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Home My WebLink AboutC2008-078 - 3/11/2008 - ApprovedCITY OF CORPUS CHRISTI AMENDMENT N0.4 TO CONTRACT FOR PROFESSIONAL SERVICES The City of Corpus Christi, Texas hereinafter called "City", and GOLDSTON ENGINEERING INC. hereinafter called "Engineer", agree to the following amendments to the Contract for Professional Services for Storm Water Master Plan Pro'ect No. 2083 , as authorized by: Original Contract August 28, 2001 Motion No. M2001.336 $1,048,480.00 Amendment No. 1 April 22, 2003 Administrative Approval $0.00 Amendment No. 2 Amendment No. 3 September 21, 2004 March 21, 2006 Motion No. M2004-363 Administrative Approval $300,000.00 $7,785.00 EXHIBIT "A", SECTION 1. SCOPE OF SERVICES shall be modified to include the following tasks as described in the attached "Amendment No. 4, Exhibit A." Phase 1 -Storm Water Criteria and Design • Drainage Criteria Technical Guide for Subdivision Rules; • Drainage Criteria Manual reflecting adopted Council criteria; and • storm Water Design Reference document. Phase 2 -Revised Storm Water Master Plan Map Sheets • Revised Channel Alignments; • Revised BasinlSub-Area Delineation; • Revised Hydrologic Modeling; • HEC-RAS Analysis of Major and Intermediate Conveyance Systems; • Revised Map Sheet Fonnat; and • Master Plan Map Sheet Production. Phase 3 -Implementation Plan • Re-analysis (Hydraulic) of Oso Creels; • West Oso Creek LiDAR acquisitionlprocessing; • West Oso Creek Hydraulic Analysis; • Oso Creek PondinglDetentionAnolysis; and • CIP Cost Assessment of Major $ Intermediate conveyance sys#ems. - EXHIBIT "A", SECTION 3. FEES, PART C. SUMMARY OF FEES shall be modified as outlined in this amendment in Exhibit "B". All other terms and conditions of the August 28, 2009 contract between the City and Engineer, and of any amendments to that contract, which are not specifically addressed herein shall remain in full force and effect. CITY OF CORPUS CHRISTI r~ ~~~. ~ L~l~s . Escobar, P.E. Date I Brim Assistant City Manager RECOMMENDED ~ a ~ ~. D~ Kevin R. Stowers Date 2008-078 'ing 03/11/08 M2008-070 Goldston Engineering, Inc. ~ planV4md. No. 4wma. No. 4.doc GOLDSTON ENGINEERING, INC. ~.,,~ ~.~~. z [zz f os Sidney A. F~a`s, P.E. Date 210 S. Carancahua, Suite 200 Corpus Christi, TX 78403-2886 (361) 888-8100 Office; (361) 888-8600 Fax AMD. N0.4 Pa e 1 of 2 RE OM ENDED ~<3,~3 0 alerie Gray, P.E. Date ~'~Birector of Storm Water Department ATTEST Armando Chapa, City Secret APPROVED AST FORM Project Number: 2083 CIP # SW 25 r ,' , + ~ 2~i ~J Fund Source: 550950-4525-00000-460270 ~^-t. c~ Encumbrance Number: Assistant City Attorney Date ,~„~~ ~ ~'} AUTHOfiilk~ ~V1~4`~t..s ~../ l5 D ~IIRfi1/~~ ~• H:IHOME1RechellelGENlUrainege12683-SW Master PlenlAmd. No. 41Amd. No. 4.doc AMD. NO. a Pa e2of2 - ..~:. 210 South Carancahua ~ P.O. Boar 2886 Carpus Christi TX 78~0,~-2886 Phone (3o^IJ 888-BiDv = Fay' (3o ij rcr8-Sa"CIU e-maiL•gei~o7galdstanenyr, corn February 6, 2008 Mr. Kevin Stowers c/o Mr. Jerry Shoemaker, P.E. Interim Assistant Director City of Corpus Christi i LU i i.eopard atreet P.O. Box 9277 Corpus Christi, TX 78469 FEB 0 6 2008 A00084-00 1tE: Projected Schedule of Values associated Contract Amendment #4 to City of Corpus Christi Storm Water Master Plan (City Project 2083) Dear Jerry: This letter is sent in response to City staff request for a schedule of values anticipated during the execution of work associated with Contract Amendment #4 to City Project 2083. Presumption is made that work will begin in March 2008 and be completed by April 2009. Monthly invoices beginning in Apri12008 through May 2009 are anticipated. Based upon a contract amendment amount of $1,255,454 + $10,700 ~ $1,266,154 we project the following schedule of values: Service Period Month/ Invoice Amount Contract Balance 2126/08 - 3/25/08 A ri120(}8 $59,100 $1,207,054 3/26/08 - 4/25/08 Ma 2008 $47,200 $1,159,854 4126/08 - 5125108 June 2008 $111,300 $1,048,554 S/26/08 - 6125108 Jul 2008 $112,600 $935,954 6126108 - 7/3 1108 Jul .2008*Throu FY $103,100 $832,854 8101108 - 8125108 Se tember 2008 $110,000 $722,854 8126108 - 9/25108 October 2008 $120,000 $602,854 9126/08 -10125108 November 2008 $106,300 $496,554 10/26/08 -11125108 December 2008 $101,300 $395,254 11/26/08 ~ 12/25/08 Janu 2009 $67,600 $327,664 12/26/08 = 1/25/09 Februar 2009 96,100 $231,554 1126109 - 2125109 March 2009 109,800 $121,754 2126/09 - 3125/09 Aril 2009 79,200 $42,554 3126/09 - 4125109 Ma 2009 $42,554 $0 1:1PR03EC"I'S CC120001AD0084-DO City of CC -Master Arainage Plan 121~Q108-COlZRESPONDENCEIOWNERICityVxxteis12008 02 AMD. NQ. 4 Schedule of Values Letter.dce CORPUS GHFT/STI ~ HOUSTON EXHIBIT "A" o~..a ~ .,s w GOLDST~N ENG/NEER/NG, /NC. 210 South Carancahua • P.O. Bax 2B86 Corpus Christi, TX 78403-2886 Phone (361J 888-8700 • Fax (361J 888-8600 e-maii.• geinogo/dstonengr. com February 5, 2008 Mr. Kevin Stowers c/o Mr. Jerry Shoemaker, P.E. Interim Assistant Director City of Corpus Christi 12i}1 T.ennard Street P.O. Box 9277 Corpus Christi, TX 784b9 Aooos4-00 RE: Contract Amendment #4 to City of Corpus Christi Storm Water Master Plan (City Project 2083) Dear Jerry: This letter is revised to reflect discussion and negotiations for subject contract amendment from what was initially submitted to the City of Corpus Christi an May 18, 2007. The scope of work remains unchanged, the contract fee has been reduced 5% and the schedule has been adjusted based upon an anticipated notice to proceed of March 2008. BACKGROUND On December 19, 2006, the City Council adopted by Ordinance (second reading) the shaded portions of the Drainage Criteria Technical Guide for the Corpus Christi Drainage Criteria and Design Manual required to make revisions to the City of Corpus Christi Storm Water Master Plan map sheets. Since Council adoption, Goldston Engineering, Inc. (GEI) has worked with you and City staff to determine the remaining project work resultant from the change in the adopted criteria and additional City requirements. SCOPE OF WORK Exhibit A-1 {Scope of Services} for Contract Amendment Number 4 previously submitted remains unchanged. Significant work tasks by Phase of Work include the following: Phase 1 -Storm Water Criteria and Design • Drainage Criteria Technical Guide for Subdivision Rules; + Drainage Criteria Manual reflecting adopted Council criteria; and + Storm Water Design Reference document. J:1PRaJECTS CC120001AODD84-OD City of CC -Master Drainage Plan RFQ108-CORRESPONDENCE1aWNERICitylI,etters12U0$ Transinital Leeter.doc CORPUS CHRISTI • HOUSTON AMD. NO. 4 EXHIBIT "A" Paae 2 of 4 ~~ FED 0 ~ 2008 ~, f Ei~~;~4~~~,F~~i~j.i S1:r~ViGE Mr. Kevin Stowers c/o Mr. Jerry Shoemaker, P.E. February 5, 2408 Page 2 Phase 2 -Revised Storm Water Master Plan Map Sheets • Revised Channel Alignments; • Revised Basin/Sub-Area Delineation; • Revised Hydrologic Modeling; • HEC-RAS Analysis of Major and Intermediate Conveyance Systems; • Revised Map Sheet Format; and • Master Plan Map Sheet Production. Phase 3 -Implementation Plan • Re-analysis (Hydraulic) of Oso Creek; err. ~ n_._ rr ..__i_ r ~rti e n _!__._~.. .... ~:.., .~_ • VVGJL VDU V1GGll 1.11/til\ a~il1U1J1L1VlL~llVlrGbblllb', • West Oso Creek Hydraulic Analysis; • Oso Creek Ponding/Detention Analysis; and • CIP Cost Assessment of Major & Intermediate conveyance systems. PROJECT SCHEDULE: A project schedule in Microsoft Project format is enclosed for your use and reference. Assuming work can and will begin in March 2008, we anticipate work will be completed in fly CABS April 2009. We have sufficient dedicated personnel and resources to meet this schedule. Significant milestones to date and projected are shown below. COMPLETION COMPLETION COMPLETION ACTIVITY DATE DATE DATE Ori ' al Revised Amendment #4) Pra~ect Start U October 2001 Febru 2002 Level of Protection Research & January 2002 November 2002 Evaluation Polic Review & Recommendations Aril 2002 Janu 2003 Drainage Criteria Guidance July 2002 March 2004 Deeei~ier~99b Au ust 2008 Drainage Criteria Technical Guide ~T-.