19025_AMI_VIAWP_20211004

ICE.
REVISED INDOOR AIR
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SAMPLING WORK PLAN
FORMER AMERICAN MULTIMEDIA SITE
BROWNFIELDS PROJECT # 19025-015-001
2609 TUCKER STREET EXTENSION
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fir` BURLINGTON ALAMANCE COUNTY
NORTH CAROLINA
y OCTOBER 4, 2021
' MSE JOB NO. 849
Prepared For:
MR. MILT PETTY
CAROLINA HOSIERY MILLS INC.
710 KOURY DRIVE
BURLINGTON, NORTH CAROLINA, 27215
` MINERAL SPRINGS ENVIRONMENTAL, P.C.
-- '?L- 4600 MINERAL SPRINGS LANE
RALEIGH, NORTH CAROLINA, 27616
919.261.8186
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MINERAL
SPRINGS
environmental, p.c. 4600 Mineral Springs lane Raleigh, NC 27616
October 4, 2021
Ms. Sharon Poissant Eckard, P.G.
Eastern District Supervisor
North Carolina Department of Environmental Quality
Brownfields Program
1646 Mail Service Center
Raleigh, North Carolina 27699-1646
Subject: Revised Indoor Air Sampling Workplan
Former American Media International Site
Burlington, North Carolina
Brownfield Project # 19025-015-001
MSB Job 849
Dear Ms. Eckard:
919-261-8186
Mineral Springs Environmental (MSE) has prepared the following workplan for your review. The
workplan details the methods to be used to perform Indoor Air Sampling within certain portions of
the building.
If you have any questions, please contact me at [phone].
Sincerely,
t C A hY
rM'0E6jA*o ntal PC
i 2-
Kirk Pokard L.G. .?
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Senior. �4�

REVISED INDOOR AIR SAMPLING WORKPLAN
FORMER AMERICAN MEDIA INTERNATIONAL SITE
2609 Tucker Street Extension
Burlington, Alamance County, North Carolina
Brownfields Project # 19025-015-001
October 4, 2021
Prepared by:
Kirk B. Pollard
NC Licensed Geologist # 1323
Mineral Springs Environmental PC # C-357
4600 Mineral Springs Lane
Raleigh, ,Q,QWAkk
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Contact Information:
Developer: Carolina Hosiery Mills Inc — Milt Petty, Ernie Koury
Environmental Consultant: Mineral Springs Environmental PC — Kirk Pollard
Brownfields Program Project Manager — Sharon Eckard

TABLE OF CONTENTS
1 INTRODUCTION 2
2 INDOOR AIR SAMPLING PROGRAM 4
3 INDOOR AIR SAMPLING REPORT 5
4 SCHEDULE 5
5 SITE HEALTH AND SAFETY 6
DRAWINGS
Drawing 1 Topographic Site Map
Drawing 2 Site Map
TABLES
Table 1 Property Summary
Table 2 Summary of Indoor and Outside Air Quality Data Gaps
Appendices
Appendix A Guidance Checklist
Appendix B Indoor Air Analysis Documentation

REVISED INDOOR AIR SAMPLING WORKPLAN
FORMER AMERICAN MEDIA INTERNATIONAL SITE
2609 Tucker Street Extension
Burlington, Alamance County, North Carolina
Brownfields Project # 19025-015-001
October 4, 2021
1 INTRODUCTION
1.1 Site Information
The subject site is the former American Media International (AMI) facility located at 2609
Tucker Street Extension in Burlington, North Carolina (see Drawing 1). On March 4, 2015, on
behalf of Carolina Hosiery Mills Inc., Mineral Springs Environmental P.C. (MSE) submitted a
North Carolina Brownfields Application for the site. A letter of eligibility was issued for entry into
the North Carolina Brownfields Program on May 27, 2015. The site currently has one open
environmental incident according to North Carolina Department of Environmental Quality,
Division of Waste Management Inactive Sites Section files.
• Incident # NONCD0001259 has been assigned by the Inactive Sites Section due to a
release of tetrachloroethene and trichloroethene in the 1980s. Significant investigation
activities have been ongoing since the 1990s.
In 1992, a Phase I Environmental Site Audit (ESA) was performed at the site by Trigon
Engineering Consultants, Inc (Trigon). The audit indicated that stained soils were present in and
around an empty drum storage area, the chemical storage building, former compressor area
and near the heating and air conditioning equipment. These areas are located on the western
side of the building. Subsequently, Trigon conducted a Phase II ESA which consisted of
collecting soil samples adjacent to the above mentioned areas. Tetrachloroethene and other
chlorinated solvents were detected at concentrations in excess of the North Carolina Cleanup
Standards. Additional soil and groundwater investigation activities were performed by
Environmental Investigations (EI) in 1999. The results revealed the bulk of the groundwater
impact is to the west of the building. In 2002 EI installed an air sparge and soil vapor extraction
groundwater remediation system at the site. The system operated short time and was cut-off
due to large quantities of groundwater entering the system. Numerous assessments have been
performed at the site. The assessment activities have been documented in reports and
submitted to the appropriate state agency. The work tasks have involved the sampling and
closure of drinking water wells and the evaluation of soil vapor intrusion at various residences in
the area.
Table 1 summarizes the ownership history and operations performed at the site. Historical
operations performed at the site consisted of casket manufacturing by Heritage Caskets from
1984 to 1992. Of note the chlorinated solvents identified in 1992 were attributed to the casket
operation. American Multimedia International occupied the site from 1992 until 2013 and
manufactured compact disk, cassette tapes and DVDs. The site remained vacant from 2013 to
2015. Since 2015 the site has been used for the storage of textile products by Carolina Hosiery
Mills Inc. Current the owner has no plans for building expansion and will continue to use the
building for storage purposes and office space.
MINERAL SPRINGS ENVIRONMENTAL PC
Revised Indoor Air Sampling Workplan October 4, 2021
Former AMI Site Page 2

