§ 50-259. Execution.

(a)

The developer shall furnish, install and dedicate to the city the entire lift station/force main system. The system will be designed by the developer's engineer (professional engineer registered in the state). The design must be reviewed and approved by the city's engineer.

(b)

The engineer shall locate the lift station to drain the largest possible subbasin. The city will investigate the service impact associated with future city needs within the subbasin, and the potential installation of additional force mains required to serve the subbasin that will drain to the lift station. If, in the city's opinion, an additional or larger force main is to be installed concurrently with the developer's project, the engineer will design and the city's engineer must approve the design of said additional mains. Where practical, all of the force mains will be installed in parallel and in the same ditch.

(c)

Pump stations shall meet the following requirements:

(1)

Pump station located above the 100-year floodplain.

(2)

Furnish pump head calculations and system curve.

(3)

Furnish automatic alternation of pumps to prolong life.

(4)

Cables into or out of the wet well sealed watertight.

(5)

Install three-phase voltage monitors on main power feed with output alarm relay.

(6)

Install fused disconnect on main power feed.

(7)

Furnish wet well buoyancy calculation based on a groundwater level approximately at grade level.

(d)

Pump stations with a capacity less than 750 GPM shall be one of the following:

(1)

Submersible pumps:

a.

Flygt.

b.

Yeomans.

c.

KSB.

(2)

All pumps must be supplied with a certified pump test curve from the manufacturer.

(3)

Gorman-Rupp self-priming centrifugals will only be allowed on a case-by-case basis when other pumps are not available.

(4)

All pumps must he able to pass a three-inch solid.

(e)

Site layout.

(1)

A buffer may be required around each lift station site. The city, at its discretion, may require a buffer dependent on the proximity of structures, type of development, size of pump station, or other factors which may indicate a need for additional buffer. Typically, this buffer is required in residential subdivisions, and shall be indicated on the final plat. In addition, a permanent easement, dedicated to the city, shall be provided to include the required fenced-in area, with an additional six inches extending beyond the fence on all sides. A permanent 20-foot access easement, dedicated to the city, shall be provided as well.

(2)

Earth slopes around the pump station created by fill that are steeper than 3:1 must be stabilized with riprap. All fill slopes shall be compacted to not less than 95 percent of maximum density. A certified letter of compaction shall be provided to the inspector prior to final inspection.

(3)

A minimum four-inch concrete pad (15 feet by 15 feet minimum) shall have five percent fall away from the wet well in all directions. Concrete must extend six inches past all fence posts the full perimeter. Reinforcing steel shall be used in the slab. Asphalt is not acceptable for the pad.

(4)

Driveway.

a.

All pump station sites shall be provided with a paved access road on a permanent easement dedicated to the city minimum 12-foot width concrete or asphalt paving is acceptable.

b.

If an access road is over 50 feet in length, a vehicle turnaround will be required. For access roads less than 50 feet, a required turnaround will be determined on a case-by-case basis. Access road and vehicle turnaround area to be paved shall be a 12-foot minimum width. All turnarounds shall be 20 feet outside the fence, 16 feet deep with a 15-foot radius to the driveway. Concrete or asphalt is acceptable.

(5)

Site plan shall show finished grade contour lines (two-foot intervals) in and around lift station and access road. Spot elevations shall be provided on station pad to show proper drainage.

(6)

Site plan shall show all existing and proposed utilities. All utility meters must be properly mounted outside a fenced station. If gas is required gas pipe must be buried underground.

(7)

Water meter shall be set at the right-of-way.

(8)

A copper potable water service with an acceptable double check valve backflow prevention device must be provided. A frostproof yard hydrant with 50 feet of one-inch water hose with brass nozzle must be installed.

(9)

Provide site lighting.

(10)

Fenced areas for all stations are to be a minimum 30 feet by 30 feet. Fences are to be installed using eight-foot-high no. 4 chainlink wire with top rails and bottom tension wires; three strands of barbed wire at the top on angled extension arms; posts in three feet of concrete spaced ten feet apart. A two-foot length of chain that can be locked with No. 2 Master lock must be provided. Provide a 14-foot-wide gate on four-inch diameter posts.

