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Home My WebLink AboutC2013-317 - 9/13/2013 - NA CITY OF CORPUS CHRISTI AMENDMENT NO. 6 CONTRACT FOR PROFESSIONAL SERVICES The City of Corpus Christi, Texas hereinafter called "City", and PIPELINE ANALYSIS LLC, agree to the following amendments to the Contract for Engineering Services for Chide Hydraulic Model-Sanitary Sewer Overflow Initiative (SSOI) (Proiect No. E10015), as authorized and administratively amended by: ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Original Contract Au°ust 24, 2010 Motion No. M2010-195 $96„101.00 . Amendment No„ 1 October 11, 2010 Administrative&P-roval $48,548.00 Amendment No. 2 December 4, 2010 Administrative A„ roval $29,176.00– Amendment No. 3 June 21, 2011 Motion No,. M2011-133 $1,989,1 03.00 Amendment No. 4 A��C ril 23,,2013 Motion No. M2013-071 $179µ251.O0 ......... ......... ......— Amendment No. 5 Jul 23, ,Ad,mi,nistrative A $48,990.00 EXHIBIT "A", SECTION 1. SCOPE OF ENGINEERING SERVICES, shall be amended due to the increased level of effort required to field verify and correct discrepancies in the GIS maps and establish lift station control elevations. Specific tasks are described in Amendment No.. 6 Exhibit"A"'. Exhibit"A", SECTION 3. FEES shall be amended and is attached as Amendment No. 6 Exhibit "A" for a revised fee not to exceed $48,130.00 (Forty-Eight Thousand One Hundred Thirty Dollars and Zero Cents), for a total restated fee not to exceed $_2:439,299.00 (Two Million Four Hundred Thirty-Nine Thousand Two Hundred Ninety-Nine Dollars and Zero Cents). Monthly invoices shall be submitted in accordance with the attached Amendment No. 5 Exhibit"B". All other terms and conditions of August 24, 2010 contract between the City and Engineer will remain in full force and effect. CITY OF CORPUS CHRISTI PIPELINE ANALYSIS, LLC 0 L2 " ® 8-ZS- Mark Van Vleck; P.E., a Jame For s, Jr., P.E., Date Interim Assistant City Manager for President Public Works & Utilities 1115 Main Street Garland, Texas 75040 (800)637-0164 Office RECOMMENDED /1A Daniel Biles, .E., Yate Director of Engineering Se 'ices Operating Def#ft m&ht Da e APPRI,VAS FORM 1,40 Leoal Departm Date 2013-317 9113113 AMEND. NO. 6 Pa e 1 of 2 Pipeline Analysis LLC, ME10015 CITYWIDE SS HYDRAULIC MODELUIMENOMENT NO 1ACONTRACT DOC �� r� APPI D Office of Management and Budget Date ATTEST 8:�2-4 Armando Chapa, City Secretary Project No. E10015 AUl"'i 20 2013 Fund Source No. 55095Q-4249-OQOQO-E10Q15 fliljup1V IIInAt I6 KRNAIIHER Fund Name: Wastewater 20128 CIP (Rev Bds) Encumbrance No. AMEND. NO. 6 Pa e2of2 K%ENGINEERING DATAEXCHANGEVENNIFEMWASTEWATERXE1OO15 CITYWIDE SS HYDRAULIC MODELIAMENDMENT NO 6%CONTRACT DOC C P IPELINE ANALYSISUC 1115 Main Street MSTPAOrCRCIOL LFI710NCNGHVEI` S Garland, Texas 75040 800-637-0164 August 19,2013 William J.Green,P.E. Assistant Director of Engineering Engineering Services 1201 Leopard Street Corpus Christi,Texas 78401 RE: Contract Amendment No. 6 (361)826-3598—direct Phase 1 Task 13—GIS (361)816-4916—mobile Project No.E10015 hiiIIZ@cctexas.com Dear Mr. Green, Amendment No.6 to the above referenced contract is necessary due to the increased Ievel of effort required to field verify and correct discrepancies in the GIS maps and establish lift station control elevations. The attached letter from LNV, Inc.,with input from Coym,Rehmet& Gutierrez,L.P., summarize the request and costs. Amendment No.6 totals$48,130 for the Phase 1 service areas(Oso, Greenwood, and Broadway). Based on conversations with CRG and LNV we anticipate additional effort will also be required for the Phase 2 service areas to field verify GIS discrepancies. The major tasks included in the city-wide project scope for