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HomeMy WebLinkAboutC2017-137 - 4/14/2017 - NA A..........t AGREEMENT for Professional Services This AGREEMENT is between the City of Corpus Christi, Texas, a Texas home-rule municipal corporation ("CITY"), acting through its duly authorized City Manager or designee("City Engineer”), and ALDEN, a Texas corporation or partnership ("LAB"), acting through its duly authorized representative who is Stuart A. Cain, Ph.D., President,which agree as follows: 1 DECLARATIONS: City desires to engage Lab to provide services in connection with City's project.described as follows Nueces River Raw Water Pump Station(Project No.E110684("PROJECT"). 2 SCOPE OF WORK: Lab shall provide services to the Project in accordance with the accompanying Scope of Services and Fee Schedule attached as Exhibit A and the Terms and Conditions to Agreement attached as Exhibit B 3 FEE: The City agrees to pay the Lab for services provided in accordance with Exhibit"A", Scope of Services and Fee Schedule under this Agreement, a total fee not to exceed $49,600 Monthly invoices will be submitted in accordance with Exhibit C. 4 CITY'S DISCLOSURE OF HAZARDOUS & TOXIC MATERIALS AND CONDITIONS AT THE PROJECT SITE: To the best of the City's knowledge based upon currently available information, the only hazardous or toxic materials, as defined by the laws and regulations of the Federal government the state. and city which exist at the PROJECT SITE are as follows None { 5. OWNERSHIP OF DOCUMENTS: All documents including contract documents (plans and specifications) record drawings, contractor's field data and submittal data will be the sole property of the City and may not be used again by Lab without the express terms written consent of the City Engineer However, Lab may use standard details that are not specific to this Project CITY OF CORPUS CHRISTI ALDEN 3(2o1 i 7 Margie C Rose Date Stuart A Cain, PhD Date City Manager President n �./� '//�/ 30 Shrewsbury Street 2.4 l2 7 Holden, Massachusetts 01520-1843 ��/r (508)829-6000 Office Mark Van Vleck e Assistant Cit Man:g: Al \ ji , :74-7--' //'. .---- Vie H Gray. •.E. 4� ! D.te Ex. tive Directo .f 'ubli W•.rks( APPROVED AS TO LEGAL FORM Aimee Alcorn-Reed } 2017.03.29 17:48:40-05'00' Assistant City Attorney Date Project Number E11068 Accounting Unit 4093-041 Account 550950 Activity E11068-01-4093-EXP Account Category 50950 Fund Name Water 2013 RVBD K tENCitNEE R$NG DAT AEXCHANG£VENNtFER\WATERIE 11088 NUKES RIVER RAW WATER RUMP STAT,ONWt 0EtrCONTRACT OOC RM 1271915 2017-137 4/14/17 Alden INDEXED • { ALDEN - Solving flow problems since 1894 Proposal For Hydraulic Model Study of the Nueces Pump Station No. 1 Proposal — Revision 01 Alden Proposal No. : HYD-16-P-152-R1 Prepared for: City of Corpus Christi March 2017 is '.. *r4 ' '��? .�.�'�•.'>. hEW C^NCF£IE(HAMEL 1M7 FlCATRCV, RAW WATER FROM MACES t 7 RIVER d, - I I Exhibit A Page 1 of 22 ALDEN Research Laboratory, Inc. 508-829-6000/ phone 30 Shrewsbury Street, Holden, Massachusetts 01520-1843 info@aldenlab.com •www.aldenlab.com ALDEN HYD-P-16-152-R1 March 2017 Name/Title Signature/Date Preparer(P) Reviewer(R) Becca Hall Engineer II /41€ Andrew E. Johansson R Director of Hydraulic Modeling Daniel Gessler, PE, PhD, DWRE Vice President [--- Record of Revisions Revision Revision Change Description No. Date Reason for Change 00 10/21/2016 Initial Issue Date 01 03/16/2017 Removed CFD option from proposal the City has selected the physical modeling option Exhibit A ii Page 2 of 22 Proposal: Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 Table of Contents 1.0 Introduction 1 2.0 PHYSICAL MODEL STUDY 4 2.1 Model Similitude 4 2.1.1 Free Surface Flow 4 2.1.2 Similarity of Vortices 4 2.1.3 Model Geometric Scale 6 2.2 Model Description 6 3.0 INSTRUMENTATION AND MEASURING TECHNIQUES 9 3.1 Flow 9 3.2 Flow Pattern Observation 9 3.3 Free Surface and Subsurface Vortices 9 3.4 Swirl at Impeller Location 9 3.5 Pump Suction Velocity Traverse 10 4.0 ACCEPTANCE CRITERIA 11 5.0 PHYSICAL MODEL TEST PLAN 12 5.1 Phase 1- Baseline Tests 12 5.2 Phase 2- Development of Modifications 12 5.3 Phase 3-Final Documentation Testing 13 6.0 MEETINGS AND REPORTS 14 6.1 Report 14 6.2 Meetings 14 7.0 COST AND SCHEDULE 15 8.0 REFERENCES 16 Exhibit A Page 3 of 22 Proposal: Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 List of Tables Table 3-1 Model Scale Ratios for 1:6 Scale Model 6 Table 6-1 Physical Model Simulation Matrix 12 Table 8-1 Cost and Schedule 15 List of Figures Figure 1-1 Proposed Upgrade to Nueces Pump Station #1, Plan View 2 Figure 1-2 Existing and Proposed Pump Station, Plan View 2 Figure 1-3 Proposed Upgrade to Nueces Pump Station #1, Profile View 3 Figure 3-1 Proposed Physical Model Extents 7 Exhibit A iv Page 4 of 22 Proposal: Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 TRANSMITTAL LETTER March 16, 2017 Jeff Edmonds, P.E. Director of Engineering Services City of Corpus Christi 1201 Leopard St. Corpus Christi, Texas 78401 Proposal For Hydraulic Model Study of the Proposed Upgrade of the Nueces Pump Station HYD-P-16-152-R1 Dear Mr. Edmonds, In response to your inquiry concerning physical scale modeling of the proposed upgrade of the Nueces Pump Station, Alden has prepared the following proposal. The objective of the study will be to evaluate the hydraulic performance of the existing bar screen approach channels, the wet well with the proposed geometry revisions, and the upgraded pumps. Modifications to the design will be derived using the model, as necessary, to arrive at a final design. The final design will meet the acceptance criteria recommended by the Hydraulic Institute Standards (HIS) and provide an overall satisfactory hydraulic performance of the pump station. This proposal is based on the original station drawings provided to Alden. Should the final design and/or details deviate significantly from the information provided, additional costs may be required. In your original inquiry on October 13, 2016, you had asked if Alden could prepare a proposal for both physical and/or CFD modeling of the pump station to improve flow patterns approaching the pumps. On March 15, 2017, LAN indicated via an email that you will proceed with the physical model only, and we have revised the proposal to reflect this decision. Based on our