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RES 2022-0528 - Amend No. 1 to PSA with HDR Engineering for OPW 53907 - Papillion Creek Interceptor Rehabilitation - South 36th Street and Raynor ParkwayEXHIBIT "B" AMENDMENT NO. 1 SCOPE OF SERVICES FOR FINAL DESIGN OPW 53907 -PAPILLION CREEK SANITARY SEWER INTERCEPTOR REHABILITATION (RN): Geotechnical Investigations ARTICLE 1. SCOPE OF SERVICES This AGREEMENT provides for engineering services for geotechnical investigations (PROJECT) for the Rehabilitation of the section of the Sarpy County Interceptor known as the Papillion Creek Santitary Sewer Rehabilitation (RN). The PROJECT is located in Sarpy County Nebraska and with the limits generally described as beginning at the Papillion Creek Waste Water Recovery Facility (PCWRRF) located at 157005 Harlan Lewis Road in Bellevue, Nebraska 68005 and ending near the intersection of South 36th Street and Brook Drive in Bellevue, Nebraska 68123. The PROJECT will be based upon the preliminary design and field work completed as part of the OPW 53907 Papillion Creek Sanitary Sewer Interceptor Rehabilitation (RN). The proposed investigations will occur at Sites A, B, C, D, E, F, G, and Has described in the OPW 53907 Papillion Creek Sanitary Sewer Interceptor Rehabilitation (RN) contract. The PROJECT work will be performed as part of the overall Sarpy County Sanitary Sewer Interceptor Rehabilitation Program. ENGINEER will be required to comply with the written Plans, Protocols, Procedures, Standards, and Guidance documents adopted from the CSO Program that are applicable to the particular tasks being performed as part of this project. The CITY will set up a file sharing platform separate from the CSO program. This scope of services is organized in categories of project assumptions, project management, and major project design tasks. Major elements of work will include: Task 8: Geotechnical Investigations Task 9: Utility Location Drilling Program Plan Preparation 1 MAJOR PROJECT ASSUMPTIONS The following assumptions are specific to this amendment and are in addition to the assumptions contained in the original SCOPE OF SERVICES and previous AMENDMENTS. 1.The City's review comments will be submitted to Consultant within two weeks after submittal of the draft geotechnical report. 2.USACE review comments of the geotechnical report will be received in time to be addressed for the Section 408 submittal at 90% design. 3.The Operations and Maintenance manual for the levee system will be provided prior to completion of the technical memorandum. 4.The Drilling Program Plan approval process is anticipated to take between three and six months. 5.The utility location operations will be performed by a subconsultant and consist of vacuum excavation methods. TASK 8 -GEOTECHNICAL INVESTIGATIONS Objective: Provide geotechnical investigations, lab results and reporting for Sites A, B, C, D, E, F, G, H to support the ongoing rehabilitation design of the PROJECT. Deliverables: Geotechnical Exploration Drilling Program Plan (subconsultant); Geotechnical Report. Scope: 8.1 Coordination of Drilling, Lab Assignments, and Review Data ENGINEER to the field exploration program consisting of the following: Schedule of Borings Location Boring Number Boring Depth Site A B-1 30 feet Site B B-2 50 feet Site C B-3 50 feet Site D B-4 25 feet Site E B-5 30 feet Site F B-6 25 feet Site G B-7 50 feet Site H B-8 25 feet ENGINEER will hire a sub-consultant (Terracon Geotech) to perform the geotechnical drilling, sampling and laboratory materials testing. Sub-consultant will make a site visit to evaluate access to the boring location and to adjust the boring location, if needed. 2 8.6 Mitigate Underseepage Concerns ENGINEER will evaluate the need for special trench subgrade stabilization measures for support of the new storm sewer. ENGINEER will evaluate potential temporary slope configurations during installation of the storm sewer. 8.7 Meetings/Conference Calls ENGINEER will attend internal and external team meetings/conference calls as directed by the project manager. Including a site visit with NRD to confirm the access and bore locations. 