ATTACH 1 - Statement Of Work (SOW).pdf

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Chena Relief Wells Pump Federal contract opportunity
Solicitation number
W911KB26RA025
Issued by
Department of the Army Corps of Engineers Engineering District Alaska

About this file

This document is a comprehensive Statement of Work (SOW) for relief well maintenance and pump testing at the Chena River Lakes Flood Control Project in North Pole, Alaska. The project involves maintaining 140 relief wells through a detailed technical process including initial documentation, step-drawdown pump testing, cleaning and maintenance of wells with performance below 80% efficiency, and comprehensive reporting. The work will be performed on a U.S. Army Corps of Engineers military installation, with specific requirements including using a submersible pump capable of delivering a minimum 350 GPM, conducting multi-step drawdown tests, measuring sand infiltration, and removing sediment from wells.

Key project dates include a work plan submission due by April 10, 2026, field work completion by September 30, 2026, and final report submissions by November 20, 2026. The contractor must provide detailed documentation including a Work Plan, Quality Control Plan, Accident Prevention Plan, draft and final Relief Well Maintenance Pumping Reports, and Project Files Reports. Technical specifications mandate professional engineering supervision, precise testing protocols following ASTM and USACE guidelines, and strict quality control measures. The project requires specialized equipment, coordination with USACE project personnel, and adherence to specific site access and safety protocols on an active military installation.

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Moose Creek Dam Relief Well Maintenance and Pump Test Report

Proposal Bid Schedule

Base Items Item Description Units Qty Unit

Price Subtotal

Work Plan, Quality Control Plan, and Accident Prevention Plan Each 1

2 Mobilization/demobilization Site 1

Documentation and Initial Drawn Down Pump Test

Each 140

Cleaning and Maintenance of Low Performance Wells

Each 70

5 Re-Test Relief Well Efficiency Each 70

6 Reporting Each 1

Base Items Total

STATEMENT OF WORK

Contract No. W91KB-26-XXXX

Relief Well Performance and Maintenance

Moose Creek Dam

North Pole, Alaska

18 August 2025

GENERAL

This statement of work is for relief well maintenance in support of a geotechnical site investigation conducted for the Chena River Lakes Flood Control project located on Moose Creek Dam in North Pole, Alaska. The project is located on an active and secure United States Government military installation. A project location and vicinity map is provided as Government Furnished Information

(GFI) GFI-1.

Services will not be provided which are considered closely related to inherently governmental functions. The government will not supervise, direct, or have any direct control over the Contractor’s personnel. The Contractor and not as an agent of the Government, will, in accordance with the terms and conditions of the contract, furnish all labor, management, facilities, supplies, equipment and material (other than those to be furnished by the Government as hereinafter provided), and do all tasks necessary for performance of the work as set forth below.

The Contractor will furnish the required personnel, equipment, instruments, and transportation, as necessary to accomplish the required services and furnish to the Government reports is and other data together with supporting material developed during the period of service. During the execution of the work, the Contractor will provide adequate professional supervision and quality control to assure the accuracy, quality, completeness, and progress of the work.

Purpose

This work is to maintain relief wells by visually inspecting, removing sediment, and performing drawdown tests, maintenance and geotechnical step drawdown pumping tests as required. The work in this contract will be divided into five subtasks:

Prepare work plan.

Perform step drawn-down pump test on each well.

Brush and surge only wells that do not perform at minimum efficiency of 80%.

Re-test pump efficiency on all cleaned wells.

Prepare a relief well maintenance pump report.

The wells in this scope of work may require a smaller pump to conduct the step drawdown test.

The following deliverables will be provided:

Work Plan.

Draft Relief Well Maintenance Pumping Report.

Final Relief Well Maintenance Report.

Draft Project Files Report.

Final Project Files Report.

The project is located on the Chena River Lakes Flood Control Project commonly referred to as Moose Creek Dam in North Pole, Alaska. A project location and vicinity map is provided as Government Furnished Information GFI-1.

Project Background

The Chena River Lakes Flood Control Project is located approximately 18 miles east of Fairbanks, Alaska, near the city of North Pole. The Project encompasses approximately 20,000 acres of Federal land owned and operated by the U.S. Army Corps of Engineers, Alaska District.

The project consists of a combination of features including an embankment, stability berm, relief wells, and a control structure. The embankment and the stability berm are parallel features initiating near the Tanana River and extending perpendicular from the Tanana in a north-northeast direction to an unnamed ridge; the embankment is stationed along the center line. Laurance Road is constructed on top of the stability berm along the embankment between the Richardson Hwy and the Chena River. The stability berm is used as an unpaved access road to the north of the Chena River and to the south of the Richardson Highway. The relief wells parallel the downstream side of the stability berm/Laurance Road centerline, offset by 50 to 200 feet. Relief wells are also located on the upstream side of Laurance Road in between the dam embankment and stability berm from station 279+00 to 309+00. The relief wells are marked and identified by station numbers either in white paint marker or stamped into the well head top. Well locations are shown on Relief Well Location Maps in GFI 2.

The project relief wells provide under seepage relief during high water events. They accomplish this by tapping into the substratum and provide pressure relief in a controlled manner with low flow resistance, which prevent uncontrolled piping and erosion of the foundation soils.

Impermeable rock is assumed to be 600 feet below the ground surface at the control works and could be as deep as 1,000 feet in areas. The relief wells have been developed and had a step-drawdown pump test performed in 2022 that is used as a baseline for the health of wells at the project. It is necessary to develop an individual health record for each relief well. Background and existing information will be furnished to the Contractor in the GFI’s.

Government Furnished Items (GFI’s)

The Contractor will be provided the following GFI’s to assist in performing the work, to be provided in electronic PDF format or as specified.

GFI-1: Project Location and Vicinity Map GFI-2: Relief Well Locations GFI-3: Typical Relief Well Diagram GFI-4: Relief Wells to be Tested GFI-5: 2024 Moose Creek Dam Relief Well Inventory GFI-6: 2022 Relief Well Testing Report (Global Hydro) GFI-7: Relief Well Pumping Test Report Forms

Definitions

Whenever the term “Government” is used herein, it refers to the U.S. Army Corps of Engineers, Alaska District (USACE-AD). Whenever the term “Contractor” is used, it refers to the Architect- Engineer performing the work specified.

