The URL can be used to link to this page

Home My WebLink About044.02 Environmental comment responses July 2025 TO: SRX-II Subdivision File FROM: Christine Pearcy, Environmental Scientist; Faith Doty, PWS DATE: July 16, 2025 JOB NO.: 5659.021 RE: Response to City of Bozeman (COB) Wetland Review Comments received from Naiad Aquatic Consultants on July 2, 2025 Regarding SRX-II Pre-Plat Submittal. CC: Matt Ekstrom, PE; Celine Saucier, PE; Parker Lange Urgent For Review Please Comment Please Reply For Your Use Objective The following is a summary of the comments provided by Dr. William Kleindl with Naiad Aquatic Consultants regarding the pre-plat application for South Range Crossing II (SRX-II) with our accompanying response(s). Comments & Response(s) A. Comment: Mitigation will consist of credits purchased at the federally approved bank; however, impacts to buffers onsite are not accounted for (see note below). a. Response: Sec. 38.610.020 D: “It is not the intent of this division 38.610 to prohibit all activities within regulated areas and associated buffers, but rather to encourage the avoidance of regulated activities within the regulated areas and to require best management practices in regulated areas” The wetland impact exhibit depicts impacts to buffer areas in 2 locations: Buffer 1 Impacts: North 17th and Staudaher and Buffer 2 Impacts: Staudaher. Buffers are upland communities adjacent to the wetlands. Impacts to these buffer areas were unavoidable due to the necessary connections to existing roadway alignments, as required by the City of Bozeman. To compensate for impacts to onsite buffers, soil stockpiles will be removed from the restricted lot and native grass species will be planted. B. Comment: There needs to be additional comments on how design will reduce impacts on the hydroperiod. See comments below. Response: Groundwater levels beneath the proposed subdivision experience seasonal variations but are generally relatively high. The groundwater levels onsite range between approximately 1 and 5 feet below existing grade based on groundwater monitoring performed from May 2023 to September of 2023 and was highest during the spring runoff season. Storm treatment structures for the subdivision were designed with bottom elevations above the seasonal high ground water level to ensure they will drain as required, thus, continuing to contribute to on-site hydrology. The proposed roadway designs for South 17th Avenue and Staudaher Street have been developed with specific attention to preserve the existing shallow groundwater dynamics and ensuring continued hydrologic connectivity to the remaining wetland areas on site. To address this, the roadway base sections will incorporate pervious fill materials similar to those used on West Graf Street, which has proven effective in maintaining shallow subsurface flow paths and minimizing change to the hydroperiod. C. Comment: [Need] a discussion of ongoing management practices that will protect and maintain the nonimpacted and mitigation wetland, watercourse and buffer areas in perpetuity. a) Response: This is a requirement for a compensatory mitigation plan. Mitigation of these jurisdictional wetlands is managed via off-site purchase of wetland bank credits, as required by the U.S. Army Corps of Engineers (USACE). After fill and mitigation, there are no remaining wetlands within this Pre-Plat Submittal area. All other wetlands remaining on the general property are not currently going through the Pre-Plat process. Those remaining parcels will go through a separate Pre-Plat process (cited: Sec. 38.220.130 – Submittal materials for regulated activities in wetlands 3.c.). As stated above, the proposed roadway designs for South 17th Avenue and Staudaher Street have been developed with specific attention to preserve the existing shallow groundwater dynamics and ensuring continued hydrologic connectivity to the remaining wetland areas on site. To address this, the roadway base sections will incorporate pervious fill materials similar to those used on West Graf Street, which has proven effective in maintaining shallow subsurface flow paths and minimizing change to the hydroperiod. Additionally, storm treatment structures for the subdivision were designed with bottom elevations above the seasonal high groundwater level to ensure they will drain as required, thus, continuing to contribute to on-site hydrology. During construction, fencing will be placed to exclude construction equipment from the restricted lot. Signage can also be placed stating that the area is a wetland and is not to be disturbed or filled. When/If the restricted lot goes through the Pre-Plat process, a separate wetland evaluation will take place at that time. D. Comment: I see the functional assessment, but not an evaluation of the impacts of these proposed activities. The joint application does not address the City’s needs. I do not see a clear description of the impact on functions and values. This is typically done by running the assessment in its current state, then again using the plan sheets of the design. The two scores are subtracted, and a table is generated showing the lost functions and values resulting from the proposed activity. a. Response: The following table presents the Pre-Development and Post-Development Functional Units using the Montana Department of Transportation Wetland Assessment Form. Pre-development units were documented for the entire 35-acre property. Post-development units were evaluated by taking into account the filling of 0.48 acre of wetland on the subject property. b. Function and Value Variables Pre-Development Functional Units Post-Development Functional Units Listed/Proposed T&E Species 3.5 3.5 MT Natural Heritage Program Species Habitat 21 21 General Wildlife Habitat 17 17 General Fish Habitat NA NA Flood Attenuation NA NA Short- and Long-Term Surface Water Storage 35 28 Sediment/Nutrient/Toxicant Removal 21 21 Sediment/Shoreline Stabilization NA NA Production Export/Food Chain Support 28 24.5 Groundwater Discharge/Recharge NA NA Uniqueness 7 7 Recreation 0 0 Total Units 132.5 122 Category of Wetland Category III wetland Category III wetland E. Comment: I do not see an evaluation of the extent and permanence of the adverse effects from these proposed activities. Although this may be in for Joint Application, the COB code has clear requirements outside of the Joint Application. It requires an evaluation of the extent and permanence of the adverse effects from these proposed activities. The phrase “extent and permanence” or “adverse impacts” does not appear in the Joint Application text. a. Response: The extent and permanence of the impacts from the project resulted in 0.48 acres of permanent fill within a jurisdictional PEM wetland and 0.01 acres of Middle Creek Stream Ditch. Wetland A will be reduced from 4.94 acres to 4.46 acres. As indicated in the functions and values assessment above, the wetland will remain a Category III wetland. Shallow groundwater flow will be maintained as indicated above. Extent: 0.48 acres of PEM wetland, and 0.01 acres Middle Creek Ditch/Stream Permanence: Permanent These adverse impacts will be mitigated through the purchase of wetland credits through the Upper Missouri Mitigation Bank. F. Comment: There is very shallow groundwater, and currently, stormwater from Graf. I do not see how these waters are managed following the construction of S. 17th and Staudaher. Application must provide details on design (e.g., permeable road fill) to ensure that the is continued connection of water supply to remaining wetland areas. a. Response: Sec. 38.610.010 – Title and Applicability: “The provisions contained in these regulations do not apply to wetlands created by a wholly manmade water source used for irrigation purposes of stormwater control”. The SRX-II Subdivision – Stormwater Design Report (attached) provides a basis of storm drain design for the SRX-II Subdivision project. The storm drain system serving SRX-II was designed and shall be installed in accordance with the following: i. The City of Bozeman Design Standards and Specifications Policy (dated May 1, 2017) and including Addendum Numbers 1 thru 6 ii. Montana Public Works Standards Specifications (MPWSS) – 6th Edition iii. The City of Bozeman Modifications to MPWSS Storm drains will convey stormwater to ponds as designated within the report. Stormwater generated by each lot will be treated on site with treatment ponds or underground storage chambers on site. Design of these systems are excluded from this application and will be completed during future site planning applications. Groundwater levels beneath the proposed subdivision experience seasonal variations but are generally relatively high. The groundwater levels onsite range between approximately 1 and 5 feet below existing grade based on groundwater monitoring performed from May 2023 to September of 2023, and was highest during the spring runoff season. Stormwater treatment structures for the subdivision were designed with bottom elevations above the seasonal high ground water level to ensure they will drain as required, thus, continuing to contribute to on-site hydrology. As stated above, the proposed roadway designs for South 17th Avenue and Staudaher Street have been developed with specific attention to preserve the existing shallow groundwater dynamics and ensuring continued hydrologic connectivity to the remaining wetland areas on site. To address this, the roadway base sections will incorporate pervious fill materials similar to those used on West Graf Street, which has proven effective in maintaining shallow subsurface flow paths and minimizing change to the hydroperiod. G. Comment: It appears that Phase 1 will fill all the wetland within the footprint of this phase. However, there are limited details on the extent and timing of potential impacts of Phase 2. Therefore, there should be a plan to maintain the remaining wetland in this area. The comment above refers to a plan to maintain the wetland