Specifications_23-0884.pdf

23-0884-ITB-C

SPECIFICATIONS

PINELLAS COUNTY PURCHASING ITB –PURCHASING CONSTRUCTION REVISED: 05/2023

SPECIFICATIONS:

Bid Title: WELL SERVICES FOR PINELLAS COUNTY UTILITIES

Bid Number: 23-0884-ITB-C

Work includes, but is not limited to: evaluation, maintenance, repair, rehabilitation, and construction of wells owned and managed by the Pinellas County Utilities Department. Contractor will be responsible for providing all materials, equipment, skills, tools and labor necessary and incidental for performance of these services.

A. BACKGROUND

Wells are primarily located in north Pinellas County, but several wells are also located in Pasco County at the Cross Bar and Al Bar Ranch properties and other areas of mid and south Pinellas County. Well types include but are not limited to: augmentation water supply wells, private potable supply wells, irrigation supply wells, surficial aquifer monitoring wells, and upper Floridian aquifer monitoring wells, . The existing augmentation wells and private potable supply wells at the Cross Bar / AL Bar Ranch property were all constructed in the 1990s and will likely require some maintenance during this contract.

B. WORK ASSIGNMENTS

Work assignments will be required for services D2 through D10 as described under Section C, Scope of Services below.

1. All Work for services D2 through D10 as defined in Section C, Scope of Services shall be executed by the Contractor on an assignment-by-assignment basis as needed, in the form of a Work Assignment (Attachment 1) authorized by the County Project Manager. Sections D2 through D10 can be utilized multiple times as directed by the County Project Manager. There is no guarantee that all Sections between D2 through D10 will be utilized. Pinellas County does not guarantee Work Assignments will be concurrent and/or consecutive. The Contractor shall perform no Work for Services D2 through D10 under this Contract without the County Project Manager’s written authorization to proceed for each Work Assignment. The Contractor hereby agrees to waive any claim for compensation for any Work performed without authorization.

2. Each individual location contained in a Work Assignment is to be considered an “individual project” such that all Work, including demobilization and cleanup, must be fully completed in the time frame as specified in the Work Assignment, as approved by the County Project Manager.

3. All Work shall be performed in an expeditious and professional manner. The Contractor shall have sufficient crews and equipment to perform all Work at the time the Work Assignment is issued. The inability of the Contractor to meet contractual obligations, or to perform assigned Work in a satisfactory manner, shall be grounds for termination of the Contract, and/or reassignment of the Work to other contractors, in the County’s sole discretion. The County Project Manager reserves the right to add or delete sites and locations from the Work Assignments. There are no guaranteed Work Assignment locations in the “Bid Submittal Sheets”.

4. At the request of the County Project Manager to begin a Work Assignment, the Contractor shall respond to the County Project Manager within seven (7) Calendar Days via email, and by meeting with the County Project Manager to inspect the job site. The Contractor shall provide the County Project Manager via email a cost proposal and schedule to complete the Work Assignment. Contractor must also provide a detailed Scope of Work, pay items, quantities, and unit pricing in accordance with the Bid Submittal Sheets, and any Unspecified Work shall be thoroughly described.

C. UNSPECIFIED WORK:

Work may include "Unspecified Work" that may be associated with a Work Assignment in this contract or as otherwise identified by the Design Professional/Engineer/Project Manager. Any amount of extra work and/or alterations to this contract charged to “Unspecified Work” must be fully documented and approved in writing, in advance, by the Design Professional/Engineer/Project Manager. All work performed under “Unspecified Work” must be completed in accordance with all conditions and requirements of this contract and must include the work to be done by all necessary subcontractors and/or suppliers.

“Unspecified Work” means the stated fixed sum of money, in writing, to be used only at the Design Professional/Engineer/Project Manager’s specified direction. The particular requirements and items will be provided to the Contractor at the appropriate time and must apply only to additional items over and above those specified/indicated in the specifications for this contract.

For equipment under the control of the Contractor through direct ownership, leasing, renting or other method of acquisition not included in the bid, the Contractor must furnish cost data, which may assist the Design Professional/Engineer/Project Manager in the establishment of an equitable rate.

D. POTENTIAL SCOPE OF SERVICES

D1. Well maintenance D2. Well evaluation services D3. Well deepening D4. Well clearing services D5. Well back-plugging services D6. Well rehabilitation chemical treatment D7. Well repair services D8. Well construction services D9. Test Pumps D10. Well Abandonment D11. Augmentation Well System Maintenance and Repair

E. GENERAL CONTRACTOR RESPONSIBILITIES:

1. Contractor is to provide a licensed well driller and at least one highly experienced helper, as required, to perform the services requested.

a. Contractor’s personnel must be able to complete all tasks, including but not limited to: construction of wells, development of wells, rehabilitation of wells, well abandonment, geophysical logging, downhole video surveying, specific capacity testing, and electrical services

2. Contractor is to furnish and maintain all equipment and support equipment in working order to prevent delays resulting in maintenance, loss of scheduled work time or malfunction.

a. Contractor’s drilling rigs and support equipment shall be reviewed by County prior to any work and is subject to County Project Manager’s approval.

