Green Stormwater Instrastructure Decision Tree Tool

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Slide Credit: Frank McLaughlin, NJDEP and

Transcript of Green Stormwater Instrastructure Decision Tree Tool

Page 1: Green Stormwater Instrastructure Decision Tree Tool

Slide Credit: Frank McLaughlin, NJDEP and Camden SMART

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Components of the Tool• Workflow Diagram• Fact Sheets 1-4– Conceptual Site Model

(CSM)– Cost Estimation– Cost Benefit Analysis– Decision Tree

Option scenarios including: 1. No further environmental investigation/no

build 2. No further environmental investigation/build 3. Mitigation/build 4. Remediation/build

Graphic Source: USEPA’s July 2013 “Implementing Stormwater Infiltration Practices at Vacant Parcels and Brownfields Sites”

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Workflow Diagram

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Fact Sheet 1: CSM

Source: ITRC Remediation Process Optimization Advanced Training www.itrcweb.org

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Elevated Rail

East Street

North Street

South Street

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East Street

West Street

North Street

Public Park

Elevated Rail

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Fact Sheet 1: CSM

CASE STUDY: 2316-50 N. 11th St. CONCEPTUAL SITE MODEL

NJIT Brownfield Green Stormwater Infrastructure (GSI) Planning ProjectSHEET 1 OF 1

Comments/Revisions: This diagram provides a simplified Conceptual Site Model (CSM) based on infomration collected from review of historical land use source materials. Date: 08.23.16

File No.: 01

Designer: MB

PotentialPrimary Sources Contaminants Exposure Receptors

Underground storage tanks and piping

Underground storage tanks and piping

Subsurface demolition debrisSubsurface demolition debris

Former industrial operationsFormer industrial operations

Heavy petroleum hydrocarbons(PAHs)

Heavy petroleum hydrocarbons(PAHs)

Inorganics (Mercury/Lead)SOCs

Inorganics (Mercury/Lead)SOCs

Inhalation of fugitive dustInhalation of fugitive dustMigration vis saturated zoneMigration vis saturated zone

Migration vis unsaturated zoneMigration vis unsaturated zone Inhalation of vaporsInhalation of vapors

Ingestion of soil and dustIngestion of soil and dust

Dermal contact soil and dustDermal contact soil and dust

Primary Release Mechanism

Area residents or commercial/institutional buildings

Area residents or commercial/institutional buildings

Site visitors/workersSite visitors/workers

Biota aqauticBiota aqautic

Biota terrestrialBiota terrestrialDust or volatile emissionsDust or volatile emissions

Secondary SourcesSecondary Release

Mechanism

SoilSoil

Spills/LeaksSpills/Leaks

Infiltration/PercolationInfiltration/PercolationStormwater runoffStormwater runoff

Not likely due to distance from

rivers

Main concern is former manufacturing operations at electrical equipment warehouse. Boilers existed at the electrical equipment co. and the ice manufacturing company, which indicates possibility for USTs and piping. Demolition debris in the subsurface is also of concern.

Mainly concern for Area 2 only since Area

1 is capped.

VOCsVOCsHighly mobile: vapor/gw concern

Less mobile: direct contact concern

Area 1: Capped Area 2: Unpaved

Active store-front Church

Former small office/commercial building not a concern

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Fact Sheet 2Cost Estimate

How much does it cost to investigate and remediate the site?Case Study Assumptions:2.25 acres Remediation: Closure of (2) USTs, excavate and dispose of 750 tons of non-hazardous contaminated soil and construct a 6” stone cap.

4 Scenarios:1. No Further environmental investigation / Don’t Build GSI (aka Do Nothing / No Build)2. No Further environmental investigation / Build GSI (aka Do Nothing/ Build)3. Mitigation / Build GSI (aka Mitigate)4. Remediate / Builds GSI (aka Remediate)

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Description Bid Quantity Total Cost Bid Quantity Total Cost Bid Quantity Total Cost

