21007_Hoke Street_VIR_20180108

VAPOR INTRUSION SOIL GAS SAMPLING REPORT
PASSAGE HOME SITE
500 HOKE STREET, RALEIGH, NORTH CAROLINA
RDHEC PROJECT NO. 1735.00

Prepared for:

Aptus Management, PLLC
109 Amber Court
Carrboro, NC 27510

Prepared by:

RDH Environmental Consulting
4012 Ridgebrook Bluffs Drive
Raleigh, North Carolina 27603
[phone]

January 8, 2018
4012 Ridgebrook Bluffs Dr. Raleigh, NC 27603 [phone]
[e-mail] January 8, 2018

John Gallagher
Aptus Management, PLLC
109 Amber Court
Carrboro, North Carolina 27510

Subject: VAPOR INTRUSION SOIL GAS SAMPLING REPORT
PASSAGE HOME SITE – 500 HOKE STREET, RALEIGH, NORTH CAROLINA
NCBF PROJECT NO: 21007-17-092
RDHEC PROJECT NO. 1735.00

Dear Mr. Gallagher:

RDH Environmental Consulting (RDHEC) is pleased to provide the enclosed report for the vapor
intrusion (VI) sampling that was conducted at the above-referenced site on October 17, 2017.
The project was performed in accordance with the terms and conditions of RDHEC Proposal No.
P1732 dated July 13, 2017, which was authorized by your email on July 17, 2017.

The sampling was completed in general accordance with the work plan prepared by RDHEC on
August 11, 2017, which was submitted via email by Aptus Management, PLLC (Aptus) to Sarah
Hardison of the NCDEQ Brownfields Program on August 28, 2017. The work plan was revised on
October 9, 2017, based on comments from Ms. Hardison on September 26, 2017, and approved
on October 11, 2017.

The findings from the sampling indicated minimal detections of various volatile organic
compounds (VOCs) at each of the sampling locations except one analyte. Tetrachloroethylene
(PCE) at the southwest building quadrant sample location (SS-3) was the only analyte detected
at a concentration greater than the NC residential soil gas screening level (NCRSGSL). A risk
assessment performed using the October 2017 NCDEQ’s Risk Calculator showed the cumulative
risk from vapor intrusion acceptable. Moreover, the PCE concentration was well below the non-
residential NCSGSL.

Given that the building’s floor thickness was 6.5- to 8-inches thick and the site will employ a
commercial grade heating, ventilating, and air conditioning (HVAC) system that increases air
exchange rates compared to residential properties, the resulting attenuation should be greater
than the conservative default values used to set the residential soil gas screening levels.

Nevertheless, given the future use of the site may be a community center with children present,
we recommend conducting indoor air quality testing to confirm that PCE is below acceptable
guideline levels.
TABLE OF CONTENTS

1.0 INTRODUCTION ...................................................................................................... 1
2.0 TESTING SUMMARY ................................................................................................ 1
3.0 SOIL GAS SAMPLING RESULTS .................................................................................. 3
4.0 RISK ASSESSMENT .................................................................................................. 4
5.0 CONCLUSIONS/RECOMMENDATIONS ...................................................................... 4
6.0 CLOSING ................................................................................................................ 5

TABLES

Boring/Slab Details at Sampling Locations ..................................................................................... 2
Shut-In Test / Leak Check Details During Sampling ........................................................................ 3
Post-Sampling Leak Check Details .................................................................................................. 3
Table 1 - Laboratory Results from Sub-Slab Soil Gas Sampling on 10/17/2017 ............ Attachment

DRAWINGS

1 Site Location Map
2 Facility Site Plan
3 Proposed Soil Gas Sampling Locations (From Work Plan)
4 Soil Gas Sampling Locations/Results

APPENDICES

Appendix A October 11, 2017 Approved Sampling Work Plan
Appendix B Photographs
Appendix C NCDWM Residential Vapor Intrusion Screening Levels Table (October 2017)
Appendix D Laboratory Report and Chain of Custody Form
Appendix E NCDEQ’s Risk Calculator Results

4012 Ridgebrook Bluffs Dr. Raleigh, NC 27603 [phone] [e-mail]

1.0 INTRODUCTION

Hoke Street PH Redevelopment LLC is pursuing a Brownfields Agreement (No. 21007-17-092)
that will include use of the existing 14,500-square foot building as a new Passage Home
property, located at 500 Hoke Street in Raleigh, NC (see Drawing 1 – Site Location Map and
Drawing 2 – Facility Site Map, attached). Passage Home provides aid and human service
assistance to local families in need. Consequently, the development is considered residential
use due to the potential presence of children. Because of past industrial use of the building, the
North Carolina Division of Environmental Quality (NCDEQ) Division of Waste Management
(NCDWM) Brownfields Program requested that sub-slab soil gas sampling be performed to
determine potential VI risk. This report summarizes the VI testing activities that were
conducted in accordance with a Brownfields-approved work plan, as well as the laboratory
results and conclusions.

RDHEC conducted the vapor intrusion (VI) sampling on October 17, 2017. The testing involved
collection of five (5) sub-slab soil gas canister samples from four quadrant locations across the
building footprint. One of the locations, SS-1, included a duplicate sample, per the work plan
and in accordance with DWM VI guidance1. The proposed soil gas sampling locations are shown
in Drawing 3 from the work plan (a copy of the approved work plan is included in Appendix A).
The actual sampling locations, with measurements and tabulated laboratory results for
tetrachloroethylene (PCE), are provided in Drawing 4. Photographs from the day of the
sampling are included in Appendix B. The NCDWM Residential Vapor Intrusion Screening Levels
Table (October 2017) and Laboratory Report and Chain of Custody Form are provided in
Appendices C and D, respectively. Printouts from the NCDEQ’s Risk Calculator Results, discussed
later, are provided in Appendix E.

2.0 TESTING SUMMARY

RDHEC arrived at the site at 1:00 pm on October 17, 2017. Upon entering the building, a
measuring wheel was used to mark the locations on the slab where Vapor Pins® would be set as
sampling probes and a TSI IAQ-Calc monitor was started to log temperature and relative humidity
conditions during the sampling. The sample probes were placed in general accordance with the
proposed locations shown in Drawing 3 from the work plan.

Meteorological conditions during the sampling included clear and sunny skies with little to no winds.
Temperatures during the testing ranged from 67.0 to 72.7 °F (average = 71.5 °F) and the relative
humidity ranged from 32.7 to 53.9% (average = 48.4), as indicated by logs from the portable
monitor. According to nearby weather stations, barometric pressure was steady, dropping slowly
from 30.29 to 30.26 inches during the testing. A short rain event of approximately 0.22 to 0.25 inches

1 NCDEQ DWM VAPOR INTRUSION GUIDANCE document dated April 2014, page 30.
Vapor Intrusion Soil Gas Sampling Report January 8, 2018
Passage Home Site – 500 Hoke Street Page 2
Raleigh, North Carolina

occurred nearby (6 blocks to the north of the site) 24 hours prior to testing on October 16th. Prior to
that, a 0.6-inch rain occurred on October 11th.Thus, there was no significant precipitation within 12
hours prior to (or during) the sampling event to induce pressure gradients that might affect soil
vapor intrusion.

A hammer drill was used to create 5/8-inch diameter borings at the each of the four sample
locations. Details regarding each boring are noted in the table below.

Boring/Slab Details at Sampling Locations

Sample Location SS-1 SS-2 SS-3 SS-4
Boring Depth 9.5” 11.5” 9” 10.25”
Sub-Slab Thickness 6.5” 7” 7.5” 8”
Sub-Slab Conditions
Hard-packed
soil/clay, no stone
or gravel fill
beneath
Hard-packed
soil/clay, no stone
or gravel fill
beneath
Hard-packed
soil/clay, no
stone or gravel
fill beneath
Hard-packed
soil/clay, no stone
or gravel fill
beneath

Vapor Pins® fitted with silicone sleeves were secured into each boring using a special tool and
rubber hammer. Per the work plan, the probe locations were allowed to equilibrate for at least
20 minutes prior to connecting the sampling trains.

The samples were collected using 1/4-inch rigid Teflon tubing and 400-mL Summa canisters.
Small 1- to 2-inch pieces of 1/4-inch and 3/8- inch silicone tubing were employed to make
connections to various valves and fittings of the sampling trains. Tubing was connected to the
barbed fitting of the Vapor Pins, routed through a plastic shroud (which was placed over the
probe site) and the other end connected to a 3-way valve and 60-milliliter (mL) syringe to form a
sampling train for each sample location.

The SS-1 sample location employed an inline tee to collect a duplicate sample for quality
assurance purposes, in accordance with Brownfields Program guidance, for a total of five (5) soil
gas samples/analyses.

Shut-in tests were performed to ensure air tight conditions at each location. Per the work plan,
once the sampling train was deemed leak-free, the probe tubing was purged of three dead
volumes using a 60-mL syringe and leak checked while the shroud was filled with helium. With
1.5 feet of 1/4-Inch tubing (inner diameter of 0.177 inches), three dead volumes equaled 22 mL.
(Note – approximately 120 mLs were purged to allow for sufficient volume for the helium leak
checks, described below).

The helium concentrations within the shroud were measured and noted using a MGD-2002 leak
detector. The purged soil gas was collected into a 0.5-L Tedlar bag. After purging, the Tedlar bag
was removed and the contents monitored for helium levels. A successful leak check was deemed
when the purged soil gas contains less than 5% of the initial shroud concentration of helium. Each
Vapor Intrusion Soil Gas Sampling Report January 8, 2018
Passage Home Site – 500 Hoke Street Page 3
Raleigh, North Carolina

of the purged helium concentrations were 0 ppm, therefore leak-free conditions were achieved
and no adjustments were necessary.

Shut-In Test / Helium (He) Leak Check Details During Sampling

Sample Location SS-1 SS-2 SS-3 SS-4
Maintained Shut-In Vacuum
(5-Min Duration) -21” Hg -22” Hg -17” Hg -17” Hg
Shroud He Concentration
(%/ppm)
48.6% /
486,000 ppm
42.6% /
426,000 ppm
36.8% /
368,000 ppm
51.1% /
511,000 ppm
Purge He Concentration
(ppm) 0 ppm 0 ppm 0 ppm 0 ppm

Each of soil gas samples was collected using 400-mL canisters fitted with 200 ml/min flow
regulators over a period of approximately two minutes. Following completion of the sampling,
post-sampling leak checks were performed again at each location using helium. After a successful
post-sampling leak check, the probe tubing and Vapor Pins® were removed from each location
and the borings were grouted flush to the slab foundation with cement.

Post-Sampling Leak Check Details

Sample Location SS-1 SS-2 SS-3 SS-4
Shroud He Concentration
(%/ppm)
30.1% /
301,000 ppm
29.5% /
295,000 ppm
25.9%
259,000 ppm
48.0%
480,000 ppm
Purge He Concentration
(ppm) 0 ppm 0 ppm 0 ppm 0 ppm

The laboratory analysis request forms were then completed for laboratory analysis using EPA
Compendium Method TO-15 "Determination of Volatile Organic Compounds (VOCs) in Air
Collected in Specially-Prepared Canisters and Analyzed by Gas Chromatography/Mass
Spectrometry (GC/MS)" and the canisters were placed back in the laboratory packaging for return
shipment. Since post-sampling leak checks were conducted, helium analysis by the laboratory
was not required. The samples were then shipped to the lab under proper chain of custody.

For this project, the full TO-15 analyte list was requested.

3.0 SOIL GAS SAMPLING RESULTS

The results of the EPA Method TO-15 laboratory analyses were compared to the NCDEQ’s
October 2017 list of Residential Vapor Intrusion Soil Gas Screening Levels (NCRSGSLs, attached
in Appendix C) upon receipt of the laboratory report (Appendix D). Sample SS-3, located at the
southwest quadrant of the building, exhibited the only detected analyte (PCE) at a
concentration above a NCRSGSL. The remaining analytes among the five samples were each
found to be well below their respective residential soil gas screening level (ranging from 0.01%
to 34.29% of the NCRSGSLs, and averaging only 2.63% of the NCRSGSLs). The results for all
Vapor Intrusion Soil Gas Sampling Report January 8, 2018
Passage Home Site – 500 Hoke Street Page 4
Raleigh, North Carolina

detected analytes are provided in Table 1 (attached) and those of PCE are included on Drawing
4 for quick reference.

Note also that further details are available in the original lab Electronic Data Deliverables (EDD) file
in Excel spreadsheet format was attached to the email containing this report and should be included
with the submittal to the Brownfields Program.

4.0 RISK ASSESSMENT

Since PCE was the sole analyte with a detection above a screening level and the concentration
was less than 10-times the NCRSGSL, a risk assessment was performed using the NCDEQ’s Risk
Calculator (October 2017 version). The highest concentration of each detected analyte amongst
the five samples was input to the model. Based on the risk calculator results, the cumulative
carcinogenic risk was 4.7E-6 and the cumulative hazard index was 0.6 for residential receptors.
Comparatively, for non-residential/commercial receptors, the cumulative carcinogenic risk was
3.6E-7 and the cumulative hazard index was 0.048. This shows that an unacceptable risk from
vapor intrusion is unlikely. Printouts from the Risk Calculator are provided in Appendix E.

5.0 CONCLUSIONS/RECOMMENDATIONS

The findings from this VI sampling study identified several low-level detections of petroleum and
chlorinated hydrocarbons at the site. Except for PCE at the southeast quadrant of the building,
however, the levels were well below the conservative VI screening levels for residential properties.
A risk assessment using the highest levels of detected contaminants indicates that it is unlikely that
the soil gas levels would result in unacceptable risks or exceedances of indoor air quality guidelines.

Given that the building foundation slab was determined to be 1.6 to 2.0 times thicker than typical
(4-inch) residential and commercial slabs, the floor should provide a good barrier to attenuate
migration of VI to the indoors. Additionally, it was noted that the sub-slab is comprised of hard-
packed clay rather than stone/gravel fill. This condition would provide additional barriers to VI to
the indoors from the soil due to limiting the migration of soil gas beneath the slab. Lastly, the
building is a commercial structure with corresponding HVAC systems that should provide greater
fresh air exchange for occupants, further reducing the risk of VI at the site.

In summary, comparison of the soil gas testing results with current NCDWM guidance indicate that
there is not likely to be an unacceptable risk of vapor intrusion at the proposed Passage Home
building.

Nevertheless, given the future use of the site may be a community center with children present, we
recommend conducting indoor air testing to confirm that PCE levels are below acceptable guideline
levels.

Vapor Intrusion Soil Gas Sampling Report January 8, 2018
Passage Home Site – 500 Hoke Street Page 5
Raleigh, North Carolina

6.0 CLOSING

Thank you for allowing RDHEC to be of assistance with your vapor intrusion testing needs. If you
should have questions regarding this submittal or associated documentation, please feel free to
contact us at [phone] at your convenience.

