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Home My WebLink AboutWater DesignCar+s+a/r+rarJ April 20, 2011 David Loflin Texas Commission of Environmental Quality Water Supply Division MC 153 P.O. Box 13087 Austin, TX 78711 7607 Eastmark Drive, Ste. 250-F <77840> P.O. Box 9253, College Station, TX 77842 Off/Fax: (979) 764-0704 email: civil@rmengineer.com RE: The Townhomes on Marion Pugh TCEQ Exception Letter for Utility Improvements 101 Luther Street, College Station, TX Lot 1, Block One — Callaway Subdivision, Ph 3, Brazos County RME No. 178-0418 Mr. David Loflin: The above referenced project will install the following improvements within the distribution system of the City of College Station: O• Approximately 4,595 linear feet of 6", 8", and 12" PVC (C-909, Class 200) water line; •S Applicable fire hydrants, services, valves & fittings. Design and construction of these improvements will be in accordance with the latest Bryan/College Station Unified Water & Sewer Design Guideline Manual, Standard Details, and Specifications and Chapter 290 of the TCEQ Rules & Regulations. This quantity of water line is less than 10% of the total length of water line within the City's current distribution system. Therefore, an exception for plan review is being requested for this project and its water system improvements. Please call Sincerely, Rabon A.N Texas Firm rabon@rmengineer.com xc: Josh Norton, P.E. Assistant City Engineer City of College Station 1101 Texas Avenue South College Station, TX 77840 C131-178-0418-1,05 or require assistance. Page l of 1 PUBLIC WATER SYSTEM PLAN REVIEW SUBMITTAL FORM (Complete and Attach to Submittal Package) Date: April 20, 2011 TCEQ PWS Identification No.*: 0210002 CCN No. or Application No.**:10169 Water System Name: City of College Station Water System Owner: City of College Station Type of Entity: Municipality Address: 101 Luther Street — College Station Phone: (979) 764-3660 ResDo County (system location) : Brazos County Subdivision Sec., Phase, Unit, e Subdivision Ph 3 Mechanism & Source of Engineer: Rabon A. Metcalf, P.E. Registration Number: 88583 Firm Name: RME Consulting Engineers Phone: 91 79) 71 Firm Address: P.O. Box 9253. College Station, TX 77842 Fax: 19791 764- ' If no PWS Number exists, the owner must submit a business plan, if required, in accordance with §290.39(f) and (g). If a required CCN number does not exist, an acceptable application to obtain a CCN number must be made before a project submittal can be technically reviewed. In addition, if a submittal is for a project located outside the CCN area, a CCN amendment application must be submitted before a project may be reviewed for construction approval. Please refer to 30 TAC Chapter 291 for additional information regarding CCNs. If this is a new (proposed) system, you must attach the following with this submittal: NOT APPLICABLE ❑ Attach a list of all water utilities within % mile of the proposed service area boundaries ❑ Copies of formal applications for service from each of the following ❑ any municipality if the system is within its ETJ; ❑ any district or other political subdivision whose corporate boundaries are within '% mile of the proposed service area boundaries ❑ any other water service provider whose certificated service area boundary is within '/z mile of the proposed service area boundaries ❑ Documentation that all application requirements including payment of fees were complied with. ❑ Copies of written responses from each of the entities listed above. ❑ Business plan, if required by 30 TAC 290.39(f) & (g). The business plan financial requirements for non -community water systems must confirm capital availability to construct the system according to TCEQ requirements. This would consist of a balance sheet that shows liabilities as well as assets, not just a bank confirmation of a deposit account. Alternatively, if the project is being constructed with loan funds, then a loan commitment letter from the lender specific to that project will suffice. ❑ Justification for constructing a separate system (unless none of the entities listed above exist) ❑ Plans and specifications with an engineering report all sealed by design engineer. Type of Project (please check the appropriate boxes) ✓ Distribution System Modifications ❑ Storage Capacity Modifications ❑ Well completion data on previously approved well ❑ Water Well Construction, Proposed ❑ Pressure Maintenance Facilities Modifications ❑ Proposed Innovative Process Study ❑ Disinfection Facilities or Other Modifications ❑ Ground Water Treatment Plant, New ❑ Preliminary Engineering Report wto plans ❑ Surface Water Treatment Plant, New ❑ Modification of Surface Water Treatment Plant ❑ Tex. Water Dev. Board Proj. No. IF THIS SUBMITTAL IS A REVISION OF PREVIOUSLY SUBMITTED PLANS, PLEASE ENTER THE ASSIGNED TCEQ LOG NUMBER: . Please call (512) 239-6960 if you have questions regarding this form. Your cooperation will help us provide better service. Additional helpful information and rules are available at our website: http://www, tceq. state. Ix. us/permitting/waterperm/ud/pl anrev. html I hereby certify that the above information is, to the best of my knowledge, true and correct. S� E �F?.ekq It Rabon A. Metcalf, P.E. April 20, 2011 i ^ n . . Printed Engineer's Name Date 885K