(11)

All ground surface not intended to be paved within pump station fenced area, shall be covered with a minimum four inches of graded aggregate base. Graded aggregate base to be per state department of transportation specifications.

(12)

Spare parts.

a.

Provide spare air and vacuum relief valve for force main (if applicable).

b.

Provide two extra sets of seals per model of pump, two sets of wear rings, one vacuum pump, five float switches, and one motor starter.

c.

Provide one spare fuse of each type used.

(13)

Wet well/check valve vault.

a.

The wet well shall be sized to prevent excessive cycling of the pumps. Starts shall be limited to one start per ten minutes unless otherwise recommended by the pump manufacturer. Size shall be as recommended by the pump supplier and shall be a minimum of eight feet in diameter.

b.

Hatch doors shall be sized by the pump supplier to allow adequate clearance to easily remove the pumps. Hatches shall be aluminum with stainless steel hardware suitable for 150 pounds per square feet loading. Provide cylinders to prevent hatch from slamming shut and safety netting.

c.

Check valve vaults for all stations shall be six feet by six feet precast concrete with one 48-inch by 48-inch double leaf aluminum hatch for four-inch and six-inch piping. Vault size shall be eight feet by eight feet for piping eight inches and above.

d.

Storage shall be provided above the high-level alarm equal to three hour at design flow. Storage volume is calculated to be that volume between the high-level alarm and the lowest point of overflow (including basement elevations regardless of backflow valves in service lines). Said storage may consist of any combination of line capacity, manhole capacity, and wet well volume. No corrugated metal pipe may be utilized for storage.

e.

Swing check valves:

1.

Val-Matic Swing Flex.

2.

GA Industries, Inc., Mars, PA.

3.

American Darling.

4.

Approved equal.

f.

All pump stations shall have a plug valve and capped tee installed on the force main to allow for emergency connection by portable pumps. Plug valve shall be no less than three feet outside the pump station. A valve key shall be provided to the authority.

g.

All piping in the wet well and check valve vault is to be flanged pipe to flanged pipe. No uniflange or megaflange types will be allowed. Solid sleeve flex joint shall be used between the wet well and valve vault.

h.

Floats and probes shall be installed at the closest accessible location.

i.

Steps are to be removed and grouted from wet well and check valve vault before station is accepted by the authority.

j.

Wet well and discharge manholes are to be fiberglass or to be coated with a bitumastic coating or approved equal.

k.

All pump stations shall comply with NFPA 820.

(14)

Electrical specifications:

a.

Three-phase power shall be provided for all pumps. No phase converters or single-phase power allowed. The power source may be 208 voltage, 240 voltage or 480 voltage.

b.

All conduit shall be galvanized rigid conduit or MMC with threaded couplings. No threadless couplings shall be allowed.

c.

No conduit runs or junction boxes are to be installed inside or on top of wet well. Splicing of cables inside the wet well will not be permitted.

d.

When main fused disconnect switch or main circuit breaker is used, it shall meet the following requirements:

1.

Be of a type that can be locked in the on or off position.

2.

The switch shall be U.L. listed for service entrance.

3.

The enclosure shall be stainless steel.

4.

The switch must be mounted inside the fenced area of the station.

e.

Pump stations shall have factory installed six-digit nonresettable elapsed time meters to show individual pump running times to the one-tenth of an hour. A similar elapsed time meter shall be included to indicate simultaneous operation of pumps to the one-tenth of an hour.

f.

All control wiring shall be stranded. No solid wire shall be allowed.

g.

Pump control panel enclosure shall be NEMA 4X stainless steel.

h.

Provide one RJ-11 telephone jack in the control panel.

i.

A surge suppressor shall be provided at the power service entrance. The surge suppressor shall have voltage characteristics to match the power service.

1.

The surge suppressor shall be in NEMA 4X enclosure and shall provide line to line, line to neutral, line to ground and neutral to ground protection modes as applicable for the power service.

2.

The surge suppressor shall be provided with a disconnect. Minimum surge current rating shall be 100KA per phase per NEMA LS-1. The surge suppression system shall be duty cycle tested to survive 20KV, 10KA, IEEE C62.41 category surge current with less than five percent degradation of clamping voltage. The surge suppressor shall have minimum repetitive surge capacity of 2,500 impulses per mode and 5,000 impulses per phase. Status indicating lights and form C dry alarm contacts shall be provided.