-.°-...~.°- ~nn~ Se tember 2008 Stakeholder In ut Jul 2002 S tember 2003 Storm Water Criteria and Design December 2002 October 2004 Manual Drainage Criteria Manual '~T""°'"'''°:'nn~ October 2008 Storm Water Design Reference SAAB November 2008 Storm Water Master Plan Ma Sheets December 2002 Febru 2005 Storm Water Map Sheets (Revised ~ -fig Criteria} A ri12009 Osa Creek Analysis March 7, 2005 March 2005 J:IPROJECTS CC120001A00084-00 City of CC -Master Drainage Plan RFQ108-CORRESPONDENCEIOWNER1CitylLetters1200$ 0: Transmital Letter.doc AMD. NO.4 EXHIBIT "A" Paae 3 of 4 Mr. Kevin Stowers c/o Mr. Jerry Shoemaker, P.E. February 5, 2008 Page 3 Oso Creek Re-Analysis ,.r,."°„~t.°"'n"3 Au ust 2008 Qso Creek Ponding/Detention February 2008 Anal sis October 2008 West Oso Creek Analysis November 2007 Jul 2008 Im lementation Plan Aril 18, 2005 A ri12005 Febru 2009 BUDGET We estimate a lump sum fee of Q' ,~'~o $1.,255,454 will be required to complete this work. A man-power labor budget estimate by significant milestone is attached for your review and incorporation into the contract documents. In closing, thank you for your continued assistance on this project. We appreciate the opportunity the City of Corpus Christi has extended Goldston Engineering, Inc. Very truly yours, GOLDSTON ENGINEERING, INC. G/ W' iam J. Green, P.E. Engineering Manager ' ne A. Faas P.E. dK-std y , Vice-President /~.~~.. WJG/cp Attachment: Revised Project Schedule 1:1PROJECTS CC120001A00084-OD City of CC -Master Drainage Plan RFQ108-CORRESPOI3T1E1VCElOWNERICitylLetters120C /~M~, NO.4 Transttvtal Letter.doc EXHIBIT "A" Pa e4of~4 Revised 5/18/2007 EXHIBIT A-1 CITY OF CORPUS -CHRISTI STORM WATER MASTER PLAN PROJECT (Project No. 2083) I. SCOPE OF SERVICES Remaining work on the project is reported and amended as follows: A. PHASE ONE- STORM WATER CRITERIA AND DESIGN I. Kick -Off Meeting c4 - U. lrUfT1~.11~1C Il. Level of Protection -Research and Evaluation a. - f. Complete III. Policy Review and Recommendations a. - c. Complete IV. Drainage Criteria Guidance a. 1. -12. Complete b. Add: Assist the Ci in the develo merit of a Drains a Cri#eria Technical Guide and re aration of 8 resentations for communi consensus. Document forms the basis for revised community Lerrel of Protection, Design Criteria Manual, and Storm Water Master Plan Map Sheets. V. Stakeholder Input Process a. - f. Complete VI. Storm Water Criteria and Design Manual a. - b. Previously complete. Add the following: a. Usin the revised Drains a Criteria Technical Guide criteria roduce Drainage Criteria Manual consisting of the following sections: i. Introduction AMD. N0.4 EJCHIHIT "A-1" P elof9 J:IPROJEC75 CC~20001A00084-00 City of CG -141aster Drainage Plan RFQ105-CON'TRACT'S & CHANGE OR1~E4tSlContrnct Amendments12007 iv9ay Contract Amendment t-412007 OS 18 CofCC Exhibit Al SwMP Revisions(Amend 4).doc Revised 5/18/2007 ii. Policies iii. Hydrology iv. Hydraulics v. Pavement Drainage, Roadside Ditches and Inlets vi. Detention Analysis vii. Pump Stations viii. Water Quality ix. Miscellaneous b. Using the followingsections of previously submitted DCDM (Draft} and the revised Drainage Criteria Technical Guide, prepare a. Storm Water Design Reference consisting of the following sections: i. Regulatory Authority ii. Hydrologic and Hydraulic Concepts iii. Crosion ana Sedimeni: Coniroi iv. Best Management Practices v. Acron ms and Abbreviations vi. Checklists vii. Exhibits viii. FEMA Compliance LiDAR Technical Report ix. G_lossary x. History xi. Level of Protection Technical Report xii. Master Plan Report xiii. References xiv. Work Books c. No change. B. PHASE TWO-DEVELOPMENT OF STORM WATER MASTER PLAN 1. Amend as follows: Prepare revised storm water master plan map sheets that were previously completed, using the Level of Protection and drainage criteria developed by the Drainage Criteria Technical Guide adopted by City Council on December 19, 2006. 