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Designing Collaboratively Using CMAR Approach and Envision for Hardeeville WRF Upgrade and Expansion

Christopher Crotwell, P.E.

Envision

Change of Plans

Overview

Pre-Construction Coordination

BIM Models

Overview

• Serves two counties• Public, non-taxing

• Water accts: 53,000• Sewer accts: 35,000

• Hardeeville: 1,656 accts• 20 mgd of drinking water• Treats 9 mgd of wastewater• BJWSA acquired the City of

Hardeeville’s water and sewer utility in 2001

Hardeeville

Beaufort-Jasper Water & Sewer Authority (BJWSA)

0 2 4 6 8

Point South

Palm Key

Palmetto Bluff

St. Helena

Laurel Bay

Hardeeville

Cherry Point

Port Royal

BJWSA has 8 wastewater treatment plants

• 1 MGD → 2.7 MGD (4 MGD future)• Mainly greenfield expansion• Project includes:

• Headworks• Flow EQ• Oxidation ditches with anoxic zones• Secondary clarifiers• Cloth disk filters (planned)• Chlorine contact chambers• Sludge holding• Operations building

Hardeeville WRF is expanding for growth

• CMAR contract• SRF funding

• Applying for Green Funding• Envision certification

The project has unique features

• Stacked-tray grit removal system• Large bubble mixing system• Cloth disk filters • Multi-purpose ops building

The project has unique designs

• SRF funding can be used on Alternate Delivery projects in SC• CMAR can self-perform in SC (unlike NC)• Working closely with DHEC

• DHEC attended all workshops• DHEC assisted with approval schedule

• Project can be permitted at GMP stage• Green Funding: energy reduction → lower interest rate

State Revolving Fund will be used

• Selected engineer first via RFQ / RFP• Prepared RFQ for CMAR

• Shortlisted 3 CMARs for proposals, interviews. Evaluated:• Qualifications• Approach• Ability to meet SRF requirements• References• Price proposal (% fee, fixed cost GCs, pre-construction)• Interview

CMAR was selected via detailed process

Pre-Construction Coordination

• Online meetings• BJWSA, HDR, CMAR

• Reviewed design status, questions, latest BIM models

Bi-weekly progress meetings were held

Agenda Project: Hardeeville WRF Expansion (242104)

Subject: Progress Meeting

Date: Friday, January 23, 2015

Location: BJWSA Administrative Building (6 Snake Road, Okatie, SC 29909)

Attendees: David Christopher Christopher Crotwell Tracy Lewis

Review of Site Layout Options

o Switching location of EQ/headworks with aeration location. Benefits:

Shorter pipe lengths

Simpler piping with less doubling back

o Need for sludge drying beds

o Proximity of dewatering/chemicals to road

o Buffer

o RAS/WAS pump stations

o Need for intermediate pumping (hydraulic profile)

o Room for primary clarifiers/anaerobic basins

o Aeration basin configuration: U-shape vs traditional (CMAR decide?)

EQ basin use plan, lining

RAS/WAS pump layout

Filter layout

EcoVerde – how operating, anticipated hydrogen sulfide concentrations

o EQ air changes

Existing I/C and SCADA, what they will be looking for in the new system

• Held at CMAR kick-off, 30%, 60% design• Reviewed VE and constructability comments from CMAR• Reviewed BJWSA comments• Agreed upon changes for next steps in design• Used SharePoint site to share documents

Multiple workshops were held

• Provided at 30% and 60%• Initial VE → $4M reduction

• Eliminated dewatering building• Modified site layout• Changed coatings• Modified drainage• Eliminated one mechanical screen

CMAR provided value engineering comments

Ref.No.

Reportor

SpecSection

ReportPage or

SpecPara. No.

Dwg DwgSet Comment Reviewer Discipline

HDRResponse

ByHDR Response

220 17Y - 60% Can we show the Non Potable Water System on the P&ID's? RLM Inst Crotwell

We do show NPW connections to certain equipment but do not typically show the whole system

221 17Y-03 60% 12 Air Zones are show should isolation valves be provide per zone? RLM Process Crotwell No isolation valves required

between VCP and manifold

222 17Y-07 60%

At Zone 4 it shows 2 lines coming off going to the Clarifier Splitter Box. The yard pipe drawing shows one pipe and should there be yard valves installed?

RLM Inst CrotwellYard piping dwg is correct, two parallel pipes go from Aeration to clarifier splitter box

223 17Y-07 60%

On P&ID 17Y-07 the compressed air system shows a valve in zone 3 and on 17Y-08 there is no valve. Which one is correct? Should each header have a isolation valve?

