Section_33_11_13_-_Water_Supply_Well_0006.pdf

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SLBE 318729 WATER SUPPLY WELLS

SECTION 33 11 13

WATER SUPPLY WELLS

PART 1 – GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplemen-tary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 DESCRIPTION OF WORK

A. This Section includes the following:

1. Driven Drilled water supply wells.

2. Submersible well pumps.

3. Pressure Tanks

1.3 SUBMITTALS

A. Product Data: Submit certified performance curves and rated capacities of selected well pumps and furnished specialties and accessories for each type and size of well pump indicated.

B. Shop Drawings: Show layout and connections for well pumps.

1. Wiring Diagrams: Power, signal, and control wiring.

2. Setting Drawings: Include templates and directions for installing foundation bolts, anchor bolts, and other anchorages.

3. Project Record Documents: Record the following data for each water supply well:

a. Casings: Material, diameter, thickness, weight per foot of length, and depth below grade.

b. Screen: Material, construction, diameter, and opening size.

c. Pumping Test: Static water level, maximum safe yield, and drawdown at max-imum yield.

d. Log: Formation log indicating strata encountered.

e. Alignment: Certification that well is aligned and plumb within specified toler-ances.

C. Field quality-control reports, including the following:

1. Substrata formations.

2. Water-bearing formations.

3. Water levels.

4. Laboratory water analysis.

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5. Well-screen analysis.

6. Performance test data.

D. Operation and Maintenance Data: For each well pump to include in emergency, op-eration, and maintenance manuals.

1.4 QUALITY ASSURANCE

A. Well Driller Qualifications: An experienced water supply well driller licensed in the jurisdiction where Project is located.

B. If an independent testing agency is required, see Section 014000 "Quality Require-ments" for general testing and inspecting agency qualification requirements. If addi-tional control is needed, use first paragraph below to specify 29 CFR 1910.7 or other more specific criteria (e.g., NETA). 29 CFR 1910.7 defines a nationally recognized testing laboratory as it applies to testing and inspecting for safety, and lists, labels, or accepts equipment and materials that meet certain OSHA criteria.

C. Testing Agency Qualifications: An independent agency, with the experience and ca-pability to conduct the testing indicated, that is a nationally recognized testing labor-atory (NRTL) as defined by OSHA in 29 CFR 1910.7.

D. Electrical Components, Devices, and Accessories: Listed and labeled as defined in

NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdic-tion, and marked for intended use.

E. Comply with AWWA A100 for water supply wells.

1.5 PROJECT CONDITIONS

A. Interruption of Existing Water Service: Do not interrupt water service to facilities occupied by Contracting Officer or others unless permitted under the following con-ditions and then only after arranging to provide temporary water service according to requirements indicated:

1. Notify the Contracting Officer seven days in advance of proposed interruption of water service.

2. Do not proceed with interruption of water service without the Contracting Of-ficer’s written permission.

PART 2 – PRODUCTS

2.1 WELL CASINGS

A. Steel Casing: AWWA C200, single ply, steel pipe with threaded ends and threaded couplings for threaded joints.

B. Retain one of first two paragraphs below. These specialties are designed for use with jet and submersible pumps. Pitless adapter is installed in casing. Pitless unit replaces a portion of casing.

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C. Pitless Adapter: Fitting, of shape required to fit onto casing, with waterproof seals.

D. Well Seals: Casing cap, with holes for piping and cables, that fits into top of casing and is removable, waterproof, and vermin proof.

2.2 WATER WELL SCREENS

A. Screen Material: Fabricated of ASTM A 666, Type 304 stainless steel tube; with slotted or perforated surface and designed for well-screen applications.

1. Screen Couplings: Butt-type, stainless-steel coupling rings.

2. Screen Fittings: Screen, with necessary fittings, closes bottom and makes tight seal between top of screen and well casing.

2.3 SUBMERSIBLE WELL PUMPS

A. Manufacturers: Subject to compliance with requirements, provide products by

Franklin Electric.

1. Description: Submersible, vertical-turbine well pump complying with HI 2.1-2.2 and HI 2.3; with the following features:

a. Column Pipe: ASTM A 53/A 53M, Schedule 40, galvanized-steel pipe with threaded ends and cast-iron or steel threaded couplings.

b. Discharge Piping: ASTM D 2239, SIDR Numbers 5.3, 7, or 9 PE pipe;

made with PE compound number required to give pressure rating not less than 160 psi.

c. Fittings for PE Pipe: ASTM D 2609, made of PA, PP, or PVC with serrated, male insert ends matching inside of pipe. Include bands or crimp rings.