3. Contractor’s drilling personnel will be required to keep accurate well logs and reports of daily activities performed, as instructed by the Project Manager, including documentation of the well evaluation, maintenance, or construction activity. The well log should include, but not be limited to:

a. A description of activity being conducted

b. The identification information for the well, including well number being tested

c. Date and time of each well maintenance or construction activity

d. Quantity of all materials used

e. Name, organization, and time of any personnel arriving or leaving the well site

4. Prior to beginning work on a project, the Contractor is to provide the Project Manager with a Safety Data Sheet (SDS) book for all chemicals used in the scope of this contract, including those used by subcontractors. The SDS book shall be kept up-to-date with new SDS sheets added as new materials are used.

Equipment and Personnel:

1. Equipment, including but not limited to: drilling tools, cameras and geophysical instruments, shall be properly cleaned before commencing work to minimize the potential for contamination of the borehole and well materials, and will be inspected and approved by the Project Manager prior to the equipment being used for the first time on any project.

Safety:

1. Contractor is responsible for all safety as it pertains to the services requested under this contract, including that of the rig, support equipment and Contractor personnel and observers at all times.

2. All drilling and construction activities necessitated by work under this contract are to be performed in accordance with all applicable OSHA requirements and local fire codes.

3. For drilling activities, the level of protection is modified Level D (per 29 CFR 1910.120), requiring the Contractor’s personnel to be outfitted with the following: hard hat, eye protection (safety goggles or safety glasses), hearing protection, hand protection (gloves), and protective footwear (steel-toed rubber boots). County reserves the right to refuse access to any of the Contractor’s personnel not complying with the requirements.

4. Contractor shall abide by all safety rules and regulations issued by the County, NFPA, OSHA and other regulatory agencies. Precautions must be exercised by the Contractor, at all times, for the protection of all persons, including employees and property.

5. The Contractor shall comply with all laws, regulations or ordinances related to safety and health, and make special effort to detect hazardous conditions and take prompt action where loss control/safety measures should reasonably be expected.

6. County reserves the right to order work stopped if conditions exist that present immediate danger to persons or property. Contractor acknowledges that such stoppage will not shift responsibility for any damages from Contractor to County.

Mobilization and Clean-up:

1. Contractor shall notify the Project Manager at least five (5) Calendar Days prior to mobilization onto a site and commencement of any drilling activities. The cost for mobilization shall include the cost of bonds and insurance, consideration for indemnification to the County, and any other overhead expenses necessary to carry out the Work under each section.

2. The Contractor shall move in and move out all necessary personnel and equipment, set-up and remove drilling rigs, equipment and temporary facility, perform all site clearing and grubbing, and remove all remaining debris, unused materials and other miscellaneous items resulting from or used in performance of the work.

3. All formation cuttings and material waste shall be contained in Contractor-provided Florida Department of Transportation (FDOT)-approved roll-off structures or approved equivalent to minimize adverse impacts to the environment at the drill site, consistent with applicable laws and regulations.

4. Discharge water during drilling and testing operations to be directed to a location approved by the Project Manager.

5. Contractor must keep the worksite free, at all times, from accumulation of waste materials and rubbish resulting from the work. At completion of work, Contractor shall restore the worksite to its prior condition.

6. Any spill of fuel, hydraulic fluid, or oil shall be immediately contained and any contaminated soil and/or refuse shall be immediately excavated, and property containerized. The contained materials shall be removed from the site and properly disposed of in an environmentally sound manner consistent with applicable federal, state and local regulations.

Aboveground and Underground Obstacles:

1. Contractor shall excavate not less than four (4) feet below land surface to check for obstructions (such as buried utilities) prior to commencement of drilling activities. The excavation must be at least as wide as the widest drill bit or auger used for well installation.

3. Contractor must provide a written statement to the Project Manager prior to commencement of any drilling activities indicating the results of the utility search.

Electricity:

1. Electricity may not be available on site. Contractor is responsible for providing all power to perform and complete the Work.

2. Contractor must notify the Project Manager a minimum of forty-eight (48) hours prior to any electrical isolation of a well.

3. Coordination with the local power company is the responsibility of the Contractor.

Boundaries of Work Ingress and Egress:

1. Rights-of-way for the worksites may or may not have been cleared through easements or permits and suitable provisions for ingress and egress. Contractor shall not enter or occupy with any persons, tools, equipment or materials, any ground outside of permissible boundaries specified by the Project Manager without written consent of the Project Manager.

2. Contractor shall obtain a key for County locks or other means of access prior to initiation of services from the Project Manager.

3. Contractor is responsible for locking all gates accessed while performing these services.

Plumbness and Alignment:

1. Stabilizers shall be used during drilling and the borehole shall be drilled as near to plumb and true as possible so a proper casing alignment and cement seal is achieved. If the Project Manager finds reasonable doubt in regard to the plumbness of the well, Contractor shall perform a plumbness test, at its own expense.

2. Plumbness is to be checked by lowering a four (4) foot long slug, one quarter (1/4) inch smaller than the inside diameter of the casing. The Project Manager reserves the right to reject a well installed out of plumb.

