3-26B-081 Scope of Work.pdf

DIVISION 2

SITE CONSTRUCTION

20475-025-01 02520-1 WATER SUPPLY WELL CONSTRUCTION

April 2026

SECTION 02520

WATER SUPPLY WELL CONSTRUCTION

PART 1 GENERAL

1.01 SCOPE OF WORK

A. The Work to be performed under this Section includes furnishing all labor, materials, equipment, and all other facilities and incidentals necessary to construct, develop, and test public supply water wells. Table 1 shows the well construction and testing details. Table 2 shows the well testing requirements.

Depths, casing lengths, and other details are based on expected conditions and may be adjusted by the Engineer based on the lithology or other results determined during the drilling.

Table 1 Water Supply Well Construction and Testing Details

Item Description

Notes, Acceptance

Criteria, Standard, or Method

1. Completed Well and Borehole Marion Oaks #4 Wells (MO4C and MO4D)

a) Total Well Depth – 250 feet below land surface (bls).

b) Casing – 16 inches.

c) Nominal Borehole Diameter – 16 inches.

d) The total well depth may be extended to approximately 275 feet below grade based on observations made during drilling.

AWWA A100.

FAC 62-555.

FAC 62-532.

Summerglen Wells (SG4 and SG5)

a) Total Well Depth – 275 feet bls.

b) Casing – 16 inches.

c) Nominal Borehole Diameter – 16 inches.

d) The total well depth may be extended to approximately 300 feet below grade based on observations made during drilling.

2. Pilot Hole Marion Oaks #4 Wells (MO4C and MO4D)

a) Borehole Depth – To 275 feet bls.

b) Nominal Borehole Diameter – 8 to 12 inches.

Summerglen Wells (SG4 and SG5)

a) Borehole Depth – To 300 feet bls.

b) Nominal Borehole Diameter – 8 to 12 inches.

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Table 1 Water Supply Well Construction and Testing Details

Item Description

Notes, Acceptance

Criteria, Standard, or Method

3. Well Casing Marion Oaks #4 Wells (MO4C and MO4D)

a) Casing Depth – 175 feet bls.

b) Casing Diameter and Minimum Wall

Thickness – 16-inch-diameter. The minimum wall thickness shall be 0.375 inch.

c) Casing Type – New black steel pipe.

d) Casing Height, Diameter, and Material – The

16-inch-diameter steel well casing shall extend to approximately 3 feet above the finished grade with a blind flange.

e) The casing depth may be extended based on observations during drilling.

AWWA A100.

FAC 62-555.

FAC 62-532.

ASTM A53/A53M.

Summerglen Wells (SG4 and SG5)

a) Casing Depth – 175 feet bls.

b) Casing Diameter and Minimum Wall

Thickness – 16-inch-diameter. The minimum wall thickness shall be 0.375 inch.

c) Casing Type – New black steel pipe.

d) Casing Height, Diameter, and Material – The

16-inch-diameter steel well casing shall extend to approximately 3 feet above the finished grade with a blind flange.

e) The casing depth may be extended based on observations during drilling.

4. Design Capacity Marion Oaks #4 Wells (MO4C and MO4D)

1,000 gallons per minute (gpm).

Sand Content.

Turbidity.

Summerglen Wells (SG4 and SG5)

1,000 gpm.

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Table 1 Water Supply Well Construction and Testing Details

Item Description

Notes, Acceptance

Criteria, Standard, or Method

5. Cement Grout for

16-Inch Casing

Surface and

Underreaming

Annular Grout

Seals

Marion Oaks #4 Wells (MO4C and MO4D)

a) Type I or Type III (ASTM C150/C150M) neat Portland cement or Type IL

(ASTM C595/C595M) Portland-limestone blended hydraulic cement containing not more than 6 gallons of water per 94-pound bag of cement and not more than 5% (by volume) of bentonite clay.

b) A 20-inch-x-16-inch annular space shall be grouted within the top 20 feet and bottom

5 feet of the 16-inch casing.

AWWA A100.

FAC 62-555.

FAC 62-532.

Summerglen Wells (SG4 and SG5)

c) Type I or Type III (ASTM C150/C150M) neat Portland cement or Type IL

(ASTM C595/C595M) Portland-limestone blended hydraulic cement containing not more than 6 gallons of water per 94-pound bag of cement and not more than 5% (by volume) of bentonite clay.

a) A 20-inch-x-16-inch annular space shall be grouted within the top 20 feet and bottom

5 feet of the 16-inch casing.

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Table 2 Well Testing Requirements

Item/Test Frequency/Event Description Acceptance Criteria, Standard, or Method

1. Field Water

Quality

Testing During

Drilling

To be collected by the Contractor during pilot hole drilling from the following intervals: Every change of drill rod within the proposed production zone

(~50 feet to 300 feet or less) and at the end of each step during the step-drawdown test.

Parameters to be analyzed in the field at the time of sample collection:

Temperature, pH, Specific

Conductivity, Chlorides, Oxidation Reduction

Potential (ORP), Dissolved

Oxygen.

Florida Department of Environmental

Protection (FDEP)

Standard Operating

Procedure

(SOP) 001/01.

2. Laboratory

Water Quality

Testing During

Drilling

To be collected by the Contractor during pilot hole drilling from the following intervals: Every

50 feet within the proposed production zone (~50 feet to

300 feet or less).

Parameters to be analyzed by the laboratory: Total

Dissolved Solids, Dissolved Iron, Chlorides, Total Hardness, Color, Sulfate.