2. Salient Characteristics

a. North Manitou Island – Franklin Electric Tri-Seal 4” High Capacity

90FH3S4-PE Submersible Well Pump

1) Physical

a) Body Material: Stainless Steel

b) Impeller Design: Floating Stack

c) Impeller Material: Glass-Filled Modified PPO

d) Discharge Size: 2” NPT

e) Motor Horsepower: 3 HP

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2) Functional

a) Nominal Flow Rating: 90 GPM

b) Maximum Capacity: 130 GPM

c) Maximum Head: 205 Feet

d) Stages: 7

e) Maximum Liquid Temperature: 120 °F / 49 °C

3) Performance

a) Manufacturer’s warranty of one (1) year from installation, but in no event more than two (2) years from the date of manufacture.

b. South Manitou Island Main Village – Franklin Electric Tri-Seal 4” High

Capacity 90FH5S4-PE Submersible Well Pump

1) Physical

a) Body Material: Stainless Steel

b) Impeller Design: Floating Stack

c) Impeller Material: Glass-Filled Modified PPO

d) Discharge Size: 2” NPT

e) Motor Horsepower: 5 HP

2) Functional

a) Nominal Flow Rating: 90 GPM

b) Maximum Capacity: 130 GPM

c) Maximum Head: 350 Feet

d) Stages: 12

e) Maximum Liquid Temperature: 120 °F / 49 °C

3) Performance

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a) Manufacturer’s warranty of one (1) year from installation, but in no event more than two (2) years from the date of manufacture.

c. South Manitou Island Chicago Road – Contractor to select pump that meets criteria listed below.

1) Physical

a) Body Material: Stainless Steel

b) Impeller Design: Floating Stack

c) Impeller Material: Glass-Filled Modified PPO

d) Discharge Size: 2” NPT

2) Functional

a) Nominal Flow Rating: 2.5 – 20 GPM

b) Maximum Capacity: 40 GPM

c) Maximum Liquid Temperature: 120 °F / 49 °C

3) Performance

a) Manufacturer’s warranty of one (1) year from installation, but in no event more than two (2) years from the date of manufacture.

2.4 PRESSURE TANKS

A. Manufacturers: Subject to compliance with requirements, provide products by

Amtrol.

1. Salient Characteristics

a. North and South Main Village – Amtrol WX-302 Pressure Tank

1) Physical

a) Shell Material: Steel

b) Diaphragm Material: Heavy Duty Butyl

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c) Liner Material: Virgin Polypropylene

d) Connection Size: 1-1/4”

e) Height: 47-1/4”

f) Diameter: 26”

g) Weight: 123 lbs

2) Functional

a) Tank Volume: 86 Gallons

b) Maximum Accept. Factor: 0.54

c) Precharged PSI: 38 psi

d) Maximum Pressure: 150 psi

e) Maximum Temperature: 200°F

3) Performance

a) Warranty: Seven (7) Year Limited

b. South Manitou Island Chicago Road – Amtrol WX-205 Pressure Tank

1) Physical

a) Shell Material: Steel

b) Diaphragm Material: Heavy Duty Butyl

c) Liner Material: Virgin Polypropylene

d) Connection Size: 1-1/4”

e) Height: 29-5/8”

f) Diameter: 22”

g) Weight: 61 lbs

2) Functional

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a) Tank Volume: 34 Gallons

b) Maximum Accept. Factor: 1.00

c) Precharged PSI: 38 psi

d) Maximum Pressure: 150 psi

e) Maximum Temperature: 200°F

3) Performance

a) Warranty: Seven (7) Year Limited

2.5 CHLORINATION SYSTEM

A. Manufacturers: Subject to compliance with requirements, provide products by

Dosatron.

1. Salient Characteristics

a. North Manitou Island Main Village, South Manitou Island Main Village, and South Manitou Island Chicago Road – Dosatron D132MZ30000

1) Physical

a) Dimensions: 25 11/16” W x 36 ¾” H x 8 13/16” D

b) Connection Size: 3” NPT

2) Functional

a) Percentage Range: 0.003% to 0.03%

b) Unit Weight: 33 lbs

c) Flow: 35.2 to 132 GPM

d) Pressure: 7 to 87 PSI

e) Ratio Range: 1:30,000 to 1:3,000

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3) Performance

a) Warranty: Manufacturer’s warranty of one (1) year from date of purchase by the original purchaser.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Construct well using rotary drilled method.

B. The minimum depth of the wells are to be 85 feet on South Manitou Island and 140 feet on North Manitou Island.

C. Take samples of substrata formation at 10-foot intervals and at changes in formation throughout entire depth of each water supply well.

D. The borehole shall be drilled at a location confirmed in the field and by a member of the

National Park Staff. Upon completion of drilling, the Contractor shall condition the borehole and take whatever steps are necessary to maintain and prevent collapse of the borehole prior to and during placement of the conductor casing and cement grout sanitary seal.

E. Set casing and liners round, plumb, and true to line.

F. When the drilling operation has been completed to the satisfaction of the District, the conductor casing shall be installed. The conductor casing shall extend to the ground surface, be held in plumb position and shall be placed on the bottom of the borehole.

G. All field joints shall be properly butt-welded to assure complete penetration during welding with a minimum of two passes. All joints shall be watertight. Special care shall be exercised to ensure that the casing is straight. All field welding shall be performed in accordance with American Welding Society Standards by a certified welder.

