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Home My WebLink AboutCOW 2012-11-13 Item 5D - Contract Supplement #3 - Water and Sewer Comprehensive Plans with Carollo Engineers for $16,250COUNCIL AGENDA SYNOPSIS Initial Meetin Date Prepared by Ma r'r rev' w Co nJI review 11/13/12 BG Resolution Mtg Date Ordinance Mtg Date 11/19/12 B ❑Other Mtg Date SPONSOR Council Mayor HR DCD Finance Fire IT P&R Police PW SPONSOR'S Carollo Engineers were hired as the consultant for the Water and Sewer Comprehensive SUMMARY Plans in 2010. Due to additional requirements on the Water Comprehensive Plan, Supplement No. 3 with Carollo is required to add to the scope of work. Additional water funds will come from the Interurban Water Reuse and Andover Park E Water Line. Council is being asked to approve Supplement No. 3 with Carollo Engineers in the amount of $16,250.00. REVIEWED BY COW Mtg. CA &P Cmte F &S Cmte Transportation Cmte Utilities Cmte Arts Comm. Parks Comm. Planning Comm. DATE: 10/23/12 COMMITTEE CHAIR: DENNIS ROBERTSON RECOMMENDATIONS: SPONSOR /ADMIN. Public Works Department COMMITTEE Majority Approval; Forward to Committee of the Whole COST IMPACT FUND SOURCE EXPENDITURE REQUIRED AMOUNT BUDGETED APPROPRIATION REQUIRED $16,250.00 $344,000.00 $0.00 Fund Source: 401 WATER FUND Comments: MTG. DATE RECORD OF COUNCIL ACTION 11/13/12 ITEM INFORMATION ITEMNO. 5.D. 105 STAFF SPONSOR: BOB GIBERSON ORIGINAL AGENDA DATE: 11/13/12 AGENDA ITEM TITLE Water and Sewer Comprehensive Plans Consultant Supplemental Agreement No. 3 with Carollo Engineers CATEGORY Discussion Mtg Date 11/13/12 Motion Mt g Date 11/19/12 Resolution Mtg Date Ordinance Mtg Date Bid Award Mtg Date Public Hearing Mtg Date ❑Other Mtg Date SPONSOR Council Mayor HR DCD Finance Fire IT P&R Police PW SPONSOR'S Carollo Engineers were hired as the consultant for the Water and Sewer Comprehensive SUMMARY Plans in 2010. Due to additional requirements on the Water Comprehensive Plan, Supplement No. 3 with Carollo is required to add to the scope of work. Additional water funds will come from the Interurban Water Reuse and Andover Park E Water Line. Council is being asked to approve Supplement No. 3 with Carollo Engineers in the amount of $16,250.00. REVIEWED BY COW Mtg. CA &P Cmte F &S Cmte Transportation Cmte Utilities Cmte Arts Comm. Parks Comm. Planning Comm. DATE: 10/23/12 COMMITTEE CHAIR: DENNIS ROBERTSON RECOMMENDATIONS: SPONSOR /ADMIN. Public Works Department COMMITTEE Majority Approval; Forward to Committee of the Whole COST IMPACT FUND SOURCE EXPENDITURE REQUIRED AMOUNT BUDGETED APPROPRIATION REQUIRED $16,250.00 $344,000.00 $0.00 Fund Source: 401 WATER FUND Comments: MTG. DATE RECORD OF COUNCIL ACTION 11/13/12 11/19/12 MTG. DATE ATTACHMENTS 11/13/12 Informational Memorandum dated 10/19/12 Supplement No. 3 to Contract No. 10 -055 Minutes from the Utilities Committee meeting of 10/23/12 11/19/12 105 1. City of Tukwila Jim Haggerton, Mayor INFORMATIONAL MEMORANDUM TO: Mayor Haggerton Utilities Committee Q� FROM: Bob Giberson Public Works Directorl BY: Mike Cusick, PE, Senior Engineer DATE: October 19, 2012 SUBJECT: Water and Sewer Comprehensive Plans Project No. 91040101, Contract No. 10 -055 Supplemental Agreement No. 3 ISSUE Approve Supplemental Agreement No. 3 with Carollo Engineers to revise the Comprehensive Water Plan. BACKGROUND In 2010 the City contracted with Carollo Engineers to update the Water Comprehensive Plan. DISCUSSION For the 2005 Comprehensive Water Plan, the Washington State Department of Health (DOH) required no additional storage of water in lieu of the existing 2 million gallon reservoir and multiple taps off Seattle pipelines. In 2009, DOH guidelines were revised to require standby storage of water at 200 gallons per equivalent residential unit (ERU). With the 2009 DOH storage guidelines, the existing Tukwila 2 million gallon reservoir is now undersized for the current population of the city. With the projected 2030 population growth model provided by the Tukwila Department of Community Development (DCD), the condition worsens. Initially, Carollo Engineers used the 2010 -2030 population data study from Puget Sound Regional Council (PSRC), as provided by DCD, to determine the required reservoir size to meet the revised requirements from DOH. Using the PSRC 2030 population model, the City of Tukwila would be required to construct a new reservoir to bring the City's total water storage to 7.1 million gallons with a design and construction cost for the proposed reservoir at over $5.5 million dollars. This cost estimate does not include the cost of land acquisition for the reservoir and a necessary pump station. The total cost of the project could be over $10 million dollars for the reservoir, pump station, and land. With the high cost of the required water reservoir and other water CIP improvements, Public Works questioned DCD on the projected 2030 population growth model for the City. It was agreed that the 2030 PSRC model used for population forecasting overstates projected growth within the City. For the Comprehensive Water Plan, DCD agreed to cut the projected growth in half by changing the time period from 2010 -2030 to 2010 -2040. With a reduced population growth, the total reservoir requirement of 7.1 million gallons can be reduced to 4 to 5 million gallons of total storage. The reduction in reservoir size