20062_Belton St_Revised Request for Occupancy Report_David Weekley_2019.03.29

Mr. Kelly Johnson & Ms. Joselyn Harriger
March 29, 2019
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H&H conducted the VIMS inspections, pre-occupancy testing, and sampling activities in
accordance with the Vapor Intrusion Mitigation Plan (VIMP) approved by the North Carolina
Department of Environmental Quality (DEQ) Brownfields Program on November 5, 2018. The
residential townhomes were recently constructed and are currently owned by David Weekley
Homes for pending sale to individual homeowners.

Based on the results of the inspections, testing, and sampling activities, H&H is requesting that the
DEQ Brownfields Program grant occupancy for the residential units 10A and 10B. Please note
that David Weekley Homes currently owns ten (10) additional townhomes and two (2) single-
family structures located on the Belton Street Brownfields Site that are currently in various phases
of construction. H&H will submit a separate request for occupancy of the additional townhomes
and single-family structures at a later date once construction is near completion. The David
Weekley Homes portion of the Belton Street Homes Brownfields Site is depicted on Figure 1 and
a VIMP Master Summary is included as Table 1. A summary of the VIMS installation inspection,
pre-occupancy testing, and sampling activities is provided in the following sections.

2.0 VIMS Inspections, Testing, and Sampling

During construction activities, H&H conducted VIMS inspections, pre-occupancy testing, and
sampling activities which are summarized below in the following sections.

2.1 VIMS Inspections 

Between September 11, 2018 and February 28, 2019, H&H inspected the VIMS installation at the
following four stages during the construction process:

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 after completion of the sub-slab piping and gravel layout;
 after placement of the Drago-Wrap vapor barrier on top of the piping layout and gravel
layer;
 after installation of above-grade riser piping within the townhomes; and
 after installation of the fan and vacuum alarms.

Of particular note, H&H had to perform the two re-inspections of Units 10 A/B for the following
reasons:

1) During an inspection (Inspection 3) of Unit 10A conducted on December 3, 2018, H&H noted
that a horizontal PVC pipe to the fan needed to be slanted away from the fan. H&H’s Alexis
McKenzie and Andrew Besu conducted a follow up inspection of Unit 10A on December 5,
2018 and confirmed that the horizontal PVC pipe to the fan had been repositioned by the
contractor at a slight angle to insure moisture (if collected in the line) would collect in a portion
of the pipe away from the fan unit.

2) During an inspection (Inspection 4) of Unit 10B conducted on February 28, 2019, H&H noted
that the alarm in Unit 10B did not go off when the fan was unplugged. H&H contacted the
VIMS installer Andrew Copeland (w/ Copeland Technical Solutions) who troubleshot the
alarm issue in Unit 10B and found that the Unit 10A fan was still running during the initial
inspection after H&H had turned off the Unit 10B fan. Thus, vacuum was being pulled below
Unit 10B from the Unit 10A fan. After shutting off fans from both Units 10 A/B, H&H noted
that both alarms were activated thus confirming that the alarms were operating properly.

After inspection and reinspection activities, H&H concluded that the VIMS within each residential
unit has been properly installed by the contractor and tested for the above listed units as activated
systems equipped with electric fans in accordance with the DEQ-approved VIMP. VIMS
Inspection Logs are included in Appendix A.
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2.2 Pilot Influence Testing 

On October 24, 2018, H&H conducted “pilot” influence testing to the vent pipe network installed
below the concrete slabs of the townhomes to verify that VIMS was providing sufficient vacuum
influence. During influence testing, H&H utilized the permanent specified RadonAway RP-145
vapor extraction fans which were attached to the vertical riser piping located in the attic of each
unit. Prior to turning the fans on, vacuum measurements were collected at each pressure measuring
point to establish baseline conditions. After baseline conditions were recorded, fans were
activated. A Dwyer series 475 Mark III Digit manometer (capable of measuring to 0.001 inches
of water column (in-WC) or 0.25 Pascals [Pa]) was then connected to each pressure measuring
port via Teflon tubing to record differential pressures. H&H collected vacuum measurements at
20-minute intervals at each of the four pressure measuring points over an approximately 40-minute
period.

Sub-Slab VIMS Pilot Test field logs summarizing vacuum and flow measurements at each vapor
extraction point location and differential pressure measurements at each observation (pressure
monitoring) point during the testing are provided as Appendix A. A figure which identifies the
vapor extraction and observation point locations is provided as Figure 2.

The minimum vacuum observed for Units 10A and 10B was 445 Pa and the maximum was 492
Pa. Results of the influence testing indicate that differential pressures measured at the observation
points during the testing are significantly above the minimum depressurization reading (4 Pa)
deemed acceptable by DEQ Brownfields to demonstrate that the VIMS is sufficiently
depressurizing the sub-slab.

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2.3 Sub-Slab Vapor Sampling

On November 16, 2018, H&H collected one sub-slab vapor sample from below each townhome
unit and a duplicate sample for quality control purposes. The sub-slab gas samples were collected
from permanent vacuum measuring ports as shown on Figure 2.

The vacuum measuring points were sampled by emplacing a temporary expandable plug with
sample port into the point to create an air-tight seal, and using recommended procedures presented
in the Division of Waste Management (DWM) Vapor Intrusion (VI) Guidance. Prior to sample
collection, a leak test was performed on each vacuum measuring point by placing a shroud around
the point, saturating the air within the shroud with helium gas, then purging soil gas from the
sampling point with a GAST vacuum pump into a Tedlar® bag. A helium gas detector was used
to measure helium concentrations in the shroud and bag. The leak test was considered successful
if the helium concentration measured in the soil gas purged from the sampling point was less than
10% of the concentration measured in the shroud. Successful completion of this leak check
ensured that short-circuiting at the sample point did not occur and that the data collected accurately
represented soil gas concentrations. Sub-Slab Soil Gas Field Forms are included in Appendix A.

Following a successful leak check, the sub-slab samples were collected into batch-certified 1-liter
stainless steel Summa canisters connected to an airflow regulator preset by the laboratory to collect
over a 10-minute period. Vacuum inside the summa canisters was recorded prior to and following
the 10-minute sampling period to ensure adequate sample volume was collected. Per Brownfields
Program request, the samples were submitted for analysis of select volatile organic compounds
(VOCs) by EPA Method TO-15 to Con-Test Analytical Laboratory (Con-Test). For quality
control purposes, H&H collected one duplicate sub-slab soil gas sample (Dup) from the same
location as the parent sample, SS-405, which was analyzed for select VOCs. A tabular summary
of the sub-slab soil gas analytical results is presented in Table 1. The laboratory analytical report
and chain of custody record is provided as Appendix B. The laboratory analytical results were
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compared to the DEQ DWM Residential Sub-Slab and Exterior Soil Gas Screening Levels
(SGSLs) dated February 2018.

