DIVISION 6 TECHNICAL SPECIFICATIONS MAIN STREET WELL PUMPING EQUIPMENT REPLACEMENT Soquel Creek Water District CWO 14-028

TABLE OF CONTENTS 1.0 PROJECT REQUIREMENTS ..............................................................................................1  1.1 GENERAL DESCRIPTION OF WORK ..............................................................................1  1.2 HOURS OF WORK ..............................................................................................................1  1.3 SCHEDULE .........................................................................................................................1  1.4 SAFETY................................................................................................................................1  1.5 MOBILIZATION/DEMOBILIZATION...............................................................................2  1.6 SITE CLEANLINESS .........................................................................................................2  1.7 CONTRACTOR QUALIFICATIONS..................................................................................2  1.8 APPLICABLE CODES ........................................................................................................3  1.9. REFERENCE STANDARDS .............................................................................................3  2.0 SUBMITTALS PROCEDURES ...........................................................................................3  2.1 SHOP DRAWINGS AND ENGINEERING DATA ............................................................3  2.1.01 General ........................................................................................................................3  2.1.02 Engineer's Review of Submittals ...............................................................................4  2.1.03 Resubmittal of Drawings and Data...........................................................................5  2.2 OPERATION AND MAINTENANCE DATA AND MANUALS .......................................5  3.0 GENERAL EQUIPMENT STIPULATIONS .....................................................................5  3.1 SCOPE ..................................................................................................................................5  3.2 COORDINATION ................................................................................................................6  3.3 MANUFACTURER'S EXPERIENCE ................................................................................6  3.4 WORKMANSHIP AND MATERIALS................................................................................6  3.5 LUBRICATION ...................................................................................................................6  3.6 PREPARATION FOR SHIPMENT ....................................................................................6  3.7 SHIPPING............................................................................................................................7  3.8 DELIVERY ...........................................................................................................................7  3.9 STORAGE ............................................................................................................................7  3.10 HANDLING .......................................................................................................................8  4.0 SUBMERSIBLE RAW WATER WELL PUMP AND MOTOR ........................................8  4.1 SCOPE ..................................................................................................................................8  4.2 GENERAL ............................................................................................................................8  4.2.01 General Equipment Stipulations ...............................................................................9  4.2.02 Power Supply ..............................................................................................................9  4.3 WARRANTY ........................................................................................................................9  4.4 LOCAL REPRESENTATION .............................................................................................9  4.5 SUBMITTALS......................................................................................................................9  4.6 SERVICE CONDITIONS ..................................................................................................10  4.7 PERFORMANCE AND DESIGN REQUIREMENTS .....................................................11  4.8 MATERIALS ......................................................................................................................11  4.9 PUMP CONSTRUCTION .................................................................................................13  4.9.01 Impellers and Bowls .................................................................................................13  i

4.9.02 Wearing Rings ..........................................................................................................13  4.9.03 Pump Column/Riser ................................................................................................13  4.9.04 Sounding Tube..........................................................................................................13  4.9.05 Inline Check Valve .....................................................................................................14  4.10 FABRICATION AND MANUFACTURE .......................................................................14  4.10.01 Painting...................................................................................................................14  4.10.02 Balance ....................................................................................................................14  4.11 ELECTRIC MOTOR ........................................................................................................14  4.12 POWER CABLE ..............................................................................................................15  4.13 CONTROLS .....................................................................................................................16  4.14. SHOP TESTS ...................................................................................................................16  5.0 EXECUTION ....................................................................................................................... 16  5-1. INSTALLATION ...............................................................................................................16  5.2 FINAL DISINFECTION ...................................................................................................17  5.3 INSTALLATION PERFORMANCE AND TESTING .....................................................17  5.3.01 Installation and Operation Check ...........................................................................17  5.3.02. Installation Supervision..........................................................................................18 

ii

DIVISION 6 TECHNICAL SPECIFICATIONS MAIN STREET WELL PUMPING EQUIPMENT REPLACEMENT Soquel Creek Water District CWO 14-028 1.0 PROJECT REQUIREMENTS 1.1 GENERAL DESCRIPTION OF WORK. The Work to be performed under these Contract Documents is generally described as furnishing and installing a new well pump and motor in an existing well. The existing pumping equipment will be removed from the well before the beginning of the Work. 1.2 HOURS OF WORK. Normal work hours are between 8:00 am and 5:00 pm Monday - Friday. Non-working days shall not be weekdays except for holidays. 1.3 SCHEDULE. The Main Street Well is a critical part of the District’s production system. The work shall be performed such that the time that the well is off-line is minimized. The Contractor shall work consecutive 8-hour business days to complete work as rapidly as possible. It is anticipated that work could be completed according to the following schedule: Business Days Days 1-5 Days 6-8 Days 9 and 11 Day 12 Day 13