FDEP SOP 001/01.

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Table 2 Well Testing Requirements

Item/Test Frequency/Event Description Acceptance Criteria, Standard, or Method

3. Final Water

Quality

Testing

To be collected by the Contractor during the Aquifer

Performance Testing.

Parameters to be analyzed in the field at the time of sample collection:

Temperature, pH, Specific

Conductivity, ORP, Dissolved Oxygen, Turbidity.

Parameters to be analyzed by the laboratory: pH, Per-and polyfluoroalkyl substances (PFAS) by

Method 533, Calcium, Total Dissolved Solids, Dissolved Iron, Chlorides, Magnesium, Potassium, Strontium, Total Hardness, Turbidity, Color, Total

Sulfide, Hydrogen Sulfide, Alkalinity, Dissolved Iron, Total Organic Carbon, Dissolved Organic Carbon, Gross Alpha Radioactivity, Radium 226, Radium 228, and parameters in the

Primary and Secondary

Drinking Water Standards listed in Tables 1, 4, 5, and 6 in Chapter 62-550, FAC.

TTHMs and HAA5

DEP SOP 001/01.

Turbidity

<1 Nephelometric

Turbidity Units

(NTU).

FAC 62-555.345, and

62-550, Part III.

Standard

Method 5710, Formation of

Trihalomethanes and

Other Disinfection

Byproducts. Use

2 mg/L chlorine residual with results at 72 hours.

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Table 2 Well Testing Requirements

Item/Test Frequency/Event Description Acceptance Criteria, Standard, or Method

4. Geophysical

Logging

To be performed at completion of pilot hole.

Caliper.

Natural gamma.

Single-point resistance.

Long (64 inches) and short

(16 inches) normal resistivity.

Temperature.

Fluid resistivity.

Spinner flowmeter (static).

Spinner flowmeter

(dynamic – pumping with at minimum flow of 300 gpm).

To be performed at completion of well construction.

Color borehole video log.

5. Plumbness and

Alignment

Testing

To be completed by the Contractor following final casing installation.

Inclination survey of final casing.

AWWA A100,

Appendix D.

6. Aquifer

Performance

Testing

A Step-Drawdown

Test is required following well development. If required, additional tests may be authorized by the

Owner and Engineer.

The Step-Drawdown Test shall be conducted at four pumping rates of 500 gpm, 650 gpm, 850 gpm, and

1,000 gpm. Field water-quality testing as described in Item 1.

Southwest Florida

Water Management

District (SWFWMD)

Water Use Permit

(WUP) Information

Manual, Part C.

B. The well shall be constructed to public supply standards and requirements as described by SWFWMD, the rules and regulations of FDEP, and any other applicable federal, state, and local rules and regulations. If regulatory or agency requirements conflict with the requirements of the Contract Documents, the

Contractor shall notify the Engineer immediately in writing and await written instruction from the Engineer before beginning work.

C. The Contractor shall coordinate with the Engineer during pilot hole drilling, lithologic sampling, water-quality testing, geophysical logging, casing installation, grouting of casing, and other critical activities designated by the

Engineer.

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D. The Contractor shall obtain all required permits to perform drilling and/or public supply well construction, not including the WUP from SWFWMD or other agency or authority. The Contractor shall perform work in accordance with the

WUP and coordinate any deviations with the Engineer and/or SWFWMD.

E. This Section is intended to be a general description of the required Work but may not cover all contingencies that may occur during well construction. Changes to or deviations from the Work Plan shall not be allowed without prior written approval by the Engineer.

1.02 RELATED WORK

A. The Contract Documents and Specification Section listed below are an integral part of this Section, and the Contractor shall be responsible for providing these

Sections to the well driller, subcontractors, and vendors.

1. Section 02521, Geophysical Logging.

1.03 SUBMITTALS

The Contractor shall submit shop drawings and submittals in accordance with the Contract

Documents.

A. The Engineer will review submittals and results described in this Section. The proposed drilling method(s) and the cement grouting plan shall be submitted for information only. The Engineer’s review shall be only for conformance with the design concept of the Work and for compliance with the information provided in the Contract Documents. The Engineer’s review shall not relieve the Contractor from responsibility for any deviation(s) from the Contract Documents unless the

Contractor has called the Engineer’s attention to such deviation(s) in writing at the time of submission and the Engineer has given written concurrence and approval to the specific deviation(s). The Engineer’s review shall not relieve the

Contractor from the responsibility of meeting the criteria for well acceptance and warranty requirements specified in this Section.

B. The following shall be submitted to the Engineer for review before construction:

1. Equipment to be used.

2. Schedule for sample collection (depths/timing).

3. Analytical laboratory.

4. Casing and materials specifications.

5. Mill/material certificates.

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6. Description of drilling and grouting plan (including proposed drilling method and handling of fluids during drilling and well development).

7. Copies of applications and permits.

C. The following shall be submitted to the Engineer for review during or after the drilling and well construction as designated by the Engineer:

1. Daily Drilling Reports.

2. Formation Samples.

3. Geophysical Logs.

4. Water Quality Sampling Results

5. Aquifer Performance Test Results.

6. Water Management District (WMD) Well Completion Report.

D. During drilling of the well, the Contractor shall prepare Daily Drilling Reports that include the following:

1. Daily static water level elevation measurements from a known reference point.

2. Elevation of the reference point for all depth measurements in feet North

American Vertical Datum of 1988 (NAVD88).