As a conservative measure, the detected sub-slab soil gas concentrations were entered in DEQ’s
Vapor Intrusion Screening Level (VISL) Soil Gas to Indoor Air Risk Calculator to calculate
cumulative risks using the compounds detected for each sub-slab sample location. Copies of the
risk calculators are provided in Appendix C and calculated Lifetime Incremental Cancer Risks
(LICRs) and Hazard Index (HI) values are summarized in Table 1.

Several VOCs were detected in the sub-slab samples (SS-405, SS-407 and Dup). However, none
of the constituents were detected above the Residential Soil Gas Screening Levels (SGSLs). As
indicated in Table 1, the calculated LICR for Unit 10A (405 Belton Street) was calculated at 0,
and the calculated LICR for Unit 10B (407 Belton Street) was calculated at 8.1 x 10-7, both of
which are notably below the acceptable risk range of 1 x 10-4 to 1 x 10-6. The HI for Unit 10A was
calculated at 2.3 x 10-2 and the HI for Unit 10B was calculated at 1.5 x 10-2, which are below the
threshold of 1. Therefore, VOC vapor concentrations detected below the sub-slabs in Units 10A
and 10B do not appear to pose an unacceptable risk to future occupants of the residential townhome
units.

2.4 Functional Check-Out Testing 

On February 28, 2019, H&H verified that the VIMS fans (RadonAway® RP-145 fans, two fans
(one fan per duplex) and vacuum alarms (RadonAway® Mitigation IIA) were functioning properly
after installation. H&H also conducted the functional check-out test of the VIMS in each
townhome which indicated that the VIMS fans were effectively depressurizing the sub-slab below
the townhome units. Using a manometer, H&H collected vacuum readings ranging from 91 to
118 Pa for the two townhomes, which are well above the minimum depressurization reading (4
Pa) deemed acceptable by the DEQ Brownfields Program to demonstrate that that the VIMS is
sufficiently depressurizing the sub-slab.
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3.0 Summary and Recommendations

Based on the results of our recent VIMS inspection, testing, and sampling activities, H&H certifies
that the VIMS associated with the Belton Street residential townhome units 10A and 10B (405 and
407 Belton Street) have been properly installed per the approved VIMP and the VIMS appears to
be effectively depressurizing the sub-slab while the fans are operating. In addition, based upon
the sub-slab vapor sampling results, the VOC vapor concentrations detected below the sub-slab do
not appear to pose an unacceptable risk to future occupants of the residential townhome units.

Therefore, H&H requests that the DEQ Brownfields Program grant occupancy for the
aforementioned units. Post-occupancy testing and further sampling (if required) will be conducted
in accordance with the approved VIMP.

Mr. Kelly Johnson & Ms. Joselyn Harriger
March 29, 2019
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If you have any questions or require additional information, please do not hesitate to contact us at
704-586-0007.

Sincerely,

Hart & Hickman, PC

Trinh DeSa, PE Matt Ingalls
Senior Project Engineer Project Manager

#C1269 – Engineering
#245 - Geology

Attachments: Table 1 – Vapor Intrusion Mitigation Plan Master Summary

Figure 1 – Site Development Plan
Figure 2 – Influence Test and Sub-Slab Sample Location Map

