Mic r omonitor ing: A Cost E ffe c tive Appr oac h for L oc - PowerPoint PPT Presentation

Mic r omonitor ing: A Cost E ffe c tive Appr oac h for L oc ating I&I in Sanitar y Se we r s Ga ry D. Silc o tt, Jr., P.E .

Ag e nda 1 Bac kgr ound and Histor y 2 Milfor d Ce nte r Ohio Mic r omonitor ing Pr ogr am 3 L ogan Ohio Mic r omonitor ing Pr ogr am 4 Jac kson Ohio Mic r omonitor ing Pr ogr am 5 Summar y / Q&A

1 Bac kgr ound and Histor y Mic ro mo nito ring wa s de ve lo pe d b y Sta nte c , to pro vide a wa y to q uic kly a nd e ffic ie ntly ide ntify upstre a m sma ll dia me te r se we rs c o nta ining so urc e s o f Inflo w a nd Infiltra tio n (I/ I) whe re tra ditio na l flo w mo nito ring me tho ds a re ine ffe c tive . Sta nte c ha s c o mple te d se ve ra l Mic ro mo nito ring pro je c ts in the pa st fe w ye a rs; he re we will hig hlig ht thre e suc c e ssful pro je c ts fo r rura l c o mmunitie s in Ohio .

What is a Micromonitor? Q = weir curve at low flow Q = AV at high flow ISCO 2150 F low Monitor with a Customize d We ir 4

Mic ro mo nito ring We ir A smooth weir

Micromonitoring Advantages • Id e ntify sig nific a nt I/ I so urc e s in sma ll se we rs • Suita b le fo r lo w flo w c o nd itio ns • No CSE (o ne -ma n c re w) • Wo rks whe re tra d itio na l mo nito rs d o no t • Allo ws fo r F o c use d SSE S • Quic kly d e plo ye d , mo ve d a nd re mo ve d L OWE R OVE RAL L COST !

Low Flow Problems Ac c ura c y De b ris No pro b le m

Domestic Usage Identified Wa she d Ha nds Sho we r Did Sho we r no t Wa sh Ha nds L o w F lush Wa shing T o ile t Ma c hine Midnig ht 6:00AM

Where is the I/I problem here? All yo u ne e d is ONE sto rm!!! 9

Monitor Mic ro mo nito r Re g io na l Mo nito r numerous T runk se we r no t MM sites to locate Mic ro mo nito re d F lo w 20 Co nne c to r the real Arro w 11 problem 46 42 43 10 045 31 34 33 06 66 27 32 03 16 30 26 05 28 04 01 No n-E xc e ssive ~ < 5 Ga l / ft / sto rm Mo de ra te ~ > 5 Ga l & < 10 Ga l / ft / sto rm L ORE - 05 E xc e ssive ~ > 10 Ga l / ft / sto rm

Results! A gas line bore d through the se we r line was found, whic h was re move d during the monitoring pe riod be low. Pre-rehab 1.17 inch Storm monitoring Post-rehab 1.29 inch Storm monitoring

Normal Tap This is what a tap look like in Dry Weather.

MH7-6 Would have been missed using just CCTV!

Infiltration Tap This is looking into the Infiltration.

I&I Can be e lusive ! Ma in L ine a nd Ma nhole s r e pla c e d but la te r a ls r e ma ine d.

2 Village of Milfor d Ce nte r 2012 Mic ro mo nito ring Pro g ra m

Village of Milford Ce nte r Unio n Co unty, OH • Se wa g e tre a te d b y City o f Ma rysville • • I/ I in sa nita ry se we r, whic h is re la tive ly ne w a nd is c o mprise d o f PVC pipe a nd pre c a st ma nho le s • Co st to tre a t flo w inc re a se d 3x d uring we t se a so n • 364 c usto me rs Smo ke te sting a nd ma nho le inspe c tio ns • c o nd uc te d d uring ra in e ve nts d id no t find I/ I Cho ic e b e twe e n CCT V a nd • Mic ro mo nito ring • Mic ro mo nito ring wa s c ho se n to pin- po int pro b le ms

Mic romonitor L oc ations 07 F M 13 08 09 02 10 01 11 12

Monitoring L oc ation 4 RG MI-04

Monitoring L oc ation 4 NO I/ I

Monitoring L oc ation 6 MI-06

Monitoring L oc ation 6 NO I/ I

Monitoring L oc ation 10 MI-13 MI-10 MI-09 MI-02 MI-11 MI-12 MI-01

Monitoring L oc ation 10 I/ I

Monitoring L oc ation 01 Wa te r Pla nt Disc ha rg e I/ I

Milford Ce nte r Sc he matic Pha se 1 Mo nito r * 06-18-12 0% (0) Pha se 2 03 Mo nito r 0.9% (0.13) 06 * Mo nito rs 01, 02, 07 we re le ft in fo r Pha se 2. Pump F M Sta tio n 0.9% (0.13) (T his sub b a sin do e s ha ve * 07 sig nific a nt infiltra tio n a fte r the sto rms.) 04 5% (1.46)? 08 13% (0.42) 13 0.8% (0.75) 0.1% (0.09) 09 0% (0) * 02 73% (10.5) 05 10 1.2% (0.08) 11 12 01 * 0.4% (0.20) Pe rc e nta g e o f Ra tio o f I -I to Pipe to ta l I -I fro m 1.1% (0.64) 9% (0.73) L e ng th, >1 (re d) sub b a sin me a ns mo re tha n a ve ra g e I -I Wa te r Pla nt 5% (1.46)

