20050067 Tahoma Terra - Special ReportsUTILITY INFRASTRUCTURE
SEWER:
The entire development will be served by City sewer and water. This project will be served by a
conventional gravity sewer collection system, a large S.T.E.P. tank and municipal effluent pump
station. Effluent from Divisions 1 and 2 will be pump via a 3" - 4" diameter force along
Longmire Street connecting to and existing 3" diameter effluent main.
When Division 3 comes on line a new 12" diameter effluent main will be installed along the
alignment of a new Tahoma Terra Boulevard/Killian Road extended to Highway 510 and on to
Cullen Road. A 14" diameter effluent main on Coates Road to Rotan Road and a 16" diameter
on Rotan Road to the treatment plant per Yelm sewer comp plan (see attached sewer map).
Another S.T.E.P. tank and effluent pump station may be installed on the west side of the creek to
serve Phases 3 through 9.
WATER:
Domestic Water:
Divisions 1 and 2 will be served by extending an existing 8" diameter domestic water line on
Longmire Road into the project site. Additionally a 10'' diameter line extension in the southeast
corner from Nisqually Estates will be needed.
Divisions 3 and beyond will require a new 10~' diameter water main extension from SR ~ 10 up
the new Killian Road/Tahoma Terra Boulevard. This 10" water main will connect to the
proposed line extensions on Longmire Road and Division 1 and 2 (see attached water map). It is
anticipated that a latte comers agreement would be used to recover some of the appropriate off-
site costs.
Reclaimed Water:
Tahoma Terra will be served throughout by Yelm's reuse water. Anew 12" diameter pipe
extension will be installed along the Killian Road/Tahoma Terra Boulevard into the project.
Tahoma Terra will use the water to irrigate open space and landscaped areas and possibly for
creek maintenance and ground water recharge.
POWER/GAS/TELEPHONE:
The project will also be serviced by power and natural gas by Puget Sound Energy (PSE).
Telephone and high speed Internet served by Ycom of Yelm. Anew switching station is planned
somewhere in the commercial area or community park area to accommodate Division 3 and
beyond.
TRANSPORTATION:
External and internal street improvements and mitigation are outlined in the Project Master Plan
and Transportation analysis.
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SANITARY SEWER
sv
7C LIFT STATIONS
WIAR 3 ®2005
7C.010 General
The need for a sewage lift station, as identified in the Wastewater
Comprehensive Plan or necessary for a development as determined
by the City, shall be presented by the Developer in a design report. If
the City determines the area cannot be served by gravity services
and is sized at 50 homes or more or in a gravity basin, the Developer
shall provide information and design the lift station to comply with
the following minimum standards.
7C.020 Design Report
If a lift station is determined to be necessary, the Developer shall
perform a study prepared and stamped by a Professional Engineer
licensed in the State of Washington, to determine that the lift station
installation is sized to serve the overall sewage flows generated
within the potential service area. The service area study shall
include the Developer's plat boundary area and may include adjacent
and future service areas as determined by the City. The final service
area shall be the entire area which could be served by the
installation of the lift station(s).
The design of any lift station shall conform to City of Lacey
standards, Department of Ecology's "Criteria for Sewage Works
Design" and applicable standards as set forth in herein and in
sections 3.020 and 3.040.
The station's design flow capacity shall be based on an average daily
per capita flow with related peaking factors and inflow/infiltration
allowances.
Documentation of present and future service area flow rates for lift
station size and capacity determination shall be included in the
report.
The effects of the minimum flow conditions shall be estimated to be
sure that retention of the sewage in the wet well will not create a
nuisance and that pumping equipment operation will be optimized.
The wet well shall be sized to provide full submergence on the pumps
as recommended by the pump manufacturer and a minimum, of four
(4) minutes between pump cycles at pump design capacity.
The lift station shall be sized to meet the maximum rate of flow
expected. The size of the receiving sewer shall also match the flow
expected. At least two (2) pumping units shall be provided at each
lift station installation. The pumps shall have sufficient capacity and
8/02 7 - 23
SANITARY SEWER
7C.030 Design Drawings
The drawings shall be prepared by a Professional Engineer licensed in the
State of Washington to an appropriate scale to show details of the site.
