HomeMy WebLinkAboutOff-Site Wastewater System Analysis OFF-SITE WASTEWATER
SYSTEM ANALYSIS
FOR
INDIAN LAKES SUBDIVISION
PHASE IX
COLLEGE STATION, TEXAS
January 2006
MBESI# 1062-0012
N & McCLURE & BROWNE ENGINEERING/SURVEYING, INC.
—
1008 Woodcreek Drive,Suite 103•College Station,Texas 77845
(979)693-3838•Fax:(979)693-2554•Email:McClureBrowne@Verizon.net
WASTEWATER ANALYSIS
FOR THE OFFSITE SYSTEM SERVING
VILLAGES OF INDIAN LAKES, PHASE 9
AND AJOINING TRACTS
General Information
Area served: 1) 11.1 acres in Indian Lakes Ph 9 (44 lots)
2) 35 acres in future phases of Indian Lakes
3) Potential to serve 27 existing lots in Nantucket
4) 128.6 acres in undeveloped tracts adjacent to Nantucket
Anticipated land use: Single family residential
Notes on surrounding development: Most development around this site consists of 1-3 acre lots in
Nantucket and Indian Lakes. While it is anticipated that future
development in the sewer area will be much like the existing
development, the assumption for this analysis is that medium
density development will be constructed.
Sewer System Analysis
Primary outfall line: 12"Line in the Nantucket Subdivision currently under construction
Software model: Microsoft EXCEL Spreadsheet based on Manning's Equation
Average daily flow: 267 gpd per residential lot
Development density: 3 lots per acre for all undeveloped,unplatted land
Peaking factor: 4.0
Pipe Material: PVC (D3034 and D2241)
Manning's N value: 0.013
Spreadsheet Notes: The spreadsheet in Exhibit B analyzes the gravity system for Indian Lakes Phase
9 and the outfall system adjacent to the Nantucket Subdivision that is being
constructed in conjunction with the development. It computes the anticipated
flowrates from each sewer area and the minimum slopes of the lines that serve
those areas. It compares the computed slope with either the required minimum
slope or the design slope from the plans. If the computed slope is less than the
minimum or the design slope,the spreadsheet indicates the line is "OK".
Conclusion: All of the lines in the spreadsheet on Exhibit B indicate they are OK and
thus meet the design guidelines of the Cities of Bryan and College Station.
Therefore, we conclude that the lines are adequately sized and will easily
carry the sewage flows that are expected to pass through them.
Applicable Exhibits: �— E OFT by
Exhibit A Schematic Sewer System Layout(offsite lines only) 5�P......•....F'rgsll�
Exhibit B Sewer Model Spreadsheet $*•' o
Exhibit C Lift Station and Force Main Report f""' .........................`••'N
Exhibit D Copyof Letterp f;a.:• Y L.ROBERTSON
to TCEQ � 'o��� •9445 !t
Ith�CONAL EAG r
/ 126/04
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er System
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EXHIBIT C
Lift Station and Force Main Report
Indian Lakes Offsite Sewer System
MBESI#10620012
LIFT STATION #1
ENGINEERING REPORT
FOR
INDIAN LAKES, PHASE IX
PREPARED FOR:
Clarke & Wyndham
3608 East 29th Street
Bryan, Texas 77802
PREPARED BY:
McCLURE & BROWNE ENGINEERING/SURVEYING, INC.
1008 WOODCREEK DR.
College Station, Texas 77845
e
-Poof ‘N
-Poe
January, l
II
2006
•
MBESI No. 10620015 i JEFFERY L.ROBERTSON
-o 94745
VC:\. </CENSE /$1
INDIAN LAKES, PHASE IX LIFT STATION #1
JANUARY 2006 ENGINEERING REPORT
■jaiIkI.IJ J. A 1,WL!I.. «.aiVflI . .,x,. .,_.ie..'....,.. w.. ..w .:.r..
The following calculations will illustrate that the construction of Lift Station #1 for Indian Lakes
Subdivision, Phase IX is designed in accordance with Texas 30 TAC §317.3 "Lift Stations"
requirements.
§317.3. Lift Stations.
§317.3.(a) Site selection
The 100-year flood plain was determined by the use of the USGS Quadrangle map and
FEMA Flood Plain Map for the area surrounding the project site. The proposed lift station
(LS) is not within or near the 100-year flood plain. Therefore the top-of-slab elevation is
above the 100-year flood elevation. The existing lift station slab is approximately 1'-6"
above the existing surrounding ground.
§317.3.(b) Design
§317.3.(b)(1) Small Lift Stations
The proposed lift station shall consist of two grinder pumps capable of pumping 40 g.p.m.,
and associated appurtenances.
§317.3.(b)(2) Dry Well Sump Pumps - Not Applicable
§317.3.(b)(3) Pump Controls
The LS will be controlled with float switch controls that will activate the appropriate pump.
All controls for the lift station will be located in a control box as shown in the drawings.
§317.3.(b)(4) Wet Wells
§317.3.(b)(4)(A) Wet Wells and Dry Wells.
The proposed wet well shall be constructed of reinforced concrete pipe. The interior shall
be coated with a compound that will deter the migration of wastewater through the wet well
walls.