this Amendment No.6,Phase l m-Task 13 are: • Modify the GIS data to represent actual field conditions • Using the modeling software,validate the GIS modifications to GIS data including plotting of horizontal profiles and engineering analysis of results. The total amount of this Amendment is $48,130 as shown in the breakdown on Attachment "A". The man hour and fee analysis for this Amendment is shown in Attachment `B". l have also attached the project schedule for the work as shown in Attachment"C". If you have any questions or require additional information, please give me a call at (800) 637-0164 or email me atjforbes@pipelineanalysis.com. Very truly yours, PIPELINE ANALYSIS,LLC ..... ;. Attachment"A„ Attachment`B" Attachment"C" James H. Forbes,Jr.,P.E. Project Manager Amend.No.6 Exhibit"A" Page 1 of 13 µ Attachment A Project No. E10015 Professional Services Contract City of Corpus Christi Sanitary Sewer Overflow Reduction Program Hydraulic Modeling Scope of Services Amendment No. 6 Phase 1 Task 13 — GIS Mapping Revisions August 2013 C P[PELINE ANALYSIS" Wasa r in association With wsmeem Ii II wdiwcts mmamm DONEENSPNOURPSUriam Amend. No.6 Exhibit"A" Page 2 of 13 Attachment A Contract Amendment No.6 Sanitary Sewer Overflow Initiative Plan Development and Capacity, Management, Operation & Maintenance Self-audit (Project No. E10015) Amendment No. 6 City-Wide Sanitary Sewer Hydraulic Model Phase 1 Task 13 GIS Revisions Amd Arad Arad Amd AwA Amd. T 1 Basic Sar aa: et No. 1 ft 2 No.3 No.4 Ffa6 Floe et 1.Preliminary S 17,B78.00 S S $ 17.878.00 2 C SeH-pudltlnterWews $59,553.00 3 $ S 59,553.00 3 C PwRnal and Anal Report S 8, 3.60 S $ S 8,983.00 4�0 550 Pre Final and Fnal Report S 9,907.00 S S $ 8,907.00 5 Greenwood SSd Plan S 21.225.00 S S 21,225.00 6.Broadway SS01 Finn 5 27.323,00 S S 27,523.00 7.Allison,Laguna and Nhltecap SS01 Plan S 299,176.00 $ 29,178.00 a.Ci�VAde Hydraulic Mod*Vng S 1,989103.00 S 1,969,103.00 9.Phase 2 Temporary Flow niturin9 S 179,251.00 S 179.251.00 10.Phase 1,Task 12•Field Wriftations 548,990.00 S 48,990.00 11.Phase 1.Task 13•GIS Re4sions 548.130.00 S 48,130.00 TOblBasicSeNcee S x.161.00 S 4854600 S 29,178.00 13 1„969„103.06 IS 179251.00 548,990.00 1$48,130.00 1 S 2,439299,00 Amend. No.6 Exhibit"A” Page 3 of 13 Attachment A SCOPE OF WORK CITY OF CORPUS CHRISTI,TEXAS SANITARY SEWER OVERFLOW REDUCTION PROGRAM WASTEWATER HYDRAULIC MODELING Amendment No. 6 Phase 1 Task 13 CITY PROJECT E10015 BACKGROUND The approach to the hydraulic modeling of the wastewater collection system is organized around the City's objectives for this project: • Reduction in Sanitary Sewer Overflows • Cost controls and Least Cost Alternatives • Attainment of long-term Infiltration/Inflow solutions • Collection System Capacity Assurance • Regulatory compliance • Customer satisfaction GENERAL INFORMATION A hydraulic wastewater system model will equip the wastewater department with the tool for analyzing system conveyance capacities,bottlenecks,and potential overflow locations. The hydraulic model is critically dependent on the accuracy of maps and physical data associated with each pipeline. During construction of the hydraulic model some GIS data(pipe diameters,invert elevations,lift station control elevations,etc.)appeared to be in error and field verification confirmed some but not all discrepancies. To construct a viable model of the collection system required field verifications for all these discrepancies. This Amendment No.6 provides for a Task 13—Phase 1 GIS map revisions and model update. OBJECTIVES This amendment will address the following objectives: • Based on the site visits and field verification of pipe diameters and manhole connections/inverts,Engineer will