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Home My WebLink About47 Autumn Chase Sub 05-19 2304 CoinellAlan Gibbs, P.E. Assistant City Engineer for Development Development Services P.O . Box 9960 College Station, TX 77840 MITCHELL MM MORGAN Re: Autumn Chase Villas Drainage Addendum Dear Alan, 05-bS .:;;-JU-05 J'.d-0 fa~ May 16, 2005 The intent of this letter is to detail changes to the proposed drainage infrastructure described in the Autumn Chase Villas Drainage Analysis, submitted by Mitchell & Morgan, LLP to the City of College Station in December 2004. While none of the Cornell Street infrastructure will be modified, the proposed layout for the Autumn Chase Villas has changed since the last report was submitted, resulting in the need for updated drainage design . The new layout includes the subdividing of Lot 6, Block 2 into several smaller lots. This site design also includes the construction of Autumn Chase Loop, which will serve as the access route to all the lots in this portion of the Autumn Chase Subdivision. The new layout can be seen in Exhibit( of the attached sheets . The proposed drainage system will continue to discharge into the existing detention pond located at the east corner of the property, adjacent to Cornell Street. The drainage design was analyzed in XP-Storm 9 .1.4 just as the December 2004 report was. While the configuration of the Autumn Chase subdivision has changes, the relative amount of impervious cover has not changed significantly. Only a slight variation exists in the postdevelopment flow into the pond between the old and new design, leaving the conditions in the pond and downstream of the Autumn Chase subdivision largely the same, with a slight increase upward for the new layout. The new drainage infrastructure consists of approximately 50 LF of 30" RCP and 308 LF of 18" RCP as detailed in Exhibit C of this addendum. Modeling of the system indicates that these pipes provide adequate conveyance into the detention pond. In addition, the capacity of the proposed 4" rollover curb was analyzed to determine street capacity . This was done using Manning's equation as opposed to the gutter equations in the College Station Drainage Policy and Design Standards (DPDS) because these equations are based on a 6" curb and Manning's was more conservative. These calculations have been provided as Exhibit D. The plan and profile sheet provided as Exhibit C indicates a small stub out located along on of the interior property lines . This stub out will serve the future development of the property by providing access to the drainage system . The property was analyzed at estimated full development levels and as such, some drainage assumptions were made to account for all of the flow into the detention pond. An updated drainage area map has been provided as Exhibit B of the report. The current site configuration has only two inlets on it ; one 5' recessed inlet at the southwest corner of the property and on 1 O' recessed 511 UNIVERSITY DRIVE EAST, SUITE 20 4 • COLLEGE STATION, TX 77840 • T 979 .260 .6 963 • F 979 .260.3564 CIVIL ENGINEERING • HYDRAULICS • HYDROLOGY • UTILITIES • STREETS • SITE PLANS • SUBDIVISIONS info@mitchellandmorgan.com • www.mitchellandmorgan .co m inlet at the southeast corner of the property, adjacent to the detention pond . Flow from the north end of the property will be conveyed in the streets and within the Right-of-Way for the 100-year event. The project will continue to meet the drainage objectives of the College Station DPDS . If you have any questions or comments, please feel free to contact either Veronica Morgan or myself at 260-6963 . Sincerely, ~~ ~ty-- Terry M . Barr, E.l.T, C.F .M Graduate Engineer Cc: File Dan Bensimon, Owner "O ~ c 0 ~ "S a. E wo ..... (.) ..... (/) co -..... ,..._ Q) C') Q) 0) .~ . Cl 0 c zw ,J:J VTUf'1 ty CH PJ ~ £ !tOD.ICN CU & ::.. 'CAPIKJT'( CCF-S_) 2.~ fe.l:CIPf/!!.t>C>Jl, O/; CRC)SS SU '£ ,., ~ "'(~J..ir-JJ>V6'S ~ovt;,J.fNES!S .S • Lt:JN~ 1rLJDI "/!¥-.s 1-i>PIC; 0 :_ IYC.PTf-{ ( FT) A ~£PTJ...f ,if DUTJ-/ vA-f?.'rtrlG OF /j-::.t:J."&75 F( FOR. A lo-'r£.A-~ tNEA/T A"/IJ o~ /);:;.. fJ.SO FT Fote A 100-rEl't'< £\IEJ.IT ,+!../{.) t-0NI;,ITV_Ol"4~'--..$LOP6$ ~ (). '1 D.7, tJ.C/F I· ?..8 () l!Pn( () .::. IJ . '37 5 FT ( ((7 -}cAiC-_) c-("CP-S C,,C"f ". 58 7-lo/ 'l H.ES DEPTlf !J -=:. () •• S-D D l {00 -)"IE~) PAC (t:-.e'S) 13. 03 /~. zo lb. 12. 1'6 ."'/S TH!.O~ i~UE.s IU.PUS EJ.,J'f' o~~ S.tD€ o,:::-A c ~vi,.../"/ £.-i::> .s £C...-77oAJ /J; D. ~75 i:r A= ; . 11 .rct F-T _/( s-9.1s7 r;r ()~ o.So !=T A " -3. 93 S&FT R=().~781=T bt.PrJi D= 0. :175 F=T C 10-Y€AR.) 0-6"/ IJ. 7(, o .~e /, 2~ '-/. I:;_ -'-{ • L.f 't 5. 05 5. 'i.3 Cc. ~ c.-CAPACrry (CPS) n =-'1A~N1._J &o.s ~V61-/r-J c:ss A-=: c~-.S.€CTioNitL-A~.A G r-) R__ .;;. HYD'1!f:t-Ul-fc., leA--~'V.S c FT) .S -= LON~ITU~l"'Al-.Sl,...of»Jt., (J~PTl-f fJ;; P.6 -o D ([90 -'(£.A~ t1. o~ /'<.. 0 g 13 ,-57 /'5.l:,1 Cr~ Carol Cotter City of College Station Planning & Development Serv ices P.O. Box 9960 College Station, TX 77842 MITCHELL MM MORGAN Re : Autumn Chase (FP) # 05-00500085 Dear Caro l, June17,2005 We have reviewed and answered your commen t s. Please fi nd attached w ith this letter: • Two (2) sets of rev ised construction drawin gs • Fire Flow report y u have any quest ions or comments, please feel free to contact us . Thank you. Cc: File Dan Be nsimon 511 UNIVERSITY DRIVE EAST, SUITE 204 • COLLEGE STAT ION, TX 77840 • T 979 .260.6963 • F 979 .2 60.3564 CIVIL ENGINEERING • HYDRAULICS • HYDROLOGY • UTILITIES • STREETS • SITE PLANS • SUBDIVISIONS info@mitchellandmorgan.com • www.mitchellandmorgan.com Carol Cotter COCS-Development Services P .O . Box 9960 College Station, TX 77840 MITCHELL M M MORGAN R e : Autumn Ch ase (FP) -05-00500085 Dear Carol , June 20 , 2005 The following are our res ponses to the City 's comments for the Final Plat for Autumn Chase. Planning/Engineering;: Comment: Provide Grading Plan. Answer : Contour lines have been shown around ROW 's and min FF's have been added to the plans . These contour lines have been calculated based upon the attached hand calculations, which were submitted, on 5116105 to Alan Gibbs with the Autumn Chase Villas Drainage A dd endum. As you can see these are depth calculations for the 100-year storm for each of the street grades . Since we are using a 4" curb we calculated the allowable "Q" in the gutter with the 4" height as well as the 6" height. Below is a chart showing the drainage area, Q 100 , street grade and capacity with 4" curb and 6" ROW depth. As y ou can see that the Q l 00 is kept within the ROW if it is graded 6" above the gutter line . The contours at ROW shown on sheet Ol are 6" above the gutter. Ata: 1 (!lflfJ Srnu:r Srut:Tt Stuu:r PAJ 8.2 CFS PA2 1.39 CFS PA3 1.96 CFS PA4 3.3 CFS PAS 2 .77 CFS PA6 5 .29 CFS PA7 4 .24 PA8 1.63 CFS PAJO 1.44 CFS PAll 3.45 CFS+ 1 CFS (driveway) PA12 .34 CFS PA13 1.5 CFS PA14 2 . 