-2-
INDIAN LAKES, PHASE IX LIFT STATION #1
JANUARY 2006 ENGINEERING REPORT
§317.3.(b)(4)(B) Pump Cycle Time
The pump cycle will be at least six minutes. Refer to Attachment#2 - Lift Station Design
Calculations for pump cycle time based on design flow.
§317.3.(b)(4)(C) Influent Gravity Lines
The proposed influent gravity line is approximately 11.21'below the proposed finished slab
elevation. Therefore, the pumps will be set to keep the wastewater elevation in the lift
station as low as possible.
The first pump will be set to come on when the wastewater elevation in the wet well is at
247.00'. The second pump will come on once the wastewater elevation reaches 247.75'.
The HWL will be set at 252.80', which will trigger an alarm.
§317.3.(b)(5) Stairways - Not Applicable
§317.3.(b)(6) Ventilation
The LS will be closed at all times. The wet well shall be piped with a passive ventilation
system that will allow gases to be expelled from the wet well.
§317.3.(b)(6)(A) Passive Ventilation
A 4"welded steel pipe(W.S.P.)gooseneck vent shall be installed in the section of the wet
well that will be covered to prevent the buildup of gases.
§317.3.(b)(6)(B) Mechanical Ventilation - Not Applicable
§317.3.(b)(7) Wet Well Slopes
The bottom of the wet well shall be grouted to create a slope from the wall to the
submersible pumps to discourage the buildup of solids on the floor of the lift station.
§317.3.(b)(8) Hoisting Equipment
A hoist shall be installed as part of the LS to assist in the removal of the submersible
pumps and appurtenances.
§317.3.(b)(9) Dry Wells and Valve Vault Drains - Not Applicable
-3-
INDIAN LAKES, PHASE IX LIFT STATION #1
JANUARY 2006 ENGINEERING REPORT
§317.3.(c) Pumps
§317.3.(c)(1) General
The pumps shall be non-clog submersible pumps with the capability of passing 2 1/2-inch
diameter sphere and 2.5"o discharge openings. The submersible pumps shall be mounted
on a rail-type support system as supplied by the manufacturer. The operator will be able
to remove and replace any single pump without entering or dewatering the wet well.
§317.3.(c)(2) Lift Station Pumping Capacity
The design flow into the lift station capacity is calculated to be as follows:
Average Daily Flow = 13,200 GPD (9 g.p.m.)
Peak Inflow = (27.5 g.p.m.)
Refer to Attachment#2 - Lift Station Design Calculations for additional information
regarding these flows.
Each of the two pumps will be capable of pumping 40 g.p.m. with the largest pump out
of service.
§317.3.(c)(3) Variable Capacity Pumps - Not Applicable
§317.3.(c)(4) Pump Head Calculations
Refer to the Attachment#2 - Lift Station Design Calculations for pumping head
calculations.
§317.3.(c)(5) Self-priming Pumps - Not Applicable
§317.3.(c)(6) Pump Positioning - Not Applicable
§317.3.(c)(7) Grinder Pumps
Grinder Pumps are used as required by §317.3.(b)(1)
§317.3.(d) Piping
§317.3.(d)(1) Pump Suctions
A low level lock out will be installed in the wet well to prevent the pumps from running
dry. A float switch will be set 24" above the bottom of the finished floor of the wet well.
-4-
INDIAN LAKES, PHASE IX LIFT STATION #1
JANUARY 2006 ENGINEERING REPORT
§317.3.(d)(2) Valves
Gate valves and rubber ball check valves will be provided for each pump.
§317.3.(d)(3) Valve Position Indicators
All valves will have external position indicators.
§317.3.(d)(4) Lift Station Piping
All piping will be ASTM D2241, SDR 26, PVC piping. Discharge piping velocity for
each pump is as follows:
Pumps Discharge Piping Pump Capacity Discharge Velocity
(in.) (g.p.m.) (FPS)
1 2.5 40 2.61
2 2.5 40 2.61
The pumps should not run in parallel based upon projected influent
flows and pump capacity.
All discharge velocities will be greater than 2.0 FPS.
§317.3.(d)(5) Force Main Pipe Selection
The proposed force main is 2.5"o ASTM D2241, SDR 26 PVC pipe. Under normal
operating conditions, the pumps will discharge ±40 g.p.m. for future operating once complete
development of the area occurs. From previous calculations, the velocity in a 2.5"e pipe will
be 2.61 FPS for a 40 g.p.m. capacity, which is greater than the required 2.00 FPS.
§317.3.(d)(6) Force Main Tests
The final plans and specification will indicate the testing pressure to be 1.5 times the
maximum design pressure. The testing pressure for the force main will be 100 p.s.i.
§317.3.(d) (7) Air Release Valves -
Air Release valves will be installed at high points in force main alignment
-5-
INDIAN LAKES, PHASE IX LIFT STATION #1
JANUARY 2006 ENGINEERING REPORT
§317.3.(e) Emergency Provisions
The proposed lift station shall be designed such that there is not a substantial hazard
of stream pollution from overflow or surcharge onto public or private property with sewage.
Additional emergency provisions are necessary.