Task Equipment submittals submitted to Owner (2.1.01, 2.1.03 and 4.5) Engineer’s review of submittals (2.1.02) (Not sequentially after Day 8 but after Equipment has been purchased and delivered) Mobilize to site, steam clean/pressure wash existing column pipe (if necessary), install pumping equipment per specifications, final disinfection of well (5.1 and 5.2) Flush well (5.2) (Not sequentially after Day 12 but after bacteriological testing shows the absence of total coliforms and the CDPH has authorized bringing the well online) Conduct installation check (5.3). Demobilize.

1.4 SAFETY. The Contractor shall take all necessary measures and observe all applicable laws and regulations of any public body having jurisdiction over the construction work to avoid injury to personnel, equipment, or existing 1

surface and underground utility facilities. Errors or omissions on these specifications shall not be construed to relieve the Contractor from his responsibility to protect all surfaces, underground pipes, conduits, cables, or other structures. The Contractor shall be responsible for initiating, maintaining, and supervising all safety precautions and programs in connection with the construction work. Every effort shall be made by the Contractor to minimize public disturbance and ensure the safety of the general public, District employees, and Contractor staff. 1.5 MOBILIZATION/DEMOBILIZATION. Mobilization includes the purchase of contract bonds as per the Contract Document, assembly, and transportation of all necessary tools, equipment, personnel, and materials to and from the work site to perform all work required under these specifications. It also includes the site work necessary to accommodate the equipment installation and operation, well disinfection, and all other work by the Contractor. For materials delivered to the job site but not yet incorporated in the work, 50 percent of the invoice amount for that material delivered in the current billing period, as evidenced by the invoice and shipping tags will be paid. Mobilization shall include installing any necessary security fences and signs and initiating traffic control. Demobilization shall include removal of all equipment, materials, and temporary facilities installed during all phases of the construction work. Contractor will be permitted to use available land belonging to Owner, on the Site, for site work and for storage of materials and equipment. Additional staging area shall be acquired by the Contractor if necessary. Payment for mobilization and demobilization will comply with Section 108.01 of the District’s Standard Specifications. 1.6 SITE CLEANLINESS. During the progress of construction, Contractor shall keep the premises in a neat and clean condition, and free from unsightly accumulation of rubbish on a daily basis. Upon completion of the Work, Contractor shall satisfactorily dispose of or remove from the vicinity of the construction sites all rubbish, unused materials, and all other equipment or materials belonging to the Contractor or used under Contractor’s direction during the construction. Site shall be cleaned and restored to the satisfaction of the Engineer. 1.7 CONTRACTOR QUALIFICATIONS. Contractor must possess a valid Class C-57 California Contractor's License. Contractor shall have a minimum of five years’ experience in well pump and submersible motor installation work and shall provide a minimum of three references of similar work completed within the last three years to District at their request. 2

1.8 APPLICABLE CODES. References in the Contract Documents to local codes mean latest editions of the following:    

National Electric Code (NEC) American Water Works Association (AWWA) Hydraulic Institute Standards (HIS) American Institute of Steel Construction (AISC)