8.8 Geotechnical/Design Report ENGINEER shall prepare and submit a PDF electronic version of the technical memorandum to the City of Omaha for review. ENGINEER shall then address review comments provided by the City of Omaha (if any) and submit a final PDF version of the geotechnical report. In addition to the results of the field investigation and lab testing program, the geotechnical report will address the following items: •Geologic setting; •Subsurface soil and groundwater conditions; •Evaluation of the engineering characteristics of the soils; •Evaluation of estimated settlements of the levee crest resulting from construction; •Evaluation of subgrade preparation needed for the proposed storm sewer; •Evaluation of potential temporary slope configurations during installation of the storm sewer; •Recommendations for construction. •Preparation of a technical memorandum presenting findings and geotechnical considerations for inclusion in USACE Section 408 submittal. Key Understandings and Assumptions for geotechnical field work: -USA CE approval of DPP will be provided within 90 days of submission.-Right of entry will be obtained by the CITY. The use of the levee crest for access will be avoided, where possible.-No testing for soil corrosivity will be completed.-No screening for potential petroleum hydrocarbons will be completed.-Abandonment of the monitoring well(s) will be completed by others as part of the construction project. TASK 9-UTILITY LOCATION DRILLING PROGRAM PLAN PREPARATION Objective: Prepare a Drilling Program Plan for utility location potholing work to be conducted by sub-consultant. (Potholing work to be executed via separate contract.) Deliverables: The key deliverables for this task will be a Utility Location Drilling Program Plan. Scope: 4 TASK SERIES TASK 8 -GEOTECHNICAL INVESTIGATIONS 8.1 Coordination of , Lab Assiimmcnts,Revicw Data 8.2 Develon Soil Desi1111 Parameters 8.3 Undcrsernm<1c Analysis 8.4 Settlement Analysis 8.5 Slope Stabilitv Analysis 8.6 Miti@te UndersePnll<>e Concerns 8.7 Mce11nuc11 onfcrcnce Calls 8.8 Geotechnical/Desism Reoort Subtotal Task 8 TASK 9-lITIUTY LOCATION OPP AND FIELD INSPECTIONS 9.1 Potholiru:!:DPP ation 9.2Potholin DPPFieldObservation Subtotal Task 9 TOTAL _l Task Series TASK 8 -GEOTECHNICAL INVESTIGATIONS 8.1 Coordination of Drilling, Lab Assignments,Revicw Data 8.4 Settlement Ana.!l'..sis 8.5 Slope Stability Analysis 8.6 Mitigate Underseepage Concerns 8.7 Meetings/Conference Calls 8.8 Geotechnical/Design Report TASK 9-lITIUTY LOCATION OPP AND FIELD Th/SPECTIONS )9.1 PotholingDPPPreparation 9.2 Potholing OPP Field Observation Task Series TASK 8 -GEOTEClmICAL INVESTIGATIONS 8.1 Coordination ofDrillin,g, Lab Assiimments,Revicw Data 8.4 Settlement Analysis 8.5 Slope Stabilitv Analysis 8.6 Miti@te Underse"""'"C Concerns 8.7 Mee11nucn onforence Calls 8.8 Geotcchnical/Desism Reoort TASK 9 -UTIUTY LOCATION DPP AND FIELD lliSPECilONS 9.1 Potholirul. DPP tion 9.2 Potholiru! DPP Field ObSCIVation TOTAL TOTAL: SENIOR PROJECT PM/ADVISOR PRIN'CIPAL 0 0 0 0 0 0 DIRECT COSTS Tnvel�ses Milea_g_e Cost $0.00 $0.00 40 $23.00 $0.001 S0.00 245 $l4Q88 285.00 $163.88 QC 0 0 0 Postage 50.00 PM CADD 8 18 3 29 0 2 4 6 0 JS 0 IPrint & Phot�1 Mapping and COpY Photos I $50.00 $50.00 50.00 EXHIBIT C-REHABillTATION FEE SUMMARY TocalLabor Direct Costs $5,720.03 $0.00 $7,528.20 $0.00 $7 528.20 $0.00 $4 042.03 $0.00 $9,247.89 $23.00 $17,098.92 $50.00 $9,869.00 $0.00 $12,121.91 $140.88 $88,051.75 $213.88 $196.!.013 CADD 10 10 8 90 98 108 Misc. $0.00 Subconsultants $102,617.00 $102 617.00 ASMEC PRODUCTION 0 0 0 Total S0.00 $0.00 $0.00 so.oo' $23.00 sso.oo' $0.00 $l4Q88 $213.88 Total $108,337.03 $7,528.20 $7.528.20 $4 042.03 $9,270.89 $17,148.92 $9,869.00 $12.262.78 $196 013.48 SR STRUCTURAL 0 0 0 GEOTECII SR GEOTECH CONfROllER 10 3 10 3 48 16 32 8 32 8 16 5 14 5 58 16 220 64 40 6 2 2 42 8 262 72 1s5,13o.ss 5% submarkupj HOR Cost Sub-consultant Cost Total Cost 10 10 0 10 WWEIT CIVIL TOTAL 5 36 13 64 40 40 21 12 49 8 95 0 25 358 2 58 6 104 0 8 162 0 33 520 Terracon Consultants, Inc. 15080 A Circle Omaha, Nebraska 68144 P (402) 330 2202 F (402) 330 7606 terracon.com PROPOSAL COVER PAGE January 25, 2022 HDR, Inc. 1917 S 67th Street Omaha, Nebraska 68106 Attn: Mr. Bryan Kumm – Geotechnical Engineer P: (402) 399.1147 E: bryan.kumm@hdrinc.com Re: Proposal for Geotechnical Engineering Services Sarpy County Interceptor Sewer Replacement S 36th Street to Missouri River Sarpy County, Nebraska Terracon Proposal No. P05225020 Dear Mr. Kumm: We appreciate the opportunity to submit this proposal to HDR, Inc. (HDR) to provide Geotechnical Engineering services for the above referenced project. The following are exhibits to the attached proposal. Exhibit A Project Understanding Exhibit B Scope of Services Exhibit C Compensation and Schedule Exhibit D Requested Exploration Plans Please see Exhibit C for details concerning our fees to perform the scope of services described in this proposal. We understand HDR will issue a Subconsultant