Responsibility

The Contractor shall furnish sufficient technical, supervisory, and administrative personnel to ensure that all tasks specified in this Statement of Work (SOW) are accomplished in a professional and expeditious manner. The Contractor shall furnish all services, materials, apparatus, supplies, equipment, manpower, required insurance, permits, travel arrangements, and any other items required in connection with this SOW. All work must be performed in accordance with this statement of work or modifications, applicable drawings, local regulations and building codes. All technical work must be supervised by a registered professional civil engineer with at least 5 years’ experience related to aquifer and water well testing, maintenance and performance.

Direction

The Contractor must accept directions only from the Government’s Contracting Officer (KO) or the duly authorized Contracting Officer's Representative (COR). Requests or desires of the users or using agency made directly to the Contractor will be immediately brought to the attention of the KO or COR. The KO is solely responsible for authorizing any changes to the project scope or other provisions of this statement of work, documented in writing.

The Contracting Officer (KO) for this work is:

Name: George Nasif Phone: (907) 753-2838 Email: George.G.Nasif@usace.army.mil

The Contracting Officer’s Representative (COR) for this project is:

Name: Jeremy Allen Phone: (907) 753-2753 Email: jeremy.m.allen@usace.army.mil

Proposal Submission and Work Plan

The proposal submitted by the Contractor must list in calendar days the time required after the notice to proceed to complete all tasks. The proposal must include a proposed work schedule and line items for all equipment and personnel mobilization, field work, testing, analysis, and report preparation for the work described in this scope.

Submit to the Owner an electronic copy of the proposed work plan at the time of proposal submission. The work plan will include the proposed work schedule, personnel qualifications, operational procedures, and equipment to be used.

A list of all subcontractor personnel who will perform work for this scope of work and their experience are to also be included in the submission.

Suggested Modifications

Any suggestions by the Contractor to modify this SOW, such as addition or deletion step drawn-down pump test, substitution or supplementation to the procedures and testing items, alternate test or inspection methods, adjustments to the schedule, or other changes believed to be appropriate for a better definition of site conditions in accordance with the SOW objectives are encouraged to be submitted by the Contractor. Any SOW modifications must be approved by the KO before proceeding with the modifications.

Permits

The Contractor must comply with all Federal, State and local law, regulations, and ordinances relating to the performance of this work. The Contractor must procure all required permits, utility locates, and dig permit clearances, certifications and licenses required by Federal, State, and local law for the execution of this work. A water use permit from the State of Alaska Department of Environmental Conservation (ADEC) will be required by the Contractor prior to conducting pumping tests.

Schedule

All field work for the Relief Well Maintenance Pumping Report must be completed – which must include data from all relief wells – as detailed in Table 1-1. Please be aware of specific restrictions:

no field work will be allowed during any federally recognized holiday weekend, and work is prohibited between 9:00 PM and 7:00 AM in the project area south of Lake Park Road and between River Park Road and the Moose Creek Dam control works. However, there are no time restrictions for field work between Lake Park Road and River Park Road, or north of the Moose Creek Dam control works.

The contractor is required to coordinate their work with other contractors already on site, and access to all wells may not be available simultaneously due to ongoing work by others. Your proposal must include a detailed schedule, in calendar days, outlining the time required to complete each task after receiving the Notice to Proceed, ensuring timely submission of the Draft/Final Relief Well Maintenance Pumping and Project Files Report.

Table 1-1. Task Required Submission Dates

Task Required Submission Date Work Plan and APP 10 April 2026

Completion of field work 30 September 2026 Draft Relief Well Maintenance Pumping Report

16 October 2026

Draft Project Files Report 16 October 2026 Final Relief Well Maintenance Report

20 November 2026

Final Project Files Report 20 November 2026

Requirements and Qualifications

Additionally, it is essential for Contractor personnel to meet the eligibility requirements necessary to gain access to a military installation. This ensures that the project can be carried out without hindrances related to access and security protocols.

Examination of Site

The Contractor should become familiar with the nature and conditions of the site, the type of equipment and facilities needed, and all matters which may in any way affect the work to be performed under this contract. Failure to take this precaution will not relieve the Contractor from furnishing all material and labor necessary to complete the contract without additional compensation.

Protection of Property

The Contractor must investigate and verify the location of existing utility lines before the start of field work and must protect such lines and adjacent properties during the course of work. At the completion of the work, the Contractor must restore the site to a similar condition existing before start of the work, including repairing ruts or erosion, unless otherwise directed. During the field activities if any previously unidentified or unanticipated historical, archaeological, and/or cultural resources are discovered, all activities in the vicinity of the find must be temporarily suspended until advised by the Contracting Officer to resume field activities.

Site Access and Equipment staging

The Contractor must coordinate access with USACE and the Chena River Lakes Flood Control Project Office Personnel. A set of project keys will be provided to the Contractor and will need to be turned in at the end of field work. The Contractor must check in with the Project office daily to inform project staff of areas they are working and projected area of work. Project contact personnel:

Jessica Prince, Chena Project Manager, (907) 488-5408

The Contractor will be permitted to park an equipment trailer and support equipment in the vicinity of the area of work. Security/Protection of the equipment will be the responsibility of the Contractor. However, the Contractor must be ready to sanitize and evacuate the area on short notice at the request of USACE project personnel. The Contractor will be responsible for determining safe access to relief wells required to be tested. The Contractor is responsible to adhere to all COVID-19 restrictions implemented on site.

The Contractor must coordinate work with other USACE contractors on-site and not inhibit construction activities with other ongoing contracts.

Equipment

The Contractor must use a submersible pump, motor, VFD (Variable Frequency Drive), associated pipe, and pump assembly accessories to meet the following specifications for the use of this contract work. A Wilo SPI 10.1200-1S.300 with a 3-phase 460 volt 30 hp motor is the preferred pump, a ‘similar’ pump may be substituted with prior approval from the COR. To be considered ‘similar,’ the pump must meet the following criteria:

Type: Submersible pump designed for well testing applications.