Materials:

Materials used for construction or modification of wells must meet the following requirements:

1. Water, and Additives:

A. Water for drilling, cleaning and other necessary field activities may not be available at the site. Contractor is responsible for obtaining and transporting all contaminant-free water to the drilling areas for required use. The source of such water shall be made known to the Project Manager for collection of a water-quality sample, if deemed necessary.

B. Drilling fluids and additives must be specifically recommended by the manufacturer for use in potable well drilling, when applicable. Contractor shall review fluids and additives with the Project Manager prior to commencement of drilling.

C. Contractor is responsible for preventing contamination of samples of the aquifer and shall not introduce mud, clay, or other drilling additives into the well.

D. All material utilized to stop circulation loses must be approved first by the Project Manager prior to use.

2. Well Casing and Centralizers A. All well casings shall be new and free of defects and meet industry standards for materials used in construction.

PVC casing used for construction of monitoring wells shall meet ASTM F480, or equivalent AWWA or NSF standards.

B. Several lengths of casing should be available to allow for variance of the final depth of each well.

C. Only threaded PVC casing shall be used for construction of monitoring wells, unless otherwise agreed with the

Project Manager.

D. Casing centralizers shall be 0.25- inch minimum thickness steel, and of a size and shape such that, when attached to the casing, will effectively center the casing and assure sufficient space for a proper grout seal.

E. Casing centralizers shall be provided such that the size, shape, and positioning do not limit access of tremie pipes and other necessary tools in the annulus.

3. Cement A. Cement used for grouting in the casing in the well must be neat cement grout (ASTM C-150, Type I, Class A

Portland cement mixed with no more than six (6) gallons of water per ninety-four (94) pound bag of cement).

B. Any additives which the Contractor includes in the grout mixture must be pre-approved by the Project Manager.

4. Bentonite

A. Any bentonite used for well construction or abandonment must be industry standard and pre-approved by the Project Manager.

D1. WELL MAINTENANCE

Regularly scheduled annual maintenance of nine augmentation wells at the Cross Bar/Al Bar Ranch property over a 60-month period. This work will commence upon issuance of a Notice to Proceed from the County Project Manager to the Contractor.

1. General information, directions to the site and an approved time period for completion of the inspection will be provided to the Contractor at that time.

2. Semi-annual maintenance should be scheduled for May and November due to seasonal flooding and Contractor to provide notice of site visits at least two (2) weeks prior to such visit. County may accompany Contractor on site visits, at County’s discretion.

3. Mobilization to the site including delivery and set up of any other equipment necessary to perform the maintenance.

4. Cleaning, testing, and diagnosing the electrical programmed logic control panel (PLC).

a. Electrical contacts shall be cleaned and tested, and unit vacuumed free of debris.

5. Testing the submersible pump for proper operation within factory established parameters.

6. Submission of a summary reporting providing a description of the work performed on each well and recommended actions within ten (10) business days of completion of work.

Measurement and Payment:

Payment shall be made at the completion of semi-annual well maintenance for all nine (9) wells. Payment will include mobilization; Clean, Test, and Diagnose 9 PLCs and Pumps; Testing of submersible pump; and Detailed Summary Report. Unit of Measure is “Each” for all the Pay Items under Section D1.

D2. WELL EVALUATION SERVICES

This work will be scheduled with the Contractor as needed by the Project Manager.

i. General information, directions to the site and an approved time period for completion of the inspection will be provided to the Contractor at that time.

ii. Contractor will have ten (10) business days from receipt of the Work Assignment to complete the well evaluation.

iii. On an emergency basis, Contractor may be required to complete the well evaluation within forty-eight (48) hours of receipt of the Work Assignment.

1. Mobilization to the site including delivery and set up of crane truck, temporary pump, discharge line and any other equipment necessary to perform the evaluation.

2. Average well size is eight (8) inch diameter well with a total depth of four hundred (400) feet.

3. Evaluation of the entire well system including testing of PLC, analysis of electric controls, testing of pumping equipment and the site-specific hydro-geologic conditions.

a. Analysis of the electrical controls. Contractor is responsible for electrical isolation of each well (i.e., fuse jack pulling/lockout/tag-out). Contractor must notify the Project Manager a minimum of forty-eight (48) hours prior to the electrical isolation of a well. Any coordination with the local power company is the responsibility of the Contractor.

4. Performing removal and reinstallation of the pump, motor and appurtenances.

a. Contractor to remove the well head and pump column from the well, assess the physical condition of the pump and provide notes and digital pictures of the pump equipment to the Project Manager

b. Once pump is removed, the well, pump column and discharge piping are to be secured so that trash, dirt, debris, animals, etc. cannot enter the well, pump column or discharge pipe. After the specified testing is completed, discharge piping is to be reinstalled.

c. After reinstallation of the pump, a four (4) hour specific capacity test shall be performed, if requested. Contractor will be required to connect up to five hundred (500) feet of temporary discharge line to the well head, if necessary, equipped with a calibrated flow meter and a diffuser at the end to prevent erosion. Water must be discharged away from the well to a location as directed by the Project Manager, and so there is no ponding water around the well or erosion to the discharge area. The discharge line shall remain in place until the successful completion of the required bacteriological clearance sampling.

