HomeMy WebLinkAbout00070389Design Report
Proposed Sanitary Sewer Line Improvements
for
Castlegate Subdivision
Section 2, Phase 1
College Station, Texas
November 2000
Prepared By:
TEXCON General Contractors
1707 Graham Road
College Station, Texas 77845
(979) 690-7711
REVIEWED FOR
DEC 0 r, 2000
ENGNEEf ING
: IF- OF Td®'~
~P ..........,Ft !0
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JCSEPH-P. SCHULTZ
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1.0 INTRODUCTION & DESCRIPTION
The purpose of this report is to provide a description of the proposed sanitary sewer to be
constructed with the Castlegate Subdivision, Section 2, Phase 1, and to provide the
criteria used in the design of this sanitary sewer system. The project will include the
construction of approximately 2625 feet of sanitary sewer line. The line will service the
proposed development of the Castlegate Subdivision, Section 2, Phase 1, as well as the
future development of Section 2, Phase 2.
2.0 SANITARY SEWER - Design Flow and Pipe Size Calculations
The proposed sewer line is to be constructed of 6" and 8" diameter SDR-26, PVC pipe
which meets the requirements of ASTM-D3034. The proposed manholes are 4' diameter
manholes, and vary from 9' to 12' in depth, with sewer line slopes ranging from 0.60% to
3.75%. The maximum distance between manholes is less than 500 feet, as required by the
Texas Natural Conservation Commission (TNRCC). The minimum allowable slopes for
8" and 6" pipes per TNRCC requirements are 0.33% and 0.50% respectively. All
construction shall meet the current City of College Station Standard Specifications for
Sanitary Sewer Construction. The sewer line information is summarized in Table 1.
3.0 DETERMINATION OF PEAK FLOW VALUES
The peak flows were based on using a daily use of 300 gallons per day for each dwelling
unit. The design peak flow is determined by multiplying the average daily flow by 1.5,
which results in the adjusted daily flow. This value is then multiplied by 3.0 to determine
the peak hourly flow. The velocities for the lines were calculated using Manning's
Equation. According to the TNRCC, the minimum velocity for sewer systems flowing full
is 2.0 feet per second. As shown in Table 1, the minimum anticipated flow velocities for
the proposed sewer lines at 50% full meet this requirement. The flow for 100% full will
not be less than the flow for 50% full; therefore, the TNRCC requirement is met. The
TNRCC requires that the maximum velocity for sewer systems flow full not exceed 10 feet
per second. The values in Table 1 are well below this maximum velocity.
TABLE I - SEWER LINE FLOW DATA
16
Manhole
No. of
Units From
Cumulative
Average
Percent
50%
Full
Z
m
Number
Size
Length
Dwelling Unit
Merging
Dwelling
Daily Flow
Peak Flow
Full
Flow
Velocity
c
J
From
To
(in)
(ft)
g
services
Lines
Units
(gpm)
(Cfs)
(Cfs)
WS)
(fps)
207
206
6
230.40
3.7
3
3
0.62
0.0003
0.0013
2.6
0.5433
5.5
206
205
6
313.60
1.30
5
8
1.67
0.0008
0.0035
5.3
0.3199
3.3
205
204
8
237.50
0.60
5
13
2.71
0.0013
0.0057
_
5.6
0.4680
2.7
c~
204
203
8
166.60
0.75
2
_
-
15
3.12
0.0014
0.0065
5.6
0.5233
3.0
Cn
203
202
8
268.00
0.75
8
23
4.79
0.0022
0.0100
6.9
0.5233
3.0
202
201
8
169.10
0.75
2
-
25
5.21
0.0024
0.0109
7.2
0.5233
3.0
201
S-109
8
161.70
1.00
4
29
6.04
0.0028
0.0126
7.2
0.6042
3.5
212
211
6
313.00
1.50
8
8
1.67
0.0008
0.0035
5.1
0.3436
3.5
211
210
6
125.00
1.50
4
12
2.50
0.0012
0.0052
6.2
0.3436
3.5
210
209
6
174.60
2.00
4
16
3.33
0.0015
0.0070
6.7
0.3968
4.0-
04
N
209
208
8
194.00
1.50
2
18
3.75
0.0017
0.0078
5.2
0.7400
4.2
Future Development to Manhole 208
11
-
29
6.04
0.0028
0.0126
-
-
208 S-111 8 270.10 1.30
5
22 (s-1t t )
56
11.66
0.0054
0.0244
9.2
0.3199
3.3
Future Development to Manhole S-111
22
-
22
4.58
0.0021
0.0096
-
-
Sewer Line 53-3 has been addressed previously in the sewer report for Section 4
n = 0.013
Refer to construction drawings for manhole locations.