2. a. Amend as follows: Using HEC-HMS, perform hydrologic modeling for existing and ultimate land development conditions as depicted by City Area Development Plans for Basins 1 through 9 previously described See Exhibit A of the basic contract and contract amendment No. 3 . Hydrofogic modeling will confom~ to the level of protection and drainage criteria established by the Drainage Criteria Technical Guide adopted by City Council on December 19.2006 and will incoroorate revised lntermed,iate, and Maior open channel alignmen#s with revised AMD. N0.4 EXHIBFT "A-1" P e2of9 J:IPROJECTS CC120001A00084-00 City of CC -Master Drainage Plan RFQI05-CONTRACTS & CHANGE ORDER51Contract Amendments12007Mgy Contract Amendment ~f412007 OS 18 ColCC Exhibit Al SWMP Revisions(Amend 4).doc Revised 5/18/2007 contributincLdrainac~e area boundaries, sub-basins and sub-areas described further below. 1.-8. No change. 9. Replace with the following: PadrelMustang Island - (PadrelMustang Island Basin is relatively flat and is located on a narrow Island. Only the base map with 2-foo# contours is shown on the Storm Water Master Plan Map Sheets. Sub-basin delineation and modeling is to be provided by separa#e contract authorization and released by the Texas Department of Transportation (Corpus Christi District). b. No change. c. Replace with the following: Design flows {Q's) for the ultimate land rieveiopmeni condition are cased upon the iand use criteria noted in the City's adopted Area Development Plans and will be shown on the Master Plan Map Sheets. 3. a. - b. Replace with the following: a. Using HEC-RAS, analyze a total of approximately 200 miles of "Major" open channels and approximately 120 miles of "Intermediate" open channels within Basins 1-9 noted in Section 1.B.2.a.1. - 9 (Exhibit A of the basic contract and contract amendment No. 2). Major and Intermediate channels include existing channels and ultimate land development channels, excluding Oso Creek (See Section 1.C.1 } and the Nueces River. The approximately 320 open channel miles comprise the HEC-RAS hydraulic open system modeling effort. b. Using STORM CAD, estimate the conveyance capacity approximately 95 miles of closed system trunk main infrastructure required for major and intermediate system conveyance (based upon Council approved Drainage Criteria Technical Guide). 4. Previously Complete. Add the following: Storm Water Master Plan Sheets -revised work product (based upon Council approved Drainage Criteria Technical Guide) replaces and amends previous contract scope of work to the following: a. Include the following elements in the mapped sheets: 1. Proposed drainage area boundaries, sub-basins and sub-areas for the protect. 2. Proposed drainage area boundaries, sub-basins and sub-araeas AMD. N0.4 EXHBIT "A-1" P e3of9 J:1PB03ECT5 CC120001A00084-00 City of CC -Master Drainage P3an RFQ\OS-CONTRACTS & CHANGE ORDERS1Contract Amendments12007 May Contract Amendment #412007 OS 1$ CofCC Exhibit Al S WMP Revisions{Amend 4}.doc Revised 5/18/2007 that have been revised and cannot be altered since commencement of the ro'ect due to on oin develo ment. Affected areas include: a} Master Channel 27 b) Master Channel 31 c) McNorton Ditch d) Lindale Area Drainage Improvements e) WIIIowlBrawner Parkwavl Procter Channel f) MansheimlGollihar Diversion g) Up River Road Improvements h) Goldston Di#ch i) US 77 Re Tonal Area Draina a Im rovements j} Down#own Drainage Improvements k) Rancho Vista Subdivision I) River Bend Ranch Subdivision rr~'} Tne Farces lvortnwesi au~urviSi~ri n) Bay Area Fellowship Church Subdivision o) Country Creek Unit 5 & 6 Subdivisions p) The Coves a# La o Vista Subdivision q) The Cornerstone Subdivision r) TxDOT Off-S stem Brid es: Kin sbu and Lexin ton s} MER Development t) TxDOT Carbon Plant Flvover u) TxDOT Park Road 22 Improvements v) TxDOT Crosstown Ex#ension Im rovements w) TxDOT SH 44 Improvements x) TxDOT US 77 Improvements y) TxDOT Carbon_Plant Road Flvover 3. 