B09_A1_Attach_16_Asbestos_rpt-kitchen_crawl_space_soil_(1)_0001.pdf
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This analytical report describes the results of asbestos analysis performed on one or more samples submitted according to the California Air Resources Board Method 435. The samples were prepared through standard CARB 435 procedures including drying, crushing, pulverizing, and mounting on microscope slides with refractive index oil. Polarized light microscopy was used to analyze the various materials present, including asbestos. If asbestos was identified at less than 10% concentration, additional point counting was performed with 50 points counted on each of eight slides for a total of 400 points. The report is subjected to quality assurance checks before release.
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Text version
ASBESTOS TEM LABORATORIES, INC.
Analytical Report
630 Bancroft Way Berkeley, CA 94710
Laboratory Job #
Polarized Light Microscopy
(510) 704-8930
FAX (510) 704-8429
CARB Method 435
1515-00002
ASBESTOS TEM LABORATORIES, INC
Enclosed please find the bulk material analytical results for one or more samples submitted for asbestos analysis.
The analyses were performed in accordance with the California Air Resources Board (ARB) Method 435 for the determination of asbestos in serpentine aggregate samples.
Prior to analysis, samples are logged-in and all data pertinent to the sample recorded. The samples are checked for damage or disruption of any chain-of-custody seals. A unique laboratory ID number is assigned to each sample. A hard copy log-in sheet containing all pertinent information concerning the sample is generated. This and all other relevant paper work are kept with the sample throughout the analytical procedures to assure proper analysis.
Sample preparation follows a standard CARB 435 prep method. The entire sample is dried at 135-150 C and then crushed to ~3/8" gravel size using a Bico Chipmunk crusher. If the submitted sample is >1 pint, the sample was split using a 1/2" riffle splitter following ASTM Method C-702-98 to obtain a 1 pint aliquot. The entire 1 pint aliquot, or entire original sample, is then pulverized in a Bico Braun disc pulverizer calibrated to produce a nominal 200 mesh final product. If necessary, additional homogenization steps are undertaken using a 3/8" riffle splitter. Small aliquots are collected from throughout the pulverized material to create three separate microsope slide mounts containing the appropriate refractive index oil. The prepared slides are placed under a polarizing light microscope where standard mineralogical techniques are used to analyze the various materials present, including asbestos. If asbestos is identified and of less than 10% concentration by visual area estimate then an additional five sample mounts are prepared. Quantification of asbestos concentration is obtained using the standard CAL ARB Method 435 point count protocol. For samples observed to contain visible asbestos of less than 10% concentration, a point counting techinique is used with 50 points counted on each of eight sample mounts for a total of 400 points. The data is then compiled into standard report format and subjected to a thorough quality assurance check before the information is released to the client.
While the CARB 435 method has much to commend it, there are a number of situations where it fails to provide sufficient accuracy to make a definitive determination of the presence/absence of asbestos and/or an accurate count of the asbestos concentration present in a given sample. These problems include, but are not limited to, 1) statistical uncertainty with samples containing <1% asbestos when too few particles are counted, 2) definitive identification and discrimination between various fibrous amphibole minerals such as tremolite/actinolite/hornblende and the "Libby amphiboles" such as tremolite/winchite/richterite/arfvedsonite, and C) small asbestiform fibers which are near or below the resolution limit of the PLM microscope such as those found in various California coast range serpentine bodies. In these cases, further analysis by transmission electron microscopy is recommended to obtain a more accurate result.
Sincerely Yours, Lab Manager
ASBESTOS TEM LABORATORIES, INC.
--- These results relate only to the samples tested and must not be reproduced, except in full, without the approval of the laboratory. ---
Dave Norman
LABORATORY JOB # 1515-00002
Majestic 0120117004
4Polarized light microscopy analytical results for bulk sample(s).
Job Site:
Job No.:
RE:
Oct/26/2017
Provost & Pritchard Consulting Group 2505 Alluvial Ave Clovis, CA 93611
630 BANCROFT WAY BERKELEY, CA 94710 PH. (510) 704-8930 FAX (510) 704-8429
1350 FREEPORT BLVD. UNIT 104, SPARKS, NV 89431 With Branch Offices Located At:
CA DPH ELAP
Lab No. 1866
NVLAP Lab Code: 101891-0 Berkeley, CA
CARB 435 ANALYTICAL REPORT
Contact:
Address:
Job Site / No.
% TYPE
Samples Submitted:
Samples Analyzed:
ASBESTOSSAMPLE ID LOCATION /
DESCRIPTION
Date Submitted:
Date Reported:
Lab ID #
Lab ID #
Lab ID #
Lab ID #
Lab ID #
Lab ID #
Lab ID #
Lab ID #
Lab ID #
Lab ID #
- Total Points
POINTS
Analyst
ASBESTOS TEM LABORATORIES, INC. 600 BANCROFT WAY, STE. A, BERKELEY, CA 94710 PH. (510) 704-8930
QC Reviewer
COUNTED
POLARIZED LIGHT MICROSCOPY
Majestic 0120117004
Oct-12-17 Oct-26-17
Dave Norman
A
1515-00002-001
<0.25% None Detected Quad #1.
No Asbestos Detected
B
1515-00002-002
<0.25% None Detected Quad #2
No Asbestos Detected
C
1515-00002-003
<0.25% None Detected Quad #3
No Asbestos Detected
D
1515-00002-004
<0.25% None Detected Quad #4
No Asbestos Detected
- Total Points
- Total Points
- Total Points
- Total Points
- Total Points
- Total Points
- Total Points
- Total Points
- Total Points
Report No. 353231
Provost & Pritchard Consulting Group2505 Alluvial Ave Clovis, CA 93611
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