Attn:
Customer Project:
Reference #: Date: 04/26/23
Analysis and Method
Discussion
Qualifications
CA Labs
Dedicated to Quality
Dedicated to QualityDedicated to Quality
Dedicated to Quality
Crisp Analytical, L.L.C.
1929 Old Denton Road
Carrollton, TX 75006
Phone 972-242-2754
Fax 972-242-2798
CA Labs, L.L.C.
12232 Industriplex, Suite 32
Baton Rouge, LA 70809
Phone 225-751-5632
Fax 225-751-5634
Materials Characterization - Bulk Asbestos Analysis
Laboratory Analysis Report - Polarized Light
DC Environmental
David Charlesworth
PO Box 9315
Albuquerque, NM 87119
DCE 23-109 Gibson Medical Center
CAL23043393RL
Summary of polarized light microscopy (PLM / Stereomicroscopy bulk asbestos analysis) using the methods described in 40CFR Part 763
Appendix E to Subpart E (Interim and EPA 600 / R-93 / 116 (Improved). The sample is first viewed with the aid of a stereomicroscope. Numerous
liquid slide preparations are created for analysis under the polarized microscope where identifications and quantifications are preformed. Calibrated
liquid refractive oils are used as liquid mouting medium. These oils are used for identification (dispersion staining). A calibrated visual estimation is
reported, should any asbestiform mineral be present. Other techniques such as acid washing are used in conjugation with refractive oils for detection
of smaller quantities of asbestos. All asbestos percentages are based on calibrated visual estimation traceable to NIST standards for regulated
asbestos. Traceability to measurement and calibration is achieved by using known amounts and types of asbestos from standards where analyst and
laboratory accuracy are measured. As little as 0.001% asbestos can be detected in favorable samples, while detection in unfavorable samples may
approach the detection limit of 0.50% (well above the laboratory definition of trace).
Vermiculite containing samples may contain trace amounts of actinolite/tremolite. When not detected by PLM, these samples should be analyzed
using TEM methods and / or water separation techniques. Suspected actinolite/vermiculite presence will be indicated through the sample comment
section of this report.
Fibrous talc containing samples may contain a regulated asbestos fiber known as anthophyllite. Under certain conditions the same fiber may
actually contain both talc and anthophyllite (a phenomenon called intergrowth). Again, TEM detection methods are recommended. CA Labs PLM
report comments will denote suspected amounts of asbestiform anthophyllite with talc, where further analysis is recommended.
Some samples (floor tiles, surfacings, etc.) may contain fibers too small to be detectable by PLM analysis and should be analyzed by TEM bulk
protocols.
A "trace asbestos" will be reported if the analyst observes far less than 1% asbestos. CA Labs defines "trace asbestos" as a few fibers detected by
the analyst in several preparations and will indicate as such under these circumstances.
Since allowable variation in quantification of samples close to 1% is high, <1% may be reported. Such results are ideal for point counting, and the
technique is mandatory for friable samples (NESHAP, Nov. 1990 and clarification letter 8 May 1991) under 1% percent asbestos or "trace asbestos".
In order to make all initial PLM reports issued from CA Labs NESHAP compliant, all <1% asbestos results (except floor tiles) will be point
counted at no additional charge.
CA Labs is accredited by the National Voluntary Accreditation Program (NVLAP) for selected test methods for airborne fiber analysis (TEM), and
for bulk asbestos fiber analysis (PLM). CA Labs is also accredited by AIHA LAP, LLC. in the PLM asbestos field of testing for Industrial Hygiene. All
analysts have completed college courses or hold a degree in a natural science (geology, biology, or environmental science). Recognition by a state
professional board in one these disciplines is preferred, but not required. Extensive in-house training programs are used to augment the educational
background of the analyst. The Laboratory Director and Quality Manager have received supplemental McCrone Research training for asbestos
identification. Analysis performed at Crisp Analytical Labs, LLC 1929 Old Denton Road Carrollton, TX 75006
Dallas NVLAP Lab Code 200349-0 TEM/PLM TCEQ# T104704513-15-3 TDH 30-0235
AIHA LAP, LLC Laboratory #102929
Labs
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