Appendix A – VIMS Inspection Forms and Field Logs
Appendix B – Analytical Laboratory Report
Appendix C – Sub-Slab Soil Gas Risk Calculators
Table 1Vapor Intrusion Mitigation Plan Master SummaryBelton Street Brownfields SiteBrownfields Project No. 20062-16-060David Weekley HomesH&H Project No. DWH-002Date of Most Recent Update - 03/05/2019David Weekly Homes Single Home 4 Single Home 5Belton Street Address407 337 339 341 343 345 347 401 403 409 411 329 331Residential Unit Number10B 6A6B7A7B8A8B9A9B11A11B45VIMS Construction Inspection & CompletionSub-grade Piping Yes -- -- -- -- -- -- -- -- Yes Yes -- --Vapor Barrier - Drago-Wrap Yes -- -- -- -- -- -- -- -- Yes Yes -- --Above-Grade Riser Piping & Labels Yes -- -- -- -- -- -- -- -- Yes Yes -- --Fan & Alarm Installation & Operation Yes -- -- -- -- -- -- -- -- -- -- -- --Functional Check-out of Installed Fans & Alarm Functional Check-out Date -- -- -- -- -- -- -- -- -- -- -- --Vacuum Range at Measuring Ports (Pascals) -- -- -- -- -- -- -- -- -- -- -- --Influence Test ResultsInfluence Test Completion Date-- --Vacuum Range at Measuring Ports (Pascals)-- --Sub-Slab Sampling Results Sample IDSS-407-- -- -- -- -- -- -- -- -- -- -- --Sample Date11/16/18 11/16/18 11/16/18-- -- -- -- -- -- -- -- -- -- -- --VOCs by TO-15 (µg/m3)------------------------µg/m3Acetone460 460 130-- -- -- -- -- -- -- -- -- -- -- --220,000Benzene<0.26 <0.26 <0.26-- -- -- -- -- -- -- -- -- -- -- --1201,3-Butadiene<0.28 <0.28 <0.28-- -- -- -- -- -- -- -- -- -- -- --142-Butanone (MEK)1,200 1,000 150-- -- -- -- -- -- -- -- -- -- -- --35,000Carbon Disulfide<0.43 <0.43 <0.43-- -- -- -- -- -- -- -- -- -- -- --4,900Carbon Tetrachloride<0.41 <0.41 <0.41-- -- -- -- -- -- -- -- -- -- -- --160Chloroethane<0.32 <0.32 <0.32-- -- -- -- -- -- -- -- -- -- -- --70,000Chloroform3.1 3.3 3.3-- -- -- -- -- -- -- -- -- -- -- --41Chloromethane<0.28 <0.28 <0.28-- -- -- -- -- -- -- -- -- -- -- --630Cyclohexane<0.49 <0.49 <0.49-- -- -- -- -- -- -- -- -- -- -- --42,000Dichlorodifluoromethane (Freon 12)<0.432.5<0.43-- -- -- -- -- -- -- -- -- -- -- --700Ethylbenzene<0.50 <0.50 <0.50-- -- -- -- -- -- -- -- -- -- -- --3704-Ethyltoluene<0.60 <0.60 <0.60-- -- -- -- -- -- -- -- -- -- -- --NSHeptane<0.48 <0.48 <0.48-- -- -- -- -- -- -- -- -- -- -- --2,800Hexane<1.2 <1.2 <1.2-- -- -- -- -- -- -- -- -- -- -- --4,900Isopropanol<0.60 <0.60 <0.60-- -- -- -- -- -- -- -- -- -- -- --1,400Methyl tert-Butyl Ether (MTBE)<0.36 <0.36 <0.36-- -- -- -- -- -- -- -- -- -- -- --3,600Methylene Chloride1.3 J 1.6 J<0.84-- -- -- -- -- -- -- -- -- -- -- --4,2004-Methyl-2-pentanone (MIBK)<0.39 <0.39 <0.39-- -- -- -- -- -- -- -- -- -- -- --21,000Naphthalene<0.80 <0.80 <0.80-- -- -- -- -- -- -- -- -- -- -- --21Propene<0.34 <0.34 <0.34-- -- -- -- -- -- -- -- -- -- -- --21,000Styrene<0.53 <0.53 <0.53-- -- -- -- -- -- -- -- -- -- -- --7,000Tetrachloroethylene<0.75 <0.75 <0.75-- -- -- -- -- -- -- -- -- -- -- --280Tetrahydrofuran1,100 960 550-- -- -- -- -- -- -- -- -- -- -- --14,000Toluene3.2 2.5<0.39------------------------35,000Trichloroethylene<0.43 <0.43 <0.43------------------------14Trichlorofluoromethane (Freon 11)1.4 J1.2 J1.3 J------------------------NS1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)<0.93 <0.93 <0.93------------------------35,0001,2,4-Trimethylbenzene<0.63 <0.63 <0.63------------------------4201,3,5-Trimethylbenzene<0.62 <0.62 <0.62------------------------420Vinyl Chloride<0.32 <0.32 <0.32------------------------56m&p-Xylene<1.00 <1.00 <1.00------------------------700o-Xylene<0.54 <0.54 <0.54------------------------700Risk-Assessment - Soil Gas to Indoor AirCarcinogenic Risk (Resident)8.1 x 10-7------------------------Hazard Index (Resident)9.9 x 10-3------------------------Notes:1) North Carolina Department of Environmental Quality (DEQ) Division of Waste Management (DWM) Residential Sub-Slab and Exterior Soil Gas Screening Levels (SGSLs) (February 2018)2) Functional Check-out was performed with the installed fans and completed system in each unit and is representative of actual system conditions. µg/m3 = micrograms per cubic meter; NS = Not SpecifiedJ = detected concentration is above the laboratory method detection limit, but below the laboratory calibrated reporting limit. Therefore, the reported concentration is an estimated value.Risk assessment for sample SS-405/DUP calculated using the higher of the two concentrations for the parent and duplicate sample.Non-detect concentrations are reported as concentrations less than the laboratory method detection limit (MDL).-- --Duplex 9A/9B Duplex 11A/11B-- ----Duplex 8A/8B--Duplex 6A/6B Duplex 7A/7BDuplex 10A/10B----02/28/1991 - 11810AYesYesYes405YesSS-405 / Dup445 - 49210/24/180.02.3 x 10-2----Residential SGSLS:\AAA-Master Projects\David Weekly Homes (DWH)\DWH-002 - Belton Street\Occupancy Letter\10A and 10B\Tables\DWH - Belton St. VIMP Summary TableTable 1 Hart & Hickman, PC
MARION PLACEB
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SOUTH BOULEVARDPSG-1
011012021022031032352351342341332331322321312311302301SG-1
TMW-5/
SG-5 TMW-6
TMW-7
TMW-1
TMW-3/
SG-3
TMW-4/
SG-4
TMW-2/
SG-2
LOT 6ALOT 6BLOT 7ALOT 7BLOT 8ALOT 8BLOT 9ALOT 9BLOT 10ALOT 10BLOT 11ALOT 11BLOT 12ALOT 12BLOT 4ALOT 4BLOT 5(EXISTINGRESIDENCE)LOT 13ALOT 13BLOT 37/38(EXISTINGRESIDENCES)PULTE
HOMES
PULTE
HOMES
DAVID
WEEKLEY
HOMES
DAVID
WEEKLEY
HOMES
LEGEND
BROWNFIELDS PROPERTY BOUNDARY
BROWNFIELDS PROPERTIES UNDER DEVELOPMENT BY PULTE
HOMES
BROWNFIELDS PROPERTIES UNDER DEVELOPMENT BYDAVID
WEEKLEY HOMES
PERMANENT SOIL GAS POINT
FORMER SOIL GAS POINT
FORMER TEMPORARY MONITORING WELL LOCATION
JOB NO. DWH-002
REVISION NO. 0DATE: 10-09-18
FIGURE NO. 1
BELTON STREET HOMES
(BROWNFIELDS SITE #20062-16-060)
CHARLOTTE, NORTH CAROLINA
SITE DEVELOPMENT PLAN
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
PULTE HOMES UNITS REQUESTING OCCUPANCY (311, 312, 321,
322, 331, AND 332)
321181716151413121110987654HBWHWHSTUDY
ENTRY
DINING
KITCHEN
FAMILY
2 CARGARAGE
COVEREDPORCH10-0 SOFFIT
PWDR2-0
2-42-42-8
(3)4-0 6-0 FX@ 8' - 0"(3)4-0 6-0 SH@ 8' - 0"
REFG.CPTHSDW16-0 7-0 GARAGE DOOR
3-0 8-0
(2)3-0 6
-0 SH@ 8
' - 0"
2-8 FR DR
2-0 4-0 SH@ 8' - 0"(2)2-6 4-6 SH MULLED@ 8' - 0"SLOPE181716151413121110987654321ENTRY
DINING
UTIL
KITCHEN
FAMILY
OWNER'S
RETREAT
OWNER'SBATH2 CARGARAGE
COVEREDPORCH10-0 SOFFIT
PWDR
2-8 2-42-42-82-42-49-0 CLG2-8
2-6
2-02-8 FR DR
4-0 6-0 FX@ 8' - 0"
3-0 6-0 SH@ 8' - 0"3-0 6-0 SH@ 8' - 0"3-0 6-0 SH@ 8' - 0"3-0 6-0 SH@ 8
' -
0"(3)3-0 6-0 FX@ 8' - 0"3-0 6-0 SH@ 8' - 0
"RANGE W/
OVEN
REFG.DW34" HIGH HANDRAIL
SLOPE SLOPE
CPTHS
CPTHSCPTHSSLOPE
10-020-4ARCH3-0 8-0
16-0 7-0 GARAGE DOOR
2-0 2-0 FX@ 11' - 4"SLOPEWASHERDRYERSim1.A5.02Sim1A5.03SimOP-2
OP-1
OP-3
OP-4
SS-405/DUP
SS-407
LOT 10A/10B
BELTON STREET
REVISION NO. 0
JOB NO. DWH-002
DATE: 3-5-19
FIGURE NO. 2
BELTON STREET HOMES
(BROWNFIELDS SITE #20062-16-060)
CHARLOTTE, NORTH CAROLINA
INFLUENCE TEST AND SUB-SLAB SAMPLE
LOCATION MAP
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
LEGEND
BUILDING OUTLINE
SLOTTED PIPING
VERTICAL RISER
VACUUM MEASURING PORT
(INTAKE SCREEN AT THE END OF PIPE)
NOTES:
1) INFLUENCE TEST CONDUCTED ON OCTOBER 24, 2018 AND SUB-SLAB
SAMPLES COLLECTED ON NOVEMBER 16, 2018.
2) OP = VACUUM MEASURING PORT
3) SS = SUB-SLAB SAMPLE LOCATION
S:\AAA-Master Projects\David Weekly Homes (DWH)\DWH-002 - Belton Street\VIMP Figures\Drawing1.dwg, 11x17 L, 3/5/2019 2:42:09 PM, amckenzie