§317.3.(e)(1) Power Supply
Refer to the Attachment#2 - Lift Station Design Calculations for power outages at the
lift station site and the wet well sizing based on the power outages.
§317.3.(e)(2) Alternative Power Supply
§317.3.(e)(2)(A) Electrical Service from two separate commercial power companies, provided
automatic switch over capabilities are in effect - Not Applicable.
§317.3.(e)(2)(B) Electrical service from two independent feeder lines or substations of the
same electric utility, provided automatic switch over capabilities are in effect
- Not Applicable.
§317.3.(e)(2)(C) On-site automatic starting electrical generators shall be provided for
emergency provisions to prevent "overflow". - Not Applicable
§317.3.(e)(2)(D) Reliance on Portable Generators or Pumps -A quick connect to the force
main line will be provided. Additionally, an auto-dialer will be installed and
programmed to call the City's wastewater treatment plant to alert the operator during an
emergency.
§317.3.(e)(3) Restoration of Lift Station - Not Applicable.
§317.3.(e)(4) Spill Containment Structures - Not Applicable
§317.3.(e)(5) Alarm System
The LS will be equipped with an audio-visual alarm system (red flashing light and horn)
at the site. The LS will also have an telephone connection that will trigger an alarm at
the City's wastewater treatment plant, which is attended 24 hour a day. The alarm
system will be activated on the high level is reached. Refer to the Attachment#2 - Lift
Station Design Calculations for alarm elevations.
-6-
INDIAN LAKES, PHASE IX LIFT STATION #1
JANUARY 2006 ENGINEERING REPORT
ATTACHMENT #1
General Location and FEMA Flood Plain Map
-7-
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PROPOSED LIFT STA710N
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` EXHIBIT 1
Flood Insurance Rate Map Excerpt
Brazos County, Texas
and Incorporated Areas
Map Numbers: 48041CO215C
N.T.S. Effective Date: July 2, 1992
INDIAN LAKES, PHASE IX LIFT STATION #1
JANUARY 2006 ENGINEERING REPORT
ATTACHMENT #2
Lift Station Design Calculations
Indian Lakes, Phase IX January 2006
Design Calculations
Lift Station Flood Proofing
FEMA map Panel #48041 CO215 C shows that the proposed lift station site is located outside of
the 100-year flood plain. Based on field surveys, the ground elevation at the proposed site is
±263.2, the proposed slab will be set at an elevation of±265.0.
Lift Station Analysis
> Lift Station Inflow
The proposed lift station will provide service to 44 residential lots with an assumed capacity of
3 persons per lot. Based upon Figure 1: 30 TAC §317.4(a), a wastewater flowrate for the
proposed residential development is approximately 100 gal/day/person. The future total average
daily inflow is calculated to be
Average Daily Inflow = 13,200 g.p.d. (9.17 g.p.m.)
Peak inflow will be take as 3 times the average daily inflow:
Peak Inflow = 27.5 g.p.m.
Wet Well Sizing
TCEQ regulations §317.3 (b)(1) states that lift station pumping capacity of less than 100
g.p.m. shall be only for institutional use or other locations where it is necessary to pump the
sewage from a single building, school, or other measurable source establishment. Grinder
pumps shall be used by all small installations.
TCEQ regulations § 317.3 (c)(2) requires that a lift station must be capable meeting the
expected peak inflow with the largest pump out of service.
Therefore, the pumping capacity of the lift station will be:
Pumping Capacity = 40.00 g.p.m.
TCEQ regulation §317.3(e)(1) requires a minimum storage capacity equivalent to the longest
power outage in the last 24 months, or 20 minutes, whichever is longer if records are
available. TCEQ regulation §317.3(e)(2)states that if its determined that power is unreliable,
alternate power supplies or options may be provided to ensure that lift station will not overflow.
Refer to the outage records from the power company that will be supplying electricity to the
site. There were four recorded outages on the circuit trunk in which power would be acquired
-1-
Indian Lakes, Phase IX January 2006
Design Calculations
since September 2003.The longest power outage was for 5 hours, 22 minutes. Based on this
outage, the power supply is considered to be unreliable. A portable pump and a quick
connection to the force main will be provided to ensure that the lift station will not overflow.
To determine the minimum storage capacity for the lift station, the longest power outage will
be used, which is 5 hours, 22 minutes (i.e. 322 minutes).
Using the following information, the volume of the lift station is calculated:
Cross Sectional Area for 6'8 Wet Well = 28.27 SF
Cross Sectional Area for 6"o Sewer Line = 0.20 SF
Cross Sectional Area for 4'o Manhole = 12.57 SF
F.L. Lowest Gravity Line = 253.79'
Top of Lift Station =265.00'
Bottom of Lift Station = 244.50'
Emergency Required Storage (Not including 2' dead volume):
322 min. x 9.17 g.p.m. (average daily flow) = 2,953 gallons
Storage in wet well:
[(16.50 VF x 28.27 SF) x 7.48 g/cf= 3,489 gallons
Storage in 6"o Sewer Line (SE-2):
[(710 LF x 0.20 SF) x 7.48 g/cf= 1,062 gallons
Storage in 4'e Manhole:
[(10.97 VF x 12.57 SF) x 7.48 g/cf= 1,031 gallons
The maximum height of the wastewater in the wet well at 263.00, which is 1' below the finished
floor elevation of the lowest habitable building connecting to this system.