s••E.Ns,�� I Revised 9/12/02 ttt\\O A` C:\USERS\RABON\RME\PROJECTS\178-0418 ACC-CALLAWAY VILLAS 2\ENGINEERING\TCEQ FORM 10233-WATER 1 Irs ' Cn,nsea/rrrag r�..s,�.o,d,.c April 20, 2011 Louis Heron III, P.E. Texas Commission of Environmental Quality Plans & Specification Review MC 148 P.O. Box 13087 Austin, TX 78711-3087 7607 Eastmark Drive, Ste. 250-F <77840> P.O. Box 9253, College Station, TX 77842 Off/Fax: (979) 764-0704 email: civil@rmengineer.com RE: Chapter 217 Summary Transmittal Letter Permittee: City of College Station Permit Number: Lick Creek WWTP: WQ0010024-006 Project Name: The Townhomes on Marion Pugh — College Station, TX County: Brazos County Grant No.: N/A Mr. Louis Heron: The purpose of this letter is to provide the TCEQ with the information necessary to comply with the requirements of Chapter 217.8(c) of the TCEQ's rules entitled, Design Criteria for Sewerage Systems. The necessary information includes: 1. Engineering Firm: RME Consulting Engineers 7607 Eastmark Drive, Suite 250F <77840> P.O. Box 9253 College Station, TX 77842 2. Design Engineer: Rabon A. Metcalf, P.E. Off/Fax: (979) 764-0704 3. Location: Brazos County, TX 4. Project Identifier: The Townhomes on Marion Pugh — Site Paving, Drainage & Utility Improvements 5. Operator: City of College Station 6. Collection System: City of College Station — Public Utilities Department C131-178-0418-1,06 Page 1 of 2 �A cartwfYe"r� r�o+.r.a.� 7607 Eastmark Drive, Ste. 250-F <77840> P.O. Box 9253, College Station, TX 77842 Off/Fax: (979) 764-0704 email: civil@rmengineer.com 7. Plan & Specification Compliance: Design and construction of these improvements are in accordance with the Bryan/College Station Unified Water & Sewer Specifications, Design Guidelines Manual, and Chapter 217 of the TCEQ Rules & Regulations. This sanitary sewer improvement project will be constructed with the City of College Station performing a technical review. The plans and specifications which describe the project identified in this letter are in substantial compliance with all the requirements of Chapter 217. 8. Variances: Not Applicable; 9. Project Scope: The above referenced project will install the following sanitary sewer improvements within the CCN of the City of College Station (CoCS): •8 Approximately 563 linear feet of gravity sewer: 0 8" PVC (SDR 26, D3034); d• Applicable manholes, cleanouts, and service leads; If you have any questions regarding this project, please contact Mr. Rabon A. Metcalf, P.E. (Off/Fax: 979.764.0704 or rabon@rmengineer.com). Sincerely, Rabon A. Metcalf, I Texas Firm Registrati rabon@rmengineencum xc: Josh Norton, P.E. Assistant City Engineer City of College Station 1101 Texas Avenue South College Station, TX 77840 CD1-178-0418-L06 Page 2 of SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 2 - Project Administration Start (Page 2.1) Engineering and Design Professionals Information Engineering Firm Name and Address: Jurisdiction F-wl City: Bryan College Station Come r= rrs%f ritow I -Tx -77eq 2 Date of Submittal: I 2 23/ U Lead Engineer's Na"me and Contact Info.(phone, e-mail, fax): Other: �Gt-zN �- VAF-r CA L,lre.E. Supporting Engineering / Consulting Firm(s): Other contacts: Developer / Owner / Applicant Information Developer / Applicant Name and Address: Phone and e-mail: AmeP e4&4t4 CA+nw.>s (SDM AQN)71 F b C512� Z — l o 00 t 70o hF%" 600QWT1e.-( RX-VD . )�fl: -r x. 7e -7.3 Property Owner(s) if not Developer / Applicant (& address): Phone and e-mail: Project Identification Development Name: uT(FF12 STeF�jfu{�r�S7 HO�IaJC� Is subject property a site project, a single-phase subdivision, or part of a multi -phase subdivision? 6� f14 byLF_ If multi -phase, subject property is phase of Legal description of subject property (phase) or Project Area: (see Section II, Paragraph B-3a) )_(D--t I I &CoC_\g:_ ONE CAI.LAvJI�`I SvSgf�1VIS1orS� fir+ � If subject property (phase) is second or later phase of a project, describe general status of all earlier phases. For most recent earlier phase Include submittal and review dates. General Location of Project Area, or subject property (phase): F�A=sr FI aLVV_. �F t,aree� W� -4-F�oL�r eel q- z tic�F� In City Limits? Jurisdiction (acreage): Bryan: acres. [Extraterritorial ryan: College Station: CollegeStation: 1a•tO73 acres. creage Outside ETJ: STORMWATER DESIGN GUIDELINES Page 3 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 j1-3� q'S0 3.3 It APPENDIX D — TECHNICAL DESIGN SUMMARY Part 2 — Project Administration Continued (page 2.2) Project Identification (continued) Roadways abutting or within Project Area or Abutting tracts, platted land, or built subject property: I�vzr-+��. R-�P*P developments: �fl2rrmrs�ns mn�t�t r`tic�l+ P�. Gfl�-�-r�ir-+�t�t,A \A[, Named Regulatory Watercourse(s) & Watershed(s): Tributary Basin(s): —fvLtr O-ra,2-H 6 ge�F C-,P-t✓Sxc, Plat Information For Project or Subject Property (or Phase) Preliminary Plat File #: Final Plal File #: Date: Name: Status and Vol/Pg: I Ow-1 / i If two plats, second name: File #: Status: Date: Zoning Information For Projector Subject Property (or Phase) Zoning Type: lz"t-1 Existing or Proposed? Case Code: Case Date Status: Zoning Type: Existing or Proposed? Case Code: Case Date Status: Stormwater Management Planning For Project or Subject Property (or Phase) Planning