functions for the remaining wetland until which time Phase II is implemented. a. Response: The extent and timing of potential impacts of Phase 2 are currently unknown. During construction, fencing will be placed to exclude construction equipment from the restricted lot. Signage can also be placed stating that the area is a wetland and is not to be disturbed or filled. When/if the restricted lot goes through the Pre-Plat process, a separate wetland evaluation will take place. H. Comment: See comment above on Phase II plans (referring to a deed restriction). a. Response: No Deed Restriction will be filed with the county clerk for Phase II plans. Phase II plans are unknown at this time, and impacts to wetlands in Phase II are not being reviewed or assessed. The City of Bozeman requires a Future Phases Phasing Exhibit, which is included in this submittal. All impacts from Phase II are hypothetical at this time. Any future impacts resulting from roadway and stormwater infrastructure will be designed in a similar manner as Phase I so as to maintain the integrity of the shallow aquifer. LOT 17.45 acs. LOT 16.84 acs. LOT 21.74 acs.8S8S8S8S8S18S18S18S18S18S18S18S18S18S18S18S18S18S10S 10S 10S 10S 8S 8S 8S8S8S8S8SSS S S S S S S S S SS S 8S8S8S8S8S8SS S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S S S 8S8S8S8S8S8S8S8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S S 70 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 24W24W24W24W24W24W24W24W24W24W8W8W8W8W8W8W8W8W8W8W8W8W8W 8W8WDYH DYHDYH DYHDYHDYH8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8WWSFIRE FIREWS WS FIRE FIRE WS WS WSDYHWSWSWSSDSDSDSDSDSD D D D D D SD SD SD SD SDD SDSDSDSDSDSDSDSDSDSDSDSDSDDSDDSDSDD D SD©COPYRIGHT MORRISON-MAIERLE, INC.,2025 PLOTTED DATE: Apr/08/2025 PLOTTED BY: celinesaucier DRAWING NAME: N:\5659\021 - SWX North Pre-Plat\ACAD\Survey\PRE-PLAT\5659.021 Pre Plat - DRAFT.dwg 1/4 SEC. SECTION TOWNSHIP RANGE PROJ. #:SHEET OF COUNTY,DATE: SCALE: CLIENT: FIELD WORK: DRAWN BY: CHECKED BY:31 GALLATIN 5659.021 1"=100' 08/14/2024 JW NM MMI 5 EAST 2 SOUTH 24NW MONTANA PRINCIPAL MERIDIAN, MONTANA SRX - II BEING LOTS 1,2,3, AND 4 OF BLOCK 1 OF MINOR SUBDIVISION No. 494 LOCATED IN THE NORTHWEST 1/4 OF SECTION 24, TOWNSHIP 2 SOUTH, RANGE 5 EAST, PRINCIPAL MERIDIAN, CITY OF BOZEMAN, GALLATIN COUNTY, MONTANA engineers surveyors planners scientists MorrisonMaierle2880 Technology Blvd WestBozeman, MT 59718 Phone: 406.587.0721 www.m-m.net 100 200501000 SCALE IN FEET PRELIMINARY PLAT OF OWNER SRX II LLC 1450 TWIN LAKES AVE STE 201 BOZEMAN MT, 59718 BASIS OF BEARING Bobcat Coordinate System, NAD83(2011) per the"Rocky Mountain Tribal Coordinate Reference System" Handbook and User Guide, Published September 30th, 2014 and subsequent revisions,established by observations with survey-grade GNSS receivers. ALL LOTS ARE SUBJECT TO THE FOLLOWING UTILITY EASEMENTS (EXCEPT THE RESTRICTED LOTS):- 10' ALONG PUBLIC RIGHTS-OF-WAY- 10' ALONG SIDE LOT LINES- 10' ALONG REAR LOT LINES PUBLIC UTILITY EASEMENTS (P.U.E.) LEGEND SET A REBAR 5/8" DIA.., WITH AN ORANGE PLASTIC CAP, "MMI16411LS". FOUND REBAR AS MARKED MID-SECTION CORNER PURPOSETO CREATE 3 LOTS, 1 RESTRICTED LOTAND DEDICATION OF PUBLIC RIGHTS-OF-WAY I, ________________, Director of Transportation and Engineering, City of Bozeman, Montana, do hereby accept the dedication to the City of Bozeman for the public use of any and all lands shown onthe plat as being dedicated to such use. Dated this __________ day of ____________________, 20____. ________________________________________Director of Transportation and EngineeringCity of Bozeman, Montana SRX -NORTH, Gallatin County, Montana, is within the City of Bozeman, Montana, a first classmunicipality, and with the planning area of the Bozeman growth policy which was adopted pursuant toSection 76-1-601 et seq., MCA, and can be provided with adequate storm water drainage andadequate municipal facilities. Therefore under the provisions of Section 76-4-125(1)(d), MCA, this survey is excluded from the requirement for Montana Department of Environmental Quality review. Dated this ________________________ day of _______________________________, 20____. ________________________________ MFE # _________________________ Director of Transportation and EngineeringCity of Bozeman, Montana CERTIFICATE OF EXCLUSION FROM MONTANA DEPARTMENT OF ENVIRONMENTAL QUALITY REVIEW CERTIFICATE OF ACCEPTANCE OF DEDICATIONS SRX II LLC By:_____________________________________________________________________________________________________, Authorized Representative Dated State of ____________________________________ County of ___________________________________ On this _______ day of __________________, 20____, before me, the undersigned Notary Public forthe State of _____________________ personally appeared __________________, known to me tobe the Authorized Representative of ___________________ and acknowledged to me that said _____________________ executed the same. Notary Public in and for the State of ___________________Printed Name _____________________________________Residing at _______________________________________ My commission expires _____________________________Signature ________________________________________ CERTIFICATE OF COMPLETION OF IMPROVEMENTS I, __________________ and I, ____Matt Ekstrom______, a Registered Professional Engineer licensed to practice in the State of Montana, hereby certify that the following improvements, required tomeet the requirements of Chapter 38 of the Bozeman Municipal Code or as Conditions of Approval ofthe Final Plat of SRX - NORTH have been installed in conformance with the approved plans and specifications, or financially guaranteed and covered by the improvements agreement accompanyingthis plat. Installed Improvements:1. Street Improvements2. Sewer and Water Improvements 3. Storm Water Improvements4. Roadway Lighting Improvements Financially Guaranteed Improvements: 1. Landscaping & Irrigation 2. Sidewalks The subdivider hereby warrants against defects in these improvements for a period of two years fromthe date of acceptance by the City of Bozeman.The subdivider grants possession of all public infrastructure improvements to the City of Bozeman andthe City hereby accepts possession of all public infrastructure improvements, subject to the aboveindicated warranty. ____________________________ ___________________________________________ Authorized Representative Dated SRX II LLC____________________________ ____________________________Matt E. Ekstrom, PE DatedMT Reg. No. 10853PEMorrison Maierle, Inc. _______________________________________ ____________________________Director of Transportation and EngineeringCity of Bozeman, Montana All streets, alleys, and right-of-way, shown hereon as "DEDICATED", are not easements. The intent ofdedication is to convey all the streets, alleys, and right-of-way to the public, upon acceptance by thegoverning authority, DEDICATION AND EASEMENT NOTE We, the undersigned mortgagees or encumbrancers do hereby join in and consent to the described plat, releasing ourrespective liens, claims, or encumbrances as to any portion of said lands now being platted into streets, avenues, parcels orother public areas which are dedicated to Gallatin County for the public use and enjoyment. Dated this _________________________ day of _________________________, 20___. ____________________________________________________________________________ By: __________________________ Authorized Signatory STATE OF MONTANA ) :ssCOUNTY OF GALLATIN ) This instrument was acknowledged before me on __________________, 20___, the undersigned Notary Public,personally appeared _____________________, known to me to be Authorized Signatory of Opportunity Bank ofMontana who signed the foregoing instrument and acknowledged to me that Opportunity Bank of Montana executedthe same. IN WITNESS WHEREOF, I have hereunto set my hand and seal the date first above written. ________________________________[signature] Notary Public for the State of Montana( S E A L ) ________________________________ [printed name] Residing at:________________, ___________ (City) (State) My commission expires:____________, 20___ We, the undersigned property owners, do hereby certify that we have caused to be surveyed,subdivided and platted into lots, blocks, streets, and alleys, and other divisions and dedications, asshown by the plat hereunto included the following described tract of land to wit: Lot 1,2,3, and 4 of Block 1 of Yellowstone Theological Institute Minor Subdivision Number 494, located in the NW1/4 of Section 24, Township 2 South, Range 5 East, Principal Meridian, City of Bozeman, Gallatin County, Montana, according to the official plat thereof on file and of record in the office of the County Clerk and Recorder of Gallatin County, Montana. The area of the above described parcel of land is 35.06 acres, more or less. The above-described tract of land is to be known and designated as “The Final Plat of SRX - NORTH”,City of Bozeman, Gallatin County, Montana; and the lands included in all streets, avenues, alleys, and parks or public lands shown on said plat are hereby granted and donated to the City of Bozeman forthe public use and enjoyment. Unless specifically listed herein, the lands included in all streets,avenues, alleys, and parks or public lands dedicated to the public are accepted for public use, but the City of Bozeman accepts no responsibility for maintaining the same. The owner agrees that the City ofBozeman has no obligation to maintain the lands included in all streets, avenues, alleys, and parks orpublic lands, hereby dedicated to public use. The lands included in all streets, avenues, alleys, and parks or public lands dedicated to public for which the City of Bozeman accepts responsibility formaintenance are South 17th Avenue, South 15th Avenue, and Staudaher Street. The undersigned hereby grants unto each and every person firm or corporation, whether public orprivate, providing or offering to provide telephone, electric