Agreement for Geotechnical Services for this project. Please contact us if the there are any questions concerning this proposal. Sincerely, Terracon Consultants, Inc. Gopala K. Allam, E.I. Michael D. Ringler, P.E. Sr. Staff Engineer Senior Engineer Distribution: Addressee (pdf) Mr. Jake Sellin, HDR (pdf) Proposal for Geotechnical Engineering Services Sarpy County Interceptor Sewer Replacement Sarpy County, Nebraska January 25, 2022 Terracon Proposal No. P05225020 Responsive Resourceful Reliable EXHIBIT B – SCOPE OF SERVICES 1 of 7 EXHIBIT A - PROJECT UNDERSTANDING Our scope of services is based on our understanding of the project as described by HDR. We have/have not visited the project site to review surface features or access conditions. Site visit will be performed as part of site reconnaissance prior to mobilization to the site. Aspects of the project which are undefined or assumed are highlighted. We request the design team verify this information prior to initiation of field exploration activities. Site Location and Anticipated Conditions Item Description Parcel Information The project is located between S 36th Street to Missouri River on north/east side of Papillion Creek in Sarpy County, Nebraska. Existing Improvements / Current Ground Cover Existing interceptor sewer alignment. Papio-Missouri River NRD Flood Protection Levee along both banks of Papillion Creek channel. Several culverts and stormwater outlets. The grounds are grass and/or tree covered. Site Access We expect the site and all exploration locations are accessible with our ATV- mounted drilling equipment, except for one boring proposed within the wooded areas near Offutt Air Force Base Gate will likely require tree clearing operations which are not included in this quote. Expected Subsurface Conditions Our experience near the vicinity of the proposed development and geologic maps indicates subsurface conditions consist of man-made fill, alluvial clay and silt soils overlying sand. Planned Construction Item Description Information Provided Sarpy County Interceptor Sewer Replacement (OPW 53269) for Sites A, B, C, D, E, F, G, H Sarpy County, Nebraska. Proposed Scope of Work for Fee Estimate, Drilling and Laboratory Test Program. Project Description Replacement of interceptor sewer at road crossings and drainage channels crossings. EXHIBIT B - SCOPE OF SERVICES Our proposed scope of services consists of field exploration, laboratory testing, and engineering/ report delivery. These services are described in the following sections. Proposal for Geotechnical Engineering Services Sarpy County Interceptor Sewer Replacement Sarpy County, Nebraska January 25, 2022 Terracon Proposal No. P05225020 Responsive Resourceful Reliable EXHIBIT B – SCOPE OF SERVICES 2 of 7 Generating Drilling Program Plan (DPP) The site is within the jurisdictional zone of the City of Omaha, Papillion Creek Flood Protection Levee. The levee sponsor Papio-Missouri River NRD and the Corps of Engineers require notification whenever soil borings are planned within the jurisdictional zone. ER 1110-1-1807 (Drilling in Earth Embankment Dams and Levees, generated by the U.S. Army Corps of Engineers (COE), dated December 31, 2014) establishes policy and requirements and provides guidance for drilling in dam and levee earth embankments and/or their earth and rock foundations. This document requires development and approval of a Drilling Program Plan (DPP) prior to any drilling, sampling, grouting, or any other invasive in-situ testing or exploration. We will generate a DPP in general accordance with ER 1110-1-1807, and submit it to the client for review. The DPP will address all potential aspects of the field exploration which could occur. Upon concurrence, this document will be forwarded to the levee sponsor and the COE. Field Exploration Site Access: In order to conduct our field services, we must be granted access to the site by the property owner. We consider accepting this proposal, without information to the contrary, as permission to access the property (including access routes) for the purpose of conducting the field exploration. Our scope does not include determining access routes or negotiating site access with the levee sponsor or adjacent property owners. We will not drive our equipment over the levee and so request the access routes not traverse over the levee. Exploration Program: HDR requested the following boring locations and depths: Boring No. Type Boring Depth (feet)1 Planned Location 2, 3 B-1S Boring 30 Along sewer alignment – Site A B-2S Boring/Observation Well 