3. Depth at which changes of formation occur.

4. Depth and interval of each cavity or void encountered during drilling.

5. Identification of the material of which each stratum is composed.

6. Depth interval from which each formation sample is taken.

7. Depth interval from which each water sample is taken.

8. Depth at which the hole diameter changes.

9. Depth at which the drilling method is changed.

10. Other pertinent data requested by the Owner or Engineer.

A sample Daily Drilling Report is included at the end of this Section.

E. Two washed formation samples (split samples) shall be collected during drilling at every 10-foot interval and at formation changes. Washed formation samples shall be collected and preserved immediately on retrieval in a Hubco 3.5-inch-x-

5-inch sample bag or in a similar manner approved by the Engineer. Each sample container shall be clearly and permanently labeled with the following information:

1. Physical location of the well.

2. Name or number of the well.

3. Depth interval represented by the sample.

4. Date taken.

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5. Time taken.

6. Split number.

F. Within 7 days of completing the well, the Contractor shall submit to the Engineer a written report and Record Drawings to include the following minimum information:

1. Total depth and nominal diameter of the pilot hole and the final well.

2. Complete description (including length, diameter, depth, and mill/material certificates) of all casings.

3. Depth or location of any lost drilling fluid, drilling materials, or tools.

4. Type and amount of drilling fluid additives used.

5. Amount of cement (bags or cubic feet) used in grouting the well annulus and pilot borehole; the grout/water mixture used; and the grouting method used.

6. Details of cement plugging, if performed, including top and bottom depths and borehole diameter of plugged intervals, and quantity of cement material used.

7. Type, including make, size, and horsepower of each test pump used during well drilling and testing.

8. Other pertinent data requested by the Engineer.

1.04 REFERENCE STANDARDS

Reference standards and recommended practices referred to in this Section shall be the latest revision of any such document in effect at the bid time. The following documents are a part of this Section. Where this Section differs from these documents, the requirements of this Section shall apply.

A. American National Standards Institute/National Sanitation Foundation

(ANSI/NSF)

1. ANSI/NSF 60—Drinking Water Chemicals.

2. ANSI/NSF 61—Drinking Water System Components.

B. American Petroleum Institute (API)

1. API 5L—Line Pipe.

C. American Society for Testing and Materials (ASTM)

1. ASTM A53/A53M—Standard Specification for Pipe, Steel, Black and

Hot-Dipped, Zinc-Coated, Welded and Seamless.

2. ASTM C150/C150M—Standard Specification for Portland Cement.

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3. ASTM C595/C595M—Standard Specification for Blended Hydraulic

Cements.

4. ASTM F480—Standard Specification for Thermoplastic Well Casing Pipe and Couplings Made in Standard Dimension Ratios (SDR), SCH 40 and

SCH 80.

D. American Water Works Association (AWWA)

1. AWWA A100—Standard for Water Wells.

2. AWWA C654—Standard for Disinfection of Wells.

E. American Welding Society (AWS)

F. The Contractor shall complete the work described in this Section in accordance with the rules, regulations, and guidance documents of the applicable WMD, FDEP, and other applicable regulatory agencies.

1.05 WARRANTIES

A. Warranties shall be in accordance with the Contract Documents.

B. All materials supplied under this Section shall be warranted for 1 year by the

Contractor and material manufacturers. The manufacturer's warranty period shall run concurrently with the Contractor's warranty period. The warranty period for the well shall begin on the Final Completion Date of the well as specified in the

Contract or Purchase Order or on completion and acceptance by the Owner of testing or remedial procedures.

C. The materials shall be warranted to be free from defects in workmanship and design. Any materials that fail during the warranty period shall be replaced and the unit(s) restored to service at no expense to the Owner.

1.06 DELIVERY, STORAGE, AND HANDLING

A. The Contractor shall adhere to the requirements specified in the Contract

Documents for storing and protecting the items specified in this Section.

B. Properly protect all materials so that no damage or deterioration will occur, including properly protecting finished or machined metal surfaces that are not painted to prevent rust and corrosion.

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C. Protect water samples from freezing, store the samples on ice at 4° Celsius (°C) until received by the laboratory, and ship or deliver samples to the laboratory within the timeframes and as prescribed by FDEP SOP 001/01.

1.07 QUALIFICATIONS

A. The drilling contractor responsible for constructing the well shall be licensed in

Florida as a Water Well Contractor employing only competent workers for the execution of this Work, and all such Work shall be performed under the direct supervision of an experienced well driller acceptable to the Owner and Engineer.

B. The supervising well driller shall demonstrate in writing at least 5 years of related experience in the construction of wells similar to that specified here and shall provide written information about the drilling equipment used. Qualifications of the supervising well driller for this Project shall be given by listing representative projects completed in the last 5 years, owner’s name, and owner’s telephone number.

C. The well driller shall be capable of identifying subsurface materials, maintaining complete and current well logs and daily notes for the well completion report, and developing and testing the well.

D. The individual responsible for proper collection and documentation of water-quality samples for the Final Water Quality Testing shall, in accordance with

FDEP SOP 001/01, demonstrate in writing at least 1 year of related experience in environmental water-quality sampling similar to that specified here and shall provide written information about the sampling equipment used. Qualifications of the individual responsible for sampling for this Project shall be given by listing representative projects completed in at least the last year, including the owner's name and telephone number.