The subject site is comprised of two parcels of land totaling 17.63 acres. One parcel is
approximately 7.15 acres and is occupied with an approximately 123,000 square foot building and
a small wooden structure located to the west of the building. The large building is currently being
used for the storage of yarn products. A large portion of the building is not being used. A section
of the building to the east is comprised of office space with carpeted and tile flooring and sheet
rock walls. Drop down tiles are located in the office area. The remainder of the building exhibits
concrete floor and concrete walls or metal siding. In some areas of the warehouse vinyl tile floors
are present. Two electric freight elevators are present in the building. The exterior of the building
is comprised of glass, concrete and metal siding. The building is surrounded by an asphalt parking
lot with minor landscaped areas. Several transformers and air conditioning/heating units are
located adjacent to the building. Metal plates and lids were identified in the parking lot to the rear
of the building. These items appear to be associated with ongoing assessment activities and a
former remediation system. The small building also located to the rear of the building was locked
at the time of the site visit. However, some items such as a fork lift were observed in the building.
The building appears to be connected to the city water and sewer system. The second parcel of
land totals approximately 10.5 acres and is primarily fallowed. A building with tanks is located on
this property and most likely contains remediation equipment. Piping from the remediation system
is most likely under ground. Several monitoring wells are also located on the property.
1.2 Indoor Air and Groundwater Sampling Programs
On April 1, 2016 MSE collected 10 indoor air quality samples (IA-1 thru IA-10) to determine if
concentrations of volatile organic compounds were present in the building. Indoor air samples
were collected in accordance with procedures provided in the most recent version of the North
Carolina Division of Waste Management Vapor Intrusion Guidance document. The samples were
collected in various areas of the building to obtain a thorough representation of the air quality
inside the building. The sample locations are shown on Drawing 2.
None of the 10 indoor air samples indicated the presence of compounds at concentrations
above the IHSB Screening Values. Chloroform, chloromethane dichlorodifluoromethane and
trichlorofluoromethane were detected and are associated with refrigerants and also found as a
part of the byproducts of the chlorination of drinking water was also detected at concentrations
above their respective IHSB Screening Values in Sample 3. Tetrachloroethene (PCE) was
detected in sample location IA-1 at a concentration well below IHSB Screening Values. Several
other compounds including 2 propanol, 2-butanone, actenone were also detected but at
concentrations below the IHSB Screening Values.
On April 1, 2016 steps were also taken to collect groundwater samplings from six onsite
monitoring wells. The six wells sampled were monitoring wells, MW-1, MW-7, MW-8, MW-9,
MW-10 and MW-13 (see Drawing 2). The collected samples will then be transported to ENCO
located in Cary, North Carolina for analysis of volatile organic compounds according to EPA SW-
846 Method 8260. The groundwater sample obtained from monitoring well MW-7 did not
contain compounds above the laboratory practical quantitation limit (LPQL). Several chlorinated
compounds were detected in the groundwater samples obtained from monitoring wells MW-1,
MW-8, MW-9, MW-10 and MW-13 at concentrations above the North Carolina Groundwater
Quality Standard (NCGWQS). The primary compounds detected were PCE, trichloroethene
(TCE) and cis 1,2 dichloroethene (cis 1,2 DCE). PCE was detected at concentrations ranging
from a low of 16 micrograms per liter (ug/1) in monitoring well MW-8 to a high of 21,000ug/l in
monitoring well MW-13. TCE was detected at concentrations ranging from a low of 3.6ug/I in
MINERAL SPRINGS ENVIRONMENTAL PC
Revised Indoor Air Sampling Workplan October 4, 2021
Former AMI Site Page 3

monitoring well MW-8 to a high of 2,100ug/I in monitoring well MW-10. Cis 1,2 DCE was
detected at concentrations ranging from a low of 3.1 ug/I in monitoring well MW-8 to a high of
730ug/I in monitoring well MW-1. Vinyl chloride was detected in one monitoring well MW-1 at a
concentration of 180ug/I which is above the NCGWQS. Based on a thorough review of
previously prepared documents mercury impact has not been assessed in the soil or
groundwater. Based on the operations previously performed at the site, mercury vapor intrusion
does not appear to be a concern.
A second indoor air sampling program was requested by Sharon Eckard with the North Carolina
Brownfields Program on September 14, 2021 during a site visit. Please find a Revised Indoor Air
Sampling Work Plan to perform the associated scope of work.
2.0 INDOOR AIR SAMPLING PROGRAM
2.1 Purpose
Mineral Springs Environmental PC (MSE) was contracted to perform an indoor air assessment of
the potential for solvent vapors to be present in the building. This assessment will consist of
collecting air samples for laboratory analysis at various locations within the building using
summa canisters. Table 2 summarizes the sampling program to obtain additional indoor air
analysis.
2.2 Scope of Work
The scope of work is based on a site visit conducted between Sharon Eckard with the North
Carolina Brownfields Program and representatives for the owners of the AMI facility on
September 14, 2021. MSE will collect up to 11 indoor air quality samples to determine if
concentrations of volatile organic compounds are present in the building. In addition to the
above, an ambient background air sample will be collected outside and on the property. The
canister will be placed in an area upwind of the facility. The sample will be analyzed for volatile
organic compounds (VOCs) according to EPA TO-15. The proposed sampling locations are
shown on Drawing 2. Indoor air samples will be collected in accordance with procedures
provided in the most recent version of the North Carolina Department of Environmental Quality
(NCDEQ) Brownfields Program Vapor Intrusion Guidance document dated July 2021. Appendix
A contains a copy of the completed checklist associated with the guidance document. The
samples will be collected in various areas of the building to obtain a thorough representation of
the air quality inside the building. Prior to placing the canisters, a thorough inspection will be
performed of the interior of the building. The inspection will involve looking for cracks in the
floor and building walls. In addition, the inspection will look for floor drains, elevator shafts or
other areas where vapors could enter, and will include the identification and removal of any
products found in the building that contain the compounds or contaminants previously detected
in the site groundwater. Any identified compounds will be removed within 24 to 72 hours and
typically within 48 hours before sampling activities commence. The inspection will determine the
locations of the canisters. The preliminary sample locations are shown on Drawing 2.
Air Sampling Activities
Six liter individually certified, by the laboratory, summa canisters will be used to collect the
samples and will be deployed for a period of eight hours with regulators pre-set at the
MINERAL SPRINGS ENVIRONMENTAL PC
Revised Indoor Air Sampling Workplan October 4, 2021
Former AMI Site Page 4