present workload, we will be able to initiate the model design within 1 week from authorization, and begin testing within 2 months. Please do not hesitate to contact myself, Andy Johansson or Becca Hall (x6469) with any questions or concerns regarding our proposed approach. We look forward to possibly being of service to you. Sincerely, Dan Gessler, PE, PhD, D.WRE Vice President Exhibit A Page 5 of 22 Proposal: Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-1 6-1 52-R1 March 2017 vi Exhibit A Page 6 of 22 Proposal: Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 1.0 Introduction This proposal is submitted by Alden Research Laboratory, Inc. (Alden)to Lockwood, Andrews, & Newnam, Inc. (LAN) of Houston, TX, in response to their e-mail Request for Proposal dated October 13, 2016 and attachments thereto. The purpose of the request is to conduct a hydraulic model study of the proposed upgraded Nueces Pump Station No. 1 located in the City of Corpus Christi, Texas. The study will include evaluating the hydraulic performance of the bar screen channels, the wet well with the proposed geometry revisions, and the proposed upgraded and relocated pumps. Modifications to the design will be derived using the model, as necessary, to arrive at a final design that provides an overall satisfactory hydraulic performance of the pump station. The existing pumps at the station are at the end of their expected lifespan. The station upgrade is expected to include minor revisions to the wet well walls, new locations for the pumps, as well as four new raw water pumps. At the time of this proposal the exact geometry of the upgraded pump suction has not been finalized. For the purpose of this proposal, Alden has assumed each upgraded pump will have an approximate design capacity of 17,500 gpm and an estimated bell diameter of 3.0 ft. The Nueces Pump Station No. 1 is located adjacent to the Nueces River. The pump station currently consists of two parallel, symmetrical, and discrete screen channels and wet wells. Each screen channel is 42 ft 9 in. long and 11 ft 10.5 in. wide. A fixed bar screen is located at the upstream edge of each channel and a mechanical bar screen is located at the downstream edge of the channel. The screen channel floor is located at El. -4.5 ft. Directly upstream of the mechanical bar screen, the floor slopes down to El. -7.5 ft. The screen channel geometry is not expected to change significantly in the proposed station upgrade. The screen channels each discharge flow into the parallel wet wells, with the screen channel (and flow) skewed toward the center of the station. The proposed pump station upgrade will result in some significant revisions to the existing pump station wet well geometry. In the proposed revised design, each wet well will be 18 ft 7.75 in. long and 19 ft wide. The existing curtain wall at the upstream edge of the wet well will be maintained in the station upgrade. The two upgraded pumps will be relocated in each wet well, 3 ft from the back wall of the station. Additionally, bay walls will likely be installed in between the pumps. Plan and Elevation views of the existing pump station are shown in Figure 1-1 through Figure 1-3, respectively. Exhibit A 1 Page 7 of 22 Proposal Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 N U. 1 4.00' MICE FACE _ Y OF MEI"ELL 1 I r-T--IT—r .---AFI I I I I I I I r j I i_---I a I J L __- , ` JJ = cii,_ _�� L---+ I = J I Q _ 1[ 01- 1 _ L__J --kz_r- - I I I -1-k I 1 I I ---I 1-L---LJ-f --� -r1---1-T-Fb _,J I I I = I I r —I +'-- 1___ r - r rr - / I I I I I I I I.�L_LJ---J-1-L -� III I Figure 1-1 Proposed Upgrade to Nueces Pump Station #1, Plan View IrFpwittensuattgrdmotram -,- / I i .:5.w t 4 1 CZESSM - I 1 1 I 1 1 1 - II :. I I Ic LOWER LEVEL E%1 TING PLAN VIEW �� LOWER LEVEL PROPOSED PLAN VIEW Figure 1-2 Existing and Proposed Pump Station, Plan View Exhibit A 2 Page 8 of 22 Proposal: Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 EA NEN 42 3ECK VALVE r,01 4C'C FT .L E WAIF E T CO, ETE FCR NEA%11,4 L E H F4+R. ;Fi EEh :Hal.`,EL ID ATI r RAW WATER 1 FROM NUECES t i RNER — f Figure 1-3 Proposed Upgrade to Nueces Pump Station #1, Profile View For the purpose of the proposal it is assumed that the water level within the wet well does not exceed El. 6.0 ft. Considering the issues with the existing pump performance and the uneven approach flow to the pumps, a physical hydraulic model study is desired to evaluate the hydraulic performance of the design for various pump operating combinations and water levels, and to derive modifications to arrive at a satisfactory final design that meets Hydraulic Institute Standards (HIS), if needed. 3 Exhibit A Page 9 of 22 Proposal: Nueces PS Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 2.0 PHYSICAL MODEL STUDY The objective of the physical model study will be to evaluate the hydraulic conditions, including any free and subsurface vortex formation, swirl and velocity non-uniformities that may adversely affect the pump performance. The model will also be used to derive modifications, as needed, to provide satisfactory hydraulic performance based on the Hydraulic Institute/American National Standard for Pump Intake Design (ANSI/HI 9.8-2012). 2.1 Model Similitude 2.1.1 Free Surface Flow Models involving a free surface are constructed and operated based on Froude similitude because the flow physics are dominated by gravitational and inertial forces. The Froude number, representing the ratio of inertial to gravitational forces, can be defined for intakes as, u Fr = (1) �gd where u = average axial velocity at the suction entrance g = gravitational acceleration d = suction entrance diameter The Froude number must be equal in the model and prototype therefore, Frm Fr, = Fr (2) P where m, p, and r denote model, prototype, and ratio between model and prototype, respectively. For models involving formation of vortices, it is important to select a reasonably large geometric scale to achieve Reynolds numbers large enough so as to minimize viscous scale effects and to reproduce the flow pattern in the vicinity of the intake (Anwar, 1978). 