Distribution System Upgrades to Improve Water Quality
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1 Distribution System Upgrades to Improve Water Quality Christopher Evans, P.E., Hatch Mott MacDonald
2 Outline Replace Water Lines Project Project Purpose Study Phase Utility Source Evaluation Elevated Storage Tank Evaluation Plumbing System Evaluation Distribution System Evaluation Hydraulic Model Design Phase Construction Phase Conclusions
3 Harrisburg, Pennsylvania Vicinity Project Driver Brown Water Quality Complaints Consecutive Distribution System Purchase Water From Utility Booster Pump Station / Chlorine Booster Station 250,000 Gallon Elevated Storage Tank Business Campus Established in 1947 Project Purpose Business Model Changes -Large Reduction in Water Demand
4 Project Scope Project Purpose 20,040 Linear Feet of Distribution System Investigate Condition 6 Buildings (18 Stories) - Investigate Plumbing Condition Identify Source of Brown Water Quality & Design Upgrade Utility Source Evaluation Elevated Storage Tank Evaluation Distribution System Evaluation Plumbing System Evaluation
5 Site Plan Project Purpose Booster Pump Station Service Connection Elevated Storage Tank
6 Site Plan Project Purpose Booster Pump Station Service Connection Elevated Storage Tank Blue Buildings Brown Water Quality Issues
7 Study Phase Utility Source Evaluation CCR Primary Contaminants Normal Ranges No Apparent Discolored Water Source
8 Study Phase Utility Source Evaluation CCR Secondary Contaminants Fe & MnNormal Ranges ph Abnormally High
9 Utility Source Evaluation Distribution Samples Fe Normal Range 0.01 to 0.04 ppb MnNormal Range 0.00 to 0.04 ppb Elevated Storage Tank Evaluation Recent inspection No solids accumulation Interior coating needed replacement Tank not considered source Tank scheduled for replacement Study Phase
10 Water Quality Sampling Event Service Connection Samples Fe (Total) 0.48 ppm Study Phase Mn 0.02 ppm 10 Sample Locations Plumbing & Distribution System Fe (Total) Range 0.48 to 4.8 ppm MnRange 0.02 to 0.33 ppm
11 Plumbing System Evaluation Study Phase Galvanized Pipe - 60 Years of Service
12 Distribution System Evaluation Bone Yard Study Phase Transite Pipe - 60 Years of Service
13 Distribution System Evaluation Study Phase Condition Assessment Spool Piece Unlined Cast Iron Pipe - 60 Years of Service
14 Distribution System Evaluation Limited Distribution System Understanding Study Phase Pipe Material: Yes Pipe Diameter: Yes Interior Lining: No Water Quality: Soil Conditions: Break History: No No No Exterior Coating: No Non-Revenue Water: No Pipe Condition: No Renewal Rate: No Year Installed: 30 Year Accuracy Construct Distribution System Map / GIS Database
15 Distribution System Evaluation Study Phase Transite (ACP) 1947 Unlined Metallic After 1947 DIP Cement Lined After 2000
16 Distribution System Evaluation Study Phase Transite (ACP) 1947 Unlined Metallic After 1947 DIP Cement Lined After 2000 Blue Buildings Brown Water Quality Issues
17 Hydraulic Model Study Phase Diameter Length (ft) < = 4" 3,955 6" 4,880 8" 2,915 10" 3,525 12" 4,765 Total Pipe 20,040
18 Hydraulic Model C Value Tests Gauge Health Calibrate Model Study Phase
19 Hydraulic Model C Value Tests Start 10 Minutes Study Phase
20 Hydraulic Model C Value Tests Test No. Pipe Material Pipe Diameter Study Phase Calculate d C-Value Design C-Value 1 Asbestos-Cement 8" Cast Iron 12" Cast Iron 10" Cast Iron 8" Cast Iron 10" Asbestos-Cement and Cast Iron 6" 83 N/A Hazen and Williams Friction Factor C
21 Study Phase Hydraulic Model Existing Available Fire Flow Maximum Day Demand 20 psi Min. Pressure Available Fire Flow 12 of 36 < 1,500 gpm
22 Study Phase Hydraulic Model Proposed Available Fire Flow Yellow = Proposed Cleaning & Lining Fire Flow > Domestic Demand Maximum Day Demand 20 psi Min. Pressure Available Fire Flow All 36 > 2,500 gpm
23 Recommended a Tiered Approach Tier 1 Water Quality Monitoring Program Baseline Water Quality Monitor Upgrade Water Quality Improvements Tier 2 WatermainUpgrades Fire Flow > Domestic Demand Watermains Oversized for Domestic Demands 6-inch Diameter and Larger Cleaning & Lining 4-inch Diameter and Smaller Replacement Tier 3 Building Plumbing Upgrades Select highest priority building Design Phase
24 Why Cleaning and Lining? Pros Cost Savings Time Savings Less Disruption Typically Cheaper to Repair Than Replace Pipe Design Phase Cons Risk Unknown Subsurface Conditions Unknown Pipe Condition Pipe Diameter Increase Rehabilitation Cost Savings Increase
25 Cleaning & Lining Project Requirements? Access Pits Every 500 to 700 Linear Feet Access Pit Typical Locations In Line Valves Side Line Mains Hydrant Laterals Fittings 22 ½ to 90 Degree Elbows Pipe Diameter Change Design Phase
26 Recommendations Design Phase Phased Construction Rehabilitation by Cleaning and Lining 7,500 linear feet of Cleaning and Cement Mortar Lining 1,200 linear feet of service connection replacement Base Bid Bid Alternates to control contract upper limit Source: Heitkamp, Inc.
27 Install Bypass Pipe Disinfect Bypass Pipe / Bacteria Test Install Bypass Service Connections Bypass Hydrant Construction Phase Bypass Service Connection
28 Excavate Access Pits Construction Phase Isolate Water Main Remove Water Main From Service Cut Water Main At Access Pits Rehabilitate Water Main Cleaning & Cement Mortar Lining
29 Construction Phase Cleaning Scrapers Tuberculation Removal at Access Pit
30 Repair Water Main At Access Pits Disinfect Water Main / Bacteria Test Restore Water Main Service Connections Remove Bypass Construction Phase Road Restoration At Access Pits
31 Rehabilitation Versus Replacement Project Specific Comparison Recommended Conclusions Cleaning & Cement Mortar Lining Cost Savings Accomplished Client Goals of Reducing Brown Water Quality Extends Watermain Service Life Client In Process of Removing Bottled Water Stations
32 Acknowledgment Herb Spencer, Shannon Chemical Corporation HMM Staff Jeff Abrams Vince Manners Kate Greising Mike DeNichilo
33 Questions Christopher A. Evans, P.E. Associate Hatch Mott MacDonald The Public Ledger Building, Suite South Independence Mall West Philadelphia, PA P: (215) F: (215) M: (215)
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INSTRUCTIONS FOR A REPORT OF INSPECTION FOR AN ON-SITE WASTEWATER TREATMENT FACILITY INSTRUCTIONS Within six months before the date of a property transfer, the person who is transferring a property served