa s o nly use d during the pe a k summe r se a so n. T he Ve rsluis We ll F ie ld wa s in o pe ra tio n fo r the first 2 o f the 4 UCMR 3 • sa mpling e ve nts in 2013/ 2014. T he Ve rsluis We ll F ie ld wa s o pe ra te d no rma lly during the summe rs o f 2014 • a nd 2015 a nd wa s shut do wn o n Oc to b e r 1, 2015. Ba se d o n ne w info rma tio n re g a rding PF AS a ro und the sta te , we de c ide d in • the winte r o f 2015/ 2016 tha t we wo uld te st the Ve rsluis We lls dire c tly. I n Ma rc h 2016 we te ste d the ra w wa te r a t Ve rsluis a nd fo und e le va te d • le ve ls. At tha t time we ma de the de c isio n to ke e p the Ve rsluis We lls shut do wn fo r the summe r o f 2016.

GOI NG F ORWARD PF AS Mo nito ring • Sinc e shutting do wn the Ve rsluis We ll F ie ld we ha ve b e e n sa mpling a nd te sting fo r the le ve ls o f PF AS in the wa te r tha t le a ve s o ur pla nt. T he le ve l o f PF OS+PF OA o ve r tha t pe rio d ra ng e d fro m 4.9 to 10.3 • ppt with a n a ve ra g e o f 8.5 ppt. Due to the me a sure me nt b e ing in pa rts pe r trillio n, the le ve ls o f • PF OS+PF OA we ha ve se e n o ve r time a re c o nside re d to b e sta b le .

GOI NG F ORWARD Ne w We ll F ie ld • I n 2016 we b e g a n the pro c e ss to find a lo c a tio n fo r a ne w we ll fie ld to re pla c e the c a pa c ity we lo st whe n we c lo se d the Ve rsluis We ll F ie ld. We b e g a n the disc ussio ns inte rna lly a nd q uic kly de te rmine d tha t we ne e de d • to hire a n o utside c o nsulta nt to a ssist us. • I n 2017 we a ppro pria te d funds fo r o ur e ng ine e rs to inve stig a te suita b le g ro undwa te r so urc e s a nd he lp us lo c a te pro pe rty tha t c o uld b e use d. Out o f tha t inve stig a tio n we na rro we d do wn to a n a re a tha t a ppe a re d • suita b le fo r a ne w we ll fie ld. Ho we ve r, sho rtly the re a fte r it wa s de te rmine d tha t the c o nta mina tio n plume fro m the Ho use Stre e t site e xte nde d to this a re a . We ha ve sinc e fo und a se c o nd site tha t we a re in the pro c e ss o f do ing a n • hydra ulic a na lysis o n a nd ho pe to ha ve a ne w we llfie ld unde r de ve lo pme nt in the ne xt 12 mo nths.

GOI NG F ORWARD T re a tme nt fo r PF AS Our pre vio us tre a tme nt pro c e ss wa s no t e ffe c tive fo r re mo ving PF AS. • Alo ng with o ur e ng ine e rs, the wa te r pla nt o pe ra to rs b e g a n re se a rc hing • a lte rna tive me tho ds a va ila b le to tre a t fo r PF AS. • Disc ussio ns we re ha d with o the r tre a tme nt pla nts tha t ha ve PF AS pre se nt o r a re c urre ntly utilizing tre a tme nt me tho ds tha t we a re c o nside ring . F a c to rs tha t we re c o nside re d whe n lo o king a t the a lte rna tive s inc lude d: • T ra c k re c o rd o f the tre a tme nt me tho d 1. E ffe c tive ne ss o f tre a tme nt me tho d fo r a wide ra ng e o f c o nta mina nts 2. Ac c e pta b ility to the MDE Q fo r pe rmitting purpo se s 3. Ong o ing c o st to ma inta in the tre a tme nt syste m 4. I nitia l c o st to inc o rpo ra te the tre a tme nt syste m 5.

T ODAY T re a tme nt fo r PF AS T ha nks to a $750,000 g ra nt fro m the sta te to pe rfo rm a pilo t study, we ha ve • b e e n a b le to c o nve rt o ve r ha lf o f o ur maximum tre a tme nt c a pa c ity to g ra nula r a c tiva te d c a rb o n (GAC) filtra tio n. As pa rt o f this pilo t study we ha ve b e e n a b le to do e xte nsive te sting o f o ur ra w • wa te r, o f the wa te r a t diffe re nt po ints in the tre a tme nt pro c e ss a nd o f the wa te r le a ving the pla nt fo r the distrib utio n syste m. T e st o utc o me s to da te inc lude : • T he to ta l PF AS in the wa te r c o ming into o ur pla nt is ~ 45 ppt (9 ppt PF OA+PF OS). 1. T he to ta l PF AS in the wa te r le a ving o ur pla nt is c urre ntly no n-de te c t fo r PF AS. 2. T he a ntic ipa te d life o f the c a rb o n in o ur filte rs is 3+ ye a rs. 3. Whe n it c o me s time to re pla c e the c a rbo n, the e xisting g e ts inc ine ra te d a t 4. a ro und 1,800° F , whic h de stro ys the PF AS a nd re a c tiva te s the c a rb o n.

ONS? I ST QUE