14
BERKELEY COUNTY WATER & SANITATION PROJECT SOTER ADDENDUM #3A - AMENDMENT ADDENDUM# --------'0-0~3 _____ _ ADDENDUM TO CONTRACT NO. _ ____,0~0 ....... 1 __ _ PROJECT: Project Soter at the Camp Hall Site - Professional Engineering Services for Berkeley County Water & Sanitation Infrastructure Berkeley County Water & Sanitation (Owner) and Thomas & Hutton Engineering Co. (Consultant or Thomas & Hutton) this day of , 2015, amend their contract dated May 27th. 2015 for work, materials, or services described below. SCOPE OF WORK: Thomas & Hutton is proposing to amend Addendum #3 to reflect the change in scope from the Dorchester County Reach water option to the Cooper Store Reach option. This amendment proposes to terminate Phase A - Items 1-4 for Civil Design & Permitting - Distribution Mains. as well as to terminate Phase B - Items 1-3 for Construction Services - Distribution Mains from the existing Addendum #3. All other work involving the elevated storage tank in the existing Addendum #3 will remain as services to be provided. This amendment proposed to replace the aforementioned professional services with the proposed professional services included herein to provide necessary design, permitting and construction administration of the Cooper Store Reach water option in lieu of the Dorchester County Reach option. This option includes design, permitting and construction administration of approximately 22,500 LF of 20-inch water line, 26,000 LF of 16-inch water line, one booster pump station, one flow control station and all necessary appurtenances necessary to serve Project Soter with potable water via the Cooper Store Reach. The proposed water line extension will extend service from existing Cooper Store tank to the proposed tank at Camp Hall along Highway 17 6 and Centerline Road. Also included in this project will be a new booster pump station located at the Cooper Store Tank site as well as a new flow control station near Brighton Parkway. A. Civil Design and Permitting 1. sews Water Design After completion of Survey Phase and Owner approval of the Basis of Design Report, the Consultant shall prepare off-site water infrastructure plans. Reference Exhibit 1. dated October 29. 2015. These plans shall be submitted to the Owner for review. The water plans will include: Approximately 22,500 LF of 20- inch water line, 26,000 LF of 16-inch water line, one booster pump station, one pump station building, one flow control station and building and all necessary appurtenances necessary to extend 1 of8

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Page 1: Soter - Addendum 3a (BCWS) - Granicus

BERKELEY COUNTY WATER & SANITATION

PROJECT SOTER

ADDENDUM #3A - AMENDMENT

ADDENDUM# --------'0-0~3 _____ _

ADDENDUM TO CONTRACT NO. _ ____,0~0 ....... 1 __ _ DATE~~~~~~~~~~~~~~

PROJECT: Project Soter at the Camp Hall Site - Professional Engineering Services for Berkeley County Water & Sanitation Infrastructure

Berkeley County Water & Sanitation (Owner) and Thomas & Hutton Engineering Co. (Consultant or Thomas & Hutton) this day of , 2015, amend their contract dated May 27th. 2015 for work, materials, or services described below.

SCOPE OF WORK:

Thomas & Hutton is proposing to amend Addendum #3 to reflect the change in scope from the Dorchester County Reach water option to the Cooper Store Reach option. This amendment proposes to terminate Phase A - Items 1-4 for Civil Design & Permitting - Distribution Mains. as well as to terminate Phase B - Items 1-3 for Construction Services - Distribution Mains from the existing Addendum #3. All other work involving the elevated storage tank in the existing Addendum #3 will remain as services to be provided. This amendment proposed to replace the aforementioned professional services with the proposed professional services included herein to provide necessary design, permitting and construction administration of the Cooper Store Reach water option in lieu of the Dorchester County Reach option. This option includes design, permitting and construction administration of approximately 22,500 LF of 20-inch water line, 26,000 LF of 16-inch water line, one booster pump station, one flow control station and all necessary appurtenances necessary to serve Project Soter with potable water via the Cooper Store Reach. The proposed water line extension will extend service from existing Cooper Store tank to the proposed tank at Camp Hall along Highway 17 6 and Centerline Road. Also included in this project will be a new booster pump station located at the Cooper Store Tank site as well as a new flow control station near Brighton Parkway.

