Brandywine Hundred Sanitary Sewer Rehabilitation Project

Transcription

1 Brandywine Hundred Sanitary Sewer Rehabilitation Project 12 th Year Status and Accomplishment Summary March 2012

2 Ahhh!! The Good Ole Days Foulk & Silverside Roads (Low Population / Low Flows)

3 And Now Foulk & Silverside, Foulk & Grubb (Higher Population / Higher Flows)

4 The Area Population Skyrocketed Development Was Great Growth from Wilmington to the Suburbs Sanitary Sewer Systems were Added-On and Piggy Backed right up to the Pennsylvania line Initially built by developers with direct discharges to the River or through small WWTP s to the streams First Interceptors built in 40 s s and 50 s s to begin regionalization of system and improve treatment Current interceptor system built in 50 s, 60 s, and 70 s s with federal funds and all sewage going to Wilmington WWTP Designed to accepted national standards of the time with relief structures throughout interceptor system

5 Remember the Days (1999) Years of Deferred Maintenance Took its Toll

6 Remember the Days (1999) z z z Broken and collapsing pipes, laterals, and manholes Chronic root intrusion/blockages Leaking pipe joints and manholes

7 The Rehabilitation Project Begins Development of a Program Deficiencies in the system became more frequent and noticeable Accelerated Customer Complaints were logged The Dreaded 308 Letter arrived - EPA s s precursor to a consent decree (National and Regional tightening of screws on local system operators) Other operators around the country had $1 Billion plus and $900 million plus EPA consent decrees Although NCCo held our system together as best it could within the allowable budget constraints We proactively enacted steps to develop a program to analyze and improve our conveyance system This was a joint effort between the Administration and Council. Our program was sound and defensible The Program was funded and we started

8 The Program Detailed inventory of the entire system (Investigation) Determination of system age (Investigation) Analysis of existing operations (Investigation) Detailed reconnaissance of how system functioned (Investigation) Flow Monitoring (Investigation) Logical formulation of potential remedies and their anticipated effectiveness (Analysis) * Prioritization of projects The Plan Design and implementation of projects The Plan Effectiveness modeling The Plan Implementation of Asset Management The Plan

9 Forensic Investigation Flow Monitoring Diurnal - Night & Day Readings Night Time Base Readings Storm Events Smoke Testing CCTV Investigation Visual Inspections Interviews with long time staff

10 Forensic Investigation Attributes Identifies Specific Issues Allows for a Developed Master Plan Used for Specific Program Development Ranks Issues for Prioritization Provides Sequence of Activities Saves Money with Logical Plan Implementation Provides Basis for Biggest Bang for Buck

11 EXCESSIVE RAINFALL INDUCED FLOWS Rain Flow 1.20 Rainfall: 1.58" Night / Morning / Afternoon / Eve Duration: 12 hrs Med / Hard / Light / Quick / Steady Flow Characteristics Quick Dropoff No Impact Response: Quick / Slow Slow Dropoff Peak: 3.5x jump Lag: 4 hours 0.30 Flow (MGD) Probable Problems Manhole Cover Leaks Roof Drains Storm Drains Sump Pumps Rainfall-Induced Infiltration Basin Charateristics 9.7 miles of pipe Total Inflow: 1000 k gpd 80 inch-miles Inflow/mile: 103 k gpd/mi Smoketest: Y / N Inflow/inch-mile: 12.5 k gpd/in-mi Rain (in/hr) /17 11:00 AM 05/17 3:00 PM 05/17 7:00 PM 05/17 11:00 PM 05/18 3:00 AM 05/18 7:00 AM 05/18 11:00 AM 05/18 3:00 PM 05/18 7:00 PM 05/18 11:00 PM 05/19 3:00 AM 05/19 7:00 AM 05/19 11:00 AM 05/19 3:00 PM 05/19 7:00 PM 05/19 11:00 PM 05/20 3:00 AM 05/20 7:00 AM 05/20 11:00 AM JULY ND16 - Bellevue Road New Castle County FIGURE 4 May 17 to May 20, 2002

12 The Program (2) Detailed inventory of the entire system (Investigation) Determination of system age (Investigation) Analysis of existing operations (Investigation) Detailed reconnaissance of how system functions (Investigation) Flow Monitoring (Investigation) Logical formulation of potential remedies and their anticipated effectiveness (Analysis) * Prioritization of projects The Plan Design and implementation of projects The Plan Effectiveness modeling The Plan Implementation of Asset Management The Plan

13 *Secretary s s Order Original Order 2003 Amended Order 2008 Eliminate the CSO Structures in Brandywine Hundred (2) Southern Delaware County Sewer Authority Removed from County System Improvements to Sanitary Sewer System Access and make improvements Replacement of Stoney Creek Pump Station Manhole Evaluation and Rehabilitation Develop dynamic hydraulic model Revise assessments and update capital improvements

14 *Secretary s s Order Original Order 2003 Amended Order 2008 Minimization of County-Wide Sanitary Sewer Overflows (SSOs( SSOs) SSO Response Prodedures Fats, Oils, & Grease (FOG) Program Commercial Food Establishments (CFE) Public education and outreach programs Website providing information to public on effects of FOG Continue grease abatement program Capacity Management Operation Maintenance Program (CMOM) Maintenance Pump Stations Maintenance Wastewater Treatment Plants

15 NOW Back to the Presentation

16 Investigation & analysis led to The Plan Our plan was devised to strategically perform projects which would provide for the greatest results with the most efficient use of resources. Which means big reduction of I&I at the lowest cost.

