HomeMy WebLinkAboutSewer Report SEWER SYSTEM ANALYSIS
FOR
INDIAN LAKES SUBDIVISION
PHASE IX
COLLEGE STATION, TEXAS
January 2006
MBESI# 1062-0012
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
SEWER SYSTEM ANALYSIS
FOR
INDIAN LAKES SUBDIVISION, PHASE 9
General Information
Area encompassed by this phase: 15.4 acres
Anticipated land use: Single family residential
Anticipated number of lots: 44 lots
Notes on surrounding development: The area surrounding the Phase 9 consists of
previous phases of Indian Lakes. These are single-
family residential lots that are generally 1 acre or
larger in size.
Sewer System Analysis
Primary outfall line: The outfall for Phase 9 will be a 12" line in the Nantucket
Subdivision that carries wastewater to the Lick Creek WWTP.
Construction of this line is expected to begin in early Spring of
2006. A lift station, force main, and a section of gravity line are
currently being designed to carry wastewater from Phase 9 to the
12" line in Nantucket.
Software model: Microsoft EXCEL Spreadsheed based on Manning's Equation
Average daily flow: 267 gpd per residential lot
Peaking factor: 4.0
Pipe Material: PVC (D3034)
Manning's N value: 0.013
Spreadsheet Notes: The spreadsheet in Exhibit A computes the anticipated flowrates
from each area and the minimum slopes of the lines that serve
those areas. It compares the computed slope with the required
minimum slope and the design slope from the plans (when
available). If the computed slope is less than the minimum or less
than the design slope, the spreadsheet indicates the line is "OK".
If not, it indicates the line is"Flat".
Conclusion: All of the lines in the spreadsheet on Exhibit A 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: 2 g,OF k,t,
Exhibit A Schematic Sewer System Layout 4-, ,t,.,,
Exhibit B Sewer Model Spreadsheet "i< �� '
Exhibit C Copy of Letter to TCEQ ;:� �aEt �lto� ce L
tr. 65923 `
`'we-6
Inz-ianLakes,Phase 9
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N & I McCLURF. & BROWNE ENGINF,F,RING/SURVF,YING, INC.
J �
1008 Woodcreek Drive,Suite 103 •College Station,Texas 77845
(979)693-3838•Fax:(979)693-2554•Email:McClureBrowne@Verizon.net
December 16, 2005 Exhibit C
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
Permit Number: TPDES 10024-003
Project Name: Villages of Indian Lakes, Phase 9
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 which 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 first of a two-phased project (see note below) 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 two phases will be built concurrently, but for permitting purposes related
to the entire subdivision, this phase of the wastewater system is being submitted first.
This first phase involves the collection lines within the subdivision. The following is a
general description of the new collection system:
Mr. Louis C. Herrin
page 2
Gravity Wastewater Lines:
Number of Services: Residential—24 services lines serving 44 lots
Amount/Type of Wastewater Pipe to be installed:
Pipe Size Material Length(ft) Grade(%)
(in.) Min. ! Max.
6 1 ASTM D3034, SDR 26 PVC j 1779 j 0.80 j 3.12
6 1 ASTM D2241, SDR 26 PVC 90 0.80 I 2.91
Manholes:
Number- 8
Range of distances between manholes— 110 ft to 360 ft
Note: The second phase of this project noted above is not part of this
notification letter. That project involves the construction of a lift station,force
main, and a section of gravity line that will connect the Phase 9 system to the
new line being installed by the City
The plans for the wastewater system in Phase IX 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.
OF '4a S
Sincerely, << �" ���s��
sae
k l; \i * 1®
. _.L C, z,�,_ 12116(0‘ JEFFERY L.RORER i SON O'
-0 94745 .:X
- - . Robertson, P.E. PA p •. �V
cc: TCEQ Region 9 Office, Wastewater Program
City of College Station, Development Services Department
SEWER SYSTEM ANALYSIS
FOR
INDIAN LAKES SUBDIVISION,
PHASE IX
COLLEGE STATION, TEXAS
December 2005
MBESI#1062-0012
SUBMITTED BY:
& McCLURE & BROWNE ENGINEERING/SURVEYING, INC.
