OSWER/OSRTI Washington, DC 20460 

## N ATIONAL 

## P RIORITIES 

## L IST 

## (NPL) ***Final Site*** Septe mb e r 2014 

### BAGHURST DRIVE Harleysville, Pennsylvania

Montgomery County  Site Lo cation: The si te is lo ca ted in a rural, residentia l area in Southeastern Pennsylvania about 35 miles northwest of Philadelphia.

 Site Hi

st or y: The sit e consists of a ground water plume contaminated with volatile organi c compounds (VOCs). The sourc e of the VO Cs is unknown. In 1999, the Montgomer y Coun ty H ea lth Department (MCHD) discovered the plume wh en th e y sa mp led r esidential wells in the area. The Pennsy lv ania Department of Environmental Prot ec t ion (PADEP) immedi a te ly began supplying 27 residen ce s with bottled drinking water and subsequentl y equipped the homes with
carbon filtration systems. PAD EP conducted an investigation to identify the source of the contamination but were
un able to p rod uce definitive documentation regarding the so ur ce. The si te h as contaminated 27 residential d rinking water well s, including a common we ll and is also affecting an additional 13 -15 residential wells that have tr ace a mounts of contaminants.
 Site Contamination/Contaminants: The plume is approximately 2,500 fe e t lo ng and 750 feet wide and is contaminated with VOCs: 1,1,1-trichloroethane (1,1,1-TCA), 1,1-dic h loroethene (1,1-DCE), trichloroethyl e ne (TCE), vinyl chloride and 1,4-dioxane. The carbon filtration syste ms are not effectively filtering out the 1,4-dioxane and the refor e the PAD EP is also providing residents whose wells have concen tr ations of 1,4-dioxane ex cee ding the state ac tion leve ls with bottled w a te r.
 Potential Im

p ac ts on Surrounding Community/Environment: The si te is known to h av e contaminated 27 residential d rinking water well s, including a common we ll whi ch se rv es 10 residences. Th e re are also an additional 13-15 re sidential wells th at h ave tr ace amounts of contaminants. Althoug h ground water is the p rin cipal reason for li st ing, there also ma y be v apor in trusion is su es since these houses
are ov erlying a contaminated ground water plume.  R es pon se Activities (t

o date): The EPA h as pe rfo rmed no response ac tions at th is si t e. PAD EP has p rovided aff ec ted residen ce s with carbon filtr ation systems and/or bottled wa te r.
 Ne ed for NPL Listi

ng: The PAD EP referred the si te to the EPA b eca u se the plume is affecti ng ma ny residen ce s and the carbon filtr ation systems a re not effectiv e ly filtering out a ll contaminants. A pe rm anent altern ative water supply is ne ce ssa ry a lo ng with the remediation of the underlying plume. Other c le a nup alte rn ativ es were ev aluated, but a re not viable at th is time b eca use a pe rm an ent al te rn ate source of d rinking water is not re adily av ailable. The EPA r ece i ved a letter of support for placing th is site on the NPL from the commonw ea lth of Pennsylvania.

[The description of the site (release) is based on information available at the time the site was evaluated with the HRS. The description may change as additional information is gathered on the sources and extent of contamination. See 56 FR 5600, February 11, 1991, or subsequent FR notices.]
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 http://www.atsdr.cdc.gov/toxfaqs/index.asp or by telephone at 1-888- 42 -ATSDR or 1- 888 -422-8737.