5. Submission of a brief summary reporting providing a description of the work performed on each well and recommended actions within ten (10) business days of completion of work.

Downhole Video Logging If requested by Project Manager:

1. Contractor is to provide qualified personnel and equipment to run a downhole video survey from land surface to the total depth of the well.

2. County reserves the right to have staff and/or a consultant onsite during the downhole video survey.

3. If cloudy conditions are encountered in the well during the downhole video survey, Contractor may be required to run additional development pumping. Any alternate procedures require approval from the Project Manager.

4. The downhole camera shall be solid state and have a resolution of at least four hundred fifty (450) horizontal lines, color capability and come equipped with a minimum 3.5mm wide angle lens (100”) and a 1.8 fixed iris.

a. Camera housing should be stainless steel, waterproof and rated at one thousand six hundred fifty (1,650) feet or greater maximum working depth.

b. Camera should be equipped with sufficient cable and a sufficient light source, as well as a winch, footage counter, tripod and mounting head. (The footage counter shall be accurate and calibrated prior to approval at the site).

5. All downhole video equipment must meet with approval of the Project Manager.

6. Contractor must provide one (1) copy of the video on a CD ROM or DVD on the day of the survey, with two (2) additional copies within seven (7) business days of completion of work at each well. The video file format must meet with industry standards and approved by the Project Manager.

Specific Capacity Test

1. An eight (8) hour specific capacity test may need to be performed on a well. Contractor shall furnish, install, operate, maintain and remove a pumping unit capable of producing six hundred (600) gpm and furnish power for this unit for the duration of the pumping test.

2. The equipment must be installed so County has adequate access to the borehole for water level measurements.

3. Up to five hundred (500) feet of adequately sized discharge line equipped with a diffuser to prevent erosion, and a calibrated flow meter must be supplied and installed by the Contractor to direct the water discharge away from the well to a location approved by the Project Manager. Water must be discharged away from the well to a location as directed by the Project Manager, and so there is no ponding water around the well or erosion to the discharge area.

4. Contractor may be directed to perform additional drilling or other work on the well if the production capacity of the well is less than fifty (50) gallons per minute per foot of drawdown (gpm/ft).

D3. WELL DEEPENING

i. General information, directions to the site and an approved time period for completion of the inspection will be provided to the Contractor at that time.

ii. Contractor will have twenty (20) business days from receipt of the Work Assignment to complete the well deepening activities unless otherwise agreed to by Project Manager.

Work includes:

1. Mobilization to the site, including delivery and set up of equipment necessary to perform services.

2. Assuming an existing eight (8) inch diameter augmentation well, cased to a depth of one hundred fifty (150) feet with an open borehole to four hundred (400) feet. (Actual diameters and depths will be determined on a site-specific basis).

3. A nominal six (6) inch diameter borehole is to be drilled from the existing bottom of the borehole, four hundred (400) feet below land surface to approximately seven hundred (700) feet below land surface using the reverse drilling method.

4. Contractor shall use an approved rotary rig equipped for reverse air methods of drilling for the drilling of the open borehole.

5. Contractor shall collect formation samples at five (5) foot intervals from the bottom of the borehole to approximately seven hundred (700) feet below land surface. These samples may be collected from the surface returns during the drilling process.

6. Contractor shall collect water samples from the borehole every fifty (50) feet advanced by the drill stem, and those samples are to be analyzed for the field parameters pH, conductivity and temperature. Field analyses of the surface returns shall be performed by the County or County’s consultant.

7. Contractor shall perform a specific capacity test at fifty (50) feet intervals from the original borehole depth of seven hundred (700) feet below land surface in the well during reverse air drilling. Contractor is to stop the reverse air discharge until a static water level is obtained by the County or County’s consultant. The reverse air discharge will then be run for approximately ten (10) to fifteen (15) minutes while the County or County’s consultant measures pumping water levels. Contractor shall provide the means of measuring the volume and rate of reverse air discharge.

8. Includes removal and reinstallation of the well house (where appropriate). When well house is removed, all electrical equipment shall be protected from the weather. Well house doors must be aligned and swing freely when reinstalled. Any painted areas that are damaged shall be repainted, as directed.

9. Removal and reinstallation of the pump, motor and appurtenances. Contractor to remove the well head and pump column from the well, assess the physical condition of the pump and provide notes and digital pictures of the pump equipment to the Project Manager.

1. Once pump is removed, the well, pump column and discharge piping are to be secured so that trash, dirt, debris, animals, etc. cannot enter the well, pump column or discharge pipe. After the specified testing is completed, discharge piping is to be reinstalled

2. Contractor is responsible for electrical isolation of each well (i.e., fuse jack pulling/lockout/tag-out). Contractor must notify the Project Manager a minimum of forty-eight (48) hours prior to the electrical isolation of a well.

Any coordination with the local power company is the responsibility of the Contractor.

