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Home My WebLink AboutExecutive Summary Report (3/10/2010)March 10, 2010 CONTACT INFORMATION Bleyl & Associates Project Engineering & Management Erika Bridges, E.I.T. Planning and Development Services City of College Station P 0 Box 9960 College Station, TX 77842 RE: Executive Summary Report Entergy Site Plan Dear Erika, As required by the City of College Station, Bleyl and Associates has prepared a Stormwater Management Technical Design Summary Report for submission and review for the referenced project. This report includes the Executive Summary Report, a completed Technical Design Summary, and other reference material needed for your review. 1. ENGINEER: Mark A. Savarino, P.E. Bleyl & Associates 1722 Broadmoor Drive Suite 210 Bryan, Texas 77802 2. OWNER: Charles Eric Jones 10998 Nunn Jones Rd College Station, Texas 77845 3. SUBMITTAL DATE: March 10, 2010 GENERAL PROJECT INFORMATION The owner wishes to build an electrical switch station for Entergy, Inc. as well as associated improvements including a crushed limestone base driveway and landscaping. The property is 16.615 acres however the proposed improvements will affect approximately 3.96 acres of the property. There are no additional phases planned. 1722 Broadmoor Suite 210 Bryan, TX 77802 Bryan Austin Conroe (979)- 268 -1125 (512)- 328 -7878 (936)- 441 -7833 (979)- 260 -3849 (512)- 328 -7884 Fax (936)- 760 -3833 Fax PROJECT LOCATION The proposed 16.615 acre project site is located on Switch Station Rd. approximately 1,000 feet northeast of the intersection of Appomattox Dr. and Switch Station Rd. The entire property falls within the city limits of College Station. The property is within the Carter's Creek Watershed. The northeastern property line of the tract is approximately 700 feet west of Carter's Creek. Because of its proximity to a primary channel, no detention is proposed. Due to the project being constructed within the floodplain, a No Adverse Impact Study has been completed for the site by Mitchell and Morgan. The study is provided under a separate cover. HYDROLOGIC CHARACTERISTICS Land cover on the property is mostly a dense Buffalo or prairie grass with a few scattered trees. The western side of the site is approximately sixteen feet higher than the eastern half and allows for existing runoff to sheet flow from west to east in a shallow concentrated manner. This flow crosses the neighboring tract to the east currently owned by the developer of this property. The subject property is bounded by a 77 acre tract owned by Richard Smith to the northwest, a 22 acre tract owned by Carl and Jeannie Kolbe to the southeast, a 2 acre tract owned by Oakwood Custom Homes to the south, and the existing City of College Station Switch Station to the southwest. Of these areas, runoff on site is generally received from the existing switch station site and the Richard Smith site and sheet flows in an easterly direction before exiting the site and entering Carter's Creek. This project will entail the construction of an approximate 2.48 acre limestone rock pad and switch station over the existing prairie grass surface as well as filling in an existing watering tank used for cattle. These will be the basis of the post developed flow calculations. STORMWATER MANAGEMENT Due to the proximity of the site to Carter's Creek, no detention of runoff is requested for this site. Based on this request, our stormwater plan is to essentially convey runoff across the developed site in a sheet flow / shallow concentrated manner and, after exiting the developed area, allow it to continue to be conveyed as was originally occurring. After flowing across the downstream property, the stormwater will enter Carter's Creek to the east. Pre- and post - developed flow rates have been calculated using initial assumptions which include runoff efficients of 0.33 for unimproved pasture land (low range for average slopes), 1.0 for impervious pond areas, and 0.40 for the limestone rock used to create the pad for the switch station site. Time of concentration calculations are based on segment analysis. Based on these considerations, the pre - developed and post - developed discharge rates are estimated as follows: Pre (cfs) Post (cfs) Q 9.78 9.95 Q10 13.35 13.59 Q25 15.25 15.52 Q50 17.24 17.55 Q1oo 18.00 18.32 Due to the slight increase in flow in the post developed conditions, we request the direct conveyance of this stormwater. Also, as previously mentioned, because of the proximity of the site to Carter's Creek and being inside of the creek's floodplain limits, a No Adverse Impact Study has been prepared by Mitchell and Morgan. Within this study, it was concluded that, with the use of the proposed compensatory storage provided to the northeast of the pad, the filling within the floodplain to construct the pad will not adversely impact the downstream base flood elevation. REFERENCE This Summary Report and one 26 -page design summary dated March 10, 2010, comprise the drainage report for this project. A copy of the Mitchell and Morgan "No Adverse Impact" Study is provided under a separate cover. Please contact me with any questions, or if you require any additional information to complete your technical review of this project. Sincerely, Mark