===== PDF PAGE 17 ===== [Extraction: embedded PDF text] CITY OF WEST CHICAGO INFRASTRUCTURE COMMITTEE AGENDA ITEM SUMMARY ITEM TITLE: Resolution No. 19-R-0050 - Contract Award - Clark Dietz, AGENDA ITEM NUMBER: lf ,J?~ Inc. For Professional Engineering Services Associated with the Wastewater Treatment Plant Digester #1 Improvement FILE NUMBER: ------ Project COMMITTEE AGENDA DATE: October 3, 2019 COUNCIL AGENDA DATE: October 21, 2019 STAFF REVIEW: Robert E. Flatter, P.E., Director of Public Works APPROVED BY CITY ADMINISTRATOR: Michael L. Guttman SIGNATURE _________ _ ITEM SUMMARY: Under permit from the EPA, the West Chicago/Winfield Regional Wastewater Treatment Plant (WWTP) has three digesters to manage incoming flows and solid loadings at the WWTP. The first two anaerobic digesters (i.e., #1 and #2) are considered the primary digesters and are used to heat and mix the waste solid (sludge) during the digestion process before it is dewatered, using belt filter presses, and taken to a landfill. Digester #3 is not heated or mixed and is used as a secondary digester and storage. In 2006 the secondary digester tank (i.e., Digester #3) was cleaned and repaired. During the period of 2010 thru 2013, the interior of Digester #2 was cleaned and repairs were made to the internal digestion system equipment and components, including all gas safety equipment. Once repairs were completed with Digester #2, it was determined in the best interest of plant operations to clean and transfer sludge from Digester #1 into Digester #2; rather than generate new sludge for Digester #2 and pay to haul away the sludge from Digester #1. Once Digester #1 was cleaned, the City hired Clark Dietz, Inc. (COi) to inspect Digester #1 's internal digestion system equipment and components. Significant repairs were identified by COi, who was then hired to perform Phase II engineering design services for the needed repairs. However, for budgetary reasons, repairs were not initiated and Digester #3 has sat unused since 2013. Digester #3's internal digestion system equipment and components are approximately thirty-three (33) years old and have out performed their useful life (i.e., typically 15-20 years). Being very familiar with the City's Wastewater Treatment Plant and its digestion treatment process, and having previously provided design services and construction oversight services for the WWTP Digesters, and having already substantially completed design services for Digester #1, City staff approached CDI and requested a cost proposal to finalize Phase II en9ineering design services, provide bid assistance, and perform Phase Ill engineering construction oversight services associated with repairs to Digester #1. COi's proposal is for a not to exceed amount of $80,700.00. If approved, COi will finalize design services and provide bid assistance during 2019 for an amount not to exceed $21,660.00. Construction is not anticipated to start until FY 2020, where COi will provide construction oversight services for an amount not to exceed $59,040.00. Adequate funds are currently budgeted/proposed in the West Chicago/Winfield Wastewater Authority Budget to cover said expenses. Staff recommends that City Council award a professional services contract to Clark Dietz, Inc., for Professional EnQineerinQ Services associated with the Digester #1 Improvement Project, for an amount ===== PDF PAGE 18 ===== [Extraction: embedded PDF text] CITY OF WEST CHICAGO not to exceed $80,700.00. ACTIONS PROPOSED: Approve Resolution No. 19-R-0050 authorizing the Mayor to execute a contract with Clark Dietz, Inc., for an amount not to exceed $80,700.00, for professional engineering services associated with the Wastewater Treatment Plant Digester #1 Improvement Project. COMMITTEE RECOMMENDATION: ===== PDF PAGE 19 ===== [Extraction: embedded PDF text] RESOLUTION t'JO· 19-R-0050 A RESOLUTION AUTHORIZING THE MAYOR TO EXECUTE A CONTRACT AGREEMENT WITH CLARK DIETZ, INC. FOR PROFESSIONAL ENGINEERING SERVICES RELATED TO THE DIGESTER #1 IMPROVEMENT PROJECT BE IT RESOLVED by the City Council of the City of West Chicago, in regular session assembled, that the Mayor is hereby authorized to execute a Contract Agreement for Professional Engineering Services related to the Digester # 1 Improvement Project at the West Chicago/Winfield Regional Wastewater Treatment Plant, between the City of West Chicago and Clark Dietz, Inc., for an amount not to exceed $80,700.00, in substantially the form attached hereto and incorporated herein as Exhibit "A". ADOPTED this 2pt day of October, 2019 AYES: NAYES: ABSTAIN: ABSENT: Mayor ATTEST: City Clerk ===== PDF PAGE 20 ===== [Extraction: embedded PDF text] Clari< Uietz Engineering Quality of Life'· < .._ ....