Other standard codes which apply to the Work are designated in the Specifications. In case of conflict between codes, reference standards and other Contract Documents, the most stringent requirements shall govern. 1.9. REFERENCE STANDARDS. Reference to standards, specifications, manuals, or codes of any technical society, organization, or association, or to the laws or regulations of any governmental authority, whether such reference be specific or by implication, shall mean the latest standard specification, manual, code, or laws or regulations in effect at the time of opening of Bids (or on the effective date of the Contract or Agreement if there were no Bids), except as may be otherwise specifically stated in the Contract Documents. However, no provision of any referenced standard, specification, manual, or code, or any instruction of a Supplier, shall be effective to change the duties or responsibilities of Owner, Contractor, or Engineer, or any of their subcontractors, consultants, agents, or employees from those set forth in the Contract Documents, nor shall any such provision or instruction be effective to assign to Owner, Engineer, or any of Engineer's CONSULTANTS, agents, or employees, any duty or authority to supervise or direct the performance of the Work or any duty or authority to undertake responsibility inconsistent with the provisions of the Contract Documents. 2.0 SUBMITTALS PROCEDURES 2.1 SHOP DRAWINGS AND ENGINEERING DATA. 2.1.01 General. Shop Drawings and engineering data (submittals) covering all equipment and all fabricated components which will become a permanent part of the Work shall be submitted to the Engineer for review, as required. Submittals shall verify compliance with the Contract Documents, and shall include drawings and descriptive information in sufficient detail to show the kind, size, arrangement, and the operation of component materials and devices; the external connections, anchorages, and supports required; the performance characteristics; and dimensions needed for installation and correlation with other materials and equipment.

3

All submittals, regardless of origin, shall be approved by Contractor and clearly identified with the name and number of this Contract and Contractor's name. Each copy of all submittals, regardless of origin, shall be stamped or affixed with an approval statement of Contractor. Each submittal shall indicate the intended use of the item in the Work. When catalog pages are submitted, applicable items shall be clearly identified and inapplicable data crossed out. The current revision, issue number, and date shall be indicated on all drawings and other descriptive data. Contractor shall be solely responsible for the accuracy and completeness of each submittal. Contractor's stamp or affixed approval statement of a submittal, is a representation to Owner and Engineer that Contractor accepts sole responsibility for determining and verifying all quantities, dimensions, field construction criteria, materials, catalog numbers, and similar data, and that Contractor has reviewed and coordinated each submittal with the requirements of the Work and the Contract Documents. All deviations from the Contract Documents shall be identified as deviations on each submittal and shall be tabulated in Contractor's letter of transmittal. Such submittals shall, as pertinent to the deviation, indicate essential details of all changes proposed by Contractor. One electronic copy and a minimum of one hard copy shall be submitted. Engineer will not accept submittals from anyone but Contractor. 2.1.02 Engineer's Review of Submittals. Engineer's review of submittals covers only general conformity to the Specifications; it does not indicate thorough review of all dimensions, quantities, and details of the material, equipment, device, or item covered. Engineer's review shall not relieve Contractor of sole responsibility for errors, omissions, or deviations in the drawings and data, nor of Contractor's sole responsibility for compliance with the Contract Documents. Engineer's submittal review period shall be 3 business days and shall commence on the first calendar day following receipt of the submittal or resubmittal in Engineer's office. When the drawings and data are returned with review status "NOT ACCEPTABLE - RESUBMIT" or " MAKE CORRECTIONS NOTEDRESUBMIT," the corrections shall be made as instructed by Engineer. When the drawings and data are returned with review status, "NO EXCEPTIONS TAKEN," or "FOR RECORD COPY," or “NOT REVIEWED,” no additional action will be required unless specifically requested by Engineer.

4

2.1.03 Resubmittal of Drawings and Data. Contractor shall accept full responsibility for the completeness of each resubmittal. Contractor shall verify that all corrected data and additional information previously requested by Engineer are provided on the resubmittal. Requirements specified for initial submittals shall also apply to resubmittals. Resubmittals shall be made within 5 business days of the date of the letter returning the material to be modified or corrected, unless within 2 business days Contractor submits an acceptable request for an extension of the stipulated time period, listing the reasons the resubmittal cannot be completed within that time. The need for more than one resubmittal, or any other delay in obtaining Engineer's review of submittals, will not entitle Contractor to extension of the Contract Times unless delay of the Work is the direct result of a change in the Work authorized by a Change Order or failure of Engineer to review and return any submittal to Contractor within the specified review period. 2.2 OPERATION AND MAINTENANCE DATA AND MANUALS. Adequate operation and maintenance information shall be supplied for all equipment requiring maintenance or other attention. Operation and maintenance manuals shall include the following: a. Equipment function, normal operating characteristics, and limiting conditions. b. Assembly, installation, alignment, adjustment, and checking instructions. c. Operating instructions for startup, routine and normal operation, regulation and control, shutdown, and emergency conditions. d. Lubrication and maintenance instructions. e. Guide to troubleshooting. f. Parts lists and predicted life of parts subject to wear. g. Outline, cross section, and assembly drawings; engineering data; and wiring diagrams. h. Test data and performance curves, where applicable. The operation and maintenance manuals shall be in addition to any instructions or parts lists packed with or attached to the equipment when delivered, or which may be required by Contractor. 3.0 GENERAL EQUIPMENT STIPULATIONS 3.1 SCOPE. When an equipment specification section in this Contract references this section, the equipment shall conform to the general 5