Savarino, P.E. Project Manager TECHNICAL DESIGN SUMMARY 'SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY The Cities of Bryan and College Station both require storm drainage design to follow these Unified Stormwater Design Guidelines. Paragraph C2 of Section I11 (Administration) requires submittal of a drainage report in support of the drainage plan (stormwater management plan) proposed in connection with land development projects, both site projects and subdivisions. That report may be submitted as a traditional prose report, complete with applicable maps, graphs, tables and drawings, or it may take the form of a "Technical Design Summary ". The format and content for such a summary report shall be in substantial conformance with the description in this Appendix to those Guidelines. In either format the report must answer the questions (affirmative or negative) and provide, at minimum, the information prescribed in the "Technical Design Summary" in this Appendix. The Stormwater Management Technical Design Summary Report shall include several parts as listed below. The information called for in each part must be provided as applicable. In addition to the requirements for the Executive Summary, this Appendix includes several pages detailing the requirements for a Technical Design Summary Report as forms to be completed. These are provided so that they may be copied and completed or scanned and digitized. In addition, electronic versions of the report forms may be obtained from the City. Requirements for the means (medium) of submittal are the same as for a conventional report as detailed in Section III of these Guidelines. Note: Part 1 — Executive Summary must accompany any drainage report required to be provided in connection with any and development project, regardless of the format chosen for said report. Note: Parts 2 through 6 are to be provided via the forms provided in this Appendix. Brief statements should be included in the forms as requested, but additional information should be attached as necessary. Part 1 — Executive Summary Report Part 2 — Project Administration Part 3 — Project Characteristics Part 4 — Drainage Concept and Design Parameters Part 5 — Plans and Specifications Part 6 — Conclusions and Attestation STORMWATER MANAGEMENT TECHNICAL DESIGN SUMMARY REPORT Part 1 — Executive Summary This is to be a brief prose report that must address each of the seven areas listed below. Ideally it will include one or more paragraphs about each item. 1. Name, address, and contact information of the engineer submitting the report, and of the and owner and developer (or applicant if not the owner or developer). The date of submittal should also be included. 2. Identification of the size and general nature of the proposed project, including any proposed project phases. This paragraph should also include reference to applications that are in process with either City: plat(s), site plans, zoning requests, Page 1 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 STORMWATER DESIGN GUIDELINES Effective February 2007 SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY or clearing /grading permits, as well as reference to any application numbers or codes assigned by the City to such request. 3. The location of the project should be described. This should identify the Named Regulatory Watershed(s) in which it is located, how the entire project area is situated therein, whether the property straddles a watershed or basin divide, the approximate acreage in each basin, and whether its position in the Watershed dictates use of detention design. The approximate proportion of the property in the city limits and within the ETJ is to be identified, including whether the property straddles city jurisdictional lines. If any portion of the property is in floodplains as described in Flood Insurance Rate Maps published by FEMA that should be disclosed. 4. The hydrologic characteristics of the property are to be described in broad terms: existing land cover; how and where stormwater drains to and from neighboring properties; ponds or wetland areas that tend to detain or store stormwater; existing creeks, channels, and swales crossing or serving the property; all existing drainage easements (or ROW) on the property, or on neighboring properties if they service runoff to or from the property. 5. The general plan for managing stormwater in the entire project area must be outlined to include the approximate size, and extent of use, of any of the following features: storm drains coupled with streets; detention / retention facilities; buried conveyance conduit independent of streets; swales or channels; bridges or culverts; outfalls to principal watercourses or their tributaries; and treatment(s) of existing watercourses. Also, any plans for reclaiming land within floodplain areas must be outlined. 6. Coordination and permitting of stormwater matters must be addressed. This is to include any specialized coordination that has occurred or is planned with other entities (local, state, or federal). This may include agencies such as Brazos County government, the Brazos River Authority, the Texas A &M University System, the Texas Department of Transportation, the Texas Commission for Environmental Quality, the US Army Corps of Engineers, the US Environmental Protection Agency, et al. Mention must be made of any permits, agreements, or understandings that pertain to the project. 