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SEWER CAPACITY ANALYSIS
Sanitary Sewer Capacity Analysis for Villas of Harvey Subdivision College Station, Texas November 2003 Prepared By: TEXCON General Contractors 1707 Graham Road ar"n College Station, Texas 77845 C � (979) 764 -7743 f* 4 .. * : y ;*-41 4 .................... SCHULTZ g o '; 9 /4 firc; s 1(,11 -43 1.0 INTRODUCTION & DESCRIPTION The purpose of this report is to verify that there is adequate capacity in the existing sanitary sewer lines which will service the proposed sanitary sewer to be constructed with the Villas of Harvey Subdivision. The proposed sewer lines will connect to an existing manhole on the north side of Harvey Road. A 12" diameter line from this manhole connects to an existing manhole south of Harvey Road, which discharges into an existing 15" line. The 12" line will service this proposed development, as well as the future development of the surrounding commercial property. The capacity of the existing sanitary sewer lines along Harvey Road have previously been analyzed for the Central Baptist Church property and for the Crescent Pointe Development. The analysis data for these projects was provided by the City of College Station, and it is included in this report as Appendix A. The same assumptions used by The Wallace Group, Inc. for the Crescent Pointe Development for average loading, peak loading and inflow and infiltration were also used to determine the peak loading values for the Villas of Harvey development. The Villas of Harvey area was previously evaluated by The Wallace Group as Contributing Area Al, which is 210 acres. The Villas of Harvey development is 113 acres of the 210 acres. The remaining acreage was considered to be commercial development, as shown on the 30/60 plan. The peak flow developed for Area Al was 911,700 gallons per day (gpd). Based on the number of residential dwelling units shown on the Master Preliminary Plat, we have re- computed the peak flow for Area Al to be 1,080,900 gpd. These calculations are shown in Table 1. Table 1 also shows the calculations for the peak flows at the critical sewer line segments downstream to the existing 21" sewer trunk line. The critical line segments analyzed in this report were the 12" line under Harvey Road (designated as Segment 24), the 15" line at 0.4% slope (Segment 14), and the 18" line at 0.32% slope (Segment 19), which has the flow from all of the Contributing Areas. Exhibit 1 shows the location of the sewer line segments. Table 2 shows the peak loading flows for the sewer line and the pipe capacity values for the existing sewer line. A comparison of these values shows there is adequate capacity in the existing sewer lines based on the assumptions made in this report and the previous analysis performed by others. 2.0 CONCLUSIONS It is our determination based on the criteria and data developed that the existing sewer lines have sufficient capacity for the anticipated wastewater flows generated by this development and the future development of the surrounding commercial property. TABLE 1 Villas of Harvey - Sewer Capacity Analysis Sanitary Sewer Design Flows Residential 580 Dwelling Units @ 2.3 persons / Dwelling Unit x 100 gpd / per capita = 133,400 gpd Commercial 104.6 Acres @ 30 persons / Acre x 50 gpd / per capita Property = 156,900 gpd Total Average Loading = 290,300 gpd Peak Factor = 3 Total Peak Loading (Dry) = 290,300 gpd x 3 = 870,900 gpd Infiltration and Inflow (1000 gpd / Acre) = 