3.

The surge suppressor shall be UL listed and labeled under UL 1449 and UL 1283.

Acceptable manufacturers are:

(i)

Liebert.

(ii)

Current Technologies.

(iii)

United Power.

(15)

All pump stations must he provided with backup power. This back-up power can be provided by independent dual power feed or diesel generators.

(16)

Generator specifications:

a.

Generator shall be furnished with a one-year service contract which covers all labor and material costs for normal maintenance and emergency repairs.

b.

The standby generator shall be rated for continuous standby duty for the stations full load demand. The generator shall be sized to run all pumps simultaneously with staggered startups or as indicated in the drawings. The engine-generator set shall be rated for continuous standby duty operating in an ambient temperature of 40 degree C. The set shall have a standby power capacity sufficient to operate all pumps simultaneously with staggered startups and pump station auxiliary loads at 0.80 power factor, and shall operate at a speed not to exceed 1,800 rpm. It shall be rated 480/277 volt, as indicated, three-phase, four-wire, 60-Hertz.

c.

Voltage regulation from no load to rated load shall be within plus or minus four percent of rated voltage for units up to and including 25 kw and within plus or minus three percent of rated voltage for units rated 30 kw or higher.

d.

The frequency regulation shall not exceed three-Hertz from no load to rated load. Frequency variation shall not exceed plus or minus 0.3 Hertz for constant loads from no load to rated load.

e.

Instantaneous voltage dip for all possible sequences of load application and motor starting for loads described in conditions of service shall not exceed 20 percent of nominal voltage.

f.

The generator and associated appurtenances shall be housed in a weatherproof sound attenuated enclosure. Quiet site soundproofing shall be provided to reduce noise to 73 db at a distance of 23 feet (seven meters) for diesel powered generators.

g.

Generator insulation shall be class B or F. Temperature rise shall be in accordance with NEMA Standard MG-1 for continuous duty at all output ratings.

h.

Voltage regulator shall be an automatic, temperature compensated, solid state type with a manual adjustment range of plus or minus five percent of rated voltage. Exciter shall be a solid-state, static type or brushless rotating type utilizing rotating diode rectifiers. Minimum rating of exciter shall be according to NEMA Standard MG-1.

i.

Generator lead terminal box shall be of ample size to accept and terminate connecting cables as indicated on the drawings. Generator leads shall be furnished with terminal connectors suitable for the customers connecting cables.

j.

The engine shall be heavy-duty compression-ignition, cold-starting diesel type arranged for direct connection to an alternating current generator. It shall be a current model of a type in a regular production by a manufacturer regularly engaged in building this type of diesel engine. Engine shall have at least a published intermittent brake horsepower rating at specified generator speed required by generator at rated full load output and shall operate without undue heating, vibration, or wear. Engine shall operate satisfactorily on No. 2 diesel fuel.

k.

Battery charger shall be automatic, two-rate type providing for equalizing charge and continuous taper charging. Output characteristics shall match requirements of battery furnished. Provided charger suitable for operation on 120 volt, single-phase, 60-Hertz current to be rated not less than six-amp direct current. Furnish battery charger with following features:

1.

Direct current voltage regulation: plus or minus two percent for variations in line voltage of plus or minus ten percent.

2.

Direct current voltmeter and direct current ammeter, each with suitable scales.

3.

Automatic current limiting to prevent overloading due to engine cranking, shorted output or reversed battery connections.

4.

Equalize charge rate with manually set timer.

5.

Integral protection to prevent battery discharge through charger on loss of alternating current line voltage.

6.

Terminal block with terminals for all external connections.

l.

The entire standby generator set shall have a five-year warranty period from the date of commissioning.

m.

Outdoor weather-protective housing with critical grade exhaust muffler shall be installed. The housing shall have hinged side access doors and a rear control door. All doors shall be lockable. All sheet metal shall be primed for corrosion protection and finish painted with the manufacturer's standard color. Vibration isolators as recommended by the generator set manufacturer shall be provided. The generator must be mounted far enough away from obstructions to allow all doors to be opened 90 degrees. All conduits shall be installed underground.

n.