A. Civil Design and Permitting

1. sews Water Design

After completion of Survey Phase and Owner approval of the Basis of Design Report, the Consultant shall prepare off-site water infrastructure plans. Reference Exhibit 1. dated October 29. 2015. These plans shall be submitted to the Owner for review. The water plans will include:

• Approximately 22,500 LF of 20-inch water line, 26,000 LF of 16-inch water line, one booster pump station, one pump station building, one flow control station and building and all necessary appurtenances necessary to extend

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Page 2: Soter - Addendum 3a (BCWS) - Granicus

THOMAS & HUTTON ENGINEERING Co. AND BERKELEY COUNTY

ADDENDUM NO. 003A

service from the Cooper Store elevated tank to the proposed elevated storage tank. The lines are to be owned and operated by BCWS.

• Erosion Control - for water system construction. • Profiles - water (drainage is not included). • Construction Details - water and erosion control. • Quantity Takeoff and Opinion of Probable Construction Cost for water. • Technical specifications for water mains construction. • All design calculations for water main sizing, pump sizing/selection,

elevated tank overflow elevation and storage volume, surge analysis, water hammer, and all other hydraulic system modeling for the project shall be performed by Brown and Caldwell. Thomas & Hutton will coordinate with Brown and Caldwell on alignment of proposed mains, location of booster station, master meter/control valve station, and proposed elevated tank within Camp Hall. Brown and Caldwell scope for these activities can be reviewed as Appendix A to this amendment.

• BCWS will be responsible for any property acquisition necessary to facilitate design, prior to construction.

2. Hydraulic Modeling and Surge Analysis

Consultant will retain the services of Brown and Caldwell to perform hydraulic modeling and a surge analysis for the project. Brown and Caldwell will also provide the conceptual design and design consideration report for water main sizing, pump sizing/selection, master meter/control valve configuration and design, as well as surge suppression considerations. Appendix A includes the detailed scope for Brown and Caldwell's services. Consultant will provide coordination assistance between Owner and Brown and Caldwell.

3. Water Booster Station Plans and Specifications

After completion of Survey Phase the Consultant will provide design services to develop construction plans and technical specifications for the proposed Water Booster Station. The building design shall be based on housing two (2) high service booster pumps, piping, and SCADA equipment as well as electrical equipment and appurtenances. These plans and Specification shall be submitted to the Owner for review. Our design services will include the following:

• Construction plans and specifications for water booster station within the proposed site to include structural design/detail drawings of floor, foundation, framing, elevations, building sections, wall sections, door schedules, finish schedules, and other details needed for construction. Plan layout and details of pumps, backflow preventers, fittings, and related appurtenances within the building. The meter station will also include supervisory control and data acquisition (SCADA) system for control and monitoring purposes. Booster pump station and controls shall be design based on standard Berkley County Water & Sanitation requirements.

• Based upon direction from the Owner, Thomas & Hutton Engineering Co. will coordinate with our Mechanical, Electrical, and Plumbing (MEP) Consultant, to provide electrical and mechanical design for the proposed booster station. Our MEP Consultant shall aid us in the preparation of construction documents including detail drawings, technical

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Page 3: Soter - Addendum 3a (BCWS) - Granicus

THOMAS & HurrON ENGINEERING Co. AND BERKELEY COUNTY

ADDENDUM No. 003A

specifications, contract documents, and opinion of probable construction cost for electrical equipment and components for the proposed station.

• Our design services are based on the following assumptions for the proposed facility:

The station will have two (2) pumps, each capable of pumping approximately 1 ,000 gpm (size to be verified by Brown & Caldwell as part of their scope of services) with provisions for a third pump in the future.