210 Acres x 1000 gpd / Acre = 210,000 gpd Total Peak Loading (Wet) for Segment 24 (Area Al) = 1,080,900 gpd Total Peak Flow from Segment 8' 234,413 gpd Total Peak Flow from Area A2 399,500 gpd Total Peak Flow for Segment 14 = 1,714,813 gpd Total Peak Flow for Area A3 127,800 gpd Total Peak Flow for Area B1 through B14 1,681,600 gpd Total Peak Flow for Segment 19 = 3,524,213 gpd 1. See Appendix A - Sheet 2 of 14 2. See Appendix A - Sheet 11 of 14 TABLE 2 Villas of Harvey - Sewer Capacity Analysis Sanitary Sewer Design Flows Pipe Pipe Segment Q peak (wet) GPD Dia Type Slope Capacity GPD Comments 24 1,080,900 12" VCT 0.50% 1,628,029 Existing 12" pipe under Harvey Road to Villas of Harvey Property 14 1,714,813 15" VCT 0.40% 3,145,630 Existing 15" Pipe @ Linda Lane 19 3,524,213 18" D.I. 0.32% 3,849,800 Existing 18" Pipe APPENDIX A CITY OF COLLEGE STATION C_J DEVELOPMENT SERVICES 1101 Texas Avenue South, PO Box 9960 COLLEGE STATION College Station, Texas 77842 Phone (979) 764 -3570 / Fax (979) 764 -3496 MEMORANDUM DATE: September 4, 2002 TO: Tom Brymer, City Manager CC: Kelly Templin Dale Schepers FROM: Brett McCully, P.E., Assistant City Engineer SUBJECT: CENTRAL BAPTIST CHURCH SANITARY (02- 00500180) Tom, I have received and reviewed the capacity and flow generation calculations provided by CSU. We are in agreement that our current lines have sufficient capacity for the Central Baptist Church as proposed. It is important to note that our assumptions include future flows from development in the 30/60 corridor area to prevent a situation where acceptance of flows from the City of Bryan would remove needed capacity from our own developing areas. It is also important to note that future additional flows from Bryan could not be accommodated in the current lines, so replacement of system facilities would be a requirement of any future agreement. This concludes our technical review of the submittal, and we have no objections to providing service to the City of Bryan for the Central Baptist Church project. As always, please call me at x3763 should you have any questions or comments. Home of Texas A &M University From: Brett McCully To: Frank Simoneaux Date: 9/4/02 10:08AM Subject: Re: Central Baptist Spreadsheet Thanks for the forms. I went back and changed all the n factors to 0.013 per that TNRCC reg, and it did affect the numbers. Section one is now just barely OK, while section 7 is a little bit over our capacity. Given the multiple assumptions and factors of safety we are working with, and the peak timing differences that we are not taking into account, 1 am comfortable allowing this flow. I will be sending a memo to Tom today with our go ahead recommendation. Thanks for your efforts! Brett »> Frank Simoneaux 09/04/02 08:25AM »> See attached Frank O. Simoneaux, Jr., P.E. College Station Utilities (979) 764 -3592 (Phone) (979) 764 -3452 (Fax) Sheet No. YVG- DAMES & MOORE Calc. No. ( I I Rev. No. Job No. Job L. " � - (r.� l \ ��� ;� Ca P a c / 't •/ By Date Client Subject Chk'd. 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' "- :',.. . . . . . 0.'