HomeMy WebLinkAbout023_BozemanSolventSiteDEQResponseEmailFrom:Fry, Kate
To:Chris Naumann
Cc:Jim Sullivan; DEQ QuickReq
Subject:RE: Bozeman Solvent Site - North Park (fka Mandeville Farm)
Date:Monday, March 18, 2024 8:40:15 AM
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Hi Chris,Thank you for reaching out about the Bozeman Solvent Site. The North Park (fka Mandeville Farm)project you describe in your email below is within the Bozeman Solvent Site. The main contaminantof concern for the Bozeman Solvent Site is tetrachloroethene (PCE). Groundwater flow is from the
south to the north. The closest Bozeman Solvent Site monitoring well to the project location shown
provided is M-37. M-37 is located near the northwest corner of Tract 2-B on the east side of
Mandeville Creek. M-37 is sampled annually in June as part of the Bozeman Solvent Site. Below isa table summarizing PCE concentrations in M-37 since 2017:
M-37
June 2017 4.6 µg/L
June 2018 4.2 µg/L
June 2019 4.1 µg/L
June 2020 <0.5 µg/L
June 2021 3.6 µg/L
June 2022 <0.5 µg/L
June 2023 2.3 µg/L
In August 2011, the Montana Department of Environmental Quality issued the Record of Decision
(ROD) 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 µg/L. The ROD identified the final cleanupremedy for this portion of the Bozeman Solvent Site as monitored natural attenuation (MNA). M-37 ispart of the MNA monitoring program. As you can see, the PCE concentrations in M-37 are below theSSCL.
The ROD does not identify construction requirements related to the Bozeman Solvent Site in this
area. However, construction may require a dewatering permit. The depth to groundwater in M-37 is
less than 10 ft. I believe the Construction Dewatering General Permit (CDGP) application requiresthe applicant to contact me regarding current groundwater plume conditions. This email may satisfythat requirement. Please note, the CDGP may have different requirements for PCE concentrationsthan the Bozeman Solvent Site SSCL prior to discharge under a CDGP.
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 contactDNRC 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 | Senior Project Officer
Superfund, AML, and Construction Bureau
Waste Management and Remediation Division
Montana Department of Environmental Quality
Office: 406-444-6426
From: Chris Naumann <cnaumann@sandersonstewart.com>
Sent: Monday, March 11, 2024 4:27 PM
To: Fry, Kate <kfry@mt.gov>; info@tasman-geo.com
Cc: Bobby Egeberg <begeberg@sandersonstewart.com>
Subject: [EXTERNAL] Bozeman Solvent Site
Good afternoon, Kate and Jim.
Per the City of Bozeman’s request, we are reaching out about a public infrastructure Master Site Plan (MSP)
application within the Bozeman Solvent Site boundary.
The project is located within the North Park (fka Mandeville Farm) property. The infrastructure application
includes schematic (2D) design for proposed streets, water, sewer, and stormwater infrastructure. Attached
is the most recent MSP submittal to the City of Bozeman.
We anticipate moving into Construction Documents this summer.
Please provide any required design guidelines and let us know if you would like to schedule a call to discuss
this project. Thanks.
Chris Naumann
Associate | Bozeman Branch Manager
(he/him)
t: 406-922-4311
m: 406-570-5758
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