laboratory. Prior to setting the canister for sampling, each sampling gauge will be checked to
assure the summa canister is issued with the maximum achievable pressure of 30 inches of
mercury. The target final vacuum reading of at least -5 inches of mercury will be used for
sample canister retrieval. All pre and post sampling measurements will be recorded. The run
time of eight hours represents an eight hour work day. Based on the groundwater analytical
reported in April 2016, four primary chlorinated solvents (PCE, TCE, 1,2 DCE and Vinyl Chloride)
were detected, the samples will be analyzed for VOCs according to EPA TO-15. All results will be
reported in micrograms per cubic meter and at the lowest possible detection limit. Each canister
will be set at a height of approximately five feet above the concrete floor of the building. Using
a duplicate manifold sampling connection and a single fill port, three duplicate samples will be
collected during the eight hour period and also analyzed for VOCs according to EPA TO 15. Two
duplicates will be collected in the warehouse area of the building and one will be collected in
the office area. As stated above, on ambient outside are sample will be collected in an upwind
location. During the testing all windows and doors will remain shut. Limited access will be
required to place and retrieve the canisters. Pictures will also be obtained to document the
locations of the canisters. During the sample collection activities periodic temperature and
pressure gauge readings will be obtained within the building and outside the facility. Overall
weather conditions will also be documented. The building conditions, including HVAC conditions,
will remain the same within 24 hours prior to and during the sampling.
Laboratory Analysis
Once the summa canisters have been retrieved, each canister will be shipped using an
overnight carrier following strict chain -of custody procedures. All canister readings, canister and
regulator identification numbers, sampling times will be recorded on the field log sheet and/or
chain -of -custody. The samples will be analyzed for volatile organic compounds according to EPA
TO-15 by Eurofins Air Toxics, LLC located in Folsom, California. The Eurofins Air Toxics
compound list, including naphthalene is contained in Appendix B. Also included is Eurofins QA
Method Summary for EPA TO-15 Low level analysis. The laboratory report will include estimated
compound values (J values). Eurofins uses Level II QA/QC. Based on a thorough review of
previously prepared documents mercury impact has not been assessed in the soil or
groundwater. Based on the operations previously performed at the site, mercury vapor intrusion
does not appear to be a concern. Based on a review of the Eurofins compound list, acrolein will
not be analyzed.
3 INDOOR AIR SAMPLING REPORT
A North Carolina Licensed Geologist will prepare and submit a signed and sealed Indoor Air
Sampling Report to the Brownfields Program. The report will provide a discussion of the indoor
air sampling procedures and analytical results. The report will provide a discussion of the
analytical results and compare the results to the North Carolina Brownfields Program June 2021
Non -Residential Indoor Air Vapor Intrusion Screening Levels. The analytical results will also be
evaluated using the DWM June 2021 Risk Calculator.
4 SCHEDULE
Once the workplan has been reviewed and approved by the Brownfields Program, work tasks
will commence. The overall field activities and analysis of samples will take approximately two
MINERAL SPRINGS ENVIRONMENTAL PC
Revised Indoor Air Sampling Workplan October 4, 2021
Former AMI Site Page 5

weeks to complete. The report will take approximately one day to complete once all the data
has been received. In addition, a Brownfields Receptor Survey will also be performed as part of
the Brownfields Assessment for a Brownfields Agreement.
5 SITE HEALTH AND SAFETY
A site -specific health and safety plan (HASP) will be prepared by MSE personnel to be utilized by
MSE personnel. Subcontractors working within the exclusion area will either prepare their own
equivalent HASP or follow the MSE plan. Site workers will have received OSHA 40-hour training as
specified in Title 29 CFR 1910.120 with eight -hour refresher training within the last year.
MINERAL SPRINGS ENVIRONMENTAL PC
Revised Indoor Air Sampling Workplan October 4, 2021
Former AMI Site Page 6

DRAWINGS
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APPENDICES
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APPENDIX A
GUIDANCE CHECKLIST

Title Page
The title page should include the following information.
1 Title of work plan or report
® Brownfields Project Name (not the development name)
lU Brownfields Project Number
C6 Date (updated with each revision)
16 Revision Number
A Firm PE/PG License Number
1� Individual PE/PG seal & signature
Z Contact information for Developer, Consultant, and Project Manager (or BPMU Staff)
Section 1— Introduction
Provide a BRIEF summary of the history of the property that contains the following:
ZHistory in the Brownfields Program or involvement by another DEQ Section such as
DSCA
V Provide a chronology of former and/or current uses
14 List potential sources of vapor intrusion (e.g. off -site migration of contaminants, on -site
releases, chlorinated solvent use, especially the presence or suspected presence of
trichloroethylene (TCE), groundwater contamination, and preferential pathways such as
ut lity corridors
List RECs from a Phase I ESA and their location on the Brownfields Property
❑ Provide a conceptual site model for the Brownfields Property on which to base the data
gap evaluation
Z Indicate if the scope of work was negotiated during a Brownfields Data Gap Meeting, etc,
Provide a summary of the redevelopment plans for the Brownfields Property that contains the
following:
9 Type of proposed use (townhomes, apartments, mixed -use, retail, etc.)
❑ Demolition, new construction and foundation type
[�Re-use of existing structures
4Presence of elevators & stairwells
❑ How the new building configuration/parking areas relate to the location, if known, of
contamination at the Brownfields Property
M Proposed and existing building/unit square footage to be assessed.
If Indicate that the proposed use has been approved or is under evaluation by the
Brownfields Program at the time of submittal.
❑ Include a discussion of the following and reference each appendix or attachment where
located:
KJ Figure 1 - Site location map on USGS topographic map, north arrow,
graphic scale, site outline
❑ Figure 2 — see format requirements in Section 8 below - Site redevelopment
plans superimposed on a high -duality aerial photograph of the site
VIMS Assessment Checklist Version 1, July 2021

