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Home My WebLink AboutC2016-030 - 1/19/2016 - NA CITY OF CORPUS CHRISTI AMENDMENT NO. 1 CONTRACT FOR PROFESSIONAL SERVICES The City of Corpus Christi, Texas, a Texas home-rule municipal corporation ("City") and HDR Engineering, Inc. ("Consultant"), agree to the following amendments to the Contract for Professional Services for Oso Creek Basin Drainage Relief— Draft Flood Insurance Rate Maps (Firms) Assessment(Project No. E10201): Original Contract June 9, 2015 Administrative Approval $29,590.00 In the Original Contract, Exhibit "A", Section I. Scope of Services shall be amended as set forth in the attached Amendment No.1, Exhibit "A". In the Original Contract, Section 3.1 shall be amended based on the modified scope of services in the attached Amendment No. 1, Exhibit"A"for a fee not to exceed $20,359.00,for a total restated fee not to exceed$49,949.00. All other terms and conditions of the June 9, 2015 Contract for Professional Services between the City and Consultant, and of any amendments to that contract,which are not specifically addressed herein shall remain in full force and effect. lam, CI Y F CO- •U 3 CHRISTI / HDR ENGINEERING, INC. �.,/ J lel !`� I�rw I/l/ ,/ . C�`%e!!/ /! '/�D•�S Va ie H. Gly, E. /«��(P at Art ur B. Colwell, P.E. Date Executive Directo of Public Works Vice President 555 N. Carancahua, Suite 1600 Corpus Christi, TX 78401 RECOMMENDED 361-696-3300 Office � , 1- -/ 5 ,4 Op rating Department Date APPROVED AS TO LEG • L FORM 2 /// /_, T,R, A istant C ty Attorne Date Project No. E10201 Accounting Unit: 3495-043 Account: 550950 APP VEIL Activity: E10201013495EXP Account Category: 50950 Fund Name: Storm Water 2012B Rev Bonds ^ �� D'at(e Encumbrance No. 9 Office f ana ement and Budget ATTEST D, 6,e ,e,,,,,,,_ ki--, . a Ate,-, 13-0/i (c, 2016-030 Da e 1/19/16 HDR Engineering Inc. 2\E10201 OSO CREEK BASIN DRAINAGE REFLIEF\HDR\AMENDMENT 1\2015-1001 AMENDMENT TO CONTRACT PROFESSIONAL REV.10/1/15 INDEXED ‘)% November 3, 2015 256912 (rev.1) Mr. Jeff Edmonds, P.E., Director, Capital Programs City of Corpus Christi P.O. Box 9277 Corpus Christi, TX 78469-9277 RE: PROPOSAL FOR ADDITIONAL SERVICES FOR OSO CREEK BASIN DRAINAGE RELIEF (PROJECT NO. E10201) Dear Mr. Edmonds: Thank you for inviting HDR to submit this proposal for additional professional engineering services on the above-referenced project. Our previous services consisted of review and general assessment of the draft/preliminary Flood Insurance Rate Maps (FIRMs) proposed by the Federal Emergency Management Agency (FEMA) for the Oso Creek floodplain from Oso Bay at Ocean Drive to the confluence of Oso Creek and La Voila Creek. Based on the assessment,_HDR recommended refinements to the hydraulic modeling performed by FEMA. During a meeting between City staff and HDR on August 26, 2015, the City asked HDR to provide a proposal to supply FEMA with additional information that will be needed for the modeling refinements. FEMA released the Preliminary FIRMs for Nueces County in October 2015, and the City will provide the additional information to FEMA during the statutory 90-day appeals period. HDR's proposed services consist of the following: SCOPE OF SERVICES The recommended model refinements are to incorporate additional surveyed cross sections. and • refine the n-values and channel bank stations to use the horizontal n-value input rather than the left overbank, right overbank and channel n-values. FEMA has agreed to have their contractor implement these changes to the RAS model based on the additional data that the City provides. HDR will provide the following information to the City to submit to FEMA in support of refinements to their riverine hydraulic model for the Oso Creek floodplain: 1. FEMA surveyed 15 cross sections along the study reach, and incorporated the survey data within other cross sections cut from a digital elevation model. According to the surveyed cross section location exhibit in