RLM Process Crotwell Motorized valve to zone 3 should be deleted

224 17Y-08 60%

At Zone 4 it shows 2 lines coming off going to the Clarifier Splitter Box. The yard pipe drawing shows one pipe and should there be yard valves installed?

RLM Inst Crotwell

17Y-08 is not shown correctly with regards to this piping; we will update for Final Design; 04D and yard piping dwgs are correct

225 17Y-09 60% The SI (Secondary Influent) is not show on the P&IDs RLM Inst Crotwell Not sure what this means?

226 17Y-09 60%

Should the Secondary Clarifiers have Non Potable Water (NPW)? Drawing 01C-52 yard pipe shows it going to the area.

RLM Inst Crotwell Yes; we will provide more direction

227 17Y-09 60%

Should the Secondary Clarifier Splitter Box have Non Potable Water (NPW) for wash-down? Drawing 01C-52 yard pipe shows it going to the area.

RLM Inst Crotwell Yes; we will provide more direction

228 17Y-09 60%

The P&ID's show a ML assuming Mix Liquor. This is not called out in Specification 400500-14 nor is it shown on the yard pipe drawings.

RLM Inst Crotwell It should be SI for Secondary Influent

229 17Y-09 60%

Two lines are entering the Clarifier Splitter Box and show coming from 17Y-07 should one be from 17Y-07 and 17Y-08?

RLM Inst Crotwell Refer to yard piping

• Comment logs provided at 30% and 60% design• Items included:

• Structural comments to simplify number of joints, pours• Combine filter and chlorine contact chamber structures• Minimize tie-ins and construction on existing site

CMAR provided constructability reviews

BIM Models

• For design: Revit• Cost estimate take-offs• Clash detection• Biweekly meeting model review

• For sharing: Navisworks

Project was modeled in BIM

Envision Certification

• Managed by Institute for Sustainable Infrastructure (ISI)

• Facilitates and measures project sustainability during design, construction

• Recognizes transformational, collaborative approaches to assess sustainability over a project’s life cycle

• Evaluates through 60 sustainability credits, divided into five sections

Envision® is a framework

• Current U.S. infrastructure rating systems are sector-specific• No U.S. system covers all aspects of infrastructure

Envision® was developed to fill a gap

Verification is based on 90% design

Note:ISI verifies Envision projects.USGBC certifies LEED projects.

Owner, Engineer, CMAR completed initial assessment

33% of total applicable points =

Silver

• LD1.1 – Provide effective leadership and commitment

BJWSA has led the way in sustainability

• QL1.2 – Stimulate sustainable growth and development• LD2.2 – Improve infrastructure integration• RA3.1 – Protect fresh water availability

Design meets reclaimed water standards

1,149

676

253272 225113

0

200

400

600

800

1,000

1,200

1,400

UOD TSS BOD

lb/d

Permit Requirement Design Basis

30

118

10

51

0

5

10

15

20

25

30

35

TSS BOD Ammonia-Nm

g/L

Permit Requirement Design Basis

• RA2.1 – Reduce energy consumption• QL2.3 – Minimize light pollution• CR2.2 – Avoid traps and vulnerabilities

New equipment is energy-efficient

Mixers Lighting

• Could be first Envision-certified wastewater project in SCSubmitting for verification soon

Change of Plans

• CMAR coordinated bidding tasks• Relayed questions to Engineer• Developed addenda for bidders• Split project into packages for subcontractor bidding

• GMP came in significantly above 30% estimate• Difficulty getting subs to bid• Escalating labor prices• Recent flooding concern for site work and dewatering

CMAR prepared a guaranteed max price

• Ended CMAR contract after pre-construction• Project now being bid openly

• Hope to get more bidders, competitive pricing• Can defend to Board that most competitive pricing is obtained• Some design changes incorporated

Owner decided to change the contract

• Aeration basins → ox ditches• Raised hydraulic grade line by 5 ft• Abandoned existing clarifier,

installing 2 larger clarifiers• Deferring filter installation• Other miscellaneous changes

Design and scope have changed

• Christopher.crotwell@hdrinc.comQuestions?

• Registration: $1,000• Verification:

Fees depend on project size, ISI membership

Project Size ($) Non-Member ISI Member

≤ 2 M $ 3,000 $ 2,400

2 - 5 M $ 8,500 $ 7,000

5 - 25 M $17,000 $14,000

25 - 100 M $25,000 $21,000

100 - 250 M $33,000 $28,000

> 250 M Contact ISI for large or multi-phase projects