7. Reference is to be made to the full drainage report (or the Technical Design Summary Report) which the executive summary represents. The principal elements of the main report (and its length), including any maps, drawings or construction documents, should be itemized. An example statement might be: "One -page drainage report dated , one set of construction drawings ( sheets) dated , and a -page specifications document dated comprise the drainage report for this project." STORMWATER DESIGN GUIDELINES Effective February 2007 As Revised February 2009 Page 2 of 26 APPENDIX. D: TECH. DESIGN SUMMARY SECTION IX Part 2 — Project Administration Engineering and Design Professionals Information Name and Address: Jurisdiction cikc City: Bryan op(' 'fJf• NI College Station Engineering Firm N $t tt1 AsS ota { 1.. 1' •t`oadm Ste. • let Zrliart Tic 11802 Lead Engineer's Name and Contact Info.(phone, e -mail, fax): PNOkt Cn t.t. g•:tZt Feu: C■tE> %c.v - 4bYt Ern mSwv *art no& bte■(te•+SrnL.e4 trlork A. Sovo,d no ,YE Supporting Engineering ! Consulting Firm(s): t4 c.'v XE tho-yor. - Ay i\dvtesc. t.#1.9a ci S}v•ily PS S s Z - Stirt- Goraws5 i ErcSton CG.rOvo\ Developer / Applicant N CN ar%es Er'o Sm / oiiB Ntwo. Tortes R'+t C.attsc ;, Si+.� r , Tt - 11B5 ' Property Owner(s) if not Developer / Applicant (& address): MIA Start (Page 2.1) Date of Submittal: 3` lo LZOip Developer / Owner / Applicant Information Name and Address: Phone and e -mail: ..cs C414t -t-t44 - 1.4ts4 Other: Sewn T. Vex noes. Q• . SAr sE . vt, cla Oft Other contacts: �etb t1tt�►.�tl \- teric1 2V0- GALS Sort 14v.ttiht-W.- f.stit> 3Z't 4$40 Phone and e -mail: mifft Project Identification Development Name: Emre .4,11 SMJrvc.i STA'rtosJ Is subject property a site project, a single -phase subdivision, or part of a multi -phase subdivision? of 5a411-E If multi - phase, subject property is phase Legal description of subject property (phase) or Project Area: (see Section II, Paragraph B -3a) II. • 4e IS Acct. Tree. Iti\orkban F.erc.4• r Ltw5i.t.t • A - 41. Cotbtst "Bratos Coo r.4.1 t Tcxis 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): Al pro xcrebtip d oo0' pJ E oC -1'tvc sinkrsedil c r orc p.rrts. tox C2 r. sand Sw t 4th, a on ice . In City Limits? I Extraterritorial Jurisdiction (acreage): Bryan: acres. Bryan: — College Station: - College Station: t Et . to t S acres. Acreage Outside ETJ: STORMVYATER DESIGN GUIDELINES Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY Page 3 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 2 — Project Administration Continued (page 2.2) Project Identification (continued) Roadways abutting or within Project Area or subject property: 5%41/41 -* S# 10 Abutting tracts, platted land, or built developmenoots: �•hdwd w•3 C:o►y a CS Sw+h.1. S1+4n.i Cha'lcs Eric Zoya.S • Prat' 'ID * - �tss�19 4b1 Oakweea Cvl;o•y µ•12..-s - PION► - 3orS4o S 34 ar+.m L K..ttK - P=p !i1— 98151 Named Regulatory Watercourse(s) & Watershed(s): C.A.OKX Cre.04,. Tributary Basin(s): NIA Plat Information For Project or Subject Property (or Phase) Preliminary Plat File #: At /A Final Plat Status and File #: Date: Name: Vol /Pg: If two plats, second name: Status: MA File #: Date: Zoning lnformat,on For Project or Subject Property (or Phase) Zoning Type: 4 0 Existing Case Date AIM Status: N!A or Proposed? et K44r u s Case Code: Ai it? Zoning Type: AIM Existing Case Date '4 /A Status: or Proposed? N/A Case Code: W/A Stormwater Management Planning For Project or Subject Property (or Phase Planning Conference(s) & Date(s): Nisi Participants: N/4 Preliminary Report Required? IJ14 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. AI Pi SECTION IX STORNIWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY Page 4 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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 With Other Departments of Jurisdiction City (Bryan or College Station) Dept. Contact: Date: Subject: Coordination With Non - jurisdiction City Needed? Yes No 1 Summarize need(s) & actions taken (include contacts & dates): Coordination with Brazos County Needed? Yes No J Summarize need(s) & actions taken (include contacts & dates): Coordination with TxDOT Needed? Yes No 1 Summarize need(s) & actions taken (include contacts & dates): Coordination with TAMUS Needed? Yes No ✓ Summarize need(s) & actions taken (include contacts & dates): Permits For Project or Subject Property (or Phase) As to stormwater management, are permits required for the proposed listed below? If so, summarize status of efforts toward that objective work from any of the entities in spaces below. Actions (include dates) Entity Permitted or Approved . Status of US Army Crops of Engineers No I Yes US Environmental Protection Agency No 1 Yes Texas Commission on Environmental Quality No / Yes Brazos River Authority No / Yes SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 5 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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? C iorev4 Ns4 pa►muxt %o.nd I ■% O'1. I perv:ovs tovtr Site Development Project (select all