75 CFS-1 CFS (driveway offsite) <tu w1: c II' I C/IT If ! c II' I C/IT 1.28% Off site .78% Gate NIA .78% .98% .98%, .64% Gate NIA Off site .78% Off site Off site Off site ./ '' Cl IW If I/ II 6" /)U'/ 11 5 .83 15 .67 NIA NIA 4.49 12 .08 NIA NIA 4.49 12.08 5 .05 13 .57 4 .12 11.09 NIA NIA NIA NIA 4.49 12 .08 NIA NIA NIA NIA NIA NIA 511 UNIVERSITY DRIVE EAST, SUITE 204 • COLLEGE STATION, TX 77840 • T 979.260.6963 • F 979.260.3564 CIVIL ENGINEERING • HYDRAULICS • HYDROLOGY • UTILITIES • STREETS • SITE PLANS • SUBDIVISIONS info@m1tchellandmorgan.com • www.m1tchellandmorgan.com Comment: Answer : Comment: Answer: Comment: Answer: Comment: Answer: Comment: Answer : Comment: Answer: Comment: Answer: Comment: Answer : Comment: Answer: Re-title Sheet 08 to Erosion Control Plan Sheet has been re-titled. Minimum separation between water line crossing under a sewer line is 1 foot between sewer line and encasement pipe . We believe we have a foot separation at these locations. If there is still a question please let us know what water line and station where there is a question . Provide construction documents for 3-inch water mains to meter banks . Plan and profiles of all 3-inch lines have been added. Use actual flow data from existing area hydrants in the fire flow analysis Please see attached letter. Show tie-in of 4" lay down curb to ground to insure that depth of water in street stays within ROW. See answer to the first comment. Is an eyebrow needed on the northwest curve of Autumn Chase Loop ? Justify . No, please see attached turning radius sketch. What are you proposing for traffic safety/circulation at the southeast intersection? Striping? Stop signs? We are not proposing any striping or stop signs here as the City on past projects indicated to us that they want to handle that aspect of the project. (i .e . on Kenny Cotton project we were required to remove our striping/signing plan for Dartmouth). Revise construction documents to reflect staff review comments returned on plats regarding water and sewer lines . The water line has been extended to the property to the west as requested . Move HC ramp to intersection. The ramps have been moved . k you for your cooperation on this project. Please let us know if you have any questions. Cc: Dan Bensimon File "O &. c: 0 ~ ":] c. E wo ,... (.) (). ''I D. l,. fJ.'il' /.. ~8 "* UTU~ ,Y CH r, ~ £ It DD~ "I DIJ C,,C"f " . 5"-4 7-1-1 s.. r.~ _m,_;:.. r ~~ CCJ""S_) z.~ fel:.Cl~C~ ~/;-CR()S:S SU> h c /'-f lr~~IJ:lfi;.S R..OV-.J.fNES!S. .s • LDN' 1Tf)()l 1'/_"-.$.1..J)P~. I;)·;_ IYC.PTI-{ ( FT) ()EPnf () .:::. tJ .,S-o T:> l(DO-°)"E~) C I (t!/:-5) 13. 03 l"f, zo /p.a .. Ii. 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Rl!Uft -~ ......... -ti) -~ 0 -...J <( -...J 0::: S: ~ lw ti) u ~ :::> (_) 0::: I-< w ~ 0::: 2 LL ~ ~ Of 1 Sheets Carol Cotter City of College Station Planning & Development PO Box 9960 College Station, TX 77840 MITCHELL MM MORGAN RE: Fire Hydrant Test for Autumn Chase Subdivision Dear Carol : June 7, 2005 In December 2004 a hydrant test was run for the Autumn Chase Subdivision per your comments on a November submittal. At that time we completed a MikeNET analysis to compare the City of College Station water model to actual hydrant flow data . We believe that we relayed the results to you verbally, but we do not have any written correspondence for this comment. Please see the table below for a comparison between the results of the MikeNET analysis and the hydrant flow data . For your convenience I have attached the flow test report to this letter . Method Static Residual Demand Flow Test 99.0 si 96 .0 si Mike NET 100 .1 psi 91.3 psi Based on the above results, we believe that the MikeNET model is a good approximation for real flow conditions. If you have any further comments or questions please feel free to contact me . Sin~~ Rebecca A. Riggs , EIT Graduate Engineer cc. file Attachment: Hydrant Flow Test S:\Proj\0458-Autumn -Chase-Vi llas-NE'Mdocs\0458-hydrant-test-0506 07.doc 511 UNIVERSITY DRI VE EAST. SUITE 204 • COLLEGE STATIO N. TX 77840 • T 979 260 .6963 • F 979 .260.3564 CIVIL ENGINEERING • HYDRAULICS • HYDR OLOGY • UTILITIE S • STREETS • SITE PLANS • SUBDIVISIONS info@m itchellan d morgan .com • www.mitch el landmorgan .com . -06/06/2005 08:50 FAX 979 764 34r COLLEGE STATION PUB.UTL . (f/j.. College Station Utilities RelL1hk, Affordable, Community Owned 1601 GRAHAM ROAD COLLEGE STATION TEXAS 77845 Date:-23 DECEMBER 2004 {o Ull A./ Z ~ s Number pages including cover sheet -1 Fax to: 260-3564 Attention: REBECCA Company: MITCHELL AND MORGAN From: Butch Willis Water Wastewater Division Phone: 979-764-3435 Fax: 979-764-3452 FLOW TEST REPORT Nozzle size: 2.5 inch Location: 2316 CORNELL Flow hydrant number: E-142 Pitot reading: 70 (GPM): 1405 Static hydrant number: E-14 Static PSI: 99 Residual PSI: 96 Iii! 001 h/7/<J~ CITY OF C OLLEGE STATI ON Planning d-Dewloprnent &rvico SITE LEGAL DESCRIPTION: Autumn Chase Subdivision Lots 1-13 , Block 3 Lots 1-6 Block 4 DATE OF ISSUE: 06/21/05 OWNER: Dan Bensimon 5810 Tom Wooten Drive Austin, Texas 78731 TYPE OF DEVELOPMENT: SPECIAL CONDITIONS: DEVELOPMENT PERMIT PERMIT NO. 05-19B FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA RE : CHAPTER 13 OF THE COLLEGE STATION CITY CODE SITE ADDRESS: 2304 Cornell Drive DRAINAGE BASIN: Main Bee Creek VALID FOR 3 MONTHS CONTRACTOR: Full Development Permit All construction must be in compliance with the approved construction plans All trees required to be protected as part of the landscape plan must be completely barricaded in accordance with Section 7.5.E., Landscape/Streetscape Plan Requirements of the City's Unified Development Ordinance, prior to any operations of this permit. The cleaning of equipment or materials within the drip line of any tree or group of trees that are protected and required to remain is strictly prohibited . The disposal of any waste material such as , but not limited to , paint, oil , solvents, asphalt, concrete , mortar, or other harmful liquids or materials within the drip line of any tree required to remain is also prohibited . ****TCEQ PHASE II RULES IN EFFECT**** The Contractor shall take all necessary precautions to prevent silt and debris from leaving the immediate construction site in accordance with the approved erosion control plan as well as the City of College Station Drainage Policy and Design Criteria . If it is determined the prescribed erosion control measures are ineffective to retain all sediment onsite , it is the contractors responsibility to implement measures that will meet City, State and Federal requirements . The Owner and/or Contractor shall assure that all disturbed areas are sodden and establishment of vegetation occurs prior to removal of any silt fencing or hay bales used for temporary erosion control. The Owner and/or Contractor shall also insure that any disturbed vegetation be returned to