10. The well shall be developed by first pumping at the highest rate obtainable until the discharged water is essentially free of suspended solids. The well must then be alternately pumped and surged with an approved airlift pumping system to effectively agitate and clean the open borehole. The airlift system’s eductor pipe opening is to be placed are various levels within the borehole to concentrate the development action. Pumping and surging are to be continued until all areas of the well yield water free of sand, cuttings and suspended solids, as determined by the Project Manager or County’s consultant.

Geophysical Logging:

1. Contractor shall provide documentation of the quality assurance and quality control procedures of the proposed geophysical logging operation to the Project Manager for approval prior to starting the work.

2. Contractor is to provide staff and equipment to run a suite of geophysical logs from land surface to the total depth of the well.

a. Gamma ray logs should be run from the bottom of the borehole to land surface

b. Logs run in the static mode are to include video, caliper, gamma, electric, temperature, fluid resistivity, and flow meter.

c. Geophysical logs run in the pumping mode are to include: flow meter, fluid resistivity, and temperature.

3. Contractor is to furnish and temporarily install a submersible pump capable of evacuating water from a borehole at a rate that sufficiently stresses the aquifer to run flow logs (estimated to range from 100 gpm for an upper Floridan aquifer monitoring well to 1,500 gpm for a large production well), including a means to control flow rates and to accurately measure variability of flow.

4. Contractor must furnish manpower to run the pump and provide up to five hundred (500) feet of discharge piping.

A diffuser must be placed at the end of the temporary piping to reduce erosion.

5. Contractor is to ensure that borehole-logging instruments and equipment used to make each log are in good condition, and capable of producing an accurate and representative log.

6. Contractor shall calibrate all logging tools, with the exception of the flow tool, with standards corresponding to anticipated measurements prior to introducing them into the borehole, and to check them with the same standards upon removal from the borehole.

7. Contractor shall provide results of field standard checks made before and after each log run on the log printout.

8. The flow meter shall be calibrated while the tool is inside the casing or open borehole.

9. Contractor must ensure that all logs are recorded at the highest sensitivity that is consistent with a minimum of off-scale deflection, and ensure that scales, calibration, standardization, and other pertinent data are recorded on each log.

10. Contractor is to provide three (3) copies of the borehole geophysical logs to the Project Manager within five (5) business days following completion of the onsite activities.

D4. WELL CLEARING SERVICES

This work will be scheduled with the Contractor as needed by the Project Manager,

i. General information, directions to the site and an approved time period for completion of the inspection will be provided to the Contractor at that time.

ii. Contractor will have twenty (20) business days from receipt of the Work Assignment to complete the well clearing activities unless otherwise agreed to by Project Manager.

iii. On an emergency basis, Contractor may be required to complete the well clearing within three ((3) business days of receipt of the Work Assignment.

Work includes:

1. Mobilization to the site, including delivery and set up of equipment necessary to perform services

2. Assuming an existing eight (8) inch diameter supply well, with a total depth of four hundred (400) feet. (Actual diameters and depths will be determined on a site-specific basis)

3. Removal and reinstallation of the well house (where appropriate). When well house is removed, all electrical equipment shall be protected from the weather. Well house doors must be aligned and swing freely when reinstalled. Any painted areas that are damaged shall be repainted, as directed.

4. Removal and reinstallation of the pump, motor and appurtenances. Contractor to remove the well head and pump column from the well, assess the physical condition of the pump and provide notes and digital pictures of the pump equipment to the Project Manager.

a. Once pump is removed, the well, pump column and discharge piping are to be secured so that trash, dirt, debris, animals, etc. cannot enter the well, pump column or discharge pipe. After the specified testing is completed, discharge piping is to be reinstalled

b. Contractor is responsible for electrical isolation of each well (i.e., fuse jack pulling/lockout/tag-out). Contractor must notify the Project Manager a minimum of forty-eight (48) hours prior to the electrical isolation of a well.

Any coordination with the local power company is the responsibility of the Contractor.

5. The well shall be cleared from the top of casing to total depth with an eight (8) inch nominal diameter drill bit.

Contractor shall drill and/or develop out the rocks and sediment to the specified total depth of the well.

6. After reinstallation of the pump, Contractor shall develop the well for four (4) hours by connecting up to five hundred

(500) feet of temporary discharge line to the well head, if necessary, equipped with a diffuser at the end to prevent erosion. Water must be discharged away from the well to a location as directed by the Project Manager, and so there is no ponding water around the well or erosion to the discharge area.

D5. WELL BACK-PLUGGING SERVICES

i. General information, directions to the site and an approved time period for completion of the inspection will be provided to the Contractor at that time.

ii. Contractor will have thirty (30) business days from receipt of the Work Assignment to complete the well back-plugging activities unless otherwise agreed to by Project Manager.

iii. On an emergency basis, Contractor may be required to complete the well back-plugging within ten (10) days of receipt of the Work Assignment.

Well Back-Plugging:

1. Wells are to be abandoned in accordance with Chapter 40D-3 F.A.C.

2. Mobilization to the site, including delivery and set-up of equipment necessary to perform services.

3. Assuming an existing eight (8) inch diameter supply well, with a total depth of four hundred (400) feet. (Actual diameters and depths will be determined on a site-specific basis)

4. Removal and reinstallation of the well house (where appropriate). When well house is removed, all electrical equipment shall be protected from the weather. Well house doors must be aligned and swing freely when reinstalled. Any painted areas that are damaged shall be repainted, as directed.