4.0 CONCLUSIONS
It is our determination based on the criteria and data developed that the proposed sewer
line will provide sufficient capacity for the anticipated wastewater flows generated by this
development and the development of Section 2, Phase 2.
Form Approved. OMl3
THIS FORM REPLACES PREVIOUS FORM 3510-6 (8-98)
See Reverse for Instructions
United Stales Envirorurwntal Protection Agency
Washington, DC 20460
NPOES `L'wl EPA Notlce of tntent (NOI) for Storm Water Discharges Associated with
FORM \ CONSTRUCTION ACTIVITY Under a NPOES General Permit
Submission of this Notice of Intent constitutes notice that the party identified in Section I of this form intends to be authorized by a NPOES
lot storm water discharges associated with construction activity in the StateAndian Country Land identified in Section it of this form. Submissio,
of intent also constitutes notice that the party Identified in Section 1 of this form meets the eligibility requirements in Part I.B. of the general po
those related to protection of endangered species determined through the procedures in Addendum A of the general permit). undorstands
authorization to discharge Is contingent on maintaining permit eliigubifuty, and that implementation of the Storm Water Pollution Prevention Plan
Part IV of the general permit Yip begin at the time the permittee commences work on the construction project idontifiod in Secan 11 below. i
OBTAIN AUTHORIZATION. ALL INFORMATION REQUESTED MUST BE INCLUDED ON THIS FORM. SEE INSTRUCTIONS ON BAC
OwnadOperator (Appllcant`~) Information pp p DD -7 q n
Name: 1116&G101wm"I I~I~INI~11~1~1L1 1~)~It`'1T1~1~ILIT1~1~151 I 1 I Phone: L1LL11L61?L
Q Status of
Address- 111 0111 IN A[ p (trt 141 N6 910 1 A 1Q1 I I I I~ I I I I I I I I 1 -L -J OwnedOperat~
City IGoI~~-1 b 1V1~1 1 Sl~l~l~ld i91ro 1 1 1 1 1 1 1 1 State: Tip Code: 17171a14-I51-
IL ProlectfSlte trdormatlon
is the tacility local
Country Lands?
1CJA5 1T, ~J
f 16IAITIKI 1-51u,11,61 , of Zi
S III DINT I I 1 1 1 1 -L
J
I Yes
project Name:
D
& V lc c le- I ~1 y
14 1 k I It
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I I P I r 10"1 i I I' I
C I I RI 0 A
t0 I I I I. 10 I ~-c . (
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ProjectAddress/Location: I(y I
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(
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7 7 S-
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( 1 1 1 1
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Stale:
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ode:
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Latitude: (101
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Longitude:
ou
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Has the Storm Water Pollution Prevention Plan (SWPPP) been prepared?