The pumps may be equipped with variable frequency drive units.

The mechanical layout will include yard piping, suction and discharge piping, valves, fittings, and one flow meter to measure total station flows.

Controls will be PLC-based (up to 25 1/0 points) and designed to communicate with Santee Cooper's SCADA system to provide remote monitoring of the pumps.

The pump building will be a masonry CMU type structure with standing seam metal roofing. A brick veneer can be added to the building if requested by the Owner. Furthermore, Consultant can prepare a performance type specification for a package-type enclosure, designed by pump vendor and not requiring architected drawings, if requested by BCWS.

Site will have f ea tu res and landscaping that meet Local Development Codes. The pump station will be located in Berkeley County.

Power supply for pumping station will be 480 volt 3 phase from transformer provided and installed by Berkeley Electric Cooperative.

Station will include a dedicated stand-by diesel engine driven 480 volt 3 phase power generation system for the pump station.

Owner will provide all available record drawings showing existing underground utilities within the project area, which will be incorporated into the construction drawings. Thomas & Hutton's services do not include independent field verification or investigation to determine the location of any underground utilities.

• Erosion Control - for the Water Booster Station site

• Quantity Take-off and Opinion of Probable Construction Cost for proposed Water Booster Station

• Technical specifications for clearing, earthwork, site preparation, water distribution system, and erosion control.

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Page 4: Soter - Addendum 3a (BCWS) - Granicus

THOMAS & HUTTON ENGINEERING Co. AND BERKELEY COUNTY

ADDENDUM No. 003A

4. Master Meter/Control Valve Station Plans and Specifications

In order to serve the new industry a new master meter/control valve station is needed to serve the BCWS's potable water system. This master meter will connect to Santee Cooper's 30-inch water transmission main near the intersection of Rose Drive and Brighton Park Boulevard. The new control valve/master meter station will be constructed either in SCOOT right-of-way or on a parcel that will be acquired by the BCWS. If the BCWS chooses to acquire a parcel, T&H will be provided a plat of the parcel on which the control valve/master meter station is to be designed.

After completion of Survey Phase the Consultant will provide design services to develop construction plans and technical specifications for the proposed Water Control Valve Station. The vault design shall be based on housing control valves, master meters, fittings, piping, and SCADA equipment as well as electrical equipment and appurtenances. These plans and Specification shall be submitted to the Owner for review. Our design services will include the following:

• Construction plans and specifications for the Master Meter/Control Valve Station within the proposed site to include structural design/detail drawings and site plans of the meter/control vault, and other details needed for construction. Plan layout and details of control valves, meters, backflow preventers, fittings, and related appurtenances within the vault. The meter station will also include supervisory control and data acquisition (SCADA) system for control and monitoring purposes. Master meter, control valves, and controls shall be design based on standard Berkley County Water & Sanitation requirements.

• Based upon direction from the Owner, Thomas & Hutton Engineering Co. will coordinate with our Mechanical. Electrical, and Plumbing (MEPJ Consultant. to provide electrical and mechanical design for the proposed booster station. Our MEP Consultant shall aid us in the preparation of construction documents including detail drawings, technical specifications, contract documents, and opinion of probable construction cost for electrical equipment and components for the proposed station.

• Our design services are based on the following are assumptions for the master meter/control valve station:

The station will include 12-inch and 16-inch flow control valves with electric actuators (size to be verified by Brown and Caldwell, see Appendix A).

The mechanical layout will include yard piping, two (2) flow control valves with electric actuators, fittings, two (2) flow meter to measure total flows.

Controls will be PLC-based (up to 25 1/0 points) and designed to communicate with Santee Cooper's SCADA system to provide remote monitoring of the pumps.

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Page 5: Soter - Addendum 3a (BCWS) - Granicus

THOMAS & HUTTON ENGINEERING Co. AND BERKELEY COUNTY

ADDENDUM No. 003A

5. Permitting

Site will have features and landscaping that meet Local Development Codes. The master meter/control valve vault will be located in Berkeley County.

