TNF Well Testing SOW.pdf

STATEMENT OF WORK (SOW)

FOR

WELL TESTING SERVICES

ON

TINIAN NORTH FIELD

12 August 2025

1. PROJECT INFORMATION

1.1 Purpose: The 513th Expeditionary RED HORSE Squadron (513 ERHS) is conducting an adaptive rehabilitation of Tinian North Field. As part of this project, approximately 50k gallons of construction water will be required per day. Well testing is required to determine the suitability of existing wells in the Military Lease Area (MLA) for rehabilitation and potential use.

1.2 General Scope: The Contractor shall furnish all design, labor, equipment, material, transportation, administration, supervision and all else necessary to conduct well pump testing at Ushi well and an additional location in the MLA on Tinian. The location and conditions of Ushi well possible additional well can be found in Attachment 1: MLA Well Locations and Conditions.

The Contractor will perform well disinfection, pump testing, laboratory analysis, and reporting in accordance with the specifications described below. Specific objectives of the well testing include assessment of the (1) quantity and (2) quality of groundwater that may be safely developed from the site without causing significant degradation (particularly salination) to the groundwater resource of the Commonwealth of the Northern Mariana Islands (CNMI).

1.3 Permits: 513 ERHS has obtained a CNMI Bureau of Environmental Coastal Quality (BECQ) Well Exploratory Permit for well investigation in the MLA (Permit Number: WEX-24- 003). Any additional permits required as a part of this SOW shall be the Contractor’s responsibility.

1.4 Location: The project site is located on Tinian North Field within the MLA, approximately 9 miles north of San Jose Village. The site is open to the public. Exact well locations can be seen in Attachment 1: MLA Well Locations and Conditions. All locations of wells do not have power or water available on site. Sites of locations will be cleared by 513

ERHS.

1.5 Transportation: Contractor shall furnish all transportation on equipment, material, and all else required for the scope.

1.6 Applicable Codes: In addition to the permit requirements, the Contractor shall adhere to all applicable US and CNMI laws and regulations.

2. GENERAL REQUIREMENTS

2.1 Notification: The Contractor must notify the Government and BECQ at least one week prior to any assessment activities.

2.2 Well Disinfection: As required by the permit, the Contractor shall disinfect the well and discharge piping prior to the start of the pump test. Disinfection shall be accomplished by maintenance of a free chlorine residual of at least 100 parts per million (ppm) for a period of at least 24 hours. See the following table for guidance in determining the necessary chlorine does to achieve a chlorine concentration of 100 ppm in the well water. After the first application of chlorine into the well, the contractor shall momentarily operate the test pump in order to mix the chlorine solution in the well water and to introduce chlorine into the discharge piping. A chlorine solution shall be applied to the interior of the well casing above the water level.

Well Casing Diameter 65% HTH Dry

Weight (1) 5.25% Commercial Bleach Liquid Measure

6 inch 4.0 oz. 40 oz.

8 inch 6.0 oz. 64 oz. (1/2 gallon) 10 inch 8.0 oz. 112 oz.

12 inch 12.0 oz. 160 oz.

16 inch 22.0 oz. 256 oz. (2 gallons) 20 inch 34.0 oz. 428 oz.

NOTES:

(I) Where a dry chemical is used, it should be mixed with water to form a chlorine solution before putting it into the well.

(2) All other chemical additives applied in and around the well require approval by the Contracting Officer prior to use.

2.3 Pump Testing: The Contractor shall perform pump testing for wells listed in Attachment 1 in accordance with all applicable permits, laws, and regulations. Pump testing requirements are listed below:

2.3.1 Pre-Test Requirements

2.3.1.1 Well Driller License: The Contractor must have a CNMI Licensed Well Driller on site at all times during pump testing/aquifer yield testing.

2.3.1.2 No permanent pumping equipment shall be installed without obtaining a Well Operation Permit from BECQ.

2.3.1.3 Pump tests shall be scheduled with BECQ a minimum of two (2) weeks in advance.

Testing should occur during normal working hours whenever feasible.