E. The Owner and Engineer may make any other investigations deemed necessary to determine the ability of the Contractor to perform the Work, and the Contractor shall furnish the Owner and Engineer with all such information and data for this purpose as the Owner and Engineer may request. The Owner and Engineer reserve the right to disqualify a contractor not in compliance with these requirements.

F. The Contractor shall, on request, furnish satisfactory evidence that all materials to be furnished in performing the specified Work are new. All the Contractor’s equipment to be used in performing the work shall be in good working order. If the Contractor’s equipment malfunctions, the Contractor is responsible for re-performing the work at no additional cost to the Owner.

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1.08 RECORD DRAWINGS

A. Record Drawing requirements are identified in Paragraph 1.03.F of this Section.

1.09 PERMITS

A. The Contractor shall, within 5 working days following receipt of Notice to

Proceed, apply for a State of Florida Well Construction Permit from the Marion

County Health Department to construct the wells specified in this Section in accordance with the rules of the WMD. The Contractor shall also obtain at their expense all permits required by the Owner and all regulatory agencies. The approved permits shall always be available for inspection at the site during construction. The Contractor shall be responsible for obtaining permit time extensions in accordance with the Marion County Health Department if well construction extends beyond the valid permit date. The Contractor shall be responsible for completing the well completion report to the satisfaction of the

WMD and Marion County Health Department. A copy of the report shall be provided to the Engineer.

B. The Contractor shall be responsible for obtaining any additional federal, state, and local permits required for constructing the wells and preparing the site

(e.g., clearing the site for work or access). The Contractor shall be responsible for coordinating permitting of any water discharged from the site with the Engineer.

C. The Contractor shall not perform any drilling work on the wells until all required permits are obtained. Mobilization, above-grade site preparation, and site work can be performed before a well construction permit is issued.

D. All Work shall be in accordance with the conditions set forth in the permits.

If permitting requirements conflict with the requirements of the Contract

Documents, the Contractor shall notify the Engineer immediately in writing and await written instruction from the Engineer before beginning work.

1.10 CRITERIA FOR WELL ACCEPTANCE

A. The sand content in the water from the completed production well shall not at any time exceed 5 milligrams per liter (mg/L) while the well is being pumped at the design capacity. Sand content shall be determined at every rod change during drilling of the production interval using a Rossum sand tester or approved equivalent.

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B. The turbidity of the water from the completed production well shall not exceed

1 NTU as measured on a calibrated turbidimeter while the well is being pumped at the design capacity.

C. Plumbness and Alignment

1. The well shall be constructed and all casings and liners set round, straight, and plumb to allow pump equipment to be installed. Plumbness and alignment of the pilot hole shall be tested via an inclination survey.

Plumbness and alignment of the final casing shall be tested as described in

Appendix D of AWWA A100 or an equivalent method approved by the

D. No payment shall be due to the Contractor if the well fails to meet all of the above

“Criteria for Well Acceptance” requirements due to fault by the Contractor.

1.11 ADDITIONAL WORK

A. At the option of the Engineer and/or Owner, additional work may be authorized.

Additional work shall be completed at prices listed in the Bid Form or at prices not exceeding those of comparable work and materials as authorized by the

Owner if no Bid Prices are applicable.

PART 2 PRODUCTS

2.01 CASING

A. The production well casing shall be uniform in roundness and wall thickness. The well casing shall be as described in Article 1.01 of this Section.

B. All casing diameters described in this Section shall be inside diameters.

C. The Contractor shall submit copies of the mill certificates to the Engineer for approval before the casing is shipped to the site.

D. If necessary, as part of the Contractor’s proposed drilling plan, the Contractor shall install surface casing to a depth to be approved by the Owner. The surface casing shall be uniform in roundness and wall thickness and shall be as described in Article 1.01 of this Section. The surface casing is intended for constructing the production well only. The surface casing shall be watertight and of such weight and design as necessary to prevent entrance of sand and unconsolidated material and to permit its installation without distortion or rupture to the depth and dimension shown.

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E. All field welding shall be performed to AWS standards. Casing ends to be connected by field welding shall be beveled. The welded casing joint shall develop a strength equal to 100% of the pipe strength. If the joint fails or breaks, the Contractor shall be responsible for abandoning, repairing, or replacing the well at no additional cost to the Owner.

F. The well casing pipe shall be capable of supporting all attached weight, including but not limited to the weight of the casing, the weight of the pump and accessories, and the weight of the drop pipe with a minimum safety factor of 2.0.

2.02 CEMENT GROUT

A. The grout shall be as described in Article 1.01 of this Section. The grout mixture shall be subject to testing at the discretion of the Owner or Engineer. Grout not meeting the specifications shall be rejected and shall be immediately removed from the Project site and properly disposed of at no cost to the Owner.

2.03 TEST PUMPING EQUIPMENT

A. For the aquifer performance testing, the Contractor shall provide a test pump adequate to discharge at the design capacity (gpm) under atmospheric conditions and shall provide an enclosed conduit so that the depth-to-water level during pumping may be measured using an electric tape or electronic water-level data-logger.

B. Electric power may not be available at the site at the time of drilling. The

Contractor is responsible for providing a generator for all test pump equipment.

Any generator used for test pumping the well shall have the necessary capacity to adequately power the selected test pump through the pumping period and discharge range.