its original condition, placement and state . The Owner and/or Contractor shall be responsible for any damage to adjacent properties, city streets or infrastructure due to heavy machinery and/or equipment as well as erosion, siltation or sedimentation resulting from the permitted work. In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction, erosion , and sedimentation shall not be deposited in city streets , or existing drainage facilities . I hereby grant this permit for development of an area outside the special flood hazard area . All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer in the development permit application for the above named project and all of the codes and ordinances of the City of College Station that apply. Date Date Item No. Quantitv Units 1 1 LS 2 4 EA 3 1500 LF 4 4 EA 5 3000 CY 6 2293 LF 7 3033 SF 8 3033 SY 9 4040 SY 10 4875 SF 11 808 LF 12 4 EA 13 6 EA 14 3 EA 15 8 EA 16 2 EA 17 150 LF 18 889 LF 19 1 EA 20 2 EA 21 1 EA 22 3 EA 23 4 EA 24 2 EA 25 3 EA 26 7 EA 27 2 EA 28 36 LF 29 1 LF 30 1 LF 31 322 LF 32 28 LF 33 1 EA 34 1 LF 35 50 SF 36 2 EA 37 1 EA 38 1000 SY 39 10000 SY 40 LS ENGINEERS ESTIMATE FOR AUTUMN CHASE SUBDIVISION Descriotion & Unit Price in Words Unit Price GENERAUELECTRICAL ITEMS Mobilization & Traffic Control $10 ,000 .00 Street Lighting $3,500 .00 Electrical Condu it $4 .50 Transformer Pads $400.00 ROADWAY ITEMS Earthwork, Including Import and Export $8 .00 Tvpe Ill Curb $9 .00 2" HMAC $6 .00 6" Crushed Limestone Base $10.00 Lime Stabilized Subbase $2 .00 Concrete Sidewalk & Ramps $3 .00 SANITARY SEWER ITEMS 6" San itarv Sewer $35 .00 Sewer Manho le $2 ,300 .00 6 " Sanitary Sewer Service (< 25') $1 ,200.00 6" Sanitary Sewer Service (> 25') $1 ,800 .00 4" Sanitary Sewer Service(< 25') $900 .00 4" Sanitary Sewer Service (> 25') $1 ,200 .00 Remove Ex. Sewer Svstem $5.00 WATER LINE ITEMS 6" PVC Water Line (AWWA C909) $30 .00 Fire Hydrant $2 ,000 .00 Connect to Ex . 6" Line $500.00 6" x 90 M.J. Bend $200.00 6" x 45 M.J. Bend $200.00 6" x 22 .5 M .J . Bend $200 .00 6" x 11.25 M.J. Bend $200 .00 2" Water Service ( < 25') $800 .00 2" Water Service (> 25') $1 ,100.00 1.5" Water Service (> 25') $900.00 14" Steel Casino $40 .00 STORM DRAIN ITEMS 5' Recessed Storm Dra in Inlet $2 ,000 .00 10' Recessed Storm Drain Inlet $2 ,500.00 18" Cl Ill RCP Storm Dra in $40 .00 30" Cl Ill RCP Storm Drain $70.00 30 " x 30 Deoree RCP Bend $560 .00 30" Sloped Headwall $1,400 .00 Remove Ex. Cone Flume $4.00 30" Junction Box $1,500 .00 72" Junction Box $3 ,500.00 POLLUTION PREVENTION ITEMS Sod in developed areas $8 .00 Hvdro Seedino in undeveloped areas $2 .00 Storm Water Pollution Prevention Implementation $4 ,000.00 Base Bid Subtotals: Total Price $10 ,000 $14 ,000 $6,750 $1 ,600 $24 ,000 $20 ,637 $18,198 $30 ,330 $8 ,080 $14,625 $28 ,280 $9,200 $7,200 $5,400 $7 ,200 $2,400 $750 $26 ,670 $2 ,000 $1 ,000 $200 $600 $800 $400 $2 ,400 $7,700 $1,800 $1,440 $2 ,000 $2,500 $12,880 $1 ,960 $560 $1,400 $200 $3 ,000 $3 ,500 $8 ,000 $20 ,000 $4,000 GENERAUELECTRICAL ITEMS $ 32 ,350 ROADWAY ITEMS $ 115 ,870 ;' ""--J ./ """'~ •• •• 1 ~'11 STORM DRAIN ITEMS $ 28,000 ~, .: ~ .......... :·. ···"I. POLLUTION PREVENTION ITEMS $ 32 ,000 ~ .. ··•···• 'B MUt1\.:ll"I~?. $ ~" :'."l'\t.I~~~ .~: .. : ·······~ ~·-· :)\······ '117689 /~'"~ Grand Total $ 313 ,660 i~~_.:.i.:..;::::..:_..,......,~~~~L.-~~~~~~-;-~~~~~~~--'~~~~~~-'-~~~~-'---' '" ~. '9 «,"'··~ ~r I 11 0~·· .. f°GtsT~~./(}' • r ? 'J.o 0'5 ····~~.s;0N·A~ ~'tfi 1 A •... -e < ~[) ~ ,,,,_,.,, ......... I~ .. ~ Page 1 of 1 ~. J .... ,.,, ) CITY OF COLLEGE STATION Plan11ing c!r Development Servicu SITE LEGAL DESCRIPTION: Autumn Chase Subdivision Lots 1-13, Block 3 Lots 1-6 Block 4 DATE OF ISSUE: 06/21/05 OWNER: Dan Bensimon 5810 Tom Wooten Drive Austin , Texas 78731 TYPE OF DEVELOPMENT: SPECIAL CONDITIONS: DEVELOPMENT PERMIT PERMIT NO. 05-19A FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA RE: CHAPTER 13 OF THE COLLEGE STATION CITY CODE SITE ADDRESS: 2304 Cornell Drive DRAINAGE BASIN: Main Bee Creek VALID FOR 3 MONTHS CONTRACTOR: Clearing and Grading Permit All construction must be in compliance with the approved construction plans All trees required to be protected as part of the landscape plan must be completely barricaded in accordance with Section 7.5.E., Landscape/Streetscape Plan Requirements of the City's Unified Development Ordinance , prior to any operations of this permit. The cleaning of equipment or materials within the drip line of any tree or group of trees that are protected and required to remain is strictly prohibited . The disposal of any waste material such as, but not limited to, paint, oil , solvents, asphalt, concrete , mortar, or other harmful liquids or materials within the drip line of any tree required to remain is also proh ibited . ****TCEQ PHASE II RULES IN EFFECT**** The Contractor shall take all necessary precautions to prevent silt and debris from leaving the immediate construction site in accordance with the approved erosion control plan as well as the City of College Station Drainage Policy and Design Criteria. If it is determined the prescribed erosion control measures are ineffective to retain all sediment onsite , it is the contractors responsibility to implement measures that will meet City, State and Federal requirements . The Owner and/or Contractor shall assure that all disturbed areas are sodden and establishment of vegetation occurs prior to removal of any silt fencing or hay bales used for temporary erosion control. The Owner and/or Contractor shall also insure that any disturbed vegetation be returned to its original condition, placement and state. The Owner and/or Contractor shall be responsible for any damage to adjacent properties, city streets or infrastructure due to heavy machinery and/or equipment as well as erosion , siltation or sedimentation resulting from the permitted work. In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets , or existing drainage facil iti es . I hereby grant this permit for development of an area outside the special flood hazard area. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer in the development permit application for the above named project and all of the codes and ordinances of the City of College Station that apply. 06-.:::?l-OS- Date (o/2.3/65 Date JUL-~8-03 MON UNIQUE STRATEGIES FAX NO. 51~7958431 P. ~ WI.I~ --·"~'U• ~"'""'*'vu~ VI' •Y~ ~..,_,.., y t V'MVVVYV S aa& •va&&..1&.1~ ·-- TCEQ Office Uge Only .,.. Notice of Intent (NOi) for Storm Water Discharges i"" ~ As~o<:ilated with Consbuclion Activity under the -TPDES Construction General Pennlt (TXR150000) T~Q For help cqrnpletlng thi$ llpplt~\ion, read 1he TXR1SOOOO NOi ln,trucllons TPDES Permil Number: TXR15•~·!..:!....•:_•~ NO GIN Numbe r :•:_•:_•:_•'!_·~-·:_•:_•• I '-Iii (TCEQ.2002:2-lni;truciior\5). ~~~~~~~~~~~~~~~-~---~ A. Con!ltrucllon Sil• Operator ~New DNo Change customer Rererenr.e Number. CN ___ , _____ _ Name :J>an ftcn.slmov _________ • ·----~~-------~--·---- Maillng Mdtees:_!.