2.3.1.4 For wells with a total discharge capacity exceeding 200 gallons per minute (gpm), the contractor shall provide a qualified hydrogeologist or groundwater engineer to supervise the testing process and provide a formal report in accordance with applicable regulations.

2.3.1.5 At least 24 hours prior to the scheduled pump test, the Contractor’s licensed well driller shall inspect and verify proper operation of the pump, generator, discharge piping, valves, meters, and gauges.

2.3.2 Sustainable Yield Aquifer Testing

2.3.2.1 The Contractor shall conduct a 36-hour sustained yield aquifer test at a constant discharge rate (40 gpm maximum). The test shall be continuous and include monitoring of water level, flow rate, and water quality in accordance with the schedule below. Water levels shall be measured to the nearest 0.01 feet using a calibrated electronic depth sounder, data logger, or steel tape with chalk.

2.3.2.2 Water Monitoring Schedule:

Duration Recording Interval 0 to 10 minutes Every minute 12 to 30 minutes Every 2 minutes 40 minutes to 1 hour Every 10 minutes 90 minutes to 8 hours Every 30 minutes 9 hours to 24 hours Every 1 hour 26 hours to 36 hours Every 2 hours

2.3.2.3 Flow Measurements: The Contractor shall measure flow rates through a mechanical flow meter and make recordings at least once every 30 minutes for the first 8 hours of the pump test, and every hour thereafter. Other methods of flow measurement must be given prior approval by the Contractor Officer.

2.3.2.4 Discharge Requirements: Discharge water from the pump test must be directed at a minimum of 100 feet downgradient from the well. Water shall not cause ponding, impact adjacent property, or create a nuisance.

2.3.2.5 The well site shall be kept clean and free of excessive mud and debris prior to pump testing.

2.3.3 Recovery Testing

2.3.3.1 Immediately following the pump test, the Contractor shall conduct an aquifer recovery test. Water levels will be recorded every 1 minute for the first 60 minutes, or until water level recovers to within 95% of the pre-pumping level (whichever occurs first).

2.3.3.2 If recovery takes longer than 60 minutes, measurements shall continue every 10 minutes until 95% recovery is reached.

2.3.4 Water Quality Testing

2.3.4.1 The Contractor shall conduct routine water quality sampling throughout the pump test at designated time intervals. All sample bottles shall be clean, sealed, and provided by the laboratory conducting the analysis. The Contractor shall sample for the following parameters:

• Chloride

• Total Hardness

• Nitrate

• pH

• Total Dissolved Solids (TDS)

• Conductivity

• Total Coliform

2.3.4.2 Chloride, hardness, pH, conductivity, and TDS shall be taken at hour 0 (start of pump test), and hours 2, 4, 6, 8, 12, 16, 24, 30, and 36. Clean, clear, 500 ml plastic bottles shall be used.

Bottles shall be labeled by project name, time and date of sampling, sample number, and the person responsible for taking the sample.

2.3.4.3 Nitrate and total coliform shall be taken at the end of the pump test, placed in specially prepared bottles given by the analyzing laboratory, and delivered to the lab in accordance with the lab's instructions. Bottles shall be labeled by project name, constituent to be analyzed, time and date of sampling, sample number, and person responsible for taking the sample.

2.3.4.4 Sampling for additional non-routine parameters (e.g., VOCs) may be required.

2.3.5 Laboratory Analysis

2.3.5.1 Upon completion of pump testing, the Contractor shall schedule with a certified laboratory to perform the Phase II/V Chemical and other water quality monitoring requirements.

These tests must be performed by an EPA-certified lab.

2.3.5.2 The Contractor shall utilize an EPA-certified laboratory to conduct the required testing on the water samples. The water samples may be analyzed by the BECQ Laboratory or another EPA-certified lab. If using the BECQ Laboratory, the Contractor must follow all applicable sampling and submission procedures. If using another certified lab, written notice must be provided to BECQ prior to pump testing.

2.3.6 Reporting: The Contractor shall prepare a comprehensive Testing and Analysis Report (TAR) for submission to BECQ and 513 ERHS. The report will detail findings from the exploration, summarize results, and provide recommendations on the way forward for well rehabilitation.