power, gas, internet, cable television or othersimilar utility or service, the right to the joint use of an easement for the construction, maintenance,repair and removal of their lines and other facilities in, over, under and across each area designated on this plat as "Public Utility Easement" to have and to hold forever. I, ________________, Director of Community Development, City of Bozeman, Montana, do herebycertify that the accompanying plat has been duly examined and has found the same to conform to thelaw and approves it. Dated this __________ day of ____________________, 20___. ________________________________________ Director of Community Development CERTIFICATE OF GOVERNING BODY APPROVING PLAT CERTIFICATE OF COMPLETION OF NON-PUBLIC IMPROVEMENTS I, __________________, hereby certify that the following non-public improvements, required to meet therequirements of Chapter 38 of the Bozeman Municipal Code or as conditions of approval of the Final Plat ofSRX - NORTH have been installed in conformance with any approved plans and specifications prepared in accordance with the standards of Chapter 38 or other City design standards, or have been financiallyguaranteed and are covered by the subdivision improvements agreement accompanying and recorded withthis plat. Installed Improvements: NONE Financially Guaranteed Improvements: NONE I,________________, hereby warrant said improvements against any and all defects for a period of two yearsfrom the date of acceptance by _______________________ property owners association. Unless specifically listed in the Certificate of Dedication, the city accepts no responsibility for maintaining the same. The subdivider hereby grants ownership of all non-public infrastructure improvements to the ____________________ property owners association created by document number _______________. _________________ _______________________________________ Authorized Representative Dated SRX II LLC ZONING CITY OF BOZEMAN REMU, B2-M I, Jon C. Wilkinson, Montana Professional Land Surveyor License No. 16411LS, hereby certify that the Final Plat of SRX - NORTH was conducted by me in August 20____, and platted the same as shownon the accompanying plat and as described in accordance with the provisions of the MontanaSubdivision and Platting Act, §76-3-101 through §76-3-625, M.C.A., and the Bozeman Municipal Code. I further certify that monuments which have not been set by the filing date of this instrument willbe set by _________________, 20____, due to public improvements construction pursuant to24.183.1101(1)(d) A.R.M. Dated this___________day of_________________, 20____. ________________________________________________________Jon C. Wilkinson, PLS, CFedS MT Reg. #16411LSMorrison-Maierle, Inc. CERTIFICATE OF SURVEYOR I, Eric Semerad, Clerk and Recorder of Gallatin County, Montana, do hereby certify that the foregoing instrument was filed in my office at _______ o'clock, __________(a.m., or p.m.), this _________ dayof ______________, 20____, and recorded in Book ______ of Plats on page __________, andDocument # ____________________, Records of the Clerk and Recorder, Gallatin County, Montana. Dated this __________ day of ____________________, 20____. ________________________________________Eric SemeradClerk and Recorder Gallatin County, Montana CERTIFICATE OF CLERK AND RECORDER I, _______________, Treasurer of Gallatin County, Montana, do hereby certify that the accompanyingplat has been duly examined and that all real property taxes and special assessments assessed andlevied on the land to being divided have been paid. Dated this __________ day of ____________________, 20____. ________________________________________TreasurerGallatin County, Montana 00RGG70606Lot 1 Tax ID No. 00RGG70608Lot 2 Tax ID No. 00RGG70607Lot 3 Tax ID No. 000RGG7308 Lot 4 Tax ID No. CERTIFICATE OF COUNTY TREASURER 23 24 FOUND BRASS CAP SECTION CORNER FOUND A.C. PER C.C.R.F. 4-484 23 24 2526 FOUND A.C. ON 5/8 INCH REBAR MARKED MERIDIAN LAND SURVEYING,INC. MEASURED DIMENSION(M) RECORDED DIMENSION PERMINOR SUBDIVISION No. 494(R) ALUMINUM CAPA.C. CERTIFIED CORNER RECORDATION FORMC.C.R.F. CERTIFICATE OF DEDICATION CONSENT OF MORTGAGEE PROJECTAREA WEST GRAFSOUTH 19TH AVEVICINITY MAP BLOCK 1 BLOCK 2 ARNOLD STREET STAUDAHER STREET SOUTH 17TH AVENUESOUTH 15TH AVENUESOUTH 19TH AVENUEGRAF STREET NOTES NOTICE IS HEREBY GIVEN to all potential purchasers of Restricted Lot 1, of the SRX - NORTH Subdivision, City of Bozeman, Gallatin County, Montana, that the final plat of the subdivision was approved by the Bozeman City Commission without completion of on and off site improvements required under the Bozeman Municipal Code, as is allowed in Chapter 38.270 of the Bozeman Municipal Code. As such, this Restriction is filed with the final plat that stipulates that any use of this lot is subject to further subdivision, and no development of this lot shall occur until all on and off site improvements are completed as required under the Bozeman Municipal Code. THEREFORE, BE ADVISED, that Building Permits will not be issued for Restricted Lot 1, of the SRX - NORTH Subdivision, City of Bozeman, Gallatin County, Montana until allrequired on and off site improvements are completed and accepted by the City of Bozeman. No building structure requiring water or sewer facilities shall be utilized on this lot until this restriction is lifted. This restriction runs with the land and is revocable only by further subdivision or the written consent of the City of Bozeman. RESTRICTED LOT 1 LOTS - 16.03 ACRES RESTRICTED LOTS - 16.73 ACRESRIGHT-OF-WAY - 2.30 ACRESTOTAL - 35.06 ACRES AREA SUMMARY 16.73 acs BLOCK 2 LOT 17.45 acs.S0°36'42"E 91.53'S0°36'42"E 349.46'S14°38'53"E 20.62' S8°31'42"E 71.68' S40°46'21"E 79.35' N89°05'06"E 360.91'R =2 5 5 .0 0 'L =11 6 .4 3 'Δ =2 6 °0 9 '3 8 " R =3 4 5 .0 0 ' L =1 6 2 .1 9 'Δ =2 6 °5 6 '0 7 " LOT 16.84 acs.N0°41'17"W 557.28'N89°23'18"E 517.05'N89°23'18"E 760.54'N0°09'06"W 557.30'S89°23'18"W 1282.81'S0°36'42"E 440.99'S14°20'17"W 18.73' S6°12'25"W 73.92' S41°05'37"W 82.02' S89°05'06"W 438.01'N0°41'43"W 596.03'70.00' 70.00'R=180.00'L=149.40'Δ=47°33'14"R=110.00'L=91.30'Δ=47°33'14"N0°42'18"W 70.45'S0°42'18"E 70.55'R=120.00'L=99.40'Δ=47°27'38"R=190.00'L=157.39'Δ=47°27'38"N0°36'42"W 224.93'S0°36'42"E 224.93'S46°50'56"W 60.01'L=91.30'L=99.40'L=157.39'N46°50'56"E 60.01'N89°23'18"E 700.06'N89°23'18"E 507.05' 659.07' N89°06'04"E98.48'60.00'LOT 21.74 acs.S0°35'07"E 259.52'S89°23'11"W 251.12'N0°36'49"W 168.00'S89°23'18"W 114.71' R=345.00' L=162.19' Δ=26°56'07"N0°09'06"W 527.88'60.00'S89°23'18"W 334.10' S89°23'18"W 334.10'S89°23'18"W 365.96'8S8S8S8S8S8S8S8S18S18S18S18S18S18S18S18S18S18S18S18S18S18S18S18S18S18S18S18S18S10S 10S 10S 10S 10S 8S 8S 8S8S8S8S8S8S8SSS S S S S SSS S S S SS SSSSS 8S8S8S8S8S8S8S8S8SS S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S 10S S S SS8S8S8S8S8S8S8S8S8S8S8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S 8S S BP BP BP BP B P BP BP BP BP BP BP BP BP BP F TV TV E I III I S D S D S P P WCO TV TV I I I SP P SDMW XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXCOS S XXXXXXMW MW MW MW MW MW MW MW MW SD SD SDBPBPBPBPBPBPBPBPBPBP BP BP B P W S S S SSSSS SD SD SDSDSDNGNGNGNGNGNGNGNGNGNG S S 70 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W24W24W24W24W24W24W24W24W24W24W24W24W24W24W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8WDYH DYHDYH DYHDYHDYH6W 8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8WWSFIRE FIREWS WS FIRE FIRE FIREFIREWS WS WSFIREDYHWSFIREFIREFIREFIREWSWS FIRE SDSDSDSDSDSDSDSDD D D SD D D SD SD SD SD SD SD SDD SDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDD SDSDSD D SDSDSDD D SD30' WIDE PUBLIC STREETAND UTILITY EASEMENTPER PLAT J-702A ©COPYRIGHT MORRISON-MAIERLE, INC.,2025 PLOTTED DATE: Apr/08/2025 PLOTTED BY: celinesaucier DRAWING NAME: N:\5659\021 - SWX North Pre-Plat\ACAD\Survey\PRE-PLAT\5659.021 Pre Plat - DRAFT.dwg 1/4 SEC. SECTION TOWNSHIP RANGE PROJ. #:SHEET OF COUNTY,DATE: SCALE: CLIENT: FIELD WORK: DRAWN BY: CHECKED BY:32 GALLATIN 5659.021 1"=70' 08/14/2024 JW NM MMI 5 EAST 2 SOUTH 24NW MONTANA PRINCIPAL MERIDIAN, MONTANA SRX - II BEING LOTS 1,2,3, AND 4 OF BLOCK 1 OF MINOR SUBDIVISION No. 494 LOCATED IN THE NORTHWEST 1/4 OF SECTION 24, TOWNSHIP 2 SOUTH, RANGE 5 EAST, PRINCIPAL MERIDIAN, CITY OF BOZEMAN, GALLATIN COUNTY, MONTANA engineers surveyors planners scientists MorrisonMaierle2880 Technology Blvd WestBozeman, MT 59718 Phone: 406.587.0721 www.m-m.net 70 14035700 SCALE IN FEET PRELIMINARY PLAT OF OWNERSRX II LLC1450 TWIN LAKES AVE STE 201BOZEMAN MT, 59718 PURPOSE TO CREATE 3 LOTS, 1 RESTRICTED LOT, AND DEDICATION OFPUBLIC RIGHTS-OF-WAY ZONING CITY OF BOZEMANREMU, B-2M BASIS OF BEARING Bobcat Coordinate System, NAD83(2011) per the "Rocky Mountain Tribal Coordinate Reference System" Handbook and User Guide, Published September 30th, 2014 and subsequent revisions, established by observations with survey-gradeGNSS receivers. ALL LOTS ARE SUBJECT TO THE FOLLOWING UTILITY EASEMENTS (EXCEPT THE RESTRICTED LOTS):- 10' ALONG PUBLIC RIGHTS-OF-WAY- 10' ALONG SIDE LOT LINES- 10' ALONG REAR LOT LINES PUBLIC UTILITY EASEMENTS (P.U.E.) LEGEND SET A REBAR 5/8" DIA.., WITH AN ORANGE PLASTIC CAP, "MMI16411LS". FOUND REBAR AS MARKED MID-SECTION CORNER23 24 FOUND BRASS CAP SECTION CORNER FOUND A.C. PER C.C.R.F. 4-484 23 24 2526 FOUND A.C. ON 5/8 INCH REBAR MARKED MERIDIAN LAND SURVEYING,INC. MEASURED DIMENSION(M) RECORDED DIMENSION PERMINOR SUBDIVISION No. 494(R) ALUMINUM CAPA.C. CERTIFIED CORNER RECORDATION FORMC.C.R.F. BLOCK 2 ARNOLD STREET (BY OTHERS) STAUDAHER STREET SOUTH 17TH AVENUESOUTH 15TH AVENUESOUTH 19TH AVENUEWEST GRAF STREET PREVIOUS L O T 1 B L O C K 1 MINOR SUB 4 9 4 PREVIOUS L O T 4 B L O C K 1 MINOR SUB 4 9 4 PREVIOUS L O T 3 B L O C K 1 MINOR SUB 4 9 4 PREVIOUS L O T 2 B L O C K 1 MINOR SUB 4 9 4 10 FOOT WIDE PUBLIC UTILITY EASEMENT PER MINOR SUB. 494 10 FOOT WIDE PUBLIC SIDEWALK EASEMENT PER MINOR SUB. 494 15 FOOT WIDE DITCH MAINTENANCE EASEMENT PER MINOR SUB. 494 20 FOOT WIDEDITCH MAINTENANCEEASEMENT PER MINOR SUB. 