~9.J!l.W!l_ottn PriY$ Ci\y ; Aue Do __ state:.lK.__Zip Code:lU.lL....._ Country Mailing tnrormalion (ifwlSA1$ USA) nmilory: --~-Counby Code:____ Poe\al Codo: __ _ Pliont Numb&: (51l).33§·il25 _Ext.en3lon: _____ . __ ., __ Fax tlumbar:_ _!lil21 IPS·Jfil..---·-·- &mail Add<a$s:Ji!;>.fnslmo11~swell.ML,_,~~------·-·-·~- TVPe ofOpernlor: 00 todivid1.1al 0 Sole Proprietorship-0.8.A. 0 Partnership D Corpora~on D Federal Govemn'leOI 0 Slate Government 0 County Govemmenl 0 City Governmanl D Other: ______ .-·---------··----- Independent Operator? 1!J Yea 0 No Number of Employ~; l!!l O.ZO D 21-100 D 101·250 El 251-500 0 601 or higtier Fe<11m1tTax ID: _slate Franohise Tex IO Nu~:_____ _DUNS Number: ___ _ B. Billing Address Name:~n Bt!)iimon ------------·. . .. ·-----·~--~----------~---~-~ Mailing Addr~: ~810 To~_x.i_g~n Orln. ______ City; Auatin., __ ., __ St«le;.~ZJp COdll: 7473j __ Coontty Mailing tnlormallon (ii outtide USA) Territory:_ _Country Code; -·-~----~Poelal Code: __ c. Ptaj1tel I Sit• Information DNew 0No C!langa Regulated Eolity Refattoo11 Number: RN~-·-·------- Name: Dan Btl\!lilmon -------------·-·---·-·-~-·-·-----~---- Melling Addreaa:.ll!D Tom Wool•!!~--~~------Clty;J.ustin Slate:.!!_ Zip CQde:_t!!ll_ __ _ Phy:\lcal M<Jren:~k2m!!J. Drjve City: Colltqe Sla!lori •. County; ISRAZOS ZlP Code :.J..~_J4~Q.,__.....~ Location AcC4s3 OasCl'iption;J:f2!1.~ ComeJJJ!rlv• at BC!ntwo~ Drive -----·---·----------- leob'ludo:~_!L •-~·•AR N Longlu.lQe;,.!.!. • ...1!..' ~I!." W Degrees(•), Mlll\ltes ('J. and Seconds(") La.UllJde ; __ Longilud&; - _ DflClmal Form standard lndu~!tial Clas.c;rncanon (SIC) code; ~-Also, describe Ille oonstruC1ion eclivlty el Iola ail$ (do flOt rew.11t1e SIC eode): ___ .._ ___ ... _____ ~-~-------··-·------------------~~-.._--... Has a etorm water polu1ion i:irevan1ion ph"' b~ propar.ad u ~podliod in lho gcne1-.,I 1Jn11nl1 (TXft1~ooor1 l!JYes LJ No Ealimaled area of land dlalurbed (lo ~e riea.ritst acre):_a.4 __ ls lfle project/ site local11d 1m lndl~ Country L11nds? CJ Yes II] No Does lhl$ project/ elte dls~ge atorm water loto 8 munldpal s&pgrate alorm sewer aystern (M~)? llJY•i; tJ No If yes, provide Iha nama of lhe MS4 operalor:J!1!_9i\V.2Uloll.!Sla Sia lion _________ ~----·-----~--·-- Provide the neme OI' segment number of the wa!QI' body that rec:eives slorm wat41rflom Ihle proJ11ct J alt&:j:a!!!rs Cr~ D. Contact -If lhe TCEQ needs addttion.i lnrormaliol'I regarding lllia applicalioo, who should be contacted? Name: Dan Bensimon --·------Title: Owner Phone-,;;,;;; 1s1:aP_1~-1,22s ____ EJIJ.e."13100: _:--=...F";x ~;;;=_:-..:_ <s1ap~e4:i1-.=~~~ E-mall.Address:.dben&lmon@~.1.net -----~·---- E. Payment lnformaUon • Check f Money OrrlAr N1 1mb61':,__ N;l1t10 on Ch~k I Mone>-Ot~; ;;.:__..;....:,.;:.,........:..;.:;.,;;,,;;.~__::..:...;.;..__;,_;..:.;.;...;_.~,:_~~----"=:.:===~==-~- F. Certification I cenlfyund4r penally off aw thal :his dccumenl waa prepa:e<l tmder rnydltfctlon or cuparvl&lon 1n •ccor<lanee with a system designed 1o G$&11te tllil quali~ed per.iOlll\.t propor1'J llalhttr .nd evaluate\M Information aUblhltted . Band on my illqutryof lhc: pe~Dtl « perwns who m.n11g11 tit• •Y11em, Dr l\oH pauorn1 Cltreclly r~pol\S:bl• for ga111e11n9 lheklromi•tlon. Iha inlorl!lllllon submltt11d is, to the beat of rnv kllewledge and beDef, 1r11•. •cc:urai., and complelll. I al'I sware 1held 111"9 .-.11111cant P8"'-hles 9or 51,1b1111t\lni1 lat-.., hfor11111ion, lrie1Udlng the possibility of fin& and lmplfaonrnerrt b' knowine vlolatio~ Cons1r1.1etlon Sita Operator Representative: Prefi>C Firs!:_~,--------· _Middle;_~-·--·--~---·---~ Last:___ _ __ Sulli:xi-----~ Tltte: __ . _______ __..,..._ ___ , ____ , Slonalure: ---,~7t::~9----yC--#----::;~------.:::::..-:::::----Date : 7 -Z ..J'. ~ CJ 3 Ir you have ciuos Ofl ~ow onl or about the eiormwa:er progr&rn, pltai• <10n1aol ua 11t (S12) 23~eri . lndivt®abaraen:illad to requutand revlew11t111tpel"30011 lnrC>mlatlon ltlittttJe •oencvo:itheri o~ !IS farms . Thay may 11$011av11 :uiy eno1s In their lnl'orm3\lon corrected . To 18View .ueti lnl'Drmetion, contact u1 e.1 (512) 239-3282. TCeQ-20022 (02/03) Tha i;omplels:t NOi must ba mailed to 11111 fo11ow1ng address . Usa lhe attached docun1ont lo submit !he $100 11pplkaUon fn. P!Qase nQ!e !hat the NO! and applice.tion fee ar11 l'Jbmltted ~para.lely to different addres541e . Texas CoJTVnletlon of! EnvlronmtNtt•I Quality Storm WalQf & General Permit& Team: MC -228 P.O. Bax 13087 Auclin, Texas '111711·3067 Carol Cotter City of College Station Planning & Development PO Bo x 9960 College Station, TX 77840 MITCHELL MM MORGAN RE: Fire Hydrant Test for Autumn Chase Subdivision Dear Carol: June 7, 2005 In December 2004 a hydrant test was run for the Autumn Chase Subdivision per your comments on a November submittal. At that time we completed a MikeNET analysis to compare the City of College Station water model to actual hydrant flow data . We believe that we relayed the results to you verbally, but we do not have any written correspondence for this comment. Please see the table below for a comparison between the results of the MikeNET analysis and the hydrant flow data . For your convenience I have attached the flow test report to this letter. Flow Test and MikeNET Comparison Residual Demand Method Flow Test MikeNET Static 99 .0 psi 100.1 psi ~~~~~-+--~~~~~~---< 96 .0 psi 1405 gpm ~~~~~-+--~----""----~~~----; 91.3 psi 1405 gpm ~~~~~~~----""----~~~~ Based on the above results, we believe that the MikeNET model is a good approxi mation for real flow co n ditions . if yo u have any further comme nts or questions pleas e fee! free to con tact me. Sin ~~ Rebecca A. Rigg s, EIT Graduate Engineer cc. file Attachment: Hydrant Flow Test S :\ProJ\04 58 -A utumn-C hase -Vil las -N EVv\docs\04 58-hydrant-te st-050607. doc D~ .. \ct L\ 511 UNIVERSITY DRI VE EAST, SUITE 204 • COLLEGE STAT ION, TX 77840 • T 979 .260.6963 • F 979 .260.3564 \.,~ lo · 'b -o'S CIVIL ENGINEERING • HYDRAULICS • HYDROLOGY • UTILITIES • STREETS • SITE PLANS • SUBDIVISIONS info@mitchellandmorgan .com • www mitchellandmorgan .com 06/06 /2005 08 :50 FAX 979 764 3452 COLLEGE STATION PUB .UTL. fl~{ College Station Utilities ~ Reliablf, Affo1·d11ble, Community Owned 1601 GRAHAM ROAD COLLEGE STATION TEXAS 77845 Date:-23DECEMBER2004-{o ;;-t..1/UZ ~ ~ Number pages including cover sheet - 1 Fax to: 260-3564 Attention: REBECCA Company: MITCHELL AND MORGAN From: Butch Willis Water Wastewater Division Phone: 979-764-3435 Fax: 979-764-3452 FLOW TEST REPORT Nozzle size: 2.5 inch Location: 2316 CORNELL Flow hydrant number: E-142 Pitot reading: 70 (GPM): 1405 Static hydrant number: E-14 Static PSI: 99 Residual PSI: 96 ~001 fo/7 j ()r- Alan Gibbs , P.E. Development Services P.O. Box 9960 College Station, TX 7 7840 MITCHELL MM MORGAN RE: Autumn Chase Subdivision-Fire