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HomeMy WebLinkAbout14 - Design Report - Norton East Ranch - Wastewater (Outfall Sewer) MOMSON ENGINEERS SURVEYORS i PLANNERS MMERLE INC. SCIENTISTS ----- -- ! 2880 TECHNOLOGY BOULEVARD WEST•PO BOX 1113•BOZEMAN,MT 59771 An Employee-(honed Company OFFICE:406-587-0721•FAX:406-922-6702-www.m-m.net May 28, 2014 Bob Murray, P.E. Engineering Division City of Bozeman P.O. Box 1230 Bozeman, MT 59771-1230 Re: Norton East Ranch Outfall Sewer Design Report Submittal - Revision MMI #5149.007 Dear Bob- Based on your review comments, we are providing additional information regarding sewer loading for the Anderson property and clarification on the pipe capacities and road names contained within the report. The Anderson property is located between Flanders Mill Road and Cottonwood Road on the east and west and Baxter Lane and the Bozeman School District property to the north and south. This property is proposed for a new high school on the portion south of Oak Street and a city sports park on the portion north of Oak Street. For the high school site we have estimated flows based on 1,800 students and a flow per student of 25 gallons per day. The 1,800 students is the approximate size of the existing high school. The 25 gallons per day value is from Circular DEQ-4 published by the Montana Department of Environmental Quality. This results in a daily average flow of 31.25 gallons per minute. The peak flow is estimated to be 113 gallons per minute based on the peaking factor of 3.62 for the 1,800 student population. The peak flow is estimated to be 101 gallons per minute utilizing the 3.22 peaking factor associated with the Baxter Meadows Lift Station. Expected flow from the proposed Sports Park is estimated based on information from the Bozeman Sports Park Application for the Bozeman Trails, Open Space and Parks Advisory Committee Dated January 31, 2014. According to the proposed budget, the building for restrooms, concession and maintenance is 2,600 sf. This is the only facility shown that appears to require sewer service. Based on an assumed layout of the building and assuming the male and female restrooms both have 15 stalls, this would require 1,400 sf leaving 1,200 sf for concession and maintenance. Based on other venues, we think this is a conservatively high assumption for the number of stalls. Assuming during peak use each bathroom use is 5 minutes the maximum uses per hour would be 360 uses. Low flow toilets use 1.6 gal/flush and hand washing used 0.5 gal/wash. An additional flow of 200 gallons per peak hour is assumed for the concession and maintenance facility. The expected maximum hourly flow is computed to be 956 gallons per hour or 16 gallons per minute. N:\5149\003\Design Report Addendum Letter to C0E4.doc Providing resources in partnership with clients to achieve their goals An Equal Opportunity Employer 1 ENGINEERS ` MORRISON SURVEYORS I , PLANNERS MAERLE, INC. SCIENTISTS 2880 TECHNOLOGY BOULEVARD WEST•PO BOX 1113•BOZEMAN,MT 59771 An Employee-(hvned Company OFFICE:406-587-0721•FAX:406.922-6702•www.m-m.net These two uses total 117 gallons per minute. Adequate capacity exists in the proposed 21", 27" and 15" pipes for these uses. The impacts that these flows have on the downstream facilities are as follows- • 12" Line in Ferguson (Refer to Table 1 in the design report) This line has adequate capacity to serve both the Norton Lift Station and the Anderson property uses. ® 15" Line in Ferguson (Refer to Table 2 in the design report) The proposed upsizing of this line from 15"to 18" provides 800 gpm in capacity that would be available for Norton and the Anderson Property. This is less than the 867 gpm jestimated peak flow from the two properties. Upsizing the line to a 21 inch would provide plenty of capacity. a 18" Line in Cattail (Refer to Table 3 in the design report) This line has adequate capacity to serve both the Norton Lift Station and the Anderson property uses. • Baxter Meadows Lift Station (Refer to Table 4 in the design report) The additional 117 gpm from the high school and the sports park will need to be added to the upgrades of the Baxter Meadows lift station. The total required capacity will be 1,975 gpm while the existing station is sized at 1,700 gpm. All references to pipe capacity in the design report are based on 75% full which is based on the City of Bozeman's Design Standards. All references to Deadman's Gulch should be changed to Cattail Street to reflect a change in street names since the Baxter Meadows lift station project was completed. Please contact me if you have any questions. Sincerely, A MORRISON-MAIERLE,INC. James-Nic elson, P.E. Project Manager Cc- Kevin Spencer N:\5149\003\Design Report Addendum Letter to COB.doc Providing resources in partnership with clients to achieve their goals An Equal Opportunity Employer Vdi t MORRISON W® MAIERLE, INC, ' An Employee-Owned Company WASTEWATER DESIGN REPORT tNORTON EAST RANCH OUTFALL SEWER BOZEMAN, MONTANA May 2014 Prepared For: Norton Properties, LLC 1 63020 NE Lower Meadow, Suite A Bend, OR 97701 Prepared By: ♦_t-{JCL:.""'"'