Re sults Iso la te d I nflo w so urc e s to thre e se we r pipe s in • a lle y b e twe e n So uth Mill St. a nd Ple a sa nt St. Iso la te d infiltra tio n so urc e s to thre e se we r pipe s • a lo ng the c re e k In a ll, the so urc e s we re iso la te d to 1,900’ o f • se we r o ut o f the ~30,000’ tha t ma ke up the Villa g e ’ s syste m

3 City of L ogan 2013 Mic ro mo nito ring Pro g ra m

Curre nt Situa tio n Inflow / Infiltr ation (I/ I) in the Colle c tion Syste m • I/ I in City’ s sa nita ry se we r syste m c o ntrib ute s to b a se me nt flo o d ing , o ve rflo ws, a nd infla te d o pe ra ting c o sts. • Outd a te d c o lle c tio n syste m o f ne a rly 100% vitrifie d c la y pipe (VCP) surc ha rg e s in se ve ra l lo c a tio ns d uring he a vy ra ins. • Syste m la c ks c a pa c ity to c o nve y a ll we t we a the r flo w to the ne wly e xpa nd e d WWT P. • L a st syste m surve y wa s ne a rly 30 ye a rs a g o .

Purpo se Goals Re mo ve a s muc h I/ I fro m the syste m a s po ssib le witho ut • e xha usting a ll re so urc e s E limina te b a se me nt flo o d ing / o ve rflo ws / future • c o mplia nc e po ssib ilitie s Id e ntify b o ttle ne c ks a nd o the r d e fic ie nc ie s in c o lle c tio n • syste m Upd a te syste m ma pping to re fle c t a c tua l fie ld c o nd itio ns • Ge t se wa g e to ne w WWT P • Pro je c t must b e a ffo rd a b le ! •

A c usto mize d a ppro a c h to me e t the City’ s ne e ds

Appro a c he s T r aditional Appr oac h Customize d Appr oac h • Id e ntify I/ I Re la te d Pro b le ms • Id e ntify I/ I Re la te d Pro b le ms Re g io na l F lo w Mo nito ring / Re g io na l F lo w Mo nito ring / • • Ba sin Se le c tio n Ba sin Se le c tio n  F • De ta ile d SSE S oc use d SSE S  Mic romonitoring Re me d ia tio n • Re c o mme nd a tio ns  CCT V  Smoke and dye te sting and othe r SSE S ac tivitie s as ne e de d Re me d ia tio n • Re c o mme nd a tio ns

Ste p 1 Re gional F low Monitor ing Divid e d the syste m into 11 d istinc t se we r b a sins • De te rmine d 3 b a sins re q uire d no furthe r inve stig a tio n •

Ste p 2 Mic r omonitor ing Initia te d in the b a sins whic h re g io na l flo w mo nito ring / City • sta ff c o nsulta tio ns d e te rmine d we re wo rst c o ntrib uto rs o f I/ I 67 site s mo nito re d in 3 mo nths (10-15 a c tua l MM’ s w/ 2 sta ff) • Of the 132,043’ o f se we r mo nito re d : • 19,047’ o f se we r iso la te d a s e xc e ssive I/ I so urc e s • 26,706’ iso la te d a s mo d e ra te I/ I so urc e s • De ta ile d SSE S wo rk will b e fo c use d in the se a re a s • (19,047+26,706) / 132,043 = 35% “T he e ar ly payoff for the City is not in the se we r s found to c ontr ibute e xc e ssive I/ I, but r athe r in the se we r s that do not c ontr ibute e xc e ssive I/ I that ar e e liminate d fr om c onside r ation for additional SSES wor k”

Ste p 3 Close d Cir c uit T e le vision (CCT V) Inspe c tion • Co mple te d in two ro unds within se we rs fo und to c o ntrib ute e xc e ssive o r mo de ra te I/ I A va rie ty o f de fe c ts disc o ve re d • Struc tura l • I/ I •

Hole in Pipe

Hamme r T ap

F r ac tur e d Pipe & Hamme r T ap

De posits w/ Infiltr ation

Infiltr ation Runne r

Infiltr ation Gushe r

Root Intr usion

Utility line bor e d thr ough se we r

Hole w/ soil pour ing in

Ana lysis Syste m Analysis • Ana lysis inc lude d o the r typic a l I/ I inve stig a tio n wo rk: • Syste m ma pping a nd ve rific a tio n L ift sta tio n run time a na lysis • • Co mpa riso n o f wa te r use re c o rds with flo w mo nito ring a nd mic ro mo nito ring da ta • Inte rvie ws with City sta ff to g a in histo ric a l kno wle dg e o f pro b le m a re a s Info use d in c o njunc tio n with fie ld wo rk to fo rmula te • va rio us re me dia tio n re c o mme nda tio ns

Pre limina ry Re sults SSE S Re por t • Dra ft F o c use d SSE S re po rt pre se nte d to City in No ve mb e r 2013 c o nta ine d: • F lo w mo nito ring re sults • Mic ro mo nito ring re sults CCT V Ro und 1 re sults • • Additio na l o b se rva tio ns Re ha b ilita tio n re c o mme nda tio ns • • Re c o mme nda tio ns fo r fo c use d SSE S wo rk in spe c ific a re a s b a se d o n mic ro mo nito ring da ta Pro je c t fina nc ing re c o mme nda tio ns • • Re po rt wa s upda te d a s SSE S inve stig a tio ns c o ntinue d

Da ta Ana lysis Inflow vs. Infiltr ation Inflo w Mic r omonitor ing data analysis c an be use d to dir e c t spe c ific foc use d SSES wor k