post point wastewater treatment plant improvements
TRANSCRIPT
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Post Point Wastewater Treatment Plant Improvements
Project Overview
October 2010
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Post Point WWTP Project Site
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Projected BOD Loading
20,000
25,000
30,000
35,000
40,000
45,000
1998 2003 2008 2013 2018 2023 2028 2033 2038
Plan
t Influen
t BOD Lo
ad (lb/d)
Comp PlanReduced GrowthReduced Growth+Aggressive ReductionHistorical Max 30‐Day Avg
Estimated Phase 1Completion (Year 2014)
Current WWTPCapacity
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Average Monthly BOD Loading
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
J M M J S N J M M J S N J M M J S N J M M J S N J M M J S
% of R
ated
Cap
acity
2006 2007 2008 2009 2010
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Average Monthly Flow1998-2010
0
2
4
6
8
10
12
14
16
18
20
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average Mon
thly Plant Flow (m
gd)
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Basis of DesignParameter Current NPDES
PermitDesign
Design Year --- 2034
Design FlowAverage AnnualMaximum MonthPeak Hour (plant)Blending allowed for peak flowPeak Hour (secondary)
---20 mgd72 mgd
Yes37 mgd
21.7 mgd34.3 mgd72 mgd
Yes40 mgd
Maximum Month Influent BOD 25,530 lb/d 39,800 lb/d
Maximum Month Influent TSS 47,000 lb/d 47,000 lb/d
Temperature Range --- 12-22.5 oC
Effluent BOD 30 mg/L 30 mg/L
Effluent TSS 30 mg/L 30 mg/L
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Wetlands
NeighborhoodImpacts
InterpretiveTrail Loop/Public Access
Open Space(passive recreation)
Wildlife Habitat
Poor Soils
BellinghamBay
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CEPT Building
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Chemically Enhanced Primary Treatment (CEPT) Building
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Chemical Storage and Metering
• 2,600 sf Building• PAX, Polymer Storage• Electrical Room
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PEPSModifications
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Modifications to Primary Effluent Pump Station
Structural Addition
Pump Replacement and Electrical Modifications
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BlowerBuilding
Selector/ AS Basin
Modificationsto Existing ABs
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Selector/Activated Sludge Basin 1
Aluminum Covers
Sluice Gates
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Blower Building
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Oxygen Supply and Standby Power
• 5,800 sf Building• Blower Room• Generator Room• Controls Room• Electrical Room
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Modifications to Existing Activated Sludge Basins
Remove SurfaceMixers
Aeration Piping
Reroute Large ML Process Piping
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Flow Splitter Box
Secondary Clarifier
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Secondary Clarifier Improvements
Pile Supports
Piping Connections
Addition to Splitter Box
RAS System Modifications
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Additional Basin(future)
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Additional Activated Sludge Basin(Likely Future Phase)
Flow Junction Box
0.84 MgalAeration Basin
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Secondary Clarifier
Selector/ AS Basin
BlowerBuilding
CEPT Building
PEPSModifications
Flow Splitter Box
Additional Basin(future)
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Yard Piping Layout
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Piping Between PEPS and Selector/AS Basin 1
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Secondary Clarifier Piping
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. 2008 2009 2010 2011 2012 2013 2014
PlanningPreliminary Design Detailed DesignConstructionStartup
Complete construction
Project Schedule
Notification of Selected GC/CM
Complete MACC Negotiations
Begin Pre-Construction
Phase
Begin Construction