25- ear and 100- ear h draulic radient at selected ke locations in Maior Channels as determined by the. AIE in concurrence with Ci Engineer. 4. 25-year hydraulic gradient at selected ke locations in Intermediate Channels as determined by the AIE in concurrence with City Engineer. 5. Recommended Ri ht-of-W a and easement widths for ca aci and maintenance requirements: 6. Design flows at selected kev locations as determined by AIE in concurrence with City Engineer. 7. Existin and Re uired conve ance ca aci of closed s stem ~0" infrastructure and contributing drainage area. 8. TxDOT drainage infrastructure {outfall, crossing structure) capacity requirements. Requisite text documentation of the S#orm Water Master Plan is located in the S#orm Water Design Reference described above in Section I A. 6. b. AMD. N0.4 EXHIBCI' "A-1" Pa e4of9 J:IPROJF.CTS CC120001A00084-DO City of CC -114aster Drainage Plan RFQ105-CON1'rtACTS & CHANGE ORDErZSIContract Amendments12007 May Contract Amendment #412007 OS 18 Co4CC Exhibit Al SWN1P Re~isions(Amend 4).dce Revised 5/18/2007 5. a. - b. Replace with the following: a. Provide 2 foot interval contour ma in with inter olated 1-foot contour ma in for the PadrelMustan Island Basin oni based on LIDAR to o ra hic data where rocessed on aerial di ital base ma background. Note: SWMP Map Sheet information for PadrelMustang Island Basin will reflect Hydrologic and Hydraulic analysis completed by Goldston Engineering, Inc. under Work Authorization No. 6 to TxDOT Contract 16- 448P5004 (PadrelMustang Island Storm Water Master Plan}. b. The current available aerial background will be used as a background. c. No change. d. Replace with the following: Map sheet scale 1"=400' will be used for item B.4.a.12 Exhibit A contract amendment No. 3 for the (PadrelMustang Island Basin}. fi. Complete. 7. No change. 8. Complete C. PHASE THREE-~-iMPLEMENTATION PLAN {Stage 1) Stage 1 of Phase Three is Amended as follows: 1. Revised Preliminary Hydraulic Analysis of Oso Creek a. General 1. Replace with the following: Re-analyze a total of approxima#ely 25.9 open channel miles of Oso Creek (See Exhibit A-2) between Violet Road and Callicoate Road and Yorktown Bridge using revised criteria of Drainage Criteria Technical Guide approved by City Council on December 19, 2006. 2. - 5. No change. b. 1. -- 3. Complete. c. 1. - 2. No change. AMD. NO.4 EXHIBlf "A-I„ P e5of4 J:IPROJECTS CC120001A00084-00Clty of CC - lVlaster Drainage Plan RFQ1Q5-CONTRACTS & CHANGE ORDERS1Contract Amendmeats12007 May Contract Amendment #42007 OS l8 CoiCC F.xhihit Al SWMP Revisions{Amend 4).doc Revised 511$12007 3. Replace with the following: A revised ultimate land development condition HEC-HMS Oso Creek Basin models forthe Q~, Q25 and Q,oo storm events will use the revised criteria of the Drainage Criteria Technical Guide approved by City Council on December 19, 2006. 4. - 5. No change. 6. Replace with the following: A revised 100-year water surface inundation map will be provided and limits of inundation will be incorporated into Storm Water Master Plan Map Sheets. No storm surge or tidal effects will be included on this map or in the revised models. 7. - 8. No change. 9. Hdd: i i,e resuiiant model iaiiwater water surr"ace elevations will oe used in conjunction with the appropriate freguencv of coincidental .occurrence for assessment of o en channel outfall anal sis into Oso Creek. d. Amend as follows: Deliverables. The results of the Revised Preliminary Hydraulic Analysis of Oso Creek will be provided in one paper and one electronic copy of a technical memorandum with model inundation maps and will include the following: 1. - 3. No changes 4. Complete. 