_'! ....,k Morrison-Maierle, Inc. 2880 Technology Boulevard West Bozeman, Montana 59718 JAMES R. k4c r NICKELSON fx- 9063 P.E. '1AJ NAL NA5149\003\Reports\Wastewater Report Cover.docx ' Table of Contents ' Design Report ort tAppendix A—Baxter Meadow Service Area Wastewater Flows ' Appendix B—Baxter Meadow Lift Station Information ' Appendix C—Norton East Ranch Lift Station Information ' Appendix D—Vicinity and Layout Maps Appendix E—Excerpts from Bozeman 2007 Wastewater Facility Plan ' Appendix F—City of Bozeman Capacity Letter I ' NORTON EAST RANCH SEWER OUTFALL ! ' DESIGN REPORT WASTEWATER COLLECTION DESIGN Introduction ' This report provides a basis for the design of the Norton East Ranch Sewer Outfall for Norton Ranch Subdivision wastewater collection system. The wastewater collection system serving the proposed project was designed and will be installed in accordance with the Montana Department of Environmental Quality (MDEQ) Circular No. 2; Montana Public Works Standard Specifications (MPWSS);the City of ' Bozeman Modifications to MPWSS; and the City of Bozeman Design Standards and Specifications Policy. In accordance with the City of Bozeman Design Standards and Specifications Policy and Montana Department of Environmental Quality (MDEQ) Certified Checklist Requirements,this report is being submitted for approval, by the City of Bozeman and ' MDEQ, prior to or concurrent with plan and specification submittal. The applicant intends to utilize the self-certification process provided for in the City of Bozeman design standards. ' 1.11 Problem Defined When Norton Ranch Phase I was approved,the City of Bozeman placed a restriction on the rate effluent was discharged into the City's existing collection system. This necessitates the need for additional infrastructure to increase the collection system capacity downstream of the tie-in location. The additional infrastructure includes changes ' to existing 4"and 6"force mains from the existing Norton Ranch Lift Station and a combination of new 15", 21", and 27" gravity sewer mains. The new gravity sewer mains will tie into the existing City of Bozeman collection system and flow through the Baxter ' Meadows Lift Station. 1.12 Design Conditions Norton Ranch Expected flow from Norton Ranch Subdivision at full build out was determined to be 750gal/min per Sanderson Stewart Lift Station Design Report for Norton Ranch ' Subdivision, 2009. This flow rate was used in the design of the new infrastructure. Baxter Meadows Lift Station ' Wastewater flows, at full build out for the existing Baxter Meadows lift station service area, was determined. Wastewater generation was based on a combination of platted lots, zoning for undeveloped areas, infiltration, and actual flows for Chief Joseph Middle ' School. The City of Bozeman Design Standards were used for calculating flows. A combination approach, rather than an approach strictly based on population, was ' necessary based on undeveloped areas within the service area. All calculations were ' based on a Mannin 's n value of 0.013 and pipes flowing ° g p p gat 75/o full per City of Bozeman Design Standards. Within the service area a total of 453 lots are platted with an assumed 2.11 people per lot ' using 89 gal/person per day resulting in an average flow of 85,069 gal/day. The assumed values are from the City of Bozeman Design Standards. ' Areas platted for future development were broken down based on the City of Bozeman Zoning Map and total future expected wastewater flows calculated at an average flow of 382,969 gal/day. ' Infiltration was calculated at 83,562 gal/day using total service area acreage and City of Bozeman Design Standard Infiltration rates. ' Current flow for Chief Joseph Middle School, per design engineer communication, was noted at an average of 1,380 gal/day. ' A combination of these individual flows resulted in average day total of 552,980 gal/day passing through the Baxter Meadows lift station. Using the below peaking factor, for the ' flow expected due to the number of lots and zoning, the peak flow was determined as 1,595,088 gal/day ' A peaking Factor was calculated using the following equation: Qmax/Qa,g=(18 +P'/z)/(4+PU2)= 3.22 Where: Qmax=Maximum flow predicted ' Q,g =Average daily flow P =Population in thousands Population was determined based on average flow due to platted lots and zoning using the following equation: P =Qa�g/89 gal/capita day= 5,274 people ' 1.13 Impact on Existing Wastewater Facilities As the proposed sewer lines join existing lines,there will be impacts to existing infrastructure. Minimum slope values were determined from record drawings as submitted to the City of