Conference(s) & Date(s): Participants: Preliminary Report Required? Submittal Date Review Date Review Comments Addressed? Yes _ No _ In Writing? When? Compliance With Preliminary Drainage Report. Briefly describe (or attach documentation explaining) any deviation(s) from provisions of Preliminary Drainage Report, if any. STORMWATER DESIGN GUIDELINES Page 4 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 2 — Project Administration Continued (page 2.3) Coordination For project or Subject Property (or Phase) Note: For any Coordination of stormwater matters indicated below, attach documentation describing and substantiating any agreements, understandings, contracts, or approvals. Coordination Dept. Contact: Date: Subject: With Other Departments of Jurisdiction City (Bryan or College Station) Coordination With Summarize need(s) & actions taken (include contacts & dates): Non -jurisdiction City Needed? Yes_No_ Coordination with Summarize need(s) & actions taken (include contacts & dates): Brazos County Needed? Yes _ No _ Coordination with Summarize need(s) & actions taken (include contacts & dates): TxDOT Needed? d Yes No Coordination with Summarize need(s) & actions taken (include contacts & dates): TAMUS Needed? I/ Yes No Permits For Project or Subject Property (or Phase) As to stormwater management, are permits required for the proposed work from any of the entities listed below? If so, summarize status of efforts toward that objective ins aces below. Entity Permitted or Approved ? Status of Actions include dates ( ) US Army Crops of Engineers t/ No Yes _ US Environmental Protection Agency No Yes _ Texas Commission on Environmental Quality No Yes �JtlJP3taPL ��rv111 Brazos River Authority Z No Yes STORMWATER DESIGN GUIDELINES Page 5 of 26 APPENDIX. D: TECH. DESIGN SUMMAR' Effective February 2007 As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Part 3 — Property Characteristics Start (Page 3.1) Nature and Scope of Proposed Work Existing: Land proposed for development currently used, including extent of impervious cover? �R�Pns� � linPQ>✓�JYt,oP� (Nri N 3o+�f= !-C��% Cf�!'Q,2�Ca� Redevelopment of one platted lot, or two or more adjoining platted lots. Site Development Building on a single platted lot of undeveloped land. Project Building on two or more platted adjoining lots of undeveloped land. (select all Building on a single lot, or adjoining lots, where proposed plat will not form applicable) a new street (but may include ROW dedication to existing streets). Other (explain): Subdivision Construction of streets and utilities to serve one or more platted lots. Development Construction of streets and utilities to (serve one or more proposed lots on Project lands represented by pending plats. Site proiects: building use(s), approximate floor space, impervious cover ratio. Subdivisions: number of lots by general type of use, linear feet of streets and Describe drainage easements or ROW. Nature and Size of 6at,go 2>-ro APPr2.-frAE4sl L-.,i- iA- Proposed r`mFNI i Ct��yt�L �j �s�PutZ tr—nsANCFS Project Is any work planned on land that is not platted If yes, explain: or on land for which platting is not pending? 7= ✓ No Yes FEMA Floodplains 11 Is any part of subject property abutting a Named Regulatory Watercourse No v1 Yes (Section 11, Paragraph 131) or a tributary thereof? Is any part of subject property in floodplain No Yes Rate Map 18Z C- area of a FEMA-regulated watercourse? __ Encroachments) into Floodplain Encroachment purpose(s): Building site(s) _ Road crossing(s) areas planned? Utility crossing(s) Other (explain): No 7 Yes If floodplain areas not shown on Rate Maps, has work been done toward amending the FEMA- approved Flood Study to define allowable encroachments in proposed areas? Explain. STORMWATER DESIGN GUIDELINES Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D TECHNICAL DESIGN SUMMARY Part 3 — Property Characteristics Continued (Page 3.2) Hydrologic Attributes of Subject Property (or Phase) Has an earlier hydrologic analysis been done for larger area including subject property? Reference the study (& date) here, and attach copy if not already in City files. Yes Is the stormwater management plan for the property in substantial conformance, with the earlier study? Yes No If not, explain how it differs. If subject property is not part of multi -phase project, describe stormwater management N _ _ °✓✓/ plan for the property in Part 4.' If property is part of multi -phase project, provide overview of stormwater management plan for Project Area here. In Part 4 describe how plan for subject property will comply therewith. IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 3 — Property Characteristics Continued (Page 3.3) Hydrologic Attributes of Subject Property (or Phase) (continued) Does subject property straddle a Watershed or Basin divide? No V11 Yes If yes, describesplits below. In Part 4 describe design concept for handling this. Watershed or Basin Larger acreage Lesser acreage >A "x`' >A "k3\ l•t3 Above -Project Areas(Section II, Paragraph B3-a) Does Project Area (project or phase) receive runoff from upland areas? _ No _ Yes Size(s) of area(s) in acres: 1) 2) 3) 4) Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable concentrated section(s), small creek (non -regulatory), regulatory