See Chapter 3.040 AutoCAD electronic files are available of the City
Standard Lift Station details. The Developer's Engineer shall revise the
drawings and review all dimensions to ensure accuracy for the applicable
site and pump selection. AutoCAD electronic files are also available of the
approved City of Lacey lift station electrical wiring diagrams.
The detailed engineering drawings shall accurately depict the equipment
selected by the Engineer. The drawings shall include an equipment list
showing manufacturer, model number, and size or capacity for all
structures, mechanical and electrical components.
The Developer shall furnish a site layout for the lift station installation.
The lift station shall be located as far as practicable from present and/or
proposed residential areas. Sites shall be of sufficient size for access,
maintenance and future expansion or addition, if applicable.
Lift station sites together with access to the site shall be deeded to the
City.
As a minimum, the following shall be provided on the plans for
construction:
1. Complete lift station
2. Auxiliary power
3. All electrical
4. Telemetry compatible with existing system, including complete start
up and revising existing screens at Lacey Operation Center.
5. 2-inch water service with DCVA assembly and wash down hydrant.
6. Odor control, as applicable for location and capacity.
7. Site soil conditions. Excavation, select backfill and compaction
requirements.
8. Cuts and fills to provide level site for maintenance.
9. Asphalt, concrete pavement for access.
10. Concrete within the maintenance area.
11. Landscaping per City of Lacey development criteria.
12. Seven-foot (7~ high fence enclosing the site and atwelve-foot (12~ wide
lockable access gate.
13. Address sign
14.Site lighting.
8/02 7 - 25
SANITARY SEWER
7. Electrical Service Specifications (service size, voltage, motor
size, enclosure type, etc.)
• Source of power
• Calculations
• Single line diagram
• Primary distribution equipment
• Service entrance
• Branch circuiting
. Mechanical equipment power requirements
• Control diagrams & schematics
• Schedules of fixtures, panel boards & switch
gear
• Shop drawings
8. Lighting Exterior lighting
9. Wet Well Size
• Storage capacity
• Access hatch
• Locking mechanism
• Penetration seals
• Safety entry equipment
• Safety net
• Manufacturer
• Corrosion protection, material, application,
warranty.
10. Valve Vault Size
• Access ladder
• Access hatch
• Penetration seals
• Manufacturer
11. Piping Size and material
. Valves
• Flow meter
• Bypass pumping fittings
• Pipe supports
• Corrosion protection, material,
application, warranty
12. Testing Plan Factory test
• Operational test & start up.
• Pressure test
• Start up 8v training
8/02 7 - 27
SANITARY SEWER
GENERAL NOTES (LIFT STATION INSTALLATION)
1. All workmanship, materials and testing shall be in accordance with the
most current WSDOT/APWA Standard Specifications for Road, Bridge
and Municipal Construction, National Electrical Code and City of Lacey
Development Guidelines unless otherwise specified below. In cases
conflict the most stringent standard shall apply. When the most stringent
standard is not clear, the City Engineer will make the determination. The
Electrical Contractor shall be familiar with all above stated publications
and guidelines as they will be strictly enforced by the City.
2. Any changes to the station design shall first be reviewed and approved by
the project engineer and the City of Lacey.
3. Contractors shall be responsible for cleanup of any debris in the wet well,
tanks, vaults and site associated with the project prior to start up.
4. Prior to backfill, all mains, tanks, wet well and vaults shall be inspected
and approved by the City of Lacey Construction Inspector. Approval shall
not relieve the contractor for correction of any deficiencies and/or failures
as determined by subsequent testing and inspections. It shall be the
contractor's responsibility to notify the City of Lacey for the required
inspections.
5. All work shall be done per National Electrical Code (N.E.C.) and The City
of Lacey Standards. The City of Lacey Standards may exceed the N.E.C.
The Developer shall obtain all permits and arrange inspections.
6. The Developer shall coordinate power service with serving utilities and
make arrangements for power service connection. It shall be the
Developers responsibility to maintain power service for lift stations
serving commercial properties or developments.
7. Prior to testing and start-up of the lift station, five (5) copies of the
Operation and Maintenance Manual, together with the number of
approved copies required by the Developer, shall be submitted to the City
for review and approval.
