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«Prepared for MAWSS PWSID: AL0001005 May 2016 CH2M HILL Engineers, Inc. 25 W. Cedar Street Suite 560 Pensacola, FL 32502 Contents Section Page ...»

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4.2 Service Laterals The majority of lead and copper leaching occurs within the service lines and the private plumbing inside the residence. MAWSS began addressing corrosion of materials within water mains, services, and internal plumbing by using a corrosion inhibitor in the water treatment process. The corrosion inhibitor was first used in the mid-to-late 1980’s, prior to the promulgation of the Lead and Copper Rule in 1992.

Orthophosphates are used to change the corrosivity of the water and coat the inner wall of the pipes to reduce corrosion.

The materials used in the distribution system service lines for conveying water to the meters are as

follows:

 Copper pipe or tubing  Polyethylene pipe or tubing  High Density Polyethylene pipe or tubing  Galvanized pipe with lead connection (known as “gooseneck”) at the main  Copper pipe with lead connection (known as “gooseneck”) at the main  Galvanized pipe with copper connection at the main  Ductile Iron (larger meters)  Cast Iron (larger meters) As a result of interviews with present and retired MAWSS personnel, the above list is considered to be a complete list of all service materials in the MAWSS distribution system. Lead services extending from the main to the meter have not been encountered by repair personnel or identified in any known documentation of the distribution system. MAWSS does not know the length of each of the above materials in the distribution system.

About ten to fifteen lead pigtails, a/k/a goosenecks, that connect the service line to the main are discovered each year when excavated to repair leaks. The goosenecks generally exist under the road pavement at the location of the main. When goosenecks are encountered, the entire service is replaced from the main to the meter unless the service line is made of copper that is in good condition, in which only the gooseneck is replaced. Goosenecks are also removed when projects that include water main replacement are constructed.

–  –  –

4.3 Private Plumbing Materials The Board of Water and Sewer Commissioners has no jurisdiction over private plumbing materials in the MAWSS service area. Consequently, MAWSS requested databases of plumbing materials in buildings from both the City of Mobile Plumbing Inspection Department and the Mobile County Public Health Department. However, both departments responded that they do not keep such records.

4.4 Water Meters MAWSS currently has 91,799 water meters in its service area. Table 4-2 provides a breakdown of the systems water meters which have been newly installed or have been replaced since January 2014.

–  –  –

4.5 Future Material Inventory Program MAWSS is implementing a program to further populate the GIS with material inventories. To verify that materials are recorded, MAWSS’ computer maintenance management system has been modified to require material input before work orders can be closed out. Table 4-3 provides a list of work order jobs requiring materials input and their descriptions. This data is collected by the GIS Department where the materials in the GIS database are either confirmed, corrected, or changed from “Unknown” to the material identified in the field. The GIS Department is also reviewing project record drawings, forcemain reports, subdivision ages, and any other documents thought to contain additional material information.

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1. DO NOT LET TAP RUN BEFORE FILLING. The container needs to be filled up with water first thing in the morning, or after the water has NOT been used for at least (6) six hours. Fill the container all the way to the top. The samples must be taken from the bathroom or kitchen taps that is used frequently, not from tap rarely used. This sample must be taken, however, prior to any use of the water, such as flushing of the toilet, or running the tap.

2. Fill out the paper work that is with the container. You must sign and date the Chain of Custody provided and include date and time sample collected.

3. Place the container and the paper work inside the plastic bag (supplied) and sit on front porch. A Mobile Area Water & Sewer Service representative will come by to collect the sample.

Your assistance and cooperation in this testing program is greatly appreciated.

–  –  –

As a means of keeping our customers informed about the drinking water the Board of Water and Sewer Commissions d/b/a Mobile Area Water and Sewer System provides, we are pleased to provide the results of our recent lead and copper compliance sampling.