5. Removal and reinstallation of the pump, motor and appurtenances. Contractor to remove the well head and pump column from the well, assess the physical condition of the pump and provide notes and digital pictures of the pump equipment to the Project Manager.

a. Once pump is removed, the well, pump column and discharge piping are to be secured so that trash, dirt, debris, animals, etc. cannot enter the well, pump column or discharge pipe. After the specified testing is completed, discharge piping is to be reinstalled

b. Contractor is responsible for electrical isolation of each well (i.e., fuse jack pulling/lockout/tag-out). Contractor must notify the Project Manager a minimum of forty-eight (48) hours prior to the electrical isolation of a well.

Coordination with the local power company is the responsibility of the Contractor.

6. The bottom fifty (50) feet of the well must be back plugged with bentonite chips. The Contractor shall verify the depth to the top of bentonite by sounding prior to emplacement of neat cement grout. Upon verification of a five

(5) foot grout plug shall be emplaced via tremie pipe. Alternate methodologies for back-plugging require prior approval from the Project Manager.

7. A specific capacity test will be conducted on the well after reinstallation of the production pumping equipment. The test is expected to run approximately four (4) hours to demonstrate the well can produce an adequate amount of water to augment the wetland(s) it services.

D6. WELL REHABILITATION CHEMICAL TREATMENT

i. General information, directions to the site and an approved time period for completion of the inspection will be provided to the Contractor at that time.

1. Mobilization to the site, including delivery and set-up of equipment necessary to perform services.

2. Assuming an existing eight (8) inch diameter augmentation supply well, with a total depth of four hundred (400) feet, constructed with one hundred (100) feet of casing. (Actual diameters and depths will be determined on a site-specific basis)

3. County may request Contractor perform acid treatment of water supply production wells or reclaimed water recharge/injection wells; therefore, the method of injection may change dependent upon several factors including, but not limited to, type of well, available ports on the well head, and known information about the formation.

4. Removal and reinstallation of the pump, motor and appurtenances. Contractor to remove the well head and pump column from the well, assess the physical condition of the pump and provide notes and digital pictures of the pump equipment to the Project Manager.

a. Once pump is removed, the well, pump column and discharge piping are to be secured so that trash, dirt, debris, animals, etc. cannot enter the well, pump column or discharge pipe. After the specified testing is completed, discharge piping is to be reinstalled

b. Contractor is responsible for electrical isolation of each well (i.e., fuse jack pulling/lockout/tag-out). Contractor must notify the Project Manager a minimum of forty-eight (48) hours prior to the electrical isolation of a well.

Any coordination with the local power company is the responsibility of the Contractor.

5. Treatment will entail the injection of appropriate/calculated quantities of acid into the well casing and borehole in order to ensure the acid reaches all areas of the formation with sufficient strength to conduct the desired level of remediation.

6. After a suitable amount of time (twenty-four (24) hours minimum) has been allowed for the acid to complete remediation, if the pH of the well water has not risen to a minimum of 6.5, Contractor will conduct pH adjustment.

7. Airlifting will be conducted with a steel pipe (minimum two (2) inch diameter) and will be done at depths where the formation is deemed stable enough to handle aggressive airlifting (meaning “blowing the well” as opposed to “boiling it over”). Airlifting will be considered complete once the well no longer shows signs of loose bacteria and debris in the discharge water. Airlift water will be piped/directed away from the well head, into a suitable “energy dissipation structure” to be approved by the Project Manager. The “energy dissipation structure” is intended to facilitate pH adjustment, as needed. Airlifting will be conducted for +/- three (3) hours.

D7. WELL REPAIR SERVICES

i. General information, directions to the site and an approved time period for completion of the inspection will be provided to the Contractor at that time.

1. Contractor is to provide a site visit and submit a written quotation for electrical, mechanical and miscellaneous repairs and/or parts required on existing wells and equipment to the Project Manager.

a. Site visit evaluation is to be between the hours of 8:00 a.m. and 5:00 p.m. EST, Monday through Friday.

b. Contractor is to respond within two (2) hours of notification and may charge a one (1) hour minimum call-out under Standard Labor hours for billing.

2. Emergency or after-hours repairs must be scheduled directly with the Project Manager.

a. Contractor shall respond within two (2) hours of notification and may charge a two (2) hour minimum call-out under Emergency/After-Hours Labor for billing.

3. All repair/replacement well pump parts shall be of major branding and must be approved by the Project Manager.

a. Parts exceeding the threshold of $5,000 will require Contractor submission of three (3) quotes from different providers, or documentation of Manufacturer’s Standard Retail Price. Contractor is to ensure all quotes are competitive and must attempt to obtain the best possible pricing consistent with these specifications.

4. All pumps must be available in single and three phase power up to fifteen (15) horsepower installed in wells up to eight hundred (800) feet in depth.

5. Replacement of non-warrantied parts will be at actual cost. Replacement of warrantied parts are to be reflected on Contractor’s invoice at “no charge.”