Voltage & Phase: 3-phase, 460-volt electrical supply.

Minimum Flow Rate: Capable of consistently delivering a minimum flow rate of 350 GPM at a head equivalent to the anticipated drawdown in the wells (as indicated in GFI- 4). The Contractor must provide a pump curve demonstrating this capability.

Diameter: A maximum outer diameter of 10 inches to ensure compatibility with the well casings.

Fitted with Flow Meter(s) and a Sand Tester.

The Contractor must provide the pump’s manufacturer’s specifications and pump curve to the COR for review and approval prior to use. Utilizing a similar pump to the one owned by the government will help in future maintenance to maintain consistency throughout tests.

The bulk of the relief wells with an initial step flow rate “Q” greater than 300 gpm must be performed with a similar submersible pump. However, some of the relief wells have a relatively low capacity and would be difficult to achieve pumping rates through all steps. For these lower capacity relief wells, it may be necessary to perform the Step-drawdown pumping test with an above ground pump. The development within this contract may allow these wells to perform at higher capacities.

A water level data logger and water level tape will be necessary to track and monitor water levels during pumping tests. The water level in all wells is typically four to 15 feet below the ground surface (BGS). An electronic flow meter is required to measure the flow rate. A flat-bottom sounding device and a measuring tape are required to determine the amount of sand infiltration deposited in the bottom of the well. A Rossum Sand Tester must be used to determine the amount of sand in the effluent. Pressure transducers and a data logger suitable for determining the depth to the top of the water must be used to find the exact drawdown in the well.

Figure 1. Typical pumping test equipment

Stand Down for Drilling Services

There may be occurrences of inclement weather or flood control operations at the project site when field operations cannot be performed due to concerns for quality data acquisition and general safety at the project site. Stand-down due to flood control operations will require prior approval from the COR before ceasing work. Stand down may be exercised at any time during field work. The Contractor will inform and receive approval from the Contracting Officer’s Representative (COR) prior to implementing stand-down time.

Availability of Materials

All field notes, sketches, data files, recordings, and computations made by the Contractor in completing this work must be available at all times during the progress of the work for examination by the COR, or his authorized representative. All such material will become the property of the Government upon completion of the delivery order.

Progress Conference Calls

The Contractor must organize, facilitate, and document scheduled conference calls with the Government to discuss the progress of work. At a minimum the Contractor must perform one (1) conference call prior to commencing field work, conference calls every weeks during field work, and one (1) conference call at completion of the field work. The scheduled times and dates will be mutually agreed upon by the Contractor and Government.

SCOPE OF WORK

Work required under this contract shall consist of furnishing all professional services, labor, materials, apparatus, supplies, transportation, equipment, required insurance, permits, and any other items, accessories, and services necessary to complete the work specified herein. All work shall be performed in strict accordance with this work and any modifications, and applicable drawings, local regulations, and building codes. The deliverable shall consist of the deliverables listed in Section 1.1 using the results of the geotechnical investigation.

CLIN 1: Work Plan and Accident Prevention Plan

Following the receipt of the Notice to Proceed (NTP) and prior to commencing work, the Contractor must prepare and submit to the Government a Draft Work Plan. The Draft Work Plan must describe in detail the Contractor’s schedule for completing the work, personnel qualifications, operational procedures, and equipment to be used. The Draft Work Plan must include the Quality Control Plan (QCP), Testing, Maintenance, and Monitoring Plan, and an Accident Prevention Plan per EM 385-1-1. The required Draft Work Plan must be submitted to the Government as required by Table 1-1 before field work. The Government will review and provide comments on the Draft Work Plan. Once comments are incorporated, the Final Work Plan will be accepted by the Government. The Final Work Plan must be approved by the Government prior to the start of work. Any deviations from the Final Work Plan during execution of the work must be noted in the daily logs and reports, with direct notification given to the COR at the time the deviation occurs.

Work Plan

The Work Plan must be made available to the Government for comments and approval no later than the date listed in Table 1-1. The Government will review and provide comments to the Contractor within 10 calendar days upon receipt of the Plan. The Contractor will have 10 calendar days to address the comments and finalize the Plan.

Quality Control Plan

The Contractor must submit a Quality Control Plan (QCP) with the Work Plan, detailing the system to be used to manage, control, and document the performance of tasks under this SOW. The quality control activities must be documented and included in the final reports, to include evidence of the Contractor’s internal review process and approvals completed in preparing the draft and final reports. The Contractor must ensure that the corporate quality policy is understood, implemented, and maintained at all levels in the organization. The Contractor must perform continuous tracking, checks, evaluations, and adjustments to field and testing operations for quality control and to establish efficient work procedures. The Contractor is responsible for ensuring that project work proceeds smoothly in accordance with the SOW, Work Plan, and providing summaries of quality control activities to the Government during progress calls.

Accident Prevention Plan

Prior to starting work, the Contractor shall submit a site-specific Accident Prevention Plan (APP) to the government. The APP must be prepared in accordance with Engineering Manual EM 385- 1-1 “Safety and Occupational Health Requirements”, dated 15 Mar 2024. The Government will review and provide comments on the draft Accident Prevention Plan. No onsite fieldwork shall be performed until the APP has been approved by the Government. All work must comply with the requirements of EM 385-1-1. As a reference, an electronic copy of EM 385-1-1 can be downloaded from the following website:

https://www.publications.usace.army.mil/USACE-Publications/Engineer-Manuals/

CLIN 2: Mobilization and Demobilization

Prior to mobilization, a pre-trip meeting will be held to discuss the Work Plan, Accident Prevention Plan, and other services required under the SOW. No separate payment will be made for moves between boreholes. Mobilization and demobilization will consist of delivery of all equipment, materials, supplies, and personnel required for the work at the project site. Mobilization and demobilization will also consist of returning the surface to its original condition and site cleanup.