2.1.2 Similarity of Vortices The fluid motions involving vortex formation in pump sumps have been studied by several investigators. It can be shown by principles of dimensional analysis that the dynamic similarity of fluid motion that could cause vortices at an intake is governed by the following dimensionless parameters: 4 Exhibit A Page 10 of 22 Proposal: Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL • • ALDEN HYD-P-16-152-R1 March 2017 ud u d ud u2d -, �,5,v,and6/p �1�u (3) of which, u =Froude number(F) V gd (4) ud =Reynolds number(Re) v (5) u2 d =Weber number(W) a/p (6) where: u = average axial velocity at the suction nozzle entrance = circulation contributing to vortexing d = diameter of the suction entrance (or 4xHydraulic Radius for non-circular) s = submergence at the suction entrance v = kinematic viscosity of water g = acceleration due to gravity 6 = surface tension of water air interface p = water density The influence of viscous effects is defined by the Reynolds number(Re), and surface tension effects are indicated by the Weber(W) number. If the influence of viscous forces and surface tension on vortex formation is negligible, dynamic similarity is obtained by equating the parameters ud/r, and d/s in model and prototype. A Froude model satisfies this condition, provided the approach flow pattern in the vicinity of the suction entrance,which governs the circulation, r, is properly simulated. Alden has conducted considerable research on scaling free surface and submerged vortices. From a study of horizontal outlets for a depressed sump (Padmanabhan and Hecker, 1984), it was determined that no scale effect on vortex strength, frequency or air withdrawal existed for pipe Reynolds numbers above 7 x 104. A review of all available data on model versus prototype vortex intensity (Hecker, 1981) indicated negligible scale effects for weak vortices and small scale effects for air drawing 5 Exhibit A Page 11 of 22 Proposal: Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 vortices, and that this effect could be overcome by a relatively small increase in model flow rate. The model flow rate should only be increased by an amount such that sufficient Reynolds and Weber numbers result. Excessively increasing the model flow, particularly to prototype velocity, produces highly exaggerated vortices incompatible with prototype observations. A generalized technique to evaluate scale effects of modeling vortices was developed by Alden (Durgin and Hecker, 1978). Daggett and Keulegan (1974) indicated that an inlet Reynolds number of 3 x 104 is sufficient to obtain a good model to prototype correlation of vortices. Anwar (1978), using a radial Reynolds number, indicated that viscous forces become negligible at Reynolds numbers of 3 x 104. The Hydraulic Institute Standards considers the above literature and allowing a safety margin to be conservative, recommends that the model Reynolds numbers (based on bell diameter and velocity) should be above 6 x 104 to minimize any viscous scale effects in a Froude model. Surface tension effects have been shown to be negligible for Weber number, W, greater than 120 (Jain et al, 1978)while the HIS recommends a Weber number of 240 or above. 2.1.3 Model Geometric Scale Based on the above similitude considerations, a geometric scale of approximately 1:6 is proposed which will satisfy the HIS specified minimum Reynolds number and Weber number requirements. With the proposed geometric scale, at the Froude scaled flows corresponding to the design flow per pump of 17,500 gpm, the model Reynolds number and Weber number at the pump inlets (assuming water temperature in model of 60°F or higher)will be approximately 8.0 x 104 and 967, respectively, satisfying the HIS requirements. Hence, no viscous and surface tension scale effects are expected in the model. The length, velocity, flow and time scale in the 1:6 geometric scale model are included in Table 2-1. Table 2-1 Model Scale Ratios for 1:6 Scale Model Scaled Item Length ratio Model with Froude equivalence Similitude Length & Depth Scale, Lr= Lm/ Lp Lr 1 /6 Velocity Scale, Vr = Vm/Vp L1112 1 /2.45 Flow Scale, Or = Qm/Op Lr5i2 1 /88.18 Time Scale, Tr = Tm/Tp Lr12 1 /2.45 2.2 Model Description The physical hydraulic model will be constructed to the selected geometric scale of about 1:6. Some minor adjustments to the above scale may be required to allow use of commercially available pipes. The model will be located in one of the model buildings at the Alden Research Laboratory in Holden, MA (Alden). Taking advantage of symmetry, only one half of the station 6 Exhibit A Page 12 of 22 Proposal. Nueces PS: Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-1 6-1 52-R1 March 2017 needs to be included in the physical model. The model will simulate one screen channel, wet well, and two pumps, as shown in Figure 2-1. 741.Physical Model BoundaryInflow"B" Off � Inflow Q ear _i. 11: Box --; i E E I I t' Inflow "A" On Figure 2-1 Proposed Physical Model Extents The upstream model boundary will be located at the entrance to the screen channel. An inflow box will be located upstream of the modeled screen channel. To adequately simulate the flow patterns entering the screen channel, Alden proposed that the inflow box should be equipped with two inflow lines on the right and left of the inflow box, inflow "A" and inflow "B" to properly simulate the Nueces River flow direction. Inflow "A" will be used to simulate river flow to the western pump train (to Pumps 1 and 2) and inflow"B" will be used simulate river flow to the eastern pump train (to Pumps 3 and 4). Crossflow in the river will not be simulated in the physical model, as the pumps are more than ten diameters downstream of the river. The downstream model boundary will be located just upstream of the pump impeller in each pump. A detailed evaluation of flow conditions shall be performed in the wet well and pump up to approximately the pump bell throat. The pump geometry up to the pump bell throat, as well as any other pertinent geometry which may influence the flow patterns will be modeled. The model will be constructed using steel, plastic coated plywood and/or plastic as needed. Acrylic will be utilized for portions of the wet well walls and pump piping, as needed, to allow for flow visualization. The model will simulate the geometry within the screen channel, wet well, and the suction of each pump in the modeled wet well up to the bell throat, which will then be continued with a 7 Exhibit A Page 13 of 22 Proposal: Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-1 6-1 52-R1 March 2017 straight vertical acrylic pipe to accommodate the velocity traverse ports as well as a swirl meter. No moving parts of the pumps will be simulated, being unnecessary to meet the objectives of the study. A model flow loop will be assembled with a laboratory pump drawing water from a laboratory sump and feeding the water through pipes to the model head box. The inflow will be measured using venturi and/or orifice meters and adjusted using control valves. Steady water levels in the model will be maintained by balancing inflows and outflows through the model. Flows withdrawn (as siphons)for each of the modeled pumps will be directed back to the laboratory sump. Control valves and flow meters will also be provided in the return pipes of each of the modeled pumps. 