C. The discharge pipe shall be of a diameter and length adequate to transmit water from the well site to a designated discharge point a minimum of 500 feet downgradient in accordance with the WMD guidelines for aquifer performance testing. The Contractor shall provide suitable piping, silt fencing, or other materials to avoid erosion during the discharge of water. The Contractor shall coordinate with all regulatory agencies to determine an acceptable discharge location and the proper discharge method. The discharge pipe shall be in good condition and free from leaks. A duplex hose bibb suitable for collecting representative water samples shall be on the discharge piping upstream of the flow meter and as approved by the Engineer. Hoses shall not block or impede vehicular traffic.

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D. The Contractor shall provide a valve at the well head suitable for controlling flow through the discharge pipe.

E. The Contractor shall provide a flow meter calibrated for the range of the required test and designed flow and pipe size and capable of accuracy within 5% or better.

The Contractor shall furnish the Engineer with flow meter calibration certificates for all flow meters used. Flow meter(s) shall have been calibrated within 3 months before testing activities. The flow meter shall be installed as specified by the flow meter manufacturer for accurate operation. The flow meter shall be a minimum of

10 pipe diameters upstream from the flow-control valve and five pipe diameters from any bend in the discharge line. The meter(s) shall be capable of accurately showing flow rates appropriate for the test being conducted as approved by the

F. The Contractor shall provide InSitu Minitroll or Schlumberger Diver data logging pressure transducers (or equivalent equipment approved by the Engineer) to be used during testing. Data loggers shall be capable of measuring water levels accurately to within 0.01 foot and in linear and logarithmic time scales. The data logger shall be capable of recording water levels at an interval of 1 second or less.

All devices shall be in good working condition and shall have been factory calibrated within 1 year of the test. The Contractor shall supply all associated hardware and software for operating the data loggers.

2.04 WELL COVERS

A. Whenever work on the well is interrupted, such as during an overnight shutdown, the well opening shall be sealed with a substantially non-removable (except by the

Contractor) cover in accordance with the rules of the applicable WMD. At all times during well construction, the Contractor shall use necessary precautions to prevent tampering of the well and the entrance of foreign material into the well.

B. The Contractor shall be responsible for lowering the water level in the well bls with a salt solution if necessary and shall maintain control of the well throughout the Project to prevent discharge of water from the well.

2.05 DRILLING FLUIDS

A. Using special drilling mud, fluid additives, or lost circulation material must have prior approval by the Engineer and must be acceptable to FDEP, applicable

WMD, and other agencies if applicable for use in raw water supply wells that provide potable water to a municipal system.

B. All water used in constructing the well shall be clear, chlorinated water unless written approval is secured from the Engineer in advance. If water is not available

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at the well site, the Contractor shall be responsible for providing any piping or water-hauling vehicles (tankers) needed to convey water at the Work site.

PART 3 EXECUTION

3.01 BOREHOLE CONSTRUCTION

A. All boreholes shall be drilled using clean, uncontaminated equipment in good working order and free from fuel, oil, and hydraulic fluid leaks or discharges.

The drilling equipment (i.e., rig, drill bit, rod, etc.) shall be in good condition and appropriate for rapid and correct completion. The flow of water at the site during drilling shall be controlled to prevent excessive flooding of the site and adjacent roads. The Contractor shall dig a settling basin, if required, to control the flow.

B. The drilling method proposed by the Contractor shall allow all the testing described in this Section.

C. The pilot borehole and final reamed borehole shall be constructed to the dimensions identified in Article 1.01. The boreholes shall be drilled straight and plumb. The pilot hole shall be drilled to the total depth before the production well casing is installed.

D. During drilling, water-quality measurements and sample collection for laboratory analysis shall be conducted as described in Articles 1.01 and 3.04. The drilling method selected by the Contractor shall allow collection of water-quality and formation samples as described in this Section.

E. The Contractor shall dispose of all cuttings. A complete set of samples of the cuttings shall be provided to the Engineer as described in Article 1.03 of this

Section.

F. At the earliest time possible after the saturated limestone of the Floridan aquifer has been penetrated, drilling with additives shall be discontinued.

3.02 CASING INSTALLATION

A. All casing shall be as specified in Articles 1.01 and 2.01 of this Section. Casing installation must be completed in accordance with the requirements of the applicable WMD.

3.03 GROUTING

A. Grouting shall be performed in accordance with the requirements of the applicable WMD and AWWA. The drilling contractor will underream a 20-inch-

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diameter borehole over a 5-foot-long section using an underreamer tool before grouting and seating the 16-inch casing. The driller shall pressure grout by the tremie method, using a volume of neat cement at least 150% the volume of the enlarged borehole around the bottom of the casing. After pressure grouting the bottom 5 feet of the 16-inch casing, the Contractor shall inject a neat cement grout seal in the annular space of the upper 20 feet of casing. Cement additives may only be used when approved in writing by the Engineer.

B. The Contractor shall perform all grouting and sealing of the well in the presence of the Engineer and, if required, a WMD or Marion County Health Department representative. The Contractor is responsible for notifying the Marion County

Health Department and Engineer a minimum of 2 working days before beginning grouting operations. No drilling operations or other work in the well shall be permitted until at least 24 hours after grouting the well or a minimum of 12 hours if quick-setting cement is used and the Contractor can demonstrate adequate setting of the cement grout.

C. The Contractor shall be responsible for any damage to the well casing resulting from cementing operations and for all costs required to correct such damages.