Sincerely,
RDH ENVIRONMENTAL CONSULTING

Robert D. Hill, PE
Principal Consulting Engineer

Attachments

TABLES

SS-1 SS-1 (Dup)SS-2 SS-3 SS-4
Sub-slab and
Exterior
Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05
THQ=0.2
SS-1 SS-1 (Dup)SS-2 SS-3 SS-4
(Oct 2017)
Acetone 97 98 2.20E+05 0.04%0.04%
2-Butanone (MEK)12 13 8.9 6.9 15 3.50E+04 0.03%0.04%0.03%0.02%0.04%
Carbon Tetrachloride 11 1.60E+02 6.88%
Chloroform 3.1 4.10E+01 7.56%
Cyclohexane 6.2 8.5 72 4.20E+04 0.01%0.02%0.17%
Ethanol 43 45 64 94 130 NA ---------------
Ethyl Acetate 2.9 4.90E+02 0.59%
Ethylbenzene 3.1 5.5 7.3 9.1 3.70E+02 0.84%1.49%1.97%2.46%
4-Ethyltoluene 2.3 3 3.8 NA ---------
Heptane 3.8 3.3 9.4 13 200 2.80E+03 0.14%0.12%0.34%0.46%7.14%
Hexane 11 11 28 40 470 4.90E+03 0.22%0.22%0.57%0.82%9.59%
2-Hexanone (MBK)72 2.10E+02 34.29%
Isopropanol 2.1 3.1 3.8 1.40E+03 0.15%0.22%0.27%
Naphthalene 3.7 2.10E+01 17.62%
Propene 6.8 7.1 5.8 5.9 4.6 NA ---------------
Tetrachloroethylene 36 26 24 590 16 2.80E+02 12.86%9.29%8.57%210.71%5.71%
Tetrahydrofuran 1.6 2.6 1.40E+04 0.01%0.02%
Toluene 7.9 6.3 12 17 24 3.50E+04 0.02%0.02%0.03%0.05%0.07%
1,1,1-Trichloroethane 12 3.50E+04 0.03%
Trichlorofluoromethane (Freon 11)3.8 NA ---
1,2,4-Trimethylbenzene 6.5 5.3 7.1 9.4 11 4.20E+02 1.55%1.26%1.69%2.24%2.62%
1,3,5-Trimethylbenzene 4.1 2.3 3.5 4.20E+02 0.98%0.55%0.83%
m&p-Xylene 13 10 20 27 36 7.00E+02 1.86%1.43%2.86%3.86%5.14%
o-Xylene 4.3 3.8 7.1 9.5 13 7.00E+02 0.61%0.54%1.01%1.36%1.86%
Notes:Detections Greater Than NC Residential Soil Gas Screening Level (NCRSGSL) Are Shown In Bold
TABLE 1 - 10/17/2017 SUB-SLAB SOIL GAS TESTING RESULTS
PASSAGE HOME SITE - 500 HOKE STREET, RALEIGH, NORTH CAROLINA
BROWNFIELDS PROJECT NUMBER: 21007-17-092
% of NCRSGSL
Analyte
RDHEC PROJECT NUMBER: 1719.00
Lab Results (ug/m3)

DRAWINGS

APPENDIX A

OCTOBER 11, 2017 APPROVED
SAMPLING WORK PLAN

Aptus Management, PLLC
Environmental Management Solutions

Aptus Management, PLLC
109 Amber Court
Carrboro, NC 27510

October 9, 2017

Sarah Hardison Young VIA EMAIL: [e-mail]
Brownfields Project Manager
NC Division of Waste Management
217 W Jones St.
Raleigh, NC 27603-6100

SUBJECT: VAPOR INTRUSION SUB-SLAB SOIL GAS TESTING – WORK PLAN
PASSAGE HOME SITE – RALEIGH, NORTH CAROLINA
BROWNFIELDS PROJECT NUMBER: 21007-17-092

Dear Ms. Young:

Aptus Management, LLC (Aptus) is pleased to provide this revised work plan for vapor intrusion
(VI) testing at the Passage Home site located at 500 Hoke Street in Raleigh (see Figure 1 below).
This work plan addresses only the vapor intrusion assessment comments for the existing building
noted in your additional assessment letter dated June 27, 2017. This update incorporates your
September 26, 2017 comments to the original work plan dated August 28, 2017. The objectives
are to evaluate potential risks due to vapor intrusion, and to support our redevelopment planning.

Figure 1. Site Location Map – Passage Home Site, 500, 506 Hoke Street
1412 Garner Road – Raleigh, NC (Source: Wake County GIS).

BACKGROUND INFORMATION

Hoke Street PH Redevelopment LLC is pursuing a Brownfields Agreement (No. 21007-17-092). A
site location map is provided in Drawing 1. The site is comprised of the following three parcels (see
Site Map in Drawing 2):
Vapor Intrusion Soil Gas Testing Work Plan October 9, 2017
Passage Home Site - Raleigh, North Carolina

Aptus Management, PLLC Page 2

 500 Hoke Street (Parcel 1703828886)
 506 Hoke Street (Parcel 1703920846)
 1412 Garner Road (Parcel 1703920658)

Due the past industrial use of the on-site building, including waste handling operations by a
company called Nyetech which leased the property in 2003/2004, and known groundwater
pollution conditions in the vicinity, you requested that we evaluate potential risks due to vapor
intrusion (VI). In your letter dated June 27, 2017, you requested a minimum of four (4) sub-slab soil
gas samples within the existing building.

The adaptive reuse of the building is our current focus and redevelopment of the remainder of the
property will be considered later. Therefore, the proposed VI testing is for only the building, and not
the balance of the site.

SAMPLING WORK PLAN

Aptus proposes to collect four (4) sub-slab soil gas samples within the on-site building as shown in
Drawing 3. The sampling locations will follow the suggested approach you outlined in the June 27
letter. The actual locations will be determined in the field based on visual observations, locations of
walls, doors, flooring conditions, etc. The work will be conducted in accordance with guidance1.

Two of the samples will be collected in the western portion of the building where we believe
Nyetech stored waste materials near the outside loading dock as shown in the highlighted area in
the figure below.

Figure 2. Probable 10-Day Storage Area Locations within Site Building,
500 Hoke Street – Raleigh, NC (Source: 1972 Sanborn Map).

1 “Vapor Intrusion Guidance”, NCDENR, Division of Waste Management, Brownfields Program, April
2014.

Vapor Intrusion Soil Gas Testing Work Plan October 9, 2017
Passage Home Site - Raleigh, North Carolina

Aptus Management, PLLC Page 3

The third sampling location will be in the northeastern part of the building near the former fuel
dispenser pad. Lastly, the fourth sample will be located at the southeast area of the building to
provide assessment of the remaining quadrant.

Sample Collection

 Aptus will collect sub-slab soil gas samples from four (4) locations identified as SS-1
through SS-4.
 One location (SS-1) will employ an inline tee to collect a duplicate sample for quality
assurance purposes for a total of five (5) soil gas samples/analyses.
 A hammer drill will be used to bore 5/8-inch diameter holes through the slab to the soil
beneath (approximately 1-foot depth). The hole will be cleaned with a small bristle brush
and vacuumed of residual dust with a shop vac. The thickness of the slab and the depth to
and nature of fill media under the slab will be noted. Vapor Pins® fitted with silicone sleeves
will be secured into each boring using a special tool and rubber hammer.
 Each Vapor Pin location will be allowed to equilibrate for at least 20 minutes.
 The samples will be collected using ¼-inch rigid Teflon tubing and 400-ml Summa
canisters, per the attached H&P Sampling Guide: Collecting Soil Vapor into Summa
Canisters (see Attachment 1). Small 1- to 2-inch pieces of 1/4" and 3/8" Tygon tubing will
be employed to make connections to various valves and fittings of the sampling trains.
Tubing will be connected to the barbed fitting of the Vapor Pins and a 3-way valve and 60-
milliliter (mL) syringe to form a sampling train for each sample location. Dedicated tubing,
fittings, and syringes will be utilized for each sampling point.
 The probe tubing will be connected to the sampling train and a shut-in test will be
performed to ensure air tight conditions per the Sampling Guide. Subsequently, once the
sampling train is deemed leak-free, the probe tubing will be purged of three dead volumes
using a 60-ml syringe and leak checked using helium in accordance with the Soil Vapor
Sampling Using Shroud Method of Leak Detection in Attachment 2. Assuming 1.5 feet of
¼-inch tubing (inner diameter of 0.177 inches), three dead volumes equals 22 mL. (Note -
up to 60 mLs may be purged to ensure sufficient volume for the helium leak check,
described below). The actual purge volume will be calculated to account for the probe
tubing length, sample train and the thickness of the slab. Shut in tests and leak checks of
the sampling trains and probes will be performed at each sample location.
 The helium concentration within the shroud will be measured using a MGD-2002 leak
detector (or equivalent monitor). The purged soil gas will be collected into a 0.5-L Tedlar
bag. After purging, the Tedlar bag will be removed and the contents monitored for helium
levels. A successful leak check is deemed when the purged soil gas contains less than 5%
of the initial shroud concentration of helium. If helium concentrations exceed 5% in the
purged soil gas, adjustments will be made to achieve leak-free conditions and/or a new
Vapor Pin location will be installed and tested.
 If no leaks are detected, the canister sampling can begin at each of the sample locations.
 Each of soil gas samples will be collected using canisters fitted with 100 – 200 ml/min flow
regulators over a period of between two to four minutes.
 A post-sampling leak check will be performed using helium. After a successful post-
sampling leak check, the probe tubing and Vapor Pins will be removed from each location
and the borings will be grouted flush to the slab foundation level with cement.
 Laboratory analysis request forms will be prepared and the samples shipped under
proper chain of custody for analysis using EPA Compendium Method TO-15
“Determination of Volatile Organic Compounds (VOCs) in Air Collected in Specially-
Prepared Canisters and Analyzed by Gas Chromatography/Mass Spectrometry
Vapor Intrusion Soil Gas Testing Work Plan October 9, 2017
Passage Home Site - Raleigh, North Carolina

Aptus Management, PLLC Page 4
(GC/MS)”. (Note – when conducting a post-sampling leak check, helium analysis by the
laboratory is not required.) The lab will be contacted ahead of time to ensure that
reporting limits will be below applicable residential screening levels. The chain of
custody/sample analysis forms will Include vacuum readings (initial and final) during
testing and the lab will report the received vacuum on the form. Sampling will be stopped
when a residual vacuum of 3 to 5 inches of mercury (Hg) is reached for each canister
(i.e., sampling will be monitored closely to ensure that final vacuum does not reach 0
inches of Hg.)

REPORTING

Upon receipt of the laboratory results, the concentrations will be compared to the Division of Waste
Management’s (DWM’s) residential soil gas screening levels (RSGSLs). A written report will be
prepared summarizing our field activities, observations, laboratory results, conclusions and
recommendations. The field readings for the shut in test, helium leak check and helium readings,
and vacuum readings will be included. The findings and conclusions will be used to develop the
recommendations regarding the risk of vapor intrusion.

CLOSING

If you have questions regarding this submittal or associated documentation, please feel free to
contact us at [phone] at your convenience.

Sincerely,
APTUS MANAGEMENT, PLLC

John Gallagher, PE Robert D. Hill, PE
Engineer of Record Principal Consulting Engineer

Attachments

Aptus Management, PLLC
DRAWINGS
SITE
SITE PARCEL /PROPERTY BOUNDARYADJACENT PARCEL /PROPERTY BOUNDARIESLEGENDFORMERASHLANDCHEMICALFACILITYAUTO REPAIRSERVICEFACILITYSITE - EXISTING BUILDING(500 HOKE STREET)
SS-1SUB-SLAB SOIL GASSAMPLE LOCATIONPARCEL / PROPERTYBOUNDARIESLEGENDPOSSIBLE FUELDISPENSER PADAREASOUTHWEST BUILDINGSAMPLE LOCATION(NEAR FORMER ASHLANDCHEMICAL SITE & POSSIBLE10-DAY STORAGE AREA)4TH SAMPLELOCATION(PLACEMENTPROVIDESCHARACTERIZATIONOF REMAININGSLAB AREA)