stipulations set forth in this section, except as otherwise specified in other sections. 3.2 COORDINATION. Contractor shall coordinate all details of the equipment with other related parts of the Work, including verification that all structures, piping, wiring, and equipment components are compatible. Contractor shall be responsible for all structural and other alterations in the Work required to accommodate equipment differing in dimensions or other characteristics from that contemplated in the Specifications. 3.3 MANUFACTURER'S EXPERIENCE. Unless specifically named in the Specifications, a manufacturer shall have furnished equipment of the type and size specified which has been in successful operation for not less than the past 5 years. 3.4 WORKMANSHIP AND MATERIALS. Contractor shall guarantee all equipment against faulty or inadequate design, improper assembly or erection, defective workmanship or materials, and leakage, breakage, or other failure. Materials shall be suitable for service conditions. All equipment shall be designed, fabricated, and assembled in accordance with recognized and acceptable engineering and shop practice. Individual parts shall be manufactured to standard sizes and thicknesses so that repair parts, furnished at any time, can be installed in the field. Like parts of duplicate units shall be interchangeable. Equipment shall not have been in service at any time prior to delivery, except as required by tests. Except where otherwise specified, structural and miscellaneous fabricated steel used in equipment shall conform to AISC standards. All structural members shall be designed for shock or vibratory loads Unless otherwise specified, all steel which will be submerged, all or in part, during normal operation of the equipment shall be at least 1/4 inch thick. When dissimilar metal components are used, consideration shall be given to prevention of galvanic corrosion. 3.5 LUBRICATION. Lubricants of the types recommended by the equipment manufacturer shall be provided in sufficient quantities to fill all lubricant reservoirs. Lubricants for equipment where the lubricants may come in contact with water before or during a potable water treatment process or with potable water, shall be food grade lubricants. This includes lubricants for equipment not normally in contact with water, but where accidental leakage of the lubricants may contaminate the water. 3.6 PREPARATION FOR SHIPMENT. All equipment shall be suitably packaged to facilitate handling and to protect against damage during transit 6

and storage. All equipment shall be boxed, crated, or otherwise completely enclosed and protected during shipment, handling, and storage. All equipment shall be protected from exposure to the elements and shall be kept dry at all times. Painted and coated surfaces shall be protected against impact, abrasion, discoloration, and other damage. Painted and coated surfaces which are damaged prior to acceptance of equipment shall be repainted to the satisfaction of the Engineer. Grease and lubricating oil shall be applied to all bearings and similar items. 3.7 SHIPPING. Complete packing lists and bills of material shall be included with each shipment. 3.8 DELIVERY. Contractor shall bear the responsibility for delivery of equipment, spare parts, and materials to the site and shall comply with the requirements specified herein and shall provide required information concerning the shipment and delivery of the materials specified. These requirements also apply to any subsuppliers making direct shipments to the Site. Contractor shall, either directly or through contractual arrangements with others, accept responsibility for the safe handling and protection of the equipment and materials furnished before and after receipt at the port of entry. Acceptance of the equipment shall be made after it is installed, tested, placed in operation and found to comply with all the specified requirements. All items shall be checked against packing lists immediately on delivery to the site for damage and for shortages. Damage and shortages shall be remedied with the minimum of delay. Delivery of portions of the equipment in several individual shipments shall be subject to review of Engineer before shipment. When permitted, all such partial shipments shall be plainly marked to identify, to permit easy accumulation, and to facilitate eventual installation. 3.9 STORAGE. Upon delivery, all equipment and materials shall immediately be stored and protected until installed in the Work. Stacked items shall be suitably protected from damage by spacers or load distributing supports that are safely arranged. No metalwork (miscellaneous steel shapes and reinforcing steel) shall be stored directly on the ground. Pipe, fittings, and valves may be stored out of doors, but must be placed on wooden blocking. 7

