No ve mbe r 15, 2017 T he Round Valle y Re se r voir Str uc tur e s Re fur bishme nt and Re sour c e Pr e se r vation Pr oje c t
OVE RVIE W T e am Intr oduc tion About the NJWSA About Round Valle y About the Pr oje c t Pr oje c t Compone nts - E mbankme nt Modific ations - Gr outing - Re gr ading - Dr e dging - T owe r Re pair s T ime line Public Impac ts T he Pr oje c t We bsite Q & A
T E AM INT RODUCT ION MARC BROOKS, P.E . Chie f E ngine e r SCOT T RASCHKE , P.E . Consulting E ngine e r NICOL E PACE - ADDE O, M.A. Public Outr e ac h Spe c ialist
ABOUT T HE NJWSA • Inde pe nde nt State Author ity, “in but not of” the Ne w Je r se y De par tme nt of E nvir onme ntal Pr ote c tion • Cr e ate d in 1981 to take ove r and ope r ate e xisting wate r supply fac ilitie s and imple me nt pr oje c ts ide ntifie d in the State Wate r Supply Plan • Ope r ate thr e e wate r supply syste ms: • Rar itan Basin Syste m (Spr uc e Run, Round Valle y, D&R Canal) • Manasquan Re se r voir Syste m • Manasquan Wate r T r e atme nt Plant & T r ansmission Syste m
ABOUT ROUND VAL L E Y • T hr e e e ar the n e mbankme nts c onstr uc te d in 1960s to c lose valle y and impound wate r • Capac ity is 55 billion gallons – lar ge st r e se r voir by volume in Dike & No r th Dam dur ing o r iginal c o nstr uc tio n Ne w Je r se y • Round Valle y wate r is r e le ase d into the Nor th Br anc h of the Roc kaway Cr e e k ne ar White house Station • T he se dams ar e r e gulate d by NJDE P Dam Safe ty Pr ogr am
ABOUT ROUND VAL L E Y • Par t of Rar itan Basin Syste m, de signe d to he lp maintain passing str e am flows on the Rar itan Rive r • Rar itan Basin Syste m pr ovide s 241 MGD in safe yie ld to e nsur e ade quate wate r supply and pr ote c tion against dr ought • T he safe yie ld is the amount of wate r that a r e se r voir syste m c an supply without fail dur ing the dr ought of r e c or d • Appr oximate ly 1.5 million pe ople in c e ntr al Ne w Je r se y r e ly on the Rar itan Basin Syste m
ABOUT ROUND VAL L E Y • “Off str e am pumpe d stor age ” – r e se r voir is fille d by 3.2- mile pipe line c onne c te d to the South Br anc h of the Rar itan Rive r • South Br anc h Pumping Station c ontains te n 40MGD pumps • In 2017, 7 billion gallons of wate r was pumpe d to the r e se r voir ove r about 6 months, r aising the wate r le ve l by about 10 fe e t • Pr ofe ssional staff ar e on site e ve r y day on the dams: mainte nanc e , instr ume ntation r e adings, se c ur ity • Dam inspe c tions ar e c onduc te d quar te r ly by e ngine e r ing staff • NJDE P State Par k Se r vic e ope r ate s r e c r e ational aspe c ts • NJDE P Division of F ish & Wildlife ope r ate s fish and game aspe c ts, boat launc h
ABOUT T HE PROJE CT – WHY? • Pr ote c t and maintain State asse t to e nsur e ade quate wate r supply and pr ote c tion against dr ought • Dams we r e built with an e stimate d ope r ating life of 50 - 100 ye ar s and it’s be e n almost 60 ye ar s; this is an inve stme nt in the State ’s futur e • De sign standar ds have c hange d sinc e the 1960s – we ar e r e tr ofitting the str uc tur e s with the late st e ngine e r ing appr oac he s to inc r e ase r e silie nc y and sustainability for long te r m wate r supply ne e ds So uth Dam dur ing o r iginal c o nstr uc tio n
ABOUT T HE PROJE CT • NJWSA c onve ne d a pane l of wor ld r e nowne d dam safe ty e xpe r ts to advise us on how be st to e xte nd the ope r ating life of the r e se r voir • Cost of pr oje c t will be financ e d thr ough r e ve nue ge ne r ate d by the sale of wate r – no tax mone y involve d • NJWSA pr oc ur e d two e ngine e r ing fir ms to de sign and ove r se e the pr oje c t • Sc hnabe l E ngine e r ing is E ngine e r of Re c or d
PROJE CT COMPONE NT S 3 E ar the n E mbankme nts / “Dams” • Dike • No rth Da m • So uth Da m (da ms a re the 3 rd a nd 4 th hig he st in NJ) “Anc illar y” Infr astr uc tur e • Se c urity Mo nito ring I mpro ve me nts • Cha nne l Dre dg ing • No rth & So uth “T o we r” Re pa irs So uth Dam • Othe r unde rg ro und c o ntro ls / fe a ture s
E ART HE N E MBANKME NT S No r th Dike Dam E ac h unique Me a sure s to a ddre ss inc lude a lte ra tio ns to e xisting e mb a nkme nts a nd the ir fo unda tio ns: 1. T he fo undatio ns b e lo w the e mb ankme nts (No rth Dam/So uth Dam) – GROUT ING So uth Dam 2. T he e mb ankme nts the mse lve s (all 3) – So uth E MBANKME NT Dam MODIF ICAT IONS