8. The Developer, at its own expense with the Design Engineer, shall
arrange for an authorized factory-trained representative of the company
or companies supplying the various items of equipment to check the
installation, adjust and test the equipment furnished before the
acceptance of the work by the City. The factory representative shall be
responsible to check and resolve any unacceptable vibration of the pump
assemblies. Furthermore, the Developer shall assist and instruct the
City's operating staff in adjusting and operating the equipment during
the initial start-up period. Said representative shall be experienced and
knowledgeable of the equipment being tested.
8/02 7 - 29
SANITARY SEWER
17. Spare parts shall be provided for the station at time of start up
acceptance.
• One set mechanical seals.
• One set of O-rings.
• One set of pump wear rings.
Additionally, any special tools specific to the pump manufacturer shall be
provided to the City of Lacey at start up.
Revised: August 6, 2002
ww/ dev07
8/02
7-31
SANITARY SEWER
Rectangular cross-sectioned gaskets requiring specific torque
limits to achieve compression shall not be considered as adequate
or equal. No secondary sealing compounds, elliptical O-rings,
grease or other devices shall be used.
Cable Entry Seal:
The cable entry seal designs shall preclude specific torque
requirements to insure a watertight and submersible seal. The
cable entry shall consist of a single cylindrical elastomer grommet,
flanked by washers, all having a close tolerance fit against the
cable outside diameter and the entry inside diameter and
compressed by the body containing a strain relief function,
separate from the function of sealing the cable. The assembly
shall provide ease of changing the cable when necessary using the
same entry seal. The cable entry junction chamber and motor
shall be separated by a terminal board, which shall isolate the
interior from foreign material gaining access through the pump
top.
Motor:
The pump motor shall be explosion proof, induction type with a
squirrel-cage rotor, shell type design, housed in an oil or air-filled,
watertight chamber, NEMA B type. The stator windings and stator
leads shall be insulated with moisture resistant, Class F,
insulation rated for 155°C (311 °F). The stator shall be dipped and
baked three times in Class F varnish and shall be heat-shrink
fitted or mechanically fastened into the stator housing. The motor
shall be designed for continuous duty handling pumped media of
40°C (104°F) and capable of ten (10) to fifteen (15) evenly spaced
starts per hour. The rotor bars and short circuit rings shall be
made of cast aluminum. Thermal switches set to open at 140°C
(250°F) shall be embedded in the stator lead coils to monitor the
temperature of each phase winding. These thermal switches shall
be used in conjunction with and supplemental to external motor
overload protection and shall be connected to the control panel.
The junction chamber shall be hermetically sealed from the motor
by an elastomer O-ring seal. Connection between the cable
conductors and stator leads shall be made with threaded
compression type connectors. The motor and pump shall be
designed and assembled by the same manufacturer.
The combined service factor (combined effect of voltage, frequency
and specific gravity) shall be a minimum of 1.15. The motor shall
have a voltage tolerance of plus or minus 10% (± 10%). The motor
shall be designed for operation up to 40°C (104°F) ambient and
with a temperature rise not to exceed 80°C (176°F).
8/02 7 - 33
SANITARY SEWER
Cartridge type systems shall be acceptable. No system requiring a
pressure differential to offset pressure and to effect sealing shall
be used. Proprietary seals shall not be allowed.
Each pump shall be provided with an oil chamber for the shaft
sealing system. The oil chamber shall be designed to prevent
overfilling and to provide oil expansion capacity. The drain and
inspection plug, with positive anti-leak seal shall be easily
accessible from the outside. The seal system shall not rely upon
the pumped media for lubrication. The motor shall be able to
operate dry without damage while pumping under load.
Pump Shaft:
Pump and motor shaft shall be the same unit. The pump shaft is
an extension of the motor shaft. Couplings shall not be
acceptable. The pump shaft shall be AISI type 430F stainless
steel.
Impeller:
The impellers shall be of gray cast iron, Class 40B, dynamically
balanced, double shrouded non-clogging design having a long
throughlet without turns. The impellers shall be capable of
handling solids, fibrous materials, heavy sludge and other matter
found in wastewater. Whenever possible, a full vaned or vortex
impeller shall be used for maximum hydraulic efficiency; thus,
reducing operating costs. Mass moment of inertia calculations
shall be provided by the pump manufacturer upon request. The
impellers shall be keyed to the shaft, retained with an Allen head
bolt and shall be capable of passing a minimum 3-inch diameter
solid. Impeller wear rings shall be replaceable bronze ASTM B 144.