Flow Analysis Addendum Dear A lan: May 16, 2005 Below is the water analysis for the A utumn Chase Subdi v ision . Domestic flows were calculated using the Normal Flow method 2 as presented in the February 2004 B/CS Unified Design Guide lines . The townhomes and duplexes consist of 56 total units, requiring a peaked domestic flow of approximately 41 .5 gpm . The largest possible townhome building is 5903 square feet, with firewalls constructed per bu ilding code between units (a ll owing a reduction in square footage to 1,500 square feet for the fire area) requiring a fireflow of 1500 gpm per the 2000 International Fire Code. A building type of V-B is projected as our build ing t ype. The fireflow required to ser ve this proj ect is sma ll enough that only one fire hydrant is required . Please see attached excerpt from the 2000 International Fire Code (Exhibit 1 ). Using the updated College Station w ater system mode l in MIKE NET, a domestic flow of 41.5 gpm, and a fire flow of 1500 gpm, flows and pressures in the lines adjacent to the hydrants are as follows: Item ID Demand Pressure Flow Veloci t Junction 2087 1541.5 gpm 78.12 psi NI A N/A (H d rant) Pipe2461 (6") N/A N/A 864 .7 gpm 9 .8 fps Pipe 2469 (6") N/A N/A -676 .8 pm -7 .7 f s Please see the attached M IKE NET report for pipe and junction loca t ions as well as additio na l resu lts (Exhib it 2). 511 UNIVERSITY DRIVE EAST, SUI TE 204 • COLLEGE STATION , TX 77840 • T 979.260.6963 • F 979.260.3564 CIVIL ENGINEERING • HYDRA ULI CS • HYDROLOGY • UTILITIES • STREETS • SITE PLANS • SUBDIVISIONS info@mitchellandmorgan.com • www.m1tchellandmorgan.com The hydrant and proposed lines are sufficient for the fire flow requirements for the Autumn Chase Subdivision. In the analysis flows were kept below 12 fps and pressure remained above 20 psi, as per the B/CS Unified Des ign Guidelines Manual. If you have any further comments or questions please feel free to contact me. cere1y, _ ...... ;'toF"~~'''• ~.(,..,,..,. .. *·"""·····:;+-""-.,, ; .. ..... ·· ... u-. ''· ~ * ... .... * ~ ~ 1"'eAONicA'j:e:·MORG.AN~ l~~········:,·168'9''''''''/fi! V . M o ··.~ <)/!ii~ eronica . . g . ~ ... ~a1srE~~ ... · ~ -,, ''& ... .. ~ .:' Managing Partner ''\,s1c)'NAL·€.~--..:- S(1lP f~?"''~ cc: file Attachments S:\Proj\0458-A utumn -Chase-Villas-NEW\docs\0 45 8 -fireflow-u pdate-050516 .doc ARE-FLOW REQUIREMENTS FOR BUILDINGS TABLE B105.1 MINIMUM REQUIRED FIRE FLOW AND FLOW DURATION FOR BUILDINGS FIRE AREA ,_,.,.. teetl Type IA Ind 1119 Type llA Md lllA" Type IV end V-A" Type UB and ma" 1'VDe v-B" 0-22,700 0-12,700 0-8,200 O-S,900 0-3,600 22.701 -30,200 12.701-17,000 8,201-10,900 S,901-7,900 3,601-4,800 30,201-38,700 17,001-21,800 10,901-12.900 7,901-9,800 4,801-6,200 38,701-48,300 21,801-24,200 12.901-17,400 9,801-12,600 6,201-7,700 48,301 -59,000 24,201-33,200 17,401-21,300 12.601-15,400 7,701-9,400 59,001-70,900 ,.--33;to f .:j9,70ct 21.301-25.SOO 15,401-18,400 9,401-11.300 70.901-83,700 39,701-47,100 25.SOl-30,100 18,401-21,Soo 11.301-13,400 83,701-97,700 47,101-54,900 c3o.ro1~5.iOQ 21,801-25,900 13,401-lS,600 97,701-112.700 54,901-63,400 35,201-40.600 25,901-29,300 15,601-18,000 112.701-128,700 63,401-72,400 40,601-46,400 29,301-33.SOO 18,001-20,600 128,701-145,900 72.401-82.100 46,401-52.500 . . 33,501-31,900 20,601-23.300 145,901-164,200 82.101-92,400 52.SOl-59,100 37,901-42.700 23.301-26.300 164.201-183,400 92,401-103,100 59,101-66,000 42.701-47,700 26,301-29.300 183,401-203,700 103,101-114,600 66,001-73.300 47,701-53,000 29.301-32.600 203,701-225,200 114,601-126,700 73.301-81,100 53,001-S8,600 32.601-36,000 225.201-247,700 126,701-139,400 81,101-89,200 58,601-65,400 36,001-39,600 247,701-271,200 139,401-1S2.600 89,201-97,700 65,401-70,600 39,601-43,400 271,201-295,900 152.601-166.SOO 97,701-106.SOO 70,601-77,000 43,401-47,400 295,901.r--·-166.SO I-Greater 106.SOl-1 lS,800 77,001-83,700 47,401-Sl.SOO --115,801-125.SOO 83,701-90,600 51.SOl-SS,700 --12S.S01-13S.SOO 90,601-97,900 5S,701-60.200 --13S.S01-14S,800 97.901-106,800 60,201-64,800 --14S,801-1S6,700 106,801-113,200 64,801-69,600 --1S6.701-167,900 113,201-121.300 69,601-74,600 --167,901-179,400 121,301-129,600 74,601-79,800 --179,401-191,400 129,601-138.300 79,801-SS,100 --191,401-Grcater 138,301-Grcater 85, l 01-Grcater For SI: I square foot -0 .0929 m2, I gallon per minutc • 3.78S Um, I pound per square inch., 6.89S kPa. L Types of con..;truction arc based on the lnl~rnariONJI Building Cod~. b. Measured at 20 psi . ARE FLOW FLOW taallona _,. """"'9)~ DURATION (hours) l.SOO l,7SO 2.000 2 2.2SO 2.500 2,7SO 3,000 3.2SO 3 3.SOO 3,7SO . 4,000 4,2SO 4.SOO 4,750 5,000 5,2SO s.soo S,1SO 6,000 4 n ;;.---, 6,2SO _ 6 .soo 6,7SO 7,000 7,2SO 7-500 7,7SO 8,000 ... --··--• --·--·· ·---# .. _,_ --.... ( -t 358 20001NTE EXHIBIT 1 fireflow-051605.GDB Analysis Type: Steady State Project Description: Autumn Chase Villas , fireflow of 1500 gpm / / ~ / > / EXHIBIT 2 Results -Junctions Number of Junctions: 13(Selection) Junction ID Description Elevation Demand Grade Pressure [ft] [gpm] [ft] [psi] 167 J-8580 298.000 0.000 506.467 90 .32 9 1173 29 7 .000 0.000 505.145 90.189 2074 294 .000 0.000 506.214 91.952 2075 297 .000 0.000 505 .079 90 .161 2076 300 .000 0.000 500 .862 87 .033 2081 301.500 0 .000 494 .503 83.628 2082 305 .650 0 .000 486.071 78.176 2083 303.600 0.000 491.925 81.601 2085 297.250 0.000 505.096 90 .060 2086 300.500 0.000 495.869 84.653 2087 h ydrant 303 .575 1541.500 483 .858 78.117 2088 301.800 0 .000 497.084 84.617 2089 298 .500 0.000 504.707 89.350 EXHIBIT 2 Results -Pipes Number of Pipes: 13(Selection) Pipe ID Node 1 Node2 Diameter Length Roughness Flow Velocity Head loss [in] [ft] [millift] [gpm] [ft/s] [ft] 2204 167 2085 8.000 132.992 130.000 734.452 4 .688 1.372 2453 2074 2075 8.000 235.053 140.000 525.013 3.351 1.135 2454 2075 1173 8 .000 134 .998 140.000 -151.792 -0.969 0.065 2455 2075 2089 8 .000 48.195 140.000 676.805 4.320 0.372 2461 2081 2087 6.000 215.500 140.000 864 .695 9 .812 10 .645 2463 2082 2083 6.000 186.570 140.000 -676.805 -7.680 5.854 2465 2085 1173 8.000 117.494 130.000 -130.243 -0.831 0.049 2466 2086 2081 6.000 27 .651 140 .000 864.695 9.812 1.366 2467 2085 2086 6 .000 186 .803 140 .000 864.695 9.812 9.227 2468 2083 2088 6 .000 164.418 140.000 -676.805 -7.680 5.159 2469 2087 2082 6.000 70.511 140.000 -676.805 -7.680 2.213 2470 2088 2076 6.000 120.379 140.000 -676.805 -7 .680 3.777 2471 2089 2076 6.000 122.550 140.000 676.805 7 .680 3.845 EXHIBIT 2 0P ()5 --I q --5 5 -;w-ifJ ~'.:},D Bridgette George City of College Stat ion Development Services PO Box 9960 College Station, TX 77840 MITCHELL M M MORGAN Re : Autumn Chase Subdivision Pr elim in ary and Fin al Plat s Submittal Dear Bridgette, Attached are the following items for t he Autumn C hase Subdivision Replat. • One copy of the Fire Flow An alys is • One copy of the Engineer 's Estim ate • One copy of the Drainag e Re p o rt e let