post point wastewater treatment plant improvements

Post Point Wastewater Treatment Plant Improvements

Project Overview

October 2010

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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

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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

Chemical Storage and Metering

• 2,600 sf Building• PAX, Polymer Storage• Electrical Room

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PEPSModifications

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

Modifications to Existing Activated Sludge Basins

Remove SurfaceMixers

Aeration Piping

Reroute Large ML Process Piping

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Flow Splitter Box

Secondary Clarifier

Secondary Clarifier Improvements

Pile Supports

Piping Connections

Addition to Splitter Box

RAS System Modifications

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Additional Basin(future)

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

. 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