Bozeman. ' At Ferguson,where the proposed infrastructure joins existing infrastructure,the proposed project flows into a 12" sewer line. Calculations based on minimum pipe slope and ' expected flows, for currently platted development, at full build out determined the excess capacity in the 12" line is 950 gal/min. This is greater than the 750 gal/min due to Norton Ranch Subdivision at full build out. See Table 1. ' Table 1. Impact On Existing n 12" Line i Ferguson Ave. ' Existing Peak Flow in 12" Line Infiltration 38,535 gal/day Flow expected due to#of lots and 473,655 gal/day zoning Total 512,190 gal/day ' 356 gal/min Min Slope 0.802 % ' Line Capacity 1,306 gal/min Excess Capacity 950 gal/min The existing 12" line transitions to 15"at Equestrian Lane. Calculations based on minimum pipe slope and expected flows, for currently platted development, at full build out determined the excess capacity in the 15" line is 196gal/min. This is less than the 750 ' gal/min due to Norton Ranch Subdivision at full build out. A portion of the 15"line has slopes that allow for the addition of the full Norton Ranch flow. The 938 ft section of the 15" line would need to be upsized to 18"to convey the Norton Ranch flow. This section is located between Kimberwicke Street and Deadman's Gulch. Once upsized to 18"the line will have an excess capacity of 800 gal/min. See Table 2. ' Table 2. Impact On Existing 15"Line in Ferguson Ave. and Deadman's Gulch Existing Peak Flow in 15" Line ' Infiltration 62,201 gal/day Flow expected due to# of lots 1,043,291 gal/day and zoning Total 1,105,491 gal/day 768 gal/min ' Min Slope 0.133 % Line Capacity 964 gal/min Excess Capacity 196 1 gal/min Upsize to 18" Line(Kimberwicke to Deadman's Gulch-938 L.F Min Slope 0.133 % Line Capacity 1,568 gaUmin ' Excess Capacity 800 gal/min ' The existingline becomes an 18" line in Deadman's Gulch. Calculations o s based on minimum pipe slope and expected flows, for currently platted development, at full build out determined the excess capacity in the 18" line is 1500 gal/min. This is greater than the 750 gal/min due to Norton Ranch Subdivision at full build out. See Table 3. ' Table 3. Impact 'On Existing 18 Line m Deadman s Gulch Existing Peak Flow in 18" Line Infiltration 83,562 gal/day Flow expected due ' to# of lots and 1,511,526 gal/day zoning Total 1,595,138 gal/day 1,108 gal/min Min Slope 0.368 % Line Capacity 2,608 gal/min Excess Capacity 1,500 gal/min ' Impact on the existing Baxter Meadows Lift Station also was investigated. The lift station was designed for 3 pumps,with one as a backup pump. The available pumping capacity of the Lift Station is 1,700 gal/min. The flow expected for full build out of the current Baxter Meadow Lift Station service are is 1,108 gal/min. This results in an excess capacity of 592 gal/min. ' Lift station and force main design information was obtained from the Baxter Meadow Subdivision Lift Station Specifications and/or the Baxter Meadows—Phase I As-Builts. ' Both documents are by Allied Engineering. Table 4. Impact On Existing Baxter Meadows Lift Station Existing Baxter Meadows Lift Station Number of Pumps 2 Flow per pump 850 gal/min Total Pump Flow 1,700 gal/min Exist Flow 1,108 gal/min Excess Capacity 592 gaUmin The existing wastewater facilities will provide for 196 gpm of capacity to serve the ' Norton East Ranch development. The current capacity of the Norton East Ranch lift station is 121 gpm and will be upgraded to 750 gpm at full buildout. The following Baxter Meadow Subdivision sewer improvements will need to be modified in order to i ' provide the full 750 gpm capacity needed for Norton East Ranch: • Upsizing the existing sewer main located between Kimberwicke Street and Deadman's Gulch from a 15" line to an 18" line. (938 feet) • Upsize the pumps in the existing Baxter Meadow Lift Station. ' 1 It is anticipated that these improvements will be phased in as the Norton Eat p p p s Ranch is developed. ' 1.14 Pro'ect Description The project area lies within the planned service area of the City of Bozeman's sewer collection system. Wastewater from Norton Ranch Subdivision flows to the existing Norton Ranch Lift Station, as detailed in the Sanderson Stewart Lift Station Design ' Report for Norton Ranch Subdivision, 2009. This lift station is sized to handle 750 gal/min,the expected flow at full build out of Norton Ranch Subdivision. ' From the Norton Ranch Lift Station the wastewater flows through 4" and 6" force mains. This project proposes to realign, maintaining the existing grade,the two force mains to tie into a proposed force main drop manhole at the intersection of Durston Road and Cottonwood Road. The proposed gravity line in Cottonwood Road was designed as a 2 1" line. The design ' was based on the peak flow from the 2007 Bozeman Wastewater Facility Plan. The Facility Plan shows this line as an 18"; however,the slope of the