8 Exhibit A Page 14 of 22 Proposal: Nueces PS: Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 3.0 INSTRUMENTATION AND MEASURING TECHNIQUES 3.1 Flow The inflow to the model and outflow from each of the modeled pumps will be measured using venture and/or orifice plate meters fabricated and installed per ASME guidelines. The accuracy of the flow measurement is estimated at±2%. The differential head from each flow meter will be measured using a standard water manometer or a calibrated differential pressure cell connected to a computer data acquisition system. Control valves will be provided to adjust the inflow and outflows through the simulated pumps. 3.2 Flow Pattern Observation Flow patterns will be documented with the use of dye tracers and/or confetti. Any flow separations, areas of recirculation, and other notable flow features will be noted with photographic and/or video documentation. 3.3 Free Surface and Subsurface Vortices Alden uses the classification of free surface and subsurface vortices as given in the HIS. Type 1 free surface and subsurface vortices are weak swirls, while Types 2 free surface vortices are dimples with no coherent cores. Type 3 free surface vortices and Type 2 subsurface vortices have a coherent core. Type 3 subsurface vortices have a relatively strong core and cause pressures low enough to release air bubbles out of solution. Type 4 free surface vortices are strong enough to pull down debris while Type 5 and 6 free surface vortices draw air, Type 6 being stronger with an air core. Subsurface vortices usually emanate from the boundaries (walls), and may be visible only when dye is injected. Subsurface vortices will be identified by injecting dye on the walls and floor near the intake of each pump. 3.4 Swirl at Impeller Location As an indication of swirl at the impeller of the pumps, the magnitude and direction of swirl will be measured using a swirl meter, positioned approximately four diameters from the pump suction flange location. The location of the swirl meter will be as recommended in the HIS guidelines. The swirl meter consists of a straight-vaned propeller with four vanes mounted on a shaft with low friction bearings. The vanes occupy 75% of the pipe diameter and have a length equal to 0.6 pipe diameters. The revolutions per unit time of the swirl meter are used to calculate a swirl angle, 9, which is indicative of the intensity of swirl. 0 = tan-' end (7) u where: u = axial velocity at the swirl 9 Exhibit A Page 15 of 22 Proposal: Nueces PS Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 d = diameter of the pipe at the swirl meter location n = revolutions/second of the swirl meter Swirl induced by subsurface and surface vortices is generally unsteady and intermittent. Typically, the number of half revolutions and associated direction of rotation of each swirl meter will be obtained over twenty 30-second intervals, covering a period of 10 minutes in the model. From these data, a maximum 30-second average and 10-minute average swirl angle will be obtained. The swirl meter will be provided with a pick-up so that a computer data acquisition system records the rotations. 3.5 Pump Suction Velocity Traverse For a selected test (selected based on the worst swirl and/or vortex activity), velocity traverses will be obtained along four axes using a three holed pitot-static tube. Seven equidistant points along each traverse axes will be selected. A differential pressure cell calibrated at Alden will be used to measure the difference between static and total heads from the Pitot tube. All data will be expressed as normalized data using the average pipe velocity. 10 Exhibit A Page 16 of 22 Proposal: Nueces PS: Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 4.0 ACCEPTANCE CRITERIA Based on Hydraulic Institute Standards (HIS), the following acceptance criteria will be used to evaluate the hydraulic performance (as indicated by the physical model study results)and select a satisfactory final modified design. Parameter Maximum Acceptable Values Free Surface Vortices Type 2 for normal operating conditions Type 3 < 10% of time or for unusual conditions Subsurface Vortices Type 1 for normal operating conditions. Type 2 < 10% of time, or for unusual conditions. Swirl Angles 30-second and 10-minute (model) averages < 5 degrees for normal operating condition. Higher values (up to about 7 degrees) may be allowed, if occurring < 10% of time, or for unusual conditions. Velocity Distribution Time-averaged point velocities, taken at the pump suction flange, within 10% of the cross-sectional area average velocity. All point standard deviations within ±10% of point average. 11 Exhibit A Page 17 of 22 Proposal: Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 5.0 PHYSICAL MODEL TEST PLAN In order to evaluate the pump station hydraulics, the model will be tested for a range of operating conditions. A test matrix will be prepared jointly by Alden and LAN which will include pump combinations with one or two pumps operating (future flows) and corresponding water elevations. For the purpose of this proposal, it is assumed that up to six(6) operating combinations will be tested with a water surface elevation in the distribution channel not to exceed elevation 6 ft. The test conditions proposed by Alden are presented in Table 5-1. Table 5-1 Physical Model Simulation Matrix Simulation # Inflow Pump 1/4 Pump 2/3 1 "A" ON ON 2 "A" ON 3 "A" ON 4 "B" ON ON 5 "B" ON 6 "B" ON Testing will be conducted in 3 phases as described below. 