Project Control and Management LS 5,000.00$ 1 5,000.00$ 1 5,000.00$ 2 10,000.00$ Regulatory Coordination HR 120.00$ 0 -$ 0 -$ 36 4,320.00$ Review of Environmental Case Files LS 2,500.00$ 1 2,500.00$ 1 2,500.00$ 1 2,500.00$ Permits, Forms and Certifications LS 2,000.00$ 1 2,000.00$ 1 2,000.00$ 1 2,000.00$ QAPP LS 2,500.00$ 0 -$ 1 2,500.00$ 1 2,500.00$ HASP LS 1,200.00$ 1 1,200.00$ 1 1,200.00$ 1 1,200.00$ Public Notification LS 850.00$ 0 -$ 1 850.00$ 1 850.00$ Receptor Evaluation LS 2,500.00$ 0 -$ 1 2,500.00$ 1 2,500.00$ Blended Labor Rate HR 100.00$ 60 6,000.00$ 60 6,000.00$ 180 18,000.00$ Phase II Investigation Report LS 3,500.00$ 1 3,500.00$ 1 3,500.00$ 0 -$ Remedial Investigation Workplan LS 4,500.00$ 0 -$ 0 -$ 1 4,500.00$ Remedial Investigation Report LS 5,500.00$ 0 -$ 0 -$ 1 5,500.00$ Remedial Action Report LS 6,500.00$ 0 -$ 0 -$ 1 6,500.00$ Environmental Closure LS 4,000.00$ 0 -$ 0 -$ 1 4,000.00$

$ 20,200.00 $ 26,050.00 $ 64,370.00

Geophysical Survey (half-day) LS 1,250.00$ 1 1,250.00$ 1 1,250.00$ 0 -$ UST Closure: 10,000-15,000 Gal. EA 18,000.00$ 0 -$ 0 -$ 2 36,000.00$ Geoprobe and operator DAYS 2,400.00$ 2 4,800.00$ 3 7,200.00$ 0 -$ Temporary groundwater sampling points FEET 8.50$ 0 -$ 450 3,825.00$ 0 -$ Installation of 2" wells (50-ft.) EA 4,500.00$ 3 13,500.00$ 0 -$ 3 13,500.00$ Groundwater monitoring events EA 2,500.00$ 2 5,000.00$ 0 -$ 2 5,000.00$ Loader and operator DAYS 1,860.00$ 2 3,720.00$ 1 1,860.00$ 3 5,580.00$ Excavator with jackhammer and operator (excavation and select demolition)

DAYS 2,575.00$ 2 5,150.00$ 1 2,575.00$ 3 7,725.00$

Laborer DAYS 800.00$ 2 1,600.00$ 1 800.00$ 3 2,400.00$ Field screening (e.g. PID, XRF, etc.) DAYS 350.00$ 2 700.00$ Disposal of C&D waste TONS 175.00$ 15 2,625.00$ 15 2,625.00$ 125 21,875.00$ Off-site recycling or disposal of concrete and masonry debris

TONS 55.00$ 60 3,300.00$ 60 3,300.00$ 180 9,900.00$

Disposal of non-hazardous liquid waste GALS. 1.75$ 1,200 2,100.00$ 1,200 2,100.00$ 4,800 8,400.00$ Disposal of Unsuitable Materials and IDW (20 CY Roll-Off)

EA 1,800.00$ 1 1,800.00$ 1 1,800.00$ 4 7,200.00$

Remedial Excavation: Excavated and stockpiled material CY 8.00$ 0 -$ 0 -$ 750 6,000.00$

Remedial Excavation: Excavated material screened, loaded, transported and disposed off-site at a licensed and approved solid

TON 65.00$ 0 -$ 0 -$ 750 48,750.00$

Remedial Excavation: Certified clean backfill emplaced and compacted. TON 35.00$ 0 -$ 0 -$ 750 26,250.00$

Stone Cap Construction CY 30.00$ 0 -$ 0 -$ 20 600.00$ Chain Link Fence and Gates FT 5.00$ 0 -$ 0 -$ 250 1,250.00$

$ 45,545.00 $ 27,335.00 $200,430.00

-$ $ 13,950.00 $ 23,150.00 $ 65,745.00 $ 67,335.00 $287,950.00

Unit Unit Price

Stage 2/Field Investigation Stage 3/Site Investigation Remediation

Professional Services

Subtotal:Subcontractors

Subtotal:Laboratory Analysis

Subtotal:Total:

Tier Cost

Tier 1 Desktop investigation

$5K

Tier 2 Field Investigation

$66K

Tier 3Site Investigation

$67K

Remediation $288K

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Fact Sheet 3 – Cost Benefit Analysis Scenario

Do-Nothing / No Build (NO GO)

Do-Nothing /Build (GO)

Mitigate / Build (GO)

Remediate / Build (GO)

CostsEnvironmental Planning        Tier 1: Desktop Investigation/Site Inspection $5K $5K $5K $5K Tier 2: Field Screening $66K $66K $66K $66K Tier 3: Environmental Site Investigation $0K $0K $0K $67K

Remediation $0K $0K $0K $288K Planning, Design and Construction of GSI $0K $70K $88K $70K O&M (10 Yr.) for GSI $0K $35K $44K $35K

Total Costs: $71K $176K $202K $531K

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What are some of the benefits of GSI?Can you put a dollar figure to that?

Fact Sheet 3 – Cost Benefit Analysis

Do-Nothing / No Build (NO GO)

Do-Nothing /Build (GO)

Mitigate / Build (GO)

Remediate / Build (GO)

1. Increase in property value $0K $50K $50K $200K2.3.4.

Total Benefits: $0K

Benefits

Scenario

Hint: Site is 2.25 Acres in Downtown

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Do-Nothing / No Build (NO GO)

Do-Nothing /Build (GO)

Mitigate / Build (GO)

Remediate / Build (GO)

1. Increase in property value $0K $50K $50K $200K2. Improved public and worker health and safety $0K $0K $10K $10K3. Increased environmental services $0K $10K $10K $10K4. Gray infrastructure costs avoided $0K $200K $200K $200KOR # of new Greened Acres

Total Benefits: $0K $260K $270K $420K

Benefits

Scenario

Fact Sheet 3 – Cost Benefit Analysis

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Which is the best scenario? What should we do?

Do-Nothing / No Build (NO GO)

Do-Nothing /Build (GO)

Mitigate / Build (GO)

Remediate / Build (GO)

Total Costs: $71K $176K $202K $531K

Total Benefits: $0K $260K $270K $420K

Net Benefits: $-71K $84K $68K $-111K

Costs

Benefits

ScenarioNet Benefits

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Decision Tree – Risk Analysis

Are you feeling lucky?

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Fact Sheet 4 – Decision Tree Risk Benefit Analysis

Do-Nothing / No Build (NO GO)

Do-Nothing /Build (GO)

Mitigate / Build (GO)

Remediate / Build (GO)

Net Benefits: $-71K $84K $68K $-111K

Scenario

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Risk / Probability

Do-Nothing / No Build (NO GO)

Do-Nothing /Build (GO)

Mitigate / Build (GO)

Remediate / Build (GO)

Total Costs: $71K $176K $202K $531KTotal Benefits: $0K $260K $270K $420K

Net Benefits: $-71K $84K $68K $-111K

Risk / Benefit

Scenario

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Calculation Exercise

Probability the Site is clean (N%) * $84K+Probability the Site is dirty (100-N%) * -111K

What is the sum of these numbers?

Do-Nothing / No Build (NO GO)

Do-Nothing /Build (GO)

Mitigate / Build (GO)

Remediate / Build (GO)

Net Benefits: $-71K $84K $68K $-111KCalculated Risk Benefit

Scenario

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Risk Benefit Analysis

Now which one looks like our best option?

Do-Nothing / No Build (NO GO)

Do-Nothing /Build (GO)

Mitigate / Build (GO)

Remediate / Build (GO)

Net Benefits: $-71K $84K $68K $-111KRisk / Benefit

Calculated Risk Benefit Analysis (using 50%

probability) $-71K $-13K $68K $-111KCalculated Risk Benefit

Analysis (using 70%/30% probability) $-71K $26K $68K $-111K

Scenario

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NJIT TAB GSI Tool

www.njit.edu/tab Click on “tools”http://www5.njit.edu/tab/tools-1/

Source: CamdenSmart http://www.ccmua.org/?page_id=2069

Source: EnviroSure Inc, RIW South Waterfront Service Station, September 2009