Appendix A
VIMS Inspection Forms and Field Logs

Sub-Slab / Soil Gas Vapor QA/QC Field Form Project No.:____________________
Depth of
Screen Date & Time Ambient
Temp.Purge Method Purge Vol Helium Conc.
Shroud
Helium Conc.
Purge
Leak Test
Passed
Yes / No SS, SG perm.,
temp.
concrete, wood,
asphalt, grass, soil,
gravel etc.
thickness
inches
(if appl.)
ft bgs mm/dd/yy
24-hour clock oF syringe, peristaltic,
etc.Liters %% or ppm
(indicate units
below)
Yes / No
(see note)
S:
C:
R:
S:
C:
R:
S:
C:
R:
S:
C:
R:
S= sample; C/R = canister/regulator; SS = sub-slab; SG = soil gas; perm = permanent; temp = temporary
Sampler(s):___________________________________________________________
Weather:___________________________________________________________
Notes:___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
Helium Leak TestCanister /
Regulator
Shut-in Test
Passed Ground SurfaceID Numbers
Sample /
Canister /
Regulator
Type
Vapor Monitoring Point Construction
General Field Sketch of Sample Locations

Note: Leak Test Requirements
Per NC DEQ DWM Vapor Intrusion
Guidance, leak test passes if helium
concentration in purge air is less than
10% of helium concentration in shroud.

S:\BBB Master Templates\Forms - Soil Gas\Sub-slab & Soil Gas QA_QC Field Form
Sub-Slab / Soil Gas Sampling Vapor QA/QC Field Form
Hart & Hickman, PC
Initials________________________
Sub-Slab VIMS Pilot Test
Site Address:__________________________________________________________________________
Date: ___________ Test Start Time:___________ Weather:_______________________________
Sub-Slab Test # _______ Location:_______________________________________________________
Time
Fan #1 Suction Point Vacuum (“WC)
Fan #1 Air Flow (CFM)
Fan #2 Suction Point Vacuum (“WC)
Fan #2 Air Flow (CFM)
Observation
Point
Baseline
Pressure
Pressure
“WC
Pressure
“WC
Pressure
“WC
Pressure
“WC
Pressure
“WC
OP #1
OP #2
OP #3
OP #4
Comments____________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________

