Special Order by Consent Special Order by Consent Wastewater Collection Wastewater Collection Improvement ProjectsImprovement Projects

Mark Fisher and Dennis Mark Fisher and Dennis AsburyAsbury

Final Report to City of Eden

October 20, 2009

• SOC Project –Linework and Pump Station (Phase 1 through 4)

Items to be Reviewed

SOC Linework - Phase 1 SOC Linework - Phase 1 • Consisted of Pierce Street Sewer Collector and portion of Meadow Greens

Western Outfall• Separated from larger portion of work to prevent conflict with NCDOT

widening and improvements of Pierce Street• Provided cost savings since open cuts to install sewer in Pierce Street were

overlaid by NCDOT • Completed – October 2005

SOC Linework Phase 2 SOC Linework Phase 2

• Consisted of 27,000 linear feet of sewer replacement (8 to 12 inches) –

See Handout 1 • Included numerous point repairs• Provided new and up to date flow monitoring equipment to the City

which have been critical in the assessing the performance of the repairs• Completed – December 2006

SOC Linework - Phase 3 SOC Linework - Phase 3 • Elevated manholes adjacent to tributaries that are subject to flooding and submergence• Replaced several small sections of deteriorated sewer including the replacement and relocation of the

upper section of sewer on Mebane Street (Phase 2 involved the “lower” section on Mebane Street)• Relocated and replaced the sewer crossing of Fairway 1 and Fairway 9 of the Meadow Greens Golf

Club (existing sewer was routed through a large storm drain)• Relocated a small portion of the Long Street outfall. • Replaced vented manhole lids with solid covers in multiple street locations that were exposed to medium

to heavy runoff.

• Completed January 2008

Project Objectives (Phase 1 – Phase 3)

Project Objectives (Phase 1 – Phase 3)• Reduced inflow and infiltration (I&I)

• Reduced sanitary sewer overflows (SSOs)• Secured sanitary sewer easements of approximately 125 affected parcels or properties. Prior to

construction, the City did not possess recorded easements. The description of such an easement is prescriptive in nature and is not ideal for long term operation and maintenance.

• Removed several sewer conflicts with improved and or habitable structures.• Bolstered water pressure and fire flow along Mebane Street with the 6-inch water main extension.

• Procured flow monitoring equipment that will be critical in identifying locations and extent of inflow and

infiltration in other subsystems

Project Performance(Phase 1 – Phase 3)Flow Monitoring Results

Representative RainfallRainfall Amount(inches)

Meadow Greens Peak Wet Weather

Flow(MGD)

Covenant Branch Peak Wet Weather Flow(MGD)

Dan River Peak Wet Weather Flow(MGD)

Pre-construction (September 6-8, 2004)

3.35 >1.80 2.73

Pre-construction (June 14-15, 2004

2.34 0.93

Post-construction (March 15-17 and June 3-4, 2007)

2.11 1.15

Post-construction (October 24-27, 2007)

3.52 0.61 0.87

Estimated Reduction (average 2-inch rainfall)

36% 34% 68%

Estimated 2.85 MGD of I&I reduced

Project Performance(Phase 1 – Phase 3)

Summary of Overflow History

Year Total Annual Rainfall(inches)

Meadow Greens Covenant Branch Dan River

Number of SSOs

Largest Single Event(gallons)

Number of SSOs

Largest Single Event(gallons)

Number of SSOs

Largest Single Event(gallons)

2003 60.22 16 1,421,040 16 398,860 7 280,488

2004 43.79 10 31,497 6 6,375 8 53,243

2005 38.11 5 25,647 8 34,850 0 -

2006 43.17 4 16,513 10 34,440 0 -

2007 37.02 3 50,300 3 280,488 1 29,971

Project Status(Phase 1 – Phase 3)

•All improvements are complete and operational.

•The City and WK Dickson dealt with the usual restoration complaints and warranty issues. All known warranty issues are resolved.

•Project was closed out in May 2009 including record drawings and final payment to Contractor.

•Total Project Cost - $6,091,400 (Does not include land acquisition and legal costs)

•Rural Center Grant Reimbursement Received - $500,000

SOC Pump Station - Phase 4 SOC Pump Station - Phase 4 • Upgrades to Meadow Greens, Covenant Branch and Dan River Pump

Stations (Kuder Street Pump Station was included to take advantage of economies of scale)

• Reliability and performance based improvements Increase to flow capacity at Meadow Greens and Covenant Branch to match peak wet weather flow (See Handout 2)

Project Performance(Phase 4)

Peak Pumping Capacity

Meadow Greens

Covenant Branch

Dan River Kuder Street

Existing (MGD) 0.50 1.35 0.835 2.520 to 3.6

Proposed (MGD)

1.00 1.5 to 1.7 0.835 3.312

Confirmed(MGD)

0.937 1.6 0.896 3.638

Summary of Pump Station Firm Capacities

Meadow Greens (Phase 4)Meadow Greens (Phase 4)

Meadow Greens - Before

Meadow Greens -After

Meadow Greens (Phase 4) Meadow Greens (Phase 4)

Meadow Greens - Before

Meadow Greens -After

Covenant Branch (Phase 4)Covenant Branch (Phase 4)

Covenant Branch - Before

Covenant Branch -After

Covenant Branch (Phase 4)Covenant Branch (Phase 4)

Covenant Branch - Before

Covenant Branch -After

Dan River (Phase 4)Dan River (Phase 4)

Dan River - Before

Dan River -After

Dan River (Phase 4)Dan River (Phase 4)

Dan River - Before

Dan River -After

Kuder Street (Phase 4)Kuder Street (Phase 4)

Kuder Street - Before

Kuder Street -After

Kuder Street (Phase 4)Kuder Street (Phase 4)

Kuder Street - BeforeKuder Street -After

Project Status(Phase 4)

•All improvements are complete and operational.

•The project is under the One-Year Warranty. 11th Month Warranty Inspection will conducted in July 2010.

•Project will be closed out in October 2009 including record drawings and final payment to Contractors.

•Total Project Cost - $3,882,900

SUCCESSFUL PARTNERSHIP OF CITY OF EDEN, ITS CITIZENS, NCDENR, CONTRACTORS AND WKD

Acknowledgments

•WK Dickson

•Medlin Law Office

•Billings and Garret, Inc.

•Ralph Hodge Construction Company

•James E. Harris Construction Company

•Gilbert Engineering Company

•Mayor and Elected Coucil

•City Administration

•Environmental Services

•Engineering

•Planning/Inspections

•Finance

•North Carolina Rural Center

•NCDENR DWQ AND EMC

Where Are We and What’s Next

•SOC has been completed and has been terminated.

•Sanitary Sewer Evaluation Study (SSES) needs to be completed in Bridge Street and Junction subsystems to complete sanitary sewer improvements prioritization.

Where Are We and What’s Next

•Continued improvements to rehabilitate and renew your system in a prioritized and proactive manner are recommended to mitigate another SOC.

•Priorities include:-Dry Creek Outfall Phase 2

-Smith River Outfall Phase 2 and 3

-Kuder Street Subsystem Improvements - Phase 1 through 3

-Bridge Street and Junction Pump Station Upgrades

(Prioritized Improvements yet to be identified in Bridge Street and Junction)

QUESTIONS AND COMMENTS