Pumps, motors, electrical equipment, and all equipment with antifriction or sleeve bearings shall be stored in weather-tight structures maintained at a temperature above 60°F [16°C]. Electrical equipment, controls, and insulation shall be protected against moisture and water damage. Equipment having moving parts, such as gears, bearings, and seals, shall be stored fully lubricated with oil, grease, etc., unless otherwise instructed by the manufacturer. Manufacturer's storage instructions shall be carefully followed by Contractor. Equipment and materials shall not show any pitting, rust, decay, or other deleterious effects of storage when installed in the Work. In addition to the protection specified for prolonged storage, the packaging of spare units and spare parts shall be for export packing and shall be suitable for long-term storage in a damp location. Each spare item shall be packed separately and shall be completely identified on the outside of the container. 3.10 HANDLING. Stored items shall be laid out to facilitate their retrieval for use in the Work. Care shall be taken when removing the equipment for use to ensure the precise piece of equipment is removed and that it is handled in a manner that does not damage the equipment. During handling, carbon steel constructed material including chains, straps, and forks on lifting equipment shall not directly contact any equipment or material constructed of stainless steel. It shall be the Contractor’s responsibility to correct any carbon steel contamination of stainless steel. 4.0 SUBMERSIBLE RAW WATER WELL PUMP AND MOTOR 4.1 SCOPE. This section covers one vertical, submersible pumping unit to be installed in the existing Main Street raw water well as indicated on Figure 1. The pumping unit shall be complete with submersible electric motor; bowl assemblies, sounding tube, discharge column/riser pipes, electrical cables, and all other appurtenances specified or otherwise required for proper operation. 4.2 GENERAL. Equipment furnished and installed under this section shall be fabricated, assembled, erected, and placed in proper operating condition in full conformity with drawings, specifications, engineering data, instructions, and recommendations of the equipment manufacturer, unless exceptions are noted by the Engineer. Hydraulic considerations and definition of terms shall be as set forth in the Hydraulic Institute Standards. 8

4.2.01 General Equipment Stipulations. Unless otherwise specified, the General Equipment Stipulations shall apply to all equipment furnished under this section. 4.2.02 Power Supply. Power supply to equipment is 480 volts, 60 Hz, three phase. 4.3 WARRANTY. All equipment furnished under this section shall be free from defects in workmanship, design, and materials, and performance shall be guaranteed for the entire warranty period. Any material or equipment failing during the warranty period shall be repaired or replaced by the manufacturer at no cost to the District. In addition, the pump covered under this section shall be provided with a five year limited warranty. The warranty shall cover against defects in workmanship and material covering parts and labor. The warranty shall begin on the date of substantial completion and shall cover 10,000 hours of operation. The pump manufacturer shall pay the following share of the cost of replacement parts and labor. TIME AFTER SUBSTANTIAL COMPLETION Months: Hours: Warranty:

0 – 18 0 – 3000 100%

19 – 39 3000 – 6500 50%

40 - 60 6500 - 10,000 25%

The pump manufacturer or local representative shall be notified in the event of a problem. Cost for parts and labor purchased or performed without notification and inspection by the manufacturer's local representative shall not be covered by the warranty unless the requirements of this section are not met. 4.4 LOCAL REPRESENTATION. The pump supplier shall have a local representative with a permanent place of business within 750 miles of the site and shall guarantee a maximum response time of 8 hours to have a qualified employee report to the site upon notification by the District of an emergency situation requiring such action. 4.5 SUBMITTALS. Complete fabrication, assembly, foundation, and installation drawings, together with detailed specifications and data covering materials, parts, devices, and accessories forming a part of the equipment furnished, shall be submitted in accordance with the Submittals Procedures section. The data and specifications for each unit shall include, but shall not be limited to, the following: 9

Pump        

Name of manufacturer. Type and model. Rotative speed. Size of discharge elbow outlet. Net weight of pump and motor only. Complete performance curves (full speed and reduced speed conditions) showing capacity versus head, bhp, NPSH required, and efficiency. Data on shop painting.

Motors          

Name of manufacturer. Type and model. Type of bearings and method of lubrication. Rated size of motor, hp. Temperature rating. Full load rotative speed. Net weight. Efficiency at full load and rated pump condition. Full load current. Locked rotor current.

Complete Pumping Unit  Max overall dimensions.  Total weight (including riser pipe).  Anchorage calculations and details signed and sealed by a CA licensed Civil District Engineer. Moisture Detection System     

Name of manufacturer. Type and model. Enclosure rating and layout if an enclosure is specified. Electrical schematics and wiring diagram. Published descriptive data on each item of equipment and all accessories, indicating all specific characteristics and options.