.i, r■ s ' 1 yt , . , . , • : •• • . ... . i Page 1 or I Frank Simoneaux - Re: Central Baptist 8 /1k From: Spencer Thompson To: Frank Simoneaux Date: 8/29/2002 2:18 PM Subject: Re: Central Baptist .............................. ................... Okay I "ve finally found the folder Sewer demands: in GPD min avg max 7 334.5 '' 662 • »> Frank Simoneaux 08/29/02 02:06PM »> Have you found the design loadings for the Super B convenience store? Frank O. Simoneaux, Jr., P.E. College Station Utilities (979) 764 -3592 (Phone) (979) 764 -3452 (Fax) file: / /C:\ Documents %20and %20Settings\fsimonea.000 \Local %20Settings \Temp \GW :0000 8 /29!2002 VT T H E C I T Y O F AN • TEXAS P.O. BOX 1000 • BRYAN. TEXAS 77805 • (979) 209 -5000 August 16, 2002 Mr. Thomas E. Brymer City Manager City of College Station P.O. Box 9960 College Station, Texas 77842 Re: Request for Wholesale Sewer Service for Central Baptist Church at.FM 158 and Elmo Weedon Road Dear Tom In full accordance with the recently and mutually approved Interlocal Cooperation Agreement, the City of Bryan respectfully requests that the City of College Station provide wholesale sewer service to the Central Baptist Church. The proposed church site is located north of FM 158 and west of Elmo Weedon Road which is primarily within the corporate limits of the City of Bryan with a northeastern pertion in Bryan's ETJ. • A set of Construction Plans and a Site Plan has been reviewed by the City of Bryan staff and is included for your review and comments. All design, construction, and testing fees shall be responsibility of the Central Baptist Church as the developer. As in Section 2.02 of the Interlocal Cooperation Agreement, the City of Bryan (the City Requesting Service) requests that the City of College Station (the City Providing Service) provide Wholesale Sewer Service to Central Baptist Church (the Customer of Bryan). The City of Bryan requests payment for sewer service to be based on the metered flow of water as per standard City of College Station rates for this type of customer. The ultimate projected flow rate from this customer is: Monday - Saturday = 3,000 GPD Sunday = 14,000 GPD with peak flow of 120 GPM - 17 Z Boa 6 Pp The design and construction of infrastructure required for this connection will include a manhole location that will accommodate appiopriate'flow monitoring equipment so that the City of College Station may install such equipment if they so desire. If this equipment is installed, the payment rates shall be based nn the actual measured flow instead of being based on the metered flow of water. • Site work has been underway for a few months, however no related public sanitary construction shall be permitted to begin until the City of College Station provides written approval to the City of Bryan. If you have questions or comments regarding the plans or the Agreement, please contact me at 209 -5100 or Alan Gibbs, the Project Engineer, or Joey Dunn, the City Planner at 209 -5030. - Thank you for your cooperation, OND Mary Kaye Moore City Manager of Bryan Cc: Rick Conner — City of Bryan, Public Works Director Linda Huff, P.E. — City of Bryan, City Engineer Alan Gibbs, P.E. —City of Bryan, Civil Engineer to Joey Dunn — City of Bryan, City Planner Dale Browne, P.E. — Ash & Browne Epgincering, Inc. 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(o co tG (()�r.�O)r - N(O O O . ^ ) •- W aj V 'N (o N N O Cl O V ai Ol f`I m • • t Y e~" Q N O K1 O'f0 fD a z : 4 cc z = 1 ��.. W V i 0)0 1 ,9 : N o 0 (r O O 1. (0 0 0 0 0 (1) O °° 't a) ' N.. co O o C1 1.- O O O .J J f - -' . . - .. . A ? . p 8 I( °'O n °O (4 � ow ° ° -olo R' D . . IV IC am— i 5 � C v Ti- c I y U H U g i ll N L O ' yCy F- F I.� c 1 U 0 0 ID N. 1 c C z n( u1 8 $ 2 o I(° co• !