Wear Rings:
A wear ring system shall be used to provide efficient sealing
between the volute and suction inlet of the impeller. Each pump
shall be equipped with a replaceable bronze ASTM B 144 wear ring
insert fitted to the volute inlet.
Volute:
Pump volute(s) shall be single-piece gray cast iron, Class 40B,
non-concentric design with smooth passages large enough to pass
any solids that may enter the impeller.
8/02 7 - 35
SANITARY SEWER
The wet well shall be designed for the soil conditions on the site
including soil bearing conditions and ground water levels. Ladder
rungs shall not extend below the high water level line.
The valve vault shall be a pre-cast utility vault as manufactured
by Utility Vault, Inc. Provide solid walls without knockouts, but
with pre-cut holes for pipe penetrations. All pipes shall be grouted
in place with non-shrink grout. Vault shall have floor with drain
sump and drain line back to wet well with a inline check valve and
in line trap to prevent odors from entering the vault.
The access hatches shall be hinged, spring-assisted hatches
designed for H-20 loading. The hatch for the pump station shall
be the size recommended by the pump manufacturer but shall be
no less than (2) 36" x 36" minimum clear inside opening. The
hatches for both the wet well and valve vault shall be by the same
manufacturer and shall be Halliday Products or approved equal.
The access hatch shall include a written manufacturer's guarantee
to seal out all offensive odors completely.
The inside of the wet well shall be coated completely to prevent
corrosion.
Wet Well Coating:
The wet well coating material shall be ISO 9000 certified hi grade
calcium aluminate, LaFarge Sewper Coat HS 2000 or approved
equal.
The product shall be installed in accordance with the
manufacturer's instructions by a factory certified applicator.
The wet well shall be thoroughly pressure washed using a
minimum of 3,000 psi in preparation for the application to remove
any dirt, debris or loose material.
The sprayed-on material shall be applied to completely and
uniformly cover the wet well concrete floor, walls and underside of
lid a minimum of one (1) inch in thickness. Finished surface shall
be smooth.
All manhole joints and pipe penetrations shall be watertight to
prevent infiltration or ex-filtration of the wet well prior to
application of the product.
8/02 7 - 37
SANITARY SEWER
The pump control and electrical equipment shall be factory manufactured
and field installed. It shall be fabricated and assembled by an approved
U.L. 508 listed manufacturer.
Pump Station Telemetry & Controls:
Duplex Pump Control Function: The two submersible pumps shall
operate in a duplex mode. Each pump shall be provided with aHAND-
OFF-AUTO selector switch which shall control the pump as follows:
1. Hand Position: When the HOA switch is placed in the HAND position,
the pump shall immediately start and run until HOA switch is placed
in the OFF position. Pumps shall not be controlled by level sensors
when the HOA switch is in the HAND position.
2. OFF Position: When the HOA switch is placed in the OFF position, the
pumps shall immediately stop, regardless of the water level.
3. AUTO Position: When the HOA switch is placed in the AUTO position,
the pumps shall start and stop automatically in response to the water
level and in the sequence determined by the controller. One pump shall
start as the lead pump when the water level rises above the Lead Pump-
On level. The pump shall run continuously until the water level decreases
to the Pump-Off level. When both pumps are called to run, the lag pump
will be set to shut off at a point 10% before to the lead pump shut off.
Pump Running Indication: Provide indicating lights (green) that shall
indicate the pump running condition. The light shall glow steadily when
pump is running and shall be turned off whenever the pump is not
running. In addition, provide contacts for remote monitoring of pump
operation.
Alarms: Alarms shall be reported locally at the control panel and contacts
provided for remote alarms. In the event of an alarm, individual indicating
alarm lights on the pump control panel shall be lit to pinpoint the specific
trouble. The alarm contact wiring shall be complete to the telemetry box
as per Technical Systems Incorporated (TSI) instructions for landing.
8/02 7 - 39
SANITARY SEWER
6. Selector switches shall be 3-position maintained type meeting NEMA
Type 13 requirements. Legend plate shall be marked HAND-OFF-
AUTO. Selector switches shall be provided with a padlock attachment
(so that switch can be locked in the OFF position),
7. Provide for each starter a fused control circuit transformer with two
fuses in the primary and one fuse in the secondary.