5.1 Phase 1- Baseline Tests During phase 1, the initial designs will be evaluated for up to six tests as per the Test Matrix. Testing will include visual observations of flow pattern and vortex types and their persistence (including video/photographic documentation as needed) and measurement of swirl. Vortex persistence data will be obtained only for vortices with coherent cores, as weaker vortices are acceptable. Considering the time and efforts needed for velocity traverses, it is proposed that velocity traverses will be conducted in Phase 1 only if no unacceptable conditions were observed in terms of vortices and swirl. Otherwise, the velocity traverse will be conducted in Phase 3, after design modifications derived in Phase 2 are included. Velocity traverses will be limited to one pump by selecting the test that showed the highest swirl, noting that non-uniform velocity distribution is likely to be worst at higher swirls. Test data will be evaluated based on the HIS acceptance criteria. As testing progresses, if two or more tests show unacceptable hydraulic performance, Phase 1 testing shall be terminated to move on to Phases 2 and 3. 5.2 Phase 2- Development of Modifications Using one or two tests that showed the worst conditions in terms of vortex severities and swirl, remedial modifications will be derived by testing to bring the objectionable hydraulic conditions to acceptable levels. Modifications may consist of the installation of one or more of the following: baffles, flow distributors or vanes, curtain walls, and fillets and splitters. All 12 Exhibit A Page 18 of 22 Proposal Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 modifications will be discussed with LAN for their practicality for installation, and a final modified design will be developed for further tests under Phase 3. 5.3 Phase 3-Final Documentation Testing Based on test results from Phase 2, a modified design for testing under Phase 3 will be selected. The test matrix for Phase 3 tests and the scope of testing (vortex observations, swirl, and velocity traverse) will be same as Phase 1. Test results will be evaluated based upon the HIS acceptance criteria, and any "fine-tuning" of modifications shall be derived to bring any objectionable flow conditions to acceptable levels for incorporation into the final design of the pump station. Velocity traverses will be conducted at one pump that showed the highest swirl. 13 Exhibit A Page 19 of 22 Proposal: Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 6.0 MEETINGS AND REPORTS 6.1 Report Alden will prepare a final report for the pump station physical modeling effort. As tests progress, preliminary results will be made available. Upon completion of all tests, a final report including a description of the physical model, scaling, instrumentation, test details, results and conclusions will be submitted electronically in draft form for review. The report will include color photographs of the model, typical flow patterns and vortex activity and drawings of recommended modifications. Based on comments, the report will be revised, as needed, and three hard copies and one electronic copy of the report will be submitted. Brief video documenting typical flow patterns and vortices for the initial and final designs will be submitted along with the final report. 6.2 Meetings Teleconference meetings will be organized between Alden and LAN at the conclusion of model testing. If requested by LAN, a one-day demonstration meeting with formal presentation of results can be arranged at Alden for an additional fee. In this meeting LAN and their clients can review the test results, see the physical model, witness its performance, and view video tapes of typical tests. Informal visits during model construction and/or testing are also welcome. 14 Exhibit A Page 20 of 22 Proposal: Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 7.0 COST AND SCHEDULE The fixed-price Cost and Schedule for the proposed study conforming to the scope of work, as presented in this proposal, is given in Table 7-1 and are based on information/drawings available at present. If the final drawings for the study show any major differences, a revision to the costs and schedule may be required. Table 7-1 Cost and Schedule Physical Model Tasks (Weeks) Cost Model Design and Construction 6 29,600 Testing Phase 1: Baseline Tests 0.5 3,000 Phase 2: Development of Modifications 1 9,000 Phase 3: Final Documentation Tests 0.5 3,000 Physical Model Final Report 1 5,000 Physical Model Total 9 49,600 It is assumed that up to two combinations of modifications will be sufficient to arrive at a satisfactory design for each alternative configuration. In the unanticipated event that more modifications need to be tested, additional costs and time will be required. This quote will remain in effect for a period of 90 days from date of issue. The proposed schedule is dependent upon receipt of all required drawings and information with the notice to proceed. The model will be kept intact at no cost for three months from the date of submittal of the draft report. Beyond this time, the model can be kept on payment of monthly rental charges. Based on our current workload, we will be able to initiate the study within 1 week from Notice to Proceed. 15 Exhibit A Page 21 of 22 Proposal Nueces PS:Physical Model Study PROPRIETARY AND CONFIDENTIAL ALDEN HYD-P-16-152-R1 March 2017 8.0 REFERENCES 1. Hydraulic Institute, "American National Standard for Pump Intake Design," 2012. 2. Anwar, H.O., Wellen, J.A., and Amplett, M.B., "Similitude of Free-Surface Vortex at Horizontal Intake," Journal of Hydraulic Research, IAHR, Vol. 16, No. 2, 1978. 3. Daggett, L. and Keulegan, G.H., "Similitude in Free-Surface Vortex Formations," Journal of the Hydraulics Division, ASCE, November, 1974. 4. Durgin, W.W. and Hecker, G.E., "The Modeling of Vortices at Intake Structures," Proceedings, Joint Symposium on Design and Operation of Fluid Machinery, ASCE- IAHR/IAHR-ASME, June, 1978. 5. Hecker, G.E., "Model-Prototype Comparison of Free Surface Vortices," Journal of the Hydraulics Division, ASCE, October, 1981. 