3.04 WATER QUALITY TESTING

A. The Contractor shall be responsible for proper collection and documentation of water-quality samples, in accordance with FDEP SOP 001/01. Proper chain-of-custody protocols are to be maintained at all times. Each sample container shall be clearly and permanently labeled with the following information:

1. Physical location of the well.

2. Name or number of the well.

3. Depth interval represented by the sample.

4. Date taken.

5. Time taken.

6. Split number (if applicable).

B. The Contractor is responsible for obtaining water-quality sample containers

(sample kits) packed in coolers from the laboratory. All samples are to be stored at 4°C at all times. The Contractor is responsible for properly labeling, packing, and shipping or transporting the samples to the laboratory and for generating the chain-of-custody forms. The Contractor is responsible for all laboratory fees.

C. The laboratory or laboratories used for analysis of water-quality samples shall be

National Environmental Laboratory Accreditation Conference (NELAC) certified by the Florida Department of Health for those Drinking Water Parameters to be reported. Laboratory reports shall be submitted to the Engineer in electronic and

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paper formats consistent with the reporting requirements of FAC 62-160. The paper submittal shall provide data in the FDEP Safe Drinking Water Program

Laboratory Reporting Format – FAC 62-550.730. The electronic submittal shall include a PDF copy of the paper submittal and the analytical data reported in .xls, .csv, or tab-delimited .txt format consistent with FDEP Water Assurance

Compliance System (WACS)/Validator program requirements for importing into

FDEP databases.

D. Water-quality samples shall be collected by the Contractor during drilling as specified in Article 1.01. The Contractor shall provide the Engineer notice before these samples will be collected.

E. Water-quality samples shall be collected by the Contractor during the aquifer performance testing to be analyzed for final well clearance as a public water system component as specified in Article 1.01. The Contractor shall provide the

Engineer with at least 72 hours’ notice before these samples are collected.

F. Review copies of the field-collected data and measurements, instrument calibration logs, chain-of-custody forms, and similar documentation of sampling shall be submitted to the Engineer within 72 hours of sample collection.

3.05 WELL DEVELOPMENT

A. The well shall be developed by surging, interrupted over-pumping, or other methods as approved in writing by the Engineer. The Contractor shall provide a pump capable of at least 1,500 gpm with variable-speed capability. The

Contractor shall demonstrate that the well meets the acceptance criteria under

Article 1.10, Criteria for Well Acceptance, of this Section. The Contractor shall secure prior written approval from the Engineer of any changes in the sand-content testing method.

B. Turbidity shall be measured on site by a method approved by the Engineer on water samples collected after 5 minutes of uninterrupted pumping at the design capacity. Pumping for the turbidity test shall begin after a rest period of at least

5 minutes.

C. The Contractor shall attempt to meet the development criteria by the methods outlined. If the development criteria are not met after 16 hours of development using methods approved by the Engineer, the Engineer, Owner, and Contractor shall meet to evaluate alternative development methods. Placing the entire burden on the Contractor is not the intent of these criteria for circumstances and events beyond the Contractor’s control. If, after due diligence by the Contractor, Owner, 20475-025-01 02520-19 WATER SUPPLY WELL CONSTRUCTION and Engineer, the development criteria cannot be met, these criteria may be revised as appropriate.

3.06 AQUIFER PERFORMANCE TESTING

A. The aquifer performance testing will consist of background water level monitoring followed by a step-drawdown test performed on the completed and developed production well. The Contractor shall conduct the step-drawdown test on the completed well in which the well shall be pumped at the four escalating rates shown in Article 1.01. Discharge rates and drawdown shall be measured and recorded. Each pumping rate shall be maintained for a minimum of 1 hour.

Pumping at the final flow rate shall continue for up to 4 hours or until achieving stability as defined by a change in water level that is not more than 0.1 foot in

1 hour. At the conclusion of the pumping period, the pump shall be shut off and the well shall be allowed to recover for at least 24 hours.

B. The Contractor shall notify the Engineer at least 72 hours before starting the aquifer performance test. The schedule for the test shall be approved by the

C. The Contractor will not be paid for incomplete tests and shall be responsible for all of the costs of the Engineer during failed tests. The Engineer shall be the sole judge of data integrity.

D. The Contractor shall be solely responsible for proper installation, testing, operation, and maintenance of the test and data collection equipment (pump, valves, discharge pipe, duplex hose bib, data loggers, etc.) as described in

Article 2.03 of this Section. The pump and all measuring or testing equipment must be disinfected before being placed in the well.

E. The Contractor shall conduct the test in the following manner:

1. The Contractor shall notify the Engineer before beginning testing or data logger operations.

2. The Contractor shall install water level pressure transducers with data logging capabilities in the newly drilled well and an additional transducer shall be installed in the other production well at each Project site.

3. Background groundwater levels shall be recorded a minimum of 24 hours before beginning the aquifer performance test. Water levels shall be recorded at a maximum interval of 15 minutes during the background period.

4. While pumping, for at least 1 minute before and 5 minutes after starting the pump or changing the pumping rate, water levels should be recorded at a maximum interval of 1 second. The recording interval may be

20475-025-01 02520-20 WATER SUPPLY WELL CONSTRUCTION

lengthened after the water level has stabilized but may not exceed

1 minute.

5. Following the end of pumping, water levels shall be recorded at a maximum interval of 1 second for at least 15 minutes. The recording interval may be lengthened for the duration of the recovery period but may not exceed 15 minutes.