Power supply for building will be 480 volt 3 phase from transformer provided and installed by Berkeley Electric Cooperative.

Station will include a dedicated stand-by diesel engine driven 480 volt 3 phase power generation system to power lights, SCADA, and instrumentation within building in the event of main power loss.

Owner will provide all available record drawings showing existing underground utilities within the project area, which will be incorporated into the construction drawings. Thomas & Hutton's services do not include independent field verification or investigation to determine the location of any underground utilities.

Consultant shall assist Owner with the preparation of submittal packages for the construction of the planned water main extensions. The payment of fees associated with the application process is the responsibility of the Owner. Consultant shall submit final plans and specifications to the applicable local, state, and federal agencies for review. Agency submittals anticipated for this project include:

• SCOOT Permit

• SCDHEC - OCRM - Coastal Zone Consistency

• Berkeley County - Land Disturbance

• SCDHEC Construction Permit

• USACE Nationwide Permit for Construction

• Berkeley County Building Permit

Submittal fees are not included in our fee schedule and shall be provided by the Owner at the time of submittal. Consultant will assist Owner in obtaining construction permits for the project. This phase includes revising plans and specifications according to agency comments and if requested, meeting with the agencies on behalf of the Owner.

8. Construction Services

1. Bidding and Award

Consultant shall assist Owner during the Bid Phase. The service shall be provided on a Lump Sum basis. Typical services provided during this phase include preparation of contract documents, assembling bid packages, attending or conducting pre-bid meetings, responding to contractor questions, and preparation of the Consultant's recommendation letter for award of bid.

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Page 6: Soter - Addendum 3a (BCWS) - Granicus

THOMAS & HUTTON ENGINEERING Co. AND BERKELEY COUNTY ADDENDUM No. 003A

2. Construction Administration

During the course of construction, the Consultant will provide the following services:

• Review material data, shop drawings, and construction schedules provided by the Contractor.

• Provide construction observation and monitoring to ascertain that the work is in substantial conformance with the contract documents and with the design intent.

• Review record drawings provided by Contractor.

• Request project acceptance by applicable agencies.

3. Construction Observation

During the course of construction, the Consultant will provide the following services:

• Attend final field inspections by regulating agencies for the project.

• Construction Observation

Construction observation and monitoring does not include exhaustive or continuous on-site inspections to check the quality or quantity of the Contractor's work. However, it does include visits to the project site at intervals appropriate to the various stages of construction to review general compliance with approved plans and specifications. Construction Observation Services are based on a 12 month period from BCWS issued Notice to Proceed. Construction Observation Services under this agreement include up to a budgeted one hundred and sixty ( 160) hours per month of observation services for the water main extensions, and forty (40) hours per month of construction administration services. Such visits and observations shall not require Consultant to assume responsibilities for the means and methods of construction, nor for safety measures or conditions on the job site. Both parties understand that the Contractor has notification requirements at specific intervals of the construction process. Consultant does not provide accessibility construction compliance verification. This service can be provided at the request of the Owner with specific scopes and fees.

Should the construction time extend beyond the 12-month period or should the Owner request additional observation beyond the budgeted one hundred and sixty (160) hours per month or the budgeted forty (40) hours per month of construction administration services. Engineer shall provide these additional services on a time and expense basis following written authorization from Owner.