H. The pilot borehole shall be drilled from the bottom of the conductor casing to the specified depth and diameter (see provision supplement[s]). The final depth of the pilot borehole will be determined by the National Park Service as drilling proceeds. The

Contractor shall drill below the specified depth only if requested to do so in writing by the Park. The Contractor shall take all measures necessary to protect the borehole from caving or raveling.

I. Mix grout in proportions of 1 cu. ft. (0.03 cu. m) or a 94-lb (42.6-kg) sack of cement with 5 to 6 gal. (19 to 23 L) of water. Bentonite clay may be added in amounts of 3 to 5 lb/cu. ft. (1.4 to 2.3 kg/0.03 cu. m) for a 94-lb (42.6-kg) sack of cement. If bentonite clay is added, water may be increased to 6.5 gal./cu. ft. (25 L/0.03 cu. m) of cement.

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J. Place grout continuously, from bottom to top surface, to ensure filling of annular space in one operation. Do not perform other operations in well within 72 hours after grouting of casing. When quick-setting cement is used, this period may be reduced to 24 hours.

K. Provide permanent casing with temporary well cap. Install with top of casing 36 inches

(910 mm) above finished grade.

L. Develop wells to maximum yield per foot of drawdown.

1. Extract maximum practical quantity of sand, drill fluid, and other fine materials from water-bearing formation.

2. Avoid settlement and disturbance of strata above water-bearing formation.

3. Do not disturb sealing around well casings.

4. Continue developing wells until water contains no more than 2 ppm of sand by weight when pumped at maximum testing rate.

M. Install submersible well pumps according to HI 2.1-2.4 and provide access for periodic maintenance.

1. Before lowering permanent pump into well, lower a dummy pump that is slightly longer and wider than permanent pump to determine that permanent pump can be installed. Correct alignment problems.

2. Before lowering permanent pump into well, start pump to verify correct rotation.

3. Securely tighten discharge piping joints.

4. Locate line-shaft well pump near well bottom; locate motor above grade. Install driver plate to correctly align motor and pump.

5. Connect motor to submersible pump and locate near well bottom.

a. Connect power cable while connection points are dry and undamaged.

b. Do not damage the power cable during installation; use cable clamps that do not have sharp edges.

c. Install water-sealed surface plate that will support pump and piping.

3.2 CONNECTIONS

A. Piping installation requirements are specified in Section 221113 "Facility Water

Distribution Piping." Specified in section 221118 “Water Distribution System”.

Drawings indicate general arrangement of piping, fittings, and specialties.

1. Connect water distribution system in trench to well pipe at pitless adapter.

3.3 WELL ABANDONMENT

A. Comply with AWWA A100 when abandoning water supply wells. Fill and seal holes and casings and restore ground surface to finished grade.

B. Follow well-abandonment procedures of authorities having jurisdiction. Restore ground surface to finished grade.

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3.4 FIELD QUALITY CONTROL

A. Test Preparation: Clean water supply wells of foreign substances. Swab casings using alkalis, if necessary, to remove foreign substances.

B. Michigan’s Well Construction Code requires testing to demonstrate that the water is free from coliform bacteria before the well is put into service and that all new wells be disinfected with chlorine to kill bacteria that may have been introduced during construction.

C. Perform tests and inspections and prepare test reports.

D. Tests and Inspections:

1. Plumbness and Alignment Testing: Comply with AWWA A100.

2. Furnish samples of water-bearing formation to testing laboratory and well-screen manufacturer for mechanical sieve analysis.

3. Prepare reports on static level of ground water, level of water for various pumping rates, and depth to water-bearing strata.

4. Performance Test Preparation: Start well pump and adjust controls and pressure setting. Replace damaged and malfunctioning controls and equipment.

5. Performance Testing: Conduct final pumping tests after wells have been constructed, cleaned, and tested for plumbness and alignment.

a. Arrange to conduct tests, with seven days' advance notice, after test pump and auxiliary equipment have been installed. Note water-level elevations referred to for each assigned datum in wells.

b. Measure elevation to water level in wells.

c. Perform two bailer or air-ejection tests to determine expected yield. Test at depths with sufficient quantity of water to satisfy desired yields.

d. Test Pump: Variable capacity test pump with capacity equal to maximum expected yields at pressure equal to drawdown in wells, plus losses in pump columns and discharge pipes.

e. Start and adjust test pumps and equipment to required pumping rates.

f. Record readings of water levels in wells and pumping rates at 30-minute maximum intervals throughout 24-hour minimum period.

g. Record maximum yields when drawdown is 60 inches above top of suction screens after designated times.

h. Operate pumping units continuously for 8 hours after maximum drawdown is reached.

i. Record returning water levels in wells and plot curves of well recovery rates.

j. Remove sand, stones, and other foreign materials that may become deposited in wells after completing final tests.

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3.5 CLEANING

A. Disinfect water supply wells according to AWWA A100 and AWWA C654 before testing well pumps.

3.6 PROTECTION

A. Water Quality Protection: Prevent well contamination, including undesirable physical and chemical characteristics.

END OF SECTION 33 11 13