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HomeMy WebLinkAbout18 - Design Report - The Crossing at Baxter Meadows Ph 4G & 4H - Water, Sewer, Pavement, Storm 2304 N. 7TH AVENUE | SUITE L | BOZEMAN, MT 59715 | (406) 587-2781 Professional Consulting Engineers and Land Surveyors Equal Opportunity Employer | www.hyaliteeng.com July 25, 2018 City of Bozeman Engineering Department 20 East Olive Street, 1st Floor Bozeman, MT 59715 Attn: Griffin Nielsen, EI Review Engineer RE: Phase 4G & 4H of The Crossing at Baxter Meadows Subdivision Bozeman, Montana Design Report Update Memo Dear Griffin: The entirety of Phases 4G & 4H of The Crossing at Baxter Meadows have previously been designed and presented in the 2013 TD&H “Engineering Design Report The Crossing at Baxter Meadows” for Phases 4B-4I, however a few of the items needed to be restated and/or clarified specific to Phases 4G & 4H. Purpose & Introduction Phases 4G & 4H of The Crossing are located directly south-west of Phase 4F, which was constructed in 2016-2017. Phase 4G consists of the same preliminary platted 9 lots, while 4H consist of the same 5 lots, as seen on the included preliminary plat (see section 6). Water The proposed water infrastructure essentially remains the same as in the original 2013 Design Report, therefore the water model remains valid. The water system will tie into existing stubs located at all 3 points; just south of Lolo/Vaquero intersection, the dead end stub located in Tschache Lane, as well as the stub located just west of Fire Station #3. All water mains will be continued at 8”Ø, as will the stub outs for future connection. Sewer The proposed sewer infrastructure remains the same as in the original 2013 Design Report, therefore the estimated flow and pipe calculations remain valid. The sewer system will tie into existing stubs located at 2 points; just south of Lolo/Vaquero intersection, as well as the stub located in Tschache Lane. All sewer mains will be continued at 8”Ø, as will the stub outs for future connection. Pavement Design The proposed road infrastructure remains the same as in the original 2013 Design Report, therefore the proposed sections will be utilized. Letter to City of Bozeman Engineering Department Re: Phase 4G & 4H of The Crossing at Baxter Meadows Subdivision Design Report Update Memo July 25, 2018 Page 2 of 2 L:\172708\Engineering Reports\Crossing 4G & 4H- CoBoz Design Report 07252018.docx Stormwater The proposed storm basins have essentially remained the same as in the original 2013 Design Report. Updated information has been provided in the included Storm Report regarding the updated layout of storm water infrastructure, repositioning of storm ponds, as well as the RCP arch culverts under Vaquero Parkway. Floodplain The culverts under Vaquero Parkway were sized the same as previously modeled in the 2007 Floodplain Analysis by TD&H (as referenced in the 2013 Design Report) and therefore the floodplain is the same as modeled at that time. I hope that the enclosed information allows you to approve this submittal. If for any reason you have any questions or need any additional information during the review of this project please feel free to give me a call at 587-2781 or send an email to bmegaard@hyaliteeng.com. Sincerely, Brett Megaard, PE Project Engineer Cc: File – 172708 Owner