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Home My WebLink About013_Bronken Sewer Report_09272021 BRONKEN WAREHOUSE – BOZEMAN SEWER IMPROVEMENTS SANITARY SEWER BASIS OF DESIGN REPORT September 2021 PREPARED BY: MMI #: 2200.048 2 Table of Contents INTRODUCTION ........................................................................................................................................................ 1 1 PROBLEM DEFINED ....................................................................................................................................... 3 2 DESIGN CONDITIONS .................................................................................................................................... 3 3 IMPACT ON EXISTING WASTEWATER FACILITIES ............................................................................... 4 4 PROJECT DESCRIPTION .............................................................................................................................. 4 5 DESIGN CRITERIA .......................................................................................................................................... 5 6 SITE INFORMATION ....................................................................................................................................... 5 7 ENVIRONMENTAL IMPACTS ........................................................................................................................ 5 APPENDICES Appendix A – Typical Wastewater Flows (DEQ 4) Appendix B - USDA Soil Survey Prepared By: Morrison Maierle, Inc 2880 Technology Blvd. W. Bozeman, Montana 59771 Phone: (406) 587-0721 Fax: (406) 922-6702 Written By: RSN Checked By: CMS Approved By: MEE PROJECT NO.: 6314.001 3 INTRODUCTION This design report provides the criteria used as a basis of design for the sewer line proposed to service the Bronken Warehouse. This report is submitted in conjunction with the completed plans and specifications to the City of Bozeman and is organized following the outline recommended in DEQ-2, Chapter 10. Section 11.1, Engineering Reports. The Bronken Warehouse is located off Nelson Rd and Prince Lane on Lot 5A of the Nelson Meadows Subdivision. This project is located within the City of Bozeman, Montana. See the vicinity map for location details. 1 PROBLEM DEFINED This project involves the connection to an existing 6” sewer service stub that ties into the existing 8-inch sewer main along Prince Lane. Sewer facilities included in this project will be designed with adequate capacity to handle the maximum peak hour flow for the within the warehouse that will be used primarily for storage, office space and trucking facilities for shipping. 2 DESIGN CONDITIONS The Bronken Warehouse will be located on property zoned M-1, (Light Manufacturing District) per the City of Bozeman’s zoning map. The capacity requirement for the sewer service is calculated as follows: Proposed Average Daily Flow The proposed Bronken Warehouse will have approximately 20 employees. Based on the Montana Department of Environmental Quality’s Circular DEQ-4. Table 3.1-1 each employee for an industrial building typically generates 13gpd. Assumptions: · Proposed warehouse will have approximately 20 employees · Sewer Flow Rate (employee) = 13gpd / employee Employee Wastewater Flow Rate(employee) = 20 employees x 13 gpd = 260gpd or 0.18gpm Total Wastewater Flow = 260gpd or 0.18gpm 4 Proposed Peak Flow Population = 20 employees Peaking Factor (PF) = (18+(population/1000)^.5)/(4+(population/1000)^.5) Peaking Factor = 4.38 Peak Flow = 260gpd (avg daily flow) x 4.38 = 1,139gpd or 0.79gpm Please refer to the table below for comparison between maximum pipe capacity and proposed flows to see that the proposed piping is adequate. LOT PEAK FLOW (gpm) PROPOSED CONVEYANCE *MAXIMUM FLOW FOR 8” MAIN (gpm) Warehouse 0.79 Existing 8-inch sewer main 346 *8-inch pipe at minimum grade (0.4%) with a roughness coefficient (n) value of 0.013 Predicted Average Daily Flow from Nelson Meadows Subdivision The original water and sewer report from the Nelson Meadows Subdivision estimated the wastewater generation for the proposed subdivision using the City Design Standards (March 2004) which uses an average day flow of 66,691gpd and a peak hour flow of 180gpm for 69.47 acres. The peak hour factor used as a part of the original report was 3.87. Using these assumptions, the predicted average daily flow for Tract 5A is as follows: Predicted Average Daily Flow = (66,691gpd) / (69.47acres) x (5.15 acres) = 4,944gpd or 3.43gpm Predicted Peak Flow = 4,944gpd (3.68) = 18,194gpd or 12.63gpm 3 IMPACT ON EXISTING WASTEWATER FACILITIES The proposed average daily flow and peak flow for Bronken Warehouse is less than the predicted average daily flow and peak flow. 4 PROJECT DESCRIPTION This project involves 58 LF of 6-inch sewer service connecting to an existing 6-inch sewer service stub which ties into an existing 8-inch main along Prince Lane. 5 5 DESIGN CRITERIA Design criteria including average and peak flows as well as sewer depth information were provided in previous sections. The proposed sewer service conforms to the State’s minimum vertical and horizontal separation criteria for sewer services. The proposed conventional gravity sewer system is to be constructed to the City of Bozeman and the 6th edition of Montana Public Works standard specifications (MPWSS). The sewer service shall be 6-inch diameter SDR 35 polyvinyl Chloride (PVC). 