2.3.6.1 The Contractor shall submit the final TAR within 60 days following completion of the pump test.

2.3.6.2 The Contractor shall use the forms provided in the BECQ Well Operations Permit Application for submission of pump test and water quality data. The Contractor shall submit all water quality sampling results as specified in Section 9 of the Well Drilling and Well Operation Regulations.

2.3.6.3 The report shall be certified by a Registered Geologist or Professional Engineer, as appropriate. All test data, water levels, flow rates, and sampling results must be included in the final report.

2.3.6.4 The Contractor shall include actual well locations, finished depth, drill hole and casing diameter, well screen type and depth (if any), well casing elevation (MSL datum), static water surface elevation and maximum drawdown water surface elevation (MSL).

2.4 Additional Pump Testing

2.4.1 Should the well pump test and analytical data indicate that long-term degradation of groundwater quality may occur as a result of withdrawing water from the depth and rate as requested, the Contractor may be required to perform subsequent pump test(s) at reduced flow rate(s) to ensure no degradation of the groundwater will occur as a result of 513 ERHS’s withdrawal at the permitted maximum monthly well production allocation. The purpose of this provision is, in part, to minimize the possibility of saltwater intrusion which can occur due to over-pumping wells.

2.4.2 No more than four (4) additional pump tests will be required based on the results of the initial pump tests.

2.5 Schedule of Deliverables: The Contractor shall submit the following deliverables in accordance with the schedule outlined below. All deliverables must be submitted in digital (PDF) format unless otherwise specified.

ID Deliverable Description Due Date 01 Pump Test

Notification Written notice to BECQ requesting scheduling of pump test.

Minimum of 14 calendar days prior to test start

02 Pre-Test Equipment Checklist

Checklist confirming pump, generator, meters, and other equipment are tested and operational.

24 hours before scheduled pump test

03 Water Quality Sampling Plan

Outline of sampling method, timepoints, and lab details.

Prior to test commenceme nt

04 Daily Field Log Sheets

Records of field activities, water levels, flow rates, weather, and site observations.

Submitted daily during testing

05 Chain of Custody Forms

Documentation for all water samples delivered to lab(s).

With each sample delivery

06 Routine Water Quality Results

Laboratory results for routine parameters as outlined in Section 2.3.4.

Within 30 days of sample collection

07 Non-Routine Parameter Results (if any)

Laboratory analysis for VOCs or other parameters requested by BECQ.

Within 30 days of test completion

08 Testing and Analysis Report

(TAR)

Final comprehensive report summarizing all findings, results, and recommendations.

Within 60 days after pump test completion

09 Additional Pump Test Reports

If required, additional testing results and updated conclusions.

Within 14 days of each subsequent test

NOTE: All reports must follow the formats and submission requirements outlined in the BECQ Well Operations Permit Application and the CNMI Well Drilling and Operation Regulations, including all required forms and appendices.

2.5.1 The contractor shall commence pump testing within 30-days of contract award. The completion of the entire scope of work shall not exceed 90 days.

2.6 Site Access and Safety: The Contractor shall coordinate with 513 ERHS for site access and adhere to all safety requirements while operating in the MLA. All personnel shall comply with applicable OSHA and DoD safety regulations.

3. ATTACHMENTS

3.1 Attachment 1: MLA Well Locations and Conditions

Attachment 1: MLA Well Locations and Conditions Wells to be tested: Ushi, M10, M05.

Well coordinates and conditions are on the following page.

M05

Ushi Well:

Coordinates: (N15’ 05’ 19.10”, E145’ 38’ 33.80”) Findings: 6” PVC casing. SWL located at 128’. PVC screens start at 130’ and continue to 150’. Bottom of well casing located at 155’ with bottom plug.

M10:

Coordinates: (N15’ 05’ 17.50”, E145’ 38’ 37.60”) Findings: 6” cast iron or steel casing, highly corroded.

SWL at unknown depth. 18” of standing water.

M05 (Monitoring Well):

Coordinates: (N15’ 03’ 31.10”, E145’ 37’ 52.00”) Findings: Monitoring well cap (same as M08). Has padlock, highly corroded. 6” cast iron or steel casing, brittle to touch.

Hole in side of surface casing.

M10

Ushi Well