2. a. - e. Complete 3. Replace 3 a.1 - 4. with the following: 3. Implementation Plan -Stage 1 revised work product replaces previous contract scope of work as follows: a. An implementation plan for existing and proposed open Major and Intermediate open channels and existing closed system trunk main infrastructure analyzed by HEC-RAS analysis as noted respectively by 1.B.3.a {open channel) and I.B.3.b. (closed system) above will be based upon the Drainage Criteria Technical Guide approved by City Gouncil in December 2006 and will include the following: 1. Recommendations for respective channel cross section or trunk main size andlor crossing structure improvements (struc#ural details will not be included}. AMi7. N0.4 EXHIBIT "A-I" P e6of9 3:1PROlECTS CC120001A00064-00 City of CC -Master IJrainage Plan RFQ105-CONTRACTS & CHANGE ORDER51Contract Amendments120D7 May Contract Amendment #412007 OS I8 Co1CC Exhibit Al SWMP Revisions(Amend 4}.doc Revised 5/18/2007 2. Probable construction cost opinion (in 2008 dollars) and schedule by Intermediate and Major Channel. 3. A summary report for each recommended Intermediate, Major channel or closed system trunk main in City "C.I.P. (2004 Capital Improvements) format. 4. A recommended list of Implementation Plan -Stage 1 priority improvements based upon system conveyance capacity shortfalllAcre, percent existing and future Development CostlAcre and Cost/Acre. 5. Delete. 6. Delete. 4. Add: Preliminary Hydraulic Analysis of West Oso Creek a. General Analyze a tots[ of approximately 11 open channel miles of West Oso Creek See Exhibit A-2 from limits of LiDAR covera a near Robstown, TX) to confluence with Oso Creels using revised criteria of Drainage Criteria Technical Guide approved by City Council on December'! 9, 2006. 2. The analyses are preliminary and will not be performed to the same level of detail as a FEMA Flood Insurance Study. and therefore shall only be used for planning purposes and not„for,-flood„,insurance- related or regulatory purposes. 3. An estimate of water surface elevations and water surface inundation limits far both existing and ultimate land development condition (100- yearstorm event) will be ore~ared. Ultimate land development results will be based upon the land use criteria arovided by the adopted Area Development Plans within the West Oso Creek Basin. 4. Channel cross sections used in the analysis will be based upon existing LiDAR data and the additional FEMA Region VI LiDAR data (Preliminary - if available) for the stream segment reaches that fall outside the original LiDAR Data Processed boundary See Exhibit A- 31,; _ No survey of_chann_ el cross sections will be performed for this analysis. 5. Existing West Oso Creek crossing structure features for affected Grossing roadways (FM 1694, Violet Road, FM 2292 and Old Brownsville RoadIFM 665) will be incoroorated into the HEC-RAS model analysis based upon TxDOT and City record drawings. b. Hydrologic and Hydraulic Modeling and Inundation Mapping Development AMD. N0.4 Pa 7 of 9 J:1PR07EC1'S CC1200D1A00084-00 City of CC -Mash Drainage Plan 1tFQ105-CONTitACTS & CHANGE ORDERS1Conhact Amendments12007 May Contract Amepdment #412007 05 18 CofCC Exhibit Al SWMP Revisions(Amend 4).doc Revised 511 812 0 0 7 1. An existin land use condition HEC-HMS enerated West Oso Creek watershed model Q~ and the ultimate land develo ment condition HEC-HMS West Oso Creek Basin models for the Q5, Q,~ and Q,no Technical Guide a roved b Ci Council in December 2006. If model results indicate areas where the ma ed wa#er surface elevation .extends up to the basin boundary. the water surface inundation ma in will end at the basin bounds .Cross-basin flows will not be modeled in the h draulic or h drolo is anal sis. 2. The resultant from the ultimate land develo ment condition 100- ear water surface inundation limits of West Oso Creek will be incomorated into Storm Water Master Plan Map Sheets. ~. i ne resultant ultimate land develo ment condition model tailwater water surface eleva#ions will be used in coniunction with the appropriate frequency of coincidental occurrence for_assessment of open channel outfall analysis„into West Oso Creek. 