HomeMy WebLinkAbout23072_VI Assessment Camelot Cleaners PNC_20120828
August 28, 2012
North Carolina Department of Environment
and Natural Resources
Division of Waste Management – DSCA Program
401 Oberlin Road, Suite 150
Raleigh, NC 27605-1350
Att: Mr. Scott Stupak
DSCA Project Manager
Re: Soil Gas, Sub-Slab Vapor and Indoor Air Sampling Results
Former Camelot Cleaners DSCA Site ID #34-0007
820 S. Main Street
Kernersville, Forsyth County, North Carolina
Dear Mr. Stupak:
URS Corporation – North Carolina (URS) is pleased to provide the results from a soil gas, sub-
slab and indoor air sampling event performed June 13-14, 2012 at the former Camelot Cleaners.
These activities were completed in accordance with the scope of work documented in URS
Assessment Cost Proposal (ACP) submittal, dated March 6, 2012, as approved by DSCA under
State Lead Authorization for Work 006, dated March 12, 2012.
Groundwater contaminant concentrations observed within the plume associated with the site
exceed the applicable vapor intrusion screening levels (VISLs) as documented in the Division of
Waste Management (DMW) Vapor Intrusion Guidance, dated August 2011. Therefore, vapor
intrusion assessment activities were warranted at surrounding structures to evaluate if indoor air
quality has been impacted by vapor intrusion from contaminated groundwater.
To address the potential vapor intrusion to offsite buildings, URS personnel collected 13 soil gas
samples from multiple off-site properties on June 13-14, 2012. It should be noted a sample was
not collected at location SG-8, due to excessive water accumulating in the borehole (potentially
from stormwater runoff from the on-site canopy). Soil gas samples were collected from locations
SG-1 through SG-7 and SG-9 through SG-14. A tracer gas monitoring technique was
incorporated as part of the collection of the subsurface soil gas samples to evaluate if the samples
were isolated from the ambient air during the collection of the samples. The samples were
collected in 6-Liter stainless steel summa canisters over a time period of 30 minutes. The soil gas
sample locations and results are depicted on the figure included in the DSCA Analytical Data
Tables (Appendix A). All samples were collected in accordance with the URS soil gas vapor
sampling protocol (Appendix B).
An indoor air sample, IA-1A, was collected from inside the former Camelot Cleaners facility
(now the Mattress Factory) on June 13, 2012. An indoor air sample, IA-2, and sub slab vapor
sample, SSV-1, were collected on the same date from inside the adjacent tenant, Papa John’s.
The indoor air samples were collected in 6-liter stainless steel summa canisters over a time
Mr. Scott Stupak
Camelot Cleaners - #34-0007
August 28, 2012
Page 2 of 2
period of 8 hours throughout the morning/afternoon. Both indoor air samples were placed on an
elevated surface in order to collect a sample at approximate breathing height. The subslab vapor
sample was collected in 6-liter summa canister over a time period of 30 minutes. The indoor air
and sub slab vapor sample locations and results are also depicted on the figure included in
Appendix A along with tenant and property owner contact information. The samples were
collected in accordance with the URS sampling protocols included in Appendix B.
A copy of the laboratory analytical reports is attached as Appendix C. URS also completed the
DSCA Indoor Air Risk Calculator Worksheets, which are included as Appendix D. The indoor
air results from IA-1A and IA-2 indicated a cumulative risk of 4.39E-07 and 1.57E-07,
respectively. The cumulative hazard index for both indoor air samples was 0.12 and 0.04,
respectively. The Building Survey Forms and Summa Canister Sampling Field Data Sheets
provided by DSCA, were completed and included as Appendix E. Photographs taken from the
sampling event are included as Appendix F.
Weather conditions during the sampling event were sunny with lows in the low-70s and highs in
the mid-90s.
If you have any questions or require additional information please do not hesitate to call either
Rob MacWilliams at 704-522-0330 or Aaron Council at 864-527-4737.
Sincerely,
URS CORPORATION-NORTH CAROLINA
Aaron S. Council Robert H. MacWilliams, PG
Project Manager Program Manager
Enclosures
cc: Project File (hard copy)
APPENDIX A
DSCA ID No.:
Submittal Date:
Analytical Data Tables
for
North Carolina Dry-Cleaning Solvent Cleanup Act Program
Prepared By:
Facility Name:Former Camelot Cleaners
820 South Main Street, Kernersville, NC 27284
URS Corporation - North Carolina
Aaron S. Council, Robert H. MacWilliams, PG
August 28, 2012
34-0007
Table of Contents
DSCA ID No.: 34-0007
Table/
Att. No.
Check box
if included
Table 1 Site Chronology
Table 2 Analytical Data for Soil
Table 3 Analytical Data for Sub-slab Gas
Table 4 Analytical Data for Soil Gas
Table 5 Analytical Data for Indoor and Outdoor Air
Table 6 Monitoring Well Construction Data
Table 7 Groundwater Elevation Data
Table 8 Analytical Data for Groundwater
Table 9 Analytical Data for Surface Water
Table 10 Water Well(s) Survey Data
Table 11 Analytical Data for Water Supply Well(s)
Table 12 Analytical Data for Natural Attenuation Parameters
Att. 1 Site map showing location(s) of soil boring(s).
Att. 2
Att. 3 Soil isoconcentration maps.
Att. 4 Site map showing location(s) of monitoring well(s).
Att. 5
Att. 6 Groundwater gradient map for each sampling event.