The Consultant provides construction services as defined above for the work designed by the Consultant. Other construction work that may occur on site is the responsibility of other design professionals or the Owner and expressly not the responsibility of the Consultant.

a. Record Drawing Preparation

Consultant shall prepare record drawings based on information supplied by the Contractor. The Contractor will provide a survey regarding the constructed facilities. The survey provided by Contractor shall be certified

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Page 7: Soter - Addendum 3a (BCWS) - Granicus

THOMAS & HUTTON ENGINEERING Co. AND BERKELEY COUNTY

ADDENDUM No. 003A

C. Exclusions

by a registered surveyor licensed in the state in which the work is performed, if required by the governing agency. The scope does not include field work on the part of the Consultant. The information will be compiled in an AutoCAD format by the Contractor and submitted to the Consultant. The Consultant will review this information to ensure that the information submitted meets the intended design. The Consultant shall not verify or certify that the information submitted by the Contractor or Contractor Representative is correct. The Consultant will submit this information to the reviewing agency. The record drawings will meet the requirements of the Berkley County Water & Sanitation record drawing specifications at the time this contract is executed. In addition, the Record Drawings will include:

• Water Booster and Valve Station building & vault corners, fencing, above ground site components, water valve manholes, boxes, fire hydrants, and other above ground water system appurtenances

• The scope does not include the location or depth of any power, telephone, cable television, or natural gas lines.

• The record drawing will be compiled from field information collected during the survey phase, water main, fitting, and structure locations as determined by the Contractor's Record Survey, Contractor's as-built red line markups/notes, and observations made by Consultant. Depth of top of pipe within structures shall be collected by the Contractor as part of his record survey and as-built depth of water main, in general, along the alignment will be based on Contractor's as-built drawing red line markups and field notes. The data will be presented in a format for the reviewing agency's review.

• Additional information required by the reviewing agency beyond what is reasonable and customary for record drawings, shall be billed as additional services. Examples are as follows:

Geodetic coordinates for structures, fittings, or pipes

Profiles for sanitary sewer, water, or storm drainage

Roadway profiles

Testing locations for roadway on the plan view

Items not included in the scope of services are as follows:

• On-Site water & sewer design • Archaeological survey and report • Hydraulic modeling, water main s1z1ng, pump sizing/selection, control valve

configuration/design, and elevated water storage tank overflow elevation determination. These services to be provided by Brown and Caldwell (see Appendix A)

• Phase One or Phase Two Environmental Assessments • Endangered species survey and report

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Page 8: Soter - Addendum 3a (BCWS) - Granicus

THOMAS & HUTTON ENGINEERING Co. AND BERKELEY COUNTY

ADDENDUM No. 003A

• Off-site work unless specifically covered in the scope of services • Approvals or permits other than those related to the scope of work covered by this

contract • Traffic control design or measures • As-built or Record Survey (performed by Contractor) • Act as an expert witness for legal activities • Submittal or permit fees • Telephones. cable television, gas, and power distribution systems

These items can be coordinated or provided, if requested by the Owner in writing.

We propose that payment for our services will be as follows:

Phase Fee Structure Fee or Time & Expense Budget

A. Civil Design & Permitting - Distribution Mains - Cooper Store to Camp Hall

l. BCWS Water Design & Permitting: 2. Hydraulic Modeling & Surge Analysis (B&C) : 3. Structural (Booster & FC Stations) 4. Electrical/HY AC/Mechanical 5. Landscape Plan (FC Station) 6. Topographic Survey: 7. Wetlands Permitting: 8. Easement/Platting

Lump Sum Lump Sum Lump Sum Lump Sum Lump Sum Lump Sum Lump Sum Lump Sum

$ $ $ $ $ $ $ $

345,000.00 85,000.00 25,000.00 25,000.00 5,000.00

45,000.00 35,000.00 25,000.00

B. Construction Services- Distribution Mains- Cooper Store to Camp Hall

l. Bidding & Award $ 20,000.00 2. Construction Administration/Observation:

Lump Sum Lump Sum Lump Sum

$ 289,500.00 3. Permit to Operate/Record Drawings: $ 15,000.00

BERKELEY COUNTY WATER & SANITATION

By: _____________ _

Title:._...,S-=e""'n""'io~r~V~ic=e="-'P""'re=s=id=e=n~t~/C=,..;O~O~-- Title: ______________ _

Date:_ ......,,\ \-+-'}S=-o- ~___,2-_____ o .._,/ ~s __ _ f I

Date: ______________ _

Bv: ~w. C ~ John Culbreath, P.E.

