2008 facility plan update
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2008 Facility Plan Update. May 2008. Purpose. Comprehensive Plan through 2033 Builds on Past Work Adjust for Changing Conditions Identify Capacity, Compliance, and Rehabilitation needs Robert W. Hite Treatment Facility Biosolids Management Program Transmission System

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Purpose l.jpg

  • Comprehensive Plan through 2033

    • Builds on Past Work

    • Adjust for Changing Conditions

  • Identify Capacity, Compliance, and Rehabilitation needs

    • Robert W. Hite Treatment Facility

    • Biosolids Management Program

    • Transmission System

  • Develop Cost-Effective Capital Improvement Program

    • To meet Future (more stringent) Effluent Quality Requirements

    • Accommodate Growth

  • Renewal 2003 Wastewater Utility Plan

    • Denver Regional Council of Governments (DRCOG)

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Updates 2003 Facility Plan & 2002 Service Area Utility Plan, and 2007 Biosolids Study

Updates 2003 Wastewater Utility Plan

Includes PELs from Future Effluent Limits Study

Incorporates North Secondary Improvements (PAR 942)

Defines South Secondary Improvements (PAR 1085)

Updates 2007 Land Use Model

Updates Plant GPS-X and Hydraulic Models

Updates Transmission System InfoWorks Model

What’s Included in 2008 Update

Does not include IS/Support facilities

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South Secondary Improvements and 2007 Biosolids Study

  • Parallel Track

    • Ammonia Compliance Deadline December 31, 2014

South Secondary Predesign

Complete Predesign Mar 09

Develop Alternative Layouts and Costs

Technical Team Review

Define South Secondary Needs

Complete Facility Plan

Begin Facility Plan

Jan 08

Feb 07

Jun 07

Jul 07

Aug 07

Mar 08

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Metro District Service Area and 2007 Biosolids Study

615 square miles and includes

City and County of Denver and parts of

Adams, Arapahoe, and Jefferson counties

Six Drainage Basins

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Member Municipalities and Special Connectors and 2007 Biosolids Study

20 Member Municipalities and 25 Special Connectors

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Population and Employment Projections Adams

  • Projections based on:

    • Updated Member Municipality & Special Connector information

    • Current population, employment & boundary information from DRCOG

      • TAZ Data (Transportation Analysis Zones)

    • Buildout projections from the Land Use Model

  • Population – Increase 39% or 1.5% per year thru 2033

  • Employment – Increase 52% or 2.0% per year thru 2033

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Flow and Load Projections Adams

  • Unit Flow Factors

    • 85 gallons per capita per day

    • 17 gallons per day per employee

  • Developed Service Area Projections

  • Adjusted to Determine Primary Influent Flows and Loads

    • Exclusion of area tributary to a future Box Elder WWTP

    • Reduction in flow of 5 mgd for the Sand Creek Water Reclamation Facility

    • Additional loads, such as in-plant and hauled wastes

    • Increase in BOD loads from DIA

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Existing Robert W. Hite Treatment Facility Liquid Stream Capacity

  • Current max month rated capacity 220 mgd with EPC (~185 mgd Annual Average)

  • Capacity without EPC 161 mgd Annual Average (Secondary Treatment)

  • North and South Secondary Expansions required to meet capacity and regulatory requirements

  • RWHTF AAF capacity needs to be 210 mgd in 2033

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Existing Robert W. Hite Treatment Facility Solids Stream Capacity

  • Improvements to the digesters and high-solids centrifuges are planned during 2008-2013.

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Existing Transmission System Summary Capacity

219 miles of interceptors, 12 miles of force mains and 4 lift stations

Capacity evaluation based on:

Previous modeling from 2002 SAUP

Updated Land Use Model

Updates to existing InfoWorks Model

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Discharge Permit Requirements Anticipated to Change Capacityin Phases 4 and 5

Discharge Permit Requirements Anticipated to Change in Phase 2


Phase 4


Phase 5

Beyond 2023


Phase 2


Phase 3


Total ammonia, mg-N/L

Daily maximum

7-day average

30-day average






Discharge Permit Requirements Anticipated to Remain Unchanged Through Planning Period

Total nitrogen, mg-N/L

Phasing Assumption

Assumed Range





CBOD, mg/L


TSS, mg/L


Nitrates (plus nitrites), mg-N/L

Daily maximum

7-day average

30-day average



Total phosphorus, mg-P/L

Phasing Assumption

Assumed Range





Maximum chlorine residual, mg/L


pH range, standard units


Minimum dissolved oxygen, mg/L


Regulatory Assumptions

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Improvements and Project Implementation Capacity

Transmission System improvements driven by rehabilitation needs and capacity constraints due to growth

RWHTF improvements phased over planning period to meet capacity, regulatory, and rehabilitation needs

Used recently developed Metro District Cost Estimating Guide for consistent and better cost estimates

Recommended improvements “packaged,” according to type, location, and timing

Construction Efficiencies

Save Capital Costs

Goal of the phased program is to continuously meet customer service and regulatory requirements through the end of the planning period

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Transmission System Rehabilitation Capacity

  • Inspection Program

    • Closed-circuit television and surface inspections

    • CCTV inspection annually on portion of system

    • CCTV taping of each interceptor every 10 years

    • Three categories based on degree of degradation

  • Transmission Division reviews to assess condition

  • Engineering Department performs second review, further refines the condition, develops a cost estimate and schedule

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Transmission System Rehabilitation Capacity

  • CIPP

  • Slip Lining

  • Manhole Rehab

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Transmission System Capacity Improvements Capacity

  • Transmission System hydraulic modeling

    • 2002 model updated with Sand Creek Basin Wastewater Master Plan

    • Model updated with revised population, employment, and unit flows

    • Model runs performed for 2007, 2015, and 2030

    • Assumed northeast Service Area flows will continue to RWHTF

    • Flow data being collected to further refine model calibration in 2008

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Basis for RWHTF Recommended Improvements Capacity

  • 2003 Facility Plan established basic direction

    • Five-stage air-activated sludge with BNR

    • Phasing out the high-purity oxygen system

  • North Secondary Improvements Project (PAR 942)

    • CaRRB process to address centrate treatment

  • Objective is to have similar processes in the North and South Complexes that operate and perform in a comparable fashion

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Projected Capital Expenditures Capacity

$1.86 billion projected 2008-2033

$1,528,000,000 – RWHTF

$332,000,000 – Transmission System

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Questions Capacity