Att. 7
Att. 8
Att. 9 Map showing location(s) of surface water sample(s) (if applicable).
Att. 10
Att. 11
Att. 12
Att. 13
Att. 14 Air and soil gas concentration map showing the concentration at each sampling point.
Att. 15
Att. 16
Att. 17
Att. 18
Att. 19
Att. 20
Att. 21
Note:
1. All maps must include a bar scale, north arrow, site name, DSCA ID No., and date.
USGS Quad map with plotted water well location(s) within the 1,500 foot and 0.5
mile radii of the site (if applicable).
Signed laboratory analytical reports including chain-of custody and quality
assurance/quality control (QA/QC) documentation (only if not previously
submitted).
Soil contaminant concentration maps showing the concentration at each sampling
point.
Site map showing location(s) of indoor air, outdoor air, or soil gas samples.
Well completion diagrams and records of construction submitted to state.
PCE concentration map showing the concentration at each sampling point and
isoconcentration map. However, if there are significant plumes for other dry-
cleaning contaminants, contaminant concentration maps for each chemical of
concern should be included.
Surface water concentration map showing the concentration at each sampling
point (if applicable).
Site map showing location(s) of monitoring well(s) for natural attenuation paramete
ADT TOC
Description
Attachments
Tables
Groundwater concentration trend plots.
Table 3: Analytical Data for Sub-slab GasDSCA ID No.: 34-0007Benzenecis-1,2-DichloroethyleneEthylbenzeneMethyl tert-butyl ether(MTBE)NaphthaleneTetrachloroethyleneToluenetrans-1,2-DichloroethyleneTrichloroethyleneVinyl chlorideXylenes (total)Vent Pipe NA NA 0.5h 7/14/10 NA 535 NA NA NA 405 NA <1.2 4.2 <0.77 NASSV-1 8 6 0.5h 6/14/12 NA <0.79 NA NA NA 330 NA <0.79 <1.1 <0.51 NASlab Thickness[inches]Sampling Duration 11 Indicate "G" for grab sample or for longer samples indicate the number of hours followed by "h".Sample IDSampling Date (mm/dd/yy)Depth[inches bgs][mg/m3]ADT 3Page 1 of 2
Table 4: Analytical Data for Soil GasDSCA ID No.: 34-0007Benzenecis-1,2-DichloroethyleneEthylbenzeneMethyl tert-butyl ether(MTBE)NaphthaleneTetrachloroethyleneToluenetrans-1,2-DichloroethyleneTrichloroethyleneVinyl chlorideXylenes (total)SG-1 4 0.5h 6/13/12 NA <240 NA NA NA 270K NA <180 <230 <160 NASG-2 4 0.5h 6/13/12 NA <0.17 NA NA NA 0.41 NA <0.13 <0.17 <0.11 NASG-3 4 0.5h 6/13/12 NA <0.17 NA NA NA 76 NA <0.13 <0.17 <0.11 NASG-4 4 0.5h 6/13/12 NA <0.17 NA NA NA 14 NA <0.13 <0.17 <0.11 NASG-5 4 0.5h 6/13/12 NA <0.17 NA NA NA 130 NA <0.13 <0.17 <0.11 NASG-6 4 0.5h 6/14/12 NA <0.17 NA NA NA 24 NA <0.13 <0.17 <0.11 NASG-7 4 0.5h 6/14/12 NA <0.17 NA NA NA 2.1 NA <0.13 <0.17 <0.11 NASG-9 4 0.5h 6/14/12 NA <0.17 NA NA NA 0.57 NA <0.13 <0.17 <0.11 NASG-10 4 0.5h 6/14/12 NA <0.17 NA NA NA 0.97 NA <0.13 <0.17 <0.11 NASG-11 4 0.5h 6/14/12 NA <0.17 NA NA NA 0.49 NA <0.13 <0.17 <0.11 NASG-12 4 0.5h 6/14/12 NA <0.17 NA NA NA 1.2 NA <0.13 <0.17 <0.11 NASG-13 4 0.5h 6/14/12 NA <0.17 NA NA NA 21 NA <0.13 <0.17 <0.11 NASG-14 4 0.5h 6/14/12 NA <0.17 NA NA NA 5.6 NA <0.13 <0.17 <0.11 NASample Duration 11 Indicate "G" for grab sample or for longer samples indicate the number of hours followed by "h".Sample IDSampling Date (mm/dd/yy)Depth[feet bgs][mg/m3]ADT 4Page 1 of 2
Table 5: Analytical Data for Indoor and Outdoor AirDSCA ID No.: 34-0007Benzenecis-1,2-DichloroethyleneEthylbenzeneMethyl tert-butyl ether(MTBE)NaphthaleneTetrachloroethyleneToluenetrans-1,2-DichloroethyleneTrichloroethyleneVinyl chlorideXylenes (total)Bground 1 07/14/10 F SU 8hNA <0.040 NA NA NA 0.7 NA <0.040 0.0057 <0.013 NAIA-1 07/14/10 C SU 8hNA <0.040 NA NA NA 24 NA <0.040 0.84 <0.013 NAIA-1A 06/13/12 C SU 8hNA 0.012 NA NA NA 19 NA 0.053 0.1 0.0076 NAIA-2 06/13/12 C SU 8hNA 0.011 NA NA NA 6.6 NA 0.011 0.044 0.0072 NANotes:1 Indicate "F" for former or current dry-cleaning facility, "AD" for adjacent space, "R" for residence, "C" for commercial not adjacent space. If sample was taken outdoors, leave blank.2 Indicate "SU" for summa canister, "FC" for flux chambers, "T" for tedlar bags, "P" for passive samplers, "O" for other.Sample Location 1Sampling Duration 3Sampling Method 2Sample IDSampling Date (mm/dd/yy)[mg/m3]ADT 5Page 1 of 8
