Site Number: |
B4Y1 |
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Contract Number: |
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D.O. Number: |
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Action Memo Date: |
4/20/2016 |
Response Authority: |
CERCLA |
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Response Type: |
Time-Critical |
Response Lead: |
EPA |
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Incident Category: |
Removal Action |
NPL Status: |
Non NPL |
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Operable Unit: |
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Mobilization Date: |
12/7/2012 |
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Start Date: |
12/7/2012 |
Demob Date: |
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Completion Date: |
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CERCLIS ID: |
NCN000410936 |
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RCRIS ID: |
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ERNS No.: |
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State Notification: |
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FPN#: |
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Reimbursable Account #: |
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1.1.1 Incident Category
Time Critical Removal Action
1.1.2 Site Description
The Site is a
residential neighborhood that has several private residential drinking water
wells that have been contaminated with pesticides and chlorinated solvents;
chlordane, dieldrin, heptachlor epoxide and tetrachloroethylene (PCE). There are no known sources of the
contamination at this time. The Bond Street Contaminated Well Site
neighborhood is in close proximity to the intersection of Trawick Road and Bond
Street. This
area is not in the City of Raleigh city limits. It is considered a "Donut
Hole" where the city has grown around this neighborhood and not annexed
this area; thus waterlines has not been extended to this neighborhood.
1.1.2.1 Location
Bond
Street Contaminated Well Site, Raleigh, Wake County, North Carolina. The Bond
Street Contaminated Well Site neighborhood is in close proximity to the
intersection of Trawick Road and Bond Street. This
area is not in the City of Raleigh city limits. It is considered a "Donut
Hole" where the city has grown around this neighborhood and not annexed
this area; thus waterlines have not been extended to this neighborhood. The Source
of the contamination is unknown.
1.1.2.2 Description of Threat
There is documented evidence of drinking water
wells that have been impacted at the Site with concentrations of chlordane,
dieldrin, heptachlor epoxide and PCE that exceed RMLs and/or MCLs.
1.1.3 Preliminary Removal Assessment/Removal Site Inspection Results
In December, 2012 the U.S. Environmental Protection Agency Region 4, Superfund Division, Emergency Response, Removal and Prevention Branch received a request from the Wake County Environmental Services program, to conduct a Removal Site Evaluation (RSE) at the Bond Street Contaminated Well Site. Wake County discovered chlordane and dieldrin at the Bond Street Contaminated Well Site in residential wells that exceed the Removal Management Levels (RML's).
U.S. EPA received access agreements and initiated residential well sampling in Bond Street Contaminated Well Site community in Raleigh, NC in December, 2012. The Removal Management Level (RML) for chlordane is 3.8 ug/L, dieldrin is 0.17 ug/L and heptachlor epoxide is 0.14 ug/L. The Maximum Contaminant Level (MCL) for chlordane is 2.00 ug/L, dieldrin does not have a MCL and the MCL for heptachlor epoxide is 0.2 ug/L. During the Removal Site Evaluation in December of 2012, EPA sampled twelve wells; three wells exceeded the RML for dieldrin (0.382 ug/L, 0.179 ug/L, and 0.6 ug/L). One well exceeded the RML for heptachlor epoxide, 0.18 ug/L and one well exceeded the MCL for chlordane, 3.06 ug/L. In summary, five well samples exceeded a RML or MCL. Upon completing the RSE, which involved interviewing residents, assessing the location of the wells in relation to the foundation of the homes, reviewing data and considering the time of construction of both the homes and the wells (constructed in 1960s), EPA concluded that the contamination was likely introduced by the homeowners themselves or by the builder via termite treatment; thus did not conduct a removal action in 2012 based on the evidence supporting contamination present as a result of proper pesticide application. Residents were provided with the EPA sampling results and appropriate recommendations were provided with these results. The Site was then referred back to the North Carolina Department of Natural Resources (DENR) Aquifer Protection Section (APS) and Wake County Environmental Services.
North Carolina DENR (now DEQ) collected additional samples and provided either filters or public water connections to four homes that met the criteria for assistance using Bernard Allen Drinking Water Fund; a program that provides assistance to low-income households needing assistance to deal with contaminated groundwater. Several households did not meet the criteria for assistance from the Bernard Allen Drinking Water Fund.
In February of 2016 EPA discussed re-evaluating the Site as a potential time-critical removal canidate based on new information provided by Wake County Environmental Services. A home and residential well that was constructed in 2003, sampled by NC DENR had dieldrin concentrations documented at 0.04 ug/L and tetrachloroethylene (PCE) at 0.54 ug/L; the neighboring property has a concentration of 4.9 ug/L PCE, right at the MCL of 5 ug/L.
There are currently five homes that exceed the RML/MCL that have not been provided a municipal connection or a filtration system. There are approximately 273 homes in the “Donut Hole” in the vicinity of the Bond Street neighborhood; 133 homes in the Donut Hole have not yet been sampled due to lack of property access that need to be assessed. After a review of Site conditions, the Emergency Response, Removal and Prevention Branch (ERRPB) concluded that the Site meets the criteria as set forth in 40 CFR 300.415(b)(2) for a time-critical removal action.
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