Title: Regional Director

Date: ll/30/201 5

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Page 9: Soter - Addendum 3a (BCWS) - Granicus

Exhibit A Page 1 of 5

Exhibit A

Scope of Services

Cooper Store Reach

Thomas & Hutton

Berkeley County Water & Sanitation PROJECT BACKGROUND AND PURPOSE Thomas & Hutton (T&H) has been hired by the Berkeley County Water & Sanitation (BCWS) to design approximately 18 miles of large diameter (20" and 16") water main to serve the recently announced Volvo industry, which is locating in Berkeley County. The project also includes the design of a 0.75M gallon elevated water tank, a new control valve/master meter station to the Lake Moultrie Regional Water System (LMRWS), and a booster pump station. The project has a fast design and delivery schedule with completion of construction set for May of 2017. In order to aide with the accelerated schedule (and at the request of BCWS), Thomas and Hutton has requested the help of Brown & Caldwell (BC) to perform hydraulic modeling tasks, the design of the booster pump station located at Santee Cooper’s hydropillar tank, and the new master meter/control valve station. In general, the scope of services to be provided by BC shall be as follows:

Hydraulic Modeling and Surge Analysis BC will work as a sub-consultant to Thomas and Hutton (T&H) to perform a detailed modeling analysis and conceptual design of the infrastructure needed to convey water from the Lake Moultrie Regional Water System (LMRWS) to Camp Hall (Volvo) through the Cooper Store reach. BC will summarize the study findings with Preliminary Engineering Report. The following will be conducted under this task: Subtask 1.1 – Model Calibration Refinement Subtask 1.2 – Dynamic and Surge Modeling Analysis Subtask 1.3 – Conceptual Design Subtask 1.4 – Report Preparation

Subtask 1.1. Model Calibration Refinement

Linking SCADA Data Flat File to Model BC will utilize a new feature in the Innovyze InfoWater modeling software to link the model directly with a flat file export from the Santee Cooper SCADA historian, which contains data for all of Santee Cooper’s and BCWS’s water facilities including elevated tanks, master meter/control valve stations, and pumping stations. BC will request that Santee Cooper provide the flat file with at least 6 months of data similar to a request made during the BCWS water system master plan study. The

Page 10: Soter - Addendum 3a (BCWS) - Granicus

Exhibit A Page 2 of 5

InfoWater modeling software connection to the flat file will enable rapid model vs. SCADA comparison (a feature which was not available during the recent master plan study) to refine the model calibration accuracy to achieve better confidence in the modeling analysis results for this study. This task will also provide an opportunity to adjust the model master meter/control valve operation to reflect the rent changes made by Santee Cooper Operations as part of the Operations Plan Report prepared by BC during the BCWS water system master plan study.

Detailed Model Calibration BC will pick 2-3 separate 72-hour time periods to perform the extended period simulation (EPS) model calibration and will compare SCADA vs. model results using the new InfoWater Gap Analysis tool. The new InfoWater model tools will enable rapid import of SCADA boundary conditions and calculation of zone diurnal demands. BC will make adjustments to model C-factors, master/meter control valve settings, and elevated tank altitude valve control logic to achieve 10% accuracy of model flows, levels, and pressures vs. the SCADA data.

Subtask 1.2. Dynamic and Surge Modeling Analysis

Define Model Demand Assumptions and Scenarios BC will work with T&H and BCWS to define specific model runs and demand assumptions based on the previously chosen Cooper Store Reach alignment. The modeling work will be conducted in batches or in total based on discussion with BCWS. Assumption: BC anticipates setting up approximately 8 dynamic model scenarios to perform the extended period simulations (EPS) and 3 surge model scenarios as described below.