The regulations for lead and copper became effective in 1992. Between 1993 and 1995, the U.S. Environmental Protection Agency (EPA) required MAWSS and other water suppliers to collect water samples from household taps twice a year and analyze them to determine if lead is present in the water at levels above 15 parts per billion (ppb) or copper is present above 1.3 parts per million (ppm) in more than 10 percent of all homes tested. If lead and copper were present above these levels, MAWSS would be required to start monitoring for these contaminants twice a year. Once a water system demonstrates maintaining lead and copper levels below the Action Level and maintained the ranges, the Alabama Department of Environmental Management granted reduced monitoring schedules of once every year.





In the following table are the lead and copper results from the [YEAR] compliance monitoring of the Mobile Area Water and Sewer System distribution system.

SAMPLE DATE LOCATION LEAD RESULTS COPPER RESULTS

(physical address) Action Level 15 ppb Action Level 1.3 ppm

Definitions:

 Action Level or AL - The concentration of a contaminant that triggers treatment or other requirement a water system shall follow.

 Maximum Contaminant Level Goal or MCLG - The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLG allow for a margin of safety  Parts per million (ppm) or milligrams per liter (mg/L) - one part per million corresponds to one minute in 2 years or a single penny in $10,000.

Lead or Copper in Your Drinking Water Lead and copper are metals found in natural deposits as ores containing other elements. They are sometimes used in household plumbing materials or in water service lines used to bring water from the main to the home.

Why are Lead and Copper Being Regulated?

In 1974, Congress passed the Safe Drinking Water Act. This law requires EPA to determine safe levels of chemicals in drinking water which do or may cause health problems. These non-enforceable levels, based solely on possible health risks and exposure, are called Maximum Contaminant Level Goals. The MCLG for lead has been set at 0 ppm and the MCLG for copper has been set at 1.3 ppm because EPA believes this level of protection would not cause any of the potential health problems.

Appendix D Lead Violation Notification

MOBILE AREA WATER AND SEWER SYSTEMS

HAS LEVELS OF LEAD ABOVE DRINKING WATER STANDARDS

Our water system recently violated a drinking water standard. Although this is not an emergency, as our customers, you have a right to know that happened, what you should do, and what we are doing to correct this situation.

We routinely monitor for the presence of drinking water contaminants. Testing results we received on [date] show that our system exceeded the standard or Action Level (AL), for lead. The standard for lead is 0.015 milligrams per liter (mg/L) or 15 parts per billion (ppb). The average level for lead over the past year was [level] mg/l.

This is not an immediate risk. If it had been, you would have been notified immediately. However, some people who drink water containing lead in excess of the mcl over many years may have an increased risk of sickness, and neurological and physical development could potentially be affected.

However, if you have specific health concerns, consult your doctor.

Please share this information with all the other people who drink this water, especially those who may not have received this notice directly (for example, people in apartments, nursing homes, schools, and businesses). You can do this by posting this notice in a public place or distributing copies by hand or mail.

Should you have any questions concerning this violation or monitoring requirements, please contact:

–  –  –

Our water system recently violated a drinking water standard. Although this is not an emergency, as our customers, you have a right to know that happened, what you should do, and what we are doing to correct this situation.

We routinely monitor for the presence of drinking water contaminants. Testing results we received on [date] show that our system exceeded the standard or Action Level (AL), for copper. The standard for copper is 1.30 milligrams per liter (mg/L) or 1.3 parts per million (ppm). The average level for copper over the past year was [level] mg/l.

This is not an immediate risk. If it had been, you would have been notified immediately. However, some people who drink water containing copper in excess of the mcl over many years may experience problems with their liver, kidneys, or central nervous system, and may have an increased risk of sickness, nausea, vomiting, and diarrhea. However, if you have specific health concerns, consult your doctor.

Please share this information with all the other people who drink this water, especially those who may not have received this notice directly (for example, people in apartments, nursing homes, schools, and businesses). You can do this by posting this notice in a public place or distributing copies by hand or mail.

Should you have any questions concerning this violation or monitoring requirements, please contact:

Hector Castro MAWSS Water and Sewer Engineering Manager 251-694-3191

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