494 STORM DRAINAGE EASEMENTPER MINOR SUB. 494 20 FOOT WIDE DITCH MAINTENANCE EASEMENT EXTINGUISHED PER Doc. No. 2847934 10 FOOT WIDEPUBLIC UTILITY EASEMENTPER MINOR SUB. 494 PR E V I O U S L O T L I N E PREVIOUS LOT LINEPREVIOUS LOT LINEPREVIOUS LOT LINE PREVIOUS LOT LINEPREVIOUS LOT LINE PREVIOUS LOT LINE PROPOSED WATER, SEWER AND STORM UTILITIES EXISTING WATER AND SEWER UTILITIES LOT 1 BLOC K 2 MINOR SUB 4 9 4 RESTRICTED LOT 1 16.73 ACRES BLOCK 1 70 FOOT PUBLIC ACCESS AND UTILITY EASEMENT 10 FOOT WIDE DEDICATED ROADWAYPER MINOR SUB. 494 10 FOOT WIDE PUBLIC UTILITYEASEMENT PER MINOR SUB. 494 10 FOOT WIDE PUBLIC SIDEWALK EASEMENT PER MINOR SUB. 494 10 FOOT WIDE DEDICATED ROADWAYPER MINOR SUB. 494 35 FOOT WIDE DEDICATED ROADWAY PER MINOR SUB. 494 10 FOOT WIDE PUBLIC UTILITYEASEMENT PER MINOR SUB. 494 10 FOOT WIDE PUBLIC UTILITY EASEMENT PER MINOR SUB. 494 30 FOOT WIDEDEDICATED ROADWAY PER MINOR SUB. 494 10 FOOT WIDE PUBLIC UTILITY EASEMENT PER MINOR SUB. 494 TEMPORARY STORM DRAINAGE RETENTION POND EASEMENT PER Doc. No. 2593372 TEMPORARY STORM DRAINAGE RETENTION POND EASEMENT PER Doc. No. 2593371 TEMPORARY STORMDRAINAGE RETENTION POND EASEMENT PER Doc. No. 2593371 30 FOOT WIDEDEDICATED ROADWAYPER MINOR SUB. 494 35 FOOT WIDE PUBLIC STREET AND UTILITY EASEMENT PER PLAT J-605 LOTS - 16.03 ACRESRESTRICTED LOTS - 16.73 ACRESRIGHT-OF-WAY - 2.30 ACRES TOTAL - 35.06 ACRES AREA SUMMARY GRAFAPARTMENTS LLCLOT 2, BLK 1MINOR SUB 235CALLISON SUBPHASE 4A, LOT 2PLAT J-702ANEXUS POINT LLCLOT 1 MINOR SUB235BRTR HOLDINGS II LLCLOT 1, BLOCK 3 SOUTHUNIVERSITY DISTRICTPH 3 PLAT J-695CITY OF BOZEMANCITY PARK 3 SOUTHUNIVERSITY DISTRICT PH-3PLAT J-695SOUTH 40 B O Z E M A N, L L C INSTITU T E MI N O R S U B 4 94 LOT 1, B L O C K 2 BON TON INCALLISON SUBPHASE 4A, LOT1 PLAT J-702ASOUTH 40 B O Z E M A N, L L C INSTITU T E MI N O R S U B 494 LOT 1, B L O C K 2BON TON INCALLISON SUBPHASE 4A, LOT 1PLAT J-702ABON TON INCALLISON SUBPHASE 4A, LOT 1PLAT J-702AGRAFAPARTMENTS LLCLOT 3, BLK 1MINOR SUB 235C60 FOOT WIDE DEDICATED ROADWAY 70 FOOT WIDE DEDICATED ROADWAY 23 24 23 24 2526 PROPOSED WATER AND SEWER UTILITIES PART OF THE SOUTH UNIVERSITY DISTRICT SUBDIVISION BOLLARD FIRE HYDRANT WATER VALVE SANITARY SEWER MH STORM DRAIN MH STORM DRAIN INLET S D LIGHT POLE POWER POLE W WATER WELL LEGEND EDGE OF ASPHALT FLOWLINE OF CURB TOP BACK OF CURB SIDEWALK WATER MAIN W/ SIZE8W SEWER MAIN W/ SIZE8S 1' CONTOUR - MAJOR 1' CONTOUR - MINOR WETLAND SIGN EXISTING FEATURES 8S 8S S SANITARY SEWER MH SEWER MAIN W/ SIZE 6W 6W FIRE HYDRANT WATER MAIN W/ SIZE DETENTION POND EDGE OF ASPHALT FLOWLINE OF CURB CULVERT SIDEWALK PROPOSED FEATURES TOP BACK OF CURB FUTURE WATER & SEWER FUTURE WATER & SEWER BLOCK 2 1' - NOACCESSSTRIP1' - NOACCESS STRIP 1' - NO ACCESS STRIP 1' - NO ACCESS STRIP STORM POND DITCH TEMPORARY STORMDRAINAGE EASEMENT TEMPORARY STORMDRAINAGE EASEMENT DITCH RELOCATION INTO STORM PIPE EXISTING DITCH DETERMINED NON JURISDICTIONAL (ACOE) ©COPYRIGHT MORRISON-MAIERLE, INC.,2025 PLOTTED DATE: Feb/06/2025 PLOTTED BY: rosienickelson DRAWING NAME: N:\5659\021 - SWX North Pre-Plat\ACAD\Survey\PRE-PLAT\5659.021 Pre Plat - DRAFT.dwg 1/4 SEC. SECTION TOWNSHIP RANGE PROJ. #:SHEET OF COUNTY,DATE: SCALE: CLIENT: FIELD WORK: DRAWN BY: CHECKED BY:33 GALLATIN 5659.021 8/14/2024 JW NM MMI 5 EAST 2 SOUTH 24NW MONTANA PRINCIPAL MERIDIAN, MONTANA SRX - II BEING LOTS 1,2,3, AND 4 OF BLOCK 1 OF MINOR SUBDIVISION No. 494 LOCATED IN THE NORTHWEST 1/4 OF SECTION 24, TOWNSHIP 2 SOUTH, RANGE 5 EAST, PRINCIPAL MERIDIAN, CITY OF BOZEMAN, GALLATIN COUNTY, MONTANA engineers surveyors planners scientists MorrisonMaierle2880 Technology Blvd WestBozeman, MT 59718 Phone: 406.587.0721 www.m-m.net PRELIMINARY PLAT OF OWNER SRX II LLC 1450 TWIN LAKES AVE STE 201 BOZEMAN MT, 59718 PURPOSETO CREATE 3 LOTS, 1 RESTRICTED LOTAND DEDICATION OF PUBLIC RIGHTS-OF-WAY ZONING CITY OF BOZEMAN REMU, B-2M 1. All street rights-of-way contiguous to or within the proposed development site not used for street pavement, curbs, gutters, sidewalks or driveways (i.e., street boulevards) shall be landscaped, as defined in the Bozeman Municipal Code, and shallinclude one (1) large canopy tree for each 50 feet of total street frontage rounded to the nearest whole number. For streettrees, a City of Bozeman planting permit for street trees and obtaining utility locations before any excavation begins in theCity of Bozeman right-of-way. The subdivision landscape plans shall contain a planting note stating that the planting hole shall be at least twice the diameter of the root ball, that the root flare of the newly planted tree is visible and above ground, and there shall be a mulch ring 3'- 4' in diameter around each newly planted boulevard tree. 2. City standard sidewalks (including a concrete sidewalk section through all private drive approaches) shall be constructed on all public and private street frontages prior to occupancy of any structure on individual lots. Upon the 1 year anniversary (second with concurrent construction) of the plat recordation of any phase of the subdivision, any lot owner who has not constructed the required sidewalk shall, without further notice, construct within 30 days, the sidewalk for their lot(s), regardless of whether other improvements have been made upon the lot. 3. Ownership of all common open space areas and responsibility of maintenance thereof and for city assessments levied on thecommon open space lands shall be that of the property owners' association. Maintenance responsibility must include, inaddition to the common open space all vegetative ground cover, snow removal, boulevard trees and irrigation systems in the public right-of-way boulevard strips along all external perimeter development streets and as adjacent to public parks or other common open space areas. All areas within the subdivision that are designated herein as common open space, including pathways, are for the use and enjoyment by the residents of the development and the general public. The property owners' association is responsible for levying annual assessments to provide for the maintenance, repair, and upkeep of all common open space areas and trails. At the same time of recording the final plat the subdivider shall transfer ownership of all common open space areas to the property owners' association created by the subdivider to maintain all common open space areas within the Subdivision. 4. This is a known area of high groundwater. No crawl spaces or basements may be constructed. Sump pumps are not allowed to be connected to the sanitary sewer system. Sump pumps are not allowed to be connected to the drainage system. Waterfrom sump pumps may not be discharged into streets, such as into the curb and gutter where they create a safety hazard forpedestrians and vehicles. 5. The property owners' association is responsible for maintenance of any lighting located outside of public street rights-of-ways. 6. The property owners' association is responsible for maintenance of all stormwater infrastructure located outside public street rights-of-way. 7. Cash-in-lieu of water rights will be paid a final plat. 8. The Parks and Recreation Department does not assume maintenance responsibility until park improvements have been installed and fully accepted on behalf of the City. 9. Block 1, Lot 1 has been platted as a commercial lot and is exempt from park and recreation requirements per BMC Section 38.420.B.2. - parcels that are created which are non-residential. Development of Block 2, Lot 2 must be consistent withnon-residential use. Upon subsequent development, if the lot is no longer exempt from the park dedication requirement thedevelopment is subject to BMC Section 38.420.020.A. Certificate of Transfer of Ownership and Completion of Non-Public Improvements; and Conditions of Approval : The following are hereby granted and donated to the property owners association noted below for their use and enjoyment:Common Open Space parcels designated Storm Water Tract. Unless specifically listed in the Certificate of Dedication, the cityaccepts no responsibility for maintaining the same SRX II LLC hereby further certify that the following non-public improvements,required to meet the requirements of chapter 38 of the Bozeman Municipal Code, or as a condition(s) of approval of the subdivision plotted herewith, have been installed in conformance with any approved plans and specifications prepared in accordance with the standards of Chapter 38 or other City design standards, or have been financially guaranteed and are covered by the subdivision improvements agreement accompanying and recorded with this plat. Installed Improvements: NONE Financially Guaranteed Improvements: NONE The subdivider hereby grants ownership of all non-public infrastructure improvements to the property owners association createdby document number _____________________________________. We further certify that the text and/or graphics shown on the Conditions of Approval sheet represents requirements by thegoverning body for final plat approval and that all conditions of subdivision application have been satisfied; and that theinformation shown is current as of the date of the certification, and that changes to any land use restrictions or encumbrancesmay be made by amendment to covenants, zoning regulations, easements, or other documents as allowed by law or localregulations. SRX II LLC By: ___________________________________________________________________________________________________________, Authorized Representative Dated State of ____________________________________ County of ___________________________________ On this ________________ day of ___________________________, 2024, before me, the undersigned Notary Public for the State of _____________________ personally appeared _______________________, known to me to be the Authorized Representative of SRX II LLC and acknowledged to me that said Inc. executed the same. Notary Public in and for the State of ___________________ Printed Name _____________________________________Residing