Perform EPS Modeling of Volvo Phase 1 Demands – Year 2017 BC will conduct extended period simulation (EPS) modeling analysis using the BCWS network model to analyze the LMRWS’s supply to Camp Hall at Volvo Phase 1 demands, estimated 2017 demands in the BCWS system, and estimated 2017 Summerville/Goose Creek demands (if information is available). Year 2017 annual average day demand (ADD), maximum day demand (MDD), and MDD plus fire flow (MDD+FF) scenarios will be analyzed. BC will determine the maximum safe available domestic and fire flow for Volvo at Phase 1 demands with the proposed pipelines shown in Attachment A. BC will also analyze a scenario without Nexton pipeline completion to determine the available domestic and fire flow at Volvo. BC will also evaluate at least one pipe break scenario to inform BCWS and T&H in the design process.

Perform EPS Modeling of Volvo Phase 2 Demands – Year 2019 BC will determine the maximum safe available domestic and fire flow for Volvo at Phase 2 demands based on the proposed pipelines shown in Exhibit A. In the event the proposed Volvo demand projections are too high to be supplied by only the Cooper Store Reach, BC may model the combination of Lake Moultrie and Lake Marion supply to Camp Hall (pipelines are already in the BCWS model).

Perform EPS Modeling of 20-Year BCWS Horizon Demands – Year 2033 BC will confirm the sizing of final selected pipeline diameters, pumps, and control valves based on the 20-year horizon demands currently in the BCWS model (year 2033 MDD and MDD+FF scenarios).

Develop Surge Model and Define Critical Surge Scenarios BC will perform a surge model analysis with the InfoWater/InfoSurge software. BC will work with BCWS to identify possible operational scenarios that may lead to surge conditions such as taking the

Page 11: Soter - Addendum 3a (BCWS) - Granicus

Exhibit A Page 3 of 5

Cooper Store or Camp Hall elevated tanks off-line for maintenance, pump power loss at the proposed Cooper Store booster pump station, inadvertent rapid valve opening or closure at Volvo, and pipe break scenarios. BC anticipates configuring at least 3 surge model scenarios.

Perform Surge Model Runs BC will use the InfoSurge model to perform the 3 surge model runs and propose surge mitigation measures as needed. It is anticipated that a surge tank or surge valves may be required at the Cooper Store booster station site. Hydraulic grade line (HGL) profiles will be developed showing the maximum and minimum head pressures during the surge event with and without surge suppression facilities.

Subtask 1.3. Conceptual Design

Confirm Pipeline Diameters and Tank Volume/OFE BC will utilize the pipeline routes identified in Exhibit A and confirm the pipeline diameters based on the demand assumptions and scenarios described above. BC will also provide recommended phasing, as needed, for pipeline contracts. BC will confirm the adequacy of the Camp Hall Tank volume and overflow elevation (OFE) based on the modeling and discussion with T&H regarding on-site pressure requirements. Currently the preliminary sizing is 0.75 MG with OFE of 242-ft. However, T&H is evaluating local site needs and may recommend raising the elevation.

Confirm Available Fire Flow for Volvo DFS at Each Phase BC will work with T&H to confirm and document the available fire flow to the Dedicated Fire System (DFS) at each phase.

Define Site Location and Piping Configuration for Sangree Control Valve/Master Meter Station No. 2 BC believes that Brighton Park Boulevard may be the best location for the proposed Sangree Control Valve/Master Meter Station No. 2. BC will complete a conceptual piping configuration plan which would allow Santee Cooper operations to convey water east toward the Sangare Tank and west to Nexton, Cooper Store Tank, and Camp Hall through separate existing and proposed control valve stations. BC will work with T&H and BCWS to come to an agreement on the best available site location, piping connection points, and any permanent valve closures required. Assumption: T&H will perform all required site surveys and to confirm suitability of proposed site, piping connections, and valve closures including evaluation of underground utilities. BCWS has improved the GIS along this corridor within the past year. However, BCWS is currently not in possession of all required record drawings, but it is assumed that Santee Cooper can provide these drawings.