Watercourse or tributary); Flow determination: Outline hydrologic methods and assumptions: Does storm runoff drain from public easements or ROW onto or across subject property? No Yes If yes, describe facilities in easement or ROW: Are changes in runoff characteristics subject to change in future? Explain Conveyance Pathways (Section II, Paragraph C2) Must runoff from study property drain across lower operties before reaching a Regulatory Watercourse or tributary? No = Yes Describe length and characteristics of each conveyance palhway(s). Include ownership of property(ies). WZ"Gr�tP ursD�2 �� —'r 8'X2•Sr LAX uNo�,/L_ FM 2tsH — rL W l 2 ` ` la-kO'6 oF� STORMWATER DESIGN GUIDELINES Page 8 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D — TECHNICAL DESIGN SUMMA Part 3 — Property Characteristics I Continued (Page 3.4) Hydrologic Attributes of Subject Property (or Phase) (continued) Conveyance Pathways (continued) Do drainage If yes, for what part of length? % Created by? _ plat, or easements instrument. If instrument(s), describe their provisions. exist for any part of pathway(s)? —No Yes Where runoff must cross lower properties, describe characteristics of abutting lower property(ies). (Existing watercourses? Easement or Consent squired?) Pathway Areas Describe any built or improved drainage facilities existing near the property (culverts, bridges, lined channels, buried conduit, swales, detention ponds, etc). Nearby Drainage Facilities Do any of these have hydrotogic or hydraulic influence on proposed stormwater design? —No r Yes If yes, explain: STORMWATER DESIGN GUIDELINES Page 9 of 26 APPENDIX. D: TECH, DESIGN SUMMARY Effective February 2007 As Revised February 2009 IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Start (Page 4.1) Stormwater Management Concept Discharge(s) From Upland Area(s) If runoff is to be received from upland areas, what design drainage features will be used to accommodate it and insure it is not blocked by future development? Describe for each area, flow section, or discharge point. Discharge(s) To Lower Property(ies) (Section II, Paragraph E1) Does project inclyde drainage features (existing or future) proposed to become public via platting? V No Yes Separate Instrument? No Yes Per Guidelines reference above, how will Establishing Easements (Scenario 1) runoff be discharged to neighboring pre -development Release (Scenario 2) property(ies)? _Combination of the two Scenarios Scenario 1: If easements are proposed, describe where needed, and provide status of actions on each. (Attached Exhibit #) Scenario 2: Provide general description of how release(s) will be managed to pre -development conditions (detention, sheet flow, partially concentrated, etc.). (Attached Exhibit #_----) MF-rz- —�'Hv_oQc.o FnYtcwl Act 1Ti Combination: If combination is proposed, explain how discharge will differ from pre - development conditions at the property line for each area (or point) of release. If Scenario 2, or Combination are to be used, has proposed design been coordinated with owner(s) of receiving property(ies)? No Yes Explain and provide documentation. STORMWATER DESIGN GUIDELINES Page 10 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.2) Stormwater Management Concept (continued) Within Project Area Of Multi -Phase Project Identify gaining Basins or Watersheds and acres shifting: Will project result in shifting runoff between Basins or between What design and mitigation is used to compensate for increased runoff Watersheds? from gaining basin or watershed? J' No Yes How will runoff from Project With facility(ies) involving other development projects. Area be mitigated to pre - Establishing features to serve overall Project Area. development conditions? F3::On Select any or all of 1, 2, phase (or site) project basis within Project Area. and/or 3, and explain below. 1. Shared facility (type & location of facility; design drainage area served; relationship to size of Project Area): (Attached Exhibit #_) 2. For Overall Proiect Area (type & location of facilities): (Attached Exhibit #_____j 'Fv"' O I _F- �F�ZA� �a Y� PVJP-- ✓�oPmlz.s-1 �)�,Art�S 3. By phase (or site) project: Describe planned mitigation measures for phases (or sites) in subsequent questions of this Part. Are aquatic echosystems proposed? — No Yes In which phase(s) or project(s)? v > Are other Best Management Practices for reducing stormwater pollutants proposed? a No Yes Summarize type of BMP and extent of use: — u, c I rn N O Z a If design of any runoff -handling facilities deviate from provisions of B-CS Technical V Specifications, check type facility(ies) and explain in later questions. Detention elements Conduit elements — Channel features — Swales Ditches Inlets Valley gutters _ Outfalls Culvertfeatures Bridges Other STORMWATER DESIGN GUIDELINES Page 11 of 26 APPENDIX. D: TECH. DESIGN SUMMAR` Effective February 2007 As Revised February 2009 APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.3) Stormwater Management Concept (continued) Within Project Area Of Multi -Phase Project (continued) Will Project Area include bridge(s) or culvert(s)? No Yes Identify type and general size and In which phase(s). If,dgtentinq/retention serves (will serve) overall Project Area, describe how it relates to subject phase or site project (physical location, conveyance pathway(s), construction sequence): Low F?