Appendix D of their report, Naismith Engineering surve ed 20 cross sections downstream of the e sting :_ a•gel e -a and an additional 4- oss section . •i. th- study reach up to the confluence of La Vo a Creek. The City will provide the survey data for e 'aismith Engineering cross �_ l hdrinc.com 555 N.Carancahua,Suite 1600 Corpus Christi,TX 78401 T 361-696-3300 F 361-696.3385 Mr. Jeff Edmonds, P.E. 256912 November 3,2015 (rev.1) Page 2 of 3 Q• sections to HDR, including the georeferenced locations as shown in the exhibits, as well as the RAS model for existing conditions from the Naismith Engineering study., HDR will review each cross section and determine which cross sections should be incorporated into the FEMA RAS model to more accurately reflect existing conditions. 2. HDR also recommended that the n-values and channel bank stations be revised to more accurately reflect the existing vegetative conditions along Oso Creek. Based on the latest readily-available aerial photography, HDR will draw polygons in ArcGIS around areas of similar vegetation and include the recommended n-value as an attribute of each polygon. This information will be provided in .shp or.gdb format for the entire study reach 3. To provide an initial indication of the potential reduction in 1% annual-chance- exceedance water surface elevations that will be calculated by FEMA HDR will develop an updated RAS model. HDR's model will ... - FEMA's e. 'as 2i m..el b incorporating the recommended cross sections and n-values. Although the final RAS model will be prepared by FEMA's consultant, the updated RAS model prepared by HDR will be useful to quantify the potential reduction while the appeal is being processed by FEMA, and will also provide a comparison with FEMA's results. ASSUMPTIONS AND LIMITATIONS HDR's proposal for the services and fee described herein is based on the following assumptions and limitations: 1. This effort will be limited to assembly of model input data from readily-available existing sources and standard hydraulic analysis guidelines. Detailed analysis, data collection, calculations, or other items are not included. 2. HDR has budgeted for participation in one conference call with FEMA. FEE, DELIVERABLES,AND SCHEDULE HDR proposes to provide these additional services as an amendment to our existing contract for project E10201. We are requesting authorization for this additional work through a formal Scope Change Document and associated fee agreement. Our proposed lump-sum fee for these additional services is $20,359, increasing our total contract amount to $49,948. A summary of the proposed amount for this amendment, and the revised total contract amount. is provided below. All deliverables will be provided to the City as data files on DVD. This proposal is valid for 45 days from the date of this letter. 555 N Carancahua,Suite 1600,Corpus Christi,TX 78401 T 361.696 3300 hdrinc.com Mr. Jeff Edmonds, P.E. 256912 November 3,2015 (rev.1) Page 3 of 3 Approximate Previously- Proposed Fee , Task Schedule of Authorized for Additional Total Completion Fee Scope Tasks 1 through 6: Review and general { assessment of the drafUpreliminary FIRMs (Previously $29,590 N/A $29,590 (Original Scope,Previously Completed). Completed) Task 7: Provide refined modeling input Approximately 2 data to FEMA(Additional Scope). months from NTP N/A $20,359 $20,359 $49,94P Thank you again for considering us for this important project. Please do not hesitate to contact Dan Heilman at 361-696-3344 if you have questions or require any additional information. Sincerely, HDR ENGINEERING, INC. Daniel J. Heilman, P.E. Arthur B. Colwell, P.E. Project Manager Vice President/Managing Principal Cc: Valerie Gray, P.E., Director, Public Works Mark Van Vleck, P.E., Director, Utilities Temple Williamson, P.E., CFM, Major Projects Engineer, Utilities Carl Crull, P.E., HDR Curtis Beitel, P.E., CFM, HDR 555 N.Carancahua.Suite 1600,Corpus Christi.TX 78401 T 361 696.3300 hdrinc.com