Size Pumps, Control Valves, and Surge Suppression System

Proposed Cooper Store Pump Station

BC will select pump curves based on the modeling analysis results. Pump phasing may be required to satisfy near term and long term demands. BC will recommend the number and size of pump to satisfy Volvo Phase 1, Phase 2, and the BCWS “20-year horizon” (year 2033) demands identified in the BCWS water system master plan study, while taking into account a planned secondary supply from Lake Marion to Camp Hall. BC will also define any need to leave space in the proposed pump station for a future control valve to convey flow from Lake Marion to the BCWS system. BC will also revisit surge mitigation measures, if needed.

Page 12: Soter - Addendum 3a (BCWS) - Granicus

Exhibit A Page 4 of 5

Proposed Sangaree Control Valve/Master Meter Station No. 2 BC will select control valve and flow meter sizes based on the modeling analysis results considering year 2033 MDD+FF demand conditions. BC will also evaluate one existing master meter/control valve station as being out-of-service during ADD conditions (worst case Hwy 176) to verify the proposed sizing.

Develop Conceptual Design Sketches BC will develop conceptual site and mechanical plan sketches (15% design) for both the Cooper Store booster pumping station and Sangaree Control Valve/Master Meter Station No. 2. Site plans will show aerial photo background, preliminary location of proposed pump station, preliminary location of control valve/master meter station, and pipeline connection points. Mechanical plan sketches will show pumps, control valves, flow meters, and piping arrangements. Assumption: Sketches will be delivered in JPG and PDF format; CAD drawings will not be developed.

Subtask 1.4 Conceptual Design Report

Draft Report BC will prepare a draft conceptual design report that summarizes the detailed EPS and surge modeling analyses and facility sizing. The report will include the following:

• Description of each model run performed

• Hydraulic grade line profiles during normal operation and surge conditions

• GIS map showing minimum modeled pressure during critical design scenario(s)

• Summary of modeling results and conclusions

• Basis of design tables

• Conceptual design sketches for the Cooper Store pump station and Sangaree No. 2 stationDeliverables: Draft Report (PDF)

Final Report BC will incorporate BCWS and T&H staff comments on the draft report into the final master plan report. The Final Report will be delivered in digital format only. Deliverables: Final Report (PDF) and digital copy of InfoWater model

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Exhibit A Page 5 of 5

BC will work closely with T&H and BCWS to adhere to a critical timeline for this project. BC

understands that T&H must submit bid ready documents by the spring of 2016.

BC’s Project Manager will review work progress, monitor budget and schedule, and otherwise direct the progress of the work. BC will perform the following project administration:

• Communicate with BCWS and T&H via conference calls to facilitate an expedited schedule (48 hours budgeted, 24 hours each for two engineers)

• Provide monthly invoicing

• Communicate with the T&H and BCWS through a single point of contact, BC’s Project Manager

• Plan and perform project quality control and quality assurance

COMPENSATION Compensation for services provided under Tasks 1 through 4, as outlined in Exhibit A, Scope of Services, will be the lump sum of $85,000.00.

BC is not responsible for any schedule or cost impacts related to delays caused by protracted reviews, changes in scope of work, or other situations outside of our control. Changes to the Scope that vary dramatically or following approval of the Hydraulic Modeling/Surge Analysis phase may require additional effort and schedule beyond that which was assumed for this scope. If changes occur that may impact the level of effort, the BC PM will bring the issues to the attention of T&H to discuss a resolution which may include modifying or expanding the project scope and effort. The initial effort is limited to the hours identified in the above fee estimate. If the effort to complete the identified tasks exceeds the estimate, the PM will coordinate with T&H to identify areas we can limit our effort to the available budget.

Page 14: Soter - Addendum 3a (BCWS) - Granicus

Attachment A

Planned Projects by 2017 to Supply Volvo Phase 1

BCWS CIP Plan – Note that facility sizing may change