-� t A T AN f�- Co'SSI sT vF Ans ons�P c��uar> >/1}JLi crJrn+ P tosnt PI nos 4. QAQ\�trlCa S�to2�C�� Within Or Serving Subject Property (Phase, or Site) If property part of larger Project Area, is design in substantial conformance with earlier analysis and report for larger area? Yes No, then summarize the difference(s): '7 Identify whether each of the types of drainage features listed below are included, extent of use, and general characteristics. Typical shape? Surfaces? v N v Steepest side slopes: Usual front slopes: Usual back slopes: v, r at w Flow line slopes: least Typical distance from travelway: w typical greatest (Attached Exhibit#) v O y Z 0 Are longitudinal culvert ends in compliance with B-CS Standard Specifications? Yes No, then explain: At intersections or otherwise, do valley gutters cross arterial or collector streets? No Yes If yes explain: mI Are valley gutters proposed to cross any street away from an intersection? w o 0 No Yes Explain: (number of locations?) N _ _ G�N rp STORMWATER DESIGN GUIDELINES Page 12 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.4) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Gutter line slopes: Least Usual Greatest Are inlets recessed on arterial and collector streets? Yes No If "no", identify where and why. Will inlets capture 10-year design stormflow to prevent flooding of intersections (arterial with arterial or collector)? _ Yes No If no, explain where and why not. v\ Will inlet size and placement prevent exceeding allowable water spread for 10-year design storm throughout site (or phase)? _ Yes — No If no, explain. rn Sag curves: Are inlets placed at low points? Yes _ No Are inlets and c conduit sized to prevent 100-year stormflow from ponding at greater than 24 inches? s 0 Yes No Explain "no" answers. m a� m P Will 100-yr stormflow be contained in combination of ROW and buried conduit on whole length of all streets? Yes _ No If no, describe where and why. Do designs for curb, gutter, and inlets comply with B-CS Technical Specifications? Yes No If not, describe difference(s) and attach justification. Are any 12-inch laterals used? _ No Yes Identify length(s) and where used. NN Pipe runs between system Typical Longest 0 access points (feet): d Are junction boxes used at each bend? Yes _ No If not, explain where N I and why. 12 c ZI 12 E N Are downstream soffits at or below upstream soffits? Least amount that hydraulic Yes _ No _ If not, explain where and why: grade line is below gutter line (system -wide): STORMWATER DESIGN GUIDELINES Page 13 of 26 APPENDIX. D: TECH. DESIGN SUMMAR` Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.5) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Describe watercourse(s), or system(s) receiving system discharge(s) below v (include design discharge velocity, and angle between converging flow lines). 1) Watercourse (or system), velocity, and angle? N lG N E 2) Watercourse (or system), velocity, and angle? o E w m E 3) Watercourse (or system), velocity, and angle? T v � O O `p D m For each ouffall above, what measures are taken to prevent erosion or scour of Nreceiving and all facilities at juncture? 1) m 2) w 0 3) Are swale(s) situated along property lines between properties? No Yes Number of instances: For each instance answer the following questions. Surface treatments (including low -flow flumes if any): r- w I m } Flow line slopes (minimum and maximum): c m a 0 Vo 3 N N Q Will 100-year design storm runoff be contained within easement(s) or platted drainage ROW in all instances? Yes —No If "no" explain: STORMWATER DESIGN GUIDELINES Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.6) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Are roadside ditches used? _ No If so, provide the following: N t —Yes Is 25-year flow contained with 6 inches of freeboard throughout ? Yes No w _ _ Are top of banks separated from road shoulders 2 feet or more? Yes No _ _ Are all ditch sections trapezoidal and at least 1.5 feet deep? _ Yes No v J `m~\L For any "no" answers provide location(s) and explain: 0 ae If conduit is beneath a swale, provide the following information (each instance). Instance 1 Describe general location, approximate length: u, w Is 100-year design flow contained in conduit/swale combination? _ Yes No _ If "no' explain: o cm, „ Space for 100-year storm flow? ROW _ Easement _ Width Z c Swale Surface type, minimum Conduit Type and size, minimum and maximum and maximum slopes: slopes, design storm: 0 a m Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): c � m @ t 0 c 0 o Access Describe how maintenance access is provided (to swale, into conduit): 6 10 w = c Instance 2 Describe general location, approximate length: a � N c m Is 100-year design flow contained in conduit/swale combination? Yes No 'o _ If "no" explain: m e. c E w Space for 100-year storm flow? ROW Easement_ Width v Swale Surface type, minimum Conduit Type and size, minimum and maximum and maximum slopes: slopes, design storm: o a m Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): — w c 0 v � Access Describe how maintenance access is provided (to Swale, into conduit): STORMWATER DESIGN GUIDELINES Page 15 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.7) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) If "yes" provide the following information for each instance: Instance 1 Describe -general approximate length, surfacing: c n o w v Is 100-year design flow contained in swale? —Yes —No Is swale wholly } within drainage ROW? _Yes No Explain "no" answers: a� U Access Describe how maintenance access is provide: w o i0 U Instance 2 Describe general location, approximate length, surfacing: � a� n c w o E Is design flow contained in swale?Swale wholly "no" m m within d aaiinageYesNo E plain answers: o p --�>W Access Describe how maintenance access is provided: _U Z 0. Instance 3. 