line in the facility plan is 1.5% while the topography does not allow the line to be installed steeper than 1%. The gravity line in Cottonwood Road flows to a proposed 27" line in Baxter Lane. The 27" line goes from Cottonwood Road to Flanders Mill in Baxter Lane. At Flanders Mill the 27" line transitions to 15". The 15" line flows to existing infrastructure at Ferguson. The 15" line was designed based on a slope of 0.0015 ft/ft flowing at 75% full with Norton Ranch flow of 750 gal/min. The portion sized at 27" is sized based on the 2007 Facility Plan. Table 5. Pro osed sewer pipe line capacity 2007 Facility Min Capacity at Norton East Plan Peak Flow Slope 75%Full Ranch Flow Requirement ' (%) al/min) ( al/min) ( al/min 15" 0.15 1024 750 n/a 21" 0.5 4,585 1 750 4,210 27" 0.15 4,908 1 750 4,210(note 1) Note 1: The 2007 Facility Plan peak flow for this line is 8,136 gpm. The City Engineer has recommended that the line being installed with this project be sized only for the flow from Cottonwood as the depth of the line in Baxter Lane is not adequate ' for it to serve property to the west of Cottonwood. 1.15 Drawings Drawings are submitted with this Engineers Design Report,please reference them as needed. ' 1.16 Design Criteria All infrastructure will be designed and constructed in accordance with the standards ' contained in the Montana Public Works Standard Specifications (MPWSS), 6t'Edition; the City of Bozeman Design Standards and Specifications Policy, March 2004; City of ' Bozeman Modifications to MPWSS, March 2011; the Montana Department of Environmental Quality (MDEQ)Design Circular DEQ-1 and any addenda thereof. The City of Bozeman will assume operation and maintenance of the wastewater and water I ' systems and appurtenances upon construction and acceptance of the installation. All typical manholes will be 60" diameter with flat top sections. Manhole spacing will be I ' at a maximum interval of 400' on the 15"pipe and 500' on the 21' and 27"pipes. A 12' wide gravel access road will be constructed to provide access to sanitary sewer manholes not located within paved roadways, as needed. 1.17 Site Information ' The topography in the area of the proposed Norton East Ranch Sewer Outfall is generally sloping to the north at 04% slope. The soil primarily consists of loamy soils. Bedrock, and any other limiting layer is found at a depth greater than 80". Depth to saturated soil varies from 18' to deeper than 80". Flooding in the proposed project location rarely occurs. All site information is from the Natural Resource Conservation Service Soil Survey. ' 1.18 Alternative Selection/Analysis. The described alternative was chosen based on the Lift Station Design Report for Norton ' Ranch Subdivision by Sanderson Stewart, 2009,report that was approved by the City of Bozeman. The report required the addition of sewer infrastructure for phases beyond Phase I per City of Bozeman restrictions. The construction of the proposed infrastructure ' is approved by the City of Bozeman and included in the long term city development plan. 1.19 Environmental Impacts ' Environmental impacts are expected to be limited to the disturbance of an existing wetland area. This disturbance will be permitted as needed by all applicable laws. Construction of infrastructure that will disturb this area is due to the future proposed ' Baxter Lane road section and the City of Bozeman requirements. During construction all applicable means will be used to mitigate the environmental impacts due to construction. Appendix A Baxter Meadow Flow 1 1 1 i1 1 1 1 ® 1Y OMSO1V ElOu MAIERLE,INC. memo An Employee-Owned Company TO: James Nickelson ' FROM: Jodie Binger RE: Baxter Meadow Service Area Wastewater Flow DATE: April 21, 2014 Wastewater flows, at full build out for the existing Baxter Meadows Lift Station service area, were determined. The flow was determined based on: ® Number of platted lots ® Zoning for areas platted for future development ® Infiltration ® Actual flow values for Chief Joseph Middle School ® City of Bozeman Design Standards for zoning densities and infiltration See attached service area map to correlate following table values with service areas. Within the service area a total of 453 lots are platted with an assumed 2.11 people per lot using 89 gal/person day resulting in 85,069 gal/day. (See Table 4) The design values are from the City of Bozeman Design Standards. Areas platted for future development were broken down based on the City of Bozeman Zoning Map and total future average expected wastewater flows calculated at 382,969 gal/day. (See Table 2 and 3) The other use is the Chief Joseph Middle school which as an average day flow of 1,380 based on water use data. Infiltration was calculated at 83,562 gal/day using total service area acreage, 557.1 acres, and City of Bozeman Design Standard infiltration rates. A combination of these individual