The total amount of storage available in the wet well and collection system is 5,582 gal. This
provides more than enough storage for a 5 hour, 22 minute power outage, which is the greatest
power outage since September 2003.
Total storage Capacity (Emergency) = 5,582 gallons
Cycle Time Storage Requirements
TCEQ requires 6 minutes cycle time (min.) for submersible pumps, 10 minute cycle time is
preferable:
-2-
Indian Lakes, Phase IX January 2006
Design Calculations
V V
T = (Q _ S) + S
where: T = Cycle Time (min.)
V = Wet Well Storage
Q = Pumping Rate (40 g.p.m.)
S = Influent Rate (9.17 g.p.m.)
Therefore, the Wet Well Volume is:
V= 70.7 gallons
The minimum amount of time a pump should run is 3 minutes. Therefore, the volume required
to achieve 3 minute run time is:
V = 3 min. x 40 g.p.m.
V= 120 gallons
Therefore, Cycle Time at peak flow:
T= 120.00 120.00
(40-9.17) + 9.17
T = 17.0min. > 10min. ✓ OK
➢ Water Level Settings
Low Water Level (LWL) - Low water level will be taken as proposed floor plus 2', therefore:
LWL = 246.50'
First pump on is 0.5' higher than LWL, therefore:
First Pump On = 247.00'
Second pump on will be set 0.75' higher than First Pump On, therefore:
Second Pump On = 247.75'
-3-
Indian Lakes, Phase IX January 2006
Design Calculations
High Water Level (HWL) - If both pumps are running and wet well water elevation continues
to rise, HWL for alarm will be set 1.0 foot below the lowest incoming gravity line, therefore:
HWL = 252.80'
See attached sketch for profile view of lift station.
➢ Force Main Sizing
The proposed force main will be 2.5" ASTM D2241, Class 160 PVC, which as an inside
diameter of 2.606". The minimum velocity in the force main is 2 feet per second (fps) as
per current TCEQ regulations §317.3(d)(5).
Velocity = 0.4085
d
where: Q = Flow Rate (40 g.p.m.)
d = Diameter (2 in)
Velocity = 2.61 fps ✓ OK
➢ System Curve
Given:
LWL = 246.50'
HWL = 252.80'
Maximum Elevation = 291.33'
Worst Case Static Head: 291.33 - 246.50 = 44.83'
Best Case Static Head: 291.33 - 252.80 = 38.53'
See following pages for friction loss calculations and system curve.
> Specifications for Pumps
Proposed Grinder Pump is "Zoeller" 7110 Reversing Series Grinder Pump
Pump #1 & #2
Grinder pump, 3,450 rpm, 3.0 HP, 3 Ph, 480 V
Pump Data: 40 g.p.m. @ 39' TDH
Shut Off Conditions: 10 g.p.m. @ 63' TDH
-4-
INDIAN LAKES, PHASE IX LIFT STATION #1
JANUARY 2006 ENGINEERING REPORT
ATTACHMENT#3
Power Outage Records
Lou ic.OV rAA ara tint 5795 BTU
002/004
BRYAN TEXAS UTILITIES
rrF' >
` 4 ifi 4"t' P.O.Box 1000
D `Y I c fit Bryan,TX 77805
i- °; M": Phone: 979-821-5700
Sr: Fax: 979-821-5795
'' http://www.btutiiities.corn
* * ,. ;(
THE ENERGY TO SERVE YOU SINCE 1919
September 16, 2005
Jeff Robertson, P.E.
McClure&Browne Engineering/Surveying, Inc.
1008 Woodcreek Dr.
College Station, Tx 77845
Dear Jeff,
In response to your request for the number of outages that have occurred in the past 24
months and the length of time for each outage in the area bordering the Indian Lakes
area, I have attached the detailed list that contains the requested information. As you can
see from the outage report, it contains the date of the outage, the time of the outage, the
time the outage was restored and the number of customers affected. Most of the outages
were small affecting only a few customers owing to our fusing of all taps off the main
feeder circuit, which serves to isolate problems and keep power flowing to as many
customers as possible.
If you have any questions regarding this information of if you need additional
information,please contact me at(979) 821-5824.
Sincerely,
at71,4,41 /02 . CWit,,,, ,,- .
Ronnie Wiggins
Supervisory Operator
Electric Transmission
Bryan Texas Utilities
Received Time Sep. 16. 12: 31PM
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INDIAN LAKES, PHASE IX LIFT STATION #1
JANUARY 2006 ENGINEERING REPORT
ATTACHMENT#4
Pump Information
.mp&Power Equipment FAX NO. :7137831221 Dec. 20 2005 06:41PM P1/5
r 'OffSECTION:Z4.20,160
QL/4L/TY PUMPS SNCF ��SJ 7n 3 f -fs
! 2
M1767iy4. '�ti/fir
44', I Lyi' 0501
4,01- ,t1i1A ; YNF :
Product information 4 �'v t r ('i1 Supersedes
presented here Winos i;4:1
0
-fly/'ftp {y� t �y/�/�T 0600
conditions at lima of s M61#1. /!1 IR11,011 /5
�— publication. Conaull factory ,.` '
regarding discropancles or MAIL TO: P.O. BOX 16347'Louisville,KY 40256-0347 visit our web site:
inconsistencies. SHIP TO: 3649 Cane Run Road •Louisville,KY 40211-1961 http://www,zoeller com
(502)778-27:31•1(800)928-PUMP•FAX(502)774-3624
SubinenIhle Wastewater
a
id tion 71 SERIES OJP`Ty
T•
GRINDER PUMP GUIDE SPECIFICATIONS
MEMBER 3,5&71/2 HP �Gcu
1.01
GENERAL:Contractor shall furnish all labor, material,equipment and incidentals required to provide (QTY)centrifugal
grinder pump(s)as specified herein.