® Table I — see example Tables in ,Section 8 below: With property identifying
information in a summary table format: Brownfield Project Number, Parcel
Number(s), address, site acreage, former or current use, & proposed use
Section 2;-- Sco a of Work
Provide a general description of proposed scope of work covered in this plan (e,g., S
soil gas sampling points, 6 sub -slab points, 4 indoor air, 1 ambient air); Note for any
Brownfields Property, baseline data for each applicable environmental medium as
determined by DEQ is required.
YDiscuss samples to be collected by media and source area/location. Generally, the
r soning for the sample locations selected.
Include a discussion of the following and reference each appendix or attachment
where located:
iTable 2 — see example Tables in Section 8 below - Briefly list and describe
the vapor intrusion data gaps the assessment is attempting to fill and note other
pertinent information in a sampling summary, including background and
QA/QC sain es.
U11 FigureA — see format requirements in Section 8 below - Proposed Sample
Location Map - Provide a figure in the work plan noting the location of each of
the proposed soil gas, sub -slab, or indoor air samples overlain with planned
building layouts, historical areas of concern, and previously identified impacts.
Note that DEQ DWM VI Guidance states that "Due to spatial variability in sub -slab soil gas
concentrations over a slab, DWM generally recommends the collection of one sample per 1,000
square feet of first floor building area." Sampling density could vary due to site -specific
considerations, and with prior approval from DEQ.
Section 3 — Sampling Metlhodolo
For all air sampling planned, provide the following information in relevant section 3.a or 3.b
discussed below:
Reference the most current versions of DEQ DWM and ITRC guidance documents
applicable to vapor intrusion sampling, and any other applicable standard operating
procedures. Note any deviations or methodology planned that is not covered by such
guidance.
P�Discuss timing of sampling and whether indoor air and sub -slab sampling will be
occurring contemporaneously; if so plan to conduct indoor air sampling first so that the
creation of the sub -slab point does not influence the indoor air data.
Atate the analytes for which each sample will be analyzed for (briefly) and include the
Vlytes that are specifically being requested for reporting. Reference Table 2,
Indicate if mercury has previously been assessed for/detected in soil or groundwater
ano whether mercury vapor intrusion concerns are present.
Discuss how and when vacuum readings will be collected (for Summa canisters) —
field vacuum readings should be recorded on the chain of custody forms for ease in
comparing to reported laboratory receipt vacuum readings.
VIMS Assessment Checklist Version 1, July 2021

Dote: Per DEQ DWM VI Guidance, Summa canisters that have lost greater than 10% of the
initial recorded lab vacuum when received in the field will not be used for sampling. It is
assumed that Summa canisters are issued with a maximum achievable pressure of 30" Hg. If
canisters are received in the field with less than 27" Hg, initial lab pressure measurements should
be documented to confirm less than a 10% volume loss or a replacement summa canister
obtained. Otherwise, sample results may be rejected.
YProvide the sample collection time duration for all samples.
54tate how duplicate sample(s) will be collected.
Andicate a targeted final vacuum reading of at least -5" Hg. Note if the vacuum
measurement is less than this, sample acceptance will be in jeopardy and DEQ
Brownfields may request a resample.
Include planned flow rate for Summa canister sampling or time allotting for passive
samplers.
Note: Per DEQ DWM VI Guidance, the maximum allowable flow rate is 200 mL/min.
Section 3.a. Exterior Soil gas / Sub -Slab Sampling
❑ Describe depths of samples to be collected (Reference example Table 2 in Section S
below) or how that decision will be made in the field, if needed. Refer to DEQ DWM
Vapor Intrusion Guidance for reference to minimum depths of samples.
❑ Locate sub -slab samples in areas of the slab that are near known or potential sources of
volatile contaminants and in areas that could encourage vapor migration, such as sub -
grade trenches, pits, and elevator shafts, but position them at least 5 feet from exterior
walls or cracks/penetrations.
❑ Locate sub -slab samples across the building(s) being assessed being mindful of any
building features that could indicate the presence of sub -walls or footers that would
restrict sub -slab vapor flow.
❑ Describe installation methodology construction details of the sub -slab and/or soil
vapor samples, including filter pack and sealants. Use of new and dedicated tubing is
required.
❑ Discuss sample collection procedures. Include the following, at a minimum:
❑ Equipment to be used (Summa canisters & size, type of tubing, vapor pins,
etc.)
❑ Indicate if sub-slab/exterior soil gas sample points will be permanent or
temporary.
❑ Whether Summa canisters are batch- or individually -certified.
❑ Discuss stabilization time of the sampling points prior to sampling.
Note: Inadequate stabilization times have been known to impact sample results through the
inadvertent collection of vapors off -gassing from soil gas/sub slab installation materials,
potentially creating false positive results that would then require a resampling event,
Recommended stabilization times are outlined below:
VIMS Assessment Checklist Version 1, July 2021

a, Sub -slab with minimally invasive points (e.g. Vapor Pins): Manufacturer's
guidelines generally suggest 20 minutes may be sufficient with an airtight cap
installed;
b. Sub -slab points (other than minimally invasive points): at least 24-48 hours
(to be purged at installation and at time of sampling with an air -tight cap in
place in the interim); or
c. Exterior soil gas points: 48 hours to allow materials used during installation
to off -gas prior to sampling (to be purged at installation and at time of sampling
with an air -tight cap in place in the interim).
❑ Describe purging methods and volumes — must take into account not only the volume
of the tubing but also of the annulus. Stagnant air inside soil gas probes and sampling
trains must be purged prior to sample collection. Three to four system purge volumes are
recommended as a minimum value. The investigator should use a low purge rate with a
maximum of 200 mL/min.
❑ Describe leak check procedures for sub -slab and soil gas samples. Note: helium check
of entire sample train is required; a shut-in test is also recommended as a best
management practice.
❑ Describe how the helium meter will be connected to the sampling train. Note that
directly connecting the helium meter to the sampling train without a backflow preventer
is not allowed.
❑ Record the type of material found under the slab or in the soil gas borings.
❑ Record stab thickness for sub -slab samples and provide soil boring logs for soil gas
samples.
❑ Discuss sample point abandonment and/or securement (if permanent points)
Note: Exterior soil -gas sampling may not necessarily be indicative of site conditions following
redevelopment efforts and confirmation sub -slab sampling may be necessary following
construction to confirm that a potential vapor intrusion pathway is not present,
Section 3.b. Indoor Air / Crawl Space Sampling
Zinclude a chemical survey of any potential interference compounds stored or used
inside the building (Refer to example Indoor Air Building Survey and Sampling Form
that will be completed for each distinct area of the Brownfields Property under
assessment. The Indoor Air Form is included within the DEQ DWM VI Guidance).
CdDescribe steps to remove any potential interference compounds from the sampling
area sufficiently ahead of the sampling event (The DEQ DWM VI Guidance recommends
removal within 24-72 hours and typically within 48 hours of sampling as indicated on the
Indoor Air Building Survey and Sampling Form).
Pf Schedule sampling to minimize any potential for interference from compounds used
during construction or finishing of new buildings, etc. Describe any sampling
copstraints,
Describe building conditions (including RVAC conditions) that will exist within 24
2s prior to and during the sampling.
Discuss sample collection procedures. Include the following, at a minimum:
VIMS Assessment Checklist Version 1, July 2021

