Document npg1On3OLrepQ8E52njqO9YgR

liAOER I.AUORATORIES. INCORPORATED ANALYTICAL SERVICES FOR INDUSTRY , ARO t 2 8 |A~y REPORT ON SERVICE NUMBER 4328 November 26, 1980 To: Analysis: Method: Results: Mr. Steve Sellers Brown & Root Inc., Houston, TX Fifteen membrane filter samples and one blank for asbestos fiber count. NIOSH Procedure P&CAM 239. Filter wedges are examined at 450X using polarizing and phase contrast microscopes. Birefringent fibers longer than 5 microns with a length-towidth ratio of 3:1 or more are counted as asbestos. Sample Number 80-027E 80-028C 80-029F S0-030E 80-03 IE S0-032M 80-033F 80-034E 80-035F 80-036F S0-037M 80-038M 80-039E S0-040F 80-041C Total Fibers less blank 24,400. 3,700. 7,800. 3,700. 11,700. 25,400. 13,700. 26,300. 78,200. 27,400. 31,300. ND(1,200.) 34,200. 61,600. 3,700. Air Volume liters 16. 476. 20. 62. 38. 36. 38. 526. 20. 18. 24. 10. 20. 16. 126. Air Concentration fibers/cc 1.5 LT(.Ol) 0.39 0.06 0.31 0.71 0.36 0.05 3.9 1.5 1.3 ND(.2) 1.7 3.8~ 0.03 4725 Paris Street/ Denver, Colorado 80239 / (303) 371-1441 RRH 929 ARM000060 'a; < . . ' \; ) Arewr t\ Ro-. ! November 26, :9&Z ' k.. i Discussion: N'D( ) indicates none of the substance was detected, with a detection limit shown in the parentheses. LT( ) indicates "less than" with a detection limit shown in the parentheses. The OSHA permissible exposure limit (PEL) for asbestos is 2 fibers/cc. Raw data is filed and available upon request. Submitted by: --Robert' N. Wage Laboratory Director^ RNH/mff / SRM 930 ARM000061