modify the GIS data so that it accurately represents the collection system. This includes revising pipe diameters,adding missing manholes, correcting manhole/pipe invert elevations,and ensuring proper connectivity between all manholes and collection lines. • Engineer will assess and validate the above modifications to the GIS data using the modeling software. This includes plotting horizontal profiles of the modified collection lines and using engineering judgment to determine the legitimacy of the revised profile. PROJECT PHASING The Phase l Task 13-GIS map revisions requires immediate implementation. MODEL BENEFITS • Accurate model construction • QA/QC on model attribute data Amend. Na.6 Exhibit"A" Page 4 of 13 BASIC SERVICES—NIA ADDITIONAL SERVICES TASK 13—FIELD VERIFICATION The development of a hydraulic model for the six wastewater service areas ensures consistent assessment of future growth,maintenance and system capital requirements for current and future conditions. Furthermore,hydraulic modeling will provide the project team consultants with pertinent data to assess system impacts to various wet weather events and will further enable the project team to test cost effective repair strategies and alternatives. Modeling will allow the team to conduct a series of"what if' scenarios that will help determine least cost solutions. These various scenarios take into account the City of Corpus Christi maintenance and personnel needs,budget, planned growth, capacity issues and can be used to more accurately design relief and/or replacement lines and optimize system rehabilitation. Task 13—GIS map revision is required to verify the hydraulic model connectivity and address possible discrepancies in pipe diameters,elevations(pipe slopes),pipe and force main layout, lift station control level elevations,and other GIS discrepancies the must be field verified to confirm accuracy. SCHEDULE The ENGINEER'S services shall be performed in a timely manner consistent with sound professional practices. The ENGINEER will complete the work according to the following revised schedule: Phase 1 -Broadway,Greenwood and Oso Service Areas Major Week No. Duration Week ACTIVrrY Tasks Start (Weeks) End 1 1 31 32 Kick-Off Meeting 1 Workshop/Date Collection and Review 1.6 8 20 28 Wastewater Flow Monitoring 2 16 28 44 Model Development 3 28 64 92 Model Calibration 4 8o 30 110 Exisfing System Ana is 5 80 30 110 Future System Analysis 6 80 30 110 Phase 1 Draft Report 7 4 28 32 Manhole Ins ection 8 4 28 32 Topographic Suve 9 1 139 140 Model Purchase/Traini 10 1 139 140 Supplemental/Corylingency 11 1 3 1 4 lTraffic Control Plan 1 139 1 140 1 PHASE 1 COMPLETE Phase 2-Allison La una Madre and Whiteca Service Areas Major Week No. Duration Week ACTNfTY Tasks Start (Weeks) End 1 40 28 68 Kick-Off Meeting 1 Workshop/Data Collection and Review 1.6 60 56 116 Wastewater Flow Monitoring with Extended Metering) 2 64 56 120 Model Development 3 76 52 128 Model Calibration 4 116 16 132 Existing System Analysis 5 88 48 136 Future System Analysis 6 116 24 140 Phase 2 Draft Report 7 36 16 52 Manhole Ins ecfion 8 48 20 68 TODOCIraphic.Suve 9 1 139 140 Model Purchaselrraini 10 1 139 140 S lemental/Conlin e 11 1 32 4 36 Traffic Control Plan 1 139 140 PHASE 2 COMPLETE 12 1 140 1 8 1 148 1 Combine Phase 1 &2 Reports Amend. No.6 Exhibit"A" Page 5 of 13 The time limits set forth in the schedule shall include allowances for reasonable and expected review time by the CITY and approval by authorities having jurisdiction over the PROJECT,and shall not be allowed as cause for delay or adjustments to the schedule. Delays in the design critical path caused by review times by the CITY or a permitting agency exceeding those