1008 Woodereek Drive,Suite 103•College Station,Texas 77845
(979)693-3838• Fax:(979)693-2554•Email: McClureBrowne@Verizon.net
04
L
SEWER SYSTEM ANALYSIS
FOR
INDIAN LAKES SUBDIVISION, PHASE 9
General Information
Area encompassed by this phase: 15.4 acres
Anticipated land use: Single family residential
Anticipated number of lots: 44 lots
Notes on surrounding development: The area surrounding the Phase 9 consists of
previous phases of Indian Lakes. These are single-
family residential lots that are generally 1 acre or
larger in size.
Sewer System Analysis
Primary outfall line: The outfall for Phase 9 will be a 12" line in the Nantucket
Subdivision that carries wastewater to the Lick Creek WWTP.
Construction of this line is expected to begin in early Spring of
2006. A lift station, force main, and a section of gravity line are
currently being designed to carry wastewater from Phase 9 to the
12" line in Nantucket.
Software model: Microsoft EXCEL Spreadsheed based on Manning's Equation
Average daily flow: 267 gpd per residential lot
Peaking factor: 4.0
Pipe Material: PVC (D3034)
Manning's N value: 0.013
Spreadsheet Notes: The spreadsheet in Exhibit A computes the anticipated flowrates
from each area and the minimum slopes of the lines that serve
those areas. It compares the computed slope with the required
minimum slope and the design slope from the plans (when
available).. If the computed slope is less than the minimum or less
than the design slope, the spreadsheet indicates the line is "OK".
If not, it indicates the line is "Flat".
Conclusion: All of the lines in the spreadsheet on Exhibit A 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: X04 OF r
Exhibit A Schematic Sewer System Layout
Exhibit B Sewer Model Spreadsheet e �
Exhibit C Copy of Letter to TCEQ KENT. P�...•.o.• .,..i
6: F 65923 / $
•�•° (Mullah Lakes,Phase 9
4'f" --' w1BESI#10620012
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McCLURE & BROWNE ENGINE.E,RING/SURVF,YING, INC.
11008 Woodcreek Drive, Suite 103 •College Station,Texas 77845
(979)693-3838•Fax:(979)693-2554•Email:McClureBrowne@Verizon.net
December 16, 2005 Exhibit C
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
Permit Number: TPDES 10024-003
Project Name: Villages of Indian Lakes, Phase 9
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 which 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 first of a two-phased project (see note below)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 two phases will be built concurrently, but for permitting purposes related
to the entire subdivision, this phase of the wastewater system is being submitted first.
This first phase involves the collection lines within the subdivision. The following is a
general description of the new collection system:
Mr. Louis C. Herrin
page 2
Gravity Wastewater Lines:
Number of Services: Residential—24 services lines serving 44 lots
Amount/Type of Wastewater Pipe to be installed:
Pipe Size Material Length(ft) Grade(%)
(in.) Min. Max.
6 ASTM D3034, SDR 26 PVC 1779 0.80 3.12
6 ASTM D2241, SDR 26 PVC j 90 0.80 2.91
Manholes:
Number- 8
Range of distances between manholes— 110 ft to 360 ft
Note: The second phase of this project noted above is not part of this
notification letter. That project involves the construction of a lift station,force
main, and a section of gravity line that will connect the Phase 9 system to the
new line being installed by the City
The plans for the wastewater system in Phase IX 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.
.7 ` OF rr r-gg8
Sincerely, w
� ipt
•
f/1(/ % JEFFERY L.ROBERTSON
/"1 ( ( -0 94745 .:
Robertson, P.E. tttt��ns/cFrss G=�_'
cc: TCEQ Region 9 Office, Wastewater Program '���a��A�-`�~'
City of College Station, Development Services Department