Document 44nX0wOgR8425xBQX92jqZOvx

Consumer Protection and Environmental Health Services Environmental Control Administration September 6, 1969 Mr. Charles B. Mallory Works Manager American Brake Shoe Company Winchester, Virginia 22633 Dear Mr. Mallory: Attached are the results of the air samples taken in your plant in December 1968. The results of the impinger samples were sent earlier, but are included here to show their relationship to the membrane filter sample results. The membrane filter samples were counted in accordance with the method prescribed by the American Conference of Governmental Industrial Hygienists (ACGIH) The results can be compared to the 1968" Notice of Intended Changes" Threshold Limit Value of 12 fibers per milliliter greater than 5p in length As in the previous survey of your plant conducted in September, 1965, no samples indicated dust or fiber concentrations above the TLV Sincerely yours. Attachment cc Virginia State Dept of Health Dr. Ligo B Weidner Roger F Schmid Assistant Sanitary Engineer Field Studies Bureau of Occupational Safety and Health