Document gaQneNgqQd47Zq2kDvzj8KRGq

.p WEST-PAIN E atotieA inc. i 7979 GSRIAVE BATON ROUGE LA 70820 ASBESTOS FIBER COUNT ANALYSIS A for DOW CHEMICAL COMPANY Louisiana Hwy 1 Plaquemine, Louisiana 70764 ATTENTION: Jackie Paul August 3, 1988 lab 88-5070 DO A 116546 OONFTDFNTTAI DOW CHEMICAL COMPANY Plaquemine, Louisiana August 3, 1988 Fourteen (14) filter cassette samples were received on August 1, 1988, from Dow Chemical Company for asbestos fiber count. Fibers larger than 5 microns in length were counted by means of phase-contrast microscopy at a magnification of 4 00X. The procedure recommended by NIOSH Method 7400A was followed. Pertinent information regarding-fiber counts is as follows: Field Area: 0.00785 min (Walton Beckett Graticule) Effective Collecting Area: ,, 385 nmu (25mm Cassette) 855 mni (37mm Cassette) Limit of Quantitation: 10 fibers/100 fields Limit of Detection: > Average Blank Count * Detection limits are based upon a minimal concentration fibers/mni . of 7 Samole ID. Fibers (>5um) Observed No. of Fields Observed Fibers per Filter Volume of Air fLI Fibers (>5um) per c.c. of Air 09038 09039 09040 09041 09042 09043 09044 09045 09046 75 - 2 = 73 25 - 2 = 23 22 - 2 = 20 21 - 2 = 19 17 - 2 = 15 8 -2 = 6 12 - 2 = 10 280 13 - 2 = 11 100 100 100 100 100 100 100 20 100 35,803 11,280 9,809 9,319 7,357 2,943 4,905 685,643 5,395 DO A 116547 CONFIDENT TA! J Samole ID. 09047 09048 09049 Blank Blank DOW CHEMICAL COMPANY Plaquemine, Louisiana August 3, 1988 Fibers (>5um) Observed No. of Fields Observed Fibers per Filter Volume of Air (h) Fibers (>5um) per c.c. of Air 15 - 2 = 13 94 - 2 = 92 100 4 0 100 100 30 100 100 6,376 45,122 162,501 1,962 <490 Philip w.' West, Ph.D. Laboratory Director DO A 116548 OONFTDFNTIAI J