Table 5(2): Additional Data for Indoor and Outdoor AirDSCA ID No.: 34-0007Attachment:For any indoor air spaces tested, describe the current use of the space (for example - an ABC liquor store adjacent to the dry-cleaner, a residence approximately 200 feet from the dry-cleaner, etc.):Spaces tested include the Mattress Factory, which is located in the former Camelot Cleaner's space and 2) Papa John's is located adjacent to the Mattress Factory. Sampling location map that indicates where all indoor air samples were collected. The map should clearly indicate the names/types of businesses and residence names sampled and in the vicinity of the subject site that may be of concern.The Papa John's, adjancent to the current Mattress Factory, has a HVAC unit located at the rear of the building. Is dry-cleaning facility at the site: Operating Pick-up Only Abandoned If facility is operating, solvents used are: Perc Petroleum Green Earth OtherFor the active or former dry-cleaning space, describe the type and location of the air handling/HVAC unit (for example - a shared unit supplying two adjacent spaces; unit located on the roof):The former dry-cleaning facility, now the Mattress Factory, has a HVAC unit located at the rear of the building. For any other indoor spaces tested, describe the type and location of the air handling/HVAC unit (for example - a shared unit supplying two adjacent spaces; unit located on the roof):ADT 5(2)Page 5 of 8
Table 5(3): Additional Data for Indoor and Outdoor AirDSCA ID No.: 34-0007Sample ID Name and Address for Sampling Location Property Owner Name, Address, and Phone Number Tenant Name, Address, and Phones NumberIA-1A 820 S Main Street, Kernersville, NC 27284JC Faw (Barry Bush), 1830 Winkler Street, Wilkesboro, NC 28697; 336-838-4000The Mattress Factory (Matthew Newman), 820 S. Main Street, Kernersville, NC 27284; 336-499-6602IA-2 822 S Main Street, Kernersville, NC 27284JC Faw (Barry Bush), 1830 Winkler Street, Wilkesboro, NC 28697; 336-838-4000Papa John's, 822 S. Main Street, Kernersville, NC 27284; 336-992-0999ADT 5(3)Page 7 of 8
Papa
John’s
Mattress
Factory
SB 42
1
SOUTH
M
AI
N
OLD WINSTON
SOUTH CHERRY
APPROX. SCALE, ft.
0
SHEET:DRAWN BY:
CHECKED BY:
PROJECT NO.:
URS CORPORATION - NORTH CAROLINA
SOUTHPARK TOWERS
6000 FAIRVIEW ROAD, SUITE 200
TEL: (704) 522-0330
FAX: (704) 522-0063
CHARLOTTE, NC 28210
31828457
AC - 7-10-12
JLW -7-10-12
60
ATT.14Soil Gas, Vapor, and Indoor Air Quality MapCamelot Cleaners820 South Main StreetKernersville, NC
DSCA Site # 34-0007
LEGEND
Below Laboratory Detection LimitsBDL
Estimate ValueJ
Note:
PCE - Tetrachloroethene
TCE - Trichloroethene
cis-1,2 DCE - cis-1,2-Dichloroethene
trans-1,2 DCE - trans-1,2-Dichloroethene
VC - Vinyl Chloride
ug/m3 micrograms per cubic meter
Soil Gas Sample Location
Indoor Air Sample Location
Background Air Sample Location
Subslab (Vent Pipe) Vapor Sample Location
SubslabVapor Sample Location
Not SampledNS
(((())))IAIAIAIAIAIAIAIAIAIAIA-1-1-1-1-11 ((((((((7/7//7/7/7/7/7/7/7/7/7/77 14141411411414141414141414144141141441144/1/1/1/11//1/1/1/1/0)0)0)0)0)0)0)0)00)0)0)0)0)00)0)0)0)00)0)14/10
PCPCPCPCPCPPCPPCCCPCCCPCPPCPPCPCPCPEEE E EE E EE EEEEEE ------2424242424222444 CE - ugugugugugugggugugug/m/m/mm/m/m/m/mm/m/m//m/33333333
TTTTCTCTCTCTCTTCTCTCCTCTTTTCTCTCTCTTTEEEEEEEEE ---0.0.000.0.0.000.0.000..0.0.0...848488848484844848484848484848484848484884444444 uguguguguguuguguguguguuguguguguguguu/m/m/m/m/m/m/m/m/m/m/m/m/m/m/33333333333333
BaBaBaaBBaaaackckckckckkckcckgrgrggrgrgrggouououououuoondndndnddndndn AAAAAAiririrrirrr----1111111 (7((7(77(77(77(77(//1/1//1/111/1/1444/4/4//44/4/44 10101010010101010101010))))))
PCPPCPCPPPCPCPCPPCCEEEEEEEEE ------0.000.00.0.000000000 7070707077077 P ugugugugugugugug/m/m/m/m/m/mmmm/33333
TTCTTTCTCCCTCCCCTTCEEEEEEEEEE 00000000000 00000000000000575775757TTTTTTCTCCCCCCTTTTTE E E EEE EEEE EEE -----0.00.000..000 00000000000057557577 57 uguggggg/m/m/m/m/uguggguguguguguu/m/m/m/m/mmmmug/m3333333