50 Along sewer alignment – Site B B-3S Boring/Observation Well 50 Along sewer alignment – Site C B-4S Boring 25 Along sewer alignment – Site D B-5S Boring 30 Along sewer alignment – Site E B-6S Boring 25 Along sewer alignment – Site F B-7S Boring/Observation Well 50 Along sewer alignment – Site G B-8S Boring 25 Along sewer alignment – Site H Proposal for Geotechnical Engineering Services Sarpy County Interceptor Sewer Replacement Sarpy County, Nebraska January 25, 2022 Terracon Proposal No. P05225020 Responsive Resourceful Reliable EXHIBIT B – SCOPE OF SERVICES 3 of 7 Boring No. Type Boring Depth (feet)1 Planned Location 2, 3 1.Referenced depth is below existing ground surface or to practical auger refusal, whichever is shallower. 2.Refer to Exhibit D. 3.As requested by HDR, the boring will be terminated if contamination is encountered. The RFP also requested Terracon’s scope include a contingency boring: Boring Number of Borings Boring Depth (feet)1 Contingency Boring 1 25 1. Referenced depth is below existing ground surface or to practical auger refusal, whichever is shallower. Boring Layout and Elevations: We will use handheld GPS equipment to locate borings with an estimated horizontal accuracy of 1 foot and vertical accuracy of 0.5-foot. If precise locations and elevations are desired, we suggest that the client retain a licensed surveyor to stake the boring locations and provide elevations. Subsurface Exploration Procedures: We will advance the soil borings with an ATV-mounted drill rig using continuous hollow-stem augers and wash boring techniques to advance the boreholes with water added for balancing groundwater pressure. Sampling in the borings will be in general accordance with industry standard procedures. Samples will be obtained at 2.5 ft intervals within fill and/or to a depth of 10 feet below ground surface, otherwise samples will be obtained at intervals of about 5 feet. Both thin-walled Shelby tubes and split-barrel samples will be obtained. The samples will be placed in appropriate containers and taken to our soil laboratory for testing. Field logs will be provided to HDR within 2 days following drilling and laboratory testing will be assigned by HDR. In addition, we will observe and record groundwater levels in the boreholes during drilling and sampling, after each boring is completed, and quarterly in the observation wells for 1 year after installation. Borings will be backfilled with high-solids bentonite grout unless an observation well is installed. Our exploration team will include an experienced field engineer or geologist who will prepare field boring logs. The field logs will include sampling depths, penetration distances, and other relevant sampling information. Field logs will also include visual classifications of materials encountered during drilling, and our interpretation of subsurface conditions between samples. Typed boring Proposal for Geotechnical Engineering Services Sarpy County Interceptor Sewer Replacement Sarpy County, Nebraska January 25, 2022 Terracon Proposal No. P05225020 Responsive Resourceful Reliable EXHIBIT B – SCOPE OF SERVICES 4 of 7 logs included with the report will represent the geotechnical engineer's interpretation of the field logs, and include modifications based on laboratory observations and tests. Groundwater Observation Well Installation: As requested, groundwater observation wells estimated to be about 50 feet below ground surface (bgs) will be installed at three boring locations. The observation wells will be constructed with two-inch nominal diameter, flush threaded, PVC, well pipe. The wells will be constructed with a well point and 20 feet of 0.01-inch wide, manufacturer slotted, well screen placed at or near the bottom of the boring. The screen will be attached to solid- stem riser pipe, extended above the ground surface by about 2 to 3 feet, and capped with an expansion locking cap. The annulus around the outside of the well will be backfilled with sand from the bottom of the boring to approximately 2 feet above the top of the screen. Non-slurry bentonite grout (e.g., chips) will be placed from the top of the sand to the bottom of an 8-inch thick by 36-inch diameter concrete pad placed at the ground surface. The well will be terminated in a steel protector pipe encased in the concrete pad protected by safety bollards, developed, and registered with the State of Nebraska Department of Natural Resources (NDNR) as an observation well. Decommissioning costs are not included in this proposal. As requested, one slug test will be performed at each