E ART HE N E MBANKME NT S
E MBANKME NT MODIF ICAT ION 1: GROUT ING (NORT H & SOUT H DAMS) Extension of Grout Curtains (North Dam/South Dam) Looking upstream Top of Dam Reservoir Level Dam Embankment Cutoff Trench Bedrock Grout Curtain
E MBANKME NT MODIF ICAT ION 1: GROUT ING Injection of cementitious grout into bedrock at dam abutments Grout fills cracks in the bedrock to reduce seepage
E MBANKME NT MODIF ICAT ION 1: GROUT ING – NORT H DAM Area of grouting
E MBANKME NT MODIF ICAT ION 1: GROUT ING – SOUT H DAM Area of grouting Area of grouting
E MBANKME NT MODIF ICAT ION 1: GROUT ING Drill Rig Drill Rig Grout Mixing Plant Examples of grouting construction activities at other facilities
E MBANKME NT MODIF ICAT ION 1: GROUT ING Examples of grouting construction activities at other facilities
E MBANKME NT MODIF ICAT ION 2: NE W CHIMNE Y/ T OE DRAIN AND RE GRADING (AL L DAMS) Current conditions (no chimney drain) Post-construction conditions, showing chimney drain and regrading
E MBANKME NT MODIF ICAT ION 2: NE W CHIMNE Y/ T OE DRAIN AND RE GRADING New Fill on DS Face “Chimney” Drain “Toe” Drain
Example of embankment modification at another facility E MB MODIF ICAT ION 2 – NE W CHIMNE Y DRAIN AND RE GRADING
E MBANKME NT MODIF ICAT ION 2: NE W CHIMNE Y/ T OE DRAIN AND RE GRADING Examples of chimney and toe drain installation at other facilities
DRE DGING Rendering of the confined disposal facility The South Dam inlet channel will be dredged to restore its original design capacity. Dredged material will be stored in a confined disposal facility in a restricted area adjacent to the reservoir.
DRE DGING: SOUT H DAM CHANNE L So uth Dam T o we r , whe r e the r e se r vo ir is fille d and c an be e mptie d
DRE DGING: SOUT H DAM CHANNE L Vie w o f the So uth Dam T o we r fr o m the inle t c hanne l Vie w o f the inle t c hanne l fr o m the So uth Dam T o we r
T OWE R RE PAIRS AND UNDE RGROUND CONT ROL S/ F E AT URE S No rth “T o we r” Re pa irs So uth “T o we r” Re pa irs Othe r unde rg ro und c o ntro ls / fe a ture s
CURRE NT T IME L INE • Se c ur ity Impr ove me nts – planne d for 2018 • Nor th & South Dam Gr outing – planne d for Summe r/ F all 2018 (4- 6 months) • Channe l Dr e dging – planne d for Summe r/ F all 2018 (10 months) • E mbankme nt Constr uc tion – e stimate d for Mar c h 2019 (1- 2 ye ar s)
PUBL IC IMPACT S: ROADS • T r uc k tr affic on loc al r oads will be e xte nsive • 660,000 to 850,000 c ubic yar ds of mate r ial will be br ought onsite by tr uc k (one dump tr uc k c ar r ie s 10 – 14 c y of mate r ial) • A se c tion of Route 629 (ove r the Dike ) will be c lose d at time s dur ing the pr oje c t • T ime line and othe r de tails will be announc e d via our e mail list and we bsite
PUBL IC IMPACT S: ROAD CL OSURE & T RUCK ROUT E S T ruc king route from Route 22 (no roa d c losure ) Ope n a c c e ss to boa t la unc he s & fish la b (no roa d c losure ) Roa d c losure a re a for se g me nts of the proje c t
PUBL IC IMPACT S: WAT E R L E VE L • We will ke e p the Division of F ish & Wildlife informe d a bout a ntic ipa te d wa te r le ve l c ha ng e s a nd the y will try to a c c ommoda te boa te rs • Ba se d on c onstruc tion ne e ds, the le ve l of the re se r voir is not e xpe c te d to g o be low 25’ from full pool e le va tion (c ompa ra ble to 2016 summe r c onditions) • Droug ht ma y re duc e the wa te r le ve l due to wa te r usa g e – this is impossible to pre dic t • Informa tion a bout wa te r le ve l de c isions, inc luding timing , will be a nnounc e d via our e ma il list a nd we bsite
PUBL IC IMPACT S: RE CRE AT ION ARE A • Cushe tunk (re d) tra il – a sma ll a re a ne a r the South Da m will like ly be re - route d for sa fe ty • Short te rm tra il c losur e s ma y be ne c e ssa ry for sa fe ty • Cha ng e s to the tra il will be c oordina te d with the Sta te Pa rk Se rvic e a nd poste d on our we bsite • Sta g ing a re a s loc a te d ne a r the Re c re a tion a re a ma y be visible but a re not e xpe c te d to a ffe c t the public ’s use of the Re c re a tion a re a
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