D8. MONITORING WELL CONSTRUCTION

This work will be scheduled with the Contractor as needed by the Project Manager

i. General information, directions to the site and an approved time period for completion of the inspection will be provided to the Contractor at that time.

ii. Contractor will have twenty (20) business days from receipt of the Work Assignment to complete the monitoring well construction activities unless otherwise agreed to by Project Manager.

A. Surficial Aquifer Monitoring Well Construction:

1. Mobilization to the site, including delivery and set up of equipment necessary to perform services.

2. Assuming a two (2) inch PVC well with a total depth of twenty (20) feet equipped with ten (10) feet of 0.01 slotted screen. (Actual depths and construction details will be determined on a site-specific basis)

3. Contractor is to set up to obtain the subsurface lithology utilizing a five (5) foot macro core device equipped with clear plastic sleeves.

a. The macro core device should be vibrated in five (5) foot intervals to a minimum of the total depth of the well.

b. Each sleeve shall be split with a razor tool, and the cored material laid out for the Project Manager or County’s consultant to properly record and classify.

4. Once the macro core lithology has been completed, Contractor is to drill a nominal six point seven five (6.75) inch diameter borehole to a depth of twenty (20) feet using the hollow stem auger method of well drilling.

5. Once the hollow stem flights have been advanced to the total depth of the well, Contractor will insert and align into the flights the appropriate length of two (2) inch diameter, Schedule 40 PVC well casing, equipped ten (10) feet of two (2) inch diameter, Schedule 40 PVC, 0.010 inch slotted well screen at the bottom.

a. The well screen and casing string are to extend approximately thirty-six (36) inches above land surface.

b. The PVC casing and screen section shall be connected by threaded couplings.

c. The screen will be filter-packed with a washed, well-rounded 20/30 silica sand and emplaced by the tremie method from the bottom of the borehole to a level approximately two (2) feet above the top of screen interval.

d. After the filter pack has settled, a one (1) foot fine sand cap will be tremied in on top of the filter pack.

e. Type I Class A cement grout will be installed by the tremie method from the top of the fine sand cap to just below land surface.

6. The well is to be developed by alternately pumping and surfing using a centrifugal pump to effectively agitate and clean the well screen area. Pumping and surging will continue until the well yield water free of sand and silt, and turbidity readings are below twenty (20) Nephelometric Turbidity Units (NTU).

a. The well should be developed for +/- two (2) hours or until complete.

7. The two (2) inch diameter PVC casing extending above the top of the pad approximately thirty-six (36) inches should have a six (6) inch diameter round aluminum lockable protective well cover installed and centered on the outside of the two (2) inch PVC well casing approximately thirty-eight (38) inches above the top of the pad.

a. The well cover should be encased into a two (2) foot by two (2) foot by four (4) inch minimally sloped concrete surface pad with a well identification number affixed to the well cover in a permanent manner.

b. County will provide a Master lock for Contractor to lock the well cover.

8. Three (3) fifty-two (52) inch long and four (4) inch diameter steel bollards may be required to be installed surrounding the well head, upon direction of the Project Manager.

a. Each bollard shall be set eighteen (18) inches into the ground and approximately forty-eight to fifty (48-50) inches part in a triangular pattern.

b. Each bollard must be tied together with a three (3) inch by half (1/2) inch thick steel plates welded to the outside of the bollards.

c. Each bollard must be filled to the top with concrete.

d. The bollard system must be painted with a safety yellow oil or epoxy-based paint.

9. In some situations, and with pre-approval of PCU staff, one (1) inch PVC pre-packed screen micro wells installed utilizing direct push technology will be acceptable. Well construction depths and details will be determined on a site-specific basis.

B. Shallow Upper Floridan Aquifer Monitoring Well Construction:

1. Mobilization to the site, including delivery and set up of equipment necessary to perform services. Contractor to use a mud rotary and reverse air method of drilling for installation of the well.

2. Assuming a four (4) inch diameter PVC well with a total depth of one hundred (100) feet, with twenty (20) feet of screen. (Actual depths and construction details will be determined on a site-specific basis)

3. Advance the split spoon sampler to the top of limestone or to the depth of refusal (assumed to be forty (40) feet below land surface) in order to obtain lithology of the subsurface.

a. Spoon samples to be collected every five (5) feet.

4. A ten (10) inch diameter borehole is to be drilled with mud rotary drilling from land surface until a competent confining clay layer is encountered (estimated at forty (40) foot below land surface).

5. Contractor is to provide, and install, an eight (8) inch PVC surface casing to the end depth.

a. The annular space around the surface casing is to be filled with neat cement grout using the tremie pipe method and the grout allowed to cure for an adequate period of time, minimum twenty-four (24) hours.

6. Once the grout seal around the surface casing has cured adequately per approval of the Project Manager, the surface casing will be drilled out and the bore hole will be drilled using a six (6) inch diameter nominal drill bit to a depth of approximately one hundred (100) feet below land surface using the mud rotary or reverse-air method of drilling, as required.

7. In some situations, and with pre-approval of PCU staff, sonic drilling methodology will be acceptable. Well construction depths and details will be determined on a site-specific basis.