applicable) Redevelopment of one platted lot, or two or more adjoining platted lots. ✓ Building on a single platted lot of undeveloped land. Building on two or more platted adjoining lots of undeveloped land. Building on a single lot, or adjoining lots, where proposed will not form plat a new street (but may include ROW dedication to existing streets). Other (explain): Subdivision Development Project Construction of streets and utilities to serve one or more platted lots. Construction of streets and utilities to serve one or more lots on proposed lands represented by pending plats. Describe Nature and Size of Proposed Site projects: building use(s), approximate floor space, impervious cover ratio. Subdivisions: number of lots by general type of use, linear feet of streets and drainage easements or ROW. 1_ sones4or►t rock p t"; ft ry.p pw..1 a e.pprotts..4.44.1 7, Alt or- • tolvOn „.,ca,or. , pwa •:‘‘ • Qtirw.cs b1t -11.1wetirort tiw.pexti:d rs covcr (wino, intrust .s Ogle • Project Is any work planned on and that is not platted If yes, explain: or on land for which platting is not pending? No Yes FEMA Floodplains Is any part of subject property abutting a Named Regulatory Watercourse (Section II, Paragraph B1) or a tributary thereof? No •l Yes Is any part of subject property in floodplain area of a FEMA - regulated watercourse? No Yes ./ Rate Map 4$OK►CO22oE Encroachment(s) into Floodplain areas planned? No Encroachment purpose(s): . 4/ Building site(s) Road crossing(s) Utility crossing(s) Other (explain): 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. N/A SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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? Yes Reference the study (& date) here, and attach copy if not already in City files. Is the stormwater earlier study? management plan for the property in substantial Yes No If not, explain how conformance with the it differs. No ✓ If subject property plan for the property is not part of multi -phase project, describe stormwater management 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. Do existing topographic features on subject property store or detain Describe them (include approximate size, volume, outfall, model, etc). '«r`• •s e,,r rrt'% % M t poe+o or■ S i i•c t ppro,c. O. poeta sLvres 14 *hear cot. os3c +c re1411■ons• 4. bt cAtt, d . bh giwrirvs Corn f•irw tsr: ore a •te'V S prof runoff? No .e Yes V ea- ++Y S I . 154.4. • Th:s per.a is proposc.J .4 . Any known drainage or flooding problems in areas near subject property? Identify: m; s prone c d oer i + w:-Wi w -*ANA. WO' ./ No Yes kr C Based (see Table on location of B -1 in Appendix Detention is required. study property in a watershed. is Type 1 Detention (flood control) needed? B) d Need must be evaluated. Detention not required. If the need for Type 1 Detention must be evaluated: What decision has been reached? By whom? ` tr altos 4 a. sve.(..`k ♦•.4x�s ... po�s4. � ►w C T %Q ws 4 dvect.h deorWtJ►ti.*''t 'tlr 114 SArpree-vwshilour is -C' °( vc.. • How was determination made? it, 'Pro .% ti4 ;Am is Ow Le...r ' s Cy C C.k. k Voticto e, a V.0.,4 tc.V. ck►Or1S O 'f" vc.ko . pci d.tht_lopte' for :noes SECTION IX APPENDIX D - TECHNICAL DESIGN SUMMARY STORMWATER DESIGN GUIDELINES Effective February 2007 Page 7 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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 Yes If yes, describe splits below. In Part 4 describe design concept for handling this. Watershed or Basin Larger acreage Lesser acreage #4104 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); I N Flow determination: Outline hydrologic methods and assumptions: N)A 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 NIA Conveyance Pathways (Section II, Paragraph C2) Must runoff from study property drain across lower properties before reaching a Regulatory Watercourse or tributary? No ./ Yes Describe length and characteristics of each conveyance pathway(s). Include ownership of property(ies). Runoce f'roryn s;44., mu's* dr44n 4 pprox. ")op' 4o Cave Ala. is C.-AA-V. vie. Sh•Aow 00 C ANStriatj Ciov.2. Ati flow i % cress 44%4. 5.0"4, Ownee'S G11,4krks eric "So •.cc ntAS4+bor :ns #rsdi Woes. d:sctia+r :ns i rA0 Cwr34x Crssk. SECTION 'X STORMINATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 8 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 3 — Property Characteristics Continued (Page 3.4) Hydrologic Attributes of Subject Property (or Phase) (continued) Conveyance Pathways (continued) Do drainage easements exist for part of pathway(s)? ✓ No any If for what part of length? % Created by'? plat, or yes, instrument. If instrument(s), describe their provisions. Yes Pathway Areas Where runoff must cross lower properties, describe characteristics of abutting lower property(ies). (Existing watercourses? Easement or Consent aquired ?) Cyr e CO M riAJACPCV �j S !VW. fieisiV+ bar; nos 4rv.tr ow . by Mr. C.I.oartts Frio 'Sofa s . 'T%.; s rFrs.c$ is r wle, vs) ofr' O&% X tsand " 44., Wek-tc s tope . - ,%44,yoce4y oQ +C pe,4 %..vsa M1i s rt.o , Avu-S, . Nearby Drainage Facilities Describe any built or improved drainage facilities existing near the property (culverts, bridges, lined channels, buried conduit, swales, detention ponds, etc). NIA Do any of design? n1 I A these have hydrologic or hydraulic influence on No Yes If yes, explain: proposed stormwater SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 9 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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. Tu.a. proy.c♦ S:4-c. ..:t1 bs. g ..itd Sru1, i Aim- 5:4 watt ret a ty t. ;r "o.