City of Buda Wastewater Master Plan

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City of BudaWastewater Master Plan

Final Report Presentation

Graham Moore, PE

October 16, 2012

PLANNING | ENGINEERING | PROGRAM MANAGEMENT

Summary

Purpose:

Provide a plan for the City as to the required improvements and

additions necessary to convey and treat wastewater through 2040.

Agenda:

• Background

• Council Direction on WWTP Location

• Growth Projections

• Sewer CAD Model Development and Analysis

• Recommendations



Background


Buda WWTP Sunfield WWTPExisting Capacity 1.5 MGD 0.25 MGDTreatment Process Complete‐mix Extended‐aerationExisting Permit

(CBOD – TSS – N – P) 7 – 12 – 2 – 1.2 5 – 5 – 2 – 1

Future Capacity (Permitted)

1.5 MGD 0.99 MGD

Future Permit(CBOD – TSS – N – P) 5 – 12 – 2 – 0.8 5 – 5 – 2 – 1

Ultimate Capacity(Possible On Site)

4.0 MGD 5‐7 MGD

Ultimate Treatment Process Complete‐mix Complete‐mixPotential Re‐use Type I Type I

Ultimate Needs for Sunfield ‐ 3.0 MGD


Wastewater Treatment Plant - Options

Options Considered:

• Option 1 – Approx. 1.0 MGD of Buda wastewater treated at Sunfield

WWTP & 3.0 MGD treated at Buda WWTP

• Option 2 – Buda WWTP converted to a lift station (LS) and all Buda

wastewater treated at Sunfield WWTP

• Option 3 – All Buda wastewater treated at Buda WWTP

• Option 4 – Buda WWTP limited to 1.5 MGD & Sunfield WWTP

expanded 2.5 MGD



Wastewater Treatment Plant - Options

Options Considered:

• Option 1 – Approx. 1.0 MGD of Buda wastewater treated at Sunfield

WWTP & 3.0 MGD treated at Buda WWTP

• Option 2 – Buda WWTP converted to a lift station (LS) and all Buda

wastewater treated at Sunfield WWTP

• Option 3 – All Buda wastewater treated at Buda WWTP

• Option 4 – Buda WWTP limited to 1.5 MGD & Sunfield WWTP

expanded 2.5 MGD


Option Selected by Council on January 3, 2012


Option 4 Development

Scenario Highlights

• Requires agreement with GBRA to expand the Sunfield WWTP

• Sunfield WWTP becomes a regional plant

• Existing “Downtown” WWTP stays at current 1.5 MGD capacity

• Requires new regional lift station to replace the Night Hawk lift

station to convey flow from west to east

• Convert flows from South Buda WCID #1 to discharge directly to

Sunfield WWTP



Growth Projections


11,024

15,061

19,912

25,452

31,690

38,574

45,987

2.80

3.013.17

3.293.38 3.45 3.50

0.0

1.0

2.0

3.0

4.0

0

10,000

20,000

30,000

40,000

50,000

2010 2020 2030 2040

Avg. Hou

seho

ld Size

Popu

latio

n

Year

Population Growth

Avg. Household Size


Sewershed Map – Growth Projections



Sewer CAD Model Development and Analysis

Model Setup:

• Entered actual flowline data from as-built drawings for the City

• Average daily flows were entered into the model based on lot counts

or water meter size

• Setup controls for lift stations to simulate actual operations

• Model estimated average flows of 1.017 MGD for the existing

condition; recorded inflow was 1.005 MGD (1.2 % error)




Residential Diurnal Curve:

• Peaks in morning (~7:30AM)

and in Evening (~9:30PM)

• Peak is 1.5 times average flow


Non-Residential Diurnal Curve:

• Peaks between 8 AM and 6 PM

• Peak is 2.0 times average flow



Analysis:

• Future growth demands were loaded into the model based on the

future projections discussed previously

• Model was run to simulate ultimate conditions (2040) to identify

system deficiencies and ultimate capacities

• Model was then run to simulate years 2030, 2020 and 2015 to identify

timing and phasing of proposed improvements



Map of Improvements



Recommendations


Priority Rank Proposed BudgetYear(s)

Project Title

1 2011‐2013 DowntownWastewater Rehab2 2012‐2013 Sportsplex Sewer Line Upsize3

2012‐2013Bradfield‐Lifschutz‐Stonefield

Interceptor (BLSI) Flow Monitoring Study

4 2013‐2014 Garlic Creek Lift Station5 2013‐2014 Lifschutz Bottleneck Replacement6 2013‐2015 S. Loop 4 LS Decommissioning &

Gravity Extension7 2013‐2015 Stonefield LS and Force Main to

Sunfield8 2014‐2015 Sunfield WWTP 0.5 MGD Capacity9 2016‐2017 Oxbow Interceptor


Recommendations



Project Title

10‐A 2016‐2020 WCID #1 LS Relocation & Hillside Terrace Interceptor

10‐B 2016‐2020 Main Street FM Phase 110‐C 2016‐2020 Sunfield WWTP 1.0 MGD Capacity

(Cumulative)10‐D 2016‐2020 Overlook LS & FM Improvements10‐E 2016‐2020 Old Nighthawk LS Decommissioning15‐A 2021‐2030 Main Street FM Phase 215‐B 2021‐2030 Night Hawk LS Upgrade15‐C 2021‐2030 Sunfield WWTP 1.5 MGD Capacity

(Cumulative)15‐D 2021‐2030 Meadows at Buda Interceptor


Recommendations



Project Title

15‐E 2021‐2030 West FM 967 Upsize15‐F 2021‐2030 West FM 967 LS & FM21‐A 2031‐2040 Buda Elementary LS Upgrade21‐B 2031‐2040 FM 2001 Wastewater

Improvements21‐C 2031‐2040 Sunfield WWTP 2.5 MGD Capacity

(Cumulative)21‐D 2031‐2040 Onion Creek Interceptor21‐E 2031‐2040 SE Buda LS & FM #2


Recommendations

Non-Project Related Recommendations:

• Flows at Downtown WWTP will likely pass the 75% threshold by next

Summer – triggers design for next treatment phase

• Continue to monitor growth to determine when projects need to occur

• Update SewerCAD model with new sewer lines/development every

other year (or as needed)

• Use the Master Plan with developers for discussions related to sewer

service to new areas



GBRA Partnering

Memorandum of Understanding (MOU):

• Staff has discussed an MOU with GBRA for preliminary engineering

on the Sunfield Plant.

• MOU will be brought to Council on 10/30.

• City’s participation in preliminary engineering will be capped at

$40,000.

• MOU states that future agreements are anticipated that will discuss

plant ownership, phasing, operations, etc.

• MOU will expire in approximately 6 months unless extended by

Parties; City has right to terminate if it gives 30 days notice.


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QUESTIONS

City of Buda Wastewater Master Plan

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