4, etc. If swales are used in more than two instances, attach sheet providing all above information for each instance. channels: Will any area(s) of concentrated flow be channelized (deepened, widened, or straightened) or otherwise altered? _ No Yes If only slightly shaped, see "Swales" in this Part. If creating side banks, provide information below. Will design replicate natural channel? _Yes _ No If "no", for each instance o a describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year o ru design flow, and amount of freeboard: N y Instance 1: C N E o Instance 2: 0 o _� w � Instance 3: m 0 U STORMWATER DESIGN GUIDELINES Page 16 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 ENDIX D - TECHNICAL DESIGN SUM Part 4 — Drainage Concept and Design Parameters Continued (Page 4.8) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Existing channels /small creeks): Are these used? No Yes _ If" es" provide the information below. Will small creeks and their floodplains remain undisturbed? Yes No How _ many disturbance instances? Identify each planned location_ For each location, describe length and general type of proposed improvement (including floodplain changes): For each location, describe section shape & area, flow line slope (min. & max.), \ surfaces, and 100-year design flow. v m c oWatercourses land tributaries): Aside from fringe changes, are Regulatory Watercourses proposed to be altered? No Yes Explain below. _ Submit full report describing proposed changes to Regulatory Watercourses. Address E existing and proposed section size and shape, surfaces, alignment, flow line changes, > length affected, and capacity, and provide full documentation of analysis procedures o and data. Is full report submitted? Yes No If "no" explain: a E c c vAll Proposed Channel Work: For all proposed channel work, provide information requested in next three boxes. If design is to replicate natural channel, identify location and length here, and describe design in Special Design section of this Part of Report. Will 100-year flow be contained with one foot of freeboard? —Yes —No If not, identify location and explain: Are ROW / easements sized to contain channel and required maintenance space? Yes _ No If not, identify location(s) and explain: STORMWATER DESIGN GUIDELINES Page 17 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.9) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) How many facilities for subject property project? t For each provide info. below. For each dry -type facilitiy: Facility 1 Facility 2 Acres served & design volume + 10% 115 ,29 230 543 GLL•Ti- 100-yr volume: free flow & plugged 23Dy{3 ZSosy3 Design discharge (10 yr & 25 yr) j (Q.02 q I- Lt 0 Spillway crest at 100-yr WSE? _ yes _ no yes _ no Berms 6 inches above plugged WSE? ^i /a yes _ no _yes no Explain any "no" answers: w a� For each facility what is 25-yr design Q, and design of outlet structure? Facility 1: 2. f�-S 0 z Facility 2: Do outlets and spillways discharge into a public facility in easement or ROW? Facility 1: Yes _No Facility 2: —Yes —No -moo If "no" explain: m 0 0 0 0 a- For each, what is velocity of 25-yf design discharge at outlet? & at s iliwa ? Facility 1: %• 3 & of/Pc Facility 2: & 3 Are energy dissipation measures used? No _ Yes Describe type and u- location: c 0 C UI O1 For each, is spillway surface treatment other than concrete? Yes or no, and describe: Q Facility 1: �Ex� R\P'— P j �FLOG�-C i �t�� e-V7oei Facility 2: For each, what measures are taken to prevent erosion or scour at receiving facility? Facility 1: Facility 2: If berms are used give heights, slopes and surface treatments of sides. Facility 1: Facility 2: STORMWATER DESIGN GUIDELINES Page 18 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY Part 4 — Drainage Conceat and Design Parameters Continued (Page 4.10) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Do structures comply with B-CS Specifications? Yes or no, and explain if "no": Facility 1; m LL Facility 2: c o C .