us know if you have any qu es t ion s. Si 1 erely, ;c.Jofy~ :ero~~~org~ 1, PE CFM Managing Partner Cc. File Dan Bensimon Attachments s~ May 16, 2005 511 UNI VERSITY DRI VE EAST, SUITE 204 • COLLEGE STATION , TX 77840 • T 979 .260.6963 • F 979.260.3564 CIVIL ENG IN EERING • HYDRAULICS • HYDROLOGY • UTILITIES • STREETS • SITE PLANS • SUBDIVISIONS info@m1tchellandmorgan.com • www.m1tchellandmorgan.com CrTY OF COLLEGE STATION Planning & Development Services FOR OF~SE,Q~ P&Z CASE NO .: 0-::::> ---DATE SUBMITTED: ~ -}{p-fX:::> FINAL PLAT APPLICATION (Check one) D Minor ($300 .00) D Amending ($300 .00) D Final ($400.00) D Vacating ($400 .00) ~ Replat ($600.00)* *Includes public hearing fee The following items must be submitted by an established filing deadline date for P&Z Commission consideration. MINIMUM SUBMITTAL REQUIREMENTS: N/A Filing Fee (see above) NOTE: Multiple Sheets -$55 .00 per additional sheet NIA Variance Request to Subdivision Regulations -$100 (if applicable) t' L Development Permit Application Fee of $200 .00 (if applicable). N/A Infrastructure Inspection Fee of $600.00 (applicable if any public infrastructure is being constructed) L Application completed in full. N/A Copy of original deed restrictions/covenants for replats (if applicable). _..J_ Thirteen (13) folded copies of plat. (A signed mylar original must be submitted after staff review.) N/A One (1) copy of the approved Preliminary Plat and/or one (1) Master Plan (if applicable). L Paid tax certificates from City of College Station , Brazos County and College Station l.S .D . ..J A copy of the attached checklist with all items checked off or a brief explanation as to why they are not. _..J_ Two (2) copies of public infrastructure plans associated with this plat (if applicable). _..J_ Parkland Dedication requirement approved by the Parks & Recreation Board, please provide proof of approval (if applicable). Date of Preapplication Conference: _______________________ _ NAME OF SUBDIVISION Autumn Chase Subd ivision SPECIFIED LOCATION OF PROPOSED SUBDIVISION (Lot & Block) Lots 1-13. Block 3 and Lots 1-6, Block 4 APPLICANT/PROJECT MANAGER'S INFORMATION (Primary Contact for the Project): Name Veronica Morgan . PE Street Address 511 Un iv ersity Drive East, Su ite 204 State TX Zip Code .:....77.:....:8"-'4=0 ___ _ Phone Number -'9"-'7--=9-=-2=6=0__,-6=9=6=-3 ______ _ PROPERTY OWNER'S INFORMATION : Name Dan Bensimon Street Address 5810 Tom Wooten Drive State TX Zip Code -'--78::....:7-=3'-'-1 ___ _ Phone Number ~5~1~2~-3~3~8~-1~2~2~5 ______ _ ARCHITECT OR ENGINEER'S INFORMATION : Name Veronica Morgan , PE Street Address 511 University Drive East, Suite 204 State TX Zip Code .:....77.:....:8"-'4=0 ___ _ Phone Number ~9~7~9-=-2::..::6'"""'0__,-6~9=6=-3 ______ _ 6/13/03 City College Station E-Mail Address v@mitchellandmorgan .com Fax Number 979-260-3564 City Austin E-Mail Address dbensimon@swbell.net Fax Number 512-795-8431 City College Station E-Ma il Address v@mitchellandmorgan .com Fax Number 979-260-3564 I of 5 Is there a temporary blanket easement on this property? If so , please provide the Volume N/A and Page# N/A . J l1l . Acreage -Total Property 5.64 ac Total# Of Lots 19 R-0-W Acreage. b Bf' Q,/;,.. Existing Use :V ~=a=ca=n=t __________ _ Proposed Use :Duplexes/Fourplexes ________ _ Number Of Lots By Zoning District ..:..;19,,____ I R-4 Average Acreage Of Each Residential Lot By Zoning District: .21 I ~R_-4 ___ _ Floodplain Acreage Q A statement addressing any differences between the Final Plat and approved Master Plan and/or Preliminary Plat (if applicable): N/A Requested Variances To Subdivision Regulations & Reason For Same : N/A Requested Oversize Participation : N/A Total Linear Footage of Proposed Public: 1182 Streets - Parkland Dedication due prior to filing the Final Plat: ACREAGE : NIA 913_ Sidewalks N/A N/A # of acres to be dedicated + $ ____ development fee 807 -Sanitary Sewer Lines # of acres in floodplain 885 Water Lines NIA #of acres in detention - 0 Channels N/A #of acres in greenways 337 Storm Sewers OR - 0 Bike Lanes I Paths FEE IN LIEU OF LAND: N/A #of Single-Family Dwelling Units X $556 = $ ___ _ _______ (date) Approved by Parks & Recreation Board NOTE: DIGITAL COPY OF PLAT MUST BE SUBMITTED PRIOR TO FILING. The applicant has prepared this application and certifies that the facts stated herein and exhibits attached hereto are true, correct, and complete. The undersigned hereby requests approval by the City of College Station of the above-identified finf lat and attests that this request does not amend any covenants or restrictions associated with this plat ' . Date 2 of5 6/13/03 SUPPLEMENTAL DEVELOPMENT PERMIT INFORMATION Application is hereby made for the follow ing development spec ific site/waterway alterations: None ACKNOWLEDGMENTS: I, Veronica Morgan , desig n engineer/owner, hereby acknowledge or affirm that: The information and conclusions conta ined in the above plans and supporting documents comply with the current r irements of the City of Col lege Stat ion , Texas City Code , Chapter 13 and its associated Drainage Policy and Design Sa dards . As a condition of approval of this permit applicat ion , I agree to construct the improvements proposed in this a I cation~cc ing t these documents and the re quirements of Chapter 13 of the College Station City Code . ~~~~~~~~~~~~~~~~~ Contractor CERTIFICATIONS: (for proposed alterations within designated flood hazard areas .) A.I, NIA certify that any nonresidential structure on or proposed to be on this site as part of this application is designated to prev ent damage to the structure or its contents as a result of flooding from the 100 year storm . Engineer Date 8 . I, N/A certi fy that the finished floor elevation of the lowest floor , including any basement, of any residential structure , proposed as part of this application is at or above the base flood elevation established in the latest Federal Insurance Ad m inistration Flood Hazard Study and maps , as amended . Engineer Date C. I, N/A , certify that the alterations or development covered by this permit shall not diminish the flood-carrying capacity of the wate rway adjo ini ng or crossing this permitted site and that such alterations or development are consistent with requirements of the City of College Station City Code, Chapter 13 concerning encroachments of floodways and of floodway fr in ges . Engineer Date D. I, N/A , do certify that the proposed alterations do not raise the level of the 100 year flood above elevation established in the latest Federal Insurance Administration Flood Hazard Study . Engineer Date Conditions or comments as part of approval : !...:N~/A...!,_ ________________________ _ In accordance with Chapter 13 of the Code of O rd inances of the City of College Station , measures shall be taken to insure that debris from construction , erosion , and sedimentation shall not be depos ited in city streets , or existing drainage facilities . All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer for the above named project. All of the applicable codes and ordinances of the City of College Station shall app~. . - 6/13 /03 3 of 5 SUBMIT APPLICATION AND THIS LIST CHECKED OFF W ITH 13 FOLDED COPIES OF PLAT FOR REVIEW C ITY O F COLLEGE S TATION Planning & D evel.opmmt Services FINAL PLAT MINIMUM REQUIREMENTS (ALL CITY ORDINANCES MUST BE MET) INCLUDING BUT NOT LIMITED TO THE FOLLOWING: (Requirements based on field survey and marked by monuments and markers.) 