5. Add: InundationlMitigation Analysis of Oso and West Oso Creek a. General: This work includes the identification of areas where structural flooding may occur for existing habitable structures at the time, of ~Itimate land development {100-year storm event) as demonstrated by inundation of re long) detention and stora a reservoirs will be identified to assist the City~in the continued acquisition of inland greenbelt and drainage)#ransportation corridors along Oso and West Oso Creek. The following tasks comprise this work: 1. Determination of areas of concem alon Oso and West Oso Creek will,involve the examination of current aerial oho#ographs overlain with the HEC-RAS generated inundation limi#s of ultimate land develo men# 100- ear storm event .Areas where a minimum of five L5shabitable structures appear to be inundated will be designated as an area of concem, subject to mitigation analysis. 2. Determination of the relative de th of floodin rior to miti ation for #he,designated area of concem will be derived from a comparison of the average ground elevation {LiDAR data) and the ultimate land development (100-year storm event) water surface elevation. 3. Using the Oso and West Oso Creek HEC-RAS Riverine models, a determination of the peak flow reduction necessary to produce water AMD. N0.4 EXHiB1T "A-1" Pa e8of9 1:1PROJECTS CC120001A90084-06 City of CC -Master Diaittage Plan RFQ1D5-CONTRACTS & CHANGE ORDERS1Contract Amendments12007 May Contract Amendment #412007 OS 18 CofCC Exhibit Al SWMP Revisions(Amend 4).doc Revised 5118120D7 surtace profiles below the averave around elevations for respective areas of concern will be corn leted. S nthetic h dro ra hs will be prepared using these peak flow reductions and compared with the unit h dro ra hs in the HEC-HMS models used to enerate the O o and West .Oso Creek flows. The volume difference for each area of concern will be computed, for mitigation assessmen#. 4. Identification of locations along Oso and West Oso Creek will_be determined _ fo_ r excavation of detentionlretention ponds that capturelstore mitigation volumes of peak flow discharges for reviousl identified areas of concern. Inte ration of these detentionlretention pond kocations with the 2002 - 2007 Park Master Plan for the Oso1V1lest Oso Creek greenbelt will be included on a planning map. ~. i ne resuiiani: ~ uu-near wafer surrace inundation limits (mitigated 1 for Oso and West Oso Creek will be depicted in an overlay to the 2002 - 2007 Master Parks Plan exhibi#. The locations of proposed detentionlretention ponds (mitigation, will aid future ,~lannin„g and acquisition as shown. AMD. N0.4 EXHIBIT "A-1" P e9of9 1:1PR07ECTS CC120001A00084-00 Ciry of CC -Master Drainage Plan RFQ145~CQNTRACTS 8c CHANGE ORDER51Cont~act Amendments12007 May Contract Amendment #412007 OS 18 Coi~C Exhibit Al SWMP Revisions(Ainend 4).doc STORM WATER MASTER PLAN PROJECT N0.2083 SUMMARY OF FEES ORIGINAL CONTRACT AMD. NO.f AMD. N0.2 AMD. N0.3 AMD. N0.4 TOTAL CONTRACT Bas ic Services 1 Phase One -Storm Water Criteria and Desi n Manual $216,365.00 $0.00 $0.00 $0.00 $152,670.00 $369,035.00 2 Phase Two - Development of Storrrr Water Master Plan includes LIDAR fii ht 740,820.00 0.00 11,725.00 1,410.00 684,725.00 1,438,680.00 3 Phase Three - Oso Creek Anal sis 288,275.00 3,000.00 428,759.00 720,034.00 Subtotal Basic Services Fees 957,185.00 D.00 300,000.00 4,410.00 1,266,154.00 2,527,749.00 Additional Services Allowance 1 To o ra hic Surve 52,500.00 O.OD 0.00 0.00 0.00 52,500.00 2 Additional Travel (8 one-daV meetings! 