___________ __ February 27, 2019 Mr. Robert Flatter Public Works Director City of West Chicago 4 75 Main Street West Chicago, IL 60185 Re: Proposal Request Response Digester No. 1 Construction Phase Services Dear Mr. Flatter: On behalf of Clark Dietz, I want to thank you for the opportunity to provide you with a proposal to provide construction phase services for the Digester No. 1 Improvements that were designed in 2013. We have reviewed the 2013 documents and discussed the project briefly with your WWTP operator and have prepared the following scope based on our understanding of the project. This letter proposal summarizes our understanding, project approach and scope, our team, and our proposed schedule. The breakdown of our fee estimate by task and personnel is attached. Based on our previous work with you, we are not providing a "full" proposal including our qualifications. If, however, you would like references or additional information please let me know and I will forward those to you. Project Understanding The City of West Chicago and the Village of Winfield jointly own the wastewater treatment plant (WWTP), which discharges to the West Branch of the DuPage River under NPDES Permit No. IL0023469. Wastewater is treated through a series of unit processes, including screening, grit removal, clarification, aeration, filtration, and disinfection, to reduce the concentrations of biochemical oxygen demand (BOD), solids (TSS), ammonia, and microorganisms. St uPr~rc. The primary clarifiers remove 30% to 50% of the solids from the influent wastewater. Secondary biological treatment creates microorganism that treat the wastewater. Excessive microorganisms are removed from the secondary treatment system as waste activated sludge (WAS). Raw sludge removed in primary clarification is sent directly to the primary anaerobic digesters. WAS is thickened prior to discharge into the primary anaerobic digesters. The anaerobic digestion system reduces the volume of solids and reduces solids pathogen concentration. Digested sludge is then dewatered and disposed of in a landfill. D1c;,;s-;u1s. The WWTP has three (3) anaerobic digesters. The WWTP utilizes a two-stage high rate digestion process. The first two anaerobic digesters (No. 1 and No. 2) are the primary digesters and are heated and mixed; Digester No. 3 is not heated or mixed and is used as a secondary digester and for storage. Each of the three digesters is a covered circular tank with a cone slope bottom. 1815 S. Meyets Road. Suite 470 / Oal1brooh Ter1ace. IL 60181 / 630.413.4130 / clarkdietz.com ===== PDF PAGE 21 ===== [Extraction: embedded PDF text] Mr. Robert Flatter February 27, 2019 Page2 Previously both the primary digesters employed three confined draft tube gas lifters (mixing guns). In 2012, the City replaced the inoperable mixing system in Digester No. 2 with a new mechanical nozzle type of system. In 2013, Clark Dietz designed similar replacement systems for Digester No.1 with new mechanical nozzle mixing systems, new heat exchanger, and new gas safety equipment. 01G:-:s rui No. J Srflrns. For budgetary reasons, the Digester No. 1 improvement project was neither bid nor constructed in 2013. As a change order to the Digester No. 2 rehabilitation project, Digester No. 1 was cleaned in April 2013. It was then filled with water to avoid excessive stress on the lid. No modifications have been made to Digester No. 1 since April 2013. c{ 1rmrnr Wornc The City is now ready to construct the improvements to Digester No. 1 and place it back into service. Also, they would like to have Digester No. 3 cleaned as part of the Work. Engineering services to accomplish this work will involve resubmitting the construction permit, minimal updating of the design plans and specifications, bidding services, and construction services as described in detail below. t-:·d r~np, rEo cow;rnucr10N CosT. The low bid in 2012 for the Digester No. 2 Work, which included cleaning of Digester No. 1, was for $781,000. Disposal of the materials cleaned out of Digester No. 1 was a unit price item. The actual volume of clean materials was greater than the assumed amount, therefore there was a $34,339.21 change order, which brought the total contract price to $815,339.21. We have estimated cost of the proposed Digester No. 1 construction work using the 2012 total contract price and annual construction inflation using the Turner Construction Cost Inflation Index for 2013 through 2018 (and estimated for 2019). Based on this, the estimated bid price for the Digester No. 1 Work is $1,072,000. Project Approach Clark Dietz's approach to preforming the final Engineering Design will be to utilize the existing design documents prepared in 2013 as much as possible to minimize the amount of engineering required. Design Engineering work will include checking and updating the specified equipment, updating references to the WWTP SCADA integrator, preparing an IEPA construction permit application, and utilizing the latest version of the City's contract document language. For Bidding and Construction, we will follow the plan that we have utilized for the last several construction projects we have worked with the City on: attending regular meetings, handling correspondence with the Contractor, coordinating issues between the City/operator and the Contractor, and reviewing submittals, RFls, and Pay Application. The following is a detailed breakout of the scope. Project Administration i