i Equipment to be used (passive samplers, Summa canisters & size, etc.)
YPlacement height of Summa canisters or passive samplers for indoor air and
ambient air collection to account for site specific breathing zone height of
anticipated occupants.
A Description of the indoor air summa canisters or passive samplers proposed
placement location including use of space (e.g., ground floor garage, first floor
living space, office, mechanical equipment room, etc.).
L/Methods implemented to reduce or eliminate access to building where indoor
air sampling is occurring
V(Whether Summa canisters are batch- or individually -certified. Dote: per
DEQ DWM VI Guidance, indoor air samples should utilize individually
certified Summa canisters
❑ Provide know often and when exterior ambient air samples will be collected (typically,
one sample per day per sampling event)
❑ If crawl space samples are proposed, include details on:
❑ Presence of moistureM barrier
❑ Ceiling structure of crawlspace.
❑ Exterior openings or ventilation features
❑ Height across entire footprint of crawl space
❑ Walls/vertical structures separating crawl space areas
❑ Additional pertinent details of crawl space construction
Section 4 — Laborator Anal ses
Mnclude the proposed analyte list and EPA Method numbers prepared in consultation
wip your DEQ Brownfields Project Manager;
EZ Minimum analytical requirements are described as outlined below:
a. Full TO-15 list is required initially for soil gas, sub -slab, and indoor air analyses.
b. Subsequent modifications of the analyte list, e.g., once sub -slab gas results are
known, may be made with advance approval from your Brownfields Project
Manager,
Note: Not all laboratories use the same standard analyte list. Ensure that na lithalene is
included, but exclude acrolein, unless it is a suspected site contaminant. Because of the
extremely limited analyte list for the TO-15 SIM method, discuss its use with your DEQ
Brownfields Project Manager prior to implementation. When approved for use, this method
should be used for both sub -slab and indoor air samples for comparison purposes.
2SDiscuss any proposed limitations on the contaminants of concern, if any, and the
reason for such. limitation (sufficient previous data, indoor air interferences, etc.).
[/Discuss laboratory certifications. Please note, NC does not certify laboratories for air
sapples, Please specify what certification the proposed air laboratory holds.
1Indicate the Reporting Limits/Method Detection Limits will meet applicable screening
criteria (to the extent feasible). Include reporting of J-flags to meet criteria.
VIMS Assessment Checklist Version 1, July 2021

Q1 Indicate what Level QA/QC will be reported by the laboratory. Level II QA/QC is
typically acceptable.
Section 5 — OAQC
Specify the duplicate sample frequency, Minimum requirement: 1 duplicate per 20
samples, per media, per method, per day of sampling.
Discuss chain of custody and shipping.
Section 6 — Investigation Derived Waste (IDW) Management
❑ Discuss what IDW will be generated and how it is proposed to be managed.
Management recommendations should be in accordance with 15A NCAC 02T.1503 and
15A NCAC 02H. 0106. Generally, if the Brownfields Property has not previously been
assessed, all IDW must be containerized and characterized prior to management.
Previous assessment data that indicate no Hazardous Waste (listed or characteristic) is
likely to be encountered in the area of proposed assessment will be required before thin
spreading of IDW on -site is permitted.
Section 7 — ltenortin
This section should discuss the components of the assessment report which will be prepared as a
result of the implementation of the work plan. At a minimum, the report shall include:
Chi Reporting/summary of site work conducted for all sections outlined above in this
checklist;
11 Summary of findings and possible recommendations;
I All applicable tables and figures outlined below with the addition of:
L� Tables for tabulated analytical data per media sampled and analyzed, compared against
applicable screening levels; any non -detectable levels should be reported as less than the
applicable reporting limit noting any reporting limits that exceed the respective screening
level.
2(Figure(s) depicting actual sample locations, with the results for each media depicted,
graphic scale and north arrow. Modify the figures as appropriate in the report if there was
variance with these locations during the sampling event;
L Detail on building additions, slab types and sub -grade features such as the locations of
crawl spaces, tunnels, basements, sub -grade walls, and footer walls encountered during
as essment.
Firm PE/PG License Number; and
Cdlndividual PE/PG seal & signature
VIMS Assessment Checklist Version 1, July 2021

Section 8 -- Example Tables and Format for Figua�es
91 Table 1 — Property Summary
Table l: Propermary
BF Project No.
Parcel
.Address
Site
Former/
Current
REC
Proposed
No.
Acreage
Use
e
56 Table 2 — Sampling Summary
Table 2: Sampling Summar
Data
Parcel/Bldg
Sampling
Type
Number
Depth
Analytical
Detection
range for
Gap
No.
Objective
of
,Sample
of
Samples
of
Samples
Program
TCE (if
a icable
2( Figure 1. — Site Location Map (topographic map base) with north arrow, graphic scale, and
site outline.
❑ Figure 2 — Proposed Redevelopment to include the following details:
❑ All current and proposed structures
❑ Brownfields Property Boundary
❑ Which structures will be removed/renovated
❑ Proposed future use of each building
7-
Lf Figure /- Proposed Sample Location Map (work plan) or Sample Location Map to include
the following details:
❑ High duality aerial and/or floor plan base (interior samples)
/Overlain planned or existing (to remain) building layout
dNorth arrow
VGraphic scale
!" Historical sample locations (if applicable)
❑ RECs or other areas of concern
[Proposed sample locations for each medium proposed for sampling
❑ Sample identification labels
❑ Appendix — TabuIar Summary of Historical Analytical Data
VIMS Assessment Checklist Version 1, July 2021

APPENDIX 6
INDOOR AIR LABORATORY
ANALYSIS DOCUMENTATION

tiff eurofins
Air Toxics
Method: Modified TO-15-LL + Naph
Compound
Rpt. Limit (ppbv)
Freon 12
0.50
Freon 114
0.10
Chloromethane
0.50
Vinyl Chloride
0.10
1,3-Butadiene
0.10
Bromomethane
0.50
Chloroethane
0.50
Freon 11
0.10
Ethanol
0.50
Freon 113
0.10
1,1-Dichloroethene
0.10
Acetone
1.0
2-Propanol
0.50
Carbon Disulfide
0.50
3-Chloropropene
0.50
Methylene Chloride
0.20
Methyl tert-butyl ether
0.10
trans-1,2-Dichloroethene
0.10
Hexane
0.50
1,1-Dichloroethane
0.10
2-Butanone (Methyl Ethyl Ketone)
0.50
cis-1,2-Dichloroethene
0.10
Tetrahydrofuran
0.50
Chloroform
0.10
1,1,1-Trichloroethane
0.10
Cyclohexane
0.50
Carbon Tetrachloride
0.10
2,2,4-Trimethyl pentane
0.50
Benzene
0.10
1,2-Dichloroethane
0.10
Heptane
0.50
Trichloroethene
0.10
1,2-Dichloropropane
0.10
1,4-Dioxane
0.10
Bromodichloromethane
0.10
cis-1,3-Dichloropropene
0.10
4-Methyl-2-pentanone
0.10
Toluene
0.10
trans-1,3-Dichloropropene
0.10
1,1,2-Trichloroethane
0.10
Tetrachloroethene
0.10
2-Hexanone
0.50
Reporting Limits cited do not take into account sample dilution due to canister pressurization.
Page 1