observation well. Property Disturbance: Borings will be backfilled with high-solids bentonite grout unless an observation well is installed. Excess auger cuttings and drilling fluids will be dispersed in the general vicinity of the boreholes. Because backfill often settles below the surface after a period, the RFP requests Terracon make a return trip to top-off the grout at the borings. Our scope of services does not include site clearing, wet ground conditions, tree or shrub clearing, or repair of/damage to existing landscape. If such conditions are present, we should be notified so we can adjust our boring locations or fees. We have provided a small contingency for site restoration, traffic control, and tree clearing. Actual cost for site restoration, traffic control, tree clearing will be passed on at cost+15%. Our field equipment includes heavy drill rigs and support vehicles carrying water tanks. We request access routes be provided such that traversing over the levees is avoided. We will take reasonable efforts to avoid excessive damage or rutting due to our equipment; however, the extent of damage will highly depend on the near-surface soil moisture content and presence/absence of frost or poor drainage. At a minimum, the field equipment will leave depressions several inches deep in even dry weather with firm ground conditions. Similarly, tracked equipment will tear through vegetation and roots. More disturbance occurs during wet weather and in soft ground conditions. Safety: Employee safety is a core value of Terracon, and we are committed to an Incident and Injury-Free (IIF) workplace. This commitment is at all levels of our company to ensure that everyone goes home safe to their family every day. All employees are expected to perform their job assignments with safety as a primary objective. Field work will be performed following Proposal for Geotechnical Engineering Services Sarpy County Interceptor Sewer Replacement Sarpy County, Nebraska January 25, 2022 Terracon Proposal No. P05225020 Responsive Resourceful Reliable EXHIBIT B – SCOPE OF SERVICES 5 of 7 Terracon-performed Pre-Task Planning and Tailgate meetings to discuss the potential safety hazards and reinforce project objectives and procedures. We will contact the local “one-call” service for location of utilities in public easements. Locating private lines on the property is not part of the “one-call” or our scope. All private lines should be marked by the owner/client prior to commencement of field exploration. We are not responsible for damage to private utilities that are not made aware to us. If the owner/client is not able to accurately locate private utilities, we can assist the owner/client by coordinating or subcontracting with a private utility locating services and/or utilize geophysical equipment. Fees associated with these additional services are not included in our current cost and will be forwarded to our client for approval prior to initiating. The detection of underground utilities is dependent upon the composition and construction of the utility line; some utilities are comprised of non-electrically conductive materials and may not be readily detected. The use of a private locate service would not relieve the owner of responsibility in identifying private underground utilities. We are not aware of any environmental concerns at this project site that would create health or safety hazards associated with our exploration program; thus, our scope considers that Level D Personal Protection Equipment (PPE) is appropriate. Our scope of services does not include any level of environmental site assessment services, but unusual or unnatural materials encountered while drilling will be noted on our logs. Our field crew will make excavations into the ground and, as such, these excavations could encounter subsurface utilities and/or environmental hazards that could be harmful to our field crew. We have dedicated significant time, resources and training necessary for an IIF environment, and all employees are authorized to ‘stop work’ if unsafe conditions are identified during the field exploration. If there is potential to encounter unknown or unmarked underground hazards, we will reevaluate site conditions and propose alternative methods to proceed with the excavations to ensure the safety of our field crew. The owner/client will be consulted regarding possible alternative methods and authorization will be received from the owner/client prior to proceeding with the field work. In order to reduce the risk of exposure to the coronavirus, Terracon