Aptus Management, PLLC
ATTACHMENT 1
H&P SAMPLING GUIDE: COLLECTING SOIL VAPOR INTO SUMMA CANISTERS
d'T) Mobile
Geochemistry Inc.
2470 Impala Drive, Carlsbad, CA 92010
Field Office in Signal Hill, CA
Ph: 800-834-9888 www.handpmg.com
Rev3, August 2014
SAMPLING GUIDE A: Collecting Soil Vapor into Summa Canisters
Recommended Tools/Supplies
> Scissors/Snips to cut tubing
> Nitrile Gloves
> Ball Point Pen
> If using a Liquid Leak Check Compound:
> 1,1-Difluoroethane "duster spray" or Isopropyl Alcohol
> Cloth Towel(s)
> Resealable plastic bag
Sample Parts/Supplies Provided (Pic 1)
These Items are sent 1 per sample (not including duplicate or back up Summa):
> A-400 mL Summa Canister w/ male quick connect {may be substituted with 1 L Summa Canister)
> B - Sample Kit (vacuum gauge, female quick connect, 100-200 or 50 mL/min flow restrictor, 1/4" barb)
> C - Male Luer with 3/8" Tygon tubing connector
> D-3-way valve
These Items are sent 1 per project:
> E - Consumables Bag (which contains):
> D-3-way valves (2)
> F - 60 mL plastic syringes (2)
> G-1/4" Tygon tubing
> H- 3/8" Tygon tubing
> I-Cable Ties
Picture 1
Mobile
Geochemistry Inc.
2470 Impala Drive, Carlsbad, OA 92010
Field Office in Signal Hill, OA
Ph: 800-834-9888 www.handpmg.com
Rev3, August 2014
Connecting the Sample Train to the Soil Vapor Probe
1.
2.
3.
4.
5.
Attach a 3-way valve (D) onto the vapor probe 1-way valve by twisting male luer fitting
on 3-way valve into female luer fitting on valve. (See Pic 2) Note: If you ore not
connecting to H&P's standard soil vapor probe 1-way valve, you will need to make the
proper tubing connections to attach the 3-way valve onto the valve connection on the
probe. It is highly recommended that the soil vapor probe be equipped with a
termination valve in order to conduct a proper shut-in test which will be discussed later.
Attach a separate 3-way valve onto plastic purge syringe and then
twist male luer end of 3-way valve Into female luer end on the 3-
way valve attached to the vapor probe. (See Pic 3)
Attach a male luer fitting with 3/8" Tygon tubing connector (C) to
1/4" barb on inlet port of Sample Kit (B). (See Pic 4)
Twist male luer fitting on Sample Kit into side port of 3-way valve
attached to the sample probe valve. (See Pic 5)
Attach Summa Canister to Sample Kit by using the quick connect
fittings. Pull back collar on female quick connect attached to
Sample Kit, and insert male quick connect on Summa. (See Pic 6)
Pi
Picture 2
cture
Picture 4
-KCiW-Picture 5
Picture 6
d^T) Mobile
Geochemistry Inc.
Conducting a Shut-In Test
2470 Impala Drive. Carlsbad, CA 92010
Field Office in Signal Hill. CA
Ph: 800-834-9888 www.handpmg.com
Rev3, August 2014
1.
2.
3.
4.
5.
The 1-way valve on the soil vapor probe should be in the Off position. Turn the 3-way valve attached to
the 1-way valve so that It is Off in the direction pointing away from all ports on the valve. {See Pic 7)
With the 3-way valve attached to the purge syringe turned so that the side port is closed, pull back on the
plunger so that you draw a vacuum on all the fittings through to the Summa Canister. The vacuum gauge
should now be reading vacuum pressure.
Once the needle on the vacuum gauge reaches a vacuum of greater than 10" Hg, immediately turn the 3-
way valve on the syringe so that it is Off towards the probe valves. (See Pic 8)
Observe the vacuum gauge for at least 1 minute to determine if there is any vacuum loss.
If the needle drops, indicating a leak in the sample train, retlghten all fittings and conduct shut-in test
again.
Note: The vacuum gauge reads in inches of Mercury. 7.4" Hg is equal to 100" H20. You should maintain
a vacuum of at least 100" H20 (or 7 -8" Hg) when conducting the shut-in test.
Picture 7
Turn 3-way valve so
that it is Off in the
direction pointing
away from ail ports.
Turn valve on the
soil vapor probe to
the Off position.
Picture
Apply vacuum until vacuum
gauge reaches 10" Hg or more,
then turn 3-way valve on syringe
Off towards the vapor probe.
lliP Mobilen Geochemistry Inc.
Applying a Liquid Leak Check Compound
1. Be sure to have on Nitrile gloves.
2. Place towel in resealable plastic bag.
3. Carefully spray or pour liquid leak check compound
onto towel in bag. Do not oversaturate towel with
compound. Note: liquid leak compounds typically
used are 1,1-Difluoroethane (duster spray), or
Isopropyl Alcohol.
4. Seal up plastic bag.
5. Just prior to purging and sampling of the probe,
gently place one saturated towel at the base of the
soil vapor probe where the tubing enters the
subsurface. Lay another towel near all of the
sample train connections. Do not lay towel directly
on fittings. (See Pic 9)
6. Discard Nitrile gloves, as compounds can be quite
strong, and put on new pair prior to purging and
sampling to prevent any cross contamination.
2470lmpaia Drive, Carlsbad, CA 92010
Field Office in Signal Hill, CA
Ph: 800-834-9888 www.handpmg.com
Rev3, August 2014
Picture 9
Purging Soil Vapor Probes
1.
2,
3.
4.
5.
Determine the proper purge volume to be evacuated from the soil vapor probe (e.g. 3 dead volumes).
Turn the 3-way valve connected to the probe valve so that it is Off towards the Sample Kit and Summa
Canister. Note: There should still be a vacuum from the 3-way valve to the Summa Canister. This vacuum
pressure should remain until Summa is to be sampled.
Open the valve on the probe. (See Pic 10)
Using the syringe to purge, slowly draw out the vapor by pulling back on the plunger to fill syringe. Then
expel the purge air by turning the 3-way valve so it is Off towards the probe, and pushing the plunger In.
Repeat this process until the desired purge volume is evacuated from the probe. Note: For larger purge
volumes, inquire about H&P's Balkenbox purge pump.
To maintain a flow rate of less than 200 ml/min, it should take approximately 20 seconds to pull back the
plunger a full 60 mL.
Picture 10
Valve Off toward
Sample Kit and SummaOpen vapor
probe valve
Vapor Flow
11.?Mobile
Geochemistry Inc.
Collecting the Summa Canister Sample
2470 Impala Drive, Carlsbad, CA 92010
Field Office in Signal Hill, CA
Ph; 800-834-9888 www.handpmg.com
Rev3, August 2014
1. After purging has been completed, turn the 3-way valve attached to the On/Off probe valve so that it is
Off towards the purge syringe. (See Pic 11)
2. The needle on the Sample Kit vacuum gauge should drop Indicating that the Sample Kit is filling with
sample air from the probe.
3. Open the valve on the Summa Canister.
4. The needle on the Sample Kit will rise back up and show the initial vacuum of the Summa Canister.
5. Record starting time and the starting vacuum of Summa Canister.
6. The needle will slowly drop as the Summa Canister fills with the sample vapor. This should take 3-4
minutes to fill a 400 ml size Summa Canister at a flow rate of 100-200 mL/min. If using a slower flow
rate, such as 50 mL/min, it should take 8-10 minutes to fill.
7. Allow the canister to completely fill and the needle to reach 0"Hg.
8. Close valve on Summa Canister and disconnect. Record sample end time and ending vacuum of the
Summa Canister.
9. Label the Summa with the appropriate sample information.
10. Record sample on the Chain of Custody.
Picture 11
Valve Off toward
purge syringe
Disconnecting Sample Train
1. Disconnect all fittings.
2. Because all sampling is done prior to the purge syringe and the attached 3-way valve, they may be reused
for other samples.
3. All other fittings, adaptors, and valves should not be reused in the collection of other samples.
Mobile
Geochennistry Inc.
2470 Impala Drive, Carlsbad, OA 92010
Field Office in Signal Hill, CA
Ph: 800-834-9888 www.handpmg.com
RevS, August 2014
Collection Notes
> If water is observed in the sample tubing, stop coilection Immediately. If you suspect that water may have
entered the Summa Canister, make a note on the sample label and Chain of Custody.
> Twist luer fittings into each other so that all valves and gauges are facing up. This may take some practice.
> At the standard flow rate of 100 - 200 mL/mIn, each 400 mL Summa Canister should fill in 3 to 5 minutes
depending upon soil permeability. If the Summa is not filled within 5 minutes, make note of the vacuum
reading. Allow the Summa to fill for another 5 minutes. If it is not filled after 10 minutes, make a note of the
vacuum reading and stop collection.
> If using all Summa Canister, the canister should fill In 5 to 8 minutes at a flow rate of 100 - 200 mL/min.
> Label samples with a ballpoint pen. DO NOT USE SHARPIE!
> After sampling, return Summa Canister and Sample Kit back into same box they were shipped in. Please do
not write on shipping boxes.
> You do not need to return any of the consumable items (i.e. syringes, valves, tubing).
> Keep Summa Canisters out of sun and do not chill. Keep at room temperature.
> Wash hands or remove gloves between samples to ensure the leak/tracer compound is not on your fingers
when connecting fittings.

Aptus Management, PLLC
ATTACHMENT 2 H&P SOIL VAPOR SAMPLING USING SHROUD METHOD OF LEAK DETECTION
H&P Mobile Geochemistry, Inc.
2470 Impala Drive, Carlsbad, CA 92010
Ph. 760-804-9678 www.handpmg.com
Soil Vapor Sampling using Shroud Method of Leak Detection
Placing a plastic shroud over a soil vapor sampling probe and introducing a gaseous
compound, such as helium, into the shroud can be implemented to ensure the probe
seal integrity. It may also be used to assess the potential for leaks in the sample train.
A plastic shroud is placed over the soil vapor probe location with the tubing of the probe
exiting the shroud through a small hole. The valve on the probe termination is
connected to the sampling apparatus that is to be used. Smaller purge volumes may
only require a syringe to purge, while larger purge volumes may require a sample pump
with flow meter and vacuum gauge.
A “shut in” test is performed to check for leaks in all sample fittings and connections not
contained within shroud. This is achieved by shutting the valve at the probe termination
to the off position, then applying a vacuum to all connections between the valve and the
sample container (i.e. syringe or summa canister). An in-line vacuum gauge is used to
observe any loss in vacuum over a period of time (i.e. 60 seconds), which would indicate
a leak in the system.
Helium (or other compound) is released into the shroud and a hand held helium detector
is used to monitor and maintain a reasonably steady concentration of approximately
50% helium in the shroud. Once the concentration is reached, the soil vapor probe is
purged at the recommended flow rate and any probe vacuum is recorded. A Tedlar bag
is then collected from the probe by connecting to the exhaust port of the purge syringe to
fill, or by using a Tedlar lung box. The contents of the Tedlar bag are then screened with
the Helium detector. If the concentration in the bag is ≤10% of the Helium concentration
in the shroud, sampling is continued. If Helium concentration in the Tedlar bag is >10%
of the shroud concentration, the sampling is stopped and efforts to improve or replace
the probe are made.
The soil vapor sample is then collected in the appropriate sample container (i.e. syringe
or summa canister). Once the sample is taken, a final reading of the shroud
concentration is measured with the meter and recorded.

APPENDIX B

PHOTOGRAPHS

Creating boring at SS-3 location Slab thickness at SS-3 location (7.5”)
Creating boring at SS-1 location Creating boring at SS-4 location
Creating boring at SS-2 location Boring depth at SS-4 location (10.25”)
Slab thickness at SS-4 location (8”) Vapor Pin placement at SS-4 location

Slab thickness at SS-2 location (7”) Boring depth at SS-2 location (11.5”)
Canister sampling - SS-3 location Shut-in test - SS-3 location
Helium shroud leak check at SS-3 location Shroud helium level during leak check - SS-3 location
Purge volume helium level – SS-3 location Post-sampling shroud helium concentration - SS-3
location

Post-sampling purge volume helium level - SS-3
location
Purge volume helium level – SS-3 location
Duplicate canister sampling - SS-1 location Shut-in test - SS-1 location
Shroud helium level during leak check - SS-1 location Post-sampling purge volume helium level - SS-1
location
Sample collection - SS-1 location Shut-in test - SS-2 location

Shroud helium level during leak check - SS-2 location Purge volume helium level – SS-2 location
Canister sampling - SS-2 location Shut-in test - SS-4 location
Shroud helium level during leak check - SS-4 location Purge volume helium level – SS-4 location
Post-sampling purge volume helium level - SS-4
location
Post-sampling purge volume helium level - SS-4
location

APPENDIX C

NCDWM RESIDENTIAL VAPOR INTRUSION
SCREENING LEVELS TABLE (OCTOBER 2017)

CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
30560-19-1 Acephate75-07-0 Acetaldehyde 6.9E+02 6.3E+01 N 1.3E+00 C 1.9E+00 N 1.9E+00 N Yes
34256-82-1 Acetochlor
67-64-1 Acetone 4.5E+06 2.2E+05 N 6.5E+03 N 6.5E+03 N 6.5E+03 N Yes
75-86-5 Acetone Cyanohydrin Not Volatile Not Volatile 4.2E-01 N 4.2E-01 N 4.2E-01 N Yes
75-05-8 Acetonitrile 8.9E+03 4.2E+02 N 1.3E+01 N 1.3E+01 N 1.3E+01 N Yes
98-86-2 Acetophenone
53-96-3 Acetylaminofluorene, 2- Not Volatile Not Volatile 2.2E-03 C 2.2E-02 C 2.2E-01 C107-02-8 Acrolein 8.4E-01 1.4E-01 N 4.2E-03 N 4.2E-03 N 4.2E-03 N Yes79-06-1 Acrylamide Not Volatile Not Volatile 1.0E-02 C 1.0E-01 C 1.0E+00 C Yes
79-10-7 Acrylic Acid 1.4E+04 7.0E+00 N 2.1E-01 N 2.1E-01 N 2.1E-01 N Yes
107-13-1 Acrylonitrile 7.3E+01 1.4E+01 C 4.1E-02 C 4.1E-01 C 4.2E-01 N Yes
111-69-3 Adiponitrile Not Volatile Not Volatile 1.3E+00 N 1.3E+00 N 1.3E+00 N Yes
15972-60-8 Alachlor
116-06-3 Aldicarb
1646-88-4 Aldicarb Sulfone1646-87-3 Aldicarb sulfoxide309-00-2 Aldrin 3.2E+00 1.9E-01 C 5.7E-04 C 5.7E-03 C 5.7E-02 C
107-18-6 Allyl Alcohol 1.0E+02 7.0E-01 N 2.1E-02 N 2.1E-02 N 2.1E-02 N Yes
107-05-1 Allyl Chloride 4.6E-01 7.0E+00 N 2.1E-01 N 2.1E-01 N 2.1E-01 N Yes
7429-90-5 Aluminum Not Volatile Not Volatile 1.0E+00 N 1.0E+00 N 1.0E+00 N Yes
20859-73-8 Aluminum Phosphide
834-12-8 Ametryn
92-67-1 Aminobiphenyl, 4- Not Volatile Not Volatile 4.7E-04 C 4.7E-03 C 4.7E-02 C
591-27-5 Aminophenol, m-95-55-6 Aminophenol, o-123-30-8 Aminophenol, p-
33089-61-1 Amitraz
7664-41-7 Ammonia 1.6E+05 3.5E+03 N 1.0E+02 N 1.0E+02 N 1.0E+02 N Yes
7773-06-0 Ammonium Sulfamate
75-85-4 Amyl Alcohol, tert- 1.1E+03 2.1E+01 N 6.3E-01 N 6.3E-01 N 6.3E-01 N Yes
62-53-3 Aniline Not Volatile Not Volatile 2.1E-01 N 2.1E-01 N 2.1E-01 N Yes
84-65-1 Anthraquinone, 9,10-7440-36-0 Antimony (metallic)1314-60-9 Antimony Pentoxide
1332-81-6 Antimony Tetroxide
1309-64-4 Antimony Trioxide Not Volatile Not Volatile 4.2E-02 N 4.2E-02 N 4.2E-02 N Yes
7440-38-2 Arsenic, Inorganic Not Volatile Not Volatile 6.5E-04 C 3.1E-03 N 3.1E-03 N Yes
7784-42-1 Arsine Not Volatile Not Volatile 1.0E-02 N 1.0E-02 N 1.0E-02 N Yes
3337-71-1 Asulam
1912-24-9 Atrazine492-80-8 Auramine Not Volatile Not Volatile 1.1E-02 C 1.1E-01 C 1.1E+00 C65195-55-3 Avermectin B1
86-50-0 Azinphos-methyl Not Volatile Not Volatile 2.1E+00 N 2.1E+00 N 2.1E+00 N Yes
103-33-3 Azobenzene 1.6E+03 3.0E+01 C 9.1E-02 C 9.1E-01 C 9.1E+00 C
123-77-3 Azodicarbonamide Not Volatile Not Volatile 1.5E-03 N 1.5E-03 N 1.5E-03 N Yes
7440-39-3 Barium Not Volatile Not Volatile 1.0E-01 N 1.0E-01 N 1.0E-01 N Yes
10294-40-3 Barium Chromate Not Volatile Not Volatile 6.8E-06 C 6.8E-05 C 6.8E-04 C Yes
1861-40-1 Benfluralin
17804-35-2 Benomyl83055-99-6 Bensulfuron-methyl25057-89-0 Bentazon
100-52-7 Benzaldehyde
71-43-2 Benzene 1.6E+01 1.2E+02 C 3.6E-01 C 3.6E+00 C 6.3E+00 N Yes
6369-59-1 Benzenediamine-2-methyl sulfate, 1,4-
108-98-5 Benzenethiol
92-87-5 Benzidine Not Volatile Not Volatile 1.5E-05 C 1.5E-04 C 1.5E-03 C
65-85-0 Benzoic Acid98-07-7 Benzotrichloride100-51-6 Benzyl Alcohol
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
Page 1 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
100-44-7 Benzyl Chloride 1.2E+01 7.0E+00 N 5.7E-02 C 2.1E-01 N 2.1E-01 N Yes7440-41-7 Beryllium and compounds Not Volatile Not Volatile 1.2E-03 C 4.2E-03 N 4.2E-03 N Yes
42576-02-3 Bifenox
82657-04-3 Biphenthrin
92-52-4 Biphenyl, 1,1'- 6.6E+00 2.8E+00 N 8.3E-02 N 8.3E-02 N 8.3E-02 N Yes
108-60-1 Bis(2-chloro-1-methylethyl) ether
111-91-1 Bis(2-chloroethoxy)methane
111-44-4 Bis(2-chloroethyl)ether 1.2E+02 2.8E+00 C 8.5E-03 C 8.5E-02 C 8.5E-01 C542-88-1 Bis(chloromethyl)ether 2.5E-03 1.5E-02 C 4.5E-05 C 4.5E-04 C 4.5E-03 C80-05-7 Bisphenol A
7440-42-8 Boron And Borates Only Not Volatile Not Volatile 4.2E+00 N 4.2E+00 N 4.2E+00 N Yes
10294-34-5 Boron Trichloride 5.6E+00 1.4E+02 N 4.2E+00 N 4.2E+00 N 4.2E+00 N Yes
7637-07-2 Boron Trifluoride 9.0E+01 N 2.7E+00 N 2.7E+00 N 2.7E+00 N Yes
15541-45-4 Bromate
107-04-0 Bromo-2-chloroethane, 1- 1.3E+00 1.6E+00 C 4.7E-03 C 4.7E-02 C 4.7E-01 C
108-86-1 Bromobenzene 1.2E+02 4.2E+02 N 1.3E+01 N 1.3E+01 N 1.3E+01 N Yes74-97-5 Bromochloromethane 1.4E+02 2.8E+02 N 8.3E+00 N 8.3E+00 N 8.3E+00 N Yes75-27-4 Bromodichloromethane 8.8E+00 2.5E+01 C 7.6E-02 C 7.6E-01 C 7.6E+00 C
75-25-2 Bromoform 1.2E+03 8.5E+02 C 2.6E+00 C 2.6E+01 C 2.6E+02 C
74-83-9 Bromomethane 3.5E+00 3.5E+01 N 1.0E+00 N 1.0E+00 N 1.0E+00 N Yes
2104-96-3 Bromophos
1689-84-5 Bromoxynil
1689-99-2 Bromoxynil Octanoate
106-99-0 Butadiene, 1,3- 1.4E-01 1.4E+01 N 9.4E-02 C 4.2E-01 N 4.2E-01 N Yes
94-82-6 Butanoic acid, 4-(2,4-dichlorophenoxy)-71-36-3 Butanol, N-78-92-2 Butyl alcohol, sec- 1.7E+07 2.1E+05 N 6.3E+03 N 6.3E+03 N 6.3E+03 N Yes
2008-41-5 Butylate
25013-16-5 Butylated hydroxyanisole Not Volatile Not Volatile 4.9E+01 C 4.9E+02 C 4.9E+03 C
128-37-0 Butylated hydroxytoluene
104-51-8 Butylbenzene, n-
135-98-8 Butylbenzene, sec-
98-06-6 Butylbenzene, tert-75-60-5 Cacodylic Acid7440-43-9 Cadmium (Diet) Not Volatile Not Volatile 1.6E-03 C 2.1E-03 N 2.1E-03 N Yes
7440-43-9 Cadmium (Water) Not Volatile Not Volatile 1.6E-03 C 2.1E-03 N 2.1E-03 N Yes
13765-19-0 Calcium Chromate Not Volatile Not Volatile 6.8E-06 C 6.8E-05 C 6.8E-04 C Yes
105-60-2 Caprolactam Not Volatile Not Volatile 4.6E-01 N 4.6E-01 N 4.6E-01 N Yes
2425-06-1 Captafol Not Volatile Not Volatile 6.5E-02 C 6.5E-01 C 6.5E+00 C
133-06-2 Captan Not Volatile Not Volatile 4.3E+00 C 4.3E+01 C 4.3E+02 C
63-25-2 Carbaryl1563-66-2 Carbofuran75-15-0 Carbon Disulfide 2.5E+02 4.9E+03 N 1.5E+02 N 1.5E+02 N 1.5E+02 N Yes
56-23-5 Carbon Tetrachloride 4.1E+00 1.6E+02 C 4.7E-01 C 4.7E+00 C 2.1E+01 N Yes
463-58-1 Carbonyl Sulfide 8.4E-01 7.0E+02 N 2.1E+01 N 2.1E+01 N 2.1E+01 N Yes
55285-14-8 Carbosulfan
5234-68-4 Carboxin
1306-38-3 Ceric oxide Not Volatile Not Volatile 1.9E-01 N 1.9E-01 N 1.9E-01 N Yes
302-17-0 Chloral Hydrate
133-90-4 Chloramben118-75-2 Chloranil12789-03-6 Chlordane 7.3E+01 4.9E+00 N 2.8E-02 C 1.5E-01 N 1.5E-01 N Yes
143-50-0 Chlordecone (Kepone) Not Volatile Not Volatile 6.1E-04 C 6.1E-03 C 6.1E-02 C
470-90-6 Chlorfenvinphos
90982-32-4 Chlorimuron, Ethyl-
7782-50-5 Chlorine 6.5E-02 1.0E+00 N 3.1E-02 N 3.1E-02 N 3.1E-02 N Yes
10049-04-4 Chlorine Dioxide 2.5E-02 1.4E+00 N 4.2E-02 N 4.2E-02 N 4.2E-02 N Yes
7758-19-2 Chlorite (Sodium Salt)75-68-3 Chloro-1,1-difluoroethane, 1- 4.3E+03 3.5E+05 N 1.0E+04 N 1.0E+04 N 1.0E+04 N Yes126-99-8 Chloro-1,3-butadiene, 2- 4.1E-02 3.1E+00 C 9.4E-03 C 9.4E-02 C 9.4E-01 C Yes
Page 2 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
3165-93-3 Chloro-2-methylaniline HCl, 4-95-69-2 Chloro-2-methylaniline, 4- Not Volatile Not Volatile 3.6E-02 C 3.6E-01 C 3.6E+00 C
107-20-0 Chloroacetaldehyde, 2-
79-11-8 Chloroacetic Acid
532-27-4 Chloroacetophenone, 2- Not Volatile Not Volatile 6.3E-03 N 6.3E-03 N 6.3E-03 N Yes
106-47-8 Chloroaniline, p-
108-90-7 Chlorobenzene 8.2E+01 3.5E+02 N 1.0E+01 N 1.0E+01 N 1.0E+01 N Yes
98-66-8 Chlorobenzene sulfonic acid, p-510-15-6 Chlorobenzilate Not Volatile Not Volatile 9.1E-02 C 9.1E-01 C 9.1E+00 C74-11-3 Chlorobenzoic Acid, p-
98-56-6 Chlorobenzotrifluoride, 4- 4.4E+01 2.1E+03 N 6.3E+01 N 6.3E+01 N 6.3E+01 N Yes
109-69-3 Chlorobutane, 1-
75-45-6 Chlorodifluoromethane 6.3E+03 3.5E+05 N 1.0E+04 N 1.0E+04 N 1.0E+04 N Yes
107-07-3 Chloroethanol, 2-
67-66-3 Chloroform 8.1E+00 4.1E+01 C 1.2E-01 C 1.2E+00 C 1.2E+01 C Yes
74-87-3 Chloromethane 5.2E+01 6.3E+02 N 1.9E+01 N 1.9E+01 N 1.9E+01 N Yes107-30-2 Chloromethyl Methyl Ether 3.3E+00 1.4E+00 C 4.1E-03 C 4.1E-02 C 4.1E-01 C88-73-3 Chloronitrobenzene, o- Not Volatile Not Volatile 2.1E-03 N 2.1E-03 N 2.1E-03 N Yes
100-00-5 Chloronitrobenzene, p- Not Volatile Not Volatile 4.2E-01 N 4.2E-01 N 4.2E-01 N Yes
95-57-8 Chlorophenol, 2-
76-06-2 Chloropicrin 1.0E+00 2.8E+00 N 8.3E-02 N 8.3E-02 N 8.3E-02 N Yes
1897-45-6 Chlorothalonil Not Volatile Not Volatile 3.2E+00 C 3.2E+01 C 3.2E+02 C
95-49-8 Chlorotoluene, o-
106-43-4 Chlorotoluene, p-
54749-90-5 Chlorozotocin Not Volatile Not Volatile 4.1E-05 C 4.1E-04 C 4.1E-03 C101-21-3 Chlorpropham2921-88-2 Chlorpyrifos
5598-13-0 Chlorpyrifos Methyl
64902-72-3 Chlorsulfuron
1861-32-1 Chlorthal-dimethyl
60238-56-4 Chlorthiophos
16065-83-1 Chromium(III), Insoluble Salts
18540-29-9 Chromium(VI) Not Volatile Not Volatile 1.2E-05 C 1.2E-04 C 1.2E-03 C Yes7440-47-3 Chromium, Total74115-24-5 Clofentezine
7440-48-4 Cobalt Not Volatile Not Volatile 3.1E-04 C 1.3E-03 N 1.3E-03 N Yes
8007-45-2 Coke Oven Emissions 3.6E-02 5.5E-01 C 1.6E-03 C 1.6E-02 C 1.6E-01 C
7440-50-8 Copper
108-39-4 Cresol, m- Not Volatile Not Volatile 1.3E+02 N 1.3E+02 N 1.3E+02 N Yes
95-48-7 Cresol, o- Not Volatile Not Volatile 1.3E+02 N 1.3E+02 N 1.3E+02 N Yes
106-44-5 Cresol, p- Not Volatile Not Volatile 1.3E+02 N 1.3E+02 N 1.3E+02 N Yes59-50-7 Cresol, p-chloro-m-1319-77-3 Cresols Not Volatile Not Volatile 1.3E+02 N 1.3E+02 N 1.3E+02 N Yes
123-73-9 Crotonaldehyde, trans-
98-82-8 Cumene 1.8E+02 2.8E+03 N 8.3E+01 N 8.3E+01 N 8.3E+01 N Yes
135-20-6 Cupferron Not Volatile Not Volatile 4.5E-02 C 4.5E-01 C 4.5E+00 C
21725-46-2 Cyanazine
Cyanides
592-01-8 ~Calcium Cyanide
544-92-3 ~Copper Cyanide57-12-5 ~Cyanide (CN-) 4.0E+01 5.6E+00 N 1.7E-01 N 1.7E-01 N 1.7E-01 N Yes460-19-5 ~Cyanogen
506-68-3 ~Cyanogen Bromide
506-77-4 ~Cyanogen Chloride
74-90-8 ~Hydrogen Cyanide 3.1E+01 5.6E+00 N 1.7E-01 N 1.7E-01 N 1.7E-01 N Yes
151-50-8 ~Potassium Cyanide
506-61-6 ~Potassium Silver Cyanide
506-64-9 ~Silver Cyanide143-33-9 ~Sodium CyanideE1790664 ~Thiocyanates
Page 3 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
463-56-9 ~Thiocyanic Acid557-21-1 ~Zinc Cyanide
110-82-7 Cyclohexane 2.0E+02 4.2E+04 N 1.3E+03 N 1.3E+03 N 1.3E+03 N Yes
87-84-3 Cyclohexane, 1,2,3,4,5-pentabromo-6-
chloro-
108-94-1 Cyclohexanone 4.0E+05 4.9E+03 N 1.5E+02 N 1.5E+02 N 1.5E+02 N Yes
110-83-8 Cyclohexene 1.1E+02 7.0E+03 N 2.1E+02 N 2.1E+02 N 2.1E+02 N Yes108-91-8 Cyclohexylamine68359-37-5 Cyfluthrin
68085-85-8 Cyhalothrin
52315-07-8 Cypermethrin
66215-27-8 Cyromazine
72-54-8 DDD Not Volatile Not Volatile 4.1E-02 C 4.1E-01 C 4.1E+00 C
72-55-9 DDE, p,p'- 1.7E+02 9.6E+00 C 2.9E-02 C 2.9E-01 C 2.9E+00 C
50-29-3 DDT Not Volatile Not Volatile 2.9E-02 C 2.9E-01 C 2.9E+00 C75-99-0 Dalapon1596-84-5 Daminozide Not Volatile Not Volatile 5.5E-01 C 5.5E+00 C 5.5E+01 C
1163-19-5 Decabromodiphenyl ether,
2,2',3,3',4,4',5,5',6,6'- (BDE-209)
8065-48-3 Demeton
103-23-1 Di(2-ethylhexyl)adipate
2303-16-4 Diallate
333-41-5 Diazinon132-65-0 Dibenzothiophene96-12-8 Dibromo-3-chloropropane, 1,2- 2.8E-01 5.6E-02 C 1.7E-04 C 1.7E-03 C 1.7E-02 C Yes
108-36-1 Dibromobenzene, 1,3-
106-37-6 Dibromobenzene, 1,4-
124-48-1 Dibromochloromethane
106-93-4 Dibromoethane, 1,2- 1.8E+00 1.6E+00 C 4.7E-03 C 4.7E-02 C 4.7E-01 C Yes
74-95-3 Dibromomethane (Methylene Bromide) 2.5E+01 2.8E+01 N 8.3E-01 N 8.3E-01 N 8.3E-01 N Yes
E1790660 Dibutyltin Compounds1918-00-9 Dicamba764-41-0 Dichloro-2-butene, 1,4- 1.9E-02 2.2E-01 C 6.7E-04 C 6.7E-03 C 6.7E-02 C
