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Home My WebLink AboutTerracon - PSA Hawthorne Ave Pumping Station - 12.6.2021 lrerracon November 17, 2021 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: Supplemental Proposal for Remediation of the North Well Hawthorne Avenue Pumping Station Waterloo, Iowa Terracon Proposal No. P13217071A Dear Mr. Castle: Terracon Consultants, Inc. (Terracon) appreciates the opportunity to submit this proposal for remediation 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 submitted a Relief Well Assessment report (Terracon Project 13217071, dated November 12, 2021)for the North and South wells at the site. Based on the testing results at the North Well, Terracon recommended that additional remediation actives be conducted to remove the river silt that was unable to be removed by bailing the well. The follow activities should be conducted on the North Well: Using Airlift equipment, clear well to bottom Inject approximately 3,000-gallons of 300 ppm Chlorine and Nu-Well 220 polymer dispersants into the well Use airlift equipment with a double disc surge block to simultaneously surge and airlift each 3-4' section of the screened area for a minimum of 30-45 minutes Conduct downhole video survey of the well Perform 3-point pump test of well and recorded measurements of discharge, drawdown and sand content Terracon Consultants, Inc. 3105 Capital Way Suite 5 Cedar Falls, Iowa 50613 P [319] 277-4016 F [319] 277-4320 terracon.com Proposal for Remediation of the North Well Irerracon Hawthorne Avenue Pumping Station Waterloo, Iowa November 17, 2021 ■ Terracon Proposal No. P13217071A 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. The scope of services to be provided by Terracon for this project follows. B.1 Field Services Terracon will team with Cahoy Pump Service for this project. Work includes providing labor, materials, equipment, supervision, mobilization/demobilization, and cleanup to perform remediation activities on the North well. The scope of services will include the following: ■ Prep & mobilize to site ■ Remove well cap ■ Provide & Install Airlift equipment to clear well to bottom ■ Remove Airlift Equipment Install a 3,000-gallon batch of 300PPM Chlorine & NW220 solution Provide / Install airlift equipment & double disc surge block Simultaneously surge & airlift each 3-4' section of the screened area for a minimum of 30-45 minutes throughout the length of the screened area ■ Remove airlift equipment ■ Perform final TV survey of the well ■ Clear site & demobilize ■ Disinfect well & reinstall cap Perform 3-point pump test of the North Well with recorded measurements of drawdown and discharge including sand content Site Access and Property Disturbance: We considered that the site and well location can be accessed using truck-mounted equipment. Terracon personnel will take reasonable measures to limit the amount of damage to the property. However, some damage to pavements, rutting of the ground surface, and/or damage to landscape could occur. Proposal assumes discharge within 100 feet of the well or less. Assuming the water is clean, we understand the discharge will be to the grass areas south of the wells. A 90 degree bend will be placed at the end of the hose so the discharge shoots upwards, dispersing the water over a large area at less velocity. We understand that the discharge will not reach navigable Responsive ■ Resourceful ■ Reliable 2 Proposal for Remediation of the North Well Irerracon Hawthorne Avenue Pumping Station Waterloo, Iowa November 17, 2021 Terracon Proposal No. P13217071A waters and would be covered under NPDES General Permit #9 for temporary groundwater dewatering to facilitate construction activity and a Notice of Intent would not be required. Terracon will contact Iowa Department of Natural Resources regarding the requirements of a statewide permit. City of Waterloo will be responsible for local permitting. Laboratory Testing No laboratory testing