flows resulted in a total of 552,980 gal/day on average. Using the City of Bozeman Design Standards a peak flow of 1,599,782 gal/day was j determined based on a peaking factor or 3.22. Table 1. Total wastewater flow through Baxter Lift Station Existing Average Flows to Lift Station Due Existing Peak Flows to Lift Station Due to to Baxter Area Developments as Platted Baxter Area Developments as Platted Infiltration 83,562 gal/day Infiltration 83,562 gal/day ' Flow expected due Flow expected to#of lots and 469,418 gal/day due to#of lots 1,511,526 gal/day zoning and zoning Total 552,980 gal/day Total 1,595,088 gal/day i r Table 2. Lots and future development for Baxter Lift Station service area ' Future Development Zoning (acres) Plat Name Lots R1 R3 R4 RS B2 PLI 1 Plat of Minor Subdivision No 400 7.00 12.47 Baxter Meadows Subdivision PUD Phase 1 105 4.77 1.00 Baxter Meadows Phase 4A 34 Diamond Estates Subdivision No 2 Phase II 42 Crossing 2 Subdivision 74 7.17 Certificate of Survey No 2202 1.38 Tracts A and B of the Amended Plat of Baxter Meadows Subdivision PUD Phase 1 Tract 1A 28.99 Certificate of Survey No 2202E 99.70 Amended Plat OF Baxter Meadow Subdivision PUD Phase 1 Tract 1 25.74 t Baxter Meadows Subdivision Phase 3A 74 Certificate of Survey 2202C 12.30 41.98 39.37 W9 Baxter Meadows Subdivision Phases 2C& 2D 51 Baxter Meadows Subdivision Phase 6 48 2.19 Baxter Meadows Subdivision Phase IIA 25 0.44 Book 148 Page 207 2.29 Flanders Mill Zone Map Amendment 65.57 10.49 4.96 Total 453 58.40 1 96.81 52.47 1.00 54.47 104.66 ' Table 3. Average Day Flow for Land Uses Zone Dwelling Per Acre Gal/Acre/Day Gal/Day R-1 3.9 730 42,634 ' R-3 6.5 1220 118,110 R-4 10.4 1950 102,313 R-S 6.5 1220 1,220 B-2 200 10,893 PLI 1030 107,800 Total from Zoning 382,969 Table 4 Average Da Flow for Lots Number of Lots units People per unit Gal/Day/Person Total Flow 453 2.11 185,069 ■ ■- ■IIEIE IIII ta►� a . ►. INHIBITION �t■�■1 . �a■ll■m■■■■■■■i■■ ■■■1■■■�I■I■■■ ■ ������ -_ : I !fmmmmml IMMUNE mill ►AAAo.► " Mill ►`;'� ►o�,,.; ,,• �w.1.3�.��. 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'■ Ilumummnm � � ; ' MINI ' ■ IIIIIIIIIIIIIIIIIIII 1-� I IIIIIIIIE 11111111 �I�■ IIIIEI♦ 1 %mil����� ■/■� Imo■■ ■IIIII III �: � SON 1 IIII 1■� 1�111 �IIN � 7 • ■111111111 IIII � 1�1�1 Appendix B Baxter Meadow Lift Station 1 1 1 I ' 1 1 1 t 1 ® MORRISON EIE]d MAIERLE,INC. memo An Employee-Owned Company TO: James Nickelson ' FROM: Jodie Binger RE: Existing Baxter Meadow Lift Station DATE: 12/17/2013 The existing Baxter Meadow Lift Station is located on West Oak Street. An area of 557 ' acres is serviced by the lift station. The lift station feeds a 12" SDR 21 PVC force main. The force main is 1,203 ft long and connects to a gravity collection system in Davis Road. The lift station has three (3) 4" Flygt CP 3127.090 10HP Pumps. Each lift station 1 pump was designed to produce 850 gpm at 35 feet TDH with a minimum efficiency of 35%. The pumps are located at an approximate elevation of 4648 ft. and the elevation of discharge into the gravity line is 4667.84. Lift station and force main design information was obtained from the Baxter Meadow Subdivision Lift Station Specifications and/or the Baxter Meadows — Phase I As-Builts. ' Both documents are by Allied Engineering. The As-Builts for the lift station are attached. 1 I a MDEQ Project: 01-241 Baxter Meadows Subdivision April 3, 2002 F=(18 +P")/(4 +po"s) Where: ' F=Peaking Factor ' P=Population(in thousands) F=(18+ 10.10.5)/(4+ 10.10:5 F=2.95 ' The peak hourly flow rate is then estimated to be 506 gal/min * 2:95 = 1,493 gal/min. A peak hourly flow rate of 1500 gpm will be used for all calculations. ' The proposed lift station will consist of three identica1.15-HP submersible pumps. The.peak hourly flow will be handled with any two pumps,while most flows will be handled with a single pump. All three pumps will be situated inside an eight-foot diameter concrete manhole with a ' total inside depth of approximately 21 feet. The pumps are sized to service the peak flow with the largest pump out of service. A separate valve vault will be provided which will also be eight foot diameter and have a total . . inside depth slightly greater ;than ten feet. . The pump discharge assemblies will be` six-inch. ' diameter. Inside the:valve.pit, all three pump discharge assemblies will be-connected together 1 with a six-inch cross. The force mains.will then transition to 12-inch diameter PVC SDR 21 pipe, and will be approximately 1140 feet in length until it discharges into"a gravity sewer at the intersection of Dead Man's,Gulch,and Davis Lane: Additional features of the lift station include: ', ♦ Permanent backup power generator; ♦ Ultrasonic level sensing(in lieu of floats); , ♦ Continuous monitoring by a SCADA.system in the City of Bozeman shop. ' Pump Sizing. DEQ 2 requires the lift station pumps to meet the P eak hour demand with the . . P largest pump out of service. .If'all three pumps'were the-same size, each ,pump would need to have a capacity of 750 gpm.' DEQ 2 also -requires use of the Hazen Williams equation to estimate pipe friction (C value of 120). The pumps specified have a discharge of 850 gpm at 34.8 TDH: The maximum _ .. , • m mum total dynamic head for each pump is calculated as.follows: Friction: 251.f, of 6"ductile iron @.850 gpm, C=120 1.6 feet _ 114011 of 1T'PVC @ 1700 gpm, C=120 . 