1476-11-5 Dichloro-2-butene, cis-1,4- 2.5E-01 2.2E-01 C 6.7E-04 C 6.7E-03 C 6.7E-02 C
110-57-6 Dichloro-2-butene, trans-1,4- 2.5E-01 2.2E-01 C 6.7E-04 C 6.7E-03 C 6.7E-02 C
79-43-6 Dichloroacetic Acid
95-50-1 Dichlorobenzene, 1,2- 5.3E+02 1.4E+03 N 4.2E+01 N 4.2E+01 N 4.2E+01 N Yes
106-46-7 Dichlorobenzene, 1,4- 2.6E+01 8.5E+01 C 2.6E-01 C 2.6E+00 C 2.6E+01 C Yes
91-94-1 Dichlorobenzidine, 3,3'- Not Volatile Not Volatile 8.3E-03 C 8.3E-02 C 8.3E-01 C90-98-2 Dichlorobenzophenone, 4,4'-75-71-8 Dichlorodifluoromethane 1.5E+00 7.0E+02 N 2.1E+01 N 2.1E+01 N 2.1E+01 N Yes
75-34-3 Dichloroethane, 1,1- 7.6E+01 5.8E+02 C 1.8E+00 C 1.8E+01 C 1.8E+02 C
107-06-2 Dichloroethane, 1,2- 2.2E+01 3.6E+01 C 1.1E-01 C 1.1E+00 C 1.5E+00 N Yes
75-35-4 Dichloroethylene, 1,1- 3.9E+01 1.4E+03 N 4.2E+01 N 4.2E+01 N 4.2E+01 N Yes
156-59-2 Dichloroethylene, 1,2-cis-
156-60-5 Dichloroethylene, 1,2-trans-
120-83-2 Dichlorophenol, 2,4-
94-75-7 Dichlorophenoxy Acetic Acid, 2,4-78-87-5 Dichloropropane, 1,2- 6.6E+00 2.5E+01 C 7.6E-02 C 7.6E-01 C 8.3E-01 N Yes142-28-9 Dichloropropane, 1,3-
616-23-9 Dichloropropanol, 2,3-
542-75-6 Dichloropropene, 1,3- 2.9E+01 1.4E+02 N 7.0E-01 C 4.2E+00 N 4.2E+00 N Yes
62-73-7 Dichlorvos Not Volatile Not Volatile 3.4E-02 C 1.0E-01 N 1.0E-01 N Yes
141-66-2 Dicrotophos
77-73-6 Dicyclopentadiene 2.4E-02 2.1E+00 N 6.3E-02 N 6.3E-02 N 6.3E-02 N Yes
60-57-1 Dieldrin Not Volatile Not Volatile 6.1E-04 C 6.1E-03 C 6.1E-02 CE17136615 Diesel Engine Exhaust Not Volatile Not Volatile 9.4E-03 C 9.4E-02 C 9.4E-01 C Yes111-42-2 Diethanolamine Not Volatile Not Volatile 4.2E-02 N 4.2E-02 N 4.2E-02 N Yes
112-34-5 Diethylene Glycol Monobutyl Ether Not Volatile Not Volatile 2.1E-02 N 2.1E-02 N 2.1E-02 N Yes
111-90-0 Diethylene Glycol Monoethyl Ether Not Volatile Not Volatile 6.3E-02 N 6.3E-02 N 6.3E-02 N Yes
Page 4 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
617-84-5 Diethylformamide56-53-1 Diethylstilbestrol Not Volatile Not Volatile 2.8E-05 C 2.8E-04 C 2.8E-03 C
43222-48-6 Difenzoquat
35367-38-5 Diflubenzuron
75-37-6 Difluoroethane, 1,1- 1.0E+04 2.8E+05 N 8.3E+03 N 8.3E+03 N 8.3E+03 N Yes
94-58-6 Dihydrosafrole 4.3E+03 7.2E+01 C 2.2E-01 C 2.2E+00 C 2.2E+01 C
108-20-3 Diisopropyl Ether 1.4E+03 4.9E+03 N 1.5E+02 N 1.5E+02 N 1.5E+02 N Yes
1445-75-6 Diisopropyl Methylphosphonate55290-64-7 Dimethipin60-51-5 Dimethoate
119-90-4 Dimethoxybenzidine, 3,3'-
756-79-6 Dimethyl methylphosphonate
60-11-7 Dimethylamino azobenzene [p-] Not Volatile Not Volatile 2.2E-03 C 2.2E-02 C 2.2E-01 C
21436-96-4 Dimethylaniline HCl, 2,4-
95-68-1 Dimethylaniline, 2,4-
121-69-7 Dimethylaniline, N,N-119-93-7 Dimethylbenzidine, 3,3'-68-12-2 Dimethylformamide 2.1E+06 2.1E+02 N 6.3E+00 N 6.3E+00 N 6.3E+00 N Yes
57-14-7 Dimethylhydrazine, 1,1- 7.9E-01 1.4E-02 N 4.2E-04 N 4.2E-04 N 4.2E-04 N Yes
540-73-8 Dimethylhydrazine, 1,2- 6.2E+01 5.8E-03 C 1.8E-05 C 1.8E-04 C 1.8E-03 C
105-67-9 Dimethylphenol, 2,4-
576-26-1 Dimethylphenol, 2,6-
95-65-8 Dimethylphenol, 3,4-
513-37-1 Dimethylvinylchloride 4.5E+01 7.2E+01 C 2.2E-01 C 2.2E+00 C 2.2E+01 C
534-52-1 Dinitro-o-cresol, 4,6-131-89-5 Dinitro-o-cyclohexyl Phenol, 4,6-528-29-0 Dinitrobenzene, 1,2-
99-65-0 Dinitrobenzene, 1,3-
100-25-4 Dinitrobenzene, 1,4-
51-28-5 Dinitrophenol, 2,4-
E1615210 Dinitrotoluene Mixture, 2,4/2,6-
121-14-2 Dinitrotoluene, 2,4- Not Volatile Not Volatile 3.2E-02 C 3.2E-01 C 3.2E+00 C
606-20-2 Dinitrotoluene, 2,6-35572-78-2 Dinitrotoluene, 2-Amino-4,6-19406-51-0 Dinitrotoluene, 4-Amino-2,6-
25321-14-6 Dinitrotoluene, Technical grade
88-85-7 Dinoseb
123-91-1 Dioxane, 1,4- 2.9E+04 1.9E+02 C 5.6E-01 C 5.6E+00 C 6.3E+00 N Yes
Dioxins
NA ~Hexachlorodibenzo-p-dioxin, Mixture Not Volatile Not Volatile 2.2E-06 C 2.2E-05 C 2.2E-04 C
1746-01-6 ~TCDD, 2,3,7,8- 3.6E-04 2.5E-05 C 7.4E-08 C 7.4E-07 C 7.4E-06 C Yes957-51-7 Diphenamid127-63-9 Diphenyl Sulfone
122-39-4 Diphenylamine
122-66-7 Diphenylhydrazine, 1,2- Not Volatile Not Volatile 1.3E-02 C 1.3E-01 C 1.3E+00 C
85-00-7 Diquat
1937-37-7 Direct Black 38 Not Volatile Not Volatile 2.0E-05 C 2.0E-04 C 2.0E-03 C
2602-46-2 Direct Blue 6 Not Volatile Not Volatile 2.0E-05 C 2.0E-04 C 2.0E-03 C
16071-86-6 Direct Brown 95 Not Volatile Not Volatile 2.0E-05 C 2.0E-04 C 2.0E-03 C
298-04-4 Disulfoton505-29-3 Dithiane, 1,4-330-54-1 Diuron
2439-10-3 Dodine
759-94-4 EPTC
115-29-7 Endosulfan
145-73-3 Endothall
72-20-8 Endrin
106-89-8 Epichlorohydrin 1.7E+02 7.0E+00 N 2.1E-01 N 2.1E-01 N 2.1E-01 N Yes106-88-7 Epoxybutane, 1,2- 5.7E+02 1.4E+02 N 4.2E+00 N 4.2E+00 N 4.2E+00 N Yes111-77-3 Ethanol, 2-(2-methoxyethoxy)-
Page 5 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
16672-87-0 Ethephon563-12-2 Ethion
111-15-9 Ethoxyethanol Acetate, 2- 9.6E+04 4.2E+02 N 1.3E+01 N 1.3E+01 N 1.3E+01 N Yes
110-80-5 Ethoxyethanol, 2- 2.2E+06 1.4E+03 N 4.2E+01 N 4.2E+01 N 4.2E+01 N Yes
141-78-6 Ethyl Acetate 2.7E+03 4.9E+02 N 1.5E+01 N 1.5E+01 N 1.5E+01 N Yes
140-88-5 Ethyl Acrylate 1.2E+02 5.6E+01 N 1.7E+00 N 1.7E+00 N 1.7E+00 N Yes
75-00-3 Ethyl Chloride (Chloroethane) 4.6E+03 7.0E+04 N 2.1E+03 N 2.1E+03 N 2.1E+03 N Yes
60-29-7 Ethyl Ether97-63-2 Ethyl Methacrylate 2.7E+03 2.1E+03 N 6.3E+01 N 6.3E+01 N 6.3E+01 N Yes2104-64-5 Ethyl-p-nitrophenyl Phosphonate
100-41-4 Ethylbenzene 3.5E+01 3.7E+02 C 1.1E+00 C 1.1E+01 C 1.1E+02 C Yes
109-78-4 Ethylene Cyanohydrin
107-15-3 Ethylene Diamine
107-21-1 Ethylene Glycol Not Volatile Not Volatile 8.3E+01 N 8.3E+01 N 8.3E+01 N Yes
111-76-2 Ethylene Glycol Monobutyl Ether Not Volatile Not Volatile 3.3E+02 N 3.3E+02 N 3.3E+02 N Yes
75-21-8 Ethylene Oxide 5.6E-01 1.1E-01 C 3.4E-04 C 3.4E-03 C 3.4E-02 C Yes96-45-7 Ethylene Thiourea Not Volatile Not Volatile 2.2E-01 C 2.2E+00 C 2.2E+01 C151-56-4 Ethyleneimine 3.0E+00 4.9E-02 C 1.5E-04 C 1.5E-03 C 1.5E-02 C
84-72-0 Ethylphthalyl Ethyl Glycolate
22224-92-6 Fenamiphos
39515-41-8 Fenpropathrin
51630-58-1 Fenvalerate
2164-17-2 Fluometuron
16984-48-8 Fluoride Not Volatile Not Volatile 2.7E+00 N 2.7E+00 N 2.7E+00 N Yes
7782-41-4 Fluorine (Soluble Fluoride) Not Volatile Not Volatile 2.7E+00 N 2.7E+00 N 2.7E+00 N Yes59756-60-4 Fluridone56425-91-3 Flurprimidol
85509-19-9 Flusilazole
66332-96-5 Flutolanil
69409-94-5 Fluvalinate
133-07-3 Folpet
72178-02-0 Fomesafen
944-22-9 Fonofos50-00-0 Formaldehyde 1.5E+05 6.8E+01 N 2.2E-01 C 2.0E+00 N 2.0E+00 N Yes64-18-6 Formic Acid 9.2E+03 2.1E+00 N 6.3E-02 N 6.3E-02 N 6.3E-02 N Yes
39148-24-8 Fosetyl-AL
Furans
132-64-9 ~Dibenzofuran
110-00-9 ~Furan
109-99-9 ~Tetrahydrofuran 1.4E+05 1.4E+04 N 4.2E+02 N 4.2E+02 N 4.2E+02 N Yes
67-45-8 Furazolidone98-01-1 Furfural 6.8E+04 3.5E+02 N 1.0E+01 N 1.0E+01 N 1.0E+01 N Yes531-82-8 Furium Not Volatile Not Volatile 6.5E-03 C 6.5E-02 C 6.5E-01 C
60568-05-0 Furmecyclox Not Volatile Not Volatile 3.3E-01 C 3.3E+00 C 3.3E+01 C
77182-82-2 Glufosinate, Ammonium
111-30-8 Glutaraldehyde Not Volatile Not Volatile 1.7E-02 N 1.7E-02 N 1.7E-02 N Yes
765-34-4 Glycidyl 1.0E+04 7.0E+00 N 2.1E-01 N 2.1E-01 N 2.1E-01 N Yes
1071-83-6 Glyphosate
113-00-8 Guanidine
50-01-1 Guanidine Chloride506-93-4 Guanidine Nitrate69806-40-2 Haloxyfop, Methyl
76-44-8 Heptachlor 1.8E+00 7.2E-01 C 2.2E-03 C 2.2E-02 C 2.2E-01 C
1024-57-3 Heptachlor Epoxide 1.3E+01 3.6E-01 C 1.1E-03 C 1.1E-02 C 1.1E-01 C
142-82-5 Heptane, N- 1.0E+00 2.8E+03 N 8.3E+01 N 8.3E+01 N 8.3E+01 N Yes
87-82-1 Hexabromobenzene
68631-49-2 Hexabromodiphenyl ether, 2,2',4,4',5,5'- (BDE-153)
118-74-1 Hexachlorobenzene 8.8E-01 2.0E+00 C 6.1E-03 C 6.1E-02 C 6.1E-01 C
87-68-3 Hexachlorobutadiene 3.0E+00 4.3E+01 C 1.3E-01 C 1.3E+00 C 1.3E+01 C
Page 6 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
319-84-6 Hexachlorocyclohexane, Alpha- Not Volatile Not Volatile 1.6E-03 C 1.6E-02 C 1.6E-01 C319-85-7 Hexachlorocyclohexane, Beta- Not Volatile Not Volatile 5.3E-03 C 5.3E-02 C 5.3E-01 C
58-89-9 Hexachlorocyclohexane, Gamma-
(Lindane)Not Volatile Not Volatile 9.1E-03 C 9.1E-02 C 9.1E-01 C
608-73-1 Hexachlorocyclohexane, Technical Not Volatile Not Volatile 5.5E-03 C 5.5E-02 C 5.5E-01 C
77-47-4 Hexachlorocyclopentadiene 3.8E-02 1.4E+00 N 4.2E-02 N 4.2E-02 N 4.2E-02 N Yes
67-72-1 Hexachloroethane 1.6E+01 8.5E+01 C 2.6E-01 C 2.6E+00 C 6.3E+00 N Yes70-30-4 Hexachlorophene
121-82-4 Hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX)
822-06-0 Hexamethylene Diisocyanate, 1,6- 1.1E+00 7.0E-02 N 2.1E-03 N 2.1E-03 N 2.1E-03 N Yes
680-31-9 Hexamethylphosphoramide
110-54-3 Hexane, N- 2.0E+00 4.9E+03 N 1.5E+02 N 1.5E+02 N 1.5E+02 N Yes
124-04-9 Hexanedioic Acid591-78-6 Hexanone, 2- 1.6E+03 2.1E+02 N 6.3E+00 N 6.3E+00 N 6.3E+00 N Yes51235-04-2 Hexazinone
78587-05-0 Hexythiazox
67485-29-4 Hydramethylnon
302-01-2 Hydrazine 2.3E+02 1.9E-01 C 5.7E-04 C 5.7E-03 C 6.3E-03 N Yes
10034-93-2 Hydrazine Sulfate Not Volatile Not Volatile 5.7E-04 C 5.7E-03 C 5.7E-02 C
7647-01-0 Hydrogen Chloride 5.0E-08 1.4E+02 N 4.2E+00 N 4.2E+00 N 4.2E+00 N Yes
7664-39-3 Hydrogen Fluoride 6.9E+02 9.7E+01 N 2.9E+00 N 2.9E+00 N 2.9E+00 N Yes
7783-06-4 Hydrogen Sulfide 1.2E+00 1.4E+01 N 4.2E-01 N 4.2E-01 N 4.2E-01 N Yes123-31-9 Hydroquinone35554-44-0 Imazalil
81335-37-7 Imazaquin
81335-77-5 Imazethapyr
7553-56-2 Iodine
36734-19-7 Iprodione
7439-89-6 Iron
78-83-1 Isobutyl Alcohol78-59-1 Isophorone Not Volatile Not Volatile 4.2E+02 N 4.2E+02 N 4.2E+02 N Yes33820-53-0 Isopropalin
67-63-0 Isopropanol 1.3E+05 1.4E+03 N 4.2E+01 N 4.2E+01 N 4.2E+01 N Yes
1832-54-8 Isopropyl Methyl Phosphonic Acid
82558-50-7 Isoxaben
E1737665 JP-7 1.5E+02 2.1E+03 N 6.3E+01 N 6.3E+01 N 6.3E+01 N Yes
77501-63-4 Lactofen
Lead Compounds7758-97-6 ~Lead Chromate Not Volatile Not Volatile 6.8E-06 C 6.8E-05 C 6.8E-04 C Yes7446-27-7 ~Lead Phosphate Not Volatile Not Volatile 2.3E-01 C 2.3E+00 C 2.3E+01 C
301-04-2 ~Lead acetate Not Volatile Not Volatile 2.3E-01 C 2.3E+00 C 2.3E+01 C
7439-92-1 ~Lead and Compounds Not Volatile Not Volatile 1.5E-01 N 1.5E-01 N 1.5E-01 N Yes
1335-32-6 ~Lead subacetate Not Volatile Not Volatile 2.3E-01 C 2.3E+00 C 2.3E+01 C
78-00-2 ~Tetraethyl Lead
541-25-3 Lewisite
330-55-2 Linuron
7439-93-2 Lithium94-74-6 MCPA94-81-5 MCPB
93-65-2 MCPP
121-75-5 Malathion
108-31-6 Maleic Anhydride Not Volatile Not Volatile 1.5E-01 N 1.5E-01 N 1.5E-01 N Yes
123-33-1 Maleic Hydrazide
109-77-3 Malononitrile
8018-01-7 Mancozeb12427-38-2 Maneb7439-96-5 Manganese (Diet) Not Volatile Not Volatile 1.0E-02 N 1.0E-02 N 1.0E-02 N Yes
7439-96-5 Manganese (Non-diet) Not Volatile Not Volatile 1.0E-02 N 1.0E-02 N 1.0E-02 N Yes
950-10-7 Mephosfolan
Page 7 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
24307-26-4 Mepiquat Chloride149-30-4 Mercaptobenzothiazole, 2-
Mercury Compounds
7487-94-7 ~Mercuric Chloride (and other Mercury
salts)Not Volatile Not Volatile 6.3E-02 N 6.3E-02 N 6.3E-02 N Yes
7439-97-6 ~Mercury (elemental) 1.8E-01 2.1E+00 N 6.3E-02 N 6.3E-02 N 6.3E-02 N Yes
22967-92-6 ~Methyl Mercury62-38-4 ~Phenylmercuric Acetate150-50-5 Merphos
78-48-8 Merphos Oxide
57837-19-1 Metalaxyl
