Green Stormwater Instrastructure Decision Tree Tool
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Transcript of Green Stormwater Instrastructure Decision Tree Tool
Slide Credit: Frank McLaughlin, NJDEP and Camden SMART
NJIT TAB Green Stormwater Infrastructure Decision Tree Tool
Cost to Remediate
Environmental Benefits
USEPA’s July 2013 “Implementing Stormwater Infiltration Practices at Vacant Parcels and Brownfields Sites”
www.njit.edu/tab Click on “tools”
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”
Workflow Diagram
Fact Sheet 1: CSM
Source: ITRC Remediation Process Optimization Advanced Training www.itrcweb.org
Elevated Rail
East Street
North Street
South Street
East Street
West Street
North Street
Public Park
Elevated Rail
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
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)
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
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
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
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
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
Decision Tree – Risk Analysis
Are you feeling lucky?
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
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
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
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
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