CLIN 3: Documentation and Initial Drawn Down Pump Test

All pumping tests must conform to Engineer Manual 1110-2-1914, Design, Construction, and Maintenance of Relief Wells and ASTM D 4043-17, Standard Guide for Selection of Aquifer Test Method in Determining Hydraulic Properties by Well Techniques.

Document Initial Conditions

This task involves noting the condition of the visible portion of the relief well above the surface, the immediate area approximately five-foot around the well for vegetation, trash, debris, ground subsidence and initial invert depth of the relief well. Initial conditions are provided in GFI-5 to the Contractor. Conditions noted in GFI-5 are from June 2024. At a minimum the following items to be noted are:

Visible damage or vandalism.

Painted relief well station identification.

Subsidence around relief well due to loss of material or erosion while conducting test.

Final sounding depth (after removing sediment).

Initial water level relative to the ground surface which will be documented in NAVD88 and feet below the ground surface.

Name, location, and initial water level of the closest piezometer or relief well

Depth of Sediment Accumulation: Measure and record the depth of sediment accumulation within the well using a weighted tape measure or sounding line.

The collected information from this task must be documented on individual Relief Well Summary Sheets. All collected data will be compiled in the Relief Well Maintenance Pumping Report.

Perform Step-drawdown

Following the initial inspection and data collection, work to be performed on all relief wells are as follows:

Perform Step-drawdown test to determine well’s efficiency(s) at the given pumping rates provide in GFI-4. Pumping rate is increased at approximately 25 percent every 60 minutes to create a “step” for a total of 4 steps.

Report pump performance results to the Government for review.

Pumps that perform at a pumping efficiency at or above 80% do not need to be cleaned. Pumps that do not perform at a minimum efficiency of 80% will be brushed and surged, as detailed in Section 2.3.3. and 2.4.2. Refer to GFI-4 for specific pumping rates for each well.

All discharge water from pump testing requires a water discharge permit from the State of Alaska Department of Natural Resources that the contractor will obtain. The discharge from the pump testing must be released as to allow the discharged water to flow into the seepage collector channel at the lowest possible energy. Discharged water for the relief wells between Laurance Road and the dam embankment must be diverted to the nearest culvert to allow the water to flow to the seepage collector channel. Measures must be taken as necessary to prevent erosion of any material along the entire flow path of the discharged water until it reaches the seepage collector channel. Care must be taken to prevent any erosion to seepage collector channel side slopes.

The aquifer's response, or drawdown, is measured to determine well efficiency and the effective pumping rate for a constant-rate pumping test. A well is pumped at a constant rate for a given period of time. The pumping rate is successively increased or stepped for each of the four (4) time intervals. The water level must be electronically measured during each step (interval), and drawdown is calculated for each pumping rate. Utilize the four pumping rates provided in GFI-4 to perform the test. Follow Guidance from Engineering Manual 1110-2-1914 and ASTM D4043- 17, Standard Guide for Selection of Aquifer Test Method in Determining Hydraulic Properties by Well Techniques.

If excessive sand infiltration occurs while performing each step-drawdown pumping test as per USACE EM 1110-2-1914, “Design, Construction on, and Maintenance of Relief Wells”, stop the test and notify the USACE COR and the KO. The collected information from of this task must be documented on individual Relief Well Summary Sheets. All collected data will be compiled in the Relief Well Maintenance Pumping Report.

Pumping equipment must be similar to a nominal 10-inch diameter submersible pump manufactured by National Pump Company (model SH10MC-1). A gate valve should be used to vary the pumping rates, and a flow meter with a gauge and totalizer used to establish and monitor pumping rates during the step-drawdown test. Pumps should be set roughly 30 feet below the top of casing on a steel pipe column with a 90-degree elbow at the top to connect to the surface discharge system. Pumping rates provided in GFI-4 have a range of ± 10 gpm that can be within the pumping rate.

2.3.2.1. Sand Testing

During step-drawdown testing, sanding rates will be measured in the discharge water using a Rossum Sand Tester manufactured by Roscoe Moss Company or equivalent. The sand tester should be located after the 90-degree bend in the discharge system where flow was estimated to be turbulent. Prior to the test, the inlet valve should be opened and calibrated to ensure a target flow of 0.5 gpm. After calibration the inlet valve can be closed and the glass tube cleaned and replaced. Measure sand collected in the glass tube in milliliters (ml) per minute and then convert to parts per million (ppm). A measurement must be taken during each step-drawdown test (4 times). If sand content in the discharge water exceeds 50 ppm (or 5 ml/min as measured by the Rossum Sand Tester), the step-drawdown test must be stopped immediately, and the USACE COR or KO notified.

2.3.2.2. Typical Equipment to be Used During Step-drawdown Testing

It is suggested that support vehicles, pump hoist truck, boom truck, and tracked drill rig should be used to hoist the pump and lower and lift equipment in and out of the relief wells. It is the Contractor’s responsibility to supply equipment in order to complete the task.

Daily Reports

The Contractor must keep continuous logs of all operations, observations, and measurements.

These logs will be made available to the Owner on a day-to-day basis to assist in planning subsequent work and other exploration activities no later than noon the following workday. These detailed logs must contain at least the items listed below. Daily logs must include but are not limited to:

Names and affiliations of personnel engaged in the work.

Weather conditions.

All events affecting data acquisition or quality.

Equipment used.

Equipment adjustments, malfunctions, and downtime with explanations.

System calibration details.

Details of check observations and computations.

Dates and times of mobilization and demobilization.

A copy or description of all preliminary data.

All written and verbal instructions issued by the Owner and a description of the resolution of any issues.

All other relevant information and occurrences, including a general narrative of the total activity.

Any deviations from the Work Plan, with direct notification to the COR.

CLIN 4: Cleaning and Maintenance

Cleaning and maintenance activities will be performed according to the sediment thresholds outlined in Section 2.4.4. Wells deemed below the efficiency threshold should be cleaned and have maintenance performed in accordance with the following sections.