° 3? la a - — i6 F) 8 8 a 8E mm,m Q IL u I a c :2 E P f P E E W o a E'E ad d ua i 0 E d d fo m 0. E a)c) of K K u E E 8: E v E E w WDI Z < U t cIE a S E : °) E) Ei E E E g! EE E S �$ O Cg (3 U laol - '. ' c m ; _ c c U cl c � i cn a m J N i 0 1 m . o p ( N Q ° D, d) U Ei c',, N fr v J J J zz A 2 2 p IY , (00 00 00 U N r)c I— I— H N Q ! 3 y 1:1 4 � a F - _ m `ca3' "2 m 2 °ad o� co co m m O ff _ o 0 0 r- w C , w In 0 0 I2/ From: "Sabine Kuenzel" <Skuenzel@ci .college - station.tx.us> To: "Dale Schepers" <Dscheper. Utility# 032# Services #032#Center.City#032#of#032 #College #032 #Station@ci. college-station. tx.us> Date: 2/15/01 12:48PM Subject: land use assumptions ** High Priority ** very rough numbers, dale, but here they are for the remaining 210 acres between the pid - property and 158, and for the 80 acres between harvey road and the city limits: - * 55 acres of high density single family /townhome = 45 acres net at 8 dwelling units per acre = 360 units times 2.3 persons per household = 828 persons • 100 acres of medium density single family = 75 acres net at 4 dwelling units an acre = 300 units times 2.3 persons per household = 690 persons 50 acres of regional retail (gross) - uses would include big box retail, restaurants, theaters, nightclubs, shopping centers, etc., associated gas stations an additional 40 acres of commercial- oriented mixed use (gross) - potential uses would include medical offices, general offices, small restaurants, small retail ** 45 acres (gross) of small - scaled mixed use - would include about 70 single family homes times 2.3 = 161 persons. would also include about 5 -10 acres of church use and the remainder (about 15 acres, gross) of small retail /personal service (cleaners, hair salons,etc) and restaurants. notes: * 20 of these 55 acres are located north of 30 near the 158 intersection; the remaining 35 are located west of linda lane south of 30 ** all of these 45 acres are located east of Iinda lane and south of 30. thanks for your help! CC: "Jim Callaway" <JCALLAWAY.City#032#Hall. City #032#of#032#College#032#Station c©Dci .college- station.tx.us> Page 1 01 2 Frank Simoneaux - Sanitary Sewer Calculations 4 4 w ; �t r::^: i ir i. rSS:: i:: i:}::: ii::>:;^ v`•• a;: f?.:{• < i?. �9X.. G< 7frYl: rr: l`- i :%5G: ?.rirF..:?"rr,7.?.g::9!. {. ^` {f ?:rcm:•r.;r ...:.ycvr:+a: ..}rr .;}.. }..._::: <::: .:::.:....:.:...: �. �:::::.:.... From: "Nicole Moser" <nmoser @wallace - group.com> To: <Fsimonea @ci.college- station.tx. Date: 8/27/2002 10:32 AM Subject: Sanitary Sewer Calculations In analyzing the existing sanitary sewer system, we assumed TNRCC minimum grades on existing lines. We assumed a grade of 0.20% on the 15" VCT line which is on FM 30 upstream of Linda Lane: pipe capacity was 1.87 MGD. In our calculations, we projected wastewater flows based upon a peaking factor of 3.0 and an inflow /infiltration rate of 1,000 gpd /acre. On faxed calculation sheets, area Al is the 210 acre tract adjacent to FM 158 and between FM 60 and FM30. We broke this area up into the following usages, per discussions with the city: Ala: 20 Acres: Residential (8 units /acre, 100 gpd /capita) Alb: 100 Acres: Residentail (4 units/acre, 100 gpd /capita) Alc: 50 Acres: Commercial (30 Tots, 50 gpd /capita) Aid: 40 Acres: Commercial (25 lots, 50 gpd /capita) Total Loadings including peaking factor and I/I for the entire 210 acre area was 1.44 MGD. I will fax the calculations over for your use. If you need anything else, let me know. Nicole L. Moser, P.E. The Wallace Group (254) 772-9272 (800) 336 -1683 (254) 776 -2924 (fax) »> "Frank Simoneaux" < Fsimonea @ci.college- station.tx.us> 