9 feet. ' Elevation: from LWL-to discharge into gravity sewer 17.2 feet • Minor Losses: 3-6"90 degree bends @ 850 gpm(K=0 9) L9 feet . 1"-6"gate valve @ 850 gpm(K=0.19) 9.3 feet S.lProjects12001101-241 Bauder MeadowsigZiZesgondencelRyan Leland 3-18-01.doc ' Allied Engineering Services,Inc. Page 3 LI NOP.TpI FOGF •'.F 10' 7. 20`'.SIDE COR M P 4 CxAAT 'iE Ot R 1.1 A'N *41VEL ROAD .Eh 5p.ills F-5 A 5-6) DEADNLAVS GULCH -W, %RZI ':-V FAR! SPJAi? VAN ' � ��j`• [7)(ISTING r--!qcr RELC,A'ED 59 75 V 07 is, soa 35 WIPE GRAVITY SEWER MAI" (SEE -,Hce-, s I uFT S!Ayir,,k SOUTI,UWL GF W RICIiT-fIf-WAY WET WELL (SEE -AFF I t11 24" MIN ' t fiF.N?RA!CN 15'SOR 3S PVC STUB W/ RE MGM&E. PAD 57,-0- ENO PLUG $WON GENERATOR BUILDING rJEWERNG PIPE LEPI W VL-AGE BY WILLIAMS GRA',j:j. ERI.JVVAy PtUMBING AND IIEAIING AS-BUILT SEIVER LNE EASEM-,-NT LINEAR PARK DESIGN BY (RPA) OPEN SPACE AS--BUILT By AESf N BY WE 0 to 20 3.1 PRQXCT #: 01-241 sHwr AV -)WS DAT—E. 04/05/04 BAXTER MEAD( PHASE I - AS-BUILT Civil Engineering 32 VIS(COVERY DRIVE 90ZL%to,hff 59718 S-AS-LIFI`STATION.M�V S-9 SCALE: I INCH LIFT STATION SITE PLAN Land Surveying PHONE(4061592-0221 ON-ERALL SMET OF PROJECT 'IA ALLIED Cwotcchni.al EngincM i ENGMEERM0 ng BAXTER LIFT STAT1654—­ _��O_ ENGINEER: 11, 11", FAX(40)."MTM . ........ B0ZHMikN,MONTANA DIMSAIED BY.- JJM IREMEWED BY; SRS $MpLkN �I AV.lui •r u. F ���_ '*VET� MI. SKIRT, "FT 'siA"GN FGR t iTHft1- i a,. AM1!1Li T•!.!. ,d•12 GLLf NL+!A t , r:a, f:.EV. - =r>1?.L1 rreT _�_�1_� F°It➢l,'cG IIRv.tNO ---- -- 1 titkY /CACl t, � LF r:R1"FN -rcN t - nra,. 9�a,L+:F 1 '__.__._ ChyiROL/h"CI1rFH • -. RFN�IT:{1N i0 CABLLS '0 +2-PVC SDR21 '1 .u;NCT,G4 96;4 D;CLASS 5' I .. "ORCE!AA:fJ I." lit ri CLASS 5� IY 4'.£tFfl). MJ rp6LF +' 9M7.. fAC,A-LUGS K Ste. :;r+15 1 ._A O! OROf MA+N / •• M ' � ', I E. - 4653 0 FECT 11 Vl''-1w tir1C MANHUiF n. t 0, 'HR!iST?LBCK PER C'Tv �\ I ; ,FANTiARi3:; (iVHCA1} 'A AN" 1 - *'•'.E t AbAHDONJD 27 PVC DRAW PIPE. PLUGGLV &Trl GROUT ANC CAS:0 AT LNDS 114t1' �; LEAI ..JViN,)At HATCH FINISHED VIE_W 1 CALLOUTS i (�•) 4'F'Yi1 CP3111:;a0 10 HP PUMP WET,WELL 02 6" 01 90' TILER/UN*4 SEND,F_ ._. ) V DI RCIJAC KLANGEG• END :DAP44,It. 6" C! 5M;1t,-EiLA:R 441 COUPLING 1104 WA'ER ALARM — --4- !. f al LLEV. > 4654.E'1 "LEE (5 •?" C+ 30' PRER/JWON KENO, FL a 2 •9' Z-.GK lAs PAVP"ck4, --S - ! } r:kd•FC,T!"OR ORAr, W/CNEGK VAI�,i r',AS:f"i ELEV = 465392 ' , CONCRL IE S+FLF SLOY•NG PUMn 1 "Ot,•' (>`) 4" r 1'f3 T kER A,NN;A�i RECUCFK 10 5' OAY.E T.R HOPPER ---- — - E �. 6'52 7 FEET AT 1•f SIDPEE'Ev 1 •16rs282 "'' 4 ` WEE'Ili LEAD"W;- 'ON- ELEV. a 4EE'.62 t t LLEv. 4672.69 iEnT K,� !A ELEV. 4672.14 FEET PUMP 'CK'F'E1 EV. 4-349.82 - --i-- _ P GPr-U :IliR<' 4010A)AN; "OFF" 6, LUX t;LTNCRE TE WA-ER ALARM !� - ~.`!r CURB AT A I `✓` 4549 S2 ----f �-.- 51,.E8" PVC SDR 35 - c'o - } 1_ VC ,f:N :t1T� �S1 � MANHO..�LCOH - tfi' A'VE 15" ;NYE Ei.EV 4647.82 BEET ! _ 18"Z-LOK +S' L-LOn -1 Z tg f� S'LYAMETER FLAT f CASKEI C�.S<T r ` HOPPER SOTTCM t �� 0• M. 10•C,A .,- �; �_ __,.E. 4r;5582 I.. a t65`.bE 6'CLASS 51 WET , _--- �OHCE MAiN(TYn,CAt.) A SECTION s r-LGK 15" z-LLVf IF 4tS5.6r ELECTRICAL 8.1 LIFT STATIONS _ GASVEt CASKE,7 1 JUNCTION 30X NOT TO SCALE NON-S.R1NK �+ F 15" Z-LON 4" PVC ELECTRh,Al F! BLE n!,L __ s - LOWAEItE F1:1. GASKET GtNEQ T(RGA1 E.=46.7 57 f;l NeRgtON 9U�t:?,Nt) 113" <;'OENU FLOfiR LIEV.- 15" 45'9ENC+ !4647.92 'JUR W/ 4EMO•:A6I.E EXPOSEDVIE�V EN'+WG (COtf HS NOT SHOWN/+DR%ANIT'i; I ' LIFT STATION r ' DETAIL -- sn IN'_ET 5-11 LIFT STATION,PLAN VIEW z,DETAIL NOT TO SCALE { 41 i-fJ FTSTATIOrTL`v'I.ET------ j - 1 U NOT TO SCALE ' PUMPUI'ER 411CN AND ALAK\1S tU BE C@'t Tk_+.'.EL E7Y :L1RA5GN!C LEVEL SENSOR AS-BUILT CONCkE Tk MANHCi ES MANUFACTURE!) "r}A511A r.-416 S+f CE:. c{Es1f N By (Rpa) A5—aUII.1 BY AES1 'it\9SION5 CRAWN SY 7ArE "TR4 PROF-CT J., 01-241 ;GA:T A4 NOTET7 BAXTER MEADOWS e PHASE I - AS-BUILT '�j�+■• R YVWVk GATE:�/�5/04 S-11 : ► civil rng;,Eeer;ng 32WCOVE '+ BUZEVLIN,MT 3971tl 5-AU-LIFT5TA i3ON w• LIFT STATION SITE PLAN Land Surveying ---- ---- ---- PHONE 1406t592.0221 PROJECT ENGINEER::AT DRAWN EiY, IJG ; ALLIED GenteeWcal En ineerin FAx 061512-S770 '- _ f} "'`' j BOZE NNT,MONT1�.LNA ENGINEERING g g E _—`BAI TER MEADOWS OESGN£a Sri .1.•M RE\SEWED 0Y. SRS� o ..