ansonia engineering report

7/30/2019 Ansonia Engineering Report

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ANSONIA-DERBY INTERCONNECTORPreliminary Analysis

A. Ansonia-Derby InterconnectorAs shown on the attached map, the following three alternative routes were analyzed forrouting the interconnector. Each route connects the ef{luent from the Influent PumpStation of the Derby V/ater Pollution Control Facility (V/PCF) to the wet well of theInfluent Pump Station at the Ansonia \I"PCF. 'Ihe proposed routes of the serverinterconnector are presented as follows:

Option #l: The route for Option #1 proceeds &orn the Derby W?CF Influent Punpnortho crossing unclemeaih the existing railroad immediately north of the WPCF,continuing north along the east side of Caroline St., crossing under Main St., thencontinuing norlh along Caroline St. until turning northeast at Cottage St. From thispoint, the route continues through a vegetated area untii reaching Route B, rvhere itwill cross under this road, then continue norlheast along the west side of PershingDr. until r'eaehing the Ansonia llv?CF, r,''here it will turn east, crossing underPershing Dr. and then under another railroad, and conlinuing to the ilfluent *'etwell for Aasonia WWTP. The route will take the sewer through severalcommercial/industrial areas with paved parking areas. The sewer is to be iS-inchreinforced concrete pipe (RCP) with an approximate length of 8,000 linear feet(LF).Option #2: The rsute for Opticn #2 proeeeds from the Derby WPCF Influent Pumpeast, crossing under Route 8, then continuing east uritil turning north approximately550 feet east of the WPCF. The route crosses under an existing railroad, contiluingncrth through a vegetated area, crossing under Main St. east of the intersection withRoute 8, then conlinues north, following an existing railroad, crossing underneathDivision St., continuing to the Ansonia W"CF, This se:*er route will pass throughseveral commereiallindustrial areas with par,ed parking lots, and may require right-of-way acaess ficm fhe or*'ner of the existing railroad. The se*'er is to be i5-inehRCP with an approxirxate length of 8,000 LF.Option #3: The route for Option #3 proceeds east from the Derby WPCF InfluentPump, crossing under Route 8, continuing east approximateiy 800 feet until turningnorth. The route crosses under an existing milroad, proceeds north crossing underMain St. west of the intersection with Derby Ave., then continues nonh follorvingthe Derby Greenway to Division St.. crosses under Division St." then proeeedsalong N. Division St. until turning west into Ansonia WPCF. This route takes thesewer through predominately vegetated area until reaching the Divisicn St.crossing, then the route encounters an industrial area west of N. Division St" Thesewer is to be 1 5-inch RCP installed at an approximate length of 8,500 LF.

Parametric Constructicn Cosf EstirnatesOption #l: The preliminary cost estimate for Option #1. including materials, labor,and contingencies is $8,900,000.Option #2: The prelimilary cost estimate for Option #2, including materials, labor,and contingencies is $7.300,000.Option #3: The preliminary cost estimale for Option #3, including materials, labor,and contingencies is $5,700,000-


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B. Water Pollution Control Facilify (WPCF) Flow Data AnalysisThe influent flor,r.s to l)erby and Ansonia WPCFs rvere provided for the time periodJanuary ?009 to February 201 1. The monthly average flows from the limited data wereanalyzed and are presented as fsllows:Derby WPCF - design flow capacity 3.5 MGD, peak flow capacify 9.1 MGD*Year20092010201 I

Year200920 l0201 l

2.213.012.91

6.4i8.085.30

Average Daily Flow' (MGD) Maxirnum Daily Fiow {MGD)

*Data taken from Faoilities Pianning Study, 1997.ln the analysis period, the 1VPCF exceeded its peak flow capacity 5 times, July ?009,February 2010, March 20i0, April 2010" and October ?010. reaching a high peak flou'of 10 MGD for the three months February to April 2010. The plant exceeded its designflorr capacity 4 times. Februarv ?010, March 2010, April 2010, and F'ebruary 201 1.Ansonia WPCF - design flow capacity 3.5 MGD, peak flow capacit-v 7.0 MGD