8. Panel wiring shall be Stranded Type XHIHW or SIS rated 90°C with a
minimum size of No. 14 AWG. Compression or ring tongue type lugs
shall be used for transformers. Wires crossing hinges shall be
installed in a manner to prevent chaffing. Plastic wire gutters and
nylon cable wrap and wires shall be used to guide and train the wire
as necessary.
9. Space shall be provided for TSI telemetry. This space shall be a
minimum of 16" x 14" x 8". The telemetry unit shall be provided and
installed per specification as required by the City and George Nelson,
TSI. Telemetry shall be operational prior to station acceptance.
10. Main disconnect and transfer switches shall be mounted in the
enclosure.
11. Radio mast and weather head for telemetry shall be 1 '/a" PVC coated
rigid conduit with a tee condelet mounted at the point where antenna
cable penetrates cabinet with a Myers hub type watertight connection.
All connections exposed to weather shall be heat shrunk. A Uni-Strut
support bar shall be mounted at a 45 degree angle to the mast and
cabinet for extra support. All mounting hardware shall be 316 stainless
steel.
High Level Sensors: Level sensors shall be a float switch type utilizing a
mercury switch mounted in a chemical resistant casing suspended on its
own cable. If the sensor comes in contact with the rising liquid level, the
sensor shall tilt and cause the internal mercury switch to close its contact.
The sensor shall stay tilted until the liquid level decreases below the sensor.
The level sensor shall be designed for intrinsically-safe low power
applications. The cable shall be 45 feet long. Sensor shall be provided for
high level alarm.
The following list of approved materials shall be shown on the plans and
include brand name, model and part numbers.
8/02 7 - 41
. SANITARY SEWER
T. Manual Transfer switch -Cutler Hammer or Square D, knife style
U. Elapsed Time Meter -Yokogawa 240211AAAB
V. Amp Meters -Yokogawa
W. Receptacle - Leviton 20A - 120V GFCI with weatherproof cover.
X. Level Controller - Miltronics Hydroranger 828711, XPS-10 transducer,
Key pad 69900007. (no splice allowed in cable).
Y. UPS Back Up - Solal Heavy Duty
Z. Transformers - Solal Heavy Duty
AA.Power Supply -Power 1 International Power
BB.Terminal Blocks - Entrelec M 4/6 5116
Radio Telemetry:
A. Enclosure -Hoffman
B. Corrosion Inhibitor -Hoffman A-HCI-1 DV
C. R.T.U. Base Card -Autocon 9701
D. Radio Modem -Autocon 9513
E. Analog Expansion Card -Autocon 212D 12B2
F. Expansion Card D.I. -Autocon 9542
G. Power Converter -Power One or CDF do to dc.
H. Battery -Gel Cell Panasonic
I. UHF Radio - EF Johnson 2 Watt 3472
J. UHF Antenna -Larson YA-1-450PL
All penetrations made to panels, breaker boxes, soft starts, etc. shall be made
with water tight fittings such as a Myers hub.
8/02 7 - 43
SANITARY SEWER
The generator set shall include the following:
Engine:
• Single phase, 1500 watt coolant heater manufactured by KIM -hot shot
115 volt or 240 volt sized accordingly for the engine and climate
conditions.
Generator Set:
• Mainline circuit breaker
• Weather-protective/sound dampening enclosure with mounted silencer
(maximum noise level of 68 dBA at 23 feet).
• 5-year basic power warranty.
Accessories:
• Batteries
• Battery Charger, 2 AMP, 12 VDC, 120 VAC Input
• Vibration Isolators, Pad Type
Control Panel:
• Annunciator relays (12)
• Run relay package (3)
• Low coolant level shutdown
• Anti-condensation space heater, 120 VAC
• Oil temperature gauge
• Wattmeter
• Emergency stop switch
Ftiiel System:
• Diesel
Alternator:
• Anti-condensation heater, 120 VAC
Exhaust System:
• Exhaust silencer (68dBA AT 23 feet)
8/02 7 - 45
SANITARY SEWER
Application:
• Application -Utility to Genset
System Operation:
• Three-phase, 3-wire or 4-wire
Enclosure:
• B002 Type 3R; Intended for outdoor use (dust proof and rainproof) Shall
have radiator grill protection or automatic louver system.