anticipated by the ENGINEER'S schedule are cause for adjustments in the schedule. Any adjustments made to the agreed upon schedule shall be made in writing and acceptable to both parties. The ENGINEER shall begin work within 10 days of receipt of the executed CONTRACT AMENDMENT and/or written Notice to Proceed. A schedule of completed work, including a bar graph schedule showing the percentage complete of each of the items of the scope of work, will be submitted each month to the CITY. Amend.No. 6 Exhibit'A" Page 6 of 13 Attachment A Compensation Summary Amendment No.6 Phase 1—Oso,Broadway and Greenwood Service Areas Task 13 GIS Validation and Modifications CRG LNV Pipeline Analysis Total 13.1 Modify GIS Data(Manholes and Lines) $10,180.00 $17,394.00 $ - $ 27,574.00 13.2 Validate Modifications and Profiles $13,320.00 $ 7,236.00 $ - $ 20,556.00 $23,500.00 $24,630.00 $ - $ 48,130.00 Amend. No.6 Exhibit"A" Page 7 of 13 Attachment B Amendment No. 6 Manhour and Fee Analysis muuuu u�u�um �umi paig Amend. No.6 Exhibit"A" Page 8 of 13 LNV engineers Solutions Today with a architects I contractors Vision for Tomorrow August 5, 2013 James H. Forbes, Jr., P .E. Pipeline Analysis, LLC 1115 Main Street Garland, Texas 75040 RE: Sanitary Sewer Overflow Initiative Program City Wide Hydraulic Model -Oso, Greenwood & Broadway Service Areas Project No. E10015 Phase I Task 13—GIS Validation & Modifications—Amendment 6 Mr. Forbes: As you are aware, LNV and CRG were recently requested to prepare an amendment to the above referenced contract involving additional services associated with the Phase I Hydraulic Modeling for the Greenwood (CRG), Broadway(CRG), and Oso (LNV) service areas. During the development of the wastewater system hydraulic model,the modeling team identified numerous variances and Inaccuracies In the wastewater line and manhole GIS data provided by the City. As a result, additional efforts have been required to identify,field investigate and correct these issues to ensure the hydraulic model will accurately resemble the actual sanitary sewer collection systems. The following tasks will be performed under this amendment: • Based on the results of the site visits and field verification of pipe diameters and manhole connectionstinverts, Engineer will modify the GIS data so that it represents the actual collection system. This includes revising pipe diameters, adding missing manholes, correcting manhole/pipe invert elevations, and ensuring proper connectivity between all manholes and collection lines. • Engineer will assess and validate the above modifications to the GIS data using the modeling software. This includes plotting horizontal profiles of the modified collection lines and using engineering judgment to determine the legitimacy of the revised profile. Amend. No.6 Exhibit"A" i SWE 3W f MRKIS OWN MCAS 78401 Page 9 of 13 I MX --- ' The table below summarizes the total number of manholes and total length of collection lines in each service area and identifies the approximate number of modified manholes and lines associated with each. SERVICE #OE MODIFIED MANHOLES PHASE LENGTH t k MODIf j PD LIN 5 AREA MANHOLES I t Greenwood 946 88,- 88 T,%,,,,,,,,,,. �382,021............. 45,000,,,,,, �� 12„.,, 58 .98 3% 234,798 1 Broa way ...........................�...................., ............. ............,,,.,.-.......... ..,.......... ........................... Z5,000 1195 ®so -- 2221 173 8% 815,035 75,000 95b TOTALS 3925 359 996 1,431,$54 145,Q00 10% The total amount of this Amendment is shown in the table below and supported in the man-hour analysis breakdowns from each firm„Attachments`A”& °B'. ,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.............................................................................................................................................................................. .......,,,..,,,............................................