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HomeMy WebLinkAboutTerracon - Po.Serv.Agmt2 HAWTHORNE AVE PUMPING - 5.2.2022April 15, 2022 City of Waterloo 715 Mulberry Street Waterloo, Iowa 50703 Phone: (319) 291-4312 Email: Wayne.Castle@Waterloo-IA.org Attention: Mr. Wayne Castle, PLS, PE Re: lrerracon Supplemental Proposal for Preliminary Engineering for Replacement of the North Well Hawthorne Avenue Pumping Station Waterloo, Iowa Terracon Proposal No. P13217071B Dear Mr. Castle: Terracon Consultants, Inc. (Terracon) appreciates the opportunity to submit this proposal for preliminary engineering services for the replacement of the north flood control relief well located at the Hawthorne Avenue Pumping Station in Waterloo, Iowa (hereinafter, the site). Terracon's general scope of services, budget, schedule, health and safety plan, and general comments are provided in the following sections A PROJECT INFORMATION Terracon completed a Relief Well Assessment Report (Terracon Project 13217071, dated November 12, 2021) for the North and South wells at the site. A Report Addendum for the North Relief Well dated February 16, 2022 was also completed. The City of Waterloo submitted these reports to the United States Army Corp of Engineers (USACE) for their review. On March 16, the USACE recommended that the north relief well be replaced in -kind due to expected unsatisfactory performance as indicated by a well efficiency of 60% and significant sanding of the well. B SCOPE OF SERVICES Terracon has a 100% commitment to the safety of all its employees. As such, and in accordance with our Incident and Injury Free® safety culture, Terracon will develop a safety plan for use by our personnel during field services. Prior to commencement of on -site activities, Terracon will hold a meeting to review health and safety needs for this specific project. Our proposed Scope of Services includes field exploration, laboratory testing, and engineering/project delivery. These services are described in the following sections. Terracon Consultants, Inc. 3105 Capital Way Suite 5 Cedar Falls, Iowa 50613 P [319] 277-4016 F [319] 277-4320 terracon.com Environmental • Facilities • Geotechnical • Materials Preliminary Engineering for Replacement of the North Well Hawthorne Avenue Pumping Station Waterloo, Iowa April 15, 2022 Terracon Proposal No. P13217071B Drilling Program Plan (DPP) lrerracon Prior to performing field services, Terracon will prepare and submit a DPP to the City of Waterloo and USACE for review and approval to perform the work. The DPP will include and/or address the following: • Project objective and justification • Terracon key project team members • Existing information review • Terracon Project No. 13217071, reports dated November 12, 2021 and February 15, 2022. B5WLOOEV-Plan_Set AS-BLT-1983-11-29-WLOO_STAGE_IIID provide by USACE References to applicable field exploration ASTM and USACE Engineer Regulations (ER110-1-1807) Drilling scope and methodology Risk evaluation for soil borings at the toe of the existing levees. Field Services Boring Layout and Elevations: The location of the proposed location of the replacement well will be within 10 feet north of the existing north relief well. Terracon will stake the location in the field. Latitudes and longitudes will be obtained by superimposing the site plan onto Google Earth photography. We will used handheld GPS equipment to locate the boring in the field. Our GPS equipment has a horizontal accuracy of about 20 feet or better. Relative surface elevation at the boring location will be determined by using differential leveling techniques and will be reported to the nearest'/2-foot. The location and elevation of the boring should be considered accurate only to the degree implied by these methods. If more accurate boring location and elevation are desired, we suggest a land surveying firm stake the boring location and provide surface elevations at the boring location to us. Subsurface Exploration: Terracon's field services include performing the following subsurface exploration program. Number of Borings Planned Boring Depth (feet) Planned Location 1 1. Below the existing ground surface 2. Or practical auger refusal. 80 North Replacement Well Subsurface Exploration Procedures: We will advance the boring with a rotary drill rig using continuous flight augers. Continuous sampling will be performed using a split -barrel sampler Responsive • Resourceful • Reliable 2 Preliminary Engineering for Replacement of the North Well Hawthorne Avenue Pumping Station Waterloo, Iowa April 15, 2022 Terracon Proposal No. P13217071B lrerracon throughout the depth of the boring. Upon encountering bedrock or practical auger/bit refusal in the boring, the boring will be terminated. We observe and record groundwater levels during and after drilling and sampling. In some instances, groundwater observations may not be representative because drilling fluids or water are used. Terracon's exploration team will prepare a field boring log as part of standard drilling operations. The field log will include sampling interval depths, penetration resistances, and other relevant drilling and sampling information. Our field log will also include visual descriptions of materials encountered during drilling and the drill crew's interpretation of subsurface conditions between samples. The samples will be containerized and transported to our laboratory for further testing and classification. Our engineering staff and the drill crew will communicate during the exploration. If the subsurface conditions encountered appear to be unfavorable or marginal, we will modify our subsurface exploration while we are on site. If additional fees apply, we will contact the client for authorization, prior to performing any additional services. Disposal of Excess Drilling Fluids and Cuttings: Terracon