2.01
OPERATING CONDITIONS: Each pump shall be rated at H.P., volts, phase, HZ., 3450
R.P.M.The unit shall produce G.P.M. at feet of T.D.H.
The pump shall have a 2W flanged discharge adaptable to 3" and be capable of handling sanitary sewage and grinding it
into a fine slurry enabling it to be pumped over long distances or high vertical lifts in pipelines as small as 2.00"in diameter.
3.01
CONSTRUCTION:The centrifugal grinder pump shall be equal to the Model submersible type as manufactured
by the Zoeller Engineered Products Company of Louisville, Ky. (800-928-7867).The castings shall be constructed of baked
on epoxy coated class 30 cast iron.The motor housing shall be finned and oil-filled to dissipate heat and enable the unit to
operate unsubmerged without damage to the motor.Air-filled motors shall not be considered equal because of their inability
to dissipate heat from the motor, All external-mating parts shall be machined and sealed with a buna-n square ring. All
fasteners exposed to the liquid shall be 300 series stainless steel. The motor shall be protected on the top side with an
attached sealed junction box chamber which in the event of cord damage will prevent moisture wicking into the motor
housing.The motor shall be protected on the lower side with a tandem mechanical seal arrangement with each seal having
a separate spring assembly. The upper and lower ball bearings shall be capable of handling all thrust loads. The pump
housing shall be of the concentric design thereby equalizing the pressure forces inside the housing,which will extend the
service life of the seals and bearings,The top cap shall have cast in lifting lugs.Seal leak probes located in the oil-filled seal
cavity and thermal sensors located in the oil-filled motor housing shall provide protection to the unit.
4.01
ELECTRICAL POWER CORD: The pump shall be supplied with 25'/ 50' / 75' of multiconductor power
cord. It shall be SO type cord capable of continued exposure to the pumped liquid. Power cord shall be sized for the rated
full load amp rating of the pump in accordance with the National Electric Code. Power cable shall enter into the junction
chamber through a compression type-sealing gland.Water sealing and strain relief is separated. Each individual conductor
shall be sealed against wicking should the cable become damaged. The entire junction chamber shall be sealed off from
the motor housing by through wall terminals to protect the motor from moisture.
5.01
MOTOR:The oil-filled motor shall be a Class F insulated NEMA B design rated for continuous duty.At maximum load,the
winding temperature will not exceed 250 degrees F unsubmerged. Since air-filled motors are not capable of dissipating
heat, they shall not be considered equal. Start capacitors and relay shall be mounted externally from the pump in a panel
within 50 feet of the pump location. The unit shall have a bi-metallic thermal sensor and shall use magnetic starters with
overload relays in the control panel for additional protection
-` 6.01
BEARINGS AND SHAFT Upper and lower ball bearings made of high carbon chromium steel shall be provided to prevent
shaft deflection by withstanding all thrust and radial loads.The motor shaft shall be made of 416 SS and have a minimum
diameter of 1.25".
®Cnnvrieht 2001 Zoeller Co.All rights reserved.
Received Time Dec. 20. 6: 36PM
FROM :Pump&Power Equipment FAX NO. :7137831221 Dec. 20 2005 06:42PM P2/„
7.01
SEALS: Pump shall have a dual mechanical seal configuration with the seals mounted in tandem. Each seal assembly
having carbon rotary and ceramic stationary faces with buna-n elastomer and 316 SS spring. It shall he equal to a Crane
Type 21 configuration, Double seals with a common intermediate spring shall not be considered equal. Seal leak probes
shall be prepackaged in seal chamber to detect presence of water and indicate a lower seal failure,
Optional seal faces shall be
Silicon carbide/carbon Lower/ Upper.
Silicon carbide/silicon carbide Lower/ Upper.
8.01
IMPELLER:The impeller shall be a fully balanced bronze casting with pump out vanes on the back shroud to keep debris
away from the seal area. It shall be keyed arid bolted to the motor shaft.
8.02
CUTTER MECHANISM: The cutter and plate shall be constructed of 440 SS with a Rockwell C hardness of 58-60, The
stationary cutter plate shall have specially designed orifices machined through it which enable the slurry to flow through the
pump housing at an equalized pressure and velocity. The rotating "star" cutter design shall have double-sided cutting
blades thereby increasing the number of cutting surfaces. Other cutter designs with tight clearances and those that grind on
the circumference of the rotary plate shall not be considered equal.
