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D.

Lead

Source – Previous ground water studies in New Jersey carried out by NJGS (private communication, Mike Serfes, 2007), the Site Remediation Program and USGS have determined that lead is seldom found in ground water samples in New Jersey. The source of lead in drinking water is almost always from the plumbing inside the home. Counties that Sampled – All counties were required to sample for lead. Sampling – The sampling protocol for PWTA sample collection includes flushing the house system for at least two minutes (preferably 5 or 10 minutes) and collecting the water sample at the tap where the flushing occurred Standard – There is no MCL for lead ,however an Action Level of 15 ug/L is used to evaluate the water left standing in the plumbing for a prolonged period of time. The PWTA Program is using the NJDEP Ground Water Quality Standard to

evaluate water quality.

When

10 µg/l.

On November

7,

the program began the ground water standard was 2005, the Ground Water Quality Standard was

changed to 5 µg/l.

Lead samples in homes – A

total of 5,523 (11%) of the homes had lead levels

above the previous Ground increased to 9,368 (18%) of Water Quality Standard of 5 in their plumbing systems, ground water supply.

Water Quality Standard of 10 µg/l. This number homes that had lead levels above the new Ground µg/l. This indicates that many homes still have lead since it is unlikely that it originated from the raw

  • 3.

    Gross Alpha Particle Activity

    • Source - Erosion of natural deposits of certain minerals that are radioactive may emit a form of radiation known as alpha radiation. The alpha radiation is emitted from both short-lived and long-lived radionuclides. In the Southern part of the state, it is probably the decay of radium and its isomers that results in the alpha radiation, while in the northern counties uranium may be implicated.

    • Counties that Sampled:

      • 1.

        Cumberland and Gloucester Counties - Sampling was required beginning on March 15, 2003.

      • 2.

        Atlantic, Burlington, Camden, and Salem Counties - Sampling was required beginning on September 16, 2003.

      • 3.

        Cape May, Hunterdon, Mercer, Middlesex, Monmouth, and Ocean - Sampling was required beginning on March 16, 2004.

    • Testing Requirements and MCL - The gross alpha test involves two readings. The first test is done within 24 hours of sampling. If the sample contains more than 5 pCi/l, a second test is carried out within 48 hours. If the value of the second test is greater than 15 picoCuries per liter (pCi/l), the sample exceeded the MCL

    • Number of Wells over the MCL – 2,209 wells out of 22,904 wells tested for gross alpha particle activity or 9.6% had concentration above the MCL. These data are presented by county in Appendix I.

18

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