Appendix B

Laboratory Analytical Reports

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Appendix C

Sub-Slab Soil Gas Risk Calculators

North Carolina DEQ Risk Calculator
Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
SUB SLAB SS-405
North Carolina Department of Environmental Quality
Risk Calculator
Charlotte, North Carolina
Brownfields
20062-16-060
February 2018
November 2017 EPA RSL Table
Belton Street - David Weekly Homes
11/30/2018
Prepared By:Cameron Moore
Hart & Hickman, PC
Trinh DeSa
North Carolina DEQ Risk Calculator
Table of Contents
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Unit ID: SUB SLAB SS-405
Form No.
Input Form 1A Complete Exposure Pathways
Input Form 1B Exposure Factors and Target Risks
Input Form 1C Contaminant Migration Parameters
Input Form 1D Sample Statistics
Input Form 2A Surface Soil Exposure Point Concentration Table
Input Form 2B Subsurface Soil Exposure Point Concentration Table
Input Form 2C Groundwater Exposure Point Concentration Table
Input Form 2D Surface Water Exposure Point Concentration Table
Input Form 2E Soil Gas Exposure Point Concentration Table
Input Form 2F Indoor Air Exposure Point Concentration Table
Output Form 1A Summary of Risk Assessment Output
Output Form 2A Resident Soil Combined Pathways
Output Form 2B Resident Groundwater Combined Pathways
Output Form 2C Non-Residential Worker Soil Combined Pathways
Output Form 2D Non-Residential Worker Groundwater Combined Pathways
Output Form 2E Construction Worker Soil Combined Pathways
Output Form 2F User Defined Soil Combined Pathways
Output Form 2G User Defined Surface Water Combined Pathways
Output Form 3A Resident Groundwater to Indoor Air
Output Form 3B Resident Soil Gas to Indoor Air
Output Form 3C Resident Indoor Air
Output Form 3D Non-Residential Worker Groundwater to Indoor Air
Output Form 3E Non-Residential Worker Soil Gas to Indoor Air
Output Form 3F Non-Residential Worker Indoor Air
Output Form 4A Soil Source to Groundwater POE - Forward Mode
Output Form 4B Groundwater Source to Groundwater POE - Forward Mode
Output Form 4C Soil Source to Surface Water POE - Forward Mode
Output Form 4D Groundwater Source to Surface Water POE - Forward Mode
Output Form 4E Soil Source to Groundwater POE - Backward Mode
Output Form 4F Groundwater Source to Groundwater POE - Backward Mode
Output Form 4G Soil Source to Surface Water POE - Backward Mode
Output Form 4H Groundwater Source to Surface Water POE - Backward Mode
Output Section 4 - Contaminant Migration to Point of Exposure (POE) Worksheets
Output Section 3 - Vapor Intrusion Calculators
TOC
Description
DATA INPUT SHEETS
Check box
if included
Input Section 1 - Exposure Pathways & Parameters
Input Section 2 - Exposure Point Concentrations
DATA OUTPUT SHEETS
Output Section 1 - Summary Output for All Calculators
Output Section 2 - Primary Calculators
North Carolina DEQ Risk Calculator
Complete Exposure Pathways
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Unit ID: SUB SLAB SS-405
Note: Risk output will only be calculated for complete exposure pathways.
Receptor Pathway
Check box if
pathway
complete
Soil Combined Pathways
Groundwater Combined Pathways
Soil Combined Pathways
Groundwater Combined Pathways
Construction Worker Soil Combined Pathways
Soil Combined Pathways
Surface Water Combined Pathways
Groundwater to Indoor Air
Soil Gas to Indoor Air
Indoor Air
Groundwater to Indoor Air
Soil Gas to Indoor Air
Indoor Air
Source Soil
Source Groundwater
Source Soil
Source Groundwater
Resident
Non-Residential Worker
CONTAMINANT MIGRATION PATHWAYS
Protection of Groundwater Use
Protection of Surface Water
Input Form 1A
VAPOR INTRUSION PATHWAYS
PRIMARY PATHWAYS
Resident
Non-Residential Worker
User Defined
North Carolina DEQ Risk Calculator
Exposure Factors and Target Risks
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Parameter Site Specific Value Justification
Target Cancer Risk (individual)1.0E-06
Target Cancer Risk (cumulative)1.0E-04
Target Hazard Index (individual)2.0E-01
Target Hazard Index (cumulative)1.0E+00
Lifetime (LT) (years)70
Body Weight (BW) (kg)15
Exposure Duration (ED) (yr)6
Exposure Frequency (EF) (d/yr)350
Exposure Time (ET) (hr)24
Skin Surface Area - Soil Exposure (SAs) (cm2)2373
Soil Adherence Factor (AF) (mg/cm2)0.2
Soil Ingestion Rate (IRS) (mg/day)200
Skin Surface Area - Water Exposure (SAw) (cm2)6365
Water Ingestion Rate (IRW) (L/d)0.78
Water Exposure Time (ETevent) (hr/event)0.54
Water Event Frequency (EV) (events/day)1
Lifetime (LT) (years)70
Body Weight (BW) (kg)80
Exposure Duration (ED) (yr)20
Exposure Frequency (EF) (d/yr)350
Exposure Time (ET) (hr)24
Skin Surface Area - Soil Exposure (SAs) (cm2)6032
Soil Adherence Factor (AF) (mg/cm2)0.07
Soil Ingestion Rate (IRS) (mg/day)100
Skin Surface Area - Water Exposure (SAw) (cm2)19652
Water Ingestion Rate (IRW) (L/d)2.5
Water Exposure Time (ETevent) (hr/event)0.71
Water Event Frequency (EV) (events/day)1
Lifetime (LT) (years)70
Body Weight (BW) (kg)80
Exposure Duration (ED) (yr)25
Exposure Frequency (EF) (d/yr)250
Exposure Time (ET) (hr)8
Skin Surface Area - Soil Exposure (SAs) (cm2)3527
Soil Adherence Factor (AF) (mg/cm2)0.12
Soil Ingestion Rate (IR) (mg/day)100
Skin Surface Area - Water Exposure (SAw) (cm2)19652
Water Ingestion Rate (IRW) (L/d)0.83
Water Exposure Time (ETevent) (hr/event)0.67
Water Event Frequency (EV) (events/day)1
Lifetime (LT) (years)70
Body Weight (BW) (kg)80
Working Weeks (EW) (wk/yr)50
Exposure Duration (ED) (yr)1
Exposure Frequency (EF) (d/yr)250
Exposure Time (ET) (hr)8
Skin Surface Area - Soil Exposure (SAs) (cm2)3527
Soil Adherence Factor (AF) (mg/cm2)0.3
