Post Point Wastewater Treatment Plant Improvements
Project Overview
October 2010
Filename.ppt
Post Point WWTP Project Site
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
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
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)
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
Filename.ppt
Wetlands
NeighborhoodImpacts
InterpretiveTrail Loop/Public Access
Open Space(passive recreation)
Wildlife Habitat
Poor Soils
BellinghamBay
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Filename.ppt
CEPT Building
Filename.ppt
Chemically Enhanced Primary Treatment (CEPT) Building
Chemical Storage and Metering
• 2,600 sf Building• PAX, Polymer Storage• Electrical Room
Filename.ppt
PEPSModifications
Modifications to Primary Effluent Pump Station
Structural Addition
Pump Replacement and Electrical Modifications
Filename.ppt
BlowerBuilding
Selector/ AS Basin
Modificationsto Existing ABs
Filename.ppt
Selector/Activated Sludge Basin 1
Aluminum Covers
Sluice Gates
Filename.ppt
Blower Building
Filename.ppt
Oxygen Supply and Standby Power
• 5,800 sf Building• Blower Room• Generator Room• Controls Room• Electrical Room
Modifications to Existing Activated Sludge Basins
Remove SurfaceMixers
Aeration Piping
Reroute Large ML Process Piping
Filename.ppt
Flow Splitter Box
Secondary Clarifier
Secondary Clarifier Improvements
Pile Supports
Piping Connections
Addition to Splitter Box
RAS System Modifications
Filename.ppt
Additional Basin(future)
Additional Activated Sludge Basin(Likely Future Phase)
Flow Junction Box
0.84 MgalAeration Basin
Filename.ppt
Secondary Clarifier
Selector/ AS Basin
BlowerBuilding
CEPT Building
PEPSModifications
Flow Splitter Box
Additional Basin(future)
Filename.ppt
Yard Piping Layout
Filename.ppt
Piping Between PEPS and Selector/AS Basin 1
Filename.ppt
Secondary Clarifier Piping
. 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