8. Two (2) inch diameter PVC well casing, with ten (10) feet of 0.010 slot well screen at the bottom, is to be installed to an approximate depth of one hundred (100) feet below land surface.

a. An adequate amount of 20/30 silica sand is to be placed as a filter pack over the entire screened interval via tremie pipe from the bottom of the hole to one (1) foot over the top of screen.

b. A two (2) foot cap of fine 6/20 sand is to be placed on top of the filter pack, via tremie pipe, and the remainder of the borehole filled with a bentonite grout mixture.

c. Any deviation from this protocol requires approval of the Project Manager.

9. The two (2) inch diameter PVC casing extending above the top of the pad approximately thirty-two (32) inches should have a six (6) inch diameter round aluminum lockable protective well cover installed and centered on the outside of the two (2) inch PVC well casing approximately thirty-six (36) inches above land surface.

a. The well cover should be encased into a two (2) foot by two (2) foot by four (4) inch sloped concrete surface pad with a well identification number affixed to the well cover in a permanent manner.

b. A stencil and black spray paint can be utilized for the well identification.

10. The well is to be developed by alternately pumping and surging using a centrifugal pump to effectively agitate and clean the well screen area.

a. Pumping and surging will continue until the well yields clean water free of sand and silt and turbidity readings are below twenty (20) NTU.

b. The well should be developed for +/- two (2) hours or until complete.

11. Three (3) fifty-two (52) inch long and four (4) inch diameter steel bollards may be required to be installed surrounding the well head, upon direction of the Project Manager.

a. Each bollard shall be set eighteen (18) inches into the ground and approximately forty-eight to fifty (48-50) inches part in a triangular pattern.

b. Each bollard must be tied together with a three (3) inch by half (1/2) inch thick steel plates welded to the outside of the bollards.

c. Each bollard must be filled to the top with concrete.

d. The bollard system must be painted with a safety yellow oil or epoxy-based paint.

Supply Well Construction:

This work will be scheduled with the Contractor periodically by the Project Manager Projects include new irrigation supply, private potable water supply or wetland augmentation supply wells.

i. General information, directions to the site and an approved time period for completion of the inspection will be provided to the Contractor at that time.

ii. Contractor will have twenty (20) business days from receipt of the Work Assignment to complete the supply well construction unless otherwise agreed to by Project Manager.

C. Four (4) inch Diameter Irrigation Supply Well:

1. Mobilization to the site, including delivery and set up of equipment necessary to perform services. Contractor to use an approved rotary rig equipped for mud rotary drilling for installing this well.

2. Assuming a four (4) inch diameter with one hundred (100) feet of casing and a total depth of two hundred (200) feet. (Actual depths and construction details will be determined on a site-specific basis)

3. Contractor is to drill an eight (8) inch borehole and install the four (4) inch PVC casing to a depth of one hundred feet below land surface.

a. The annular space around the four (4) inch PVC casing is to be filled with neat cement grout using the tremie method and the grout allowed to cure for an adequate period of time (minimum twenty-four (24) hours).

4. Once the grout seal around the surface casing has cured adequately per approval of the Project Manager, the surface casing will be drilled out and the borehole will be drilled using a three (3) inch diameter nominal drill bit to a depth of approximately two hundred (200) feet below land surface using the mud rotary or reverse-air method of drilling, as required.

5. Once the well drilling has been completed, Contractor is to install and appropriately sized and designed pump assembly to meet the needs of the site’s irrigation supply system. Contractor is to also include a new well pad, install a new pressure tank, and all piping connections.

6. The well is to be developed until the well yield water free of sand and silt, and turbidity readings are below twenty

(20) NTU.

a. The well should be developed for +/- two (2) hours or until complete.

D. Four (4) inch Diameter Private Potable Supply Well:

1. Mobilization to the site, including delivery and set up of equipment necessary to perform services. Contractor to use an approved rotary rig equipped for mud rotary and reverse air methods of drilling for installing this well.

2. Assuming a four (4) inch diameter with one hundred fifty (150) feet of casing and a total depth of three hundred

(300) feet. (Actual depths and construction details will be determined on a site-specific basis)

3. Contractor is to drill an eight (8) inch diameter borehole to a depth of one hundred fifty (150) feet below land surface.

a. The annular space around the four (4) inch PVC casing is to be filled with neat cement grout using the tremie method and the grout allowed to cure for an adequate period of time (minimum twenty-four (24) hours).

4. Once the grout seal around the surface casing has cured adequately per approval of the Project Manager, the surface casing will be drilled out and the borehole will be drilled using a three (3) inch diameter nominal drill bit to a depth of approximately three hundred (300) feet below land surface using the mud rotary or reverse-air method of drilling, as required.

5. Once the well drilling has been completed, Contractor is to install and appropriately sized and designed pump assembly to meet the needs of the site’s potable supply system. Contractor is to also include a new well pad, install a new pressure regulating tank, and all piping connections.

6. The well is to be developed until the well yield water free of sand and silt, and turbidity readings are below twenty

(20) NTU.

a. The well should be developed for +/- two (2) hours or until complete.

7. The well is to be disinfected with a calcium…