= o w oFor additional facilities provide all same information on a separate sheet. Are parking areas to be used for detention? No What is —Yes maximum depth due to required design storm? Roadside Ditches: Will culverts serve access driveways at roadside ditches? No _ Yes If "yes', provide information in next two boxes. Will 25-yr. flow pass without flowing over driveway in all cases? Yes _ No Without causing flowing or standing water on public roadway? _Yes _ No Designs & materials comply with B-CS Technical Specifications? Yes —No Explain any "no" answers: N O) C oAre culverts parallel to public roadway alignment? _Yes _No Explain: U N Q I Creeks at Private Drives: Do private driveways, drives, or streets cross drainage m ways that serve Above -Project areas or are in public easements/ ROW? o N z _ No Yes If "yes" provide information below. How many instances? Describe location and provide information below. Location 1: U Location 2: Location 3: For each location enter value for: 1 2 3 Design year passing without toping travelway? Water depth on travelway at 25-year flow? Water depth on travelway at 100-year flow? For more instances describe location and same information on separate sheet. STORMWATER DESIGN GUIDELINES Page 19 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.11) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Named Regulatory Watercourses (& Tributaries): Are culverts proposed on these facilities? No Yes, then provide full report documenting assumptions, criteria, analysis, computer programs, and study findings that support proposed design(s). Is report provided? Yes _ No If "no", explain: Arterial or Maior Collector Streets: Will culverts serve these types of roadways? mNo Yes How many instances? For each identify the m location and provide the information below. Instance 1: Y n N Instance 2: o Instance 3: 0 O 'M Yes or No for the 100-year design flow: 1 2 3 zE o `c_ Headwater WSE 1 foot below lowest curb top? E Spread of headwater within ROW or easement? m Is velocity limited per conditions (Table C-11)? rn N c Explain any "no" answer(s): m � 0 0 o .- N U 3 0 a o Minor Collector or Local Streets: Will culverts serve these types of streets? o No Yes How many instances? for each identify the v _ location and provide the information below: a n @ w Instance 1: Nc Instance 2: m m o Instance 3: 0 For each instance enter value, or "yes" / "no" for: 1 2 3 m Design yr. headwater WSE 1 ft. below curb top? c 100-yr. depth at street crown 2 feet or less? max. E Product of velocity (fps) & depth at crown (ft) = ? Is velocity limited per conditions (Table C-11)? Limit of down stream analysis (feet)? Explain any "no" answers: STORMWATER DESIGN GUIDELINES Page 20 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.12) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) All Proposed Culverts: For all proposed culvert facilities (except driveway/roadside ditch intersects) provide information requested in next eight boxes. Do culverts and travelways intersect at 90 degrees? _ Yes No If not, identify location(s) and intersect angle(s), and justify the design(s): Does drainage way alignment change within or near limits of culvert and surfaced approaches thereto? No _ Yes If "yes" identify location(s), describe change(s), and justification: Are flumes or conduit to discharge into culvert barrel(s)? No _ Yes If yes, J C identify location(s) and provide justification: Are flumes or conduit to discharge into or near surfaced approaches to culvert ends? _ No _ Yes If "yes" identify location(s), describe outfali design treatment(s): c 0 0 0 m Is scour/erosion protection provided to ensure long term stability of culvert structural v components, and surfacing at culvert ends? Yes —No If "no" Identify locations and provide justification(s): Will 100-yr flow and spread of backwater be fully contained in street ROW, and/or drainage easements/ ROW? _ Yes _ No if not, why not? Do appreciable hydraulic effects of any culvert extend downstream or upstream to neighboring land(s) not encompassed in subject property? _ No Yes If "yes" describe location(s) and mitigation measures: Are all culvert designs and materials in compliance with B-CS Tech. Specifications? Yes _ No If not, explain in Special Design Section of this Part. STORMWATER DESIGN GUIDELINES Page 21 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.13) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Is a bridge included in plans for subject property project? :_ —No _ Yes If "yes" provide the following information. Name(s) and functional classification of the roadway(s)? What drainage way(s) is to be crossed? N 01 m (d A full report supporting all aspects of the proposed bridge(s) (structural, geotechnical, hydrologic, and hydraulic factors) must accompany this summary report. Is the report provided? —Yes No If "no" explain: Is a Stormwater Provide a general description of planned techniques: w Pollution Prevention —T �rnGN(a c7 Plan (SW3P) established for c�71 CoN�'�JCY orJ F N"i`2%'r>t3GF,� project construction? �Jotuat�� i�ID�oY�lUuct} No Yes Special Designs — Non -Traditional Methods Are any non-traditional methods (aquatic echosystems, wetland -type detention, natural stream replicaoion, BMPs for water quality, etc.) proposed for any aspect of subject property project? 