38.795.00 (5.000.001 non n nn n nn ~_~ ~o~ nn 3 S ecial Presentations 0.00 5,OOOA0 0.00 DAO 0.00 5,000.00 4 Emer enc O erations Inundation Ma in 3,375.00 D.DO 3,375.00 Subtotal Additional Services Fees 91,295.00 0.00 0.00 3,375.00 0.00 94,670.00 Total Authorized Fee $1,048,480.00 $0.00 $3DO,p00.00 $7,785.00 $1,266,154.00 $2,622,419.00 r-pprova~ uaie t1/1tS1'LUU1 412111003 9/21/2004 3/21/2006 3!7112008 EXHIBIT "B" Page 1 of 1 City of CO1'pUS CITY OF CORPUS CHRISTI Chnsti DISCLOSURE OF INTERESTS ~~~ City of Corpus Christi Ordinance 17112, as amended, requires all persons or firms seeking to do business with the City to provide the following information. Every question must be answered. If the question is not applicable, answer with "NIA". FIRM NAME:._ __Goldston Engineering, Inc. STREET:_210 S. Carancahua. Suite 200 CITY; Cor us Christi ZIP: 78403 FIRM is: 1. Corporation X 2. Partnership 3. $ale Owner 4. Association 5. Other DISCLOSURE QUESTIONS If additional space is necessary, please use the reverse side of this page or attach separate sheet. 1. State the names of each employee of the City of Corpus Christi Laving an ownership interest constituting 3% or more of the ownership in the above named firm. Name .Inh Tine anr! (:ih~ I']cnar4mnn~ rif tr.,.,....,i NIA 2. State the names of each official of the City of Corpus Christi having an ownership interest constituting 3% or more of the ownership in the above named firm. Name Title NIA 3. State the names of each board member of the City of Corpus Christi having an ownership interest constituting 3% or more of the ownership in the above named firm. Name Boats, Commission or Committee NIA 4. State the names of each employee or officer of a consultant for the City of Corpus Christi who worked on any matter related to the subject of this contract and has an ownership interest constituting 3% or more of the ownership in the above named firm. Name Consultant NIA CERTIFICATE I certify that all information provided is true and correct as of the date of this statement, that I have not knowingly withheld disclosure of any information requested; and that supplemental statements will be promptly submitted to the City of Corpus Christi, Texas as changes occur. Certifying Person: Sidney Faas. P.,E~,~,~~,~~~~ ~~ ~~ „ ,, ,,._, Title: Vice Prlesident Signature of Certifying Person: L~~',(.GG~ - ~ Date: Z f~2~ ~g EXHIBIT "C" Page 1 of 2 DEFINITIONS a. Board Member. A member of any board, commission or committee appointed by the City Council of the Gity of Corpus Christi, Texas. b. Employee. Any person employed by the City of Corpus Christi, Texas, either on a full or part time basis, but not as an independent contractor. c. Firm. Any entity operated for economic gain, whether professional, industrial or commercial and whether established to produce ordeal with a product or service, including but not limited to, entities operated. in the form of sole proprietorship, as self-employed person, partnership, corporation, Joint stock company, joint venture, receivership or trust and entities which, for purposes of taxation, are treated as non-profit organizations. d. OfFiciai. The Mayor, members of the City Council, City Manager Deputy City Manager, Assistant City Managers, Department and Division Heads and Municipal Court Judges o~ the City of Corpus Christi, Texas. e. Ownership Interest. Legal or equitable interest, whether actually or constructively held, in a firm, including when such interest is held through an agent, trust, estate or holding entity. Constructively held refers to holding or control established through voting (rusts, proxies or special terms of venture or partnership agreements. Consultant. Any person or firm, such as engineers and architects, hired by the City of Corpus Christi for the purpose of professional consultation and recommendation. EXHIBIT "C" Page 2 of 2