pp (()VVVV tttttt PPii (7(7/1///14/4/1010000000))))))VeVeVeVeeVeVeVVVVntntnntnttnt PPPPPPPPipipipippipeeeeeee (7(7(7(7/1///1//4/4/44/4////101010000)))))))7
PCPPCPCPCPPPCE EEEEEEE EE ----40404044004400555 555 55 uguguguguug/m/m/m/m/mmg/m333
TCTCTCTCTCTTCTEEEE E E EEE ---444.44.4.4..4 22222 22 2 2 TTCTTTCTEE E 44444.2 222TCE - 4.2 ugugugugugugguguuggug//m//m/m/m/m/m/m/m//ugugugugug/m/mug/m333333333
1,1,11,1,1,22-2-22-2-DCDCDCDCDCDCDDCDCE EEEE E E E ---535353533353555 5 555555555 uguguguguguguggg/m/m/m/m/m//m/m/m/mm33333
SG-8 (6/14/12)
NS
SG-7 (6/14/12)
PCE - 2.1 ug/m3
SG-14 (6/14/12)
PCE - 5.6 ug/m3
SG-13 (6/14/12)
PCE - 21 ug/m3
SG-9 (6/14/12)
PCE - 0.57 J ug/m3
SG-12 (6/14/12)
PCE - 1.2 J ug/m3
SG-6 (6/14/12)
PCE - 24 ug/m3
SG-11 (6/14/12)
PCE - 0.49 J ug/m3
SG-10 (6/14/12)
PCE - 0.97 J ug/m3
SG-2 (6/13/12)
PCE - 0.41 J ug/m3
SG-3 (6/13/12)
PCE - 76 ug/m3
SG-4 (6/13/12)
PCE -14 ug/m3
SG-5 (6/13/12)
PCE -130 ug/m3
BaBaBaBaBckckckkckckkkkgggrgrrououououuuundnddndn AAAAAAiririrriririr 111111111 (7(7(7(77(7(77((/1//1/1/////1114/4/4444/4/4/101101000110)))))
SG-1 (6/13/12)
PCE -270,000 ug/m3
IA-2 (6/13/12)
PCE - 6.6 ug/m3
TCE - 0.044 J ug/m3
cis-1,2 DCE - 0.011 J ug/m3
trans-1,2 DCE - 0.011 J ug/m3
VC - 0.0072 J ug/m3
SSV - 1 (6/14/12)
PCE - 330 ug/m3
IA-1A (6/13/12)
PCE - 19 ug/m3
TCE - 0.10 ug/m3
cis-1,2 DCE - 0.012 J ug/m3
trans-1,2 DCE - 0.053 J ug/m3
VC - 0.0076 J ug/m3
Burger
King
PNC
Bank
BP Gas
Station
Wendy’s
Wilco
Hess
APPENDIX B
INDOOR AIR AND AMBIENT AIR SAMPLING
- 1 -
EQUIPMENT REQUIRED
1. Project Health and Safety Plan (HASP)
2. Work Plan
3. 6 Liter Summa Canister with a Flow Regulator from a certified
laboratory (precalibrated for an 8 hour interval)
4. Field forms – URS Building Survey form (Attachment 1), URS
Summa Canister Field Sampling Data Sheet (Attachment 2)
5. ¼” Stainless steel nuts and ferrules
6. 1/4" OD x 1/8" ID Teflon tubing
7. Hand Vacuum Pump
8. Safety Cones
9. Laminated Sign to notify Air Sampling in progress
10. Chain of Custody (COC)
11. FedEx forms
12. Standard wrench set
13. Digital camera
SAMPLING PROTOCOL – INDOOR AIR/AMBIENT AIR
SETUP
9 Select an indoor sampling location in the area of highest
subsurface contamination and/or the location with the most
traffic, if known.
9 If this information is not available, select a sampling location
near the center of the building.
9 The inlet of the sample should be at breathing height (between
3 feet and 5 feet above the floor).
9 If a stand or table is available, place the canister on the stand or
table for sample collection.
9 If necessary, attach a short length of stainless-steel or Teflon
tubing to the summa canister using stainless steel air tight
fittings and anchor the inlet of the tubing so that it is located at
breathing height (e.g., with a zip-tie).
9 Select an ambient air sampling location that is representative
of the heating, ventilation, and air conditioning (HVAC)
system inlet air for the building if an HVAC system is
operating.
Figure 1 – Summa Canister
INDOOR AIR AND AMBIENT AIR SAMPLING
- 2 -
9 If the HVAC inlet is on the side of the building, locate the
summa canister inlet near the HVAC inlet.
9 If the HVAC inlet is on the roof of the building, locate the
summa canister inlet on the roof using the safest method
available.
9 If there is no HVAC inlet, select a monitoring location
immediately upwind of the building. Avoid sampling near
walls, under trees, or other areas with obstructed air flow.
9 Connect the Teflon tubing (if applicable) to the summa canister
using air tight stainless steel fittings.
9 Document the sampling locations using a tape measure.
9 Note the characteristics of the building, including cracks in the
floor, a list of chemicals (including the brand name of the
chemical, the quantity and the location) present in the building
that may affect results, and other pertinent information.
9 Complete the field forms and include as much detail as
possible. A blank building survey form is included in
Attachment 1.