126-98-7 Methacrylonitrile 6.2E+02 2.1E+02 N 6.3E+00 N 6.3E+00 N 6.3E+00 N Yes
10265-92-6 Methamidophos
67-56-1 Methanol 2.2E+07 1.4E+05 N 4.2E+03 N 4.2E+03 N 4.2E+03 N Yes
950-37-8 Methidathion16752-77-5 Methomyl99-59-2 Methoxy-5-nitroaniline, 2- Not Volatile Not Volatile 2.0E-01 C 2.0E+00 C 2.0E+01 C
72-43-5 Methoxychlor
110-49-6 Methoxyethanol Acetate, 2- 1.6E+04 7.0E+00 N 2.1E-01 N 2.1E-01 N 2.1E-01 N Yes
109-86-4 Methoxyethanol, 2- 3.1E+05 1.4E+02 N 4.2E+00 N 4.2E+00 N 4.2E+00 N Yes
79-20-9 Methyl Acetate
96-33-3 Methyl Acrylate 5.1E+02 1.4E+02 N 4.2E+00 N 4.2E+00 N 4.2E+00 N Yes
78-93-3 Methyl Ethyl Ketone (2-Butanone) 4.5E+05 3.5E+04 N 1.0E+03 N 1.0E+03 N 1.0E+03 N Yes
60-34-4 Methyl Hydrazine 3.4E+01 1.4E-01 N 2.8E-03 C 4.2E-03 N 4.2E-03 N Yes
108-10-1 Methyl Isobutyl Ketone (4-methyl-2-pentanone)1.1E+05 2.1E+04 N 6.3E+02 N 6.3E+02 N 6.3E+02 N Yes
624-83-9 Methyl Isocyanate 5.5E+00 7.0E+00 N 2.1E-01 N 2.1E-01 N 2.1E-01 N Yes
80-62-6 Methyl Methacrylate 1.1E+04 4.9E+03 N 1.5E+02 N 1.5E+02 N 1.5E+02 N Yes
298-00-0 Methyl Parathion
993-13-5 Methyl Phosphonic Acid
25013-15-4 Methyl Styrene (Mixed Isomers) 7.8E+01 2.8E+02 N 8.3E+00 N 8.3E+00 N 8.3E+00 N Yes66-27-3 Methyl methanesulfonate Not Volatile Not Volatile 1.0E-01 C 1.0E+00 C 1.0E+01 C1634-04-4 Methyl tert-Butyl Ether (MTBE) 4.5E+03 3.6E+03 C 1.1E+01 C 1.1E+02 C 6.3E+02 N Yes
615-45-2 Methyl-1,4-benzenediamine
dihydrochloride, 2-
99-55-8 Methyl-5-Nitroaniline, 2-
70-25-7 Methyl-N-nitro-N-nitrosoguanidine, N- Not Volatile Not Volatile 1.2E-03 C 1.2E-02 C 1.2E-01 C
636-21-5 Methylaniline Hydrochloride, 2- Not Volatile Not Volatile 7.6E-02 C 7.6E-01 C 7.6E+00 C124-58-3 Methylarsonic acid
74612-12-7 Methylbenzene,1-4-diamine monohydrochloride, 2-
615-50-9 Methylbenzene-1,4-diamine sulfate, 2-
56-49-5 Methylcholanthrene, 3- Not Volatile Not Volatile 1.6E-04 C 1.6E-03 C 1.6E-02 C
75-09-2 Methylene Chloride 9.4E+02 4.2E+03 N 1.0E+02 C 1.3E+02 N 1.3E+02 N Yes
101-14-4 Methylene-bis(2-chloroaniline), 4,4'- Not Volatile Not Volatile 2.4E-03 C 2.4E-02 C 2.4E-01 C
101-61-1 Methylene-bis(N,N-dimethyl) Aniline, 4,4'-Not Volatile Not Volatile 2.2E-01 C 2.2E+00 C 2.2E+01 C
101-77-9 Methylenebisbenzenamine, 4,4'- Not Volatile Not Volatile 6.1E-03 C 6.1E-02 C 6.1E-01 C Yes
101-68-8 Methylenediphenyl Diisocyanate Not Volatile Not Volatile 1.3E-01 N 1.3E-01 N 1.3E-01 N Yes
98-83-9 Methylstyrene, Alpha-
51218-45-2 Metolachlor
21087-64-9 Metribuzin
74223-64-6 Metsulfuron-methyl8012-95-1 Mineral oils2385-85-5 Mirex 1.7E-01 1.8E-01 C 5.5E-04 C 5.5E-03 C 5.5E-02 C
2212-67-1 Molinate
7439-98-7 Molybdenum
10599-90-3 Monochloramine
100-61-8 Monomethylaniline
88671-89-0 Myclobutanil
Page 8 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
74-31-7 N,N'-Diphenyl-1,4-benzenediamine300-76-5 Naled
64742-95-6 Naphtha, High Flash Aromatic (HFAN) 1.2E+03 7.0E+02 N 2.1E+01 N 2.1E+01 N 2.1E+01 N Yes
91-59-8 Naphthylamine, 2-
15299-99-7 Napropamide
373-02-4 Nickel Acetate Not Volatile Not Volatile 2.9E-03 N 2.9E-03 N 2.9E-03 N Yes
3333-67-3 Nickel Carbonate Not Volatile Not Volatile 2.9E-03 N 2.9E-03 N 2.9E-03 N Yes
13463-39-3 Nickel Carbonyl 1.4E-04 9.7E-02 N 2.9E-03 N 2.9E-03 N 2.9E-03 N Yes12054-48-7 Nickel Hydroxide Not Volatile Not Volatile 2.9E-03 N 2.9E-03 N 2.9E-03 N Yes1313-99-1 Nickel Oxide Not Volatile Not Volatile 4.2E-03 N 4.2E-03 N 4.2E-03 N Yes
E715532 Nickel Refinery Dust Not Volatile Not Volatile 2.9E-03 N 2.9E-03 N 2.9E-03 N Yes
7440-02-0 Nickel Soluble Salts Not Volatile Not Volatile 1.1E-02 C 1.9E-02 N 1.9E-02 N Yes
12035-72-2 Nickel Subsulfide Not Volatile Not Volatile 2.9E-03 N 2.9E-03 N 2.9E-03 N Yes
1271-28-9 Nickelocene Not Volatile Not Volatile 2.9E-03 N 2.9E-03 N 2.9E-03 N Yes
14797-55-8 Nitrate
E701177 Nitrate + Nitrite (as N)14797-65-0 Nitrite88-74-4 Nitroaniline, 2- Not Volatile Not Volatile 1.0E-02 N 1.0E-02 N 1.0E-02 N Yes
100-01-6 Nitroaniline, 4- Not Volatile Not Volatile 1.3E+00 N 1.3E+00 N 1.3E+00 N Yes
98-95-3 Nitrobenzene 7.2E+02 2.3E+01 C 7.0E-02 C 7.0E-01 C 1.9E+00 N Yes
9004-70-0 Nitrocellulose
67-20-9 Nitrofurantoin
59-87-0 Nitrofurazone Not Volatile Not Volatile 7.6E-03 C 7.6E-02 C 7.6E-01 C
55-63-0 Nitroglycerin
556-88-7 Nitroguanidine75-52-5 Nitromethane 8.9E+02 3.5E+01 N 3.2E-01 C 1.0E+00 N 1.0E+00 N Yes79-46-9 Nitropropane, 2- 2.1E+00 3.5E-01 C 1.0E-03 C 1.0E-02 C 1.0E-01 C Yes
759-73-9 Nitroso-N-ethylurea, N- Not Volatile Not Volatile 1.3E-04 C 1.3E-03 C 1.3E-02 C
684-93-5 Nitroso-N-methylurea, N- Not Volatile Not Volatile 3.0E-05 C 3.0E-04 C 3.0E-03 C
924-16-3 Nitroso-di-N-butylamine, N- 3.3E+01 5.8E-01 C 1.8E-03 C 1.8E-02 C 1.8E-01 C
621-64-7 Nitroso-di-N-propylamine, N- Not Volatile Not Volatile 1.4E-03 C 1.4E-02 C 1.4E-01 C
1116-54-7 Nitrosodiethanolamine, N- Not Volatile Not Volatile 3.5E-03 C 3.5E-02 C 3.5E-01 C
55-18-5 Nitrosodiethylamine, N- Not Volatile Not Volatile 2.4E-05 C 2.4E-04 C 2.4E-03 C62-75-9 Nitrosodimethylamine, N- 9.7E+00 2.4E-02 C 7.2E-05 C 7.2E-04 C 7.2E-03 C Yes86-30-6 Nitrosodiphenylamine, N- Not Volatile Not Volatile 1.1E+00 C 1.1E+01 C 1.1E+02 C
10595-95-6 Nitrosomethylethylamine, N- 7.6E+01 1.5E-01 C 4.5E-04 C 4.5E-03 C 4.5E-02 C
59-89-2 Nitrosomorpholine [N-] Not Volatile Not Volatile 1.5E-03 C 1.5E-02 C 1.5E-01 C
100-75-4 Nitrosopiperidine [N-] Not Volatile Not Volatile 1.0E-03 C 1.0E-02 C 1.0E-01 C
930-55-2 Nitrosopyrrolidine, N- Not Volatile Not Volatile 4.6E-03 C 4.6E-02 C 4.6E-01 C
99-08-1 Nitrotoluene, m-
88-72-2 Nitrotoluene, o-99-99-0 Nitrotoluene, p-111-84-2 Nonane, n- 3.0E-02 1.4E+02 N 4.2E+00 N 4.2E+00 N 4.2E+00 N Yes
27314-13-2 Norflurazon
32536-52-0 Octabromodiphenyl Ether
2691-41-0 Octahydro-1,3,5,7-tetranitro-1,3,5,7-
tetrazocine (HMX)
152-16-9 Octamethylpyrophosphoramide
19044-88-3 Oryzalin19666-30-9 Oxadiazon23135-22-0 Oxamyl
42874-03-3 Oxyfluorfen
76738-62-0 Paclobutrazol
1910-42-5 Paraquat Dichloride
56-38-2 Parathion
1114-71-2 Pebulate
40487-42-1 Pendimethalin32534-81-9 Pentabromodiphenyl Ether
60348-60-9 Pentabromodiphenyl ether, 2,2',4,4',5- (BDE-99)
Page 9 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
608-93-5 Pentachlorobenzene76-01-7 Pentachloroethane
82-68-8 Pentachloronitrobenzene
87-86-5 Pentachlorophenol Not Volatile Not Volatile 5.5E-01 C 5.5E+00 C 5.5E+01 C
78-11-5 Pentaerythritol tetranitrate (PETN)
109-66-0 Pentane, n- 4.1E+00 7.0E+03 N 2.1E+02 N 2.1E+02 N 2.1E+02 N Yes
Perchlorates
7790-98-9 ~Ammonium Perchlorate7791-03-9 ~Lithium Perchlorate14797-73-0 ~Perchlorate and Perchlorate Salts
7778-74-7 ~Potassium Perchlorate
7601-89-0 ~Sodium Perchlorate
375-73-5 Perfluorobutane sulfonic acid (PFBS)
45187-15-3 Perfluorobutanesulfonate
52645-53-1 Permethrin
62-44-2 Phenacetin Not Volatile Not Volatile 4.5E+00 C 4.5E+01 C 4.5E+02 C13684-63-4 Phenmedipham108-95-2 Phenol Not Volatile Not Volatile 4.2E+01 N 4.2E+01 N 4.2E+01 N Yes
114-26-1 Phenol, 2-(1-methylethoxy)-,
methylcarbamate
92-84-2 Phenothiazine
103-72-0 Phenyl Isothiocyanate
108-45-2 Phenylenediamine, m-
95-54-5 Phenylenediamine, o-106-50-3 Phenylenediamine, p-90-43-7 Phenylphenol, 2-
298-02-2 Phorate
75-44-5 Phosgene 9.2E-02 2.1E+00 N 6.3E-02 N 6.3E-02 N 6.3E-02 N Yes
732-11-6 Phosmet
Phosphates, Inorganic
13776-88-0 ~Aluminum metaphosphate
68333-79-9 ~Ammonium polyphosphate7790-76-3 ~Calcium pyrophosphate7783-28-0 ~Diammonium phosphate
7757-93-9 ~Dicalcium phosphate
7782-75-4 ~Dimagnesium phosphate
7758-11-4 ~Dipotassium phosphate
7558-79-4 ~Disodium phosphate
13530-50-2 ~Monoaluminum phosphate
7722-76-1 ~Monoammonium phosphate7758-23-8 ~Monocalcium phosphate7757-86-0 ~Monomagnesium phosphate
7778-77-0 ~Monopotassium phosphate
7558-80-7 ~Monosodium phosphate
8017-16-1 ~Polyphosphoric acid
13845-36-8 ~Potassium tripolyphosphate
7758-16-9 ~Sodium acid pyrophosphate
7785-88-8 ~Sodium aluminum phosphate (acidic)
10279-59-1 ~Sodium aluminum phosphate (anhydrous)
10305-76-7 ~Sodium aluminum phosphate
(tetrahydrate)
10124-56-8 ~Sodium hexametaphosphate
68915-31-1 ~Sodium polyphosphate
7785-84-4 ~Sodium trimetaphosphate7758-29-4 ~Sodium tripolyphosphate7320-34-5 ~Tetrapotassium phosphate
7722-88-5 ~Tetrasodium pyrophosphate
Page 10 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
15136-87-5 ~Trialuminum sodium tetra decahydrogenoctaorthophosphate (dihydrate)
7758-87-4 ~Tricalcium phosphate
7757-87-1 ~Trimagnesium phosphate
7778-53-2 ~Tripotassium phosphate
7601-54-9 ~Trisodium phosphate7803-51-2 Phosphine 6.3E-02 2.1E+00 N 6.3E-02 N 6.3E-02 N 6.3E-02 N Yes7664-38-2 Phosphoric Acid Not Volatile Not Volatile 2.1E+00 N 2.1E+00 N 2.1E+00 N Yes
7723-14-0 Phosphorus, White
Phthalates
117-81-7 ~Bis(2-ethylhexyl)phthalate Not Volatile Not Volatile 1.2E+00 C 1.2E+01 C 1.2E+02 C
85-68-7 ~Butyl Benzyl Phthalate
85-70-1 ~Butylphthalyl Butylglycolate
84-74-2 ~Dibutyl Phthalate84-66-2 ~Diethyl Phthalate120-61-6 ~Dimethylterephthalate
117-84-0 ~Octyl Phthalate, di-N-
100-21-0 ~Phthalic Acid, P-
85-44-9 ~Phthalic Anhydride Not Volatile Not Volatile 4.2E+00 N 4.2E+00 N 4.2E+00 N Yes
1918-02-1 Picloram
96-91-3 Picramic Acid (2-Amino-4,6-
dinitrophenol)
88-89-1 Picric Acid (2,4,6-Trinitrophenol)29232-93-7 Pirimiphos, Methyl
59536-65-1 Polybrominated Biphenyls Not Volatile Not Volatile 3.3E-04 C 3.3E-03 C 3.3E-02 C
Polychlorinated Biphenyls (PCBs)
12674-11-2 ~Aroclor 1016 1.7E+02 4.7E+01 C 1.4E-01 C 1.4E+00 C 1.4E+01 C
11104-28-2 ~Aroclor 1221 5.3E+00 1.6E+00 C 4.9E-03 C 4.9E-02 C 4.9E-01 C
11141-16-5 ~Aroclor 1232 1.6E+00 1.6E+00 C 4.9E-03 C 4.9E-02 C 4.9E-01 C
53469-21-9 ~Aroclor 1242 3.5E+00 1.6E+00 C 4.9E-03 C 4.9E-02 C 4.9E-01 C12672-29-6 ~Aroclor 1248 2.7E+00 1.6E+00 C 4.9E-03 C 4.9E-02 C 4.9E-01 C11097-69-1 ~Aroclor 1254 4.3E+00 1.6E+00 C 4.9E-03 C 4.9E-02 C 4.9E-01 C
11096-82-5 ~Aroclor 1260 3.6E+00 1.6E+00 C 4.9E-03 C 4.9E-02 C 4.9E-01 C
11126-42-4 ~Aroclor 5460
39635-31-9 ~Heptachlorobiphenyl, 2,3,3',4,4',5,5'-
(PCB 189)1.2E+01 8.5E-01 C 2.6E-03 C 2.6E-02 C 2.6E-01 C Yes
52663-72-6 ~Hexachlorobiphenyl, 2,3',4,4',5,5'- (PCB 167)9.1E+00 8.5E-01 C 2.6E-03 C 2.6E-02 C 2.6E-01 C Yes
69782-90-7 ~Hexachlorobiphenyl, 2,3,3',4,4',5'-
(PCB 157)3.9E+00 8.5E-01 C 2.6E-03 C 2.6E-02 C 2.6E-01 C Yes
38380-08-4 ~Hexachlorobiphenyl, 2,3,3',4,4',5- (PCB
156)4.4E+00 8.5E-01 C 2.6E-03 C 2.6E-02 C 2.6E-01 C Yes
32774-16-6 ~Hexachlorobiphenyl, 3,3',4,4',5,5'- (PCB 169)9.1E-03 8.5E-04 C 2.6E-06 C 2.6E-05 C 2.6E-04 C Yes
65510-44-3 ~Pentachlorobiphenyl, 2',3,4,4',5- (PCB
123)3.3E+00 8.5E-01 C 2.6E-03 C 2.6E-02 C 2.6E-01 C Yes
31508-00-6 ~Pentachlorobiphenyl, 2,3',4,4',5- (PCB
118)2.2E+00 8.5E-01 C 2.6E-03 C 2.6E-02 C 2.6E-01 C Yes
32598-14-4 ~Pentachlorobiphenyl, 2,3,3',4,4'- (PCB 105)2.2E+00 8.5E-01 C 2.6E-03 C 2.6E-02 C 2.6E-01 C Yes
74472-37-0 ~Pentachlorobiphenyl, 2,3,4,4',5- (PCB
114)6.8E+00 8.5E-01 C 2.6E-03 C 2.6E-02 C 2.6E-01 C Yes
57465-28-8 ~Pentachlorobiphenyl, 3,3',4,4',5- (PCB 126)9.5E-04 2.5E-04 C 7.4E-07 C 7.4E-06 C 7.4E-05 C Yes
1336-36-3 ~Polychlorinated Biphenyls (high risk) 2.9E+00 1.6E+00 C 4.9E-03 C 4.9E-02 C 4.9E-01 C