4.6 SERVICE CONDITIONS. The submersible pumping unit shall pump raw water and shall be installed in the existing Main Street raw water well. The pumping unit shall be designed to operate as stand-alone unit and shall be designed for continuous operation. 10

4.7 PERFORMANCE AND DESIGN REQUIREMENTS. Pumping unit shall be designed for the following operating conditions and requirements: Rated total head (ft)

390

Maximum capacity at rated head (gpm)

1,000

Head range for maximum capacity (ft)

344 - 390

Max pump operating speed at rated head (rpm)

1800

Nominal size of pump discharge (in)

10

Minimum diameter of pump riser (in)

10

Minimum column/riser length (ft)

200

Rated for operation by existing Variable Frequency Drive

Mitsubishi FR-F540L-132KNA (Type 2)

For design and rating purposes, the water to be pumped shall be assumed to have a temperature of 76° F. The rated performance of the pumping unit shall include the losses in the discharge pipe, discharge elbow, and cable losses. Pump performance shall be stable and free from damaging cavitation, vibration, and noise in the operating head range. The performance of the pump shall be based on a radial running clearance between the bowl wearing ring and the impeller of not less than 6 mils or 0.5 mil per inch of wearing ring diameter, whichever is greater. The pumping unit shall be designed so that maximum reverse rotation due to reverse flow at rated head will not cause damage to any component. Well pumps shall be manufactured by Floway, or equal. 4.8 MATERIALS. Pump Bowls

Cast iron, ASTM A48.

Enclosed Impellers

Bronze, ASTM B584.

Impeller Wearing Rings

Martensitic stainless steel, Brinell 200-250. 11

Bowl Wearing Rings

Martensitic stainless steel, Brinell 300+.

Bowl Assembly Shaft

Martensitic stainless steel, AISI Type 410 or 416.

Bowl Bearings

Bronze, ASTM B584, water lubricated, except top case bearing shall be permanently packed with waterresistant grease.

Bowl Bolting

316 SS

Impeller Collets

316 SS

Pump Column

ASTM A53, Grade A Schedule 80 steel pipe, with threaded couplings.

Inline Check Valve recommendation

Ductile iron or pump manufacturers

Sound Tubing

Schedule 80 PVC, 1-inch diameter

Strainer

304L Stainless steel.

Pump Motor Coupling

Stainless steel

Cable Clamps

Stainless steel

Motor Cable Splice

Metal or plastic

Conductor Guard

Stainless steel

Cable Seal Gland

Bronze

Anchor Bolts, Nuts and Washers

Stainless steel

12

Thread Lubricant Pipe Threads Pump/Motor Coupling Threads

Teflon paste-type thread sealer, suitable for potable water service. Jet-Lube "Nikal," John Crane "Thred Gard Nickel," Never-Seez "Pure Nickel Special," or Permatex "Nickel AntiSeize."

Epoxy Coating Primer (First Coat)

Ameron "Amerlock 400 High-Solids Epoxy Coating," Carboline "Carboguard 891," or Tnemec "Series N140 Pota-Pox Plus."

Finish Coat

Ameron "Amerlock 400 High-Solids Epoxy Coating," Carboline "Carboguard 891," or Tnemec "Series N140 Pota-Pox Plus."

4.9 PUMP CONSTRUCTION. 4.9.01 Impellers and Bowls. Impellers shall be accurately machined and dynamically balanced and securely locked on the pump shaft. Pump inlet shaft shall be provided with an inlet strainer. 4.9.02 Wearing Rings. Renewable wearing rings shall be provided in the bowls and on the impeller. The rings shall be positively locked in place so they will not move or loosen during any condition of operation or handling, including reverse rotation of the pump. Bowls shall be equipped with wearing rings designed to maintain pump efficiency. 4.9.03 Pump Column/Riser. Column sections shall be so designed and constructed that accurate alignment will be obtained when the column/riser is assembled. The type of couplings shall be threaded. 4.9.04 Sounding Tube. One sounding tube shall extend from the pump discharge surface plate to a point one foot above the pump inlet fitting. The tubing shall be securely fastened to the pump column/riser pipe by plastic or stainless steel bands at a minimum of 15-foot intervals. Contractor shall drill one ¼” hole in each stick of PVC sounding tube.

