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2.1.1 Narrative
Marathon submitted to USEPA, DEQ, and the City of Detroit a plan to assess the area potentially impacted by its wastewater discharge. The plan discussed the process of interviewing residents, air monitoring, air sampling, sewer trap inspections, and outdoor air sampling (see Workplan under documents).
The agencies and Marathon identified 62 homes for investigation. Of those 62, 42 completed inspection, 12 refused access, and 8** did not responded to multiple flyers and home visits. Of the 42 completed, 1* had a non-functioning trap, 5 had plugged or sealed drains.
*Early in the investigation USEPA identified a home on Liebold Street with a failed sewer trap. The owner later denied access to Marathon to investigate and fix the trap.
**A mailer was sent to the 8 residents who had not responded asking them to respond by March 16. While the resident hotline will remain open for an additional month, no further outreach is planned.
The second part of the work plan is an evaluation of the potential effects of Marathon's wastewater discharge on sewer gas venting to ambient air from manholes in residential neighborhood located near Pleasant, Liebold, and Liddesdale Avenue (ambient air sampling). The first round of samples were collected on March 25. Sampling will continue for one year.
2.1.3 Enforcement Activities, Identity of Potentially Responsible Parties (PRPs)
Marathon is performing the assessment and response work voluntarily.
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