tiff eurofins
Air Toxics
Method: Modified TO-15-LL + Naph
Compound
Rpt. Limit (ppbv)
Dibromochloromethane
0.10
1,2-Dibromoethane (EDB)
0.10
Chlorobenzene
0.10
Ethyl Benzene
0.10
m,p-Xylene
0.10
o-Xylene
0.10
Styrene
0.10
Bromoform
0.10
Cumene
0.10
1,1,2,2-Tetrachloroethane
0.10
Propylbenzene
0.10
4-Ethyltoluene
0.10
1,3,5-Trimethyl benzene
0.10
1,2,4-Trimethylbenzene
0.10
1,3-Dichlorobenzene
0.10
1,4-Dichlorobenzene
0.10
alpha-Chlorotoluene
0.10
1,2-Dichlorobenzene
0.10
1,2,4-Trichlorobenzene
0.50
Hexachlorobutadiene
0.50
Naphthalene
0.50
Surrogate Method Limits
1,2-Dichloroethane-d4 70-130
Toluene-d8 70-130
4-Bromofluorobenzene 70-130
Reporting Limits cited do not take into account sample dilution due to canister pressurization.
Page 2

•ti` e u rof i n s Laboratory Quality Assurance Manual
ti. Appendix E
Air Toxics Page 55
B
ANALYTICAL METHODS
Section 12.0
Method: EPA Method TO-14A/TO-15 Volatile Organic Compounds (Low -Level)
Eurofins Air Toxics SOP #83 Revision 22 Effective Date: November 4, 2020 Methods Manual Summary
Description: This method involves full scan gas chromatograph/mass spectrometer (GC/MS)
analysis of whole air samples collected in evacuated stainless steel canisters. Samples are
analyzed for volatile organic compounds (VOCs) using EPA Method TO-14A/TO-15 protocols.
An aliquot of up to 400 mL of air is withdrawn from the canister utilizing a mass flow controller.
This volume is loaded onto a hydrophobic multibed sorbent trap to remove water and carbon
dioxide and to concentrate the vapor sample. The focused sample is then flash -heated to
sweep adsorbed VOCs onto a GC/MS for separation and detection. Compounds are detected
using a mass spectrometer operating in full scan mode.
Eurofins Air Toxics maintains a suite of TO-14A/TO-15 methods, each optimized to efficiently
meet the data objectives for a wide range of targeted concentration ranges. The methods, their
reporting limits, and typical applications are summarized in the table below. This method
summary describes TO-14A/T0-15 (Low -Level).
Eurofins Air Toxics Method
Base Reporting Limits
Typical Application
TO-14A/TO-15 (5&20)
5 — 20 ppbv
Soil gas and ppmv range vapor
matrices
TO-14A/TO-15 (Standard or
Quad)
0.5 — 5.0 ppbv
Ambient air, soil gas, and ppbv
level va or matrices
TO-15 (Extended)
0.2 — 5.0 ppbv
Ambient air and ppbv level vapor
matrices
TO-14A/TO-15 Low-level
0.1 — 1.0 ppbv
Indoor and outdoor air
TO-14A/TO-15 SIM
0.01 — 0.5 ppbv
Indoor and outdoor air
TO-15 HSS
0.01 — 0.1 ppbv
Soil gas and other high
concentration matrices
Certain compounds are not included in Eurofins Air Toxics' standard target analyte list. These
compounds are communicated at the time of client proposal request. Unless otherwise directed,
Eurofins Air Toxics reports these non -routine compounds with partial validation. Validation may
include a 3-point calibration with the lowest concentration defining the reporting limit, no second
source verification analyzed, and no method detection limit study performed unless previous
arrangements have been made. In addition, stability of the non-standard compound during
sample storage is not validated. Full validation may be available upon request.
Since Eurofins Air Toxics applies TO-15 methodology to all SummaTM canisters regardless of
whether TO-14A or TO-15 is specified by the project, Eurofins Air Toxics performs a modified
version of method TO-14A as detailed in Table 1. Please note that Methods TO-14A and TO-15
were validated for specially treated canisters. As such, the use of Tedlar bags for sample
collection is outside the scope of the method and is not recommended for ambient or indoor air
samples. It is the responsibility of the data user to determine the usability of TO-14A and TO-15
results generated from Tedlar bags.
COMPANY CONFIDENTIAL

•ti` e u rof i n s Laboratory Quality Assurance Manual
ti•• Appendix E
Air Toxics Page 56
All samples submitted for TO-15 Low -Level are screened prior to analysis. If samples contain
high concentrations of target and/or non -target VOCs, samples may be analyzed by an
alternative TO-15 method (i.e., Standard or 5&20) with a higher dynamic calibration range.
Table 1. Summary of TO-14A Method Modifications
Requirement
TO-14A
Eurofins Air Toxics Modifications
Sample Drying System
Nafion Dryer
Multibed hydrophobic sorbent
Blank acceptance
< 0.2 ppbv
< RL
criteria
BFB ion abundance
Ion abundance
Follow abundance criteria listed in TO-15.
criteria
criteria listed in
Table 4 of TO-14A
BFB absolute
abundance criteria
Within 10% when
CCV internal standard area counts are compared to ICAL;
comparing to the
corrective action taken when recovery is less than 60%.
previous daily BFB
Blanks and standards
Zero Air
UHP Nitrogen provides a higher purity gas matrix than zero
air for trace level measurements.
Initial Calibration
<_ 30% RSD for
<_ 30% RSD with 4 compounds allowed out to <_ 40%
listed 39 VOCs
Table 2. Summary of Method TO-15 Modifications
Requirement
TO-15
Eurofins Air Toxics Modifications
Initial Calibration
<_ 30% RSD with 2
<_ 30% RSD with 4 compounds allowed out to <_ 40%
compounds allowed
out to < 40% RSD
Blanks and standards
Zero Air
UHP Nitrogen provides a higher purity gas matrix than zero
air for trace level measurements.
The standard target analyte list, reporting limits (RL), also referred to as Limit of Quantitation
(LOQ), Quality Control (QC) criteria, and QC summary can be found in tables 3 through 6.
COMPANY CONFIDENTIAL