6 SITE INFORMATION The project site has been zoned M-1 by the City of Bozeman. The existing site sits within the northeastern portion of Nelson Meadows Subdivision along Nelson Rd and Frontage Rd. The existing soil consists of Blackdog silt loam (Appendix B - USDA, Natural Resources Conservation services, Web Soil Survey). The site is not located in a floodway or floodplain. 7 ENVIRONMENTAL IMPACTS There are no expected environmental impacts from this sewer main extension, as the City of Bozeman Wastewater Treatment Plant has adequate capacity for the proposed development. N 7THNAVE19THNAVE27THNAVE15THNAVEINTERSTATE 90 W BABCOCK ST MAIN STW 235 191 BAXTER LN F R O N T A G E R D 7THAVENOAK STW 27THAVENDURSTON RDDAVISLN INTERSTATE 90 PROJECT LOCATION HARPER-RDPUCKETTSPRINGHILLRDV A L L E Y R D C E N T E R E NAVEFERGUSONNELSONRDengineerssurveyorsplannersscientists 2880 Technology Boulevard West Bozeman, MT 59718 Phone: (406) 587-0721 Fax: (406) 922-6702 VICINITY MAP SCALE:1" = 3000' APPENDIX A Circular DEQ 4 Page 27 of 159 2013 Edition TABLE 3.1-1 TYPICAL WASTEWATER FLOWS FROM COMMERCIAL, INDUSTRIAL, AND OTHER NONRESIDENTIAL SOURCES Source Unit Wastewater Flow, gpd/unit Range Typical Airport Passenger 2-4 3 Automobile Service Station Vehicle Served 7-13 10 Employee 9-15 12 Bar Customer 5 3 Employee 10-16 13 Church Seat 3 (Not including a kitchen, food service facility, daycare, or camp) Church Seat 5 (Including kitchen, but not including a food service facility, day care, or camp) Daycare Child 10-30 25 Employee 10-20 15 Department Store Toilet Room 400-600 500 Employee 8-12 10 Hospital, medical Bed 125-240 165 Employee 5-15 10 Hospital, mental Bed 75-140 100 Employee 5-15 10 Hotel/Motel Guest 40-56 48 Employee 7-13 10 Industrial Building Employee 10-16 13 (Sanitary waste only) Laundry Machine 450-650 580 (Self-serve) Wash 45-55 50 Office Employee 7-16 13 Prison Inmate 75-150 115 Employee 5-15 10 Rest home Resident 50-120 85 Restaurant Meal 2-4 3 School, day: With cafeteria, gym, showers Student 15-30 25 With cafeteria only Student 10-20 15 Without cafeteria, gym, showers Student 5-17 11 School, boarding Student 50-100 75 Shopping Center Parking Space 1-2 2 Employee 7-13 10 Store Customer 1-4 3 Employee 8-12 10 APPENDIX B Gallatin County Area, Montana 50B—Blackdog silt loam, 0 to 4 percent slopes Map Unit Setting National map unit symbol: 56vq Elevation: 4,350 to 5,500 feet Mean annual precipitation: 15 to 19 inches Mean annual air temperature: 37 to 43 degrees F Frost-free period: 90 to 110 days Farmland classification: All areas are prime farmland Map Unit Composition Blackdog and similar soils:90 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Blackdog Setting Landform:Stream terraces Down-slope shape:Linear Across-slope shape:Linear Parent material:Calcareous loess Typical profile A - 0 to 10 inches: silt loam Bt - 10 to 19 inches: silty clay loam Bk - 19 to 60 inches: silt loam Properties and qualities Slope:0 to 4 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.20 to 0.57 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:30 percent Available water supply, 0 to 60 inches: High (about 10.9 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 3e Hydrologic Soil Group: C Ecological site: R044BB032MT - Loamy (Lo) LRU 44B-B Hydric soil rating: No Minor Components Meagher Percent of map unit:4 percent Landform:Alluvial fans, stream terraces Down-slope shape:Linear Across-slope shape:Linear Custom Soil Resource Report 13 Ecological site:R044XS355MT - Silty (Si) 15-19" p.z. Hydric soil rating: No Quagle Percent of map unit:3 percent Landform:Stream terraces Down-slope shape:Linear Across-slope shape:Linear Ecological site:R044XS357MT - Limy (Ly) 15-19" p.z. Hydric soil rating: No Bowery Percent of map unit:3 percent Landform:Alluvial fans, stream terraces Down-slope shape:Linear Across-slope shape:Linear Ecological site:R044XS355MT - Silty (Si) 15-19" p.z. Hydric soil rating: No 50C—Blackdog silt loam, 4 to 8 percent slopes Map Unit Setting National map unit symbol: 56vr Elevation: 4,500 to 5,750 feet Mean annual precipitation: 15 to 19 inches Mean annual air