1, No _ Yes If "yes" list general type and location below. Provide full report about the proposed special design(s) including rationale for use and expected benefits. Report must substantiate that stormwater management objectives will not be compromised, and that maintenance cost will not exceed those of traditional design solution(s). Is report provided? Yes No If "no" explain: STORMWATER DESIGN GUIDELINES Page 22 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.14) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Special Designs — Deviation From B-CS Technical Specifications If any design(s) or material(s) of traditional runoff -handling facilities deviate from provisions of B-CS Technical Specifications, check type facility(ies) and explain by specific detail element. Detention elements Drain system elements Channel features Culvert features Swales _ Ditches _ Inlets _Outfalls Valley gutters _ Bridges (explain in bridge report) In table below briefly identify specific element, justification for deviation(s). Specific Detail Element Justification for Deviation (attach additional sheets if needed) 1) 2) 3) 4) 5) Have elements been coordinated with the City Engineer or her/his designee? For each item above provide "yes" or "no", action date, and staff name: 1) 2) 3) 4) 5) Design Parameters Hydrology Is a map(s) showing all Design Drainage Areas provided? _ Yes No Briefly summarize the range of applications made of the Rational Formula: N 6NSF What is the size and loc tion of largest Design Drainage Area to which the Rational Formula has been applied? 1s Pr acres Location (or identifier): STORMWATER DESIGN GUIDELINES Page 23. of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.15) Design Parameters (continued) Hydrology (continued) In making deter inations for time of concentration, was segment analysis used? _ No Yes In approximately what percent of Design Drainage Areas? 1 13'0 % As to intensity -duration -frequency and rain depth criteria for deterrryming runoff flows, were any criteria other than those provided in these Guidelines used? ✓ No _Yes If "yes" identify type of data, source(s), and where applied: For each of the stormwater management features listed below identify the storm return frequencies (year) analyzed (or checked), and that used as the basis for design. Feature Analysis Year(s) Design Year Storm drain system for arterial and collector streets Storm drain system for local streets Open channels Swale/buried conduit combination in lieu of channel Swales Roadside ditches and culverts serving them Detention facilities: spillway crest and its outfall Apt ) po 21G� Detention facilities: outlet and conveyance structure(s) I kn�e� 2� Detention facilities: volume when outlet plugged Culverts serving private drives or streets Culverts serving public roadways Bridges: provide in bridge report. Hydraulics What is the range of design flow velocities as outlined below? Design flow velocities; Gutters Conduit Culverts Swales Channels Highest (feet per second) Lowest (feet per second) Streets and Storm Drain Systems Provide the summary information outlined below: Roughness coefficients used: For street gutters: For conduit type(s) Coefficients: STORMWATER DESIGN GUIDELINES Page 24 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.16) Design Parameters (continued) Hydraulics (continued) Street and Storm Drain Systems (continued) For the following, are assumptions other than allowable per Guidelines? Inlet coefficients? _No _Yes Head and friction losses —No —Yes Explain any "yes" answer: In conduit is velocity generally increased in the downstream direction? _Yes _ No Are elevation drops provided at inlets, manholes, and junction boxes? —Yes —No Explain any "no" answers: Are hydraulic grade lines calculated and shown for design storm? _ Yes _ No For 100-year flow conditions? _Yes _No Explain any "no' answers: What tailwater conditions were assumed at outfall point(s) of the storm drain system? Identify each location and explain: Open Channels If a HEC analysis is utilized, does it follow Sec VI.F.5.a? _ Yes _ No Outside of straight sections, is flow regime within limits of sub -critical flow? _ Yes _ No If "no" list locations and explain: Culverts If plan sheets do not provide the following for each culvert, describe it here. For each design discharge, will operation be outlet (barrel) control or inlet control? Entrance, friction and exit losses: Bridges Provide all in bridge report STORMWATER DESIGN GUIDELINES Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Continued (Page 4.17) Design Parameters (continued) Computer Software What computer software has been used in the analysis and assessment of stormwater management needs and/or the development of facility designs proposed for subject property project? List them below, being sure to identify the software name and version, the date of the version, any applicable patches and the publisher Part 5 — Plans and Specifications Requirements for submittal of construction drawings and specifications do not differ due to use of a Technical Design Summary Report. See Section Ili, Paragraph C3. Part 6 — Conclusions and Attestation Conclusions Add any concluding information here: Attestation Provide attestation to the accuracy and completeness of the foregoing 6 Parts of this Technical Design Summary Drainage Report by signing and sealing below. `This report (plan) for the drainage design of the development named in Part 8 was prepared by me (or under my supervision) in accordance with provisions of the ge Station Unified Drainage Design Guidelines for the owners of the property. ermits required by any and all state and federal regulatory agencie*�ge improvements have been issued or fall under applicable gener s• (Affix 'i`'%i�PS T`- �Y"i �il.1= IJ •1=, (�P'�r• e••••e e••..• Licensed Professional Engineer R •ee.•••• s State of Texas PE No. �35°33 A9 °.�� E g �•��jl/ a STORMWATER DESIGN GUIDELINES Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009