Generator shall be supplied with all auxiliary systems necessary for operation (e.g., batteries, battery charger, block heater, convenience receptacle, enclosure light, motorized dampers etc.). The auxiliary system shall be powered from load center with adequately sized 480 1 208 1 120 V transformer, installed in the enclosure.

o.

Generator control panel shall be mounted with vibration isolators on the unit. Instruments shall be of direct-reading type, factory mounted and factory connected. Instruments shall be accurate within three percent. Provide panel with the following instruments gauges, features and alarms:

1.

Three position manual-off-auto switch.

2.

Manual starting switch.

3.

Emergency shutdown switch.

4.

Full automatic starting from pilot device initiating start when normal power fails. Automatic cranking shall be interrupted cycle type not affected by ambient temperature with overall time limit. A total of five cranking cycles shall automatically shut down engine after a time delay.

5.

Automatic shutdown devices with manual reset and individual indicating lights for low oil pressure, high coolant temperature, engine over-speed, and failure of engine to start. Auxiliary contacts on all aforementioned shutdown devices to operate a remote generator failure alarm.

6.

Gauges and instruments shall include fuel gauge, running time meter, lubricating oil gauge, coolant temperature gauge, voltmeter, and ampmeter.

p.

The standby power system shall include an automatic transfer switch according to UL 1008. Transfer switch shall be rated for 100 percent of full load and shall have short circuit current rating as indicated. Switch shall be provided with indicators for all phases of operation and be equipped with a fully programmable timer for exercising the equipment. Provide silver plated load contacts with arcing tips and arc extinguishing devices. Provide the transfer switch with an internal manual operator, with the same transfer speed as the electrical operator.

q.

Provide the automatic transfer switch with the following features:

1.

Full phase relay protection with three voltage sensing relays.

2.

Starting and load transfer to alternate source on a drop to 80 percent on any phase of normal voltage or one-Hertz frequency drop. Retransfer of load to normal source when voltage of all phases is restored to 90-95 percent.

3.

Transfer to standby generator when generator voltage and frequency are 90 percent of rated values

4.

Adjustable time delay, zero to two minutes, on transfer from alternate to normal. After transfer to the normal source, engine generator to run for adjustable time period to zero to five minutes before shutdown.

r.

Generator shall be load tested at 100 percent full load on site for a period of four hours using resistive load banks. Notify the authority inspector prior to test, and provide certification letter from the manufacturer. Perform functional transfer tests simulating loss and return of utility power.

s.

Three complete sets of O&M manuals and keys shall be provided for generator and automatic transfer switch.

t.

Generator control system must include a programmable control device (exerciser) to allow automatic start-up and test functions. Test functions can be programmed for daily, weekly or monthly testing. Connections for remote monitoring of function and failure must be provided.

u.

Pump stations are required to have continuous standby power. Generators shall be diesel powered with 100 gallons minimum fuel storage capacity or 24-hour operating time, which ever is greater. Fuel storage shall be accomplished by the use of corrosion-resistant double wall subbase fuel tank only; no underground storage will be allowed. A leak detection device shall be provided in the interstitial space for sensing fuel leakage. The device contact shall be connected to the generator control panel terminals for telemetry.

v.

Generators can be obtained from the following manufacturers:

1.

Cummins-Onan.

2.

Kohler.

3.

Approved equal.

w.

Generator manufacturer will provide a 60-month comprehensive warranty to include parts and labor.

x.

Provide the manufacturer recommended set of spare parts for the generator and the automatic transfer switch. These shall include, but not be limited to, one filter for each system, two spare injectors, fuel injection pump, one fuse of each rating, and two indicating lights of each type. Pack spare parts in suitable boxes, bearing label of the content and the equipment for which it is intended.

y.

Transfer switches shall be in a NEMA 4 X enclosure and shall be supplied by the generator manufacturer. Acceptable manufacturers are:

1.

Cummins-Onan.

2.

ASCO.

z.

A generator ground grid must be provided and connected to the pump station grounding system.

(17)

Monitoring system. Provide pump station with autodialer monitoring system in a NEMA 4X rated, stainless steel, wall-mounted enclosure complete with mounting hardware. Provide conduit stub for future telemetry connection.

(Ord. No. 404, att. A(§ 6, pt. 2), 7-1-2009)