1. Drawn on 24" x 36 " sheet to scale of 100 ' pe r inch or larger. 2 . Vicinity map which includes enough of surrounding area to show general location of subject property in relat ionship to College Station and its City Limits . No scale required but include north arrow. ~ 3 . Title Block with the follow ing informat ion : G( Name and add ress of subdivider, recorded owner, planner, engineer and surveyor. Gt' Proposed name of subdivision . (Subd ivision name & street names will be approved through Brazos County 911 .) (Replats need to retain original subdivision name.) Date of preparat ion . Engineer's scale in feet. Total area intended to be developed . Gf 4. North Arrow. 0 5 . fSll~ 6 . Subdivision boundary i nd icated by heavy lines . If more than 1 sheet , an inde x sheet showi ng entire subdivision at a scale of 500 feet per inch or larger. G( 6/13/03 7 . 8. 9 . All applicable certifica ti ons based on the type of final plat. g Ownership and Dedi cation ~ Surveyor and/o r E ng ineer CJ" City Engineer (a nd C ity Planne r , if a minor plat) ~ D Plann ing and Zon ing Commission (delete if m inor plat) Brazos County C lerk Brazos County Co m miss ioners Cou rt Approval (ET J Plats only) Paid tax certificates . If submitting a replat w here there are existing improvements , submit a survey of the subject property showing th e imp rovements to ensure that no encroachments will be created . 10 . If using private septi c sys tems , add a general note on the plat that no private sewage facility may be installed on any lo t i n this subdiv is ion without the issuance of a license by the Brazos County Health Unit under the p rov is ions of the pri vate faci lity regulations adopted by the Commissioner's Court of Brazos Cou nty , pursuant to the provisions of Section 21 .004 of the Texas Water Code . 11 . Location of the 100 Y ear Floodpla in and floodway , if applicable , according to the most recent available data . 12 . Lot corner markers a nd s u rvey monuments (by symbol) and clearly tied to basic survey data . 13. Matches the approv ed p re liminary pl at and/or master development plan . 4 ofS 14. The location and description with accurate dimensions, bearings or deflection angles and radii, area, center angle , degree of curvature , tangent distance and length of all curves for all of the following: (Show existing items that are intersecting or contiguous with the boundary of or forming a boundary with the subdivision, as well as , those within the subdivision). Existing Proposed D ~ Streets . Continuous or end in a cul -de-sac, stubbed out streets must end into a temp turn around unless they are shorter than 100 feet. ~ ri i 0 rs1' Public and private R.O .W . locations and widths. (All existing and proposed R.0.W.'s _/ sufficient to meet Thoroughfare Plan .) D hl \bf Street offsets and/or intersection angles meet ordinance . D O~\f' Alleys. @ ~ Easements . Q ~ A number or letter to identify each lot or site and each block . Q--Et~\t< Greenbelt area/park linkages/parkland dedication ( All proposed dedications must be reviewed by the Parks and Recreation Board prior to P & Z Commission consideration.) 15. Construction documents for all public infrastructure drawn on 24" x 36" sheets and properly sealed by a Licensed Texas Professional En gi neer that include the following: 16 . 17. 18. 0 Street, alley and sidewalk plans , profiles and sections. One sheet must show the overall street, alley and/or sidewalk layout of the subdivision . (may be combined with other utilities). Sanitary sewer plan and profile show ing depth and grades . One sheet must show the overall sewer layout of the subdivision . (Utilities of sufficient size/depth to meet the utility master plan and any future growth areas .) Water line plan showing fire hydrants , valves , etc. with plan and profile lines showing depth and grades . One sheet must show the overall water layout of the subdivision . (Utilities of sufficient size/depth to meet the utility master plan and any future growth areas.) Storm drainage system plan with contours , street profile, inlets, storm sewer and drainage channels , with profiles and sections. Drainage and runoff areas, and runoff based on 5 , 1 O, 25 , 50 and 100 year rain intensity. Detailed drainage structure design, channel lining design & detention if used . One sheet must show the overall drainage layout of the subdivision. Detailed cost estimates for all public infrastructure listed above sealed by Texas P.E. Drainage Report . Erosion Control Plan (must be included in construction plans). All off-site easements necessary for infrastructure construction must be shown on the final plat with a volume and page listed to indicate where the separate instrument easements were filed . Separate instrument easements must be filed prior or concurrently with Final Plat. Are there impact fees associated with this development? 0 Yes D No Impact fees for R-1 , R-2, & R-3 zoned final plats , must be paid prior to filing. Will any construction occur in TexDOT rights-of-way? 0 Yes 0 No If yes , TexDOT perm it must be submitted along with the construction documents. NOTE: 1 . We will be requesting the corrected Final Plat to be submitted in digital form if available prior to filing the plat at the Courthouse . 6/13/03 2. If the construction area is greater than 5 acres , EPA Notice of Intent (NOi) must be submitted prior to issuance of a development permit. 