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Home My WebLink About23 - Professional Services Agreements - Advanced Engineering and Environmental Services, LLC - Wastewater Collection System Model DocuSign Envelope ID:042B36C6-B97E-46E6-B301-BCF9C8219484 Amendment No. 3 to Professional Services Agreement for: Wastewater Collection System Model Update—Phase 2 THIS AGREEMENT is made as of this 18th day of April 2023 between THE CITY OF BOZEMAN, a Municipal Corporation, Bozeman, Montana, herein referred to as CITY and Advanced Engineering and Environmental Services, LLC an Engineering Consulting Firm of Bozeman, Montana, herein referred to as Consultant. WHEREAS,the parties have entered into a Professional Services Agreement dated February 24, 2020, herein referred to as Original Agreement for professional engineering services; and WHEREAS,the parties desire to further amend the provisions of this Agreement. NOW,THEREFORE,IN CONSIDERATION OF THE MUTUAL COVENANTS CONTAINED HEREIN,the parties agree as follows: Amend Section 1. Purpose: of the Original Agreement to add a new paragraph to read: City and Consultant agree to incorporate and Consultant agrees to perform additional Scope of Services attached hereto as "Attachment A—Wastewater Collection System Model Update—Phase 2—Amendment 3". Amend Section 4. Payment for Scone of Services: of the Original Agreement to add a new paragraph to read: City agrees to pay Consultant for the completion of the additional Scope of Services attached hereto as "Attachment A — Wastewater Collection System Model Update — Phase 2 — Amendment 3" and totals $15,580.00. The Consultant's billing rates in $190/hr for its employees are included with this Attachment A. Except as specifically amended herein, the Original Agreement shall remain in full force and effect and the Parties shall be bound by all terms and conditions therein. IN WITNESS WHEREOF, the parties hereto do make and execute this Agreement on the day and year first above written. CITY OF BOZEMAN Docuft� ned by: Jeff @a DQA@8A824A6... City Manager DocuSigned by: ATTEST: sus DocuSigned by: T�, fir✓ Mi tfa5095AB475... City Clerk Page 1 of 2 DocuSign Envelope ID:042B36C6-B97E-46E6-B301-BCF9C8219484 APPROVED AS TO FORM DocuSigned by: G A44B... City Attorney CONSULTANT gned by: DocuSi By: m 2004DME4FD84F4... Its: Operations Manager ATTEST: By: Page 2 of 2 DocuSign Envelope ID:042B36C6-B97E-46E6-B301-BCF9C8219484 ATTACHMENT A—Wastewater Collection System Phase 2—Facility Plan SCOPE OF SERVICES—Amendment No. 3 Proposed Tasks: Modeling Condition 1:Canyon Gate Downstream Modeling Tasks: Modeling tasks under Condition 1 will assess the collection system with the Development connecting to the 10-inch gravity sewer on Story Mill Rd and downstream sewers to the North Frontage Road interceptor.These modeling tasks are intended to satisfy the third party analysis as referenced in the Recommended Condition of Approval to Application#22264, Paragraph 1 as outlined in the memorandum Canyon Gates Subdivision Preliminary Plat Application No. 22264—Recommended Conditions of Final Plat Approval dated February 1, 2023, authored by Lance Lehigh, Interim City Engineer. Task 1.00:Review Documentation • AE2S will review the development engineer's sewer report to ascertain planning numbers for sizing sewer infrastructure. • Estimated time: 2 hours total. Task 2.00:Review Basin Boundaries • AE2S will review the existing basin boundaries and provide updates to the City boundary files. • Estimated time: 2 hours total. Task 3.00:Model Analysis& Design Review • AE2S will run the hydraulic model with the proposed development added. o Scenario 1:AE2S will assess the existing system with the Development connecting to the 10-inch on Story Mill Rd and downstream sewers to the North Frontage Road interceptor. o Scenario 2:AE2S will assess the Development under ultimate buildout conditions. • The following parameters established in the Draft WWFPU will be used: o Domestic flow on a per-capita basis with diurnal peaking. o Base ground water inflow for Dry Weather and Wet Weather. o Design storm for assessing peak flow during wet weather. • The Design Average flow from Dry Weather and Peak flows from wet weather scenarios will be analyzed and presented. Model results will be compared to sewer capacity which is defined as the 75-percent depth to diameter ratio (0.75 d/D). If capacity is exceeded, sewer up-sizing will be determined for system buildout. • Estimated time: 8 hours total. Task 4.00: Canyon Gate