SAMPLING PROTOCOL – SUMMA CANISTER
SAMPLING
9 Check the canister vacuum with a dedicated gauge (i.e., check
all canisters with the same gauge. The vacuum should be
about 28 – 29” Hg. If any canister differs from the others by
3”Hg or more, do not use that canister.
9 Attach the summa canisters and flow controllers to the Teflon
tubing (if applicable) using the stainless steel fittings provided
by the laboratory.
9 Set up both the ambient air and indoor air canisters prior to
opening the canister valves.
9 Place safety cones and “Air Sample in Progress” signs around
the sampling locations as necessary.
9 Open the ambient air or indoor air canister valve and record the
time and vacuum gauge reading (if there is a built-in vacuum
gauge). Complete the Summa Canister Field Data sheet
(Attachment 2).
9 Repeat this process on the other canister as soon as possible.
9 The vacuum should decrease as determined by the flow
controller requested from the laboratory. Typically an 8 hour
flow controller is requested. Record the final times and
vacuums prior to closing the valves.
9 Close the valves at approximately the same time.
Figure 2 – Sampling near HVAC intake
INDOOR AIR AND AMBIENT AIR SAMPLING
- 3 -
9 Label the canisters and fill out the chain of custody.
9 The laboratory will analyze the sample using Method TO-15
SIM (Selected Ion Method). Typically, a list of analytes will
be chosen that is specific to the program.
9 Ship the canister to the laboratory.
9 Clean up and remove all sampling materials from the site.
SUBSLAB VAPOR SAMPLING USING TRACER GAS (HELIUM) TECHNIQUE
- 1 -
EQUIPMENT REQUIRED
1. Project Health and Safety Plan (HASP)
2. Work Plan
3. 6 Liter Summa Canister with a Flow Regulator (precalibrated
for a 30 minute interval) from a certified laboratory – Figure 1
4. Hammer drill with approximately 1-inch diameter by 12-inch
long drill bit and 5/16-inch diameter (minimum) by 18-inch
long drill bit.
5. ¼ inch OD Grade 316 L stainless steel chemically cleaned and
passivated thermocouple cleaned tubing with 0.035 inch
nominal wall thickness
6. Stainless steel unions and plugs (¼” OD Swagelok)
7. Shop Vacuum (shop vac)
8. Hydraulic cement
9. Sculpting (modeling) clay
10. Drillers sand
11. Water
12. Helium Detector
13. Container of helium and regulator
14. One liter tedlar bags
15. Helium leak test device – Figure 2
16. Field forms
17. 1/4" OD x 1/8" ID Teflon tubing
18. 3/8" OD silicone tubing
19. Hand Vacuum Pump
20. Pipe cutter
21. Rub brick
22. Hammer
23. Safety Cones
24. Laminated Sign to notify Sampling in progress
25. Chain of Custody (COC)
26. Shipping documents
Figure 1 – Summa Canister
Figure 2 – Helium leak test device
SUBSLAB VAPOR SAMPLING USING TRACER GAS (HELIUM) TECHNIQUE
- 2 -
SAMPLING PROTOCOL – SUBSLAB VAPOR SETUP
9 Select a sampling location over the area of highest subsurface
contamination, if known. Avoid locations within 2 -3 m of
outside walls. If this information is not available, select a
sampling location near the center of the building slab.
9 If possible, select an area where visible damage to the floor
will be minimized.
9 Prior to drilling holes in a foundation or slab, contact local
utility companies to identify and mark utilities coming into the
building from outside (e.g. gas, water, sewer, refrigerant and
electrical lines)
SAMPLING PROTOCOL – INSTALLATION OF
SAMPLING PROBE
9 Drill into the slab using a rotary hammer drill to create a
“shallow” hole (e.g. 1 inch deep) using a large diameter drill
bit (e.g. 7/8” to 1 ½”).
9 Use a small shop vac to remove cuttings from the hole if
penetration has not occurred.
9 Use the rotary hammer drill to continue drilling in the
“shallow” hole through the slab and slightly into the subslab
material using a minimum 5/16” drill bit.
9 Use the drill bit to measure the thickness of the slab. Record
this value in the field notebook.
9 Once the thickness of the slab is known, select stainless steel
tubing of the desired length. The probe should be at least one
inch shorter than the thickness of the slab to ensure that the
probe “floats” in the slab to avoid obstruction of the probe with
the sub–slab material. See Attachment 1.
9 Construct a sampling probe using the ¼” chromatography
grade, 316 stainless steel tubing and stainless steel
compression fittings (¼” OD Swagelok union). See Figure 3.
9 On the open end of the Swageloc union, attach ¼” new, clean
Teflon or polyethylene tubing.
9 Attach a ¼” nut to the end of the tubing and use a cap or plug
to seal the tubing (sample port). This will prevent air flow in
and out of the sample port while the probe sits idle.
9 Place one inch of driller’s sand into the bottom of the hole
ensuring that the sand is above the bottom of the slab. See
Figure 4.
Figure 3 – Sample Probe
Figure 4 – Sample Port above
grade
SUBSLAB VAPOR SAMPLING USING TRACER GAS (HELIUM) TECHNIQUE
- 3 -
9 Place the open end of the sample probe into the hole so that it
rests on the drillers sand. Ensure the sample port is above
grade.
9 Seal the probe in place using sculpting clay..
SAMPLING PROTOCOL – HELIUM LEAK TESTING
9 Cut the Teflon tubing on the sample port to the desired length
and thread the tubing through the helium leak test device.
9 Attach the hand vacuum pump to the sample port and pump
three times to purge out the system.