Average Daily Fiow (MCD) Maximum Daily Flow (MGD)5.085.733.50

1.722.251.80

In the analysis period, the WPCF exceeded its peak flow capacity 4 times, June 2009,July 2009, ]v{arch ?010, and April 2010. The plant exceeded its design {low capacity inMarch 2010.C. lnfilfratian/Inflow (I/I)

A comparison was made belween the peak flows to Derby WPCF and historical rainfalldata for the same period to see if a correlation could be established between high peakflows and above normal rainfal] eyents. This correlation rvould be useful indetermining if infiltrationjinflow into Dertry's u'aste*,ater sewers is eontributing to highpeak flows to the plant. For lhe months analyzed where the plant's peak florv capacitiesr.vere exceeded, rainfall records shorv that for June and July 2009, aad March 2010, therainfail totals exceeded the arca averages by over 509/o. The high minfull amountsmight indicate that high I/I rates were a contribuling factor in the plant's peak capacifybeing overtaxed. Table 1 provides the average WPCF plant inflow data and rainfallamounts for Derby.An Ir'I sfudy produced for &e City of Derby inZAAT shorred that I/I volumes into thesanitary sewer system can be as high as 1.4 MGD. Reducing 60% of the I/l into thesystem s'ould resu! b average daily flows approaching 1.2 MGD and peak flowsnearing 3.2 MGD. lt is our understandilg that the City of Derby is currentlyconducting an I/I study of the sanitary sewer systern. Once the results of that study arepublished, the correlations between sanitary florvs and rainfall events can then bereevaluated and more accurats measurements of average and peak flows can beobtained.


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D.

The same comparison rvas performed for the Ansonia WPCF and found that highrainfall arnounts and runoff during the months lhe plant exceeded its design and peakflow capaciry could have been a contributing factor. However, the incidents ofexceeding the plant's capacities are fewer, srrggesting thal lll through the Ansoniaserver system may be less prevalent. Table 2 provides the average plant inflow data andrainfall amounts for Ansonia.A program that actively targets I/l reduction would reduce the florvs from Derbrv to theAnsonia W.PCF to voiurnes that might allorv the Ansoaia WPCF to safely treat Derby'swaste',rrater without requiring an upgrade in plant capacitr at Ansonia.Con clusions/Recom mendstionsThe above flow data from the two WPCFs indicates that, if the flow from Derby istaken to Ansonia, the combined flow for 180 consecutive days will exceed 90% of thepresent ayerage design flow rate of Ansonia WPCF. This will trigger a requirement forthe Ansonia W?Cfr as stated below:

Section 4(L) of Ansonia WFCF's NPDES Permit issued on lane27,2001states:When the arithmetie nzean of the sverage dailj, Jlow fram the POTW Jbr thepreviaus 180 days exeeeds 90% of the design jla** rate, tke permittee slealldet'elop and submit for lfze review of lhe Connnissianer rqitllin one ),eqr, a planto qccommodatefuture incresses inflow to the planr. This plan shall include aschedule for completing any recammended imptovewents and a plan forfn anc ing the imprav e m e nts.

Without an active program to reduce the III conkibuting to the Derby sanitary sewersystefir, the combined present :lverage daily flows from Derby and Ansonia couldexceed rhe current average daily heatment capacig of 3.5 MGD for the AnsoniaWPCF. This *'ould result in the City of Ansonia exceeding its NPDES Permit 1i-eirsand require plans fur future upgrades of the WPCF to be submitted.lf an active progrcm to reduce the I{ though the Derby sewsr system is completed, theaverage flows can be reduced by as much as 607o, bringing the total flows through theproposed sewer interconnect within the design and peak flow capacities at AnsoniaWPCF.