[.F cirolvs upslrtt.tr, its as In 41 5runr +t 'ww c.r. Flo+.) u) i 11 4 .s.o. ►x a btt 44.1 ra.r. w.crost 441.a 1 iw►.tsio rs t re Lk. pad awd aow..rel 44.4. p. rt Land • Th grrel; ws 04 44.4. (ova is baste' on a. 1-43% po: r.4- t v% Atom cayvkir ar. a.t� rw o.i�rwa,ra 4o (.4.‘ s r% a. rtor ea .s-1 , . o. ,. c t , Dan so.rlh►wt i d:.rt.ekAoes . PJO .'...kart dtvelopo.eenf Peers .+ps•1-rtarrs araas smart Projct4cd. Discharge(s) To Lower Property(ies) (Section II, Paragraph El) Does project include drainage features (existing or future) proposed to become public via platting? ✓ No Yes Separate Instrument? ✓ No Yes Per Guidelines reference above, how will runoff be discharged to neighboring property(ies)? Establishing Easements (Scenario 1) .1 Pre - development Release (Scenario 2) Combination of the two Scenarios Scenario 1: If easements are proposed, describe where needed, and status of provide actions on each. (Attached Exhibit # ) Scenario 2: Provide general description of how release(s) will be managed to - development pre conditions (detention, sheet flow, partially concentrated, etc.). (Attached Exhibit # ) .atC.Ast A% - s;44- ;% pc01 il> bt. a: ■ vw+tslrofte. r oat. p&ii ar■d 4 %%A. tit isi rts poc.ci C *w.ptrvovs eove.i h piL T,11te1 ;r. 4 post Atx t.\opeol o....1 s art ocsl.. stash}•. hiSI.tr }4.1.4rs M..a. r>re.clwC loptd cond:41.e.s . Because. o4' 44s4s anal +%sc close,. prox•re►144,1 40 arkr's Cr a..1a. , wt pro d;rtot tor+vt. clt . 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. Tt.t. owro r or 44.4. rec.<<v.r propar is 44►t ckw optr of 4 prop&A -4.4. SECTION IX' STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 10 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.2) Stormwater Management Concept (continued) Within Proiect Area Of Multi -Phase Project ii ! A Will project result in shifting runoff between Basins or between Watersheds? No Identify gaining Basins or Watersheds and acres shifting: What design and mitigation is used to compensate for increased runoff from gaining basin or watershed? Yes How will runoff from Project Area be mitigated to pre- development conditions? Select any or all of 1, 2, and /or 3, and explain below. 1. With facility(ies) involving other development projects. 2 Establishing features to serve overall Project Area. 3. On phase (or site) project basis within Project Area. 1. Shared facility (type & locaton of facility; design drainage area served; relationship to size of Project Area): (Attached Exhibit # ) For Overall Project Area (type & location of facilities): (Attached Exhibit # ) 2. 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)? Are other Best Management Practices for reducing stormwater pollutants proposed? No Yes Summarize type of BMP and extent of use: If design of any runoff- handling facilities deviate from provisions of B -CS Technical Specifications, check type facility(ies) and explain in later questions. Detention elements Conduit elements Channel features Swales Ditches Inlets Valley gutters Outfalls Culvert features Bridges Other SECTION IX' STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 11 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.3) Stormwater Management Concept (continued) Within Project Area Of Multi -Phase Project (continued) A/ IA Will Project Area include bridge(s) or culvert(s)? No Yes Identify type and general size and In which phase(s). If detention /retention serves (will serve) overall Project Area, describe how it relates to subject phase or site project (physical location, conveyance pathway(s), construction sequence): 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): NIA Identify whether each of the types of drainage features listed below are included, extent of use, and general characteristics. Typical shape? Surfaces? u) u } 0 '5 Steepest side slopes: Usual front slopes: Usual back slopes: Flow line slopes: least Typica distance from travelway: (Attached Exhibit # ) typical a 0 (, z ° \ °' greatest Are longitudinal culvert ends in compliance with B -CS Standard Specifications? Yes No, then explain: Q °' `5 cs.. >- At intersections or otherwise, do valley gutters cross arterial or collector streets? No Yes If lain: explain: Y P U "6 L N u) a7) ) 5 o Are valley gutters proposed to cross any street away from an intersection? No Yes Explain: (number of locations ?) N 2 1 Q SECTION IX APPENDIX D — TECHNICAL DESIGN SUMMARY STORMWATER DESIGN GUIDELINES Effective February 2007 Page 12 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.4) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Are streets with curb and gutter used? (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. Will inlet size and placement prevent exceeding allowable water spread for 10 -year design storm throughout site (or phase)? Yes No If no, explain. Sag curves: Are inlets placed at low points? Yes No Are inlets and conduit sized to prevent 100 -year stormflow from ponding at greater than 24 inches? Yes No Explain "no" answers. 