Projects and Water Quality Anne Arundel County Department of Public - - PowerPoint PPT Presentation

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Mago Vista Area Capital Projects and Water Quality

Anne Arundel County Department of Public Works

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Agenda

• Provide details regarding the cleaning and

lining, and water house connection projects completed in your area

• Discuss problems encountered
• Provide information about County’s response
• Ensure residents that water is safe
• Discuss remaining work and lessons learned
• Answer questions

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Mission of the Department of Public Works

• Provide safe drinking water in public service areas
• Manage the collection and processing of wastewater in public service

areas

• Manage collection, processing and recycling of solid waste
• Design and construct public works, including roads, bridges, governmental

buildings and plants

• Construct, maintain and restore County roads
• Restore County waterways, and
• Administer the County’s MS-4 Stormwater Permit.

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County Water Infrastructure

• Over 1,200 miles of water mains
• 8,000 fire hydrants
• 18,000 valves
• Over 100,000 customer water service connections
• 12 Water Treatment Plants
• 35 Elevated Water Storage Tanks
• 18 Water Booster Pump Station

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Anne Arundel County Water Pressure Zones

• The County’s water system is divided

into 12 pressure zones or service areas

• 8 of the 12 zones are interconnected,

which enables the County to transfer water

• Other Areas are served by the City of

Annapolis, Fort Meade or are designated as Rural

Public Water Supply System

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Reason for this work

• Department of Public Works executed a contract to investigate and evaluate the feasibility of

rehabilitating 18,943 LF of water distribution mains in the Mago Vista community.

• This included; 12,355 lf of 6-inch, 3,170 lf of 8-inch, 587 lf of 10-inch and 2,831 lf of 12-inch water

main.

• Mago Vista water mains were mostly ductile iron (DIP) installed in the 50s and 60s
• Aged ferrous metal water mains develop a buildup of minerals over time.
• Buildup reduces hydraulic capacity and fire flow.

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Water Main Before and After Lining

Alameda Parkway

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Cleaning and Lining Project Details - Streets

• Mago Vista Rd.
• Windsor Rd.
• Buena Vista Ave.
• Barrett Ave.
• Bradford Ave.
• Harmony Ave.
• Clifton Ave.
• Alameda Parkway
• Sherman Ave.
• Jones Station Rd.

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Cleaning and Lining Project Details -Overview

• Cleaning and cement-mortar lining approximately 8,890 ft. of 6-inch, 1,670 ft
• f 8-inch, 600 ft of 10-inch and 2,830 ft of 12-inch water main, total 13,990 lf.
• Cleaning and Close Circuit TV inspection services of approximately 3,490ft of 6-

inch and 1,320 ft. of 8-inch water main; total 4,810 lf

• Installation of approximately 120ft of new 8- inch DIP water main and the

installation of new fittings and appurtenances including valves, tees, crosses and fire hydrants

• Reconnection of existing water house connections (WHCs) as well as replacing

115 existing aged WHCs with new copper pipe.

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Cleaning and Lining Project Details - Contractor

• This project was advertised for bid in August 2017.
• Bids opened on October 10, 2017.
• Contract awarded to J. Fletcher Creamer & Son, Inc., Beltsville, MD

(headquarters in NJ) on 2/7/18

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Cleaning and Lining Project Details – Notice to Proceed

2/22/18 Construction Notice to Proceed Issued 8/20/18 Original Conditional Acceptance 12/13/18 Revised Conditional Acceptance

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Cleaning and Lining Project Details

• The water main Cleaning and Cement Mortar Lining were completed

consistent with the American Water Works Association (AWWA) Manual of Procedure for Water Main Rehabilitation and the most recent AWWA Standard for Cement Mortar Lining of Water Pipelines in Place

• Cement Mortar linings were first installed in existing pipelines in the US

in 1930s. Currently, Cement mortar is applied to new ductile iron pipes and most new steel pipes before installation, making this method a standard in the water industry.

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Cleaning and Lining Project Details

Preparation of the Pipe Surface/Cleaning:

• The interior surfaces of the pipe to be lined shall be cleaned to remove corrosion products;

chemical or other deposits; loose and deteriorated remains of old lining materials; oil; grease; and accumulations of water, dirt and debris.

• The Mago Vista area pipes were cleaned using a metal scraper.

