Glendive Public Meeting Presentation - Copy

City of GlendiveWastewater System Improvements

Public MeetingPublic MeetingApril 26, 2011

April 2011

Presented by:

Craig Pozega, PEGreat West Engineering, Inc.

Why Are We Here?

City has identified wastewater system needs

Wastewater System Preliminary Engineering Report

PUBLIC COMMENT

Preliminary Engineering Report

What is a Preliminary Engineering Report (PER)Problem DefinitionDescribes existing systemEvaluate Alternatives including Selection of a Preferred

AlternativeEstablishes Costs and Potential Funding ScenariosEstablishes Costs and Potential Funding ScenariosImplementation ScheduleRequired by Funding Agencies to qualify for GrantsPUBLIC COMMENT

Problem Definition

Montana Pollutant Discharge Elimination System (MPDES) PermitMust have a MPDES permit to discharge wastewaterThe City of Glendive was issued a new MPDES Permit

in December 2007Permit contains many new monitoring, reporting and Permit contains many new monitoring, reporting and

recording requirementsCompliance schedule to meet future permit limits

Problem Definition

Water QualitySecondary StandardsAmmoniaNutrientsWhole Effluent Toxicity (WET)

Wastewater DisinfectionCurrently no disinfection of discharged effluent

Exposed BiosolidsVector Attraction

Planning Area

Evaluation of Existing System

2010 PopulationGlendive 4,935 people

Projected Population (2030)Glendive 5,000 peopleWest Glendive 2,226 peopleWest Glendive 2,226 peopleAnnexation Areas 743 peopleTotal With West Glendive 7,969 peopleTotal Without West Glendive 5,743 people


Existing and Design FlowsDesign Flow with West Glendive 1,100,000 gpdDesign Flow without West Glendive 800,000 gpd


The Collection System comprised of 22 miles of pipe, manholes, and 5 lift stations

The Wastewater Treatment Facility (WWTF) consists of a three-cell facultative lagoon system with discharge to Glendive Creek

Collection system installed between 1906 and 2007 - Mostly before 1930

Lagoons originally constructed in 1959-1960Upgraded in 1976 and 1996


Facultative Lagoon3 cells (21.1, 24.1 & 25 acres)Aeration transfer structuresDischarge to Glendive CreekNo effluent disinfection


Identified DeficienciesExisting Treatment can not meet some existing and

future permit limitsCollection (Minor)

Gravity sewer lines have some O&M issues such as slow flow, root problems, and flat slopesflow, root problems, and flat slopes

Lift Stations (Minor) Backup power to two lift stations, SCADA system to tie all

together, possibly new pumps at Husky

Collection and lift stations are minor deficiencies compared to the treatment deficiencies

Alternative Screening Process

Wastewater Treatment AlternativesMechanically Aerated Lagoons with Storage and

IrrigationBiological Nutrient Removal (BNR) Package

Mechanical Treatment PlantSequencing Batch Reactor (SBR) Mechanical Sequencing Batch Reactor (SBR) Mechanical

Treatment PlantLagoon/Moving Bed Biofilm Reactor (Lagoon/MBBR)

Storage & Irrigation

250-350 acres required for irrigation

Storage & Irrigation Advantages & Disadvantages

Avoids ammonia toxicity & WET issuesAvoids nutrient & TMDL issuesCurrently no discharge permit requiredFuture regulatory permitting?Limited expansion capabilityWater rights (New Legislation)Large land area required

New SBR/BNR Site Location

BNR Site Layout

BNR Plant

SBR Site Layout

SBR Plant

SBR/BNR Plant

Advantages & DisadvantagesChange point of discharge to Yellowstone RiverMeets ammonia toxicity & WET permit limitsProvides greatest treatment of all alternativesPending nutrient & TMDLCan be upgradedCan be upgraded

Lagoon/MBBR Site Plan

Lagoon/MBBR Reactor Layout

Lagoon/MBBR Hybrid

Advantages & DisadvantagesChange point of discharge to Yellowstone RiverMeets ammonia toxicity & WET permit limitsProvides greater treatment than existing lagoonsPending nutrient & TMDLEasy to operateEasy to operateCan be upgraded into IFAS system to meet future

regulations but expensive

Preliminary Cost Estimates

Table 8.4.3Preferred Alternatives

Present Worth Analysis

ITEM

ALTERNATIVE T-1 Mechanically

Aerated Lagoons with Storage and

Irrigation

ALTERNATIVE T-2 Biological Nutrient

Removal (BNR) Mechanical

Treatment Plant

ALTERNATIVE T-3 Sequencing Batch

Reactor (SBR) Mechanical

Treatment Plant

ALTERNATIVE T-4 Lagoon/Moving Bed

Biofilm Reactor (Lagoon/MBBR)

Capital Costs $9,569,000 $8,836,000 $7,200,000 $6,007,000

Annual O&M Costs $231,700 $278,800 $275,100 $200,500

20-Year Salvage Value $413,000 $1,130,000 $853,000 $200,000

Present Worth of Salvage Value $128,800 $352,300 $266,000 $62,400

Present Worth of Annual O&M Cost $72,200 $86,900 $85,800 $62,500

Present Worth Cost1 $9,512,400 $8,570,600 $7,019,800 $6,007,100

1Present worth based upon a 20 year life cycle using calculated discount rate.

