West Acton Sewer Extension Project: Feasibility Study &CURRAN Acton Water Resources Advisory Committee Meeting March 12,2008 COMMITMENT & INTEGRrrY DRIVE RESULTS Wes Acton Sewer Extenslo Proect Why West Acton? Two areas identified in 2004 CWRMP as WOODARD &cuRRAN Needs areas requiring off-site wastewater solutions Area 10: Spencer/Tuttle/Flint Area 12: West Acton Center Goal of Study Understand critical aspects of the project evaluation Understand order of magnitude costs Codify consensus with the To’iIn and AWRAC COMMITMENT & INTEGRITY DRIVE RESULTS
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
West Acton SewerExtension Project:Feasibility Study
&CURRAN
Acton Water Resources AdvisoryCommittee Meeting
March 12,2008
COMMITMENT & INTEGRrrY DRIVE RESULTS
Wes Acton SewerExtenslo Proect
Why West Acton?Two areas identified in 2004 CWRMP as
WOODARD&cuRRAN Needs areas requiring off-site
wastewater solutionsArea 10: Spencer/Tuttle/FlintArea 12: West Acton Center
Goal of StudyUnderstand critical aspects of the project evaluationUnderstand order of magnitude costsCodify consensus with the To’iIn and AWRAC
COMMITMENT & INTEGRITY DRIVE RESULTS
West Acton
- L :
W000ARD&CURRAN
.11nn
Y.Prty Ca.a.d 0th.S
7-1o- — - YConn.ct,dt0th.S...i,
— I0PmCeSS-( Cnnectld. 2
— Prcpeth.s A4ecrt to Lb. S,
• “
Current Sewer Connections21Z701to 4
• 678 parcels in sewer area
• 380 parcels connected (56%)• 1,841 SBUs in area• 1092 Connected (59%)
W000ARD&CURRAN
WOODARD&CURRAN
Available Wastewater Capacity;
WWTF Effluent Capacity = 299,000 gpdCurrent Average Daily Flow = 115,000 gpdCapacity unallocated and
available = 49,000 gpd
Town of ton. MA10 Esthowt.d Flows vs Actual Flows
Compared with Nu,,ter of weakly Connections to th. Sew,r SOslem
max.
Capacity reserved for existingSOU not yet connected
110Am
299000
GPO
_______________________________
LIMTWa.kly Cormactiors Avshiab!. Capacity10 E,tfmat.d Flow, for Curre I Project
ActoxiFw ]
20
1)
S5
A
to
N00 Jac-00 42 F.b4t Jm-00 0o949 Feb-el n44 00.04 Fob-al Jow04 001-04 Fob-tI ho-04 0004 F.b.tY Jon? 0047 Jac41
Available Ca acityatWWTP Aomnni.w t
WOODARD&CURRAN
Sewer Layout Criteria
Areas defined in Scope of Work (excludingDouglas & Gates Schools)
Current Zoning limits — “West Acton VillageZoning” & “Village Residential”
Natural Topography — sewer depth/rivers
Available Capacity up to 49,000 gpd
(based upon actLlal winter water Lise)
WEST ACTON CENTER -EAST
WOODARD&CURRAN
WOODARD&CURRAN
Conceptual Design
15% Concept Design for AlternativesGeneral areas of benefit (subject to changed based
on site survey & detailed information)Rough sewer system layout
- Key design features (pump stations, river crossings)ipiclly ±15/ accuracy on concepts
Direct Costs: Construction CostCategories at Concept Level
8” PVC Sewer — varying depths6” PVC Service Stubs per structurePVC Low Pressure SewerPumping Stations
- Paving Trenches — Local & State roadsPaving Overlay — Local & State roadsWater main & drain pipe replacementLedge & Rock RemovalConstruction Contingency - 5% to 20%
WOODARD&CURRAN
AIfrWOODARD&CUR RAN
Indirect Cost Categories atConcept Level
Based on Construction CostsDesign & Permitting — 10%
Procurement & Construction Engineering — 1 5%
Administration (Police, Financing, Legal) — 1 0%
Contingency — 5%
tl aRdmFesPn€t-WA
bn,.b
-f. LF
PVC LF
-Td.rnLIe...u
Pr -Fiii• W
-0 P..dWAi.rIi.R.b, Il L.F
• , — •In
g• Dd
d -S bd
A CAL..
d
U—
WOODARD&CURRAN
WOODARD&CURRAN
Lessons Learned
Need to account for price escalations prior toconstruction (2 years in this case)
Include sufficient contingency
Concept Designs may change slightly asdesign details become available
Financial Models for Costs are key
- Betterments - Operation costs
- Working capital - Connection costs
Financial Impacts at thFeasibility Study level
Design & Construction CostsBased upon current construction climate
Capacity Allocation CostsGoverned by Acton Sewer Bylaw
Inflation/Escalation Costs
COI.iMITMENT & INTEGRITY DRIVE RESULTS
I
WOODARD&CURRAN
Financial Impacts at theFeasibility Study Level —
Sewer Betterments
Spencer I Tuttle I Flint&CURRAN S40k to $57k per SBU
West Acton CenterS36k to S61 k per SBU
Combined ProjectS38k to S59k per SBU
cpacyAIxatn
bt
COMMMENT NTEGRttY DRIVE RESULTS
COMMITMENT & INTEGRITY DRIVE RESULTS
WOODARD&CURRAN
WOODARD&CURRAN
Economy of Scale- If both areas are Combined
Reduced Indirect Costsg
Optimize Design
One Bid Cycle and Post Bid Review
Reduced mobilization an.i oversight costsduring Construction
Moving ForwardWest Acton jExten&on Project
Conceptual Schedule
Task Date
Feasibility! Design Basis April 2008
Preliminary Engineering July - Sept. 2008
Funding Applications August 2008
Special Town Meeting Fall 2008
Determining Funding Options January 2009
Approve Design & Construction Funds Spring ATM 2009
Detailed Design & Permitting July 2009- October 2009
SRF Submittal (if appropriate) October 2009
‘—. Advertise for Bid Winter 2010
Start Construction April 2010
Finish Construction December 2010
Start Connections January 2011
10
WOODARD&CURRAN Questions?
COMMITMENT & INTEGRITY DRIVE RESULTS
Related Documents