9 If the sample location will hold a vacuum of 15” Hg for 5
minutes, the sampling location may not be suitable for
sampling. Check to make sure the hole extends through the
slab. Check to make sure the probe is not plugged with cement
dust from the drilling.
9 Attach the helium detector to the helium leak test device.
Attach the helium container to the leak test device using teflon
tubing and fill the leak test device with helium until the helium
detector reads >50%. See Figure 5.
9 Use the hand pump to fill a 1 Liter tedlar bag with air from the
sample port.
9 Close the tedlar bag and detach it from the pump.
9 Turn off the flow of helium into the helium leak test device.
9 Remove the helium detector from the leak test device and
allow the helium detector reading to reach 0 ppm.
9 Insert the helium detector into the silicon tubing attached to the
tedlar bag and open valve on the bag.
9 Record the reading. If the reading is below 10% of the value
measured within the test device, proceed to the next step. If
the reading is above 10%, repeat the leak test and reconstruct
the sample point as necessary.
o Be sure that the valve to the tedlar bag is open and that
nothing is blocking the flow to the helium detector.
The detector may produce false readings if the detector
pump is strained or if methane is present in the soil gas.
Figure 5 – Leak test device connected to
helium container and helium detector
SUBSLAB VAPOR SAMPLING USING TRACER GAS (HELIUM) TECHNIQUE
- 4 -
SAMPLING PROTOCOL – SUMMA CANISTER
SAMPLING
9 Check the canister vacuum with a dedicated gauge (i.e., check
all canisters with the same gauge. The vacuum should be
about 28 – 29” Hg. If any canister differs from the others by
3”Hg or more, do not use that canister.
9 Attach the canister flow controller to the teflon tubing
connected to the sample port using the stainless steel fittings
provided by the laboratory.
9 Open the canister valve and record the time and vacuum gauge
reading (if there is a built-in vacuum gauge). See Figure 6.
Record the readings in the Summa Canister Field data sheet
(see Attachment 2).
9 Allow the canister vacuum to drop to approximately 2” Hg and
close the canister valve. The canister vacuum should not go to
ambient air conditions (0” Hg). The vacuum should decrease as
determined by the flow controller requested from the
laboratory. Typically a 200 ml/min flow controller is requested
for a 30 minute sample (200 ml times 30 minutes equals a 6L
Summa canister).
9 Record the final time and vacuum prior to closing the valve.
9 Label the canister and fill out the chain of custody. The
laboratory will analyze the sample using Method TO-15.
o Typically, a list of analytes will be chosen that is
specific to the site or program.
9 Ship the canister to the laboratory.
9 Remove the leak test device from the sample port tubing.
9 Remove the probe from the floor using the Teflon tubing or
pliers. .
9 Mix hydraulic cement with water in a gallon plastic bag
following instructions provided with cement product. Cut a
hole in the corner of the bag and squeeze the mixed cement
into the hole (Note: the cement will harden quickly).
9 Use a trowel to smooth the top of the cement. If a level surface
is difficult of achieve, create a bump above the filled hole with
cement.
9 Allow the cement to harden and smooth the surface with the
rub brick. Repair additional flooring as applicable.
Figure 6 – Sample collection with helium
leak test setup
Figure 6 – Sample collection with helium
leak test setup
G:\200\DSCA\vapor point drawing.dwg, 8/6/2007 4:52:06 PM&4#90$;f(+)74'%*'%-'&$;f241,'%601fSLAB GRADE STAINLESS STEELTHREADED CAP;18 - 304
STAINLESS STEELNIPPLE (THREADED)
STAINLESS STEEL
BUSHING -18 - 304CEMENT/QUICKCRETE MIXTURETO HOLD POINTIN PLACE
1" WIDE,2-2.25" TALL"OUTER HOLE"RUBBERGASKET
12 " WIDE,"INNER HOLE"
PORTLAND CEMENTTO SEAL VAPOR POINTFROM AMBIENT AIRABOVE SLAB
STAINLESS STEELTHREADED NIPPLE(LENGTH WILL DEPENDUPON SLAB THICKNESS )
SAND TO PREVENT SOILFROM ENTERING VAPORPOINT RODSOIL GRADE
NOTES: ALL FITTINGS WITH EXCEPTIONS TO THE THREADED CAP WILL BE WRAPPED IN TEFLON TAPE.
NOTE: DRAWING NOT TO SCALE
57$Ä5.#$8#21421+06%4155Ä5'%6+10Ä&5%#241)4#/
SOIL GAS VAPOR SAMPLING
- 1 -
Equipment Needed:
o Project Health and Safety Plan (HASP)
o Work Plan
o 6 Liter Summa Canister with a Flow Regulator from a certified
laboratory (precalibrated for an 0.5 hour interval)
o Field forms –URS Summa Canister Field Sampling Data Sheet
o ¼” Stainless steel nuts and ferrules
o 1/4" OD x 1/8" ID Teflon tubing
o AMS Item # 21010 - Implant 6" for soil gas/air sparging stepped
fitting
o #2A filter sand
o Hydraulic cement
o Measuring tape
o Hand Vacuum Pump
o Helium supply
o Helium detector
o 1L Tedlar bag
o Safety Cones
o Laminated Sign to notify Air Sampling in progress
o Chain of Custody (COC)
o FedEx forms
o Standard wrench set
o Digital camera
AMS Vapor Implants Sampling Method
o Prior to sampling, locate any underground utilities to insure the
safety of subsurface work conditions.
o Use a clean, stainless steel hand auger to auger down to the
desired depth of soil gas vapor sampling beneath the ground
surface. Note: Vapor implant should not be placed in saturated
soils.
o Attach Teflon tubing to the barbed tang of a 6” AMS Vapor Implant
(AMS Item #21010). Make sure that the connection between the
barbed end of the implant and the Teflon tubing is secure.