_.................................................................. LNV, Inc. $24,630 Co,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,11...................................................................................................... .................,.,,............................................................,,,,,,,,,,,..................................................................... ..........................................................................................................,,,,,,,,,,m... ym, Rehmet&Gutierrez Engineering„, L. P. $23,500 ........................................ ............................................................................................................................................................................................-................................................................................................................................................_............................ Task 13 TOTAL $48,130 If you have any questions or if you would Ile to discuss in more detail, please feel free to call me at 361-883-1984. Sin ol an S. Leynecer, P.E. LNV, Inc. /kIl President Enclosure: Attachment A (1 page) Attachment B(1 page) Approved By: Pipeline Analysis, LLC. James H. Forbes, Jr., P.E. —President 1115 Main Street Garland, TX 75040 Amend.No.6 801 NAVMTM I I Exhibit"A”TEXAS 78408 I I Page 10 of 13 . � © - � -6 ° J L � a � � § O w z a ■ $ c � , LU 2 � K - - <�� ° a ■ � . 0 $ Lu OR � & . 2 ■ 0 to w CL uj § @ 0 cm o , § \ ƒI j3 7 ■ � f�■ � � � . . • ■ \i ■ CO) � § � � § � � ■ - kk k $ � R .J . 2 � 2 a ■ & � � § ■ � 2 § ■ ■ > - - q vs a§ ■ mS 'a _ § § ° © - 2 m - 2 o UP 2k - S� § dim � � o � � a © © ° z 2 z r § ■ Bit ■ § I &� « ■ � � / � \ ° £ & _ § i § §R 8A CL § dt § ) j� . � �j � 2 & __ kk R 4c w 1! 9 � 6 0Lu 5 3 22 f k - X U 2 ) � # ■ wui O§ ¢ e8 22 ° z 0 § § § fib § §2ci � K Wm § §§ E aq0 - � ■ un, 2 c m J §g ■ ® e CL _ ■ Z 2 = § ( ■ § .§� j 2 � �U,J k -d � ) 12 � # ■ a % FL 3 2 § ] Attachment Contract Amendment No.6 City-Wide Sanitary Sewer Hydraulic Model Phase 1 -Broadwat.Greenwood and Oso Service Areas Major Week Na Duration Week ACTNRY Tasks Start (Weeks) End 1 1 31 32 Kick-Off Meeting/ Workshop/Data Collection and R®View 1.6 8 20 28 Wastewater Flow Monitoring 2 16 28 44 Modet Develo meat 4 M i li n 4 80 30 110 Existing Systqrn,Agahg!s 5 80 30 110 F uture Sys*mAnahros 11Q Phase 1 Drat Rqp2EJ 7 1 4 28 32 Manhole-Inspection--- 8 4 28 32 To ra is Se 1 139 140 1 Model Purchase/Training 10 1 139 140 Sypplemen!gConfingency 4 Tragc Traffic P n 1 139 140 1 P RASE 1 COMPLETE P - i e Areas Major Week No.. Duration Week ACTiVRY Tasks Start ffggksj End 1 49 21 f& K° k-Qff M22gpg/W n Ind Rg%jew 1.6 60 56 116 Wastewater Flow Mouton with Extended Metering) 2 64 66 120 Model D'eveloRment 3 76 52 128 Model Calibration 4 1 116 16 132 °n rnAnaWs 5 W 48 136 FOzo Snbm AnaWs, 6 116 24 140 Phase 2 Draft Repo 7 36 16 52 Manhole igsoction T i 1 139 140 Model P /Train 10 1 1 139 140 S nt e 11 32 4 Traffic Control Plan 1 1 i4 P kSE 2 CgMPLM F-12-1- 140 8 148 Cornbkrw Phase I&2 Re Amend. No, 6 Exhibit"A" Page 13 of 13 L N C rrN � 0 0 0 0 0 c 0 0 0 0 0 0 If) 0 0 0 0 ° r M r N Q.N O O LO M N EEC t> d Nam av woo° ° ° ° °0 o °OQ © ❑ °O o 0°° O 0 0 LO ° to Fm- H H to to to O .� r 64 � c o o ° ° 0o ° ° © ° ° o 0 0 vt H F- � o o 2 o Lr, uc U') tc) 0 6 T 64 6 IL o0aoo 000 ❑ ❑ ❑ o° n °O ° 0 Ra o 1- LO N E > a5 0 0 Colo 0 o i• a Q G ti 04 1- w 0 0 to o w o N N m m m w d' 0 IV M M 00 N V- T Z � � C U1 fA dSF to fA � O W 04 4) V N O ° M O M m N N O 4R m LO ti W z z d O N O N IO I-- 0 N (D OD IL •� d V z r 4l4 r b4 4l4 r U 4 w ;o � E wow _= a IL 2 °cam o °° o ° N° m m m N o N N O O O O r I- �" r O � � V z r 64 r 64 {!