17 The Plan was the most cost effective and greatest impact solution! We Did Not Subscribe to the PARTS REPLACEMENT THEORY!!! (Which is arbitrary and without skill)

18 Original Project Priority Map

19 Date Completed Projects (1) Project June '00 Old Naamans Interceptor Re-Opening June '00 Rolling Park Interceptor Repair June '00 Seller's Park Interceptor Rehab Feb '03 Knollwood Repairs Feb '05 Lower Valley Run Interceptor Expansion Feb '05 Upper Valley Run CIPPL Dec '05 SP-24 Test & Seal Oct '06 Naamans Pump Station Upgrade Jan '07 SP-24 CIPPL Feb '07 Northcrest Afton June '07 NA-2 2 CIPPL July '07 NA-2 2 Test & Seal Oct '07 Stoney Creek Pump Station Oct '07 Edgemoor Pump Station Build-out Aug '08 SP-24 CIPLL Jan '09 Bringhurst Interceptor Washingot Street Extension March '09 NB 2005 Sept '09 Ashbourne Hills / Radnor Green (CIPPL, CIPLL, MH) Sept '09 NA-2 2 CIPLL Oct '09 SP-24 MH Dec '09 Claymont Heights 2 June '10 Manholes Phase 1 June '10 Maholes Phase 2

20 Date Completed Projects (2) Project Feb '11 NA-2 2 MH April '11 NB 2007 Test & Seal July 11 BW2009 CIPPL Aug 11 BW 2009 Test & Seal Aug '11 Claymont Test & Seal Aug '11 Fairfax Test & Seal Sept '11 NB 2007 CIPPL Sept '11 Shellbourn XPR's (CIPPL) Sept '11 SP-23 CIPPL Sept '11 SP-27 CIPPL Oct '11 SP-23 Test & Seal Oct '11 SP-27 Test & Seal Dec 11 Fairfax CIPPL Jan 12 Fairfax Clean outs Feb 12 Old Shellpot Interceptor Rehab Feb 12 North Delaware Interceptor

21 Projects Under Construction Brandywine Hundred Projects Currently Under Construction Gov. Printz Interceptor Replacement Brandywood Trunkline Replacement Surrey park Trunkline Replacement SP-27 CIPLL Lateral Rehabilitiation Branmar $17 Million Allan Meyers $2.6 Million Allan Meyers $3.6 Million Eastern States $2.9 Million Musson Brothers $1.2 Million Joa & Bradley NB-07 Cleanouts $1.0 Million Reybold Const. SP-23 Lateral Rehab $2.6 Million BLD Edgemoor Gardens Phase I $4.8 Joa & Bradley Old Shellpot Int. Access Rds. $0.9 Million Eastern States $36.6 Million

22 Projects Currently Being Bid Project Engineers Estimate NB-07 Lateral Rehab $2.9 Million Claymont Cleanouts Stockdale Cleanouts Claymont Lateral Rehab Old Shellpot Phase 2 Failfax Pipe Lining $0.5 Million $0.6 Million $3.4 Million $2.3 Million $4.1 Million $13.8 Million

23 Rehab Complete by end of 2006 Insert figure showing In Design or red and Construction in green ¾ 2007

24 Rehab Complete by end of 2007 Insert figure showing In Design or red and Construction in green ¾ 2008

25 Rehab Complete by end of 2008 Insert figure showing In Design or red and Construction in green ¾ 2009

26 Rehab Complete by end of 2009 Insert figure showing In Design or red and Construction in green ¾ 2010

27 Rehab Complete by end of 2010 Insert figure showing In Design or Construction red and in green 2011

28 Rehab Complete by end of 2011 Insert figure showing In Design or Construction red and in green 2012

29 Rehab Complete by end of 2012 Insert figure showing In Design or Construction red and in green 2013

30 Funds Expended To Date By Fiscal Year $.025 Million $.195 Million $ Million $ Million $ Million $ Million $ Million $ Million $ Million $ Million $ Million $ Million $ Million TOTAL..$ Million

31 So What Does This Mean? What did we accomplish? We have developed a CMOM program We have instituted an aggressive Fats, Oils & Grease (FOG) program We have instituted an aggressive Root Control Program We have instituted a Trunkline Preventative Maintenance Program We have instituted a CCTV Investigations Program We Re-constructed a bigger and better Stoney Creek Pumpstation We developed a Dynamic Hydraulic Model We have achieved 50-80% I&I reduction when we originally debated 0%-35% We have reduced basement back-ups by 40-50% We have reduced SSOs by 40-50% We eliminated flows at ND-7 We have significantly reduced flows at ND-34 and feel we are on the cusp of a zero flow breakthrough (7 years early) We have eliminated our routine resident calls from the Community of Brandywood Upon completion of a current construction project, we will eliminate our contacts with Tarleton which will hamper our social life. (Staff will no longer be invited to family functions like weddings)

32 Abandoned June 2006 ND 7 Flows

33 ND 34 Flows Weir raised an additional 2 ½ Additional monitoring to take place during spring rains

34 We had this Cracked & Broken Pipe Hydrogen Sulfide Corrosion Loss of Concrete & Exposed Rebar

35 And This Leaking Pipe Joint Collapsed Pipe

36 And Now we Have This

37 CLEANOUT INSTALLATION METHODS And you wondered why the residents complained Traditional Open-Cut Vac-A-Tee

38 VAC-A-TEE Minimal Intrusion

39 Capacity and system operation has improved so that we no longer have to hope for the best during a New Stoney wet weather event Stoney Creek Pump Station increased from 19 mgd to 45 mgd with wet weather capacity to 57 mgd -And- Our old method of sewer capacity analysis and calculation has improved from this

40 Sewer Capacity Determination Process

41 To This

42

43 Congratulations to all!!!