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. Is storm drain system used? ✓ No Yes Are any 12 -inch laterals used? No Yes Identify length(s) and where used. Pipe runs between system access points (feet): Typical Longest Are junction boxes used at each bend? Yes No If not, explain where and why. Are downstream soffits at or below upstream soffits? Yes No If not, explain where and why: Least amount that hydraulic grade line is below gutter line (system - wide): SECTION APPENDIX D - TECHNICAL DESIGN SUMMARY STORMWATER DESIGN GUIDELINES Effective February 2007 Page 13 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX Part 4 — Drainage Concept and Design Parameters Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) a) U co 0) o a , E O o c E E "Cc; co N cn a> c .E > o -0 a D ar a� io co 0 m v, 0 a) N co 0 Are Num Continued (Page 4.5) Describe watercourse(s), or system(s) receiving system discharge(s) below (include design discharge velocity, and angle between converging flow lines). 1) Watercourse (or system), velocity, and angle? 2) Watercourse (or system), velocity, and angle? 3) Watercourse (or system), velocity, and angle? For each outfall above, what measures are taken to prevent erosion or scour of receiving and all facilities at juncture? 1) 2) 3) swale(s) situated along property lines between properties? No ber of instances: For each instance answer the following questions. Yes Surface treatments (including low -flow flumes if any): Flow line slopes (minimum and maximum): Outfall characteristics for each (velocity, convergent angle, & end treatment). 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 Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX P w STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 15 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Irt 4 — Drainage Concept and Design Parameters Continued (Page 4.6) Stormwater Management Concept (continued thin Or Serving Subject Property (Phase, or Site) (continued) Roadside Ditches Are roadside ditches used? No Yes If so, provide the following: ? Yes No Is 25 -year flow contained with 6 inches of freeboard throughout Are top of banks separated from road shoulders 2 feet or more? Are all ditch sections trapezoidal and at least 1.5 feet deep? Yes No Yes No For any "no" answers provide location(s) and explain: (on separate sheet provide same information for any additional instances) If conduit is beneath a swale, provide the following information (each instance). Instance 1 Describe general location, approximate length: Is 100 -year design flow contained in conduit/swale combination? If "no" explain: Yes No Space for 100 -year storm flow? ROW Easement Width Swale Surface type, minimum Conduit Type and size, minimum and maximum and maximum slopes: slopes, design storm: Inlets Describe how conduit is loaded (from streets /storm drains, inlets by type): Access Describe how maintenance access is provided (to swale, into conduit): Instance 2 Describe general location, approximate length: Is 100 -year design flow contained in conduit /swale combination? If "no" explain: Yes No Space for 100 -year storm flow? ROW Easement Width Swale Surface type, minimum Conduit Type and size, minimum and maximum and maximum slopes: slopes, design storm: Inlets Describe how conduit is loaded (from streets /storm drains, inlets by type): Access Describe how maintenance access is provided (to swale, into conduit): SECTION IX P w STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 15 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.7) Stormwater Management Concept (continued Within Or Serving Subject Property (Phase, or Site) (continued) c CU E a o w ( I; E } If "yes" provide the following information for each instance: Instance 1 Describe general location, approximate length, surfacing: Is 100 -year design flow contained in swale? Yes No Is swale wholly within drainage ROW? Yes No Explain "no" answers: a) 0 ` - o Z a 0 -0 a) ' C a) o E .c a) .§ m a o 0) O 1 U 7 Q Access Describe how maintenance access is provide: Instance 2 Describe general location, approximate length, surfacing: Is 100 -year design flow contained in swale? Yes No Is swale wholly w drainage ROW? Yes No Explain "no" answers: Access Describe how maintenance access is provided: Instance 3. 4, etc. If swales are used in more than two instances, attach sheet providing all above information for each instance. c- .a "New" 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 cn o a o w 0- w g3 c >_ a) E a) > 0 L 0_ E o . z a) g \ CO 0 describe section shape & area, flow line slope (min. & max.), surfaces, and 100 -year design flow, and amount of freeboard: Instance 1: Instance 2: Instance 3: SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY Page 16 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.8) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) nJ /►a 1, a> .E' 8 a Submit E > 2 a E a c as U Existing channels (small creeks): Are these used? No Yes If "yes" provide the information below. their floodplains remain undisturbed? Yes No How Will small creeks and 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. Watercourses (and tributaries): Aside from fringe changes, are Regulatory