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E. List of Referencesl. Influent and Effluent Qualitative Data Sheets, January 20S9 through February 2011,Derby WPCF, City of Derby, Conn.2. Sanitary Sewer System Infilrratian/Inflow Analysis, Haytthorne Avenue Watershed.Milone & MacBroom. Lnc., MMI +t2165-01-12, July 2007.3. Facilities Plan, Wastew*ter Tratffient Plsnt and. Sanitary Eewerage S1xtern. Cig ofDerby, Connecticut Water Pollution Confrol Authoriry*, Semi-Final Drafi. CascioBechir Engineers. July' i997.4- Construction Plans. Ci*, af Derby, AJterqtions and Additians to th,e Wafer PallutionControl P[ant Pump Statians and Sanitary Sewerage System. Cascio Bechir Engireers.August, 1998.5. Influent and Effluent Qualitative Data Sheets, January 2009 through April 2011,Ansonia WPCF, City of Ansonia, Conn.6. I;acilities Planning Study, Cily of Ansonia, Connecticut Water Pollution Control

Authority. United International Corporation. Jul;r 20S4"7. Seuter System Evslusti{}n Sarve!, Pkase I stzd Ph#se -II City of Ansonia, ConnecticutWater Pollution Control Authoritl. United Intemational Corporation. June 2000.8. Infiltration/Infiov, Study. Cif of Ansonia, Connecticut Water Follution ControlAuthority. United Intemational Corporation. September 1 996.9. Consfruction Plans. C/ry of Ansania, Connecticut, Water Pollutian Control FacilityUpgrode. Camp, Drssser &McKee, Inc. November 7A07.


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TRIC CONSTRUCTION COST ESTIMATE

Phasa:

ProjectlPreliminary

Derby-A nsonia Sewer lntereonnectAnsonia, Conn,

Date: May 27,2011Prepared by: Prime Engineedng & Architecture, lnc"3000 Corporate Exchange Dr.

Columbus, Ohio 43231

PRIME Project No. C1100242EOption #1

er Pipe Unit Unit Cost 5LF 38.5LF 23,5{Y 6.25cY 17.25

Quantity Amount8,000 $ 388,080.008,000 $ 234,880.0011,000 $ 86,625-0011,00c $ 15s-925,00$ 867.510.00

Ls-inch RCP Piperenctrlng, 4' wide

ll, Gravel,4'widefill, Satis{actory Fill, 4' wide

Sub Total, Sewer PipeWork

avement Removal and Replacementoadway Crossing, Jack & Bore

SYLFLF

AcreIqLSLSICI(

424525

?,200L00,000100,000100,00050,000100,000

24,000400200

-L1111

$$s$$oo$$c

2,268,000.0021 1,680.00132.330,00

1,386.00100,000.001 00,00c.001 00,000.00

50,000.00100,000.00

3,063,366.00

315,000.002,520,000.002,835,000.00

6,765,876.00

1,014,881.40338,293.80

1,353,1 75.20

676,587.6050,oao.00

ilway Crossing, Jack & Boreegetated Areas, Replacement, Seeding & Soddingtifity Relocationsement, ROW Acquisition

raffic Controlemporary fencing, signage, traiters

itionSub Total, Site Work

umping Equipmentrimary Purnp, Derby WPCF, 30Hp @ 70 ft of headackaged Lift Station ea

125.0001,000,000

e5$ub Total. Pumping Equipment

Sub Total, Materials, Equipment, and Site WorkContingency @ 15% $a

$Cantingency @ 5%

sub Total, Contingencyal Requirements @ 10% of Construction Cost

Qits {EPA, State, local) 50,000otal lstimated Frobable Construction Costs s 8,845,638.80

sAY 58,900,000costs are extrapolated from RS Means 2010 cost data and adjusted for 201L costs by 5%.


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PARAMETRIC CONSTRUCTION COST ESTIMATEPhase:

Project:Preliminary

Derby-Ansonia Sewer lnterconnectAnsonia, Conn.

Date: May 77,201LPrepared by: Prime Engineering & Archilecture, lnc.3000 Corporate Exchange Dr.