08/26/02 02:33PM »> Our new specs say that the minimum cover is 48" for pipe sizes through 12 "; for 16" and greater, the cover is 72 ". I will mail you the CD with the new details. Thanks for your help with the sewer talcs. Frank 0. Simoneaux, Jr., P.E. College Station Utilities Water & Wastewater Engineer (979) 764 -3592 (Phone) »> "Nicole Moser" <nmoser@wallace- group.com> 08/24/02 10:58AM »> Hopefully this will go through: The information we forwarded to Kim in early June regarding irrigation water estimates is as follows: Assume 2" /week during summer Watering on a 5 day /week basis = 73,800 gpd Watering on a 7 day /week basis = 52,700 gpd I have been working with primarily 2 documents for design of this development, the CS Drainage Policy and Design Standards and the CS Subdivision Regulations, dated October 1995. After some discussion with Bob Mosley, he alluded to some additional design criteria, regarding waterline depth, that I do not see in the standards we have been working with. Is there another design document that I should be using to follow all required regulations? If so, please let me know who I need to speak with to obtain this info. I have two questions regarding sanitary sewer preferences on the project. Right now, we have two drop manholes on the system. I know that some cities do not like to use them and I want to be sure that we put infrastructure in that is suitable to the staff that will be working with the system. Secondly, does the city prefer to have manholes installed above finished grade where manholes are located in undeveloped areas? Typically we required these manholes to be higher than surrounding property so that they can be easily locatied, however, I know that some cities prefer to have them installed at grade for maintenance reasons. fil e: / / C:\ Documents %o20and % 000 \Local %20Settings \Temp \GW ',0000 $!27/2002 AUG . 26 • 02 (SUN) 16: I 1 WALLACE GROUP 2547728691 PACE 1/5 iii ir The Wallace Group, Inc. Eneineera ■Arcrittects. Planners ■ Surveyors FAX COVER SHEE DATE. / • 2C 2 , 1 �` a SUBJECT. J . i TO: p - �� ti ATTENTION: ,` h/ S / 7- # C D _ !f OF PAGES FAX NUMBER: S:91 INCLUDING 6— COVER SHEET. REMARKS: 3 4r7V ( ii&Air 66"7--(1c2e---74ce-zi_4-77 0 A /. • r ....Ii . I• — . /1/L.- G.- . ' FROM: v / C� c_ ".1 ��S . ' Q� - c� P. O. Box 22007 - Waco, Texas 76702 8225 Central Park Drive, Suite 100 - Waco, Texas 76712 (254) 772 -9272 - (800) 3 36 -1683 - Fax (254) 776 -2924 The information contained in this facsimile is privileged and confidential. It is Intended ONLY for the use of the individual or entity named above. If you have received this transmission in error, notify The Wallace Group by telephone (collect) and return the transmission to the above address. AUG. 26 • 02 (SUN) 1 6: 1 2 WALLACE GROUP 2547728691 PACE 2/5 eirimillmsor 7 v . 00 011.1....1.16 e" , .. ,..:V2 U r ..", .1 t t Ili ■ , 0, , • f ' ` � y '' ' I " 1 Q I ..-•: ■e:,= . O '� ��� I . v t \ \ 1 '1 t,\ r l ` \ ' I t i ! I ts -� "� 1 i l l s • 1 1 I / / 1 1 'IP fe' '' V i I \ I c ,''' \ \ '.., '.\... .%, *It• -' / , •,- • •:- 4 ., • \ \ N izbi . .0 „.. \ V 1 I i i /:' t ■ ' " ''' , / h _ .� ♦, ' t \ \ '- 1- '• ` ' . -_ �- ` 1-. -- ... ` %, la 1 , ' ti p s i t r V ' d \ I , 1 `. ` `. '..\ :,, , ' ; y (9 . - � i / \ \, a .. I; \ j 4' t I " ' " . .. ' ..........._ ..... P 1 Y - • p=710. „ , \ ••... , , •., • • p ri, , , . •- 1, l ilti •--- - "" it ) C \ ‘ Iff. ;-.1 Y .. r .-s "-.'• ---"--..-. ... • i • „--/ ) I \ k - \s. ,,, .,,, 2,4, .. c • 1 r ' I 't ' y,'"...,;._-,----.......