retains the right to stop work without penalty if it is in the best interest of our employees or subcontractors. Client agrees it will respond quickly to all requests for information made by Terracon related to our pre-task planning and risk assessment processes. Client acknowledges its responsibility for notifying Terracon of any circumstances that present a risk of exposure to the coronavirus or individuals who have tested positive for COVID-19 or are self-quarantining due to exhibiting symptoms associated with the coronavirus. Proposal for Geotechnical Engineering Services Sarpy County Interceptor Sewer Replacement Sarpy County, Nebraska January 25, 2022 Terracon Proposal No. P05225020 Responsive Resourceful Reliable EXHIBIT B – SCOPE OF SERVICES 6 of 7 Laboratory Testing Laboratory testing will be assigned by HDR. For budgeting purposes, the testing is assumed to include the following under the base fee. ASTM D2216 Standard Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass, 41 tests ASTM D7263 Standard Test Method for Laboratory Determination of Density (Unit Weight) of Soil Specimens, 16 tests ASTM D2166/D2166M Standard Test Method for Unconfined Compressive Strength of Cohesive Soil, 16 tests ASTM D4318 Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils, 16 tests ASTM D422 Standard Test Method for Particle-Size Analysis of Soils with Sieve and Hydrometer, 11 tests ASTM D2435/D2435M Standard Test Methods for One-Dimensional Consolidation Properties of Soils Using Incremental Loading, 3 tests Our laboratory testing program includes review of the soil samples by an engineer. Based on the material’s texture and plasticity, we describe soil samples in general accordance with the Unified Soil Classification System (USCS). Data Report Delivery The results of our field and laboratory programs will be reviewed and summarized by a geotechnical engineer. and a data report prepared. The report will be delivered using our GeoReport system. Upon authorization, we will provide you and the design team the necessary link and password to access the website (if you don’t already have one). Each project includes a calendar to track the schedule, an interactive site map, a listing of team members, access to all project documents as they are uploaded, and a collaboration portal. A typical delivery process includes two stages: Stage 1: Project Planning Stage 2: Site Characterization Stage 3 Geotech. Data Report When services are complete, we will upload a printable version of our geotechnical data report. All previous submittals, collaboration, and the report will be maintained in our system indefinitely to allow future reference and integration into subsequent aspects of our services. Proposal for Geotechnical Engineering Services Sarpy County Interceptor Sewer Replacement Sarpy County, Nebraska January 25, 2022 Terracon Proposal No. P05225020 Responsive Resourceful Reliable EXHIBIT B – SCOPE OF SERVICES 7 of 7 The Geotechnical Data Report will provide the following: Project description Site description Computer generated boring logs with: o soil stratification based on visual soil classification (Unified Soil Classification System) o summarized laboratory data o groundwater levels observed in the borings o ground surface elevation Plotted laboratory (consolidation, rock compression and gradation test results) Site and/or boring location plans provided by HDR Description of field exploration and laboratory testing procedures Site description (existing) Summary description of subsurface conditions SPT hammer calibration report(s) Proposal for Geotechnical Engineering Services Sarpy County Interceptor Sewer Replacement Sarpy County, Nebraska January 25, 2022 Terracon Proposal No. P05225020 Responsive Resourceful Reliable EXHIBIT C – COMPENSATION AND SCHEDULE 1 of 3 EXHIBIT C - COMPENSATION AND SCHEDULE Compensation Our fee(s) quoted in the following table are based upon our understanding of the site conditions, the project as summarized in Exhibit A, and our planned scope of services outlined in Exhibit B. Service Item Quantity Unit Unit Rate Total Cost Drilling Program Plan with hydrofracture analysis 1 L.S. $5,500 $5,500 Mob/Demobilization with daily travel 1 L.S. $3,500 $3,500 Support Truck 8 Day $100 $800 Draft Health and Safety Work Plan 1 L.S. $2,500 $2,500 Drill crew on-site coordination and access 14 Hour $300 $4,200 Safety Tailgate 8 Hour $300 $2,400 Drilling and Sampling with Observation Well Installation 150 Foot $70 $10,500 Drilling and Sampling (ATV) 135 Foot $35 $4,725 Cold weather drilling (hot water