9.01
PAINTING; The exterior castings of the pump shall be protected with a green baked on epoxy powder coat paint.
As an optional feature include
Double epoxy coating protecting all Internal and external wetted surface areas shall be required
10.01
SERVICEABILITY:Components required for the repair of the pump shall be readily available within 24 hours. Components
such as mechanical seals and bearings shall not be of a proprietary design and be available from local industrial supply
houses. Special tools shall not be required to service the pump:A network of service stations shall be available nationwide
in those cases where service requirements are beyond the scope of in-house service mechanics.
11.01
SUPPORT: The pump shall have support legs enabling it to be a freestanding unit. The legs will be high enough to allow
solids and long stringy debris to enter the cutter assembly.
For those installations requiring a field assembled rail system:
_ Rail system with pump suspended by means of a sealed pump plate attached to the pump.
Rail and guide brackets shall be SS. Rail pipes to be provided by others.
SS intermediate stabilizer required for rail systems used where basin depths are greater than 12 feet
For those"Outdoor" installations requiring a factory assembled basin package:
Simplex system with a " diameter by depth basin.
Duplex system with a �.�"diameter by "depth basin.
12,01
TESTING: Each pump shall run in liquid before being shipped. It shall be checked at its maximum running point for
performance, amps, grounding,winding insulation, and watertightness.
An optional certified test based on the Hydraulic Institute's or SWPA(Submersible Wastewater Pump Association)
Test Standard for submersible pumps.
Start up services at the job site by an authorized representative of Zoeller Engineered Products Company shall be
required. Start-up report form ZM1074 should he completed in the presence of the installers and returned to the Project
Engineer or Zoeller Engineered Products Company,
13.01
WARRANTY: The five year pro-rated warranty for permanent municipal wastewater lift stations shall be in writing in a
published service bulletin. Labor charges from an authorized service station for repairs will be included in this warranty
agreement during the first 12 months of operation.
Received Time Dec. 2 0."..-6.:'3 6+Pool Zoeller Co.All rlghis reserved.•
amp&Power Equipment FAX NO. :7137831221 Dec. 20 2005 06:43PM P3/5
p SECTION:Z4,20.100
`•QUAL/TY PUMPS 3NCE �e% y�� *;•" '.-; 4 34 S e',L >i "sr', ,'�' ZM 1786
4.• ''y 4 i'••'' ,, 'i ,a?7 ,,,1.., 1001
IS1 . t yt ,. , �� .,t i iN ,�' I�'
.-:!,,,,,,',,:i;;,-",}�: ,,s ., l',;, �� Supersedes
' Product information ;�. �x o 0701
presontod here reflects ',:2,„ INS/NE"ERED. RIIDL/[jq
�/ conditions at tlme of " ' -
publication. Consult factory
regarding discrepancies or MAIL TO: P.O. BOX 16347•Louiivllla,KY 40258-0347 visit our web site:
inconsistenrlas. SHIP TO: 3649 Cane Run Road •Louisville,KY 40211-1A61 • http://www.zoeller.com
submersible Mtadewater (502)778-2731.1(800)928-PUMP•FAX(502)7744824
dui isescille• 71 SERIES • **#.i•
740
Apprt•V?d Curvy PRODUCT FEATURES
and Data Format 3,5&7%HP Grinder Pumps .
APPLICATIONS
• Sewage lift stations. l
• Housing developments. 63)----------111 1��/i1 �z- tJ
_% 1. `�'------C�
• Low pressure sewer systems. k lki,/
• High vertical lift or long force mains. (4) i i Q �, 4 •. N
MATERIAL FEATURES — '� !!!00,/� % 3 pp RI
-
MATERIAL _1 F\'C N N M
PUMP: S ` ��; uj 0 X eco �
C7" a 0 W
• 440 Stainless steel cutler and plate hardened to Rockwell C58-60. '• .•.
• Discharge Size-2W Flanged horizontal adaptable to 3'flange, _ t \ �� �- x i eS `'J'
• Seals-dual mechanical carbon/rotary ceramic/stationary,buna-n elastomers. C7 ~ ` ;t 1--- h ^
• Seal leak probes and lead wires. ��� I A. M y\ o. 0
• Construction -Cast Iron ASTM A-48, Class 30, 30,00011 tensile strength, (i t Nem
protected with a corrosion resistant baked on epoxy powder coating. ~' ' �E 2 T
�� a
• Balanced concentric pump housing and impeller. � \�
• Attaching Hardware-304 stainless steel. (a , �a r:�__ f
• "0"Ring Seals-Buna-N.
• Impeller-Bronze vortex design, I`\\� �
• Optional; 0 Trimmed Impeller. 0 Automatic Reversing
N`
`�--` ❑ Silicon carbide seal(s). (3-Phase Only) (1.- ____. ��� 'G -
❑ Additional cord length_ft. 0 Rail systems, ' [oj�rok \
❑ High Flow (?> .__ \A\\
MOTOR: \"� 111
IDY
• 1 Phase-230 Volt(3&5 HP Only). ���., &i&\' ', : ` W" ,•
• 3 Phase-200/230/460/575 Volt,3450 RPM. i -; - nwl�•7 .\ .,,...'l.=: /� ��
• Stator-Class F insulation and lead wires, ��'- 7 '_"""��� r_____'Nema B design. _ ��r% �/ .,��t3• Thermal sensor with leads. ��1 /, �✓ ,�
• Housing-Cast Iron,oil-filled, Gr-
�Il//•I SIU I.- 2uiiaw/ar1/el, V.