6. Padmanabhan, M. and Hecker, G.E., "Scale Effects in Pump Sump Models," ASCE Journal of Hydraulic Engineering, Vol. 110, No. 11, November, 198 16 Exhibit A Page 22 of 22 Proposal: Nueces PS: Physical Model Study PROPRIETARY AND CONFIDENTIAL • EXHIBIT B TERMS AND CONDITIONS TO AGREEMENT ARTICLE 1. SERVICES: Lab will: 1.1 Provide only those services requested by City Engineer that, in the opinion of Lab, lie within the technical or professional areas of expertise of Lab and which Lab is adequately staffed and equipped to perform. 1.2 Perform technical services under the supervision of a licensed professional engineer and in compliance with the basic requirements of the appropriate standards of the American Society for Testing and Materials, where applicable, and other standards designated in writing by the City Engineer. 1.3 Promptly submit formal reports (printed and electronic copies) of tests, inspections and services performed indicating, where applicable, compliance with the Project specifications or other contract documents. Such reports must be complete and factual, citing the tests performed, methods employed, values obtained and parts of the structure of the Project area subjected to any testing. 1.4 Utilize testing equipment which has been calibrated according to applicable standards and, upon request, submit to the City Engineer or designee documentation of such calibration. Secure representative samples of those materials that the City's contractor proposes to use which require testing, together with relevant data concerning such materials including the point of origin and supplier. 1.5 Consider reports to be confidential and distribute reports only to those persons, organizations or agencies specifically designated in writing by the City Engineer. 1.6 Retain records relating to services performed for City for a period of two years following submission of any reports, during which period the records will be made available to the City at all reasonable times. 1.7 Pay salaries, wages, expenses, social security taxes, federal and state unemployment taxes and any other similar payroll taxes relating to the services. ARTICLE 2. CITY RESPONSIBILITIES: City Engineer or designee will: 2.1 Provide Lab with all plans, specifications, addenda, change orders, approved shop drawings and other information for the proper performance of services by Lab. 2.2 Issue authorization in writing giving Lab free access to the Project site and to all shops or yards where materials are prepared or stored. 2.3 Designate in writing those persons or firms which will act as the City's representative with respect to Lab's services to be performed under this Agreement and which must be promptly notified by Lab when it appears that materials tested or inspected are in non-compliance. Only the City Engineer or designee has authority to transmit instructions, receive information and data and/or interpret and define the City's policies and decisions with respect to the Project. Lab acknowledges that certain City representatives may have different types of authority concerning the Project. 2.4 Advise Lab sufficiently in advance of any operations so as to allow for assignment of personnel by Lab for completion of the required services. Such advance notice will be in accordance with that established by mutual agreement of the parties. Testing Agreement T&C Page 1 Rev. 09/29/15 • • 2.5 Direct the Project contractor,either by the Construction Contract or direct written order,to: (a) Stop work at the appropriate times for Lab to perform contracted services; (b) Furnish such labor and all facilities needed by Lab to obtain and handle samples at the Project and to facilitate the specified inspection and tests; (c) Provide and maintain for use of Lab adequate space at the Project for safe storage and proper curing of test specimens that must remain on the Project site prior to, during and up to 60 days after testing. ARTICLE 3. GENERAL CONDITIONS 3.1 Lab, by the performance of services covered hereunder, does not in any way assume, abridge or abrogate any of those duties, responsibilities or authorities with regard to the Project that, by custom or contract, are vested in the Project architects, design engineers or any other design agencies or authorities. 3.2 Lab is not authorized to supervise, alter, relax, enlarge or release any requirement of the Project specifications or other contract documents nor to approve or accept any portion of the work. Lab does not have the right of rejection or the right to stop the work. City Engineer will direct the Project contractor to stop work at appropriate times for Lab to conduct the sampling, testing or inspection of operations covered by the Agreement. ARTICLE 4. FIELD MONITORING AND TESTING 4.1 City and Lab agree that Lab will be on-site to perform inspections for contracted services. The City and Lab also agree that Lab will not assume responsibility for Project contractor's means, methods, techniques, sequences or procedures of construction, and it is understood that the final services provided by Lab will not relieve the Project contractor of its responsibilities for performing the work in accordance with the Project plans and specifications. For the purposes of this Agreement, the word "inspection" is used to mean periodic observation of the work and the conducting of tests by Lab as specified in the Agreement. Continuous monitoring by Lab or its subcontractors does not mean that Lab is approving placement of materials. Inspection is not and should not be construed to be a warranty by Lab to the City or any other party. 