Columbus. Ohio 43231

PRIME Project No. Cl1002-02EOption #2

Pipe Unit Unit Cost $LF 38.5LF 23.5cY 6.25cY L3..25Quantity Amount8,000 $ 388,080.008,000 $ 236,880.0011.000 $ 86,625.0011,000 $ 155,925.00$ 867,510.00

3.5-inch RCP Pipeg,4'widell, Gravel,4'wide

kfill, Satisfactory Fill, 4' wideSub Total, Sewer Pipe

Site Workavement Removal and Replacement 5Y

LFItrAcre

L5LSLSL5LS

7542A525

2,200100,000100,000100,00050,000100,000

11,200 $300 I200 $0.7 $l.$1$1$1$L$s

1,058,400.00158,760.00132,300.00

1,940.40100,000.00100,000.001 00,000.0050,000.00

1 00,000.001,801,400.40

31 5,000.002,520,000.002,835,000.00

5,503,910.40

825,586.5627 s,195.52

1,100,782.08

550,391.0450,000.00

Roadway Crossing, Jack & EoreRailway Crossing, Jack & Bore

Areas, Replacement, Seeding & SoddingUtility RelocationEasement, ROW AcquisitionTraffic Controlemporary fencing, signage, trailers

DemolitionSub Total, Site Work

Pumping EquipmentPrimary Pump, Derby WPCF, 30Hp @ 70 ft of head eaea

125,0001,000,000 $

$ackaged Lift Station

Sub Total, Pumping EquipmentSub Total, Materials, Equipment, and Site Work

Contingencv @ 15% $$$

Contingency @ 5%Sub Total. Contingency

al Requirements @ 107o of Construction Cost $$FPA,State, local) LS 50,000

btal Estimated Probable Construction Costs $ 7,205,083.52sAY 57,300,000nit costs are extrapolated from RS Means 2010 cost daia and adjusted for 2011 costs by 5%.


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PARAMETRIC CONSTRUCTION COST ESTIMATEPhase:

Project:Preliminary

Derby-Ansonia Sewer lnterconnectAnsonia, Conn.

PRIME Project No. C11002-02E

Prepared by: Prime Engineering & Architecture, lnc.3000 Corporate Exchaoge Dr.Columbus, Ohio 43231

Date: May 27,2071

Option #3Sewer Pipe1"5-inch RCP PipeTrenching. 4' wideBacHill, Gravel, 4' wideBackfi ll, Satisfactory Fill, 4' wide

Sub Total, Sewer PipeSite WorkPavement Removal and ReplacementRoadway Crossing, lack & BoreRailway Crossing, Jack & BoreVegetated Areas, Replacement. Seeding & SoddingUtility RelocationFasement, ROW AcquisitionTraffic Controlemporary fencing, signage, trailers

DemolitionSub Total, Site Work

Pumping EquipmentPrimary Pump, Derby WPCF, 30Hp @ 70 ft of headPackaged Lift Station

SYLFLF

AcreLSL5LSlcL5

Unit Unit Cost SLF 27LF 23.5cY 6.2scY 1L.75

Quantity Amount8,500 $ 28e,170.008,500 $ 251,685.0012,500 $ e8,437.5012,500 $ 177,187.50$ 816,480.00$ 37,800.00$ 158,760.00$ 65,150.00$ 5,544.00$ 100,000.00$ 100,000.00$ 100,000.00$ s0,000.00$ 50,000.00$ m8,254.00$ 315,000.00

2,520,000.002,835,000.00

4,319,734.00

647,960.10215,986.70863,946.80

431,973.4050,000.00

$

$

$ 5,665,654.20sAY s5,700,000

75470525

2,240100,000100,000100,000s0,00050,000

125.000r.,000,000

400300100

2t111t

eaea

Sub Total, Pumping EquipmentSub Total, Materials, Equipment, and Site Work

Design Contingency @ 15%struction Contingency @ 5%Sub Total. Contingency

neral Requlrements @ 10% of Construction CostPerrnits {EPA, state, local) 50,000

otal Estimated Probable Construction Costs

Unit costs are extrapolated from RS Means 2010 cost data and adjusted for 2011 costs by 5%.


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'ffi{W1ffiIry OF ANSONIA

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ansonia engineering report

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