at _______________________________________My commission expires _____________________________ CERTIFICATE OF COMPLETION OF WATER-RELATED IMPROVEMENTS I, _____________________, hereby certify that the following improvements, necessary to meet therequirements of chapter 38 of the Bozeman Municipal Code or as a condition(s) of approval of TheFinal Plat of South Range Crossing North Subdivision, have been installed in conformance with the approved plans and specifications, or financially guaranteed and covered by the improvements agreement accompanying this plat. Installed Improvements: _______ Financially Guaranteed Improvements: ________ The subdivider hereby warrants said improvements against any and all defects for a period of two years from the date of acceptance by the City of Bozeman. The subdivider hereby grants ownership of all public infrastructure improvements to the City of Bozeman and the city hereby accepts ownership ofall public infrastructure improvements, subject to the above indicated warranty. ______________________ ____________________________ Authorized Representative Dated SRX II LLC _________________ ____________________________ Dated Director of Transportation and Engineering Department City of Bozeman, Montana CONDITIONS OF APPROVAL SHEET Record Documents: Document No. 2600277 (MINOR SUBDIVISION NO. 494) Document No. 2593372 (TEMPORARY STORM DRAINAGE RETENTION POND EASEMENT) Document No. 2584223 (PLAT J-605) BPBPBPBPBP BPBPBPBPBPFTV TVE III I I SDSDSPPWCOTVTVIIISPPSD MW XXXXXXXXXXXXXXXXXXXXXX XXXXXX XXCOSS XX XXMW MW MW MWMW MW MW MW MWSDSDBPBPBPBPBPBPBPBPBPWSSSSSSSD SDSDNG NG NGNGNGNGNG S S4980.7210W10W10W10W10W10W10W10W10W10W10WDYH DYHDYH DYH10S10S10S10S DYH8W8W8W8W8W8W8W8W8W 8W8W8W8W8W8W8W8W8W 8W 8W 8W 8W 8W 8W DYH DYHDYH DYH 8W 8W 8W 8W 8W 8W 8WWSFIREFIREWSWSFIREWSWS DYH WSWS18S 18S 18S 18S 18S 18S 18S 18S 18S 18S 18S 18S 18S18S18S18S8S8S8S8S8S8S8SSSSSSS SSS8S 8S 8S 8S 8S 8SSS 10S10S10S10S10S10S10S10S10S10S10S10S10S10S10SSSSHH HHHHHHHH HHHHHHMSDSDSDSDSDSDDDD SDD DDSDSDSDSDSDSDSDSDDSDSDSDSDSDDSD SD D D WSWSWSS 17TH AVE STAUDAHER STFIGURE NUMBER©PROJECT NO.DRAWN BY:DSGN. BY:APPR. BY:DATE:COPYRIGHT MORRISON-MAIERLE, 2025Plotted by rosie nickelson on Feb/24/2025engineers surveyors planners scientistsMorrisonMaierle2880 Technology Blvd WestBozeman, MT 59718406.587.0721www.m-m.netN:\5659\021 - SWX North Pre-Plat\ACAD\Exhibits\5659.021_Phasing Exhibit.dwg 5659.021EX-1SRX-II SUBDIVISION BOZEMANMONTANAPHASE 1PHASING EXHIBITRSNCMSMEE02/2025100200501000SCALE IN FEETBLOCK 1LOT 1BLOCK 2LOT 1RESTRICTED LOT 1BLOCK 2LOT 2S 15TH AVE ARNOLD STS 19TH AVE KEY NOTESSEWERINSERT MANHOLE AND CONNECT TO EXISTING 18" SEWER MAINPROPOSED 8" SEWER MAINSEWER SERVICE (TYP.)PROPOSED 10" SEWER MAINWATERCONNECT TO EXISTING WATER MAIN STUBPROPOSED 8" WATER MAINWATER SERVICE (TYP.)FIRE SERVICE (TYP.)8" WATER MAIN STUB WITH TEMPORARY BLOW OFFSFIRE HYDRANT (TYP.)STORM DRAINAGECONNECT TO EXISTING STORM MAINSTORM DRAINAGE MAINTEMPORARY STORM DRAINAGE BASINREMOVE EXISTING STORM PONDIRRIGATION DITCHESRE-ROUTE 15TH DITCHROADWAY IMPROVEMENTSWIDEN EXISTING SIDEWALK TO A 10' MULTI-USE PATHTYP. 35' TBC-TBC ROADWAY SECTION (60' ROW)10' WIDE MULTIUSE PATHTEMPORARY BARRICADE SIGNSTYP. 47' TBC-TBC ROADWAY SECTION (70' ROW)TEMPORARY 6' GRAVEL FINES PATH TO SUD PARK (SEE LANDSCAPE PLANS FOR DETAIL)35' TBC-TBC ROADWAY SECTION (60' ROW) W/ BIKE SHARROW SYMBOLSLIGHTING IMPROVEMENTSALL LIGHTING IMPROVEMENTS WILL BE INSTALLED IN PHASE 11231231234412345112424112225355565124111125744SRX-II PHASING EXHIBIT62533422532667 BPBPBPBPBP BPBPBPBPBPFTV TVE III I I SDSDSPPWCOTVTVIIISPPSD MW XXXXXXXXXXXXXXXXXXXXXX XXXXXX XXCOSS XX XXMW MW MW MWMW MW MW MW MWSDSDBPBPBPBPBPBPBPBPBPWSSSSSSSD SDSDNG NG NGNGNGNGNG S S4980.7210W10W10W10W10W10W10W10W10W10W10WDYH DYHDYH DYH DYH10S10S10S10S S DYH8W8W8W8W8W8W8W8W8W 8W8W8W8W8W8W8W8W8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8WDYH DYH DYHDYH DYH DYH 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8W 8WWSFIREFIREWSWSFIREWSWSDYHWSWS 8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8W8S8S8S8S8SSDSDSDSDSD18S18S18S18S18S18S18S18S18S18S18S18S 18S18S18S18S8S8S8S8S8S8S8SSSSSSS SSS8S 8S 8S 8S 8S 8SSS 10S10S10S10S10S10S10S10S10S10S10S10S10S10S10SSSS 8S 8S 8S 8S 8S 8S 8S 8S8S8S8S8S8S8S8S8S8S8S8S8S8S8S8SHH HHHHHHHH HHHHHHMSDSDSDSDSDSDDDD SDD DDSDSDSDSDSDSDSDSDDSDSDSDSDSDDD D SDSDSDSDSDDDSD SD SD SD SD DWSWSWSSD SD SD SD SD DDDD STAUDAHER STFIGURE NUMBER©PROJECT NO.DRAWN BY:DSGN. BY:APPR. BY:DATE:COPYRIGHT MORRISON-MAIERLE, 2025Plotted by rosie nickelson on Feb/24/2025engineers surveyors planners scientistsMorrisonMaierle2880 Technology Blvd WestBozeman, MT 59718406.587.0721www.m-m.netN:\5659\021 - SWX North Pre-Plat\ACAD\Exhibits\5659.021_Phasing Exhibit.dwg 5659.021EX-2SRX-II SUBDIVISION BOZEMANMONTANAFUTURE PHASESPHASING EXHIBITRSNCMSMEE02/2025100200501000SCALE IN FEETNOTE: ARNOLD STREET MUST BE COMPLETED BY OTHERS OR THESRX-II DEVELOPER PRIOR TO FINAL PLATTING OF THE NORTH HALF OFTHE DEVELOPMENT.BLOCK 1LOT 1BLOCK 2LOT 1RESTRICTED LOT 1BLOCK 2LOT 2ARNOLD ST(DESIGNED BY OTHERS)W GRAF STS 17TH AVE S 15TH AVE S 19TH AVE KEY NOTESSEWERPROPOSED 8" SEWER MAINWATERCONNECT TO EXISTING WATER MAIN STUBPROPOSED 8" WATER MAINWATER SERVICE (TYP.)FIRE HYDRANT (TYP.)STORM DRAINAGEFINAL STORM DRAINAGE DESTINATION TBD. PONDS ARE PROPOSED TO BE LOCATEDALONG THE NORTH SIDE OF THE DEVELOPMENT, SOUTH OF ARNOLD.IRRIGATION DITCHESPIPE THE REMAINING DITCH ALONG 15TH STREETROADWAY IMPROVEMENTSTYP. 35' TBC-TBC ROADWAY SECTION (60' ROW)REMOVE TEMPORARY BARRICADE SIGNSTYP. 47' TBC-TBC ROADYWAY SECTION (70' ROW)WIDEN EXISTING SIDEWALK TO 10' MULTI-USE PATH35' TBC-TBC ROADWAY SECTION (60' ROW) W/ BIKE SHARROW SYMBOLSINSTALL TRAFFIC CALMING FEATURE (TRAFFIC CIRCLE)1231412311112243322SRX-II PHASING EXHIBIT154414111566 R=300.00'L=141.03'Δ=26°56'07"CB=S76°23'31"WCH=139.74' S0°09'06"E 1225.02' S89°05'06"W30.00'XXXXXXR=345.00'L=162.19'Δ=26°56'07"60.00'R=345.00'L=162.19'Δ=26°56'07"N0°09'06"W 527.88' S89°23'18"W 334.10'S89°23'18"W 334.10'1+002+003+004+005+006+007+008+0030.00'DEDICATEDROADWAY10.00' PUE(TYP.)30.00' PUBLIC STREETAND UTILITYEASEMENT4965 4970 4975 4980 4985 4965 4970 4975 4980 4985 FG-4980.88EG-4980.881+00 FG-4979.96EG-4979.96FG-4976.74EG-4976.742+00 FG-4976.31EG-4976.31FG-4975.72EG-4975.723+00 FG-4974.66EG-4974.66FG-4973.84EG-4973.844+00 FG-4973.91EG-4973.91FG-4973.80EG-4973.805+00 FG-4972.89EG-4972.89FG-4971.73EG-4971.736+00 FG-4970.72EG-4970.72FG-4970.33EG-4970.337+00 FG-4969.55EG-4969.55FG-4969.14EG-4969.148+00 EXISTING GRADE@ ROAD CENTERLINE MATCH EXISTING GRADE -1.32% -2 5 . 00%STA=1+50.00ELEV=4979.96STA=7+39.51ELEV=4972.17 STA=7+50.00ELEV=4969.55 VERIFY SCALE! THESE PRINTS MAY BE REDUCED.LINE BELOW MEASURES ONE INCHON ORIGINAL DRAWING. MODIFY SCALE ACCORDINGLY! 2025COPYRIGHT © MORRISON-MAIERLE, SHEET NUMBER PROJECT NUMBER DRAWING NUMBER DATEDESCRIPTIONNO.BY N:\5659\021 - SWX NORTH PRE-PLAT\ACAD\SHEETS\1_PREPLAT\5659.021 PLAN & PROFILES.DWGREVISIONS DRAWN BY: DSGN. BY: APPR. BY: DATE: Q.C. REVIEW DATE: BY: 2880 Technology Blvd WestBozeman, MT 59718 406.587.0721 www.m-m.netengineers surveyors planners scientists MorrisonMaierle PLOTTED BY:ROSIE NICKELSON ON Feb/06/2025 SRX-II SUBDIVISIONPRELIMINARY PLATBOZEMAN MONTANA S 15TH AVE ROAD PROFILESTA 1+00 TO 8+00 5659.021 2 R-2 CGD CMS MEE 08/13/24 PRELIMINARY PLATFEBRURARY 20250 VERT. SCALE IN FEET 0 HORIZ. SCALE IN FEET 1.53 3 6 1530 30 60 ALLISON SUBDIVISION (J-702A) SOUTH 15TH AVE SRX - NORTH BLOCK 2 LOT 2W GRAF STREET (90 ' ROW )STAUDAHER STREET (60' ROW)SRX - NORTHRESTRICTEDLOT 1 SOUTH 15TH AVENUE (60' ROW) END CONSTRUCTION LIMITS INSTALL DEAD ENDBARRICADEPER COB STD 09810-2 END OF ASPHALT 5' SIDEWALK S89°05'06"W 1050.03'S0°36'42"E668.14' N0°36'42"W254.93'MWS0°36'42"E 91.53'S0°36'42"E 349.46' S14°38'53"E20.62' S8°31'42"E 71.68' S40°46'21"E 79.35' S0°36'42"E 440.99' S14°20'17"W18.73' S6°12'25"W 73.92' S41°05'37"W 82.02'70.00'N0°36'42"W 224.93' S0°36'42"E 224.93'N89°06'04"E98.48'N0°36'49"W 168.00'S89°23'18"W 114.71'1+002+003+004+005+006+007+008+009+00PI: 2+57.5310.00' PUE (TYP.)4965 4970 4975 4980 4985 4965 4970 4975 4980 4985 FG-4983.38EG-4983.381+00 FG-4981.56EG-4981.56FG-4980.50EG-4980.502+00 FG-4978.11EG-4978.11FG-4977.42EG-4977.423+00 FG-4977.17EG-4977.17FG-4975.06EG-4975.064+00 FG-4975.21EG-4975.21FG-4974.06EG-4974.065+00 FG-4973.85EG-4973.85FG-4973.04EG-4973.046+00 FG-4972.31EG-4972.31FG-4971.62EG-4971.627+00 FG-4970.96EG-4970.96FG-4969.92EG-4969.928+00 FG-4969.02EG-4969.028+50 EXISTING GRADE@ ROAD CENTERLINE PROPOSED GRADE@ ROAD CENTERLINE -1.30% -1.72% -1.37% -1.52% -2 5 .00% STA=1+99.99ELEV=4980.50 STA=2+92.07ELEV=4979.30 STA=7+99.99ELEV=4972.17STA=7+29.86ELEV=4973.31STA=7+62.32ELEV=4972.82STA=8+10.04ELEV=4969.66MATCH EXISTING GRADE VERIFY SCALE! THESE PRINTS MAY BE REDUCED.LINE BELOW MEASURES ONE INCHON ORIGINAL DRAWING. MODIFY SCALE ACCORDINGLY! 2025COPYRIGHT © MORRISON-MAIERLE, SHEET NUMBER PROJECT NUMBER DRAWING NUMBER DATEDESCRIPTIONNO.BY N:\5659\021 - SWX NORTH PRE-PLAT\ACAD\SHEETS\1_PREPLAT\5659.021 PLAN & PROFILES.DWGREVISIONS DRAWN BY: DSGN. BY: APPR. BY: DATE: Q.C. REVIEW DATE: BY: 2880 Technology Blvd WestBozeman, MT 59718 406.587.0721 www.m-m.netengineers surveyors planners scientists MorrisonMaierle PLOTTED BY:ROSIE NICKELSON ON Feb/06/2025 SRX-II SUBDIVISIONPRELIMINARY PLATBOZEMAN MONTANA S 17TH AVENUE ROAD PROFILESTA 1+00 TO 8+50 5659.021 1 R-1 CGD CMS MEE 08/13/24 PRELIMINARY PLATFEBRURARY 20250 VERT. SCALE IN FEET 0 HORIZ. SCALE IN FEET 1.53 3 6 1530 30 60W GRAF STREET (90' ROW)SOUTH 17TH AVENUE STAUDAHER STREET (60' ROW)END CONSTRUCTION LIMITS SRX - NORTH BLOCK 2 LOT 2 SRX - NORTHBLOCK 1LOT 1 SOUTH 17TH AVENUE (70' ROW) SRX - NORTHRESTRICTEDLOT 1 SRX - NORTHBLOCK 2LOT 1 INSTALL DEAD ENDBARRICADEPER COB STD 09810-2 6' SIDEWALK 6' SIDEWALK N0°42'18"W 1293.56'N89°23'18"E 593.92' MW S0°36'42"E 91.53'N89°23'18"E 517.05'70.00'N0°36'42"W 224.93'S0°36'42"E 224.93'N89°23'18"E 507.05'60.00'7+00 8+00 9+00 0+001+002+003+004+005+006+00STAUDAHER ST 4965 4970 4975 4980 4985 4965 4970 4975 4980 4985 FG-4975.13EG-4975.130+00 FG-4971.21EG-4971.21FG-4971.96EG-4971.961+00 FG-4971.81EG-4971.81FG-4971.60EG-4971.602+00 FG-4971.18EG-4971.18FG-4970.65EG-4970.653+00 FG-4970.78EG-4970.78FG-4970.80EG-4970.804+00 FG-4970.96EG-4970.96FG-4970.91EG-4970.915+00 FG-4970.90EG-4970.90FG-4970.85EG-4970.856+00 EXISTING GRADE@ ROAD CENTERLINE PROPOSED GRADE@ ROAD CENTERLINE VPI STA=3+59.78VPI ELEV=4975.73K=40.00LVC=115.56'VPC STA=3+02.00VPC ELEV=4975.09VPT STA=4+17.56VPT ELEV=4974.704.17% 3.00%-3.00% -4.17% -4.17%4.17% 1.10%0.50% 2.67% 1.50% -0.50% -1.50% -1.09% -1.78% -1.78%STA=0+23.71ELEV=4974.34STA=0+57.82ELEV=4975.09STA=0+77.68ELEV=4975.29STA=0+97.49ELEV=4975.09STA=5+00.00ELEV=4973.23STA=5+59.22ELEV=4972.17STA=5+86.72ELEV=4972.82VPI STA=2+00.23VPI ELEV=4973.97K=47.31LVC=104.05'VPC STA=1+48.21VPC ELEV=4974.54VPT STA=2+52.25VPT ELEV=4974.54MATCH EXISTINGGRADE VERIFY SCALE! THESE PRINTS MAY BE REDUCED.LINE BELOW MEASURES ONE INCHON ORIGINAL DRAWING. MODIFY SCALE ACCORDINGLY! 