4.2 Samples collected or tested by Lab remain the property of the City while in the custody of the Lab. Lab will retain the samples for a period of 60 days following the date of submission of any report related to the sample. Following the retention period, Lab will dispose of non-hazardous samples, and return hazardous, acutely toxic or radioactive samples and samples' containers and residues to City. City agrees to accept such samples and samples'containers. ARTICLE 5. STANDARD OF CARE AND WARRANTY Services performed by Lab will be conducted in a manner consistent with that level of care and skill ordinarily exercised by reputable members of the profession currently practicing under similar conditions in the same locality. No other warranty either expressed or implied is made or intended by the Agreement or any reports. Lab will not be responsible for the interpretation or use by others of data developed by Lab. ARTICLE 6. INDEMNIFICATION Lab shall fully indemnify and hold harmless the City of Corpus Christi and its officials, officers, agents, employees, or other entity, excluding the engineer or architect or that person's agent, employee or subconsultant, over which the City exercises control ("Indemnitee") from and against any and all claims, damages, Testing Agreement T&C Page 2 Rev. 09/29/15 • liabilities or costs, including reasonable attorney fees and court costs, to the extent that the damage is caused by or results from an act of negligence, intentional tort, intellectual property infringement or failure to pay a subcontractor or supplier committed by Lab or its agent, Lab under contract or another entity over which Lab exercises control while in the exercise of rights or performance of the duties under this agreement. This indemnification does not apply to any liability resulting from the negligent acts or omissions of the City or its employees, to the extent of such negligence. Lab shall defend Indemnitee, with counsel satisfactory to the City Attorney, from and against any and all claims, damages, liabilities or costs, including reasonable attorney fees and court costs, if the claim is not based wholly or partly on the negligence of, fault of or breach of contract by Indemnitee. If a claim is based wholly or partly on the negligence of, fault of or breach of contract by Indemnitee, the Lab shall reimburse the City's reasonable attorney's fees in proportion to the Lab's liability. Lab must advise City in writing within 24 hours of any claim or demand against City or Lab known to Lab related to or arising out of Lab's activities under this Agreement. ARTICLE 7. INVOICES AND PAYMENT 7.1 Lab will submit progress invoices to City Engineer monthly and final invoice upon completion of services. Each invoice is due and payable by City within 30 days of receipt and approval to pay by the City Engineer. 7.2 All funding obligations of the City under this Agreement are subject to the appropriation of funds in its annual budget. ARTICLE 8. INSURANCE REQUIREMENTS 8.1 Lab must not commence work under this agreement until all required insurance has been obtained and such insurance has been approved by the City. Lab must not allow any subcontractor to commence work until all similar insurance required of any subcontractor has been obtained. 8.2 Lab must furnish to the Director of Engineering Services with the signed agreement (or amendment) a copy of the Certificate(s) of Insurance (COI)with applicable policy endorsements showing the following minimum coverage by an insurance company(s) acceptable to the City's Risk Manager. The City must be listed as an additional insured on the General Liability and Auto Liability policies, and a waiver of subrogation is required on all applicable policies. Endorsements must be provided with COI. Project name and or number must be listed in Description Box of COI. Testing Agreement T&C Page 3 Rev. 09/29/15 • TYPE OF INSURANCE MINIMUM INSURANCE COVERAGE 30-written day notice of cancellation, required Bodily Injury and Property Damage on all certificates or by applicable policy Per occurrence- aggregate endorsements Commercial General Liability including: $1,000,000 Per Occurrence 1. Commercial Broad Form $2,000,000 Aggregate 2. Premises—Operations 3. Products/Completed Operations 4. Contractual Liability 5. Independent Contractors 6. Personal Injury-Advertising Injury AUTO LIABILITY(including) $500,000 Combined Single Limit 1. Owned 2. Hired and Non-Owned 3. Rented/Leased PROFESSIONAL LIABILITY $1,000,000 Per Claim (Errors and Omissions) (Defense costs must be outside policy limits) If claims made policy, retro date must be prior to inception of agreement, have extended reporting period provisions and identify any limitations regarding who is insured. 8.3 In the event of accidents of any kind related to this agreement, Lab must furnish the City with copies of all reports of any accidents within 10 days of the accident. 8.4 Lab shall obtain and maintain in full force and effect for the duration of this Contract, and any extension hereof, at Lab's sole expense, insurance coverage written on an occurrence basis, by companies authorized and admitted to do business in the State of Texas and with an A.M. Best's rating of no less than A-VII. Lab is required to provide City with renewal Certificates. 8.6 Lab shall be required to submit a copy of the replacement certificate of insurance to City at the address provided below within 10 days of the requested change. Lab shall pay any costs incurred resulting from said changes. All notices under this Article shall be given to City at the following address: City of Corpus Christi Attn: Engineering Services P.O. Box 9277 Corpus Christi,TX 78469-9277 8.7 Lab agrees that with respect to the above required insurance, all insurance policies are to contain or be endorsed to contain the following required provisions: (a) List the City and its officers, officials, employees, volunteers, and elected representatives as additional insured by endorsement, as respects operations, completed operation and activities of, or on behalf of, the named insured performed under contract with the City, with the exception of the professional liability/Errors&Omissions policy; Testing Agreement T&C Page 4 Rev. 09/29/15 (b) Provide for an endorsement that the "other insurance" clause shall not apply to the City of Corpus Christi where the City is an additional insured shown on the policy; and (c) Provide thirty (30) calendar days advance written notice directly to City of any suspension, cancellation, non-renewal or material change in coverage, and not less than ten (10)calendar days advance written notice for nonpayment of premium. 8.8 Within five (5)calendar days of a suspension, cancellation, or non-renewal of coverage, Lab shall provide a replacement Certificate of Insurance and applicable endorsements to City. City shall have the option to suspend Lab's performance should there be a lapse in coverage at any time during this contract. Failure to provide and to maintain the required insurance shall constitute a material breach of this contract. 