Identifying Critical Sewer Lines

1. Identifying Critical Sewer Lines Jon Kreischer

2. Project Definition • Identify Critical Sewer Lines in College Station • Necessary Step by Utilities Mngr • $3 million budget • $1.9M Treatment • $1.1M Collection • Research CS Preventative Maintenance Capabilities & Strategies Jon Kreischer

3. Sewer Maintenance • Historical Perspective • Reactionary vs. Proactive Strategies • Cost Effectiveness • Material Type • Life Cycle Costs • College Station • $3M Sanitation Budget, $1.1M for O&M of sewer collection system Jon Kreischer

4. Preventative Maintenance • Types of Preventative Maintenance • Mechanical Sealing • External Grouting • Root Removal • Cleaning: Jet Rodding • Biological Agents: De-Greaser Bugs • College Station’s Tools • Jet Rodding, Bugs, TV equipment Jon Kreischer

5. Category A High Impact System on surrounding environment Post-failure Rehab is twice as expensive as planned replacement/four times cost of scheduled rehab Require preventative maintenance Category B Less critical than A because of reduced failure cost and effect. Preventative action is still cost effective Category C Non-critical Sewers Preemptive Work in these sewers would not be cost effective Critical Categories of Sewers Jon Kreischer

6. Old Age Deeper than average Clay pipes Located under busy streets Difficult access Located in Poor Soil Conditions Difficult to bypass Require Frequent Inspection or maintenance Near sensitive environmental area Critical Sewer Characteristics Jon Kreischer

7. Critical Sewer Lines in College Stations • Large Lines – 13” or greater • Busy Street – Texas Ave • Require Frequent Maintenance • Vitrified Clay Pipe • Tree roots and grease Jon Kreischer

8. Original Sewer Lines Theme Sewer lines range from 4” to 32”. There is over 1.2 billion liner feet of sewer lines. Jon Kreischer

9. Sewer Line Attribute Table Jon Kreischer

10. Critical Sewer Lines - 1 Large sewer lines account for 1/8 of the network and include 215,000 liner feet of sewer lines. Jon Kreischer

11. Critical Sewers Lines - 2 Texas Ave is the primary road through College Station and Bryan. Jon Kreischer

12. Critical Sewer Lines - 2 The resulting Arcview Query identified only 14 of 4600 sewer segments that intersected Texas Ave. 6 of the 14 lines were larger than 13”. Jon Kreischer

13. Critical Lines - 3 6” – 8” clay lines account for nearly 1/2 of the entire line segments and over 500,000 liner foot of sewer lines. Jon Kreischer

14. The Project Continues • Working with Manholes • Manhole Point Theme • Network Analysis • Conclusions Jon Kreischer

15. Sanitation Work Force • Preventative Maintenance • Locating the Manholes Jon Kreischer

16. Any Questions Jon Kreischer