13

4.9.05 Inline Check Valve. The Contractor shall supply and install one or multiple inline check valves as specified by the pump manufacturer. 4.10 FABRICATION AND MANUFACTURE. 4.10.01 Painting. All iron and steel parts (other than steel riser pipe) which will be in contact with pumped liquid or submerged after installation, including the motor, interior/exterior of bowl assembly, the impeller, and the discharge elbow, shall be shop cleaned in accordance with the coating manufacturer's recommendations and painted with an ANSI/NSF 61 epoxy coating system. The coating shall have a dry film thickness of at least 10 mils and shall consist of a prime (first) coat and one or more finish coats. At least 1 quart of the finish coat material shall be furnished with each pump for field touchup. 4.10.02 Balance. All rotating parts shall be accurately machined and shall be in as nearly perfect rotational balance as practicable. Excessive vibration shall be sufficient cause for rejection of the equipment. The mass of the unit and its distribution shall be such that resonance at normal operating speeds is avoided. In any case, the unfiltered vibration displacement (peak-to-peak), as measured at any point on the machine, shall not exceed 4 mils. At any operating speed, the ratio of rotative speed to the critical speed of a unit or its components shall be less than 0.8 or more than 1.3. 4.11 ELECTRIC MOTOR. The pumping unit shall be furnished with a completely enclosed submersible motor suitable for continuous duty under water and sized for the load conditions specified herein. The motor shall be rated for 480 volts, 3-phase, 60 Hz. Motor service factor shall be 1.15. The motor shall be rated to operate with the existing variable frequency drive (Mitsubishi FR-F540L-132K-NA Type 2). The motor shall be designed to operate on a power system that may contain up to 5 percent of harmonic distortion. Submersible motors shall be water-filled and suitable for use in submersible motors in potable water pumping applications. The water shall be continuously circulated throughout the motor for cooling and rotor, stator, and bearings. The motor shall have a pressure balancing system which shall maintain a pressure balance between the internal and external fluids. The pump shall be equipped with one or more multiconductor cable assemblies for power and control. Each multiconductor assembly containing power cables shall be provided with a separate grounding conductor. Each 14

cable assembly shall bear a permanently embossed code or legend indicating the cable is suitable for submerged use. Cable sizing shall conform to NEC requirements. The pump supplier shall be responsible for coordinating the pump and drive components to ensure that a complete and properly operating system is furnished. All equipment shall be derated as recommended by the drive and motor manufacturers for reduced speed operation with a variable frequency controller in addition to any derating requirements specified elsewhere. The motor shall be supplied with full phase insulation on the end turns and shall meet the requirements of NEMA MG 1, Part 31. In addition to the requirements of NEMA MG 1, Part 31, the motor shall be designed to be continually pulsed at the motor terminals with a voltage of 1600 volts ac. The pump supplier shall be responsible for the collection of data and the design effort required to limit harmonics to levels specified. The motor shall be equipped with a double mechanical seal or similar type premium seal which is designed to prevent contaminants from reaching the interior of the motor. Mercury type seals will not be acceptable. The motor shall incorporate downthrust bearings which are capable of supporting the entire weight of all rotating components plus the hydraulic thrust developed by the pump. The motor shall also have an upthrust bearing with a load rating of at least equal to 25% of the downthrust rating. 4.12 POWER CABLE. The pump motor shall be furnished with a power cable. The power cable shall connect the motor terminals to a junction box above the well surface plate for connection to the motor starter. The power cable shall comply with all applicable requirements of the NEC. The cable shall be insulated to 600 volts ac with insulation suitable for service connections. The cable shall be supported by suitable non-corrosive, nonmagnetic means to prevent heavy loading on the cable connections in the junction box. Sufficient stainless steel cable clamps shall be provided to allow the cable to be clamped to the column pipe at intervals not to exceed 15 feet. The cable entry water seal shall include a strain relief and a grommet type seal designed so that a specific fastener torque is not required to ensure a watertight, submersible seal. The cable entry junction box and motor shall be separated by a stator lead sealing gland or a terminal board. The junction box shall isolate the motor interior from moisture gaining access through the top of the stator housing.