1336-36-3 ~Polychlorinated Biphenyls (low risk) 1.7E+01 9.4E+00 C 2.8E-02 C 2.8E-01 C 2.8E+00 C
1336-36-3 ~Polychlorinated Biphenyls (lowest risk) 8.3E+01 4.7E+01 C 1.4E-01 C 1.4E+00 C 1.4E+01 C
32598-13-3 ~Tetrachlorobiphenyl, 3,3',4,4'- (PCB 77) Not Volatile Not Volatile 7.4E-04 C 7.4E-03 C 7.4E-02 C Yes
Page 11 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
70362-50-4 ~Tetrachlorobiphenyl, 3,4,4',5- (PCB 81) 2.8E-01 8.5E-02 C 2.6E-04 C 2.6E-03 C 2.6E-02 C Yes
9016-87-9 Polymeric Methylene Diphenyl
Diisocyanate (PMDI)Not Volatile Not Volatile 1.3E-01 N 1.3E-01 N 1.3E-01 N Yes
Polynuclear Aromatic Hydrocarbons (PAHs)
83-32-9 ~Acenaphthene
120-12-7 ~Anthracene
56-55-3 ~Benz[a]anthracene 3.4E+02 5.6E+00 C 1.7E-02 C 1.7E-01 C 1.7E+00 C
205-82-3 ~Benzo(j)fluoranthene Not Volatile Not Volatile 2.6E-02 C 2.6E-01 C 2.6E+00 C
50-32-8 ~Benzo[a]pyrene Not Volatile Not Volatile 4.2E-04 N 4.2E-04 N 4.2E-04 N Yes
205-99-2 ~Benzo[b]fluoranthene Not Volatile Not Volatile 1.7E-02 C 1.7E-01 C 1.7E+00 C
207-08-9 ~Benzo[k]fluoranthene Not Volatile Not Volatile 1.7E-01 C 1.7E+00 C 1.7E+01 C91-58-7 ~Chloronaphthalene, Beta-218-01-9 ~Chrysene Not Volatile Not Volatile 1.7E+00 C 1.7E+01 C 1.7E+02 C
53-70-3 ~Dibenz[a,h]anthracene Not Volatile Not Volatile 1.7E-03 C 1.7E-02 C 1.7E-01 C
192-65-4 ~Dibenzo(a,e)pyrene Not Volatile Not Volatile 2.6E-03 C 2.6E-02 C 2.6E-01 C
57-97-6 ~Dimethylbenz(a)anthracene, 7,12- Not Volatile Not Volatile 1.4E-05 C 1.4E-04 C 1.4E-03 C
206-44-0 ~Fluoranthene
86-73-7 ~Fluorene
193-39-5 ~Indeno[1,2,3-cd]pyrene Not Volatile Not Volatile 1.7E-02 C 1.7E-01 C 1.7E+00 C
90-12-0 ~Methylnaphthalene, 1-91-57-6 ~Methylnaphthalene, 2-91-20-3 ~Naphthalene 3.5E+01 2.1E+01 N 8.3E-02 C 6.3E-01 N 6.3E-01 N Yes
57835-92-4 ~Nitropyrene, 4- Not Volatile Not Volatile 2.6E-02 C 2.6E-01 C 2.6E+00 C
129-00-0 ~Pyrene
29420-49-3 Potassium Perfluorobutane Sulfonate
67747-09-5 Prochloraz
26399-36-0 Profluralin
1610-18-0 Prometon7287-19-6 Prometryn1918-16-7 Propachlor
709-98-8 Propanil
2312-35-8 Propargite
107-19-7 Propargyl Alcohol
139-40-2 Propazine
122-42-9 Propham
60207-90-1 Propiconazole123-38-6 Propionaldehyde 5.6E+02 5.6E+01 N 1.7E+00 N 1.7E+00 N 1.7E+00 N Yes103-65-1 Propyl benzene 4.9E+02 7.0E+03 N 2.1E+02 N 2.1E+02 N 2.1E+02 N Yes
115-07-1 Propylene 7.8E+01 2.1E+04 N 6.3E+02 N 6.3E+02 N 6.3E+02 N Yes
57-55-6 Propylene Glycol
6423-43-4 Propylene Glycol Dinitrate Not Volatile Not Volatile 5.6E-02 N 5.6E-02 N 5.6E-02 N Yes
107-98-2 Propylene Glycol Monomethyl Ether 1.1E+07 1.4E+04 N 4.2E+02 N 4.2E+02 N 4.2E+02 N Yes
75-56-9 Propylene Oxide 2.2E+03 2.1E+02 N 7.6E-01 C 6.3E+00 N 6.3E+00 N Yes
23950-58-5 Propyzamide
110-86-1 Pyridine13593-03-8 Quinalphos91-22-5 Quinoline
76578-14-8 Quizalofop-ethyl
E715557 Refractory Ceramic Fibers Not Volatile Not Volatile 6.3E+00 N 6.3E+00 N 6.3E+00 N Yes
10453-86-8 Resmethrin
299-84-3 Ronnel
83-79-4 Rotenone
94-59-7 Safrole Not Volatile Not Volatile 1.6E-02 C 1.6E-01 C 1.6E+00 C7783-00-8 Selenious Acid7782-49-2 Selenium Not Volatile Not Volatile 4.2E+00 N 4.2E+00 N 4.2E+00 N Yes
7446-34-6 Selenium Sulfide Not Volatile Not Volatile 4.2E+00 N 4.2E+00 N 4.2E+00 N Yes
74051-80-2 Sethoxydim
7631-86-9 Silica (crystalline, respirable) Not Volatile Not Volatile 6.3E-01 N 6.3E-01 N 6.3E-01 N Yes
Page 12 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
7440-22-4 Silver122-34-9 Simazine
62476-59-9 Sodium Acifluorfen
26628-22-8 Sodium Azide
10588-01-9 Sodium Dichromate Not Volatile Not Volatile 6.8E-06 C 6.8E-05 C 6.8E-04 C Yes
148-18-5 Sodium Diethyldithiocarbamate
7681-49-4 Sodium Fluoride Not Volatile Not Volatile 2.7E+00 N 2.7E+00 N 2.7E+00 N Yes
62-74-8 Sodium Fluoroacetate13718-26-8 Sodium Metavanadate13472-45-2 Sodium Tungstate
10213-10-2 Sodium Tungstate Dihydrate
961-11-5 Stirofos (Tetrachlorovinphos)
7789-06-2 Strontium Chromate Not Volatile Not Volatile 6.8E-06 C 6.8E-05 C 6.8E-04 C Yes
7440-24-6 Strontium, Stable
57-24-9 Strychnine
100-42-5 Styrene 1.9E+03 7.0E+03 N 2.1E+02 N 2.1E+02 N 2.1E+02 N YesNA Styrene-Acrylonitrile (SAN) Trimer126-33-0 Sulfolane Not Volatile Not Volatile 4.2E-01 N 4.2E-01 N 4.2E-01 N Yes
80-07-9 Sulfonylbis(4-chlorobenzene), 1,1'-
7446-11-9 Sulfur Trioxide 7.0E+00 N 2.1E-01 N 2.1E-01 N 2.1E-01 N Yes
7664-93-9 Sulfuric Acid Not Volatile Not Volatile 2.1E-01 N 2.1E-01 N 2.1E-01 N Yes
140-57-8
Sulfurous acid, 2-chloroethyl 2-[4-(1,1-
dimethylethyl)phenoxy]-1-methylethyl
ester
Not Volatile Not Volatile 4.0E-01 C 4.0E+00 C 4.0E+01 C
21564-17-0 TCMTB34014-18-1 Tebuthiuron
3383-96-8 Temephos
5902-51-2 Terbacil
13071-79-9 Terbufos
886-50-0 Terbutryn
5436-43-1 Tetrabromodiphenyl ether, 2,2',4,4'- (BDE-47)
95-94-3 Tetrachlorobenzene, 1,2,4,5-
630-20-6 Tetrachloroethane, 1,1,1,2- 3.7E+01 1.3E+02 C 3.8E-01 C 3.8E+00 C 3.8E+01 C
79-34-5 Tetrachloroethane, 1,1,2,2- 3.2E+01 1.6E+01 C 4.8E-02 C 4.8E-01 C 4.8E+00 C
127-18-4 Tetrachloroethylene 1.2E+01 2.8E+02 N 8.3E+00 N 8.3E+00 N 8.3E+00 N Yes
58-90-2 Tetrachlorophenol, 2,3,4,6-
5216-25-1 Tetrachlorotoluene, p- alpha, alpha, alpha-
3689-24-5 Tetraethyl Dithiopyrophosphate
811-97-2 Tetrafluoroethane, 1,1,1,2- 8.2E+03 5.6E+05 N 1.7E+04 N 1.7E+04 N 1.7E+04 N Yes
479-45-8 Tetryl (Trinitrophenylmethylnitramine)
1314-32-5 Thallic Oxide
10102-45-1 Thallium (I) Nitrate
7440-28-0 Thallium (Soluble Salts)
563-68-8 Thallium Acetate
6533-73-9 Thallium Carbonate7791-12-0 Thallium Chloride12039-52-0 Thallium Selenite
7446-18-6 Thallium Sulfate
79277-27-3 Thifensulfuron-methyl
28249-77-6 Thiobencarb
111-48-8 Thiodiglycol
39196-18-4 Thiofanox
23564-05-8 Thiophanate, Methyl137-26-8 Thiram7440-31-5 Tin
7550-45-0 Titanium Tetrachloride 7.0E-01 N 2.1E-02 N 2.1E-02 N 2.1E-02 N Yes
108-88-3 Toluene 3.8E+03 3.5E+04 N 1.0E+03 N 1.0E+03 N 1.0E+03 N Yes
584-84-9 Toluene-2,4-diisocyanate 3.7E+00 5.6E-02 N 1.7E-03 N 1.7E-03 N 1.7E-03 N Yes
Page 13 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
95-70-5 Toluene-2,5-diamine91-08-7 Toluene-2,6-diisocyanate 3.7E+00 5.6E-02 N 1.7E-03 N 1.7E-03 N 1.7E-03 N Yes
95-53-4 Toluidine, o- (Methylaniline, 2-) Not Volatile Not Volatile 5.5E-02 C 5.5E-01 C 5.5E+00 C
106-49-0 Toluidine, p-
E1790670 Total Petroleum Hydrocarbons (Aliphatic
High)
E1790666 Total Petroleum Hydrocarbons (Aliphatic Low)1.7E+00 4.2E+03 N 1.3E+02 N 1.3E+02 N 1.3E+02 N Yes
E1790668 Total Petroleum Hydrocarbons (Aliphatic
Medium)1.5E-01 7.0E+02 N 2.1E+01 N 2.1E+01 N 2.1E+01 N Yes
E1790676 Total Petroleum Hydrocarbons (Aromatic
High)
E1790672 Total Petroleum Hydrocarbons (Aromatic Low)2.8E+01 2.1E+02 N 6.3E+00 N 6.3E+00 N 6.3E+00 N Yes
E1790674 Total Petroleum Hydrocarbons (Aromatic
Medium)3.2E+01 2.1E+01 N 6.3E-01 N 6.3E-01 N 6.3E-01 N Yes
8001-35-2 Toxaphene Not Volatile Not Volatile 8.8E-03 C 8.8E-02 C 8.8E-01 C
66841-25-6 Tralomethrin
688-73-3 Tri-n-butyltin102-76-1 Triacetin43121-43-3 Triadimefon
2303-17-5 Triallate
82097-50-5 Triasulfuron
101200-48-0 Tribenuron-methyl
615-54-3 Tribromobenzene, 1,2,4-
118-79-6 Tribromophenol, 2,4,6-
126-73-8 Tributyl PhosphateE1790678 Tributyltin Compounds56-35-9 Tributyltin Oxide
76-13-1 Trichloro-1,2,2-trifluoroethane, 1,1,2- 4.8E+01 3.5E+04 N 1.0E+03 N 1.0E+03 N 1.0E+03 N Yes
76-03-9 Trichloroacetic Acid
33663-50-2 Trichloroaniline HCl, 2,4,6-
634-93-5 Trichloroaniline, 2,4,6-
87-61-6 Trichlorobenzene, 1,2,3-
120-82-1 Trichlorobenzene, 1,2,4- 7.2E+00 1.4E+01 N 4.2E-01 N 4.2E-01 N 4.2E-01 N Yes71-55-6 Trichloroethane, 1,1,1- 1.5E+03 3.5E+04 N 1.0E+03 N 1.0E+03 N 1.0E+03 N Yes79-00-5 Trichloroethane, 1,1,2- 1.2E+00 1.4E+00 N 4.2E-02 N 4.2E-02 N 4.2E-02 N Yes
79-01-6 Trichloroethylene 1.0E+00 1.4E+01 N 4.2E-01 N 4.2E-01 N 4.2E-01 N Yes
75-69-4 Trichlorofluoromethane
95-95-4 Trichlorophenol, 2,4,5-
88-06-2 Trichlorophenol, 2,4,6- Not Volatile Not Volatile 9.1E-01 C 9.1E+00 C 9.1E+01 C
93-76-5 Trichlorophenoxyacetic Acid, 2,4,5-
93-72-1 Trichlorophenoxypropionic acid, -2,4,5
598-77-6 Trichloropropane, 1,1,2-96-18-4 Trichloropropane, 1,2,3- 4.5E+00 2.1E+00 N 6.3E-02 N 6.3E-02 N 6.3E-02 N Yes96-19-5 Trichloropropene, 1,2,3- 8.7E-02 2.1E+00 N 6.3E-02 N 6.3E-02 N 6.3E-02 N Yes
1330-78-5 Tricresyl Phosphate (TCP)
58138-08-2 Tridiphane
121-44-8 Triethylamine 2.4E+02 4.9E+01 N 1.5E+00 N 1.5E+00 N 1.5E+00 N Yes
112-27-6 Triethylene Glycol
420-46-2 Trifluoroethane, 1,1,1- 1.3E+02 1.4E+05 N 4.2E+03 N 4.2E+03 N 4.2E+03 N Yes
1582-09-8 Trifluralin512-56-1 Trimethyl Phosphate526-73-8 Trimethylbenzene, 1,2,3- 7.0E+01 4.2E+02 N 1.3E+01 N 1.3E+01 N 1.3E+01 N Yes
95-63-6 Trimethylbenzene, 1,2,4- 5.0E+01 4.2E+02 N 1.3E+01 N 1.3E+01 N 1.3E+01 N Yes
108-67-8 Trimethylbenzene, 1,3,5- 3.5E+01 4.2E+02 N 1.3E+01 N 1.3E+01 N 1.3E+01 N Yes
25167-70-8 Trimethylpentene, 2,4,4-
99-35-4 Trinitrobenzene, 1,3,5-
118-96-7 Trinitrotoluene, 2,4,6-
791-28-6 Triphenylphosphine Oxide
Page 14 or 15
CAS # Chemical Name:
Ground Water Screening Level
(GWSL) ug/L
TCR=1.0E-05
THQ=0.2
Sub-slab and Exterior Soil Gas Screening
Level (SGSL) ug/m3
TCR=1.0E-05THQ=0.2
Basis
IASL (A)
ug/m3
TCR=1.0E-06
THQ=0.2
Basis
IASL (B)
ug/m3
TCR=1.0E-05
THQ=0.2
Basis
IASL (C)3
ug/m3
TCR=1.0E-04THQ=0.2
Basis
Does Chemical Have a Non-
Cancer Effect?4
North Carolina Department of Environmental Quality
Residential Vapor Intrusion Screening Levels
October 2017
(based on June 2017 USEPA Regional Screening Tables)
13674-87-8 Tris(1,3-Dichloro-2-propyl) Phosphate13674-84-5 Tris(1-chloro-2-propyl)phosphate
126-72-7 Tris(2,3-dibromopropyl)phosphate 4.8E+01 1.4E+00 C 4.3E-03 C 4.3E-02 C 4.3E-01 C
115-96-8 Tris(2-chloroethyl)phosphate
78-42-2 Tris(2-ethylhexyl)phosphate
7440-33-7 Tungsten
E715565 Uranium (Soluble Salts) Not Volatile Not Volatile 8.3E-03 N 8.3E-03 N 8.3E-03 N Yes
51-79-6 Urethane Not Volatile Not Volatile 3.5E-03 C 3.5E-02 C 3.5E-01 C1314-62-1 Vanadium Pentoxide Not Volatile Not Volatile 3.4E-04 C 1.5E-03 N 1.5E-03 N Yes7440-62-2 Vanadium and Compounds Not Volatile Not Volatile 2.1E-02 N 2.1E-02 N 2.1E-02 N Yes
1929-77-7 Vernolate
50471-44-8 Vinclozolin
108-05-4 Vinyl Acetate 2.0E+03 1.4E+03 N 4.2E+01 N 4.2E+01 N 4.2E+01 N Yes
593-60-2 Vinyl Bromide 1.2E+00 2.1E+01 N 8.8E-02 C 6.3E-01 N 6.3E-01 N Yes
75-01-4 Vinyl Chloride 1.5E+00 5.6E+01 C 1.7E-01 C 1.7E+00 C 1.7E+01 C Yes
81-81-2 Warfarin106-42-3 Xylene, P- 7.4E+01 7.0E+02 N 2.1E+01 N 2.1E+01 N 2.1E+01 N Yes108-38-3 Xylene, m- 7.1E+01 7.0E+02 N 2.1E+01 N 2.1E+01 N 2.1E+01 N Yes
95-47-6 Xylene, o- 9.8E+01 7.0E+02 N 2.1E+01 N 2.1E+01 N 2.1E+01 N Yes
1330-20-7 Xylenes 7.7E+01 7.0E+02 N 2.1E+01 N 2.1E+01 N 2.1E+01 N Yes
1314-84-7 Zinc Phosphide
7440-66-6 Zinc and Compounds
12122-67-7 Zineb
7440-67-7 Zirconium
1) TCR = Target Cancer Risk; THQ=Target Hazard Quotient; C= Carcinogenic; N = Non-Carcinogenic
2) Indoor Air/Crawlspace Screening Levels at target risk 1.0E-04 (IASL C) to be used if only one carcinogen is present.
3) If more than five compounds with non-cancer effects are present risk should be evaluated using NCDEQ Risk Calculator.
Page 15 or 15