results in savings to the City of several million dollars in costs to the Water Fund. Carollo Engineers additional work will modify the Water Comprehensive Plan. The supplement will focus on updating the revised growth projections with the new 2012 data 107 Info Memo Page 2 Carollo Engineers Supplement No. 3 developed by DCD. The reduced growth projections will be used to calculate new average and maximum day water demand for future planning scenarios. The new demand will be updated in the supply analysis, hydraulic modeling analysis, and storage analysis. The system will be evaluated to determine the deficiencies and proposed improvements needed with the new demand in each service area. It is anticipated that this will also modify the proposed improvements in the CIP and this new data will modify most sections of the Water Comp Plan. FINANCIAL IMPACT Supplemental Agreement No. 3 will increase the consultant's scope of work for Task 300 Planning Considerations for $16,250.00. Funding for the additional work will come from the Interurban Water Reuse Project, page 86 of the 2012 CIP at $25,000.00 and Andover Park West Water Line Project for $16,000.00, which will now be constructed in 2013. EXPENDITURES Funding Budget Original contract $291,000.00 Water Comp Plan $160,000.00 Supplement No. 1 12,662.00 Sewer Comp Plan 143,000.00 Supplement No. 2 21,721.50 Interurban Water Reuse 25,000.00 Supplement No. 3 16.250.00 APE Water Line 16.000.00 Total $341,633.50 $344,000.00 RECOMMENDATION Approve Supplemental Agreement No. 3 to Contract No. 10 -055 with Carollo Engineers for $16,250.00 to update population growth projects for the Comprehensive Water Plan and consider this item at the November 13, 2012 Committee of the Whole and subsequent November 19, 2012 Regular Meeting. Attachment: Supplemental Agreement No. 3 108 W: \PW Eng \PROJECTS\A- WT Projects \Water Comprehensive Plan -Water (91040101) \Info Memo Carrollo Sup #3 10- 16- 12.docx SUPPLEMENTAL AGREEMENT NUMBER 3 to CONSULTANT AGREEMENT NUMBER 10 -055 C G� THIS SUPPLEMENTAL AGREEMENT is entered into between the City of Tukwila, Washington, herein -after referred to as "the City," and Carollo Engineers hereinafter referred to as "the Consultant in consideration of the mutual benefits, terms, and conditions hereinafter specified. The City desires to supplement the agreement entered into with the Consultant and executed on, May 19, 2010, and identified as Agreement No. 10 -055. All provisions in the basic agreement remain in effect except as expressly modified by this supplement. The changes to the agreement are described as follows: 1. Scope of Services, for Supplemental Agreement #3 to the Comprehensive Sewer and Water Plans (Plans) for the City of Tukwila. The purpose of this supplement is to add: The following work effort is a modification to the Comprehensive Plan (Plan) for the City of Tukwila. The update will be focused on updating the revised growth projections with the new 2012 data developed by the Planning Department. The growth projections will be used to calculate new average and maximum day water demand for the future planning scenarios. The new demand will be updated in the supply analysis, hydraulic modeling analysis and the storage analysis. The system will be evaluated to determine the deficiencies and proposed improvements needed with the new demand in each service area. It is anticipated that this will also modify the proposed improvements in the CIP. This new data will modify most sections of the Plan. 2. Deliverables, Carollo will prepare a revised Executive Summary and Chapters 2, 3, 5, 6, 7 that summarizes the new future demand, analysis and recommended improvements. 3. Time for Performance, is amended to change the number of calendar days for completion of the work to read an additional 90 days for a total of 1,070 days. 4. Payment, shall be amended as follows: Payment for the work provided by the Consultant as part of this supplement shall be made for an additional $16,250.00. The total amount for the Consultant for this contact shall not exceed $341,633.50 without express written modification of the Agreement signed by the City. DATED this CITY OF TUKWILA day of 1 2012. Jim Haggerton, Mayor CONSULT�ANT Lara Kammereck, Associate Vice President 5, CIA2 /c�,U� L S pw: \Carollo\Documents\ Client \WA \Tukwila \8472A00\Project Management \Contracts \Carollo Supplemental Agrmnt 3.docx 109 Utilities Committee Minutes October 23, 2012 Page 2 C. Supplemental Agreement No. 3: Water Comprehensiv Plan Staff is seeking Council approval for Supplemental Agreement No. 3 with Carollo Engineers for the updating of revised growth projections from 2012 data for the Water Comprehensive Plan in the amount of $16,250. The updated projections will be utilized to calculate future water demand and planning scenarios. UNANIMOUS APPROVAL. FORWARD TO NOVEMBER 13 COW FOR DISUCSSION. D. Surface Water Comprehensive Plan Due to time constraints, continued discussion and review of the Surface Water Comprehensive Plan will be delayed to a future Utilities Committee meeting. RESCHEDULE FOR FUTURE COMMITTEE MEETING. III. MISCELLANEOUS Meeting adjourned at 6:25 p.m. Next meeting: Next meeting: Wednesday, November 14, 2012 5:00 p.m. Conf. Room No. 1. *11'ecbnesday clue to holiday. OK I Committee Chair Approval Minutes by KOM. Reviewed by GL. G