li e u rof i n s Laboratory Quality Assurance Manual
ti• Appendix E
Air TOXIC` Page 57
Table 3. Method TO-14A/TO-15 Standard Analyte List (Low -Level) and QC Limits
Anal to
y
RL/LOQ
(ppbv)
QC Acceptance Criteria
I
(CAL
(%RSD)
CCV
(%R)
ICV/LCS*
(%R)
Precision
Limits
(Max. RPD)
1,1,2,2-Tetrachloroethane
0.1
<_ 30%
70 - 130
70 - 130
± 25
1,1,2-Trichloroethane
0.1
<_ 30%
70 - 130
70 - 130
± 25
1,1-Dichloroethane
0.1
<_ 30%
70 - 130
70 - 130
± 25
1,1-Dichloroethene
0.1
<_ 30%
70 - 130
70 - 130
± 25
1,2,4-Trichlorobenzene
0.5
<_ 30%
70 - 130
70 - 130
± 25
1,2,4-Trimethylbenzene
0.1
<_ 30%
70 - 130
70 - 130
± 25
1,2-Dibromoethane EDB)
0.1
<_ 30%
70 - 130
70 - 130
± 25
1,2-Dichlorobenzene
0.1
<_ 30%
70 -130
70 -130
± 25
1,2-Dichloroethane
0.1
<_ 30%
70 - 130
70 - 130
± 25
1,2-Dichloropropane
0.1
<_ 30%
70 - 130
70 - 130
± 25
1,3,5-Trimethyl benzene
0.1
<_ 30%
70 -130
70 - 130
± 25
1,3-Dichlorobenzene
0.1
<_ 30%
70 - 130
70 - 130
± 25
1,4-Dichlorobenzene
0.1
<_ 30%
70 - 130
70 - 130
± 25
Benzene
0.1
<_ 30%
70 - 130
70 - 130
± 25
Bromomethane
0.5
<_ 30%
70 - 130
70 - 130
± 25
Carbon Tetrachloride
0.1
<_ 30%
70 - 130
70 - 130
± 25
Chlorobenzene
0.1
<_ 30%
70 - 130
70 - 130
± 25
Chloroethane
0.5
<_ 30%
70 - 130
70 - 130
± 25
Chloroform
0.1
<_ 30%
70 - 130
70 - 130
± 25
Chloromethane
0.5
<_ 30%
70 - 130
70 - 130
± 25
Chlorotoluene Benzyl Chloride
0.1
<_ 30%
70 - 130
70 - 130
± 25
cis- 1,2-Dichloroethene
0.1
_< 30%
70 - 130
70 - 130
± 25
cis- 1,3-Dichloro ro ene
0.1
<_ 30%
70 -130
70 -130
± 25
Dichloromethane (Methylene
Chloride
Eth (benzene
0.2
<_ 30%
70 - 130
70 - 130
70 - 130
± 25
0.1
<_ 30%
70 - 130
± 25
Freon 11 Trichlorofluoromethane
0.1
<_ 30%
70 - 130
70 - 130
± 25
Freon 113 (Trichlorotrifluoroethane)
Freon 114
0.1
<_ 30%
70 - 130
70 - 130
± 25
0.1
<_ 30%
70 -130
70 -130
± 25
Freon 12 Dichlorodifluoromethane
0.5
<_ 30%
70 - 130
70 - 130
± 25
Hexachlorobutadiene
0.5
<_ 30%
70 -130
70 -130
± 25
m, -X lene
0.1
<_ 30%
70 -130
70 -130
± 25
COMPANY CONFIDENTIAL