Soil Ingestion Rate (IR) (mg/day)330
Non-Residential Worker
Construction Worker
70
80
25
250
8
3527
0.12
100
19652
0.83
0.67
Input Form 1B
Exposure Unit ID: SUB SLAB SS-405
Residential Child
General
Residential Adult
Default Value
1.0E-06
1.0E-04
2.0E-01
1.0E+00
70
15
6
350
24
2373
0.2
200
6365
0.78
0.54
1
70
80
20
350
24
6032
0.07
100
19652
2.5
0.71
1
1
70
80
330
1
250
8
3527
0.3
50
North Carolina DEQ Risk Calculator
Exposure Factors and Target Risks
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Parameter Site Specific Value Justification
Input Form 1B
Exposure Unit ID: SUB SLAB SS-405
Default Value
Recreator Trespasser
Lifetime (LT) (years)70 NA 70
Averaging Time (AT) (days/yr)365 NA 365
Body Weight (BW) (kg)15 NA 15
Exposure Duration 0-2 (ED) (yr)2 NA 2
Exposure Duration 2-6 (ED) (yr)4 NA 4
Exposure Frequency (EF) (d/yr)195 NA 195
Exposure Time (ET) (hr)2 NA 2
Skin Surface Area - Soil Exposure (SAs) (cm2)2373 NA 2373
Soil Adherence Factor (AF) (mg/cm2)0.2 NA 0.2
Soil Ingestion Rate (IRS) (mg/day)200 NA 200
Skin Surface Area - Water Exposure (SAw) (cm2)6365 NA 6365
Water Ingestion Rate (IRW) (L/hr)0.12 NA 0.12
Water Exposure Time (ETevent) (hr/event)2 NA 2
Water Event Frequency (EV) (events/day)1 NA 1
Recreator Trespasser
Lifetime (LT) (years)70 70 70
Body Weight (BW) (kg)80 45 80
Exposure Duration 6-16 (ED) (yr)10 10 10
Exposure Duration 16-26 (ED) (yr)10 0 10
Exposure Frequency (EF) (d/yr)195 90 195
Exposure Time (ET) (hr)2 2 2
Skin Surface Area - Soil Exposure (SAs) (cm2)6032 6032 6032
Soil Adherence Factor (AF) (mg/cm2)0.07 0.2 0.07
Soil Ingestion Rate (IRS) (mg/day)100 200 100
Skin Surface Area - Water Exposure (SAw) (cm2)19652 19652 19652
Water Ingestion Rate (IRW) (L/hr)0.071 0.071 0.071
Water Exposure Time (ETevent) (hr/event)2 2 2
Water Event Frequency (EV) (events/day)1 1 1
User Defined Child
User Defined Adult
North Carolina DEQ Risk Calculator
Exposure Point Concentrations
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Unit ID: SUB SLAB SS-405
Note: Chemicals highlighted in orange are non-volatile chemicals. Since these chemicals do not pose a vapor intrusion risk, no risk values are calculated for these chemicals.
Exposure Point
Concentration
(ug/m3)
Justification for Exposure Point
Concentration CAS Number Chemical
Minimum
Concentration
(Qualifier)
Maximum
Concentration
(Qualifier)
Units
Location of
Maximum
Concentration
Detection
Frequency
Range of
Detection
Limits
Concentration
Used for
Screening
Background
Value
Screening
Toxicity Value
(Screening
Level) (n/c)
Potential
ARAR/TBC
Value
Potential
ARAR/TBC
Source
COPC Flag
(Y/N)
Rationale for
Selection or
Deletion
460 Table 1 67-64-1 Acetone ug/m3
3.1 Table 1 67-66-3 Chloroform ug/m3
2.5 Table 1 75-71-8 Dichlorodifluoromethane ug/m3
1100 Table 1 109-99-9 ~Tetrahydrofuran ug/m3
1200 Table 1 78-93-3 Methyl Ethyl Ketone (2-Butanone)ug/m3
1.3 Table 1 75-09-2 Methylene Chloride ug/m3
3.2 Table 1 108-88-3 Toluene ug/m3
1.4 Table 1 75-69-4 Trichlorofluoromethane ug/m3
Input Form 2E
Soil Gas Exposure Point Concentration Table
North Carolina DEQ Risk Calculator
Summary of Risk Assessment Output Output Form 1A
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Unit ID: SUB SLAB SS-405
Receptor Pathway Carcinogenic
Risk Hazard Index Risk exceeded?
Soil Combined Pathways NC NC NC
Groundwater Combined Pathways*NC NC NC
Soil Combined Pathways NC NC NC
Groundwater Combined Pathways*NC NC NC
Construction Worker Soil Combined Pathways NC NC NC
Soil Combined Pathways NC NC NC
Surface Water Combined Pathways*NC NC NC
Receptor Pathway Carcinogenic
Risk Hazard Index Risk exceeded?
Groundwater to Indoor Air NC NC NC
Soil Gas to Indoor Air 0.0E+00 2.3E-02 NO
Indoor Air NC NC NC
Groundwater to Indoor Air NC NC NC
Soil Gas to Indoor Air 5.8E-08 1.9E-03 NO
Indoor Air NC NC NC
Pathway Source
Source Soil NC
Source Groundwater NC
Source Soil NC
Source Groundwater NC
2. * = If concentrations in groundwater exceed the NC 2L Standards or IMAC, or concentrations in surface water exceed
the NC 2B Standards, appropriate remediation and/or institutional control measures will be necessary to be eligible for a
risk-based closure.
Protection of Surface Water Exceedence of 2B at POE?
Exceedence of 2B at POE?
VAPOR INTRUSION CALCULATORS
Resident
Non-Residential Worker
CONTAMINANT MIGRATION CALCULATORS
Target POE Concentrations Exceeded?
Protection of Groundwater Use Exceedence of 2L at POE?
Exceedence of 2L at POE?
1. If lead concentrations were entered in the exposure point concentration tables, see the individual calculator sheets for
lead concentrations in comparison to screening levels. Note that lead is not included in cumulative risk calculations.
Notes:
PRIMARY CALCULATORS
Resident
Non-Residential Worker
User Defined
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Unit ID: SUB SLAB SS-405
CAS #Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 460 13.8 -6.5E+03 4.3E-04
75-15-0 Carbon Disulfide -1.5E+02
100-41-4 Ethylbenzene 1.1E+00 2.1E+02
109-99-9 ~Tetrahydrofuran 1100 33 -4.2E+02 1.6E-02
142-82-5 Heptane, N--8.3E+01
110-54-3 Hexane, N--1.5E+02
67-63-0 Isopropanol -4.2E+01
78-93-3 Methyl Ethyl Ketone (2-Butanone)1200 36 -1.0E+03 6.9E-03
91-20-3 ~Naphthalene 8.3E-02 6.3E-01
100-42-5 Styrene -2.1E+02
127-18-4 Tetrachloroethylene 1.1E+01 8.3E+00
108-88-3 Toluene 3.2 0.096 -1.0E+03 1.8E-05
75-69-4 Trichlorofluoromethane 1.4 0.042 --
95-63-6 Trimethylbenzene, 1,2,4--1.3E+01
108-38-3 Xylene, m--2.1E+01
95-47-6 Xylene, o--2.1E+01
Cumulative:0.0E+00 2.3E-02
All concentrations are in ug/m3
Output Form 3B
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.
North Carolina DEQ Risk Calculator
Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
SUB SLAB SS-407
North Carolina Department of Environmental Quality
Risk Calculator
Charlotte, North Carolina
Brownfields
20062-16-060
February 2018
November 2017 EPA RSL Table
Belton Street - David Weekly Homes
11/30/2018
Prepared By:Cameron Moore
Hart & Hickman, PC
Trinh DeSa
North Carolina DEQ Risk Calculator
Table of Contents
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Unit ID: SUB SLAB SS-407
Form No.
Input Form 1A Complete Exposure Pathways
Input Form 1B Exposure Factors and Target Risks
Input Form 1C Contaminant Migration Parameters
Input Form 1D Sample Statistics
Input Form 2A Surface Soil Exposure Point Concentration Table
Input Form 2B Subsurface Soil Exposure Point Concentration Table
Input Form 2C Groundwater Exposure Point Concentration Table
Input Form 2D Surface Water Exposure Point Concentration Table
Input Form 2E Soil Gas Exposure Point Concentration Table
Input Form 2F Indoor Air Exposure Point Concentration Table
Output Form 1A Summary of Risk Assessment Output
Output Form 2A Resident Soil Combined Pathways
Output Form 2B Resident Groundwater Combined Pathways
Output Form 2C Non-Residential Worker Soil Combined Pathways
Output Form 2D Non-Residential Worker Groundwater Combined Pathways
Output Form 2E Construction Worker Soil Combined Pathways
Output Form 2F User Defined Soil Combined Pathways
Output Form 2G User Defined Surface Water Combined Pathways
Output Form 3A Resident Groundwater to Indoor Air
Output Form 3B Resident Soil Gas to Indoor Air
Output Form 3C Resident Indoor Air
Output Form 3D Non-Residential Worker Groundwater to Indoor Air
Output Form 3E Non-Residential Worker Soil Gas to Indoor Air
Output Form 3F Non-Residential Worker Indoor Air
Output Form 4A Soil Source to Groundwater POE - Forward Mode
Output Form 4B Groundwater Source to Groundwater POE - Forward Mode
Output Form 4C Soil Source to Surface Water POE - Forward Mode
Output Form 4D Groundwater Source to Surface Water POE - Forward Mode
Output Form 4E Soil Source to Groundwater POE - Backward Mode
Output Form 4F Groundwater Source to Groundwater POE - Backward Mode
Output Form 4G Soil Source to Surface Water POE - Backward Mode
Output Form 4H Groundwater Source to Surface Water POE - Backward Mode
Output Section 4 - Contaminant Migration to Point of Exposure (POE) Worksheets
Output Section 3 - Vapor Intrusion Calculators
TOC
Description
DATA INPUT SHEETS
Check box
if included
Input Section 1 - Exposure Pathways & Parameters
Input Section 2 - Exposure Point Concentrations
DATA OUTPUT SHEETS
Output Section 1 - Summary Output for All Calculators
Output Section 2 - Primary Calculators
North Carolina DEQ Risk Calculator
Complete Exposure Pathways
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Unit ID: SUB SLAB SS-407
Note: Risk output will only be calculated for complete exposure pathways.
Receptor Pathway
Check box if
pathway
complete
Soil Combined Pathways
Groundwater Combined Pathways
Soil Combined Pathways
Groundwater Combined Pathways
Construction Worker Soil Combined Pathways
Soil Combined Pathways
Surface Water Combined Pathways
Groundwater to Indoor Air
Soil Gas to Indoor Air
Indoor Air
Groundwater to Indoor Air
Soil Gas to Indoor Air
Indoor Air
Source Soil
Source Groundwater
Source Soil
Source Groundwater
Resident
Non-Residential Worker
CONTAMINANT MIGRATION PATHWAYS
Protection of Groundwater Use
Protection of Surface Water
Input Form 1A
VAPOR INTRUSION PATHWAYS
PRIMARY PATHWAYS
Resident
Non-Residential Worker
User Defined
North Carolina DEQ Risk Calculator
Exposure Factors and Target Risks
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Parameter Site Specific Value Justification
Target Cancer Risk (individual)1.0E-06
Target Cancer Risk (cumulative)1.0E-04
Target Hazard Index (individual)2.0E-01
Target Hazard Index (cumulative)1.0E+00
Lifetime (LT) (years)70
Body Weight (BW) (kg)15
Exposure Duration (ED) (yr)6
Exposure Frequency (EF) (d/yr)350
Exposure Time (ET) (hr)24
Skin Surface Area - Soil Exposure (SAs) (cm2)2373
Soil Adherence Factor (AF) (mg/cm2)0.2
Soil Ingestion Rate (IRS) (mg/day)200
Skin Surface Area - Water Exposure (SAw) (cm2)6365
Water Ingestion Rate (IRW) (L/d)0.78
Water Exposure Time (ETevent) (hr/event)0.54
Water Event Frequency (EV) (events/day)1
Lifetime (LT) (years)70
Body Weight (BW) (kg)80
Exposure Duration (ED) (yr)20
Exposure Frequency (EF) (d/yr)350
Exposure Time (ET) (hr)24
Skin Surface Area - Soil Exposure (SAs) (cm2)6032
Soil Adherence Factor (AF) (mg/cm2)0.07
Soil Ingestion Rate (IRS) (mg/day)100
Skin Surface Area - Water Exposure (SAw) (cm2)19652
Water Ingestion Rate (IRW) (L/d)2.5
Water Exposure Time (ETevent) (hr/event)0.71
Water Event Frequency (EV) (events/day)1
Lifetime (LT) (years)70
Body Weight (BW) (kg)80
Exposure Duration (ED) (yr)25
Exposure Frequency (EF) (d/yr)250
Exposure Time (ET) (hr)8
Skin Surface Area - Soil Exposure (SAs) (cm2)3527
Soil Adherence Factor (AF) (mg/cm2)0.12
Soil Ingestion Rate (IR) (mg/day)100
Skin Surface Area - Water Exposure (SAw) (cm2)19652
Water Ingestion Rate (IRW) (L/d)0.83
Water Exposure Time (ETevent) (hr/event)0.67
Water Event Frequency (EV) (events/day)1
Lifetime (LT) (years)70
Body Weight (BW) (kg)80
Working Weeks (EW) (wk/yr)50
Exposure Duration (ED) (yr)1
Exposure Frequency (EF) (d/yr)250
Exposure Time (ET) (hr)8
Skin Surface Area - Soil Exposure (SAs) (cm2)3527
Soil Adherence Factor (AF) (mg/cm2)0.3
Soil Ingestion Rate (IR) (mg/day)330
Non-Residential Worker
Construction Worker
70
80
25
250
8
3527
0.12
100
19652
0.83
0.67
Input Form 1B
Exposure Unit ID: SUB SLAB SS-407
Residential Child