SOIL GAS VAPOR SAMPLING
- 2 -
o Lower the AMS Vapor Implant and attached tubing into the
borehole until the Implant reaches the desired depth.
o Cut the tubing to the desired length so that you have approximately
2’ of extra tubing to attach to the summa canister.
o Using #2A filter sand, add enough sand to cover the 6” Implant and
2-3” above the Implant. Check the depth of sand using a
measuring tape.
o Add 10-12” of hydraulic cement to the top of the sand to create a
seal. Check the depth of sand using a measuring tape. Wait 30
minutes or until the hydraulic cement has fully hardened.
o Use a hand held vacuum pump to purge the subsurface air through
the Teflon tubing. Purge a minimum of one pore volume of the
borehole.
o Thread the tubing through the helium leak test device (helium
chamber).
o Attach the helium detector to the helium leak test device. Attach
the helium container to the leak test device using teflon tubing and
fill the leak test device with helium until the helium detector reads
>50%.
o Use the hand pump to fill a 1 Liter tedlar bag with air from the
sample port.
o Close the tedlar bag and detach it from the pump.
o Turn off the flow of helium into the helium leak test device.
o Remove the helium detector from the leak test device and allow the
helium detector reading to reach 0 ppm.
o Insert the helium detector into the silicon tubing attached to the
tedlar bag and open valve on the bag.
o Record the reading. If the reading is below 10% of the value
measured within the test device, proceed to the next step. If the
reading is above 10%, repeat the leak test and reconstruct the
sample point as necessary.
SOIL GAS VAPOR SAMPLING
- 3 -
o Be sure that the valve to the tedlar bag is open and that nothing is
blocking the flow to the helium detector. The detector may produce
false readings if the detector pump is strained or if methane is
present in the soil gas.
o After the helium test has been satisfactorily completed and soil gas
vapor sampler is purged, connect the stainless steel summa
canister to the Teflon tubing using air tight stainless steel fittings.
Utilize the laboratory supplied flow controller to pull the sample over
the desired time interval.
o To remove the stainless steel Implant, break up the hydraulic
cement seal. Tug gently on the Teflon tubing until the Implant is
freed.
o Remove the Teflon tubing from the barb and dispose of the tubing
and the disposable stainless steel Implant.
o Backfill borehole.
APPENDIX C
July 03, 2012
LIMS USE: FR - AARON COUNCIL
LIMS OBJECT ID: 92121787
92121787
Project:
Pace Project No.:
RE:
Mr. Aaron Council
URS
PO Box 203970
Austin, TX 78720
CAMELOT CLEANERS
Dear Mr. Council:
Enclosed are the analytical results for sample(s) received by the laboratory on June 19, 2012. The
results relate only to the samples included in this report. Results reported herein conform to the
most current TNI standards and the laboratory's Quality Assurance Manual, where applicable, unless
otherwise noted in the body of the report.
Analyses were performed at the Pace Analytical Services location indicated on the sample analyte
page for analysis unless otherwise footnoted.
Some analyses have been subcontracted outside of the Pace Network. The subcontracted
laboratory report has been attached.
If you have any questions concerning this report, please feel free to contact me.
Sincerely,
Kevin Godwin for
Kevin Herring
kevin.herring@pacelabs.com
Project Manager
Enclosures
cc:URS, URS
REPORT OF LABORATORY ANALYSIS
This report shall not be reproduced, except in full,
without the written consent of Pace Analytical Services, Inc..
Page 1 of 1
Pace Analytical Services, Inc.
9800 Kincey Ave. Suite 100
Huntersville, NC 28078
(704)875-9092
Pace Analytical Services, Inc.
2225 Riverside Dr.
Asheville, NC 28804
(828)254-7176
Pace Analytical Services, Inc.