2025COPYRIGHT © MORRISON-MAIERLE, SHEET NUMBER PROJECT NUMBER DRAWING NUMBER DATEDESCRIPTIONNO.BY N:\5659\021 - SWX NORTH PRE-PLAT\ACAD\SHEETS\1_PREPLAT\5659.021 PLAN & PROFILES.DWGREVISIONS DRAWN BY: DSGN. BY: APPR. BY: DATE: Q.C. REVIEW DATE: BY: 2880 Technology Blvd WestBozeman, MT 59718 406.587.0721 www.m-m.netengineers surveyors planners scientists MorrisonMaierle PLOTTED BY:ROSIE NICKELSON ON Feb/06/2025 SRX-II SUBDIVISIONPRELIMINARY PLATBOZEMAN MONTANA STAHDAHER STREET ROAD PROFILESTA 0+00 TO STA 6+00 5659.021 3 R-3 CGD CMS MEE 08/13/24 PRELIMINARY PLATFEBRURARY 2025 0 VERT. SCALE IN FEET 0 HORIZ. SCALE IN FEET 2.55 5 10 1530 30 60 STAUDAHER STREET (60' ROW)SOUTH 17TH AVENUE (70' ROW)STAUDAHER STREETSOUTH 19TH AVENUE (100' ROW) 5' SIDEWALK SRX - NORTH RESTRICTED LOT 1 SRX - NORTHBLOCK 1 LOT 1 S0°09'06"E 1225.02'254.93'XXXXXXS0°36'42"E 91.53'N89°23'18"E 760.54'70.00'N0°36'42"W 224.93'S0°36'42"E 224.93'N89°23'18"E 700.06'60.00'S0°35'07"E 259.52'S89°23'18"W 114.71' S89°23'18"W 334.10' S89°23'18"W 334.10'S89°23'18"W 365.96'5+006+007+008+009+0010+0011+0012+0013+0013+9510.00' PUE (TYP.) 10.00' PUE (TYP.) 4965 4970 4975 4980 4985 4965 4970 4975 4980 4985 FG-4970.85EG-4970.856+00 FG-4970.70EG-4970.70FG-4970.75EG-4970.757+00 FG-4970.84EG-4970.84FG-4970.36EG-4970.368+00 FG-4970.40EG-4970.40FG-4970.76EG-4970.769+00 FG-4970.51EG-4970.51FG-4969.94EG-4969.9410+00 FG-4970.06EG-4970.06FG-4970.04EG-4970.0411+00 FG-4970.13EG-4970.13FG-4970.48EG-4970.4812+00 FG-4971.11EG-4971.11FG-4970.53EG-4970.5313+00 FG-4970.30EG-4970.30FG-EG-13+95 VPI STA=9+62.27VPI ELEV=4975.02K=55.00LVC=54.74'VPC STA=9+34.90VPC ELEV=4974.88VPT STA=9+89.64VPT ELEV=4974.88-4.17%4.17% 3.00%-3.00% -6.40%4.17% -4.17%134.96% -2.73%0.00% 1.50% 2.46% 1.46%-1.73% -0.50% -0.73%1.00% 0.50%STA=6+08.22ELEV=4972.17STA=6+50.00ELEV=4973.05STA=6+83.10ELEV=4973.53STA=7+03.18ELEV=4973.73STA=12+61.84ELEV=4973.52STA=12+83.06ELEV=4973.36STA=13+00.00ELEV=4973.07STA=13+31.53ELEV=4972.21STA=13+52.03ELEV=4972.65STA=13+67.78ELEV=4972.13STA=13+81.03ELEV=4972.77VERIFY SCALE! THESE PRINTS MAY BE REDUCED.LINE BELOW MEASURES ONE INCHON ORIGINAL DRAWING. MODIFY SCALE ACCORDINGLY! 2025COPYRIGHT © MORRISON-MAIERLE, SHEET NUMBER PROJECT NUMBER DRAWING NUMBER DATEDESCRIPTIONNO.BY N:\5659\021 - SWX NORTH PRE-PLAT\ACAD\SHEETS\1_PREPLAT\5659.021 PLAN & PROFILES.DWGREVISIONS DRAWN BY: DSGN. BY: APPR. BY: DATE: Q.C. REVIEW DATE: BY: 2880 Technology Blvd WestBozeman, MT 59718 406.587.0721 www.m-m.netengineers surveyors planners scientists MorrisonMaierle PLOTTED BY:ROSIE NICKELSON ON Feb/06/2025 SRX-II SUBDIVISIONPRELIMINARY PLATBOZEMAN MONTANA STAUHDAHER STREET ROAD PROFILESTA 6+00 TO 13+95 5659.021 4 R-4 CGD CMS MEE 08/13/24 PRELIMINARY PLATFEBRURARY 20250 VERT. SCALE IN FEET 0 HORIZ. SCALE IN FEET 1.53 3 6 1530 30 60 STAUDAHER STREET (60' ROW) SRX - NORTHBLOCK 2LOT 1 SRX - NORTH RESTRICTED LOT 1 SOUTH 15TH AVENUE (60' ROW)SOUTH 17TH AVENUE (70' ROW)STAUDAHER STREET END CONSTRUCTIONLIMITS SRX - NORTHBLOCK 2LOT 2 INSTALL DEAD ENDBARRICADEPER COB STD 09810-25' SIDEWALK STORMWATER DESIGN REPORT FOR THE SRX-II SUBDIVISION BOZEMAN GALLATIN COUNTY MONTANA Prepared By: Morrison-Maierle, Inc. 2880 Technology Blvd. West P.O. Box 1113 Bozeman, Montana 59771-1113 Engineer: Celine Saucier, P.E. Date: June 20, 2025 File: 5659.021 SRX-II SUBDIVISION - STORMWATER DESIGN REPORT N:\5659\021 - SWX North Pre-Plat\04 Design\Reports\Stormwater\Text\5659.021_StormDrainageReport.docx Page 1 Table of Contents 1 Introduction ......................................................................................................................... 3 2 Proposed Development ....................................................................................................... 3 2.1 Project Location and Description ................................................................................ 3 2.2 Development Horizon ................................................................................................. 3 3 Existing Area Conditions ..................................................................................................... 3 3.1 Existing Land Cover and Slopes ................................................................................. 3 3.2 NRCS Soils ................................................................................................................ 4 3.3 Site Groundwater Levels ............................................................................................ 4 3.4 Existing Drainage Features......................................................................................... 4 4 Major Drainage Basins ........................................................................................................ 4 5 Methodologies .................................................................................................................... 6 5.1 Design Methodology ................................................................................................... 7 5.2 Design Storm Analyses .............................................................................................. 7 5.3 Storm Drain Capture and Conveyance ....................................................................... 7 5.4 Stormwater Treatment Facilities ................................................................................. 8 5.5 Overflow ..................................................................................................................... 9 5.6 Irrigation Ditches ........................................................................................................10 6 Maintenance ......................................................................................................................10 7 Conclusions .......................................................................................................................10 List of Exhibits Exhibit A Vicinity Map Exhibit ST-1 Post-Development Drainage Basins List of Appendices Appendix A NRCS Soil Report Appendix B Geotechnical Report Appendix C Groundwater Data Appendix D Stormwater Calculations Appendix E Operation and Maintenance Manual Appendix F Stormwater Management Plan for Yellowstone Theological Institute, Dec. 2015 Appendix G Storm Water Design Report for South Range Crossing Subdivision, Nov. 2023 Appendix H Stormwater Design Report for Blackwood Groves Subdivision, January 2022 SRX-II SUBDIVISION - STORMWATER DESIGN REPORT N:\5659\021 - SWX North Pre-Plat\04 Design\Reports\Stormwater\Text\5659.021_StormDrainageReport.docx Page 2 1 INTRODUCTION This report provides a basis of storm drain design for the SRX-II Subdivision project. The storm drain system serving SRX-II was designed and shall be installed in accordance with the following: · The City of Bozeman Design Standards and Specifications Policy (dated May 1, 2017) o Including Addendum Numbers 1 thru 6 · Montana Public Works Standard Specifications (MPWSS) – 6th Edition · The City of Bozeman Modifications to MPWSS 2 PROPOSED DEVELOPMENT 2.1 Project Location and Description The proposed SRX-II Subdivision encompasses a total of 35.06 acres and is generally located at the northeast corner of Graf Street and South 19th Avenue. The property is within the boundaries of the City of Bozeman, Montana and was annexed in August of 2006. The proposed development is zoned B-2M and REMU. See the vicinity map (Exhibit A) for additional location details. The following is the legal description for the property: Lots 1, 2, 3, and 4 of Block 1 of Minor Subdivision 494. Located in the NW1/4 of Section 24, Township 2 South, Range 5 East, P.M.M., City of Bozeman, Gallatin County, Montana The property has historically been utilized for agricultural purposes but has been inactive recently. Some remnant crops persist, but most vegetation is absent other than miscellaneous native weeds. Existing groundwater in the area is relatively shallow, and the results of ground water monitoring completed in 2022 are included in Appendix C. Stormwater will generally be conveyed using storm drain mains to ponds as designated on Exhibit ST-1. Stormwater generated by each lot will be treated on site by using treatment ponds or underground storage chambers on site. These designs will be performed separately during future site planning applications. The stormwater system for the project was designed in accordance with Montana Public Works Standard Specifications (MPWSS); The City of Bozeman Modifications to MPWSS; and the City of Bozeman Design Standards and Specifications Policy March of 2004 (and all Addenda). 2.2 Development Horizon The project will begin development a soon as the required approvals are in place and is tentatively scheduled for summer of 2025. 