5 of5 Alan Gibbs, P.E. Assistant City Engineer for Development Development Services P.O . Box 9960 College Station, TX 77840 MITCHELL MM MORGAN Re: Autumn Chase Villas Drainage Addendum Dear Alan, ~o-r;-14 es&~-s '5-;)J)-v :5" J :;LO ~ May 16, 2005 The inte nt of this letter is to detail changes to the proposed drainage infrastructure de scribed in the Autumn Chase Villas Drainage Analysis , submitted by Mitchell & Morgan, LLP to the City of College Station in December 2004 . While none of the Cornell Street infrastructure will be modified, the proposed layout for the Autumn Chase Villas ha s changed since the last report was submitted, resulting in the need for updated drainage design. The new layout includes the subdividing of Lot 6, Block 2 into several smaller lots. This site design also includes the construction of Autumn Chase Loop, which will serve as the access route to all the lots in this portion of the Autumn Chase Subdivision . The new layout can be seen in ExhibitC of the attached sheets . The proposed drainage system will continue to discharge into the existing detention pond located at the east corner of the property, adjacent to Cornell Street. The drainage design was analyzed in XP-S torm 9 .1 .4 just as the December 2004 report was. While the configuration of the Autumn Chase subdivision has changes, the relative amount of impervious cover has not changed significantly. Only a slight variation exists in the postdevelopment flow into the pond between the old and new design, leaving the conditions in the pond and downstream of the Autumn Chase subdivision largely the same, with a slight increase upward for the new layout. The new drainage infrastructure consists of approximately 50 LF of 30" RCP and 308 LF of 18" RCP as detailed in Exhibit C of this addendum. Modeling of the sys tem indicates that these pipes provide adequate conveyance into the detention pond . In addition, the capacity of the proposed 4" rollover curb was analyzed to determine street capacity. This was done using Manning's equation as opposed to the gutter equations in the College Station Drainage Policy and Design Standards (DPDS) because these equations are based on a 6" curb and Manning's was more conservative . These calculations have been prov ided as Exhibit D. The plan and profile sheet provided as Exhib it C indicates a small stub out located along on of the interior property lines . This stub out will serve the future development of the property by providing access to the drainage system. The property was analyzed at estimated full development levels and as such, some drainage assumptions were made to account for all of the flow into the detention pond . An updated drainage area map has been provided as Exhibit B of the report. The current site configuration has only two inlets on it; one 5 ' recessed inlet at the southwest corner of the property and on 1 O' recessed 511 UNIVERSITY DRIVE EAST, SUITE 204 • COLLEGE STATION, TX 77840 • T 979.260.6963 • F 979.260.3564 CIVIL ENGINEERING • HYDRAULICS • HYDROLOGY • UTILITIES • STREETS • SITE PLANS • SUBDIVISIONS info@mitchellandmorgan .com • www.mitchellandmorgan.com inlet at the southeast corner of the property, adjacent to the detention pond . Flow from the north end of the property will be conveyed in the streets and within the Right-of-Way for the 100-year event. The project will continue to meet the drainage object ives of the College Station DPDS . If you have any questions or comments, please feel free to contact either Veronica Morgan or myself at 260-6963. Sincere ly , ~~ Terry M . Barr, E.l.T, C.F.M Graduate Eng ineer Cc: File Dan Bensimon, Owner -0 ~ c 0 ~ -=; a. E wo T""" () ,.... en co -..._ ,..._ Q) C') Q) ()) -~ . 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If. 0~ F· og 13 • .S7 115 ~ "1 ((~ t Item No. Quantity Units 1 1 LS 2 4 EA 3 1500 LF 4 4 EA 5 3000 CY 6 2293 LF 7 3033 SF 8 3033 SY 9 4040 SY 10 4875 SF 11 808 LF 12 4 EA 13 6 EA 14 3 EA 15 8 EA 16 2 EA 17 150 LF 18 1074 LF 19 372 LF 20 1 EA 21 2 EA 22 9 EA 23 7 EA 24 7 EA 25 2 EA 26 1 EA 27 3 EA 28 4 EA 29 3 EA 30 1 EA 31 3 EA 32 2 EA 33 6 EA 34 2 EA 35 50 LF 36 54 LF 37 1 EA ENGINEERS ESTIMATE FOR AUTUMN CHASE SUBDIVISION Description & Unit Price in Words GENERAUELECTRICAL ITEMS Mobilization & Traffic Control Street Liqhtinq Electrical Conduit Transformer Pads ROADWAY ITEMS Earthwork , Including Import and Export Type Ill Curb 2" HMAC 6" Crushed Limestone Base Lime Stabilized Subbase Concrete Sidewalk & Ramps SANITARY SEWER ITEMS 6" Sanitary Sewer Sewer Manhole 6" Sanitary Sewer Service(< 25') 6" San itary Sewer Service (> 25') 4" Sanitary Sewer Service(< 25') 4" Sanitary Sewer Service (> 25') Remove Ex . Sewer System WATER LINE ITEMS 6" PVC Water Line with Structural backfill (AWWA C909) 3" PVC Water Line with structural backfill (AWWA 02241) Fire Hydrant Connect to Ex . 6" & 8" Water Line 6" M .J. Gate Valve & Box 3" M .J . Gate Valve & Box 6" x 3" M .J . Tee 6" x 1.5" M.J. Tee 6" x 90 M .J. Bend 6" x 45 M.J . Bend 6" x 22.5 M .J. Bend 6" x 11 .25 M .J. Bend 3" x 11.25 M .J. Bend 3" x 22.5 M .J . Bend 3" x 45 M .J . Bend 1 .5" Water Service (< 25') 1.5" Water Service (> 25') 6" PVC Casing (AWWA C905) 14" Steel Casing 2" Blow off Assembly Unit Price Total Price $10,000 .00 $10 ,000 $3,500.00 $14 ,000 $4.50 $6,750 $400 .00 $1 ,600 $8 .00 $24 ,000 $9.00 $20,637 $6 .00 $18,198 $10 .00 $30,330 $2 .00 $8,080 $3 .00 $14,625 $35 .00 $28 ,280 $2 ,300 .00 $9,200 $1 ,200 .00 $7,200 $1 ,800.00 $5,400 $900 .00 $7,200 $1,200 .00 $2,400 $5 .00 $750 $40 .00 $42,960 $35 .00 $13,020 $2 ,000.00 $2,000 $500 .00 $1 ,000 $500.00 $4 ,500 $400.00 $2 ,800 $200.00 $1,400 $200.00 $400 $200 .00 $200 $200.00 $600 $200.00 $800 $200.00 $600 $150.00 $150 $150.00 $450 $150 .00 $300 $800 .00 $4 ,800 $900.00 $1 ,800 $20 .00 $1,000 $40 .00 $2,160 $500 .00 $500 Page 1 of2 f Item No. Quantity Units 38 1 LF 39 1 LF 40 322 LF 41 28 LF 42 1 EA 43 1 LF 44 50 SF 45 2 EA 46 1 EA 47 1000 SY 48 10000 SY 49 1 LS ENGINEERS ESTIMATE FOR AUTUMN CHASE SUBDIVISION Description & Unit Price in Words STORM DRAIN ITEMS 5' Recessed Storm Drain Inlet 1 O' Recessed Storm Drain Inlet 18" Cl Ill RCP Storm Drain 30" Cl Ill RCP Storm Drain 30" x 30 Degree RCP Bend 30" Sloped Headwall Remove Ex . Cone Flume 30" Junction Box 54" Special Junction Box POLLUTION PREVENTION ITEMS Sod in developed areas Hydro Seeding in undeveloped areas Storm Water Pollution Prevention Implementation Base Bid Subtotals: GENERAUELECTRICAL ITEMS ROADWAY ITEMS SANITARY SEWER ITEMS WATER LINE ITEMS STORM DRAIN ITEMS POLLUTION PREVENTION ITEMS Grand Total Unit Price Total Price $2 ,000 .00 $2 ,000 $2 ,500 .00 $2 ,500 $40 .00 $12 ,880 $70 .00 $1 ,960 $560.00 $560 $1,400 .00 $1,400 $4 .00 $200 $1 ,500 .00 $3 ,000 $3 ,000 .00 $3 ,000 $8 .00 $8 ,000 $2.00 $20,000 $4 ,000 .00 $4 ,000 $ 32 ,350 .00 $ 115,870 .00 $ 60,430 .00 $ 80 ,940 .00 $ 27 ,500 .00 $ 32 ,000.00 $ 349 ,090 .00 Page 2 of 2 Bridgette George City of College Station Planning & Development Services P .O . Box 9960 College Station, TX 77842 MITCHELL MM MORGAN Re: Autumn Chase (FP) Staff Review Comments Dear Bridgette, Please find attached with this letter two (2) sets of revised drawings, and the answers to the Staff Review Comments . Comment : Answer : Gate valves are required; one less than every leg of a tee connection . Acknowledged , changes have been made on drawings . If you have any questions or comments please feel free to contact us at 260-6963 . Thank you . Sincerely, ~~ Paigei rrett Administrative Assistant Cc : File Dan Bensimon 511 UNIVERSITY DRIVE EAST, SUITE 204 • COLLEGE STATION, TX 77840 • T 979.260.6963 • F 979.260.3564 CIVIL ENGINEERING • HYDRAULICS • HYDROLOGY • UTILITIES • STREETS • SITE PLANS • SUBDIVISIONS 1nfo@mitchellandmorgan .com • wwwmitchellan dmo rgan .com