205 East Meadow Road - Suite A
Eden, NC 27288
(336)623-8921
APPENDIX D
DSCA ID No: Name/Address of DSCA Site:Name/Address of Sampling Location:6/13/2012Sample ID:IA‐1ATetrachloroethyleneTrichloroethyleneVinyl ChlorideBenzeneEthylbenzeneNaphthaleneMTBE1,2‐Dichloroethane19 0.10.007647.2 3.0 2.81.6 4.9 0.36 47 0.470.40 0.03 0.00 0.00 0.00 0.00 0.00 0.00TetrachloroethyleneTrichloroethyleneVinyl Chloridetrans - 1,2 -DCEBenzeneTolueneEthylbenzeneTotal XylenesNaphthaleneMTBE1,2‐Dichloroethane19 0.1 0.0076 0.053175 8.8 440 260130 22000 4400 440 13 13000 310.1086 0.0114 0.0000 0.0002 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000Notes:1. RSLs available at: http://www.epa.gov/reg3hwmd/risk/human/rb-concentration_table/Generic_Tables/index.htm2. Trans-1,2-DCE, toluene and xylenes were not included in the cumulative risk calculation since they currently have no carcinogenic EPA RSLs.3. Cis-1,2-DCE was not included in cumulative risk or HI calculation since there are currently no EPA RSLs.4. Note that EPA RSL for PCE was recalculated by the DSCA Program based on the 2/10/2012 toxicity data issued under IRIS.DSCA Indoor Air Risk Calculator - Table 2: Cumulative Risk for Industrial WorkerRatio = Max Concentration ÷ EPA RSLCUMULATIVE RISK (sum of ratios x 10-6)4.39E-0734-0007Cumulative Risk Calculation for Indoor Air Pathway (Industrial)Maximum Concentration Detected (µg/m3)EPA Regional Screening Level (RSL) for Industrial Air (carcinogenic target risk = 1E-06) µg/m3Sampling Date:Former Camelot Cleaners, 820 South Main Street, Kernersville, NC 27284Mattress Factory, 820 South Main Street, Kernersville, NC 27284Ratio = Max Concentration ÷ EPA RSLCUMULATIVE HI (sum of ratios) 0.12Cumulative Hazard Index (HI) Calculation for Indoor Air Pathway (Industrial)Maximum Concentration Detected EPA Regional Screening Level (RSL) for Industrial Air [noncancer Hazard Index (HI)=1] µg/m3DSCA Cumulative Risk Calculator v8 ‐ 2‐16‐12
DSCA ID No: Name/Address of DSCA Site:Name/Address of Sampling Location:6/13/2012Sample ID:IA‐2TetrachloroethyleneTrichloroethyleneVinyl ChlorideBenzeneEthylbenzeneNaphthaleneMTBE1,2‐Dichloroethane6.6 0.0440.007247.2 3.0 2.81.6 4.9 0.36 47 0.470.14 0.01 0.00 0.00 0.00 0.00 0.00 0.00TetrachloroethyleneTrichloroethyleneVinyl Chloridetrans - 1,2 -DCEBenzeneTolueneEthylbenzeneTotal XylenesNaphthaleneMTBE1,2‐Dichloroethane6.6 0.044 0.0072 0.011175 8.8 440 260130 22000 4400 440 13 13000 310.0377 0.0050 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000Notes:1. RSLs available at: http://www.epa.gov/reg3hwmd/risk/human/rb-concentration_table/Generic_Tables/index.htm2. Trans-1,2-DCE, toluene and xylenes were not included in the cumulative risk calculation since they currently have no carcinogenic EPA RSLs.3. Cis-1,2-DCE was not included in cumulative risk or HI calculation since there are currently no EPA RSLs.4. Note that EPA RSL for PCE was recalculated by the DSCA Program based on the 2/10/2012 toxicity data issued under IRIS.Ratio = Max Concentration ÷ EPA RSLCUMULATIVE HI (sum of ratios) 0.04Cumulative Hazard Index (HI) Calculation for Indoor Air Pathway (Industrial)Maximum Concentration Detected EPA Regional Screening Level (RSL) for Industrial Air [noncancer Hazard Index (HI)=1] µg/m3DSCA Indoor Air Risk Calculator - Table 2: Cumulative Risk for Industrial WorkerRatio = Max Concentration ÷ EPA RSLCUMULATIVE RISK (sum of ratios x 10-6)1.57E-0734-0007Cumulative Risk Calculation for Indoor Air Pathway (Industrial)Maximum Concentration Detected (µg/m3)EPA Regional Screening Level (RSL) for Industrial Air (carcinogenic target risk = 1E-06) µg/m3Sampling Date:Former Camelot Cleaners, 820 South Main Street, Kernersville, NC 27284Papa John's, 820 South Main Street, Kernersville, NC 27284DSCA Cumulative Risk Calculator v8 ‐ 2‐16‐12
APPENDIX E
APPENDIX F
PHOTOGRAPHIC LOG
Site Name:
Camelot Cleaners
Site Location:
820 S. Main Street, Kernersville, NC
DSCA Site No.
34-0007
Photo No.
1 Date:
06/13/12
Direction Photo Taken:
North
Description:
View of URS personnel
preparing soil gas
sample location SG-1 on
Sallie Greenfield’s
property located north
and adjacent to the
former Camelot
Cleaners.
Photo No.
2
Date:
6/14/12
Direction Photo
Taken:
East
Description:
View of soil gas sample
location SG-6 located
outside the Wendy’s
restaurant located
southwest of the former
Camelot Cleaners.
PHOTOGRAPHIC LOG
Site Name:
Camelot Cleaners
Site Location:
820 S. Main Street, Kernersville, NC
DSCA Site No.
34-0007
Photo No.
3 Date:
6/14/12
Direction Photo Taken:
Southwest
Description:
URS personnel using
concrete boring machine
to access subsurface for
soil gas sample location
SG-8 at the BP Gas
Station located
southwest of the former
Camelot Cleaners.
Photo No.
4
Date:
6/13/12
Direction Photo
Taken:
NA
Description:
Soil gas sample
location SG-4 located
on Sallie Greenfield’s
property, located north
and adjacent to the
former Camelot
Cleaners.
PHOTOGRAPHIC LOG
Site Name:
Camelot Cleaners
Site Location:
820 S. Main Street, Kernersville, NC
DSCA Site No.
34-0007
Photo No.
5 Date:
6/13/12
Direction Photo Taken:
NA
Description:
View of soil gas sample
location SG-3 and the
materials used to
construct the boring
location.
Photo No.
6
Date:
6/14/12
Direction Photo
Taken:
NA
Description:
View of soil gas sample
location SG-11 located
at the Wilco Hess
station located west
and across Old Winston
Road from the former
Camelot Cleaners.