Brushing

Brushing of the interior of the well, from the riser through the screened section is often employed as a ‘pre’ treatment to mechanical rehabilitation. The required brushing consists of attaching an appropriately designed stiff poly or nylon brush to drill pipe or an approved apparatus and brushing the interior of the well. It is required that brushing be accomplished in small sections, to ensure thorough cleaning of the interior of the well.

Air Surging

Air surging consists of alternating cycles of air surging and airlift pumping using suitably sized airline and air compressor. Prior to the start of the surging action, well flow should be initiated by injecting compressed air, above the screen, at a reduced rate, until uninhibited flow through the well screen is achieved. This will reduce the potential for screen collapse during initial surging.

Once uninhibited flow through the well screen is achieved, the surging action can be initiated by cycling between air surging and airlift pumping. The cyclic surging and pumping must be performed at five-foot intervals throughout the length of the screen, for a period of 5 minutes, per interval. Two full cycles are required to penetrate maximum energy into filter pack. Repeat the full cycle until the water discharge is clear.

Remove Sediment

Sediment may exist or be generated during well maintenance. The sediment may consist of organics, fines, sand, and/or gravel. All sediment must be removed from all intact serviceable relief wells before the step-drawdown tests. An air lift system is recommended for this process.

Sediment Thresholds & Action Plan

Based on the depth of sediment accumulation measured during the initial inspection (Section 2.3.1), the following actions shall be taken:

Threshold 1: Sediment Depth of 12 inches or greater: If the sediment depth is 12 inches or greater, the well shall be cleaned using the brushing and surging procedures outlined in Sections 2.4.1 and 2.4.2, regardless of whether the well’s initial pumping efficiency is above or below 80%.

Threshold 2: Sediment Depth of 36 inches or greater: If the sediment depth is 36 inches or greater, no cleaning or maintenance shall be performed. The Contractor shall immediately notify the USACE COR and KO, and await further instructions. This sediment level may be indicative of potential well failure and may necessitate well replacement.

Continued pumping may exacerbate the damage.

The rationale for these thresholds is to allow for a reasonable amount of sediment without compromising well function, while preventing further damage to wells with excessive sediment accumulation.

CLIN 5: Re-Test Relief Well Efficiency

Following the brushing and surging of all wells operating under 80% efficiency as calculated by the equations in GFI 4, perform a step-drawdown test on all cleaned wells to determine their efficiency after cleaning. Report new pump performance results to the Government for review.

CLIN 6: Reporting

All reports must be completed in English using Arial Font and imperial units. Data should be presented in tables to the maximum extent practicable.

Draft Relief Well Maintenance Pumping Report

The Contractor must submit one Draft Relief Well Maintenance Pumping Report at the end of the work being performed. See Section 1.10 for schedule of deliverables and Section 2.4 for work performed to be included. The report should include all the completed information shown in GFI 4 template provided as well as the information contained from GFI 7 for each well. The draft report can be submitted with one electronic copy by email or FTP in Adobe Portable Document Format (pdf) to the Government. All reports must be completed in English using imperial units. The Government will review and provide comments to the Contractor within 14 calendar days upon receipt of the report. The Contractor will have 14 calendar days to address the comments and finalize the report.

Final Relief Well Maintenance Pumping Report

The Contractor must submit one hard copy of the Final Relief Well Maintenance Pumping Report and one electronic copy through email or FTP in Adobe Portable Document Format (pdf) to the Government.

Draft Project Files Report

All data generated from this contract must be compiled in a separate project file report. Contractor must submit one electronic copy by email or FTP of the draft project files report to the Government. The file report must contain but not limited to the contract work, approved work plan, quality control plan, field testing notes, relief well photographs, site working photographs, all project data files in original file format, and Dr. Checks Comments.

Final Project Files Report

All data generated from this contract must be compiled in a separate project file report. Contractor must submit one electronic copy through email or FTP of the project files report to the Government. The file report must contain but not limited to the contract work, approved work plan, quality control plan, field testing notes, relief well photographs, site working photographs, all project data files in original file format, and Dr. Checks Comments.

Review of Draft Work Plan, Draft Relief Well Maintenance Pumping Report, and Draft Project Files Report

All review comments will be submitted by the Government using document review software called DrChecks. The Contractor will obtain access and training on DrChecks prior to submitting draft deliverables. DrChecks is intended to allow for centralized tracking of comments, responses, and resolution of issues.

Contractor access to DrChecks is to be coordinated with the COR. Before the review conference is held the Contractor must respond to all comments in DrChecks. One teleconference review will be held to resolve any open comments regarding the Draft Work Plan, Draft Relief Well Maintenance Pumping Report, and Draft Project Files Report. The review conference will be facilitated by the Contractor and will not exceed two hours. The scheduled time and date will be mutually agreed upon by the Contractor and Government. The Contractor shall provide individuals with the appropriate background and experience to participate in the review teleconference.

UNIT PRICE PAYMENT ITEMS

CLIN 01 - Work Plan and Accident Prevention Plan

Payment will be made for the labor and cost associated with producing the Work Plan for the project. The Contractor’s proposal is to include a detailed breakdown of all the cost associated with producing the work plan in accordance with Section 2.1. The unit of measure is per contract and determined by the COR.

CLIN 02 - Mobilization and Demobilization of Equipment, Supplies, and Personnel

Payment will be made for the labor and cost associated with mobilizing and demobilizing all equipment, supplies, and personnel to the project site for the project. The Contractor’s proposal is to include a detailed breakdown of all the cost associated with mobilization and demobilization in accordance with Section 2.2. The unit of measure is per contract and determined by the COR.

CLIN 03 – Documentation and Initial Pumping Test

Payment will be made for labor and costs associated documentation and initial pumping test in accordance with Section 2.3. The Contractor’s proposal is to include a detailed breakdown of all the cost associated with producing the documentation and initial pumping test. The unit of measure is per contract and determined by the COR.

CLIN 04 - Cleaning and Maintenance of Wells

Payment will be made for labor and costs associated with cleaning and maintenance of 70 wells in accordance with Section 2.4 due to sediment accumulation exceeding the thresholds defined in Section 2.4.5. The Contractor’s proposal is to include a detailed breakdown of all the cost associated with producing the cleaning and maintenance of wells. The wells requiring cleaning will be determined based on the initial inspection findings (Section 2.3.1). The unit of measure is per contract and determined by the COR.