Lining Procedure:

• The lining shall be applied in one or more courses by a machine traveling through the pipe and

distributing the mortar uniformly across the full section and long radius bends of the pipe. The discharge shall be from the rear of the machine so that the newly applied mortar will not be

• marked. The rate of travel of the machine and the rate of mortar discharge shall be mechanically

regulated to produce a smooth surface and uniform thickness throughout.

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Examples of work

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Examples of work

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Cleaning and Lining Project Details – Process

Bypass Piping

• Necessary to maintain water service through above ground

piping.

• Lines are installed, flushed, and samples taken for testing by
• ur lab to ensure safe potable water.
• Water received through this pipe is the same potable water

distributed through underground mains.

• Above ground piping can be damaged by vehicles or vandalism,

and if this occurs you could be temporarily out of water.

• Contractor will have a repair person on call 24-hours a day to

make repairs as needed.

• Temporary piping is removed after the cleaning and lining

process is complete and individual house services are reconnected to the underground water main.

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Cleaning and Lining Project - Process

Flushing Procedure

• The re-lined main will be thoroughly flushed to remove loose sediments that

may have entered the system and to reduce the pH of the water. Flushing

• ccurs after lining cure time and before the sampling process.
• Water services remain connected to temporary system during flushing.
• Temporary connection with a backflow prevention device will be made between

a water source and the section of main to be flushed.

• Valves are opened/closed to direct water from source to flushing point. Flushing

points are opened, then the source is opened to flush the main.

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Cleaning and Lining Project - Process

After flushing

• Disinfection procedures are completed per AWWA standards and contract

requirements, and water samples are taken for bacteria testing After water samples pass

• Lines are restored to service per contract specifications. Water house

connections are reinstated, taking care to flush service line before reconnecting the meter.

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Cleaning and Lining Project - Process

Flushing Procedure-continued

• Flushing durations are determined by the size and length of pipe, along with

available flow from the surrounding system.

• Volumes of main to be flushed are determined, and then flushed long enough to

ensure that at a minimum; at least one turn over of volume of water with the main is achieved..

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Cleaning and Lining Project Details - Process

Sequence of construction

• a. Notify customers of the project start
• b. Locate the existing water pipes
• c. Install temporary by-pass water system, flush and test.
• d. Install Sediment Control Measures as needed
• e. Close local valves and dewater existing water lines (Phased Approach)
• f. Excavate Access Pits (there were more than 110 access pits excavated for this project)
• g. Clean the Pipes
• h. Pre-CCTV inspection & plug
• i. Install the recommended/selected lining system
• j. Post CCTV inspection of liner installation
• k. Hydrostatic pressure & leakage test
• l. Disinfect the water lines and perform bacteria test.
• m. Reconnect the water service connections.
• n. Notify customers of restored service and need to flush internal fixtures
• . Remove Temporary Water system
• p. Replace 113 Water House Connections
• q. Site restoration (Patch pits, final seeding and remove ESC measures)

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Restoring service from by-pass

• Mago Vista Road taken off by-pass 7/23 and 7/24
• Clifton Avenue taken off by-pass on 9/13
• Alameda Parkway taken off by-pass on 9/13
• Buena Vista Avenue (Phase II) taken off by-pass on 9/13 and 9/14
• Sherman Avenue Taken off by-pass on 9/17
• Windsor Road taken off by-pass on 10/10
• Buena Vista Avenue (Phase III) taken off by-pass on 10/2 and 10/3
• Barrett Avenue taken off by-pass on 10/12
• Bradford Avenue taken off by-pass on 10/11
• Harmony Avenue taken off by-pass on 10/12

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Sequence of Events - Actual

• Contractors placed re-lined pipe back in service on 10/12/18.
• DPW started receiving numerous water quality complaint calls.
• Issued phone notification on 10/15/18 at 4:44 p.m. to not consume the water until further notice.
• On 10/15/18, DPW collected additional samples in the affected area to test for bacteria.
• Bacteria test came back negative and was reported to MDE on 10/16/18 at 11:53 a.m.
• After consultation with MDE water supply program, DPW lifted water restriction and continued flushing on

streets where pH remained high until stable.

• It was determined that residents were not advised to flush pipes after switchover.
• The County also determined that there were three valves that were in the closed position during the flushing
• perations.
• Hard Flushing began on 10/17 from fire hydrants in the area
• Water samples were collected and analyzed twice daily (7) days a week from affected streets for pH;

alkalinity; hardness and turbidity

• More than 500 water quality analysis performed

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Closed Valves

The County also determined that there were three valves that were in the closed position during the flushing operations.