General
Residential Adult
Default Value
1.0E-06
1.0E-04
2.0E-01
1.0E+00
70
15
6
350
24
2373
0.2
200
6365
0.78
0.54
1
70
80
20
350
24
6032
0.07
100
19652
2.5
0.71
1
1
70
80
330
1
250
8
3527
0.3
50
North Carolina DEQ Risk Calculator
Exposure Factors and Target Risks
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Parameter Site Specific Value Justification
Input Form 1B
Exposure Unit ID: SUB SLAB SS-407
Default Value
Recreator Trespasser
Lifetime (LT) (years)70 NA 70
Averaging Time (AT) (days/yr)365 NA 365
Body Weight (BW) (kg)15 NA 15
Exposure Duration 0-2 (ED) (yr)2 NA 2
Exposure Duration 2-6 (ED) (yr)4 NA 4
Exposure Frequency (EF) (d/yr)195 NA 195
Exposure Time (ET) (hr)2 NA 2
Skin Surface Area - Soil Exposure (SAs) (cm2)2373 NA 2373
Soil Adherence Factor (AF) (mg/cm2)0.2 NA 0.2
Soil Ingestion Rate (IRS) (mg/day)200 NA 200
Skin Surface Area - Water Exposure (SAw) (cm2)6365 NA 6365
Water Ingestion Rate (IRW) (L/hr)0.12 NA 0.12
Water Exposure Time (ETevent) (hr/event)2 NA 2
Water Event Frequency (EV) (events/day)1 NA 1
Recreator Trespasser
Lifetime (LT) (years)70 70 70
Body Weight (BW) (kg)80 45 80
Exposure Duration 6-16 (ED) (yr)10 10 10
Exposure Duration 16-26 (ED) (yr)10 0 10
Exposure Frequency (EF) (d/yr)195 90 195
Exposure Time (ET) (hr)2 2 2
Skin Surface Area - Soil Exposure (SAs) (cm2)6032 6032 6032
Soil Adherence Factor (AF) (mg/cm2)0.07 0.2 0.07
Soil Ingestion Rate (IRS) (mg/day)100 200 100
Skin Surface Area - Water Exposure (SAw) (cm2)19652 19652 19652
Water Ingestion Rate (IRW) (L/hr)0.071 0.071 0.071
Water Exposure Time (ETevent) (hr/event)2 2 2
Water Event Frequency (EV) (events/day)1 1 1
User Defined Child
User Defined Adult
North Carolina DEQ Risk Calculator
Exposure Point Concentrations
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Unit ID: SUB SLAB SS-407
Note: Chemicals highlighted in orange are non-volatile chemicals. Since these chemicals do not pose a vapor intrusion risk, no risk values are calculated for these chemicals.
Exposure Point
Concentration
(ug/m3)
Justification for Exposure Point
Concentration CAS Number Chemical
Minimum
Concentration
(Qualifier)
Maximum
Concentration
(Qualifier)
Units
Location of
Maximum
Concentration
Detection
Frequency
Range of
Detection
Limits
Concentration
Used for
Screening
Background
Value
Screening
Toxicity Value
(Screening
Level) (n/c)
Potential
ARAR/TBC
Value
Potential
ARAR/TBC
Source
COPC Flag
(Y/N)
Rationale for
Selection or
Deletion
130 Table 1 67-64-1 Acetone ug/m3
3.3 Table 1 67-66-3 Chloroform ug/m3
550 Table 1 109-99-9 ~Tetrahydrofuran ug/m3
150 Table 1 78-93-3 Methyl Ethyl Ketone (2-Butanone)ug/m3
1.3 Table 1 75-69-4 Trichlorofluoromethane ug/m3
Input Form 2E
Soil Gas Exposure Point Concentration Table
North Carolina DEQ Risk Calculator
Summary of Risk Assessment Output Output Form 1A
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Unit ID: SUB SLAB SS-407
Receptor Pathway Carcinogenic
Risk Hazard Index Risk exceeded?
Soil Combined Pathways NC NC NC
Groundwater Combined Pathways*NC NC NC
Soil Combined Pathways NC NC NC
Groundwater Combined Pathways*NC NC NC
Construction Worker Soil Combined Pathways NC NC NC
Soil Combined Pathways NC NC NC
Surface Water Combined Pathways*NC NC NC
Receptor Pathway Carcinogenic
Risk Hazard Index Risk exceeded?
Groundwater to Indoor Air NC NC NC
Soil Gas to Indoor Air 8.1E-07 9.9E-03 NO
Indoor Air NC NC NC
Groundwater to Indoor Air NC NC NC
Soil Gas to Indoor Air 6.2E-08 1.5E-04 NO
Indoor Air NC NC NC
Pathway Source
Source Soil NC
Source Groundwater NC
Source Soil NC
Source Groundwater NC
2. * = If concentrations in groundwater exceed the NC 2L Standards or IMAC, or concentrations in surface water exceed
the NC 2B Standards, appropriate remediation and/or institutional control measures will be necessary to be eligible for a
risk-based closure.
Protection of Surface Water Exceedence of 2B at POE?
Exceedence of 2B at POE?
VAPOR INTRUSION CALCULATORS
Resident
Non-Residential Worker
CONTAMINANT MIGRATION CALCULATORS
Target POE Concentrations Exceeded?
Protection of Groundwater Use Exceedence of 2L at POE?
Exceedence of 2L at POE?
1. If lead concentrations were entered in the exposure point concentration tables, see the individual calculator sheets for
lead concentrations in comparison to screening levels. Note that lead is not included in cumulative risk calculations.
Notes:
PRIMARY CALCULATORS
Resident
Non-Residential Worker
User Defined
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Version Date: February 2018
Basis: November 2017 EPA RSL Table
Site ID: 20062-16-060
Exposure Unit ID: SUB SLAB SS-407
CAS #Chemical Name:
Soil Gas
Concentration
(ug/m3)
Calculated
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
67-64-1 Acetone 130 3.9 -6.5E+03 1.2E-04
71-43-2 Benzene 3.6E-01 6.3E+00
75-15-0 Carbon Disulfide -1.5E+02
67-66-3 Chloroform 3.3 0.099 1.2E-01 2.0E+01 8.1E-07 9.7E-04
100-41-4 Ethylbenzene 1.1E+00 2.1E+02
109-99-9 ~Tetrahydrofuran 550 16.5 -4.2E+02 7.9E-03
142-82-5 Heptane, N--8.3E+01
110-54-3 Hexane, N--1.5E+02
67-63-0 Isopropanol -4.2E+01
78-93-3 Methyl Ethyl Ketone (2-Butanone)150 4.5 -1.0E+03 8.6E-04
91-20-3 ~Naphthalene 8.3E-02 6.3E-01
100-42-5 Styrene -2.1E+02
127-18-4 Tetrachloroethylene 1.1E+01 8.3E+00
108-88-3 Toluene -1.0E+03
95-63-6 Trimethylbenzene, 1,2,4--1.3E+01
108-67-8 Trimethylbenzene, 1,3,5--1.3E+01
108-38-3 Xylene, m--2.1E+01
95-47-6 Xylene, o--2.1E+01
Cumulative:8.1E-07 9.9E-03
All concentrations are in ug/m3
Output Form 3B
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Since these chemicals do not pose a vapor intrusion
risk, no risk values are calculated for these chemicals.