• Ball Bearings-Upper and lower high carbon chromium steel. (1 1 l I f _
• Power&Sensor Cable Length•25'. Int �f
FEATURES: I®
2FPAM69B
1. 25 heavy duty power cable.
2, Protected cable entrance, The compression grommet allows for field 14, 'Star'type stainless steel cutter and plate hardened to Rockwell C58-60,
replacement of the cable. 15. Concentric case reduces radial loading for longer bearing and seal life.
3. Each conductor Is Individually sealed to eliminate cord wicking of liquids, 16. 2W Ranged horizontal discharge adaptable to 3'flange.
4. Lifting lug integral part of housing. 17. Vent hole helps prevent air locking.
5. 011-filled motor housing assures uniform heat distribution, lubricates bear- 18. Screw on pipe legs for field flexibility,
Ings,and conducts heat for cooler running. 19. Class 30 Cast Iron housing protected with corrosion resistant baked on
6. Heavy duty motor features ball bearing construction. Class F motor insula- epoxy powder coating.
ton Is double dipped and baked. End connections and lead wires are 20. Finned motor housing for quicker head dissipation.
Class F.At maximum load,winding temperature will not exceed 250°with
motor housing not submerged, For additional information on 71 Series pumps,refer to catalog on Performance
7. Tandem seals.Carbon/rotating,ceramic/stationary,buna-n elastomers, Data-ZM1786; Dimensional Data-ZM1787; Guide Specifications-7141767,
•- 8. Upper and lower high carbon chromium steel ball bearings, ZM1771,ZM1769. Service Manual and Replacement Parts List-ZM1788 and
9. Stainless steel shaft and hardware resists corrosion. Owners Manual-ZM1789.
10, Seal leak detector probes.
11. Thennal sensor protection. For information on additional Zoeller products refer to catalog on Rail Systems-
12. 25'sensor cable. ZM1347; Control Panels - ZM1342 and ZM1343; Float Switch Brackets -
13. High efficiency Impeller design made of cast bronze,fully balanced with ZM1328; Pump Lifting Cables-ZM1328; Check Valves and Piping Accessories
integral pump out vane to clear debris. -ZM1348,
Received Time Dec. 2 0. c 6: 36 P M2oo1 zoeller co,All rights reserved.
FROM :Pump&Power Equipment FAX NO. :7137831221 Dec. 20 2005 06:44PM P4.
� O or SECTION:Z4.20.1.
12242/TY PL/41,68,7/NCE I��J " a'` '- r' R ✓dl� t r ,, Fry`i ,- ZM1786
rt
�,�" I or , fit',
i^03(1 s,• , f� .., 0 1102
` > 4,i i .r u, ! �" til• ,i,.„041;4''':.,: Supersedes
� r'1'i,}M ..Ni Via, 171 !:0,1'. 4Rr 11.:
Product information i,y Rye,.
0901
preeRntad here reflects ,,,:,:g.....,,,_
�i t` 'riN ��ITffili
• conditions at time of _:,, ,:� r (�r9 fl" 11-171111/35
•---1 publication. Consult factory '•;; '-
regarding divrrepr,ncles or MAIL TO: P.O. BOX 16347•LoulavIlla,KY 40258-0347 . visit our web site:
inconsistencies. SHIP TO: 3649 Cane Run Road •Loulsville,KY 40211-1981 httpJ/www.zoeller.com
(502)778-27:t1•1(800)928-PUMP•FAX(502)774-3824
Submenlble Wastewater
leedatbe OP r,i
71 SERIES GRINDER PUMP a "
Apps Curve • PERFORMANCE DATA i
•
and Data Format 3,5 8.7%HP-3450 RPM - R
rn
CG
LTI HIGH HEAD MODELS
55 -'180 - .... • .
.........:.....1 ... IMPELLERS
• � STANDARD
168 - .. 7/4^'q - �.� Horsepower Diameter
• • . 7 1 2 HP. 391• : •••••••• ••••••• 7110 - 3.0 HP • 5-1/4'
50-� /
...............:... • ` :.,......:.., .: 7111(1 Phase) - 5.0 HP - 6-1/8"
156 ' '
45 - .............._.... .......:....i ........ Phase) - 5.0 HP 6-3/8'
a.B.....: T„ -: _ 7112(3 Phase - 7.5 HP - 7-1/4"
144 --- 2; ' _..__.._ ... .. ..
•
40 -•132 - i : Iii._ : ;..... ...._:..
...6 • '""""'i
-I.. ...... ..... .
D/q
120 • •
- -�
-
•
•
• . s orflL
�:• = 108 . .
iq w
< • ! • i iii • • ' ; ; ; ; ; , , ; . , • ; ; : • : : --r......r.••••i•-i..... O. 2._ icz r--- i
20 — :..: 2 GPM :.........:.....•.......:...:......._...
i.
15 48 3 FT- .
