HomeMy WebLinkAboutSHGWL Letter - 04 03 2019 1091 Stoneridge Drive • Bozeman, Montana • Phone (406) 587-1115 • Fax (406) 587-9768
www.chengineers.com • E-Mail: info@chengineers.com
Civil/Structural Engineering and Surveying
April 4, 2019
Griffin Nielsen, E.I.
City of Bozeman
Engineering Department
20 E. Olive Street
Bozeman, MT 59718
RE: Westland Lofts Mixed Use MASP/CUP AND Site Plan Seasonal High Groundwater
Levels (COB #18-557, 18-558);
Dear Griffin,
This letter is to provide a response to the request for seasonal high groundwater level (SHGWL)
monitoring for the above referenced project.
Eighteen monitoring wells were installed throughout the Baxter Meadows P.U.D. project as part
of the subdivision’s preliminary plat application. Groundwater levels were monitored from May
2000 to August 2001. The monitoring well in the Phase 6 portion of the site (MW-36) showed
ground water depths ranging 4.4 feet to 8.3 feet below ground surface (bgs) over the one-year
period. Sections from the preliminary plat application, well readings, and well locations are
included with this letter. In June 2018 a subsurface soils investigation was done on the site. Seven
test pits were dug on the lot; groundwater was encountered at 4.1 to 6.0 feet bgs. This is consistent
with the levels encountered in the preliminary plat application. The test pits were dug outside of
the seasonal high levels, therefore groundwater levels through the site could vary slightly from
what was observed with the test pits.
The development is proposing two underground retention systems. The chambers located in the
SE corner of the lot (Drainage Area 1 System) have a bottom elevation of 4697.7’, the existing
grade at this location is 4700.4’. The chambers located in the northern parking row (Drainage Area
2 System) have a bottom elevation of 4694.8’, the existing grade at this location is 4697.5. Based
on this information, the underground retention chambers will not be affected by the groundwater
levels.
If you have any questions or need any more information please give us a call at 406.587.1115.
Thank You, Reviewed By:
Drew Cater, E.I.
Matt Hausauer, P.E.
Civil/Structural Engineering and Surveying
Appendix A
Preliminary Plat Supplemental Information
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