—. a:,,.C. S-AB-FORCE KAIN Appendix C Norton East Ranch Lift Station 1 1 1 1 Table 1—Norton Ranch Future Development Area, Zoning, Population, and Avers a Da lllastewater Flow Ave.Day Ave. Area Dwelling DwellingPopulation Day Zoning (ac) Unit Duty Unit Duty Population Q Flow QwW (du/ac) (per./du) Duty Flow (gPd/ac) (gpd B-P 24.63 5.2 128 2.11 270 960 23,645 R-0 63.59 5.2 331 2.11 698 980 62,318 R-3 52.84 6.5 343 2.11 725 1,220 64,465 R-2 21.00 5.2 109 2.11 230 980 20,580 R-4 39.97 10.4 416 2.11 877 1,950 77,942 Total 202.03 1,327 2,800 248,950 Based on a future phase population of 2,800 in combination with the estimated population from Phase I, the total population of the Norton Ranch Development at full build-out would equal 3,463. From Eq. 1.0 the peak hourly to average day wastewater flow ratio would equal: peak bou,yIQam,,y= (18+3.4630-f)/(4+3.463°'5) = 3.39 Therefore, the domestic peak hourly flow would equal: (248,950 + 58,966) *3.39 = 1,043,835gpd(725gpm) The required allowance for infiltration inflow to be added to the design flow equals: (39.84 ac + 202.03) * 150 pd/ac= 36,281&�d(25gpm) Therefore, the total design flow that the lift station capacity must satisfy at full build-out of the subdivision equals 750 gpm. 4. LIFT STATION CONFI GURATION 4.1 Pumping Units The lift station will consist of a wet well utilizing submersible wastewater pumping units with discharge piping running to a generator building that houses both the control valves of the discharge piping as well as a backup diesel-fired generator and transfer switch. The lift station wet well shall use a to-plex pumping unit configuration (3 pumps). For the first phase, the firm pumping capacity (capacity with the largest pump out of service) needs to equal 121.5 gpm as discussed in Section 2 above. Therefore, two pumps rated at 121.5 gpm shall be installed. As subsequent areas are being proposed for development, a third 121.5 gpm pump may be added,or two or three new pumps P.B0Z_07004_05_Eng Rprt 3 (03/22/10)CN/tsc of greater capacity may be added to satisfy the needed pumping capacity requirements. The actual firm pumping capacity for any particular set of g p pum in units is dependent upon the discharge conditions present,which changes total dynamic head conditions and the rate at which the pumps will operate. These discharge conditions; specifically, the use of dual force mains of different sizes as discussed below,provide for the option of producing several different station pumping capacities using the same pumping unit set as discussed further in Section 4.2. The future configuration of the lift station in terms of the pumping unit sets will be dependent upon the nature and size of subsequent phases of development. 4.2 Force Mains Dual force mains will be utilized to convey wastewater from the lift station to the tie- in location with the City of Bozeman collection system. The use of dual force mains was necessitated by the wide range of design wastewater flows that may be present as Norton Ranch is developed. The rate of these design flows varies between the initial Phase IA design pumping rate of 62.2 gpm; the Phase I design pumping rate of 121.5 gpm;or the estimated design pumping rate of 750 gpm at full build-out. By using either, or both, of the 4-inch diameter and 6-inch diameter force mains, the minimum 2 feet per second (ft/s) wastewater flow velocity requirement and 10ft/s maximum velocity guideline can be maintained in the force mains during any operating scenario except Scenario 3, and the wide range of design wastewater flows can also be potentially satisfied using a single set of pumping units. Since the ' minimum flushing velocity cannot be maintained in Scenario 3, utilization of this operating scenario is not recommended. As is summarized in Table 2 below, the variation in the total dynamic head created when pumping into the different combination of force mains effectively shifts the operating point of the pumping units and provides for a significant variation in discharge rates depending upon the pump and force main scenario. For example, a firm pumping capacity of up to 206 gpm can be provided by the initial set of pumping units when utilizing both the 4-inch and 6-inch diameter force mains. (see Scenario 2, Tble. 2). A pumping capacity of 206 gpm is equivalent to the design flows from approximately 411 dwelling units. (Table 3). P:BOZ_07004_05_Eng_Rprt 4 (03/22/10)CN/tsc L b Table 2—Lift Station Confi uration and Corresponding CorresponqLng Design Capacity FM FM Pumping FM FM Firm Pumps Velocity Velocity TDH Pumping Scenario Status Status hate Installed 4„ „6 (gpm) 4" 6" (ft) Capacity ft/s ft/s in i21.5 Op ° Ckv" 121.5 3A& NA 46 121.5 rpm 2@ 2 121.5 Closed Open 206 NA 2.34 15 206 m 2@ 3 121.5 Open Open 223 1.46* 1.88* 9 223 m 3 OW _ 4 121.5 3.46 35 305 few 121'S 'Open 17 8/m L:JJ 34fl8 Z6 .i,JJ' 6 2 @m375 Closed Open 498 NA 5.65 98 498 7 2 @m375 Open. Open 586 3.83 4.94 79 586 gP 8 3 @' 375 Closed Open 305/4.