CLIN 05 - Re-Test Relief Wells Efficiency

Payment will be made for labor and costs associated with re-testing 70 relief wells efficiency in accordance with Section 2.5. The Contractor’s proposal is to include a detailed breakdown of all the cost associated with producing the re-test relief wells efficiency. The wells requiring cleaning will be determined based on the initial inspection findings (Section 2.3.1). The unit of measure is per contract and determined by the COR. Actual quantity of relief wells to be re-tested will vary.

CLIN 06 - Reporting

Payment will be made for the labor and costs associated with reporting requirements for the project in accordance with Section 2.6. The Contractor’s proposal is to include a detailed breakdown of all the costs associated with the reporting milestones and associated project file reports. The unit of measure is per contract and determined by the COR.

GFI-1

Project Location and Vicinity Map .................................................................................. 1 page

ALASKA DISTRICT

MOOSE CREEK DAM, NORTH POLE, AK

SCALE: NTS

DRAWN: AJR

CORPS OF ENGINEERS

Geotechnical and Materials

CHENA RIVER LAKES FLOOD CONTROL PROJECT VICINITY MAP

REVIEWED: JJR

GFI-1

DATE: 11/18/2021

U S

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2.1

2.2

2.3 2.4

2.5

2.6 2.7

2.9

2.10

2.11 2.12

2.13 2.14 2.15

2.16 2.17

2.18 2.19

2.20 2.21

2.22

2.8

GFI-2

Proposed Test Borehole Location Map ...................................................................... 24 pages

478+

475+

-517

-516

473+

-515

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Geotechnical and Materials

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2.1

RELIEF WELL AND PIEZOMETER LOCATION

SCALE:1" = 250'

DRAWN: AJR

REVIEWED:

DATE: 11/24/2021

446+

445+

445+

444+

443+

-512

441+

-390

-389

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2.2

SCALE:1" = 250'

DRAWN: AJR

-389

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K A

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436+

436+

435+

435+

434+

-511

R E

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P -388

R E

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N

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2.3

IE

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O M

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-386

SCALE:1" = 250'

DRAWN: AJR

418+

-510

-383

-382

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2.4

SCALE:1" = 250'

DRAWN: AJR

-491

378+

377+

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376+

375+

-505

375+

-367

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2.5

SCALE:1" = 250'

DRAWN: AJR

P-505

375+62

375+00

P-367

US ARMY CORPS

OF ENGINEERS

P-366

374+37

373+87

P-482 373+37

372+37

P-481 371+80

371+25

P-490

370+70

370+15

369+60

396+00

368+50

368+25

RELIEF WELL

PIEZOMETER

REFERENCE

NUMBER

2.6

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2.7

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396+00

368+50

368+25

368+00

367+49

367+00

366+50

366+00

365+51

365+00

364+49

364+00

361+51

P-452

2.8

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P-452

361+35

360+94

360+52

P-451 360+10

359+69

P-450 P-454

359+27

358+85 P-455

358+44

P-449

358+02

357+60

357+20

356+81

356+42

356+08

355+64

P-448

355+25

2.9

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P-448

P-453

354+50

354+05 P-456

P-447

353+51

353+00

P-285

352+50

P-284

P-283

P-282

P-281

P-280

P-375 P-411 P-361-W

P-361-E

334+

333+

332+

-441

331+

-440

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2.10

SCALE:1" = 250'

DRAWN: AJR

339+

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-520

337+

-519

-518

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2.11

SCALE:1" = 250'

DRAWN: AJR

P-440

2.12

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330+35

P-436

P-437 P-357

P-445

P-442 P-443 P-356 329+34

P-444

P-438

328+35

P-439

327+35

326+40

325+45

324+70

P-424

2.13

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P-424

324+25

323+95

323+75

P-422

323+25

322+98

322+75

P-417

322+25

322+04

P-416

321+72 P-503

P-415 P-502

321+29

320+84

320+25

319+65

319+25

318+85

318+40

2.14

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318+05

317+65

317+25

316+85

316+45

316+03

315+65

P-501

315+25

314+75 P-477

P-478

314+30

313+75

313+25

312+75

2.15

S C

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A L

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312+25

311+75

311+25

310+75

310+25

309+75

P-350

310+00 309+25

309+00

308+00

P-457

P-480

P-351 P-458

-457

P -480

P -351

-458

306+

305+

304+

302+

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2.16

SCALE:1" = 250'

DRAWN: AJR

2.17

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301+60 P-476

301+25

300+90

300+58

300+20

P-500

299+85

P-475

299+50 P-474

299+15

299+00

298+00

297+00

296+25

295+50

295+

-473

294+

-472

294+

293+

292+

291+

291+

-459 290+

-460

-344

289+

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2.18

SCALE:1" = 250'

DRAWN: AJR

-460

-344

289+

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288+

287+

286+

285+

285+

-471

-470 284+

283+

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2.19

SCALE:1" = 250'

DRAWN: AJR

2.20

S C

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283+50

282+75

282+00

281+00

280+00

279+30

P-430 P-433

278+80 P-432 P-427 279+00

P-429

278+30 P-428

277+80 P-434

P-435 P-426 P-431

P-446 277+30

P-425

276+80

2.21

S C

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277+80 P-434 P-435

P-426 P-431 P-446

P-425

276+30

275+80

275+30

274+80

274+30

273+80

273+30

272+80

272+30

271+80

271+30

270+80

270+30

271+

270+

270+

-499

-339

-338

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2.22

SCALE:1" = 250'

DRAWN: AJR

-493

171+

-309

-308

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2.23

SCALE:1" = 250'

DRAWN: AJR

148+

147+

147+

-301 P

-302

-303

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2.24

SCALE:1" = 250'

DRAWN: AJR

GFI-3

Typical Relief Well Diagram ............................................................................................ 1 page

NFS GRAVEL

WITH SAND

TOC

IL

MATERIALS

1. THE STAINLESS STEEL 12" DIAMETER WELL SCREENS

ARE 45' IN LENGTH. THE SCREENS ARE 25 SLOT (0.025"

OPENING) WITH A KEYSTONE WIRE-WRAPPED CONTINUOUS

SLOT STRAINER.

