Document e7V5My53eO8kE1N5VG59Nw1X4

ASBESTOS FIBER COUNT ANALYSIS N for DOW CHEMICAL COMPANY Post Office Box 150 B-3502E Hwy 1 Plaquemine, Louisiana 70764 ATTENTION: Jackie Paul June 15, 1988 88-3810 DO A 1 1 CONFTDFNTT A1 J ,p WESTPA1NE *{cr ^JgJrotato'tieA inc. , 7979 GSRI AVE BATON ROUGE, LA 70820 DOW CHEMICAL COMPANY Plaquemine, Louisiana June 15, 1988 Eight (8) filter cassette samples were received on June 14, 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 400X. The procedure recommended by NIOSH Method 7400A was followed. Pertinent information regarding.fiber counts is as follows: Field Area: 0.00785 miri (Walton Beckett Graticule) Effective Collecting Area: ,, 385 mirC (25mm Cassette) 855 mnr (37mm Cassette) Limit of Quantitation: 10 fibers/100 fields Limit of Detection: > Average Blank Count * Detection limits are based upon a minimal count of fibers/100 fields. 10 Results are as follows: Sample ID. Fibers (>5um) Observed No. of Fields Observed Fibers per Filter Volume of Air (L^ Fibers (>5um) per c.c. of Air 08559 08560 Blank 0954 0955 0956 0959 0960 19-1 = 18 17-1 = 16 8-1 = 1 7 9-1 = 8 38-1 = 37 1-1 = 0 16-1 = 15 100 100 100 100 100 100 100 100 8,828 7,847 490 3,433 3,924 18,147 <490 7,357 -- -- ------ ---------- n Philip W. West, Ph.D. Laboratory Director DO A 116540 0ONFTDFNTT A1 J