Yes m No ❑
Optional: Address o (location of
SWPPP for viewing
~ress in Section I above
❑ Address in Section 11 above
❑ Other address (if k
WPPP
Phone:
S
Address: 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1
1 1 I 1 1 1 1 1 1 1 1 1 1( 1 1 pp 1 1 I 1 I -J State: I zip Code: ( I I I 1 1-
Name of Receiving Water: 1 S t PI RJ NI GI I C4 FdC-l EI KI 11 I 1 1 I 1 I 1 I
I/f0101~IZ lolot0l
Mont, ow ww
Estimated Construction Start Date
1011111014010111
Alonm oar Year
Estimated Completion Date
1
Estimated area to be disturbed (to nearest ac(e): L 1 1 1 1215
Estimate of LikeHmood o(Discharge (choose only one):
t. ❑ Unlikely
2. ❑ Once per month
3. ROnce per week
4. ❑ Once poi day
S. ❑ Continual
Based on kistnxtion provided in Addendum A of IN
there any fisted endangered or threatened species.
critical habitat in the project area?
Yes E] No~
1 have satisfied permit e69bi6ly with regard to prote•
endangered spades through the indicated section of I
of the petmit (che& one or more boxes):
(a) &K1*'-(b) ❑ (c) ❑ (d) ❑
111. Certification
I cattily under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance Y
designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or
manage this system. or those persons directly responsible lot gathering the information. the information submitted is. to the best of my kr
belief, true. aoarate. and complete. 1 am aware that there are significant penalties for submitting false information. including the possibil'
imodsormeM for knowino violations.
Print Name:
Signature:
T
Date: TAL -t-41
EPA Form 3510-9 replaced 35io6 (8-98)
fffkCO~N
General Contractors
Div. gt'CDS Enterprises, Inc.
1707 Graham Rd. • College Station, TX 77845 • 409-690-7711 • Fax: 409-690-9797
December 20, 2000
Bridgette George
Asst. Development Coordinator
City of College Station
1101 Texas Avenue South
College Station, TX 77842
RE: Castlegate Subdivision, Section 2, Phase 1 - College Station, Texas
Dear Ms. George:
Attached are 10 copies of the revised Final Plat, the revised mylar original, 5 revised
copies of the construction documents, 2 revised drainage reports, and the "redlined" copy
of the construction documents. Also attached is a summary of our response to the Staff
Review Comments.
If you have any questions or need additional information, please do not hesitate to give
me a call at (979) 690-7711.
Sincerely Yours,
Joe Schultz, P.E.
Civil Engineer
Attachments
FTCEP~STION
DEVELOPMENT SERVICES
TRANSMITTAL LETTER
Name/Firm: -T-e C n y-t - o Date: 1 ~ - 22 - Zso O
Address: \-I()- l [-~~a~a>nn Phone: (AID - I] I I
r11\k.0A0 CIVA~111 n "fX Fax: [ago - 9791
We are transmitting the following for Development Services to review and comment: (Check all that apply.):
❑ Master Development Plan
❑ Preliminary Plat
El Final Plat
❑ FEMA CLOMA/CLOMR/LOMA/LOMR
❑ Site Plan
❑ Grading Plan
❑ Landscape Plan
❑ Irrigation Plan
❑ Building Construction Documents
w/ ❑
Redlines
Development Permit App.
w/ ❑
Redlines
❑ Conditional Use Permit
w/ ❑
Redlines
❑ Rezoning Application
w/ ❑
Redlines
❑ Variance Request
w/ ❑
Redlines
❑ Other - Please specify
w/ ❑ Redlines
w/ ❑ Redlines
w/ ❑ Redlines
w/ ❑ Redlines
YRASTRUCTURE AND ENGINEERING DOCUMENTS
All infrastructure documents must be submitted as a complete set.
The following are included in the complete set:
Waterline Construction Documents w/ ❑
Redlines
UrSewerline Construction Documents w/❑
Redlines
@' Drainage Construction Documents w/ ❑
Redlines
Street Construction Documents w/ ❑
Redlines
❑ Easement application with metes & bounds decsription
U Drainage Letter or Report w/ ❑
Redlines
ff-Fire Flow Analysis See -§eC on Ij Ph a- w/ ❑
Redlines
1.~ Se~1er ~.~~~Tn
Special Instructions:
❑ TxDOT Driveway Permit
❑ TxDOT Utility Permit
❑ Other - Please specify
TRANSMrrrAL LETTER 1 of I
TRANSMrr.DOC 03/23/99