Listing:
• Listing - UL 1008
Programmed Transition:
• Program Transition - 1-60 sec.
Exerciser Clock:
• 7-day solid-state exerciser clock
Application Modules:
• Monitor -Phase Sequence/Balance
Suitable guards shall be provided on all electrical parts to minimize the
personal shock hazard.
Generator shall be broken-in sufficiently to permit application of full load
immediately upon installation.
Generator supplier shall provide all tools for the generator set as
recommended and required by the manufacturer.
Generator installation shall be checked by the supplier after installation to
determine that the installation is correct. Written confirmation shall be
provided to the City. Generator supplier shall perform a full load test for
two (2) hours after installation is complete. Provide resistive load bank for
this test.
Generator supplier shall provide a minimum of four (4) hours of training for
City personnel at the station site during start-up.
8/02 7 - 47
SANITARY SEWER
LIFT STATION INSPECTION CHECKLIST
Inspectors:
Date:
Name of Lift Station:
Location:
Address:
Assigned Lift Station Number:
OPERATION OKAY
Yes No
Control Panel components:
Ultrasonic level instrument
Pump Run Lights:
Hour Meters:
H.O.A.:
Limit Switches:
Panel wiring
Grounding
UPS
Power supplies
Legend Plates
Markings and Identifications
Comments:
Alarm Functions:
Power Fail:
High Wet Well:
Low Wet Well:
High High Wet Well
Control Overide
Intrusion
Pump Functions:
Pump # 1 Fail
Pump #2 Fail:
8/02 7 - 49
SANITARY SEWER
Load Centers:
Comments:
Electrical cabinet Heater Operation:
Comments:
Disconnect Operation:
Comments:
Auxiliary Generator Operation:
Comments:
Transfer Switch Operation:
Comments:
Isolation Valves Operation:
Comments:
Check Valve Operation:
Limit Switches:
Comments:
Emergency Bypass Operation 8v Fittings:
Comments:
All Nuts, Bolts and Anchors to spec., grade and in place:
Comments:
All Mechanical Components Installed in Wet Well:
Comments:
Wet Well Piping for Proper Size:
Comments:
Corrosion Resistant (epoxy coating wet well pipes):
Comments:
Calcium Aluminate Coating in Wet Well:
Comments:
Flow Meter:
Comments:
Note: Check that motors are not exceeding their nameplate amperage multiplied
by the motor service factor, (i.e., with FLA = 10 and SF = 1.15, the amperage
recorded should not exceed 11.5 amps). The motor will operate satisfactorily
under the following conditions of voltage and frequency variation, but not
necessarily in accordance with the standards established for operation
under rated conditions.
8/02 7 - 51
SANITARY SEWER
Motor Data: HP RPM
Volt
Comments:
Pump Design in gallons per minute: # 1
# 1 , #2 and #3 TDH _
Comments:
Pump performance during startup in gallons per minute: # 1
#3 #1, #2 and 3 TDH
Comments:
Hour Meter Readings: # 1
Comments:
#2
Pump #1 Running Amps: Ll
Pump #2 Running Amps: L1
Pump #3 Running Amps: L1
Actual Wet Well Pump down and fill levels:
High Water:
Fill Level:
Pump Down:
Phase Cycle
#2
#2 #3
#3
L2 L3
L2 L3
L2 L3
8/02 7 - 53
SANITARY SEWER
Other Comments:
Inspectors Signature of Acceptance
Project Inspector:
Shop Operations:
Date:
Date:
8/02 7 - 55
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Standard City of Lacey Submersible Lift Station
Unsite
Photograph #1
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Control Cabinet Enclosure for Community S.T.E.P. System -
with Onsite Generator and Telemetry Photograph #2
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Control Cabinet Enclosure for 10 to 16 home Community S.T.E.P. System
(With Radio Telemetry, No Onsite Generator) Photograph #3
• Control Cabinet Enclosure for 3 to 9 home Community S.T.E.P. System
(No Radio Telemetry, No Onsite Generator)
Photograph #4
Alarm light
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receptacle #ADR 1044R5,
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S.T.E.P. Lot Connection for Single Family and Duplex Family
Systems
_ _ ~ .. ~. ..~. _ -_ 11" Kmg=Brothers --~--
1"threaded ~~ l %"x I" . modelI~.SC 1000 ~.,
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