Downstream Analysis Documentation • AE2S will write and deliver a technical memorandum (delivered as a pdf document). • Documentation will include: o Summarizing Development and model input parameters. o Summarize improvements required for each scenario. o Consideration for flow monitoring location during we weather periods. o Approximate available capacity in sewers analyzed for development tracking. o Estimated time: 22 hours total. Task 5.00:Facility Plan Updates 0 AE2S will update the facility plan model with the Canyon Gate sewer analysis. DocuSign Envelope ID:042B36C6-B97E-46E6-B301-BCF9C8219484 • AE2S will update the facility plan documentation. • Estimated time: 12 hours total. Task 6.00:Meetings. • Four meetings are anticipated: kickoff discussions (completed), initial findings discussion, and documentation review meeting. • Estimated time: 4 hours total. Modeling Condition 2 Canyon Gate Upstream Diversion Modeling Tasks: (To be completed only if the developer proceeds with proposal to divert upstream sewage.) Modeling tasks under Condition 2 will assess the existing system with the Development connecting to the 10-inch on Story Mill Rd with upstream diversion of flow. Sewered areas south of Bridger Canyon Dr will be diverted west to Rouse Ave as proposed by the Canyon Gate development design report.These modeling tasks are intended to satisfy the third party analysis as referenced in the Recommended Condition of Approval to Application#22264, Paragraph 3 as noted in the memorandum Canyon Gates Subdivision Preliminary Plat Application No. 22264—Recommended Conditions of Final Plat Approval dated February 1, 2023, authored by Lance Lehigh, Interim City Engineer. Task 7.00:Model Analysis& Design Review • AE2S will run the hydraulic model with the proposed development added. o Scenario 3:AE2S will assess the existing system with the Development connecting to the 10-inch on Story Mill Rd with upstream diversion of flow. Sewered areas south of Bridger Canyon Dr will be diverted west to Rouse Ave as proposed by the Canyon Gate development design report. o Scenario 4:AE2S will assess the Development under ultimate buildout conditions. • The following parameters established in the Draft WWFPU will be used: o Domestic flow on a per-capita basis with diurnal peaking. o Base ground water inflow for Dry Weather and Wet Weather. o Design storm for assessing peak flow during wet weather. • The Design Average flow from Dry Weather and Peak flows from wet weather scenarios will be analyzed and presented. Model results will be compared to sewer capacity which is defined as the 75-percent depth to diameter ratio (0.75 d/D). If capacity is exceeded, sewer up-sizing will be determined for system buildout. • Estimated time: 8 hours total. Task 8.00: Canyon Gate Upstream Diversion Analysis Documentation • AE2S will write and deliver a technical memorandum (delivered as a pdf document). • Documentation will include: o Summarizing Development and model input parameters. o Summarize improvements required for each scenario. o Consideration of flow direction for the Big Gulch drainage basin and the East Gallatin drainage basin (southeast of Bridger Dr). o Consideration for flow monitoring location during we weather periods. o Approximate available capacity in sewers analyzed for development tracking. o Estimated time: 10 hours total. Task 9.00:Facility Plan Updates • AE2S will update the facility plan model with the Canyon Gate sewer analysis. • AE2S will update the facility plan documentation. • Estimated time: 12 hours total. DocuSign Envelope ID:042B36C6-B97E-46E6-B301-BCF9C8219484 Task 10.00:Meetings. • Four meetings are anticipated: kickoff discussions (completed), initial findings discussion, and documentation review meeting. • Estimated time: 2 hours total. Proposed Fee• The total fee for this study is not to exceed $15,580. (Based on 82 hours at Donovan's rate of$190 per hour at Engineer III.) • Modeling Condition 1: Downstream Modeling Total Fee: $9,500 (50 hours). • Modeling Condition 2: Upstream Diversion Modeling Total Fee:: $6,080 (32 hours). Proposed Schedule: • Modeling Condition 1: Downstream Modeling Schedule: o Draft Memorandum: 30 calendar days after authorization. o Final Memorandum: returned to City within one week(after City review and comment period). • Modeling Condition 2: Upstream Diversion Modeling Schedule: o Draft Memorandum: 60 calendar days after authorization. o Final Memorandum: returned to City within one week(after City review and comment period).