Explain below. Watercourses proposed to be altered? No Yes full report describing proposed changes to Regulatory existing and proposed section size and shape, surfaces, alignment, length affected, and capacity, and provide full documentation and data. Is full report submitted? Yes No Watercourses. Address flow line changes, of analysis procedures If "no" explain: All 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? not, identify location and explain: Yes No If Are ROW / easements sized to contain channel and required Yes No If not, identify location(s) and explain: maintenance space? SECTION`IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 17 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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? For each provide info. below. For each dry -type facilitiy: Faci ity 1 Faci ity 2 Acres served & design volume + 10% 100 -yr volume: free flow & plugged Design discharge (10 yr & 25 yr) Spillway crest at 100 -yr WSE? yes no yes no Berms 6 inches above plugged WSE? yes no yes no 0 0 Z I For Explain any "no" answers: each facility what is 25 -yr design Q, and design of outlet structure? Facility 1: Facility 2: Do outlets and spillways discharge into a public facility in easement or ROW? Facility 1: Yes No Facility 2: Yes No cu 0) 0 a 0 L d F. 5 u_ c 0 0 0 0 E Q If "no" explain: For each, what is velocity of 25 -yr design discharge at outlet? & at spillway? Facility 1: & Facility 2: & Are energy dissipation measures used? No Yes Describe type and location: For each, is spillway surface treatment other than concrete? Yes or no, and describe: Facility 1: 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: SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY Page 18 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX Facility 2: APPENDIX D - TECHNICAL DESIGN SUMMARY Part 4 — Drainage Concept and Design Parameters Stormwater Management Concept (continued) Continued (Page 4.10) 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; For additional facilities provide all same information on a separate sheet. Are parking areas to be used for detention? No Yes What is 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: Are culverts parallel to public roadway alignment? Yes No Explain: Creeks at Private Drives: Do private driveways, drives, or streets cross drainage ways that serve Above - Project areas or are in public easements/ ROW? No Yes If "yes" provide information below. How many instances? Describe location and provide information below. Location 1: Location 2: Location 3: For each location enter value for: 1 Design year passing without toping travelway? Water depth on travelway at 25 -year flow? 2 3 Water depth on travelway at 100 -year flow? For more instances describe location and same information on separate sheet. STORMWATER DESIGN GUIDELINES Effective February 2007 Page 19 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX Part 4 — Drainage Concept and Design Parameters 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: a) w U) m C3 } a 0 0 C 0 o io z 0 a) 0 ' co cn 0 1- es ■ >, (6 (o O - a) N o .� U U v) te a' 0_ a) co _a 0 >, a) u) co 0) o - > a' U � C U co • C a> 0 E Arterial or Major Collector Streets: Will culverts serve these types of roadways? No Yes How many instances? For each identify the location and provide the information below. Instance 1: Instance 2: Instance 3: Yes or No for the 100 -year design flow: Headwater WSE 1 foot below lowest curb top? Spread of headwater within ROW or easement? Is velocity limited per conditions (Table C -11)? Explain any "no" answer(s): Minor Collector or Local Streets: Will culverts serve these types of streets? No Yes How many instances? for each identify the location and provide the information below: Instance 1: Instance 2: Instance 3: For each instance enter value, or "yes" / "no" for: Design yr. headwater WSE 1 ft. below curb top? 100 -yr. max. depth at street crown 2 feet or less? Product of velocity (fps) & depth at crown (ft) _ ? Is velocity limited per conditions (Table C -11)? Limit of down stream analysis (feet)? 1 1 Continued (Page 4.11) 2 2 3 3 Explain any "no" answers: STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 20 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX Part 4 — Drainage Concept and Design Parameters Stormwater Management Concept (continued) Continued (Page 4.12) Within Or Serving Subject Property (Phase, or Site) (continued) IJ f A 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, 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 outfall design treatment(s): Is scour /erosion protection provided to ensure long term stability of culvert structural 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 Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 21 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.13) Stormwater Management Concept (continued) Within Or Serving Subject Property (Phase, or Site) (continued) Q) M L W Is a bridge included in If "yes" provide the following plans for subject property project? ✓ No Yes information. Name(s) and functional classification of the roadway(s)? What drainage way(s) is to be crossed? A full report supporting all aspects of the proposed bridge(s) (structural, hydrologic, and hydraulic factors) must accompany this summary provided? Yes No If "no" explain: geotechnical, report. Is the report Is a Stormwater Pollution Prevention 173 Plan (SW3P) 0 established for IT) project construction? 