has been requested for this project. Safety Terracon is currently not aware of environmental concerns at this project site that would create health or safety hazards associated with our field exploration program. Thus, the estimated fee includes our exploration team using standard Personal Protection Equipment (PPE) for geotechnical drilling including hard hats, safety glasses, hearing protection, high visibility vests, and steel-toed boots. Our scope of services does not include environmental site assessment services, but identification of unusual or unnatural materials encountered while drilling and/or sampling will be noted on our logs and discussed in our report. B.2 Transmittal Upon completion of site activities, Terracon will prepare a final transmittal that includes the following: ■ Documentation of field activities; Determination of the condition and adequacy of the relief well and current capacity based on the pump testing, C COMPENSATION For the scope of services outlined in this proposal, we estimate a fee of $56,800 to $58,750 as itemized in the attached Exhibit. 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. Responsive ■ Resourceful ■ Reliable 3 Proposal for Remediation of the North Well Irerracon Hawthorne Avenue Pumping Station Waterloo, Iowa November 17, 2021 ■ Terracon Proposal No. P13217071A 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 Jerr . ent e5. PG Environmental Department Manager Senior Hydrogeologist Attachments: Exhibit C-Budget Estimate Supplement to Agreement for Services Copies to: Client(email) Responsive ■ Resourceful ■ Reliable 4 BUDGET ESTIMATE Irerracon Remediation of North Well Hawthorne Avenue Pumping Station City of Waterloo 11/17/2021 Waterloo, Iowa P13217071A DESCRIPTION QUANTITY I UNIT UNIT PRIC EXTENSION FIELD SERVICES Refer to proposal for scope of services Pre-task Planning 1 - 1 lump sum $500.00 $ 500.00 500.00 Job Prep&Mobilization 1.0 - 1.0 each $4,500.00 $ 4,500.00 4,500.00 Set-up and Remove Well Caps 2.0 - 2.0 hour $330.00 $ 660.00 660.00 Air lift with compressor and specialized equiqment 1.0 - 1.0 lump sum $19,500.00 $ 19,500.00 19,500.00 Airlift well via double disc surge block to bottom 8.0 - 8.0 hour $420.00 $ 3,360.00 3,360.00 Install chloride solution w/NW220 10.0 - 10.0 hour $330.00 $ 3,300.00 3,300.00 Simultaneously surge w/double disc surge block&airlift well clear 8.0 - 8.0 hour $420.00 $ 3,360.00 3,360.00 Post TV of North well 1 - 1 each $3,075.00 $ 3,075.00 3,075.00 Chemical&Consumable Materials 1 - 1 lump sum $2,300.00 $ 2,300.00 2,300.00 Perform 3-point pump test 1 - 1 lump sum $8,010.00 $ 8,010.00 8,010.00 Project Manager 30.0 - 30.0 hour $125.00 $ 3,750.00 3,750.00 Subtotal $ 52,315.00 52,315.00 ESTIMATED FIELD SERVICES SUBTOTAL $ 52,300.00 to $ 52,300.00 ENGINEERING SERVICES Project Direction,Coordination, Data Reduction and Report Preparation. ME Senior Project Manager 16.0 - 24.0 hour $150.00 $ 2,400.00 $ 3600.00 Project Manager 16.0 - 22.0 hour $125.00 $ 2,000.00 $ 2750.00 Administration and Secretarial Services 2.0 -1 2.0 hour $50.00 $ 100.00 $ 100.00 Subtotal $ 4,500.00 $ 6450.00 ESTIMATED ENGINEERING SERVICES SUBTOTAL $ 4,500.00 to $ 6,450.00 ESTIMATED TOTAL FOR SCOPE OF SERVICES $ 56,800.00 to $ 58,750.00 Irerracon- 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. 1. 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 P13217021A dated November 17,2021. 2. 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 P13217021A dated November 17,2021. 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. Client: City of Waterloo IA By: Date: 11/17/2021 By: 0-1411 Hu J Date: 12/6/2021 Name/Title: Dave C.Cleary, REM /Environmental Name/Title: Quentin Hart/Mayor Department Manager Address: 3105 Capital Way,Ste 5 Address: 715 Mulberry St Cedar Falls, IA 50613-7030 Waterloo, IA 50703-5714 Phone: (319) 277-4016 Fax: (319) 277-4320 Phone: (319) 291-4312 Fax: Email: Dave.Cleary@terracon.com Email: wayne.castle@waterloo-ia.org Page 1 of 1 Rev.8-12