temperature: 37 to 43 degrees F Frost-free period: 90 to 110 days Farmland classification: Farmland of statewide importance Map Unit Composition Blackdog and similar soils:90 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Blackdog Setting Landform:Stream terraces Down-slope shape:Linear Across-slope shape:Linear Parent material:Calcareous loess Typical profile A - 0 to 10 inches: silt loam Bt - 10 to 19 inches: silty clay loam Bk - 19 to 60 inches: silt loam Properties and qualities Slope:4 to 8 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Custom Soil Resource Report 14 Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.20 to 0.57 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:30 percent Available water supply, 0 to 60 inches: High (about 10.9 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 3e Hydrologic Soil Group: C Ecological site: R044BB032MT - Loamy (Lo) LRU 44B-B Hydric soil rating: No Minor Components Meagher Percent of map unit:4 percent Landform:Alluvial fans, stream terraces Down-slope shape:Linear Across-slope shape:Linear Ecological site:R044XS355MT - Silty (Si) 15-19" p.z. Hydric soil rating: No Quagle Percent of map unit:3 percent Landform:Stream terraces Down-slope shape:Linear Across-slope shape:Linear Ecological site:R044XS357MT - Limy (Ly) 15-19" p.z. Hydric soil rating: No Bowery Percent of map unit:3 percent Landform:Stream terraces, alluvial fans Down-slope shape:Linear Across-slope shape:Linear Ecological site:R044XS355MT - Silty (Si) 15-19" p.z. Hydric soil rating: No 450C—Blackdog-Quagle silt loams, 4 to 8 percent slopes Map Unit Setting National map unit symbol: 56sw Elevation: 4,400 to 5,500 feet Mean annual precipitation: 15 to 19 inches Mean annual air temperature: 39 to 45 degrees F Frost-free period: 90 to 110 days Farmland classification: Farmland of statewide importance Custom Soil Resource Report 15 Map Unit Composition Blackdog and similar soils:60 percent Quagle and similar soils:30 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Blackdog Setting Landform:Stream terraces Down-slope shape:Linear Across-slope shape:Linear Parent material:Calcareous loess Typical profile A - 0 to 10 inches: silt loam Bt - 10 to 19 inches: silty clay loam Bk - 19 to 60 inches: silt loam Properties and qualities Slope:4 to 8 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.20 to 0.57 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:30 percent Available water supply, 0 to 60 inches: High (about 10.9 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 3e Hydrologic Soil Group: C Ecological site: R044BB032MT - Loamy (Lo) LRU 44B-B Hydric soil rating: No Description of Quagle Setting Landform:Stream terraces Down-slope shape:Linear Across-slope shape:Linear Parent material:Silty calcareous loess Typical profile A - 0 to 6 inches: silt loam Bw - 6 to 9 inches: silt loam Bk - 9 to 60 inches: silt loam Properties and qualities Slope:4 to 8 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high (0.57 to 1.98 in/hr) Custom Soil Resource Report 16 Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:35 percent Maximum salinity:Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: High (about 10.8 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Ecological site: R044BB030MT - Limy (Ly) LRU 44B-B Hydric soil rating: No Minor Components Beanlake Percent of map unit:5 percent Landform:Alluvial fans, stream terraces Down-slope shape:Linear Across-slope shape:Linear Ecological site:R044XS357MT - Limy (Ly) 15-19" p.z. Hydric soil rating: No Bowery Percent of map unit:3 percent Landform:Alluvial fans, stream terraces Down-slope shape:Linear Across-slope shape:Linear Ecological site:R044XS355MT - Silty (Si) 15-19" p.z. Hydric soil rating: No Anceney Percent of map unit:2 percent Landform:Stream terraces Down-slope shape:Linear Across-slope shape:Linear Ecological site:R044XS690MT - Silty-Droughty (SiDr) 15-19" p.z. Hydric soil rating: No Custom Soil Resource Report 17 9 Custom Soil Resource Report Soil Map 5064300506433050643605064390506442050644505064480506451050643005064330506436050643905064420506445050644805064510493330 493360 493390 493420 493450 493480 493510 493540 493570 493600 493630 493660 493330 493360 493390 493420 493450 493480 493510 493540 493570 493600 493630 493660 45° 44' 3'' N 111° 5' 9'' W45° 44' 3'' N111° 4' 52'' W45° 43' 55'' N 111° 5' 9'' W45° 43' 55'' N 111° 4' 52'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 12N WGS84 0 50 100 200 300 Feet 0 20 40 80 120 Meters Map Scale: 1:1,620 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Gallatin County Area, Montana Survey Area Data: Version 24, Jun 4, 2020 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Aug 3, 2009—Sep 1, 2016 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Custom Soil Resource Report 10