5 No ✓ Yes Provide a general description of planned techniques: 5: W cc."ct , C w.,Orc c En.1,rw„ia� / Est. A- Special Designs — Non - Traditional Methods Are any non - traditional methods replication, BMPs for water quality, ✓ No Yes If "yes" list (aquatic echosystems, wetland -type detention, natural stream etc.) proposed for any aspect of subject property project? general type and location below. Provide full report about the proposed expected benefits. Report must be compromised, and that maintenance solution(s). Is report provided? Alin special design(s) including rationale substantiate that stormwater management cost will not exceed those of traditional Yes No If "no" explain: for use and objectives will not design SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 22 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY Page 23 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 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 IJ ),t 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. Drain system elements Channel features Detention elements Swales Ditches Inlets Outfalls Culvert features 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 Design Drainage Areas provided? Yes ✓ No Is a map(s) showing all Briefly summarize the range of applications made of the Rational Formula: wa�vc.1c rS Natm.lah+d pct s.+nd peer ge,.rcto9Ecl` pes.1� 410.�S 1,5; "S F dcSer to EA cLC -stg•% 5v4.14.%iv S o►+va 4 8 - 147ks .+o Rppe"a lsc C a4' v i d o v J . r e v a - A Y % 44:c c \ 10 r wNDIX c.66X4 c.r of o .4 o.s Vst•i 4. r Jew- rock- peo% bt-sut Pe. S 'vv..; ls.r p4b .dk vaSv e s c. r r►.is 4 pc .4 SJ.rFS.s&.. What is the size and location of largest Design Drainage Area to which the Rational Formula has been applied? "E•'3 acres Location (or identifier): SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY Page 23 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.15) Design Parameters (continued) Hydrology (continued) In making determinations for time of concentration, was segment analysis used? No ✓ Yes In approximately what Design Drainage percent of Areas? /00 As to intensity- duration- frequency and rain depth criteria for determining 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 /41/A Storm drain system for local streets N/A Open channels N/A Swale /buried conduit combination in lieu of channel NSA Swales NSA Roadside ditches and culverts serving them Alin Detention facilities: spillway crest and its outfall N/A Detention facilities: outlet and conveyance structure(s) NIA Detention facilities: volume when outlet plugged AIM Culverts serving private drives or streets NM Culverts serving public roadways N/A Bridges: provide in bridge report. AI M Hydraulics What is the range of design flow velocities as outlined below? Al 1P 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: - — SECTION IX STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 24 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX • STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 Part 4 — Drainage Concept and Design Parameters Continued (Page 4.16) Design Parameters (continued) Hydraulics (continued) ,.! /A 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? Are elevation drops provided at inlets, manholes, and junction boxes? Explain any "no" answers: Yes No Yes No Are hydraulic grade lines calculated and shown for design storm? For 100 -year flow conditions? Yes No Explain any Yes No "no" answers: What tailwater conditions were assumed at outfall point(s) of the storm drain system? each location and explain: Identify Open Channels If a HEC analysis is utilized, does it follow Sec \ /I.F.5.a? Yes No Outside of straight sections, is flow regime within limits of sub - critical If "no" list locations and explain: flow? Yes No 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 SECTION IX • STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D - TECHNICAL DESIGN SUMMARY Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009 SECTION IX Part 4 — Drainage Concept and Design Parameters 1 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 HI, Paragraph C3. Part 6 — Conclusions and Attestation Conclusions Add any concluding information here: — Extct+vt SwN►nnarry VoLfocc4 - ace P.d ie rsc' lnnpa.c Sorvaiy (Unckrr Sepeuralc. cvvc i ) 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 B was prepared by me (or under my supervision) in accordance with provisions of the Bryan /College Station Unified Drainage Design Guidelines for the owners of the property. All licenses and permits required by any and all state and federal regulatory agencies for the proposed drainage improvements have been issued or fall under applicable general permits." (Affix Sea /) =�' OF TF � censed Profes Iona/ Engineer i ` ' ;� ' ' I o 0 MARK A. SAVARINO 0 / j #∎ 105149 ies X11 t .' ��CENS��'vJ State of Texas PE No. I OS l M-k a STORMWATER DESIGN GUIDELINES Effective February 2007 APPENDIX D — TECHNICAL DESIGN SUMMARY 3- 10- 7-0'0 Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY As Revised February 2009