plans to backfill the borehole with bentonite grout. Terracon's exploration team will make an effort to minimize the amount of drilling fluids and auger cuttings remaining upon backfilling of the borehole. In the event that excess auger cuttings and drilling fluids are generated, disposal of the investigation derived waste (IDW) will be required. Terracon requests that the City of Waterloo provide an area where the IDW can be disposed. Based on Terracon's experience with previous explorations, the City of Waterloo has accepted IDW at their facilities. If the City of Waterloo is unable to provide a disposal area, Terracon's exploration team will place the soil and drilling fluids in drums, transport the drums to an area designated by the City of Waterloo, and the drums will need to remain in that area until the results of analytical testing are completed and can be provided to a licensed landfill facility. Soils will be logged during drilling to document soil or rock type, color, and relative moisture. Although not expected, if impacted material is perceived to be encountered, Terracon will contact the City of Waterloo prior to further exploration. Fees associated with analytical testing and disposal at a licensed landfill facility are not included in Terracon's current scope of services and fee. Safety and Underground Utility Locations: The client or others shall secure all necessary site related approvals, permits, licenses, and consents necessary to commence and complete the services and will execute any necessary site access agreement. Consultant will be responsible for supervision and site safety measures for its own employees, but shall not be responsible for the supervision or health and safety precautions for any third parties, including Client's contractors, subcontractors, or other parties present at the site. In addition, Consultant retains the right to stop work without penalty at any time Consultant believes it is in the best interests of Consultant's employees or subcontractors to do so in order to reduce the risk of exposure to the Responsive • Resourceful • Reliable 3 Preliminary Engineering for Replacement of the North Well Hawthorne Avenue Pumping Station Waterloo, Iowa April 15, 2022 Terracon Proposal No. P13217071B lrerracon coronavirus. Client agrees it will respond quickly to all requests for information made by Consultant related to Consultant's pre -task planning and risk assessment processes. Upon completion of staking, Terracon will notify Iowa One Call to request the location and marking of public utilities, at least 48 hours prior to performing borings/excavations. We will consult with the owner/client regarding potential private utilities, or other underground hazards. Based on the results of this consultation, Terracon will consider the need for alternative subsurface exploration methods; as the safety of our exploration team members and avoiding damage to existing improvements are priorities. Any private utilities should be marked by the client or owner prior to subsurface exploration. Terracon will not be responsible for damage to utilities that are incorrectly marked or not made aware to us. If the client is not able to accurately locate private utilities, Terracon can assist the client by coordinating or subcontracting with a private utility locating service. Please note that our scope of services and fee does not include the location and marking of private utilities. Site Access and Property Disturbance: We considered that the site and boring location can be accessed using our ATV -mounted drill rig and 4-wheel drive support truck. Terracon personnel will take reasonable measures to limit the amount of damage to the property. However, some rutting of the ground surface, and/or damage to landscape could occur. Please note that our scope of services and fee do not include services associated with site clearing, wet ground conditions, or repairing damage to existing landscape. If such services are desired by the City of Waterloo, we should be notified so we can adjust our scope of services and fee. It is important that Terracon be granted access to the site (or legal right of entry) by the property owner. At least 3 days advanced notice will be provided to the City of Waterloo of our intent to notify Iowa One Call and perform the subsurface exploration. We will backfill the boreholes with bentonite grout to within about 2 feet of the ground surface and backfill the remainder of the boreholes with a mixture of bentonite chips and soil cuttings upon completion. Our services do not include repair of the site beyond backfilling our boreholes. Any excess auger cuttings and drilling fluids will be removed from the site, as previously described. Because backfill material often settles below the surface after a period, we recommend the boreholes to be periodically checked and backfilled, if necessary. Laboratory Testing The project engineering team will review field data and assign laboratory tests to aid in our evaluation of the engineering properties of the various soil and rock strata. Exact types and number of tests cannot be defined until completion of field work. Anticipated laboratory testing includes the following: Water content Combined sieve and hydrometer analysis Responsive • Resourceful • Reliable 4 Preliminary Engineering for Replacement of the North Well Hawthorne Avenue Pumping Station Waterloo, Iowa April 15, 2022 Terracon Proposal No. P13217071B lrerracon Our laboratory testing program also includes examination of soil samples by an engineer. Based on the material's texture and plasticity, we will describe and classify soil samples in general accordance with the Unified Soil Classification System (USCS). Engineering and Project Delivery Results of our field and laboratory programs will be evaluated by an experienced geotechnical engineer licensed