2. RISER PIPE ARE ASTM - A252 SEAMLESS STEEL PIPE PILING,

12" DIAMETER SCHEDULE 40.

3. RISER PIPE TO WELL SCREEN ARE WELD

4. CENTRALIZERS: FOSTCO STAINLES STEEL - HEAVY DUTY

12". ATTACHED TO SCREEN WITH FOSTCO SUPPLIED

TYPE 304 STAINLESS STEEL WORM DRIVE BAND CLAMP.

5. BOTTOM CAP: 3/8" STAINLESS STEEL PLATE.

6. FILTER PACK GRAVEL PACK IS PEA GRAVEL

7. BENTONITE: CETCO COARSE BENTONITE CHIPS.

BENTONITE STEEL RISER

WATER SURFACE

PEA GRAVEL

FILTER PACK

TOC OR IL

STAINLESS STEEL

SCREEN

WATER SURFACE

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GFI-4

Relief Well Pumping Data .............................................................................................. 4 pages

GFI-4 Moose Creek Dam Relief Well Pump Contract - 2025 Wells to pump (140 Wells) Data Sheets

Pumping Test

Relief Well (RW)

Name and Station

Static Water Level

BGS (ft)

Target Pump Rate

(GPM)

Actual Pump Rate

Q (GPM)

Steady State

Water Level Draw Down DD (ft)

Specific Capacity

SC=Q/DD (GPM/ft)

2017 Specific

Capacity SC2017 (GPM/ft)

Specific Capacity Ratio SCR (SC/SC2017) value low than 0.80, perform

Item 4 then re-test

147+40 1020 680

147+70 1040 416

148+00 950 328

171+00 1000 435

270+80 140 35

271+30 300 150

271+80 270 135

272+30 370 132

272+80 90 23

273+30 290 100

273+80 630 300

274+30 320 178

274+80 450 141

275+30 480 155

275+80 190 50

276+80 1030 412

278+30 1100 367

278+80 1170 377

279+00 920 418

279+30 1120 509

280+00 850 425

281+00 970 441

282+00 180 100

282+75 310 124

283+50 370 218

284+25 510 319

285+00 240 126

285+75 60 60

286+50 190 146

287+25 190 83

288+00 45 16

288+75 100 38

289+50 190 100

290+25 110 100

SCR below 0.80 indicates a low performance well. Initiate Cleaning and maintenance then re-test relief well.

Pumping Re-Test

Ratio SCR

(SC/SC2017)

(GPM/ft)

Specific Capacity Ratio SCR (SC/SC2017) value low than 0.80, perform

Item 4 then re-test

291+00 40 27

291+75 240 46

292+50 120 100

293+50 200 125

294+00 220 85

294+75 90 30

295+50 220 73

296+25 210 124

297+00 100 25

298+00 120 46

299+00 170 121

299+15 70 64

299+50 580 290

299+85 650 325

300+20 700 350

300+58 570 407

300+90 660 330

301+25 740 411

301+60 760 422

301+90 720 450

302+30 820 456

304+00 680 378

305+00 580 483

306+50 460 164

308+00 650 382

309+00 670 305

309+25 110 79

309+75 110 69

310+25 120 67

310+75 80 53

311+25 90 56

311+75 70 70

312+25 230 115

312+75 1120 589

313+25 770 481

313+75 810 540

314+30 510 283

(GPM/ft)

Specific Capacity Ratio SCR (SC/SC2017) value low than 0.80, perform

Item 4 then re-test

314+75 470 294

315+25 650 433

315+65 750 395

316+03 750 357

316+45 750 375

316+85 750 536

317+25 750 441

317+65 1100 647

318+05 1180 656

318+40 1130 706

318+85 750 625

319+25 950 559

319+65 680 680

320+25 1000 556

320+84 1130 628

321+29 1130 595

322+04 980 490

323+95 760 507

324+70 970 693

325+45 880 677

326+40 770 367

327+35 780 355

328+35 950 679

329+34 800 500

330+35 690 431

331+34 500 294

332+35 550 344

333+25 670 479

334+15 920 511

338+79 140 44

339+19 490 132

352+50 410 71

353+00 42 14

353+51 80 25

354+05 250 78

354+50 270 135

355+06 430 154

(GPM/ft)

Specific Capacity Ratio SCR (SC/SC2017) value low than 0.80, perform

Item 4 then re-test

355+25 670 353

358+02 650 325

361+35 1320 943

363+51 480 104

364+00 390 100

364+49 420 156

369+60 950 396

370+15 1140 475

371+25 1100 1000

371+80 1120 800

372+37 1100 786

372+87 1120 862

373+37 720 327

373+87 1120 589

375+62 1170 975

376+22 1330 831

376+82 1030 792

378+07 1350 519

418+00 1370 623

434+50 1080 675

435+00 980 980

435+50 1330 782

436+00 1100 1000

436+50 1200 857

443+90 290 181

444+70 750 395

445+30 240 160

445+80 240 150

446+20 250 227

473+00 320 200

475+00 310 221

478+00 350 206

SCR below 0.80 indicates a low performance well. Initiate

GFI-5

Relief Well Inventory ..................................................................................................... 7 pages

RW Station

Original

Well Depth (ft, BGS)

Well Description

Date

2024 Cap to Water

(ft)

2024 Cap to Bottom Well

Depth

2024 Stickup (ft)

2024 Cement to

Ground (ft) / Invert to top (ft)

2024 Total Well

Stickup (ft)

Depth (ft, BGS)

Snow Flag

(Yes/No/Bent)

2024 Notes

147+40 118 Locked corrugated steel protective top, 12" steel wellhead 6/18/2024 4.36 121.53 0.41 0.00 0.41 121.12 Yes Flag installed