-a NA 6.93 140 610 --- + 3 ci? 3;5 9 Open ()pen 382/ea 5.01 6.45 121 764 m *Does not provide 2 ft/sec flushing velocity. Utilization of this operating scenario is not recommended. RBOZ-07004-05_Eng-Rprt 5 (03/22/10)CN/tsc C Table 3 estimates the number of dwelling units that could be serviced by the particular pumping unit and force main combinations presented in Table 2. Table 3 assumes a general dwelling unit population of 2.11 persons, a per capita wastewater flow of 89 gpm, and uses Equation 1.0 to determine the peak hourly to average day wastewater flow ratio. Table 3—Dwelling Unit Threshold per Lift Station Configuration Scenario Farm Pumping Capacity Approximate Approx. No. of Dwelling m Population Units Served 1 121,5 49 - 234 2 206 868 411 3 223 945 448 4 305 I 1,327 629 5 355 --- l.5G5 -- '42 6 498 2,276 1,079 7 586 2,725 1,291 8 610 2,853 1,352 9 764 3,668 1,738 (NOTE: In order to better estimate design flows for future phases of development, it will be extremely important to monitor the wastewater flows from the Phase I so that actual flowrate data is used as the basis of design. Some modification to the design flow at full build-out will likely be seen based on the flows actually occurring in the existing developed phases). 4.3 Wet Well The wet well is sized to allow the installation of a tri-plex pump configuration as shown in the project drawings. The configuration of the lift station discharge piping has also been configured with an external connection point for the discharge piping of a portable pumping unit that may be installed by the City of Bozeman during emergency conditions. The wet well is sized to allow the pumping units to remain submerged below the "pump off' level; to provide for the working pump on and off volume; to allow for an equalizing storage volume; and to allow for an emergency volume between the top of the equalizing volume and invert of the influent pipe. Given the anticipated high ground water conditions, special consideration must also be given to buoyancy forces and mitigation measures to offset these forces, as discussed in Section 4.3.3 below. 4.3.1 Equalizing Storage As was mentioned in Section 2 above, a 121.5 gpm pumping rate limitation will be in place through the first phase of development at Norton Ranch. 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I ix LIFT STATION FORCE-MAIN — , —47BIT n 47 w • Ir DURSTON ROADlu,4, J-- EXIST NORTON t-NN LIFT STATION FORCE MAIN W Por 'tr L j, 4786AT 7 T 1.,;id 0 2000 4 & T,- + IN FEET LIE Engineers 2880 Technology BNd.W. DRAWN BY: JB8 PROJECT NO ----JJMORRISON """y"' BozemwMT59718 CHKD.BY: jRN BOZEMAN NORTON EAST RANCH 5149,003 so-ti.te MONTANA pf-- Phom:(406)M7-0721 APPR.BY: jRN MAIERLE,INC. Fw:(4W)922-6702 FIGURE NUMBER A.Enw1cy--O--d C—,-.j DATE: 0412014 CONNECTION TO CITY OF BOZEMAN SEWER LINE 1N.15149\OD4\ACAD1ExhlbltsXCOSGraAtyMains.dwg Plotted tyy jodle bIn9w on Apr/21f2014 V-2 Appendix E Excerpts from Facility Plan 1 1 1 r -.. 1 � 1 1 4 r 1 i 1 1 � 1 A 1 1 1 1 1 1 r r 1 1 r ' 1 e t 1 C-i 00 00 r two1 I Sl 1 � ' •M r r r 1 r r ' r 1 1 r r 1 1 1 1 r r r 1 1 ' 1 1 � - 1 r ' r f � r 1 - r 1 ' 1 1 r 1 EID 1 � 1 r r r r � r r r Project BD Ederesfon Prc is E1 Arnica E2 Augusta Drive E3 Baxter Meadows Connector E4 Bridger Canyon E5 Not Used E6 Cattail Overflow E7 College Extension E8 Cottonwood E9 E.Frontage Road E10 Ferguson El Flanders Mill-Hidden Valley E12 Fort Ellis E13 Fowler Extension E14 Gardner Park-Abigail Ranch E15 Garfield Extensions eE16 Gooch Hill-Flanders Mill Connector E17 Haggerty Extension E18 Lincoln-Garfield Extension E19 Lincoln-MSU South E20 Lower Gooch Hill E21 Mcllhattan North/Springhill E22 Mcllhattan South E23 Mount Ellis E24 Painted Hills E25 Rouse Extension E26 S.19th Avenue E27 S.3rd Avenue f E28 Sourdough Creek ! I E29 Sourdough Creek-Hitching Post E30 Story Mill E31 Stucky-Patterson E32 Stucky Extension C94 Tov�hcchnnln n 1 ' DO THE CITY OF BOZEMAN �.� 20 E. OLIVE a P.O. BOX 1230 BOZEMAN, MONTANA 5977 1-1 230 ENGINEERING DEPARTMENT ' T!N CO 0 PHONE: (406) 582-2280 a FAX: (406) 582-2263 April 15, 2014 ' James R. Nickelson, P.E. Morrison Maierle, Inc. P.O. Box 1113 ' Bozeman, MT 59771 RE: Norton East Ranch Outfall Sewer ' Dear Mr. Nick elson: The City of Bozeman is currently reviewing the sewer extension plans and specifications for the above referenced project. Adequate capacity exists in the City's sewer collection system to provide service for the property served by this extension. In accordance with our policy, City of Bozeman final approval will not be given until the project plans have successfully completed the City's review process and written approval for the project is ' received from the Montana Department of Environmental Quality. pp Please contact me if you have any questions. ' Sincerely, Robert J. Murray Jr., P.E. ' Project Engineer ' cc: John Alston, Acting Water/Sewer Superintendent Dept. of Environmental Quality ERF Project File ' HOME OF MONTANA STATE UNIVERSITY GATEWAY TO YELLOWSTONE PARK