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NPL Site Narrative for North Penn - Area 5

Montgomery Township, Pennsylvania

Federal Register Notice:  March 31, 1989

Conditions at proposal (January 22, 1987): The North Penn-Area 5 Site is in Montgomery Township, Montgomery County, Pennsylvania. The site was originally proposed under the name "American Electronics Laboratories, Inc."

The site has been renamed because the contamination may be caused by sources in addition to that identified in the original name. This is one of several NPL sites involving North Penn Water Authority (NPWA) wells that supply drinking water to most of the people living northwest of Philadelphia. Six additional areas with contaminated ground water are under investigation.

American Electronics Laboratories, Inc. (AEL) manufactures electronic communication equipment and components on a 200-acre site in Montgomery Township. Trichloroethylene (TCE) has been used at the facility.

The Pennsylvania Department of Environmental Resources (PA DER)and AEL have detected TCE, 1,1,1-trichloroethane, tetrachloroethylene, and related breakdown products in on-site and off-site wells. Soils on the site also contain TCE (up to 50,000 parts per billion). An estimated 106,000 people use public and private wells within 3 miles of the facility as their source of drinking water. A public well is within 50 feet of the site.

AEL has removed 125 cubic yards of contaminated soil and transported it to an EPA-regulated hazardous waste facility. In 1981, AEL began treating contaminated ground water by pumping on-site monitoring wells and treating the water at a nearby sewage treatment plant. In early 1986, AEL installed an air stripper unit on-site to treat contaminated ground water.

Status (March 31, 1989): EPA is developing a workplan for a remedial investigation/feasibility study (RI/FS) to determine the type and extent of contamination in the area and identify alternatives for remedial action. As a detailed workplan is developed, the sources responsible for the contamination will be given an opportunity to conduct the RI/FS.

EPA is evaluating additional sources of contamination.

For more information about the hazardous substances identified in this narrative summary, including general information regarding the effects of exposure to these substances on human health, please see the Agency for Toxic Substances and Disease Registry (ATSDR) ToxFAQs. ATSDR ToxFAQs can be found on the Internet at ATSDR - ToxFAQs (http://www.atsdr.cdc.gov/toxfaqs/index.asp) or by telephone at 1-888-42-ATSDR or 1-888-422-8737.

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