allowance) 1200 Gallon 0.60 $720 Grouting 135 Foot $15 $2,025 Return trip to top off grout 1 L.S $2,500 $2,500 Geologist or Field Engineer1 96 Hour $130 $12,480 Well surface completion 3 each $500 $1,500 Well registration 3 Each $500 $1,500 Slug test 3 Each $1,300 $3,900 Trips to obtain quarterly groundwater levels 27 Hour $130 $3,510 Liquid and Plastic Limits 16 test $120 $1,920 Moisture Content 41 test $12 $492 Dry Density 16 test $15 $240 Sieve Analysis w/ hydrometer 11 test $165 $1,815 Unconfined Compression Test 16 test $35 $560 1-d Consolidation Test 3 test $500 $1,500 Recon, Boring Layout and Elevations, Project Management, Data Review, Report 1 L.S. $6,500 $6,500 Allowance for site restoration, if required (cost+15%) $8,000 Proposal for Geotechnical Engineering Services Sarpy County Interceptor Sewer Replacement Sarpy County, Nebraska January 25, 2022 Terracon Proposal No. P05225020 Responsive Resourceful Reliable EXHIBIT C – COMPENSATION AND SCHEDULE 2 of 3 Allowance for traffic control, if required (cost+15%) $3,000 Tree clearing, if required (cost+15%)2 $4,000 Total: $90,287 1. Field Engineer/Geologist with perform PID readings and log samples from borings. 2. One boring near Offutt Air Force Base Gate may need some tree clearing Contingency Boring Service Item Quantity Unit Unit Rate Total Cost Revise Drilling Program Plan 1 L.S $1,400 $1,400 Mob/Demob 1 L.S. $1,300 $1,300 Support Truck 1 Day $100 $100 Safety Tailgate 1 Hour $300 $300 Drill crew on-site coordination and access 2 Hour $300 $600 Drilling and Sampling, Soil (ATV) 25 Foot $35 $875 Cold weather drilling (hot water allowance) 300 Gallon 0.60 $180 Grouting 25 Foot $15 $375 Geologist or Field Engineer 10 Hour $130 $1,300 Return trip and topping off grout 1 Each $750 $750 Obtain quarterly groundwater levels 5 Hour $130 $650 Recon, Boring Layout and Elevations, Project Management, Data Review, Report 1 L.S. $2,500 $2,500 Contingency for site restoration, if required (cost+15%) $2,000 Total: $12,330 Unless instructed otherwise, we will submit our invoice(s) to the address at the beginning of this proposal. If we are authorized to proceed and the client subsequently postpones or cancels the work, we will invoice the client for the costs of project set up and mobilization incurred prior to notice of cancellation. If conditions are encountered that require scope of work revisions and/or result in higher fees, we will contact you for approval, prior to initiating these services. A supplemental proposal stating the modified scope of services as well as its effect on our fee will be prepared. We will not proceed without your authorization. Our fee does not include time for unplanned standby. Standby time will be charged at a rate of $300 per hour for our drill crew. Time associated with engineers to attend meetings or telephone conference calls will be charged at a rate of $130/hour for Project Engineer, $180/hour for Senior Engineer, and $195/hour for Proposal for Geotechnical Engineering Services Sarpy County Interceptor Sewer Replacement Sarpy County, Nebraska January 25, 2022 Terracon Proposal No. P05225020 Responsive Resourceful Reliable EXHIBIT C – COMPENSATION AND SCHEDULE 3 of 3 Principal. Mileage for travel to/from meetings will be charged at a rate of $0.68/mile. We will obtain your authorization prior to incurring additional costs. Schedule We propose the following schedule to complete the scope of services, based upon our existing availability. However, this schedule does not account for any delays in field exploration beyond our control, such as weather conditions, permit delays, site access constraints, or lack of permission. Please contact us if the following schedule is inconsistent with your needs. We understand that HDR will submit the DPP to the USACE. After approval of the DPP, we anticipate starting the field exploration within about 10 to 14 days, provided weather and site conditions permit. GeoReport Stage Posting Date 1, 2 Project Planning 5 days from notice to proceed Field Exploration 10 to 14 days after receiving USACE approval Geotech. Data Report 30 to 40 days after completion of field exploration 1.Upon receipt of notice to proceed and USACE permits, we will activate the schedule component of our GeoReport website with calendar dates for the three delivery points noted above as well as other pertinent events such as field exploration crews on-site, etc. 2.We will maintain a calendar of activities within our GeoReport website. The schedule will be updated as needed to maintain a current awareness of our plans for delivery.