Criteria Used to Rank Alternatives

1. Technical Feasibility

2. Environmental Impacts

3. Life Cycle Cost

4. Public Health and Safety4. Public Health and Safety

5. Operational and Maintenance

6. Public Opinion

Selection of Preferred Alternative

Table 8.5Table 8.5Table 8.5Table 8.5

Decision MatrixDecision MatrixDecision MatrixDecision Matrix

AlternativeAlternativeAlternativeAlternative

Technical Technical Technical Technical

FeasibilityFeasibilityFeasibilityFeasibility

Environmental Environmental Environmental Environmental

ImpactsImpactsImpactsImpacts

Life Cycle Life Cycle Life Cycle Life Cycle

CostCostCostCost

Public Health Public Health Public Health Public Health

and Safetyand Safetyand Safetyand Safety

Operation and Operation and Operation and Operation and

MaintenanceMaintenanceMaintenanceMaintenancePublic OpinionPublic OpinionPublic OpinionPublic Opinion

TOTAL TOTAL TOTAL TOTAL

Weight:Weight:Weight:Weight:8888






ScoreScoreScoreScore Wtd.Wtd.Wtd.Wtd. ScoreScoreScoreScore Wtd.Wtd.Wtd.Wtd. ScoreScoreScoreScore WtdWtdWtdWtd.... ScoreScoreScoreScore Wtd.Wtd.Wtd.Wtd. ScoreScoreScoreScore WtdWtdWtdWtd.... ScoreScoreScoreScore WtdWtdWtdWtd....

Storage & 6.0 48 8.0 40 2.1 21 6.0 36 7.0 70 0 215215215215

Storage &

Irrigation6.0 48 8.0 40 2.1 21 6.0 36 7.0 70 0 215215215215

BNR Plant 8.0 64 7.0 35 4.0 40 7.0 42 6.0 60 0 241241241241

SBR Plant 8.0 64 7.0 35 5.7 57 7.0 42 5.0 50 0 248248248248

MBBR4.0 32 5.0 25 7.9 79 5.0 30 6.0 60 0 226226226226

It is important to note that the above scoring and weighting are subjective. Alternatives that score overall within 10 pts of each other may

essentially hold the same degree of preference.

Selection of Preferred Alternative

Draft Preferred Alternative for WWTP Mechanical Treatment Plant BNR or SBR Technology

SUBJECT TO CHANGE BASED ON PUBLIC INPUTSUBJECT TO CHANGE BASED ON PUBLIC INPUT Estimated Cost of Draft Preferred Alternative = $8,570,600 Annual Estimated Cost for O&M = $278,800

Project Funding Strategy

Target Rate Analysis for Department of Commerce Grant Eligibility

Median Household Income (MHI) = $30,943

Department of Commerce Target Rate Threshold

Water Systems = 1.4% of MHI

Sewer Systems = 0.9% of MHI

Combined Rate = 2.3% of MHI

(Combined Rate Applies to Communities Which Have Both Systems)

City of Glendive Target Rate = ($30,943)(2.3%)

= $711.69/year$59.31/month

Current Average Water Rate $32.97/month

Current Average Sewer Rate $12.21/month

Combined Rate $45.18/month

Low & Moderate Income Percent = 37.3%

Project Funding StrategyTable 10.1.2

City of GlendiveFunding Options for BNR Wastewater Treatment Facility

ITEM

SCENARIO #1 SCENARIO #2 SCENARIO #3TSEP, DNRC Grants w/o

City Reserves, w/ SRF Loan (3.75% / 20 yrs)

TSEP Grant w/o City Reserves & SRF Loan

(3.75% / 20 yrs)

No Grants w/o City Reserves & SRF Loan

(3.75% / 20 yrs)TOTAL PROJECT COST $8,893,000 $8,893,000 $8,893,000TSEP Grant $500,000 $500,000DNRC Grant $100,000Town Reserves $0 $0 $0TSEP Planning Grant $15,000 $15,000 $15,000DNRC Planning Grant $5,000 $5,000 $5,000SRF Loan (20 Years) $8,273,000 $8,373,000 $8,873,000SRF Loan (20 Years) $8,273,000 $8,373,000 $8,873,000

User Capital Cost/Month $18.33 $18.56 $19.66

Total Projected Annual O&M Costs $630,800 $630,800 $630,800

User O&M Cost/Month $14.49 $14.49 $14.49

Total Proposed Average Residential Sewer Cost/Month $32.82 $33.05 $34.15

Percent of Combined Target Rate 110.9% 111.3% 113.2%

Where to go from Here?

Public Comment on Draft PER

Final PER

Preliminary Design and Permitting Sept 2011

Submit Grant Applications April 2012 Submit Grant Applications April 2012

Advertise and Bid Project February 2014

Construction Project April November 2014

Comments

www.greatwesteng.comwww.greatwesteng.comwww.greatwesteng.comwww.greatwesteng.com

HELENA

PO Box 4817 2030 11th Avenue Helena, MT 59604

Phone 406.449.8627 Fax 406.449.8631

BOZEMAN

602 Ferguson Avenue Suite #1 Bozeman, MT 59718

Phone 406.587.0504 Fax 406.587.0541

BILLINGS

115 N. Broadway, Suite 500 Billings, MT 59101

Phone 406.652.5000 Fax 406.248.1363

Glendive Public Meeting Presentation - Copy

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