APPENDIX D

LABORATORY REPORT AND CHAIN OF CUSTODY FORM

Page 1 of 28
Page 2 of 28
Page 3 of 28
Page 4 of 28
Page 5 of 28
Page 6 of 28
Page 7 of 28
Page 8 of 28
Page 9 of 28
Page 10 of 28
Page 11 of 28
Page 12 of 28
Page 13 of 28
Page 14 of 28
Page 15 of 28
Page 16 of 28
Page 17 of 28
Page 18 of 28
Page 19 of 28
Page 20 of 28
Page 21 of 28
Page 22 of 28
Page 23 of 28
Page 24 of 28
Page 25 of 28
Page 26 of 28
Page 27 of 28
Page 28 of 28

APPENDIX E

NCDEQ’S RISK CALCULATOR RESULTS
Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
12/19/2017
Prepared By:Rob Hill - RDH Environmental Consulting
North Carolina Department of Environmental Quality
Risk Calculator
Passage Home
500 Hoke Street - Raleigh, NC
Brownfields
NCBF PROJECT NO: 21007-17-092
October 2017
June 2017 EPA RSL Table
North Carolina DEQ Risk Calculator
Table of Contents
Version Date: October 2017
Basis: June 2017 EPA RSL Table
Site ID: NCBF PROJECT NO: 21007-17-092
Exposure Unit ID:
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
Exposure Point ConcentrationsVersion Date: October 2017Basis: June 2017 EPA RSL TableSite ID: NCBF PROJECT NO: 21007-17-092Exposure Unit ID: 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 ConcentrationCAS Number ChemicalMinimum Concentration (Qualifier)Maximum Concentration (Qualifier)UnitsLocation of Maximum ConcentrationDetection FrequencyRange of Detection LimitsConcentration Used for ScreeningBackground ValueScreening Toxicity Value (Screening Level) (n/c)Potential ARAR/TBC ValuePotential ARAR/TBC SourceCOPC Flag (Y/N)Rationale for Selection or Deletion98Max Concentration67-64-1 Acetone 97 98ug/m3SS-1 (Dup)11Max Concentration56-23-5 Carbon Tetrachloride 11 11ug/m3SS-33.1Max Concentration67-66-3 Chloroform 3.1 3.1ug/m3SS-372Max Concentration110-83-8 Cyclohexene 6.2 72ug/m3SS-42.9Max Concentration141-78-6 Ethyl Acetate 2.9 2.9ug/m3SS-49.1Max Concentration100-41-4 Ethylbenzene 3.1 9.1ug/m3SS-42.6Max Concentration109-99-9 ~Tetrahydrofuran 1.6 2.6ug/m3SS-4200Max Concentration142-82-5 Heptane, N- 3.3 200ug/m3SS-4470Max Concentration110-54-3 Hexane, N- 11 470ug/m3SS-472Max Concentration591-78-6 Hexanone, 2- 72 72ug/m3SS-23.8Max Concentration67-63-0 Isopropanol 2.1 3.8ug/m3SS-415Max Concentration78-93-3 Methyl Ethyl Ketone (2-Butanone) 6.9 15ug/m3SS-43.7Max Concentration91-20-3 ~Naphthalene 3.7 3.7ug/m3SS-47.1Max Concentration115-07-1 Propylene 4.6 7.1ug/m3SS-1 (Dup)590Max Concentration127-18-4 Tetrachloroethylene 16 590ug/m3SS-324Max Concentration108-88-3 Toluene 6.3 24ug/m3SS-412Max Concentration71-55-6 Trichloroethane, 1,1,1- 12 12ug/m3SS-33.8Max Concentration75-69-4 Trichlorofluoromethane 3.8 3.8ug/m3SS-311Max Concentration95-63-6 Trimethylbenzene, 1,2,4- 5.3 11ug/m3SS-44.1Max Concentration108-67-8 Trimethylbenzene, 1,3,5- 2.3 4.1ug/m3SS-136Max Concentration106-42-3 Xylene, P- 10 36ug/m3SS-436Max Concentration108-38-3 Xylene, m- 10 36ug/m3SS-413Max Concentration95-47-6 Xylene, o- 3.8 13ug/m3SS-4Input Form 2ESoil Gas Exposure Point Concentration TableNorth Carolina DEQ Risk Calculator
Summary of Risk Assessment Output Output Form 1A
Version Date: October 2017
Basis: June 2017 EPA RSL Table
Site ID: NCBF PROJECT NO: 21007-17-092
Exposure Unit ID:
Receptor Pathway
Carcinogenic
Risk Hazard Index Risk exceeded?
Soil Combined Pathways 0.0E+00 0.0E+00 NO
Groundwater Combined Pathways* 0.0E+00 0.0E+00 NO
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 4.7E-06 6.0E-01 NO
Indoor Air NC NC NC
Groundwater to Indoor Air NC NC NC
Soil Gas to Indoor Air 3.6E-07 4.8E-02 NO
Indoor Air NC NC NC
Pathway Source
Source Soil NC
Source Groundwater NC
Source Soil NC
Source Groundwater NM
PRIMARY CALCULATORS
Resident
Non-Residential Worker
User Defined
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:
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Resident Soil Gas to Indoor Air
Version Date: October 2017
Basis: June 2017 EPA RSL Table
Site ID: NCBF PROJECT NO: 21007-17-092
Exposure Unit ID:
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 98 2.94 - 6.5E+03 9.1E-05
56-23-5 Carbon Tetrachloride 11 0.33 4.7E-01 2.1E+01 7.1E-07 3.2E-03
67-66-3 Chloroform 3.1 0.093 1.2E-01 2.0E+01 7.6E-07 9.1E-04
110-83-8 Cyclohexene 72 2.16 - 2.1E+02 2.1E-03
141-78-6 Ethyl Acetate 2.9 0.087 - 1.5E+01 1.2E-03
100-41-4 Ethylbenzene 9.1 0.273 1.1E+00 2.1E+02 2.4E-07 2.6E-04
109-99-9 ~Tetrahydrofuran 2.6 0.078 - 4.2E+02 3.7E-05
142-82-5 Heptane, N- 200 6 - 8.3E+01 1.4E-02
110-54-3 Hexane, N- 470 14.1 - 1.5E+02 1.9E-02
591-78-6 Hexanone, 2- 72 2.16 - 6.3E+00 6.9E-02
67-63-0 Isopropanol 3.8 0.114 - 4.2E+01 5.5E-04
78-93-3 Methyl Ethyl Ketone (2-Butanone) 15 0.45 - 1.0E+03 8.6E-05
91-20-3 ~Naphthalene 3.7 0.111 8.3E-02 6.3E-01 1.3E-06 3.5E-02
115-07-1 Propylene 7.1 0.213 - 6.3E+02 6.8E-05
127-18-4 Tetrachloroethylene 590 17.7 1.1E+01 8.3E+00 1.6E-06 4.2E-01
108-88-3 Toluene 24 0.72 - 1.0E+03 1.4E-04
71-55-6 Trichloroethane, 1,1,1- 12 0.36 - 1.0E+03 6.9E-05
75-69-4 Trichlorofluoromethane 3.8 0.114 - -
95-63-6 Trimethylbenzene, 1,2,4- 11 0.33 - 1.3E+01 5.3E-03
108-67-8 Trimethylbenzene, 1,3,5- 4.1 0.123 - 1.3E+01 2.0E-03
106-42-3 Xylene, P- 36 1.08 - 2.1E+01 1.0E-02
108-38-3 Xylene, m- 36 1.08 - 2.1E+01 1.0E-02
95-47-6 Xylene, o- 13 0.39 - 2.1E+01 3.7E-03
Cumulative: 4.7E-06 6.0E-01
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