3 EXISTING AREA CONDITIONS 3.1 Existing Land Cover and Slopes The existing property is primarily vacant, abandoned agricultural land. The existing slopes range from 0% to 4% and generally drain from south to north. SRX-II SUBDIVISION - STORMWATER DESIGN REPORT N:\5659\021 - SWX North Pre-Plat\04 Design\Reports\Stormwater\Text\5659.021_StormDrainageReport.docx Page 3 3.2 NRCS Soils Data on existing site soils is provided in the Gallatin County Area, Montana Soil Survey dated December 11, 2023 through Web Soil Survey (WSS) operated by the United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS). According to information obtained from WSS, the site contains two basic soil types – Meadowcreek Loam and Blackmore Silt Loam. See Appendix A for the complete Soil Resource Report. 3.3 Site Groundwater Levels Groundwater levels beneath the proposed subdivision experience seasonal variations but are generally relatively high. The groundwater levels onsite range between approximately 1 and 5 feet below existing grade based on well monitoring performed from May 2023 to September of 2023 and was highest during the spring runoff season. Complete groundwater observation data is provided in Appendix C, including a map showing the locations of each well. High groundwater is a major design factor for this subdivision. Storm treatment structures for the subdivision were designed with bottom elevations above the seasonal high ground water level to ensure they will drain as required. Stormwater treatment structures were designed with sufficient storage to treat the Runoff Reduction Volume (first ½” over impervious areas). Overflow pathways for treatment basins was considered to the extent practical that will allow larger storm events sufficient drainage pathways to prevent inundating structures. Each detention area is designed to capture the first 0.5” of runoff from impervious areas to meet the State of Montana MS4-required levels prior to release. 3.4 Existing Drainage Features An existing irrigation ditch located east of 19th Avenue will be preserved as close to existing conditions as possible. The ditch actively conveys water owned by the Middle Creek Ditch Company to downstream users. A remnant ditch along the east boundary of the property (adjacent to 15th Avenue) will be relocated into the 24” storm conveyance within the 15th Street ROW. An existing temporary storm drainage retention pond is located on the northwest corner of the property and receives runoff from S 19th Avenue. Another temporary storm drainage retention pond is located north of the roundabout on W Graf Street and receives runoff from W Graf Street and South Range Crossing Subdivision. This pond will be filled in and the volume will be relocated to a temporary retention pond created north of 17th Street and Staudaher, eventually conveyed to a permanent basin along the northern boundary of the property. 4 MAJOR DRAINAGE BASINS The pre-development drainage basin for SRX-II was estimated to be undeveloped agricultural land and a conservative estimated runoff coefficient of 0.20 was used. To determine the pre- development discharge, the hydraulically longest time of concentration was estimated based on the existing contours and flow paths. Considering the relatively even grading of the site from south to north, this method of analysis provides a reasonable estimation of the current pre-development conditions. The site is estimated to have a predevelopment discharge rate of 2.86 cfs (Appendix D). SRX-II SUBDIVISION - STORMWATER DESIGN REPORT N:\5659\021 - SWX North Pre-Plat\04 Design\Reports\Stormwater\Text\5659.021_StormDrainageReport.docx Page 4 The proposed development is divided into two post-development basins based on the collection and conveyance systems. The proposed stormwater treatment facilities in each basin are sized for the 10-year 2-hour storm. A composite coefficient was calculated for each drainage basin and the longest time of concentration was used to estimate the post-development discharge flow rate. Due to the phasing of SRX-II, two temporary storm ponds will be built north of Staudaher, and will eventually be relocated to permanent ponds along the northern boundary of the Restricted Lot 1. The storm drain system was designed to capture and convey using a system of surface drainage features, curb and gutter, inlets, and storm drain mains. This water will then be treated using surface retention ponds. See Exhibit ST-1 for a visual representation of the major drainage basins that were considered. This exhibit shows the general grading drainage pathways assumed for the analysis. Temporary Pond 1 Temporary Pond 1 will include run-off from Sub Basin 1.1 – 1.6 The temporary retention pond north of the roundabout on W Graff Street will be relocated to Temp Pond 1 as well. The existing conditions from the temporary retention pond are as follows: South Range Crossing Subdivision Runoff Per the Stormwater Management Plan for Yellowstone Theological Institute December 2015 (Appendix F), the original design was that the southern 40-acre lot (Lot 1 Block 2), now South Range Crossing Subdivision, would drain north to the storm sewer system under Graf Street. However, the storm design of the property was revised and the piping from SRX South across Graf now only receives a small amount of predevelopment rate outfall. Per the Storm Water Design Report for the South Range Crossing Subdivision November 2023, a portion of the discharge for the South Range Crossing Subdivision during 10-year storm will flow to a stub to Graf and is proposed to be 0.17cfs. This flow is conveyed from the North Graf Pond (Basin Sub-01 via Pipe “Out-Cantor”) and outflows to the existing 42” storm pipe that crosses Graf to the north and currently discharges into the temporary storm pond. Using the rational method, the volume needed to be retained from this portion of South Range Crossing is: Volume = 7200 = 7200 × 0.17 = , The 25-year flow out of South Range Crossing that needs to be conveyed through SRX-II is 1.11cfs. See Appendix G for the relevant excerpts of the South Range Crossing Subdivision Report from 2023 that pertains to the offsite flows from South Range Crossing. W Graf Street Runoff The original calculations from Stormwater Management Plan for Yellowstone Theological Institute December 2015 (Appendix F) of Graf Street shows a 3.0-acre portion of Graf that flows north into the temporary pond within SRX-II. The required detention storage from Graf is 3,254 CF. The 25-year flow from Graf Street can be calculated using information from Appendix B as follows: = 14, = 0.78(14/60) !".#$= 1.98 /ℎ’() = * + = 0.75 × 1.98 /ℎ’() × 3.0 .)/ = .0123 SRX-II SUBDIVISION - STORMWATER DESIGN REPORT N:\5659\021 - SWX North Pre-Plat\04 Design\Reports\Stormwater\Text\5659.021_StormDrainageReport.docx Page 5 Basin 1 Total Onsite and Offsite Flows The 10-year storm runoff volumes from South Range Crossing and Graf Street (4,478 CF in total) will need to be retained in addition to the proposed ROW runoff from SRX-II. The piping within SRX-II will also need to convey 25-year storm flows from South Range Crossing and Graf Street totaling 5.57 cfs. Temporary Pond 2 Temporary Pond 2 will include runoff from Sub Basin 1.7 – 1.10. Permanent Pond 1 Permanent Pond 1 will include runoff from Sub Basin 1.11 -1.12 along with all the runoff included from Temporary Pond 1. Permanent Pond 2 Permanent Pond 2 will include runoff from Sub Basin 1.12 -1.13 along with all the runoff included from Temporary Pond 2. 15th Street Ditch Routing The ditch to the west of 15th street has been deemed to only be storm conveyance and not within the purview of the ditch company. Therefore the ditch flows crossing Graf through the 24” storm pipe will be picked up and piped within the 15th Avenue ROW. The flows from this ditch include the overflow from the following subdivisions: South Range Crossing Subdivision & Blackwood Groves Runoff Per the Storm Water Design Report for South Range Crossing Subdivision (Appendix G), overflow from South Range Crossing Ponds B-3, B-4, G-2, P-1, P-2 & P-3 discharge into the 15th street ditch which outfalls to the existing culvert at Graf and 15th. The total peak outflow for a 25-year storm event for the South Range Crossing overflow is 1.89 cfs. Per the Stormwater Design Report for Blackwood Groves Subdivision (Appendix H), overflow from Blackwood Groves Ponds 8A and 8B discharges into the 15th ditch. The 10-year discharge for ponds 8A and 8B are 1.88 cfs, and 4.94 cfs. The total peak outflow from a 25-year storm event for Blackwood Groves can be calculated to 9.14 cfs. The total 25-year storm conveyance along the 15th ditch is 11.03 cfs of treated stormwater. 5 METHODOLOGIES This section documents the methodologies and assumptions used to perform the stormwater runoff analyses for the project. Drainage plan methodologies and analyses are based on the City of Bozeman’s Design Standards and Specifications Policy (Standards). Storm runoff within proposed lots will be captured and treated in separate underground stormwater treatment facilities or retention/detention ponds during site plan designs. SRX-II SUBDIVISION - STORMWATER DESIGN REPORT N:\5659\021 - SWX North Pre-Plat\04 Design\Reports\Stormwater\Text\5659.021_StormDrainageReport.docx Page 6 5.1 Design Methodology Summaries of runoff estimates, and treatment volumes are provided in the sections that follow. The pre-development condition assumed a runoff coefficient of 0.2 based on undeveloped agricultural land. Retention ponds were designed to treat runoff during the post-development condition for a 10-year design storm. Storm drain main sizes were sized to convey the 25-year design storm without exceeding 75% of the full flow capacity (d/D) and utilize the most efficient diameter. A summary of the pre- and post-development runoff volume calculations are provided in the table below. Further detail can be found in Appendix D. 5.2 Design Storm Analyses Stormwater runoff analyses were performed using the Rational Method. The analyses included evaluations of the 10-year, 2-hour design storm for sizing of treatment facility volumes and the 25-year, 2-hour design storm for sizing capture and conveyance facilities. Runoff coefficients were assumed based on expected future surfacing and checked against general development conditions expected as outlined in the City’s Standards. Autodesk Storm and