8.9 In addition to any other remedies the City may have upon Lab's failure to provide and maintain any insurance or policy endorsements to the extent and within the time herein required, the City shall have the right to order Lab to remove the exhibit hereunder, and/or withhold any payment(s) if any, which become due to Lab hereunder until Lab demonstrates compliance with the requirements hereof. 8.10 Nothing herein contained shall be construed as limiting in any way the extent to which Lab may be held responsible for payments of damages to persons or property resulting from Lab's or its subcontractor's performance of the work covered under this agreement. 8.11 It is agreed that Lab's insurance shall be deemed primary and non-contributory with respect to any insurance or self-insurance carried by the City of Corpus Christi for liability arising out of operations under this agreement. 8.12 It is understood and agreed that the insurance required is in addition to and separate from any other obligation contained in this agreement. ARTICLE 9. TERMINATION OF AGREEMENT The City may, at any time, with or without cause, terminate this Agreement upon seven days written notice to Lab at the address of record. Lab will be compensated for services performed up to termination. ARTICLE 10. CONTROLLING LAW This Agreement is governed by the laws of the State of Texas without regard to its conflicts of laws. Venue for legal proceedings lie exclusively in Nueces County, Texas. ARTICLE 11. DISCLOSURE OF INTERESTS 11.1 Lab agrees to comply with City of Corpus Christi Ordinance No. 17112 and complete the Disclosure of Interests form as part of this Agreement, if required. 11.2 Lab agrees to comply with section 2252.908 of the Texas Government Code and complete Form 1295 Certificate of Interested Parties as part of this Agreement, if required. For more information, please review the information on the Texas Ethics Commission website at https://www.ethics.state.tx.us. 11.3 Lab agrees to comply with Chapter 176 of the Texas Local Government Code and file Form CIQ with the City of Corpus Christi City Secretary's Office, if required. For more information and to determine if you need to file a Form CIQ, please review the information on the City Secretary's website at http://www.cctexas.com/government/city-secretary/conflict-disclosure/index. Testing Agreement T&C Page 5 Rev. 09/29/15 r . , t ARTICLE 12. CLAIMS 12.1 Claims arising from this Agreement shall be made in writing, sworn to and signed by an authorized representative. The responsibility to substantiate a claim rests with the party making the claim. 12.2 All negotiations pursuant to this Article are confidential and shall be treated as compromise and settlement negotiations for purposes of applicable rules of evidence. ARTICLE 13. EXTENT OF AGREEMENT 13.1 This Agreement, including Exhibit "A" and these Terms and Conditions, represents the entire Agreement between City and Lab and supersedes all prior negotiation, representations or agreements,written or oral.This Agreement may be amended only by a written instrument signed by duly authorized representatives of City and Lab. If any conflict occurs between these Terms and Conditions and any other part of this Agreement,these Terms and Conditions are controlling. 13.2 In the event that any one or more of the provisions contained in this Agreement are for any reason held invalid, illegal or unenforceable in any respect, the remaining terms will be in full effect and this Agreement will be construed as if the invalid or unenforceable matters were never included in this Agreement. No waiver of any default will be a waiver of any future default. 13.3 Neither party will assign this Agreement without the express written approval of the other, but Lab may subcontract laboratory procedures as Lab deems necessary to meet the obligations of this Agreement. ARTICLE 14. SAFETY City and Lab agree that, in accordance with the generally accepted construction practice, the Project's general contractor will be solely and completely responsible for working conditions on the Project, including safety of all persons and property during the performance of the work and for compliance with all municipal, state and federal laws, rules and regulations, including OSHA. The duty of Lab in providing services is not, therefore, to include any review of, or responsibility for, the adequacy of the Project's general contractor's safety measures in, on or near the Project site. Testing Agreement T&C Page 6 Rev. 09/29/15 Basic Services: Preliminary Phase Design Phase Bid Phase Construction Phase Subtotal Basic Services Additional Services: Permitting Warranty Phase Inspection Platting Survey O & M Manuals SCADA Subtotal Additional Services Summary of Fees: Basic Services Fees Additional Services Fees Total of Fees COMPLETE PROJECT NAME Project No. XXXX Invoice No. 12345 Invoice Date 01/01/2017 Sample form for: Payment Request AE Contract Revised 02/01/17 Total Current Previous Total Remaining Percent Contract Amd No. 1 Amd No. 2 Contract $1,000.00 $0.00 $0.00 $1,000.00 $2,000.00 $1,000.00 $0.00 $3,000.00 $500.00 $0.00 $250.00 $750.00 $2,500.00 $0.00 $1,000.00 $3,500.00 $6,000.00 $1,000.00 $1,250.00 $8,250.00 $0.00 $2,000.00 $0.00 $0.00 $2,000.00 $0.00 $1,120.00 $0.00 $1,120.00 $0.00 $0.00 $1,627.00 $1,627.00 TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD $2,000.00 $1,120.00 $1,627.00 $4,747.00 $6,000.00 $1,000.00 $1,250.00 $8,250.00 $2,000.00 $1,120.00 $1,627.00 $4,747.00 $8,000.00 $2,120.00 $2,877.00 $12,997.00 Invoice Invoice Invoice $0.00 $1,000.00 $1,000.00 $1,000.00 $ 500.00 $1,500.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,000.00 $1,500.00 $2,500.00 0.0% $500.00 $0.00 $500.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 TBD TBD TBD TBD TBD TBD TBD TBD TBD $500.00 $0.00 $500.00 $1,000.00 $1,500.00 $2,500.00 $500.00 $0.00 $500.00 $1,500.00 $1,500.00 $3,000.00 Notes: If needed, update this sample form based on the contract requirements. If applicable, refer to the contract for information on what to include with time and materials (T&M). Balance Complete $0.00 100.0% $1,500.00 50.0% $750.00 0.0% $3,500.00 0.0% $5,750.00 30.3% $1,500.00 25.0% $1,120.00 0.0% $1,627.00 0.0% TBD TBD TBD TBD TBD TBD $4,247.00 10.5% $5,750.00 30.3% $4,247.00 10.5% $9,997.00 23.1% EXHIBIT "C" Page 1 of 1