15

4.13 CONTROLS. Each motor shall be protected by one motor temperature switch embedded in each phase winding. Each switch shall be designed to operate at 140°C (± 5°C). Each switch shall be normally closed automatic reset type rated 5 amps at 120 volts ac. The switches shall be wired in series with end leads wired to terminals within the motor housing. The motor housing shall be provided with a moisture detection system complete with all sensors, control power transformers, intrinsically safe control modules, and relays. The moisture detection system shall be rated for a 120 volt ac supply. The moisture detection system shall provide two normally open dry output contacts rated 5 amps at 120 volts ac. The contacts shall close when moisture is detected in the motor housing. All moisture detection system components shall be furnished by the pump supplier and shall be mounted in a NEMA 4 stainless steel enclosure. 4.14. SHOP TESTS. The pumping unit shall be tested at the factory for capacity, power requirements, and efficiency at specified rated head, shutoff head, operating head extremes, and at as many other points as necessary for accurate performance curve plotting. All tests and test reports shall conform to the requirements and recommendations of the Hydraulic Institute Standards. Acceptance testing shall be Table 14.6.3.4 Grade 1U, with no minus tolerance or margin allowed. Five certified copies of a report covering each test shall be prepared by the pump manufacturer and delivered to the District Engineer prior to the shipment of the equipment from the factory. The report shall include data and test information as stipulated in the Hydraulic Institute Standards, copies of the test log originals, test reading to curve conversion equations, and certified performance curves. The curves shall include head, bhp, pump efficiency, and shop test NPSH available, plotted against capacity. The curves shall be easily read and plotted to scales consistent with performance requirements. All test points shall be clearly shown. 5.0 EXECUTION 5-1. INSTALLATION. The pump shall be installed in accordance with the Hydraulic Institute Standards and as specified herein. Existing column pipe, if reused, may need steam cleaning or pressure washing. The bid schedule allows for 8 hours for this subtask, if needed. All permanent equipment and material to be installed in the well shall be disinfected just before installation in accordance with AWWA Standard C654-13. This shall be done by spraying exposed areas with a solution having a chlorine residual of not less than 200 ppm. 16

The surface mounting plate shall be grouted after initial fitting and alignment, but before final bolting of connecting piping. Special care shall be taken to maintain alignment of pumping unit components. No stresses shall be transmitted to the pump flanges. After final alignment and bolting, connections to pumping equipment shall be tested for applied piping stresses by loosening the flange bolts. If any movement or opening of the joints is observed, piping shall be adjusted to proper fit. Couplings shall be realigned after grouting. Final coupling misalignment shall be within one-half of the coupling manufacturer's allowable tolerance. 5.2 FINAL DISINFECTION. Final disinfection of the well after the pumping equipment has been installed shall be performed in accordance with AWWA Standard C654-13 and achieved using a chlorine solution of calcium or sodium hypochlorite together with an NSF-61 certified chlorine enhancer (such as Johnson NuWell 410). Chlorine shall be used in sufficient quantity to achieve a 200 ppm chlorine dose. Pre-mix the solution in a tank starting with adding the calcium or sodium hypochlorite. All mixing should be done in a well-ventilated area. The chlorine solution pH shall be adjusted to 7.5 to 8.0 before introducing it into the well. Solution will be surged into the screen with the well pump and/or circulated within the well casing and pump column. After disinfection, the well shall be flushed after leaving it in the well overnight. Discharge of chlorinated water shall be to the backwash water reclaim tank, where it will be dechlorinated with sodium thiosulfate or similar method and then discharged to the sanitary sewer. The reclaim tank has an approximate capacity of 66,000 gallons. Sewer discharge shall be limited to the hours of 11 am to 4 pm. 5.3 INSTALLATION PERFORMANCE AND TESTING. 5.3.01 Installation and Operation Check. An experienced, competent, and authorized representative of the manufacturer shall visit the site of the Work and inspect, check, adjust if necessary, and approve the equipment installation. The representative shall be present when the equipment is placed in operation under full load, and shall revisit the job site as often as necessary until all trouble is corrected and the equipment installation and operation are satisfactory in the opinion of the Engineer. The manufacturer's representative shall furnish a written report certifying that the equipment has been properly installed and lubricated; is in accurate alignment; is free from any undue stress imposed by connecting piping or

17

anchor bolts; and has been operated under full load conditions and that it operated satisfactorily. All costs for these services shall be included in the contract price. 5.3.02. Installation Supervision. Installation supervision by the manufacturer is not required.

18