F. The Contractor shall operate the pump without interruption at no more than 5% fluctuation in the designated rate of discharge during the full period of the aquifer performance test. During well testing, the Contractor shall record discharge rates at a maximum interval of 15 minutes. If a test is started but must be stopped due to equipment breakdown or inadequate supervision by the Contractor, no extra payment will be made for the time spent pumping before the test had to be stopped or the time spent waiting for recovery before the test is restarted. If any part of the pumping equipment fails to operate properly or impairs the proper functioning of another element or instrument involved in the test, the equipment shall be removed and repaired at the expense of the Contractor and no extra payment will be made for the delay.

G. The Contractor shall provide the results of the aquifer performance test to the

Engineer immediately on the test’s completion. Electronic data from the logger shall be given to the Engineer in an ASCII tabular format or Microsoft Excel file format. The Contractor shall retain a copy of the data for his records. Final design of the well pump and above-grade facilities is contingent on the results of the aquifer performance tests and requires a timely submittal.

3.07 GEOPHYSICAL LOGGING

A. The Contractor shall run the geophysical logs called for in Article 1.01 and

Section 02521, Geophysical Logging, on the open pilot hole from the total depth of the well to the ground surface and the completed well. The Contractor shall provide the Engineer with electronic copies of the logs (in .PDF and .LAS formats) and two copies of the video log on a Universal Serial Bus (USB) flash drive.

3.08 PACKER TESTING (ADDITIVE BID ALTERNATE ONLY)

A. Complete one straddle packer or off-bottom packer test within the interval from

50 feet to 300 feet. Collect hydraulic data and two water-quality samples during the packer testing. The goal of these packer tests is to assess lower zones for casing depth, define ambient groundwater quality, and evaluate hydraulic characteristics of the interval. Two separate tests will be run at each packer test setting depth, testing below the packer and above the packer (annulus).

20475-025-01 02520-21 WATER SUPPLY WELL CONSTRUCTION

3.09 WELL DISINFECTION

A. Disinfection by chlorination shall be in accordance with AWWA A100 and

AWWA C654.

B. Well pumps and other permanent equipment and material to be installed in the well shall be chlorinated before installation. After permanent equipment is installed, the well shall be chlorinated before putting the well or pumping system into service.

3.10 PRODUCTION WELL ABANDONMENT

A. If the Contractor fails to complete a well in accordance with this Section or

WMD, state, or local rules, the well shall be abandoned. If the Contractor must abandon the well, it shall be plugged in accordance with the rules and procedures of the applicable WMD.

B. If the Contractor must abandon the well due to unacceptable water quality or flow rate, documented costs of drilling and abandonment will be borne by the Owner.

C. If the Contractor must abandon the well through fault of the Contractor or the

Contractor’s employees or subcontractors, the costs of drilling and abandonment shall be solely borne by the Contractor.

3.11 PROTECTION AND SITE CLEANUP

A. At all times during the progress of the Work, the Contractor shall use necessary precautions to prevent tampering with the wells and/or allowing foreign material to enter them.

B. Immediately on disinfecting the well, the Contractor shall remove all equipment, materials, and supplies from the site of the Work; remove all surplus materials and debris; and fill in all holes or excavations. The Contractor shall also regrade the site to conform to the contours of the land before Work started. Not more than

7 calendar days shall be allowed for this site restoration, and the Contractor shall complete all site restoration work within that time.

3.12 NOTIFICATION

A. The Contractor shall provide written notification to the Engineer a minimum of

72 hours before beginning the well construction and/or testing activities to allow the Engineer to have a resident observer present. The Engineer's representative shall be on site for installation of casing, grouting, geophysical logging, and final well testing conducted at the site, unless otherwise authorized.

20475-025-01 02520-22 WATER SUPPLY WELL CONSTRUCTION

DAILY DRILLING FIELD REPORT

DATE

JOB #

PROJECT: WELL NAME/NUMBER:

DRILLER / HELPERS:

REFERENCE POINT (GROUND, TOP OF CASING, ETC): DEPTH TO STATIC WATER LEVEL (FT):

TIME RECORDED:

WEATHER: CLEAR OVERCAST RAIN HEAVY RAIN

TEMPERATURE (°F): <32 32-50 50-70 70-85 >85

WIND: STILL MEDIUM HIGH

HUMIDITY: DRY MODERATE HUMID

DRILLING CASING CORING

METHOD:_______________ MATERIAL:______________ CORE DIA: __________

BIT DIA: ____________ CASING DIA: ____________ DEPTH: FROM ________

DEPTH: FROM _________ DEPTH: FROM ____________ TO _______________

TO _______________ TO _______________ TIME: FROM __________

TIME: FROM ____________ TIME: FROM ______________ TO _______________

TO _________________ TO _________________

FOOTAGE

RECOVERED:___

GROUTING MOB/DEMOB

DEPTH: FROM __________ TIME: FROM __________

TO _____________ TO _____________

TOTAL # OF BAGS:_______

FORMATIONS ENCOUNTERED

DESCRIPTION

DEPTH COMMENT / SAMPLE

DESCRIPTION (CUTTING,

WATER QUALITY, ETC.) FROM TO

COMMENTS:

END OF SECTION

20475-025-01 02521-1 GEOPHYSICAL LOGGING

SECTION 02521

GEOPHYSICAL LOGGING

PART 1 GENERAL

1.01 SCOPE OF WORK

A. The Contractor shall furnish all labor, materials, equipment, and all other facilities and incidentals necessary to characterize subsurface conditions and well construction using geophysical and color video logging at the well installed under this Contract. The geophysical and other surveys identified in Paragraph 3.01B of this Section shall be performed on the well.

