Mago Vista Area Capital Projects and Water Quality Anne Arundel County Department of Public Works DPWandYOU.com | Making a difference, together
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 • DPWandYOU.com | Making a difference, together
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. • DPWandYOU.com | Making a difference, together
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 DPWandYOU.com | Making a difference, together
Public Water Supply System 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 DPWandYOU.com | Making a difference, together
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. • DPWandYOU.com | Making a difference, together
Water Main Before and After Lining Alameda Parkway DPWandYOU.com | Making a difference, together
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. DPWandYOU.com | Making a difference, together
Cleaning and Lining Project Details -Overview Cleaning and cement-mortar lining approximately 8,890 ft. of 6-inch, 1,670 ft • of 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. DPWandYOU.com | Making a difference, together
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 DPWandYOU.com | Making a difference, together
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 DPWandYOU.com | Making a difference, together
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. DPWandYOU.com | Making a difference, together
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. DPWandYOU.com | Making a difference, together
Examples of work DPWandYOU.com | Making a difference, together
Examples of work DPWandYOU.com | Making a difference, together
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 • our 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. DPWandYOU.com | Making a difference, together
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 occurs 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. DPWandYOU.com | Making a difference, together
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. DPWandYOU.com | Making a difference, together
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.. DPWandYOU.com | Making a difference, together
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 o. Remove Temporary Water system p. Replace 113 Water House Connections q. Site restoration (Patch pits, final seeding and remove ESC measures) DPWandYOU.com | Making a difference, together
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 DPWandYOU.com | Making a difference, together
Recommend
More recommend