li e u rof i n s Laboratory Quality Assurance Manual
ti• Appendix E
Air TOxics Page 58
Analyte
RL/LOQ
(ppbv)
0.1
QC Acceptance Criteria
ICAL
(%RSD)
CCV
(%R)
ICV/LCS*
(%R)
Precision
Limits
(Max. RPD)
Methyl Chloroform (1,1,1-
Trichloroethane)
_< 30%
70 - 130
70 - 130
± 25
o-X lene
0.1
<_ 30%
70 - 130
70 - 130
± 25
Styrene
0.1
<_ 30%
70 -130
70 -130
± 25
Tetrachloroethene
0.1
<_ 30%
70 -130
70 -130
± 25
Toluene
0.1
< 30%
70 -130
70 -130
± 25
trans- 1,3-Dichloropropene
0.1
<_ 30%
70 -130
70 -130
± 25
Trichloroethene
0.1
<_ 30%
70 -130
70 -130
± 25
Vinyl Chloride
0.1
<_ 30%
70 - 130
70 - 130
± 25
1,3-Butadiene
0.1
<_ 30%
70 -130
70 -130
± 25
1,4-Dioxane
0.1
<_ 30%
70 -130
70 -130
± 25
2-Butanone (Methyl Ethyl Ketone
0.5
<_ 30%
70 - 130
70 - 130
± 25
2-Hexanone
0.5
<_ 30%
70 -130
70 -130
± 25
4-Eth (toluene
0.1
<_ 30%
70 - 130
70 - 130
± 25
4-Meth I-2-Pentanone MIBK
0.1
<_ 30%
70 - 130
70 - 130
± 25
Acetone
1.0
<_ 30%
70 - 130
70 - 130
± 25
Bromod ichlorom ethane
0.1
<_ 30%
70 - 130
70 - 130
± 25
Bromoform
0.1
<_ 30%
70 - 130
70 - 130
± 25
Carbon Disulfide
0.5
<_ 30%
70 - 130
70 - 130
± 25
Cumene
0.1
<_ 30%
70 - 130
70 - 130
± 25
Cyclohexane
0.5
<_ 30%
70 - 130
70 - 130
± 25
Dibromochloromethane
0.1
<_ 30%
70 - 130
70 - 130
± 25
Ethanol
0.5
<_ 30%
70 - 130
70 - 130
± 25
Heptane
0.5
<_ 30%
70 - 130
70 - 130
± 25
Hexane
0.5
_< 30%
70 - 130
70 - 130
± 25
Iso ro anol
0.5
<_ 30%
70 -130
70 -130
± 25
Methyl tert-But I Ether MTBE
0.1
<_ 30%
70 - 130
70 - 130
± 25
Propylbenzene
Tetrah drofuran
0.1
<_ 30%
<_ 30%
70 - 130
70 - 130
70 - 130
70 - 130
70 - 130
± 25
± 25
0.5
trans- 1,2-Dichloroethene
0.1
<_ 30%
70 - 130
± 25
2,2,4-Trimethyl pentane
0.5
<_ 30%
70 -130
70 -130
± 25
3-Chloro rene
0.5
<_ 30%
70 -130
70 -130
± 25
Naphthalene"
0.5
<_ 40%
60 -140
60 -140
± 25
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tiff` e u rof i n s
Air Toxics
Laboratory Quality Assurance Manual
Appendix E
Page 59
QC Acceptance Criteria
Analyte
RL/LOQ
(ppbv)
ICAL
CCV
ICV/LCS*
Precision
(%RSD)
(%R)
(%R)
Limits
(Max. RPD)
1-Point
ICV only:
TPH (Gasoline)***
10
Calibration
N/A
60 — 140
± 25
NMOC (Hexane/Heptane)***
2.0
1- Point
Calibration
N/A
N/A
± 25
*See Table 6.
**Due to its low vapor pressure, Naphthalene does not meet TO-15 performance requirements. The
wider QC limits reflect typical performance. Although Naphthalene is not on Eurofins Air Toxics
"standard" TO-15 list, it is commonly requested and therefore included in Table 3.
***TPH and NMOC are not on Eurofins Air Toxics' standard TO-15 list, but are included in Table 3 due to
common requests.
Table 3 is the list of Standard compounds, reporting limits and QC acceptance criteria. Each
project may be customized as needed. Additional compounds and different reporting limits may
be obtainable and/or achieved upon request
Table 4. Internal Standards
Table 5. Surrogates
Analyte
Accuracy
( /o R)
Analyte
Accuracy
(/o R)
Bromochloromethane
60 — 140
1,2-Dichloroethane-d4
70 — 130
1,4-Difluorobenzene
60 — 140
Toluene-ds
70 — 130
Chlorobenzene-ds
60 — 140
T4-Bromofluorobenzene
i 70 — 130
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•ti` e u rof i n s Laboratory Quality Assurance Manual
ti. Appendix E
Ail' TOXics Page 60
Table 6. Summary of Calibration and QC Procedures for Methods TO-14A/TO-15 Low -Level
QC Check
Minimum
Acceptance
Corrective
Frequency
Criteria
Action
Tuning Criteria
Every 24 hours
TO-15 ion abundance criteria
Correct problem then repeat
tune.
Minimum 5-Point
Prior to sample
% RSD <_ 30 with 4 compounds
Correct problem then repeat
Initial Calibration
analysis
allowed out to <_ 40% RSD
Initial Calibration curve.
(ICAL)
Initial Calibration
After each Initial
Recoveries for 85% of Standard
Check the system and re -
Verification and
Calibration curve,
compounds must be 70-130%.
analyze the standard. Re -
Laboratory Control
and daily prior to
No recovery may be < 50%.
prepare the standard if
Spike (ICV and
sample analysis
ICV is evaluated on a full list
necessary to determine the
LCS)
basis at the time of calibration.
source of error. Re -calibrate
the instrument if the primary
If specified by the project, in-
standard is found to be in error.
house generated control limits
ma be used.
Initial Calibration
Per client request
Recoveries of compounds must
Check the system and re -
Verification and
or specific project
be 60-140%. No recovery may
analyze the standard. Re -
Laboratory Control
requirements only
be <50%.
prepare the standard if
Spike (ICV and
necessary to determine the
LCS) for Non-
source of error. Re -calibrate
standard
the instrument if the primary
Compounds
standard is found to be in error.
Continuing
At the start of
70-130%
Compounds exceeding this
Calibration
each analytical
criterion and associated data
Verification (CCV)
clock (24-hours)
will be flagged and narrated
for Standard
after the tune
with the exception of high bias
compounds
check
associated with non -detects.
If more than 4 compounds from
the standard list recover
outside of 70-130% or >10% of
VOCs if short list is used (40
compounds or less), corrective
action will be taken. If any
compound exceeds 60-140%,
samples are not analyzed
unless data meets project
needs. Check the system and
re -analyze the standard. Re -
prepare the standard if
necessary. Re -calibrate the
instrument if the criteria cannot
be met.
COMPANY CONFIDENTIAL

•ti` e u rof i n s Laboratory Quality Assurance Manual
ti. Appendix E
Air TOXics Page 61
QC Check
Minimum
Acceptance
Corrective
Frequency
Criteria
Action
Continuing
Per client request
Recoveries of compounds must
Check the system and re -
Calibration
or specific project
be 60-140%. No recovery may
analyze the standard. Re -
Verification (CCV)
requirements only
be <50%.
prepare the standard if
for Non -Standard
necessary to determine the
compounds
source of error. Re -calibrate
the instrument if the primary
standard is found to be in error.
Laboratory
After analysis of
Results less than the laboratory
Inspect the system and re -
Blank
standards and
reporting limit
analyze the blank. "B"-flag
prior to sample
data for common contaminants.
analysis, or when
contamination is
present
Internal
As each standard,
Retention time (RT) for blanks
For blanks: Inspect the
Standard
blank, and sample
and samples must be within
system and reanalyze the
(IS)
is being loaded
±0.33 min of the RT in the CCV
blank.
and within ± 40% of the area
counts of the daily CCV internal
For samples: Re -analyze the
standards.
sample unless obvious matrix
interference is documented. If
the ISs are within limits in the
re -analysis, report the second
analysis. If ISs are out -of -limits
a second time, report data from
first analysis and narrate.
Surrogates
As each standard,
70-130% R
For blanks: Inspect the
blank, and sample
system and re -analyze the
is being loaded
If specified by the project, in-
blank
house generated control limits
may be used.
For samples: Re -analyze the
sample unless obvious matrix
interference is documented. If
the %Rs are within limits in the
re -analysis, report the second
analysis. If %Rs are out -of -
limits a second time, report
data from first analysis and
narrate.
Laboratory
One per analytical
RPD <_25%
Narrate exceedances. If more
Duplicates -
batch
than 5% of compound list is
Laboratory Control
outside criteria or if compound
Spike Duplicate
is >40% RPD, investigate the
(LCSD)
cause and perform
maintenance as required. If
instrument maintenance is
required, calibrate as needed.
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