} #f} a .r 00000 000 © ❑ ❑ 0 000 0 00000 o moom0 000 ` 0 0 to to 0 O P P P O 0 0 0 _EN N � 6 N as O V N U N N N 9 1!j U) to V' LL f/l U ' C (!) V u01 O LL us V a C co L 41 a ;5 V O d o m i4 c N ,C 3 O c os Q O c O ca aomUU) ¢ CL = ti0cocn U) ca F- m AMEND. NO. 6 EXHIBIT"B" Pa se 1 of 1 SUPPLIER NtAIRER TO BE ASSIGNED HY rrY-- PURCRASING DIVISION City of CITY OF CORPUS CHRISTI Corpus DISCLOSURE OF INTEREST Chrrsii City of Corpus Christi Ordinance 1711 Z, 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 '`NA". See reverse side for Filing Requirements. Certifications and definitions. COMPANY vAME: Pipeline Analysis,LLC P.O.BOX: STREET ADDRESS: 1115 Main Street CITY: Garland,Texas ZIP: 75040 FIRM l5: I. Corporation ® �o Partnership ❑ 3. Sole Owner El 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 having an "ownership interest"constituting 3%or more of the ownership in the above named"firm: Name Job Title and City Department(if known) N.A. ?. State the names of each""official"of the Ciry of Corpus Christi having an"ownership interest" constituting 3%or more of the ownership in the above named"firm." Name Title N.A. 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." N.A.Name Board,Commission or Committee 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 N.A. FILING REQUIREMENTS If a person who requests official action on a matter knows that the requested action will confer an economic benefit on any City official or employee that is distinguishable from the effect that the action will have on members of the public in general or a substantial segment thereof,you shall disclose that fact in a signed writing to the City official,employee or body that has been requested to act in the matter, unless the interest of the City official or employee in the matter is apparent. The disclosure shall also be made in a signed writing tiled with the City Secretary, [ thics Ordinance Section 2-344(d)] CERTIFICATION 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 ofCorpus Christi,Texas as changes occur. Certifying Person: James H.Forbes,Jr.,P.E. Title: President (Type or Print) Signature of Certifying ' Date: Person: - ~' DEFINITIONS a. "Board member." A member of any board, commission, or committee appointed by the City Council of the City of Corpus Christi,Texas. b. "Economic benefit". An action that is likely to affect an economic interest if it is likely to have an effect on that interest that is distinguishable from its effect on members of the public in general or a substantial segment thereof. e. "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. d. "Firm." Any entity operated for economic gain, whether professional, industrial or commercial, and whether established to produce or deal with a product or service, including but not limited to, entities operated in the farm of sale 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. e. "Official:' The Mayor, members of the City Council_ City Manager, Deputy City Manager, Assistant City Managers, Department and Division Heads, and Municipal Court Judges of the City of Corpus Christi,Texas. f. "Ownership Interest." Legal or equitable interest, whether actually or constructively held, in a fun, including when such interest is held through an agent, trust, estate, or holding entity. `Constructively held" refers to holdings or control established through voting trusts, proxies,or special terms of venture or partnership agreements." g. "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.