Sanitary Analysis (SSA) software was utilized for the major storm analysis. Various excel spreadsheets were used to calculate rational coefficients, treatment volumes, and time of concentrations. Autodesk Hydraflow Express software was used to determine the maximum gutter conveyance/spread widths at inlets and the corresponding maximum flow to inlets. Detailed calculations and reports are included in Appendix D. 5.3 Storm Drain Capture and Conveyance The storm drain piping system for the proposed development is designed to have maximum reliability of operation, minimal maintenance requirements, and ensure that inlets function to their design capacities while meeting necessary area drainage requirements. The 25-year design storm was used as the basis for design for these conveyance facilities pursuant to the City of Bozeman requirements outlined in the City Standards. Time of concentrations for each major drainage basin were calculated using the TR-55 method. These time of concentration values were used to calculate peak flows for the 25-year storm and size conveyance facilities. SSA analysis results for conveyance of the 25-year storm are provided in Appendix D. The piping was sized to convey expected flows at less than 75% capacity. The model incorporates inflows for low points in the curb line of the roads. Spacing of inlets was designed to be sufficient to capture the expected flows and limit gutter spread. Based on the road design profiles, maximum runoff flows for each road was determined to limit gutter flow depth to 0.15’ below the top of the curb (spread widths less than 9.5 feet). A typical sag inlet was modeled for the site as well. Inlets and pipes were designed to convey peak flows from a 25-year design storm. Additional gutter spread reports are provided in Appendix D. The existing storm main that stubs north underneath Graf was originally designed to convey flow from the entirety of South Range Crossing as well as Graf Street but now conveys a substantially lower flow in a 42” pipe. The storm main within SRX-II will be sized to convey these southern flows as well as the proposed flows described in this report. Given this information the 42” pipe underneath Graf is oversized and will be reduced within SRX-II while still sized to maintain a minimum velocity of 3.0 feet per second (fps) when flowing full to prevent sediment deposition. Due to the 15-inch minimum storm drain main size requirement and 12-inch inlet lateral sizing requirement in the City of Bozeman, some basins do not have sufficient inflow to achieve 3.0 fps SRX-II SUBDIVISION - STORMWATER DESIGN REPORT N:\5659\021 - SWX North Pre-Plat\04 Design\Reports\Stormwater\Text\5659.021_StormDrainageReport.docx Page 7 during the 25-year design storm (especially at the beginning reaches of the basins). Slopes were increased as much as feasible to increase velocities while maximizing cover depths at the required minimum pipe sizes. Due to the high groundwater at the site, the minimum cover depth of 2 feet per the COB Standards could not be met in all cases, however the piping selected has been designed with adequate cover to meet HS-20 loading requirements (or equivalent HL-93 loading). Some stormwater piping may need to be called out to be watertight due to concerns of infiltration in areas of high groundwater. These pipes will be specifically called out in final design drawings on infrastructure submittals. Piping crossing major traffic areas shall be specified to be class IV reinforced concrete pipe if cover is less than 2 feet. Conveyance pipe sizing is tabulated in Appendix D. 5.4 Stormwater Treatment Facilities Most stormwater treatment will be performed using surface retention ponds with overflow piping. All treatment facilities were designed to store runoff from a 10-year, 2-hour storm event for treatment and infiltration. The maximum water depth during a 10-year storm was designed to be 1.5 feet per the City of Bozeman Standards. These facilities are further described below. Surface Treatment Ponds Treatment of stormwater from roadways and 10’ setbacks will be performed using surface ponds as shown on Exhibit ST-1. These facilities will be owned and maintained by the Property Owner’s Association (POA) in accordance with the operation and maintenance manual and shall be accessible using the proposed network of roads or additional access routes as required. These facilities were designed to capture runoff generated from the first ½” of rainfall from a 24-hour storm preceded by 48 hours of no measurable precipitation [Runoff Reduction Volume (RRV)]. Elevation of stormwater pond bottoms were located above the seasonally-high groundwater observed, but in many cases the pond bottom is within 1 foot of the seasonal high groundwater due to grading constraints from existing conditions. The pond elevations were kept as high as possible and during most of the year will provide more than 1 foot of separation from expected groundwater. Year-round saturation at the bottom of ponds is not expected based on their design elevations. Pond capacity will be designed to store runoff from a 10-year 2-hr event from the rights-of-way and pre-development flows from Block 1, Block 2, and Restricted Lot 1. Stormwater runoff will be stored in two permanent ponds in a proposed stormwater easement northeast of the subdivision. Internal Street ROWs Street ROWs were included in Temporary Ponds 1 and 2 for the first phase. The runoff coefficients for each ROW was based on the standard section anticipated and the ratio of impervious areas to pervious areas. These areas and coefficients were incorporated in the overall basin including open space areas (if present) for a combined weighted rational C coefficient. Ultimately, stormwater from the Street ROWs shall be captured using curb inlet structures and conveyed to treatment facilities as shown on Exhibit ST-1. SRX-II SUBDIVISION - STORMWATER DESIGN REPORT N:\5659\021 - SWX North Pre-Plat\04 Design\Reports\Stormwater\Text\5659.021_StormDrainageReport.docx Page 8 Table 1: Temporary Retention Pond Sizing Pond Number Major Basin Required Storage (cf) Additional Offsite Required Retention (cf) Total Required Retention Volume (cf) Provided Retention Volume (cf) T-1 4,426 4,478 8,904 9,485 T-2 2,582 0 2,582 2,667 *Minimum pond bottom elevation is set 12” above estimated high seasonal groundwater elevation. Permanent stormwater retention ponds will be installed in a future phase of SRX-II. Due to the location of the wetlands near the northern boundary, the final location will be determined during the design phase. The minimum pond size for each pond can be found in Table 4. Table 2: Permanent Retention Pond Sizing Pond Number Major Basin Required Storage (cf) Additional Required Retention from temporary basins (cf) Total Required Retention Volume (cf) P-1 1,935 8,904 10,840 P-2 1,535 2,582 4,118 *Minimum pond bottom elevation is set 12” above estimated high seasonal groundwater elevation S 19th Avenue Runoff from S 19th Avenue will continue to be treated in the northwest corner of the property in the existing temporary pond. Lots Storm runoff outside of the ROWs shall be captured and treated in a separate underground stormwater treatment facility or retention/detention ponds during site plan design. Prior to site development, stormwater will pond in the lots and infiltrate due to the road grades being higher than the existing lot elevations. 5.5 Overflow Overflow pathways from the retention ponds will flow north to existing irrigation ditches. Road grades were set to minimize chance of discharging runoff offsite during the 10- and 25-year design storm events. Overflow pathways for Block 1 development will be able to discharge into the ditch along 19th. A stub will be provided for Block 2 overflow and will discharge into the 24-inch conveyance pipe along 15th. SRX-II SUBDIVISION - STORMWATER DESIGN REPORT N:\5659\021 - SWX North Pre-Plat\04 Design\Reports\Stormwater\Text\5659.021_StormDrainageReport.docx Page 9 5.6 Irrigation Ditches A single active irrigation ditch exists on the west boundary of the property along 19th Avenue. This irrigation facility is operated and maintained by the Middle Creek Ditch Company (MCDC) and has active users who use this water. The west ditch is proposed to largely remain undisturbed except for planned roadway crossings where the water will be conveyed using culverts. The remnant ditch along the east boundary of the property (adjacent to 15th Avenue) will be relocated and piped under the 15th Avenue ROW. The property directly south of SRX-II, South Range Crossing Subdivision, maintains the conveyance channel along the eastern boundary to convey any stormwater discharge received from the overflow of the Blackwood Groves stormwater pond outfall structures. 6 MAINTENANCE Storm drain inlets, catch basins, and piping will be inspected at least once per year and following large storm events. Any necessary repair or maintenance should be prioritized and scheduled through the spring, summer, and fall. These items may include inspecting for any damage, removing blockages, cleaning and flushing the length of pipes, establishing vegetation on bare slopes at or near inlets, and sediment removal. Maintenance of retention basins is essential. General objectives of maintenance are to prevent clogging, standing water and the growth of weeds and wetland plants. This requires frequent unclogging of the outlets, inlets, and mowing. Removal of sediment with heavy equipment may also be necessary in 10 to 20 years. An Operation and Maintenance Manual is included in Appendix E. Access easements will be provided to the City for maintenance of the stormwater facilities from ROWs. 7 CONCLUSIONS Runoff from the SRX-II Subdivision will be captured, conveyed, and treated according to City of Bozeman Standards. The facilities are designed to provide maximum reliability of operation and minimal maintenance requirements. Access routes to any storm facilities not accessible from the road will be provided.