in the State of Iowa. The engineer will develop a hydrogeological site characterization, perform the engineering evaluations necessary to provide recommendations regarding the proposed replacement well. If requested, your project can be delivered using our Client Portal system. Upon receipt of authorization, we will provide you and your design team the necessary link and password to access the website. The typical delivery process includes the following: Project Planning — Proposal information and the schedule and anticipated exploration plan will be posted for review and verification Site Characterization — Findings of the site exploration Engineering — Recommendations regarding the proposed replacement well When our report has been completed, we can upload it to our Client Portal system website for you if requested or provide a `pdf file of it via email. Previous submittals, collaboration, and the report are maintained in our system to allow for future reference and integration into subsequent aspects of our services, as the project goes through final design and construction. The engineering report will include and/or address the following: General site and project description Site and Boring Location diagrams Stratified boring logs with field and laboratory data Subsurface exploration procedures Summaries of soil and groundwater conditions observed ■ Recommended engineering design parameters for replacement well The fees to conduct the next phase of the relief well replacement will be provided to the City of Waterloo after the recommended engineering design parameters for replacement well are determined. The next phase of the project will include development of a relief well Drilling Program Plan (DPP) with well specifications, installation, testing and reporting. After the relief well design parameters are developed, Terracon will prepare general well installation specifications and obtain bids from qualified well drilling firms for the City to review. Terracon will provide a Drilling Program Plan for review and approval by the City and the Corps of Engineers for the relief well installation. The DPP will also contain the anticipated testing, data analysis and as -constructed reporting requirements as listed in ER 1110-2-1914. Responsive • Resourceful • Reliable 5 Preliminary Engineering for Replacement of the North Well Hawthorne Avenue Pumping Station Waterloo, Iowa April 15, 2022 Terracon Proposal No. P13217071B C COMPENSATION lrerracon For the scope of services outlined in this proposal, we estimate a fee of $14,500 to $16,500. However, Terracon would only invoice for the services provided. Unless instructed otherwise, invoices would be submitted monthly to the addressee of this proposal. D PROJECT SCHEDULE Our schedule may be dependent on when we receive authorization to proceed. We can generally begin the subsurface exploration within about 15 working days after receiving authorization, the clearance of public and private site utilities, and any other access and permit permission. In some instances, weather and/or site conditions can delay our drilling schedule. E AUTHORIZATION This proposal may be accepted by the City of Waterloo by executing the attached Supplement to Agreement for Services and returning one copy along with this proposal to our Cedar Falls, Iowa office. In some instances, we can proceed with verbal approval; however, we request that written authorization still follow. This proposal is valid for 30 days. After 30 days we reserve the right to re -visit our material and fuel cost and adjust our pricing structure accordingly. We appreciate the opportunity to provide this proposal and look forward to the opportunity of working with you. Sincerely, Terracon Consultants, Inc. Dave C. Cleary, REM Environmental Department Manager Attachments: Supplement to Agreement for Services Copies to: Client (email) Jerry T. Hentges, PG Senior Hydrogeologist Responsive • Resourceful • Reliable 6 jferracon Reference Number: 13217071 SUPPLEMENT TO AGREEMENT FOR SERVICES CHANGE TO SCOPE OF SERVICES AND FEES This SUPPLEMENT to AGREEMENT FOR SERVICES to the original Agreement for Services (original Agreement dated 07/19/2021, Agreement reference number P13217071) is between City of Waterloo IA ("Client") and Terracon Consultants, Inc. ("Consultant") for additional or changed Services to be provided by Consultant for Client on the Project, as described in the Agreement for Services. This Supplement is incorporated into and part of the Agreement for Services. Scope of Services. The scope of the additional or changed Services are described in the Scope of Services section of the Consultant's Supplemental Proposal, unless Services are otherwise described below or in Exhibit B to this Supplement (which section or exhibit are incorporated into the Supplement). See attached Terracon Proposal P13217071B dated April 15, 2021 Compensation. Client shall pay compensation for the additional or changed Services performed at the fees stated in the Supplemental Proposal unless fees are otherwise stated below or in Exhibit C to this Supplement (which section or exhibit are incorporated into the Supplement). See attached Terracon Proposal P13217071B dated April 15, 2021 All terms and conditions of the Agreement for Services shall continue in full force and effect. This Supplement is accepted and Consultant is authorized to proceed. Consultant: Terracon Consultants, Inc. By: Name/Title: Date: 4/15/2022 Dave C. Cleary, REM / Environmental Department Manager Address: 3105 Capital Way, Ste 5 Cedar Falls, IA 50613-7030 Phone: (319) 277-4016 Fax: (319) 277-4320 Email: Dave.Cleary@terracon.com Client: By: City of Waterloo IA Qet 1-Ear( Quentin Hart / Mayor Date: 05/02/2022 Address: 715 Mulberry St Phone: Email: Waterloo, IA 50703-5714 (319) 291-4312 Fax: wayne.castle@waterloo-ia.org Page 1 of 1 Rev. 8-12