147+70

Locked corrugated steel protective

6/18/2024

4.46

124.40

0.42

0.79

1.21

123.19

No

148+00

0.00

Permanent pump installed, cannot measure

171+00

7.22

120.75

0.29

0.12

0.41

120.34

Yes

270+30

120.6

Bolted 12" steel wellhead

10.87

75.78

1.59

1.79

74.19

Needs long bolt

270+80

28.2

11.83

28.50

3.17

1.35

3.17

25.33

271+30

27.9

13.06

28.08

3.91

1.37

3.91

24.17

271+80

27.8

12.97

27.55

4.03

1.36

4.03

23.52

Slots above ground - relief well not functional

272+30

26.7

13.05

26.10

4.20

1.34

4.20

21.90

272+80

27.9

11.99

26.93

3.41

1.38

23.52

273+30

28.3

11.85

27.54

3.33

24.21

273+80

12.12

26.37

3.66

3.66

22.71

274+30

28.5

12.60

26.81

4.01

4.01

22.80

274+80

49.8

10.88

52.27

2.82

2.82

49.45

275+30

11.60

48.49

3.48

3.48

45.01

275+80

35.4

10.32

33.11

31.00

276+30

124.8

Bolted 12" steel wellhead with sleeved break

11.11

119.95

3.25

1.72

3.25

116.70

125.6

8.86

127.40

125.61

124.5

10.68

124.11

120.70

277+80

125.2

10.83

123.65

3.51

1.62

3.51

120.14

Bottom of invert cracked, water will not come out spout

278+30

125.4

9.11

128.01

1.88

1.88

126.13

278+80

125.7

8.50

128.52

2.28

126.24

Well in depression, stickup taken directly below top of wellhead lip

279+00

11.96

55.14

0.30

54.84

Bent

279+30

124.7

9.70

126.00

2.43

2.43

123.57

280+00

11.87

55.13

0.33

0.04

0.37

54.76

281+00

11.68

55.18

54.85

282+00

29.5

11.49

29.76

0.35

29.41

282+75

11.30

29.73

0.32

0.07

0.39

29.34

283+50

11.41

29.84

0.40

29.44

284+25

11.04

29.83

29.44

285+00

11.13

29.89

29.56

285+75

11.06

29.24

0.31

28.93

286+50

11.02

29.59

287+25

10.96

29.56

Flag replaced

288+00

10.81

29.95

29.54

288+75

11.48

0.34

29.50

289+50

11.48

29.52

290+25

10.88

29.77

29.40

291+00

10.76

29.80

29.45

Flag replaced, lid bent - needs to be replaced

291+75

11.06

29.88

29.55

292+50

10.92

29.82

0.08

29.41

293+50

10.64

29.64

29.30

294+00

10.91

29.70

0.08

29.31

294+75

11.02

29.81

0.38

0.38

29.43

295+50

10.58

29.74

29.40

296+25

6/20/2024

10.72

30.54

0.36

0.16

0.52

30.02

Flag straightened

297+00

10.87

29.83

0.21

0.53

29.30

298+00

10.94

32.77

32.44

299+00

11.07

32.91

32.58

299+15

28.7

10.80

29.87

2.56

27.31

299+50

110.3

11.10

112.84

2.70

110.14

299+85

126.2

10.52

128.11

1.86

1.86

126.25

New ground elevation

300+20

125.8

10.11

126.86

124.75

Missing bolt

300+58

10.49

127.70

1.91

125.79

300+90

10.48

127.87

125.63

301+25

123.8

10.27

127.07

1.76

1.76

125.31

301+60

10.66

127.03

2.94

2.94

124.09

Stickup measured from below lip in depression

301+90

116.7

11.32

118.54

2.58

115.96

302+30

10.70

127.51

2.68

2.68

124.83

304+00

11.18

55.23

54.83

305+00

11.54

54.96

54.64

306+50

12.04

55.08

308+00

11.75

55.14

54.77

309+00

11.55

55.23

54.89

309+25

27.3

11.83

32.36

3.86

3.86

28.50

Survey elevations used to calculate stickup from to measure invert to

309+75

11.86

32.53

3.79

3.79

28.74

Survey elevations used to calculate stickup from to measure invert to

310+25

27.8

10.19

30.46

1.94

1.94

28.52

310+75

9.66

27.60

1.48

26.12

311+25

27.7

10.06

28.51

2.07

2.07

26.44

311+75

28.1

7/23/2024

9.46

30.64

2.48

2.48

28.16

312+25

8.76

28.33

26.85

123.4

8.40

125.40

1.11

1.11

124.29

125.5

9.08

127.02

1.50

125.52

313+75

125.3

8.94

126.94

1.43

125.51

314+30

7.04

126.09

1.28

124.81

314+75

6.75

127.10

1.41

125.69

315+25

7.30

127.64

1.65

1.65

125.99

315+65

8.28

126.95

1.84

1.84

125.11

316+03

7.98

126.04

1.54

1.32

1.54

124.50

316+45

7.68

126.95

1.90

1.90

125.05

316+85

126.4

7.49

126.47

124.56

317+25

7.61

125.82

2.27

2.27

123.55

317+65

125.1

7.60

126.66

124.48

318+05

124.5

7.86

126.03

1.75

1.75

124.28

7.49

126.72

1.00

1.00

125.72

128.3

7.53

131.15

1.13

1.13

130.02

125.9

7.32

127.46

126.10

319+65

120.6

7.31

122.06

1.71

120.35

320+25

125.1

7/25/2024

6.34

126.65

1.22

125.43

320+84

6.45

125.60

1.45

124.15

321+29

123.7

7.17

126.30

124.68

Flag replaced, stickup measured from cement

321+72

Original 8" steel wellhead

6.60

85.25

1.29

1.27

1.29

83.96

322+04

6.50

126.65

1.44

1.31

125.21

322+25

6.00

84.06

82.70

322+75

6.98

83.92

1.73

1.26

82.19

322+98

124.1

7.42

124.27

1.52

121.57

Flag replaced, gap between well and invert - well not functional

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File details come from the government source that posted it. Updated .