B. The term geophysical logging as used in this Section means all geophysical, temperature, flow, video, location, and other downhole surveys and collection of fluid samples using wireline apparatus.

C. This Section is intended to give a general description of what is required but does not cover all variables and conditions that may occur. The Contractor shall complete the logging to the satisfaction of the Engineer whether every detail is specifically mentioned or not.

1.02 RELATED WORK

A. The Contract Documents and Specification Section listed below are an integral part of this Section and the Contractor shall be responsible for providing these

Sections to the well driller, subcontractors, and vendors.

1. Section 02520, Water Supply Well Construction.

1.03 SUBMITTALS

The Contractor shall submit shop drawings and submittals in accordance with the Contract

Documents.

A. The Engineer shall review Shop Drawings, geophysical log samples, and other required submittals. The Engineer’s review shall only be for conformance with the design concept of the Project and for conformance with the information provided in the Contract Documents. The Engineer’s review shall not relieve the

Contractor from responsibility for any deviations from the Contract Documents unless the Contractor has called the Engineer’s attention to such deviation at the

20475-025-01 02521-2 GEOPHYSICAL LOGGING

time of submission in writing and the Engineer has given written concurrence to the specific deviation.

B. Ten days before beginning logging, the Contractor shall submit a list of materials and personnel to be used in the geophysical and video logging of the well.

Materials required, establishing compliance with the Specifications, shall include but are not limited to the following items:

1. Type of logging units and types of logging tools available.

2. Hole diameter limitations of tools.

3. Personnel doing the logging.

4. Number of years’ experience the geophysical logging personnel have.

C. During logging of the well, the logging Contractor shall maintain a complete written record at the well site detailing the following:

1. Reference point for all depth measurements.

2. Depth at which each formation-change occurs.

3. Depth of the bottom of the casing.

4. Logging speed and direction.

5. Depths of significant voids within the open borehole.

6. Other pertinent data requested by the Engineer.

D. A daily detailed logger’s report shall be recorded during the logging of the well and permanently maintained. The daily detailed logger’s report shall be submitted as requested by the Engineer. The report shall completely describe the number of feet logged, types of logs run, number of hours on the job, shutdown due to breakdown, any downhole problems during the logging, and other pertinent data requested by the Engineer.

E. The Contractor shall provide field hardcopy plots, video recordings, and digital files in .PDF and .LAS (or binary) format as appropriate at the completion of the day’s logging activities. These plots shall be stamped “DRAFT,” provided before leaving the site, and considered as provisional data until the Contractor certifies them as final. All geophysical well log header files shall include the latitude and longitude with datum for the well and the well name.

F. Within 7 days after logging the well, the Contractor shall finalize processing of the logs, certify them as final, and submit final well logs to the Engineer. Final log processing shall be completed by the geophysical logging contractor to ensure that logs are depth referenced to land surface, graphic plots are scaled such that

1 inch equals no more than 20 feet of depth, data quality is verified based on probe calibrations, sufficient well header information is included so that the well location and logging conditions are identified, and digital files are compatible for

20475-025-01 02521-3 GEOPHYSICAL LOGGING

import into WellCAD software (e.g., LAS, Century binary for acoustic logs, Mount Sopris RD files). Final well logs shall be submitted as hard copy plots and as electronic files in .PDF format along with the WellCAD-compatible digital log data files. If file size permits, emailing to the Engineer is the preferred method of submittal. Video surveys shall be submitted on a USB flash drive or other approved transfer device.

G. The Contractor shall supply four paper copies and one electronic copy of each final geophysical log. The geophysical logs shall include the following:

1. Total depth and diameter of the logged open hole.

2. Depth or location of any lost tools or wire line.

3. Depth and diameter of the casing.

4. Type of log.

5. Units of measurements.

6. Scale.

7. Name of operator.

8. Rate of logging.

9. Other pertinent data requested by the Engineer.

H. Flowmeter log headers shall include the amount of water being pumped if applicable, trolling direction of the probe (up, down), average line speed if not included as a log trace, and scaled so that a reported value (constant pressure system [cps], revolutions per minute [rpm], or gallons per minute [gpm]) increase represents upward fluid flow.

I. All logs shall become the property of the Owner and shall be available for inspection by the Owner during logging.

1.04 QUALIFICATIONS

A. The Contractor responsible for geophysical and video logging shall employ only competent workers for the execution of the Work, and all such Work shall be performed under the direct supervision of an experienced geophysical logger satisfactory to the Engineer.

B. The geophysical logger shall be capable of interpreting the geophysical logs, maintaining complete and current geophysical well logs, and taking daily notes.

C. The Owner may make any other investigations deemed necessary to determine the ability of the Contractor to perform the Work, and the Contractor shall furnish to the Owner all such information and data for this purpose as the Owner may request.

20475-025-01 02521-4 GEOPHYSICAL LOGGING

D. The Contractor shall furnish satisfactory evidence, on request, that all equipment to be used in performing the specified Work is in good working order.

E. The Contractor shall ensure that all logging tools shall be capable of accurately logging a borehole that is 8 inches or greater in diameter.

1.05 NOTIFICATION

A. Ten days before beginning Work, the Contractor shall provide the proposed Work schedule to the Engineer in writing, including the following:

1. Starting date of the well logging.

2. Completion date of the well logging.

B. Ten days before beginning Work, the Contractor shall notify the Engineer, in writing, of the number of logging units and personnel to be used on the…