36 ;.... - —
10 — • ' A CAUTION ;.. .. " : .• ,
Motor overloading can occur if an : : :...:......:...:..._........ ..:..
oversized impeller Is used In an application withoulenough ; ; ••••— ••
24 : :
head.Always verify the actualTON of an application before i
usinganonelandredimpellersize.Singlepnasopumpsare '
5— not sold with oversized Impellers. " i
::::: :::
U.S. GALLONS 8 16 24 32 40 48 56 64 72 BO 88 96 104 112 120
LITERS. •-.. ' 1 1 I "T ' "'1-- I I I
0 50 100 150 200 250 300 350 ' 400 450
FLOW PER MINUTE Aaos23
•
Zoeller Engineered Products•3649 Cane Run Road•Louisville, Kentucky 40211-1961 •(502)778-2731
SWPA Data Categories Presented-Data on this sheet supply design Information as the minimum recommended by the Submersible Wastewater Pump
Association and Is defined In accordance with SWPA's Standardized Definitions for Pump and Motor Characteristics. The accuracy of the data Is the
responsibility of Zoeller Engineered Products.
d:r r•nnvrinh 2002 Zoeller Co.All rights reserved,
Received Time Dec, 20. 6:36Ptvi
INDIAN LAKES, PHASE IX LIFT STATION #1
JANUARY 2006 ENGINEERING REPORT
ATTACHMENT#5
Pump System Curve
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EXHIBIT D
Copy of Letter to TCEQ
Indian Lakes Offsite Sewer System
MBESI#10620012
8tMcCLURE & BROWNE ENGINEERING/SURVEYING, INC.
I �
1008 Woodcreek Drive,Suite 103 •College Station,Texas 77845
(979)693-3838•Fax:(979)693-2554•Email:McClureBrowne@Verizon.net
January 25, 2006
Mr. Louis C. Herrin, III, P.E.
TCEQ—MC 148
P.O. Box 13087
Austin, Texas 78711-3087
Re: Chapter 317 Summary Transmittal Letter
Permittee: City of College Station—Lick Creek WWTP
Permit Number: TPDES 10024-003
Project Name: Villages of Indian Lakes, Phase 9—Lift Station, Force Main&
Offsite Gravity System
County: Brazos
MBESI: #10620012
Dear Mr. Herrin:
The purpose of this letter is to provide the TCEQ with the information necessary to comply
with the requirements of Ch.317.1(a)(3)(D) of the TCEQ rules titled, Design Criteria for
Sewerage Systems. The necessary information includes:
1. Engineering Firm: McClure &Browne Engineering/Surveying, Inc.
1008 Woodcreek Dr., Suite 103
College Station, Texas 77845
2. Design Engineer: Jeffery L. Robertson, P.E.No. 94745
3. Facility Owner: City of College Station, Brazos County, Texas
4. The plans and specifications that describe the project identified in this letter are in
substantial compliance with all requirements of Chapter 317.
5. Project Description: The wastewater improvements that are detailed within this project
are located within the ETJ of the City of College Station in Brazos County, Texas, and
are designed to connect to the existing wastewater collection system. The city is
currently extending sewer lines to a point near this subdivision. The project described
here is the second of a two-phased project that will capture wastewater in Phase IX of
the Villages of Indian Lakes and carry it to the new line that the City is building. The
first phase was submitted under a previous letter. It involves the collection lines within
the subdivision. This second phase involves a lift station, force main, and a gravity
sewer line that carries wastewater to the new line currently under construction by the
City.
Mr. Louis C. Herrin
page 2
Gravity Wastewater Lines:
Number of Services: Residential — 0 initially; the line may potentials serve up to 413
with the development of surrounding tracts of land.
Amount/Type of Gravity Wastewater Pipe to be installed:
Pipe Size Grade(%)
Material Length(ft)
(in.) Min. I Max.
8 I ASTM D3034, SDR 26 PVC 1930 0.55 1.65
10 ASTM D3034, SDR 26 PVC 1080 0.40 : 1.00
Manholes:
Number- 9
Range of distances between manholes— 158 ft to 488 ft
Force Main:
Amount/Tye of Pressurized Force Main to be installed:
Pipe Siz) e Material Length(ft)
2.5 ! ASTM D2241, SDR 26 PVC 4894
Lift Station:
The lift station does not lie within the 100-yr floodplain according to FEMA FIRM
Panel No. 48041CO215C dated July 2, 1992.
Number of Pumps - 2
Pump Model/Manufacturer- 71 Series Grinder Pump made by Zoeller Engineered
Products, Inc.
Size of Pumps - 7.5 hp
Pump Capacity: Inflow- 9.17 gpm(avg); 27.5 gpm(max)
Outflow- 40 gpm
The plans for the Phase IX Lift Station, force main, and offsite gravity line will be reviewed by
the City of College Station, and they will also provide construction inspection. If you have any
questions regarding this project,please contact me at 979-693-3838.
Sincerely, OF TFk
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i JEFFERY L.ROBERTSON
sor,
ffer L. R bertson, P.E. I 94745 lir
cc: TCEQ Region 9 Office, Wastewater Program r ONAL G
City of College Station, Development Services Department k,
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