HomeMy WebLinkAboutCorrespondence - Development Project within Solvent Site f0iG m a i I Juliene Sinclair<jsinclair@alpinesurveying.net>
Development Project within Solvent Site
Fry, Kate<kfry@mt.gov> Thu, Dec 5, 2024 at 2:33 PM
To: Juliene Sinclair<jsinclair@alpinesurveying.net>
Hi Juliene,
Thank you for reaching out about the Bozeman Solvent Site. The project you describe in your email (i.e., GARDNER SIMMENTAL PLAZA, S35, T01 S, R05 E, Lot
2,ACRES 3.208, TRACT 1 J-5-E) is within the Bozeman Solvent Site. In August 2011, the Montana Department of Environmental Quality issued the Record of
Decision (ROD)for the Bozeman Solvent Site. Tetrachloroethene (PCE) is the main contaminant of concern for the Bozeman Solvent Site. The ROD identified that
the Bozeman Solvent Site site-specific clean up level (SSCL)for PCE in groundwater is 5 pg/L.
There are no Bozeman Solvent Site groundwater monitoring wells on the project property or within 2000 ft. Based on historical groundwater data, groundwater flow
across the Bozeman Solvent Site is from the south to the north and the depth to groundwater at the project location is likely around 10 feet below ground surface.
Based on historical groundwater data, PCE concentrations may be present in the groundwater, but concentrations are expected to be less than the SSCL of 5 Ng/L.
The ROD does not identify construction requirements related to the Bozeman Solvent Site in the area of your project. However, if construction activities require a
dewatering permit, the Construction Dewatering General Permit(CDGP) application requires the applicant to contact me regarding current groundwater plume
conditions. This email may satisfy that requirement. Please note, the CDGP may have different requirements for PCE concentrations than the Bozeman Solvent
Site SSCL prior to discharge under a CDGP. For addition information on the CDGP application process please contact Christine Weaver in DEQ Water Quality
(406-444-3927 or CWeaver@mt.gov).
In addition, your project is within the Bozeman Solvent Site Controlled Groundwater Area (CGWA). The CGWA is administered by the Montana Department of
Natural Resources and Conservation (DNRC). The CGWA limits the type of groundwater wells that can be installed. Please contact DNRC for more information.
This email only addresses concerns related to the Bozeman Solvent Site.
Please let me know if you have questions.
Regards,
Kate
Kate Fry I Senior Project Officer
Superfund,AML, and Construction Bureau
Waste Management and Remediation Division
Montana Department of Environmental Quality
Office: 406-444-6426
DE '-' Montana Department of
Environmental Quality
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