— / / ti i \ ( �''! �` }1 11 -_•_ /' ri,/ �, Iy � 1 4. -(1 L, , O r ' '� i i • 111 �i, \ a M tL •'off 14E I . AUG 26 '02 (SUN) 16:12 WALLACE GROUP 2547728691 PAGE 9/5 s t »: ''• ice .S .>,:.. .. SEWER CALCULATIONS WORK C12452 SUB AREA FUTURE FUTURE ACRE=AGE POPULATI AREA DESCRIPTION RESIDENTIAL COMMERCIAL (AC) (2.3 Persons UNIT COUNT LOT COUNT (30 Persona/ Ala Residential - 8 units/acre (6,5 units /acre net' 130 0 20.00 _ _ 299,00 _ Alb Residential - 4 units /acre (75 acres net) 300 0 100.00 690.00 Alc Commericlal 0 30 50.00 1500.00 A1d Commercial 0 L 25 T 40,00 1200.00 Ala Residential - 8 units/acre (6,5 units/acre net 230 • 0 35.00 529.00 A2b Residential - 3.5 units/acre (20 acres net) 70 0 20.00 161.00 A2c Commericial 0 18 25.00 750.00 A3 Y Residential 50 0 93.30 115.00 TOTAL 383 81 2- 300 unit hotels /bank/conf center 650 0 56.00 _ 1500.00 B2 Commercial _ 0 7 3.60 108.00 B3 Commercial 0 6 4.63 139.00 B4 - par Atments _ 300 0 9.52 690.00 65 Residential 86 0 14 -33 197.80 86 Residential 60 0 _ 9.70 138.00 - - 87 Residential 78 __._._..- ....... 0 12.91 - __ 179.40 B8 _ par Commercial 0 5 2.96 89.00 B9 � Apartments 300 _ _ 0 8.13 690.00 B10 _ _ Office /Service 0 F � - � _ 18 16,00 480.00 011 Office /Service 0 � 14 8.24 247.00 * B12 ! -- Commercial - 0 - -- _ - _ - 9 6.55 196.00 B13 Office /Service 0 _ 12 11.64 349 814 _._..__..w..... Commercial 0 8 5.93 178 TOTAL 170.1 Cl Office /Service T. _ 0� 58.50 1000.00 01 Recreational Area (Estimated 56 Toilets) 56 0 147.00 1000.00 TOTAL 205.5 El Recreational Area (Estimated 10 Toilets) 10 0 3.50 200.00 E2 Residential 110 0 18.60 294.00 E3 » �� Commercial 0 __ 10.10 303.00 E4 _ Commerclai 0 _ 16.10 483.00 E5 I Commercial 0 17.80 534.00 TOTAL 66.1 AUG. 26 ' 02 (BUN) 16 13 WALLACE GROUP 2547728691 PAGE 4/5 Estimated Loadings based Uppn Table III Bryan College Station Design Manual Population Factor for residential land uses is 2.3 persons /unit AVERAGE LOADING TOTAL AVERAGE P.F.F. PEAK LOADING PEAK LOADING PEAK LOADING PER CAPITA, Qave LOADING, Qave QPAAK (DRY) QPEAK (14) QPEAK (WET) (GPD) (GPD) (GPD) (GPD) (GPD) _.. 100 29,900 3,00 _ 89,700 20,000 109,700 _i____ 100 69,000 3.00 207,000 100,000 307,000 50 75,000 3.00 225,000 50,000 _ 275,000 50 80,000 3.00 180,000 40,000 220,000 100 52 3.00 158,700. 35,000 193,700 100 16,100 3.00 48,300 20,000 68,300 50 37,500 3.00 112,500 25,000 _ 137,500 100 11,500 3.00 34,500 93,300 127,800 ____ 1,055,700 1,439,000 150 225,000 3.00 675,000 56,000 731,000 50 5,400 3.00 16,200 3,600 19,800 50 __ 6 ; 950 3.00 20,850 4,630 25,480 100 69,000 1 : 3.00 207,000 9,520 _ 216,520 100 19,780 I 3.00 59,340 14330 73,670 100 13,800 3.00 41,40.0 9,700 51,100 100 17,940 r 3.00 53,870 12,910 86,730 50 4,450 3.00 13,350 2,960 16,310 100 69,000 3.00 207,000 8,130 215,130 50 24,000 3.00 72,000 16,000 88,000 50 12,350 _ 3.00 37,050 8,240 45,290 50 9,800 3.00 29,400 6,550 35,950 50 17,450 3.00 52,350 11,640. 63,990 50 8,900 3.00 26,700 5,930 32,630 w 1,611,460 1,681,600 50 50,000 3.00 150,000 58,500 W 208,500 10 r _ 10,000 3.00 30,000 147,000 _ 177,000 w 180,000 385,600 10 _ 2,000 3.00 _ 6,000 3,500 9,500 100 29,400 3:00 88,200 18,600 106,800 50 15,150 3.00 45,450 10,100 55,550 50 24,150 3.00 72,450 18,100 88,550 50 26,700 3.00 80,100 17,800 97,900 292,200 358,300 AUG. 26 ' 02 (GUN) 16:13 WALLACE GROUP 2547728691 PAGE. 5/5 • 1 1 W T Z z TIT T1 Zl IV W1 ' jl J -J J J 0 U . : J JIJ 1 J,.J * --.6. 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