• Bradford Avenue and Broadwater Road
• Harmony Avenue and Broadwater Road

The closed valves created dead-end pipe lines that prevented isolated sediments from being flushed from the system and led to the dirty water complaints received in October once the rehabilitated mains were returned to service. DPW has continued its flushing program and daily sampling in an effort to return the system to pre- existing water quality.

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Explain Results

• The Safe Drinking Water Act identifies two types of drinking water

standards, primary regulations (such as lead, Mercury etc.,) to control health risks and secondary regulations to address aesthetic concerns such as taste and odor (such as pH, Fluoride and Iron).

• (AWWA Manual M28 Rehabilitation of Water Mains and AWWA Standard C

602-11 Cement Mortar Lining of Water Pipelines in Place 4” and Larger)

• Mains with low flow may experience high pH levels for a short time after

being returned to service.

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Turbidity Testing Results

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Alkalinity Testing Results

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Hardness Testing Results

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pH Testing Results

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Final Phase

113 Water House Connections were replaced by the contractor. Work was expected to be completed in January. The contractor used multiple crews to limit the impact on the community and completed this phase on 12/5/18.

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Work to be completed-Pavement Restoration

The contractor is currently working on roadway restoration.

• Restoration includes
• Striping
• Patch- Paving of excavated areas
• Filling pot holes

***Important Note***

There are more than 110 areas to be patched. Patching may be impacted by temperature 40 degree and rising. If we can’t complete by the end of the year, we will return in the spring to complete.

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Utility Billing

• Bills were estimated based on the property’s usage at the same

time the previous year during the billing period(s) that meters were removed to facilitate cleaning and lining.

• DPW recently read the meters for all properties affected by

cleaning and lining to determine the “current usage.”

• If the current usage is higher than the estimated bill(s), then

the estimates will stand as billed.

• If the current usage is lower than the estimated bills(s), then

the estimates will be adjusted to reflect current consumption.

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DPW Outreach

• Mailed over 600 notification letters to residents at start of project to detail work.
• 48 hour Notification to customers for each shutdown (door hangers)
• Field Inspector responding directly to resident’s inquiries and calls.
• AACO Customer Service, SER staff responding directly to customer inquiry and request
• Meeting with individual residents, and the (Mago Vista Civic Association)
• Hand delivered Flushing notifications
• Posted flushing signage throughout community.
• Posted flushing notice to community Facebook page
• Posted WHC replacement notification and description on Community Facebook Page
• Immediately responding with operations protocols to sampling and flushing to address concerns
• Coordinate residential claims with contractor
• Sampled sections of newly lined pipe
• More than 500 water quality analysis performed

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Damage Claims

John Dinicola Claims Supervisor

• J. Fletcher Creamer & Son, Inc.

101 E. Broadway Hackensack, NJ 07601 201-678-2666 (O) 201-343-0930 (F) jdinicola@jfcson.com

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Lessons Learned

• More customer notification/updates (meetings, email, Facebook, letters, posts to our website)

before the project start, updates throughout the project.

• Shorter response time by the contractor to "No water" complaints
• Periodic internal project updates (Dispatch, Emergency Services)
• PM approval that requirements have been met before the Contractor can progress to additional

phases.

• All required submissions need to be verified: testing, samples, cement quality, flushing plan, etc.
• Develop a response plan based on these experiences to address situation like this in the future.
• Limit size of the area on by-pass
• Express need to resident to run fixtures when service is restored
• Do not disassemble by-pass piping until flushing complete and normal service is restored.

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Additional Information

Beverly Ingram Project Manager 410-224-1277 pwving90@aacounty.org

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Bureau of Utility Operations

24-Hour Emergency Water Services: (410) 222-8400 Billing Inquiries: (410) 222-1144

Bureau of Waste Management Services

Bulk Trash Service/Curbside Collections: (410) 222-6100

Bureau of Highways

Northern District: (410) 222-6120 Central District: (410) 222-7940 Southern District: (410) 222-1933 Traffic Lights/Signs: (410) 222-1940

Bureau of Engineering

General Inquiries: (410) 222-7500

@AACoDPW www.facebook.com/annearundeldpw