Walk-Through Survey Report of Potash Facility Amax Chemical, Inc. Carlsbad, New Mexico.
NIOSH 1980 Mar:6 pages
Worker exposure to diesel exhaust emissions was investigated at the Potash Facility (SIC-2819), Amax Chemical, Inc. in Carlsbad, New Mexico, on February 8, 1980. Amax employed 301 workers underground over three shifts, 7 days a week. Complete files on inactive workers were retained for epidemiological followup. Carbon-monoxide (630080) direct reading indicator tubes registered about 5 parts per million (ppm), carbon-dioxide (10102440) about 1600ppm, and nitrogen- dioxide (124389) about 2.5ppm. Off gases leaving the blast area through the main exhaust air corridor exceeded the measurement tube's capacity (greater than 60ppm). Measurements in an operating face indicate that the air velocity ranged from 25 to 45 linear feet per minute (lfm) in the primary incoming air passages to 90 to 100lfm leaving the entry face, using a face fan. The author suggests that most exposures to diesel exhaust emissions are distributed equally throughout the mine because the use of most diesel vehicles is not directly related to production. Exposure would likely be highest to those working in the mine toward the outlet of the exhausted air. The author recommends further study into exposures in the mine, the contributory effect of blasting to total noxious gas exposure, which job categories represent those most highly exposed, and what are individual exposure concentrations.
NIOSH-Author; NIOSH-Survey; Field-Study; IWS-122-17; Region-6; Health-surveys; Worker-health; Industrial-hygiene; Diesel-emissions; Combustion-products;
630-08-0; 10102-44-0; 124-38-9;
NTIS Accession No.
Division of Surveillance, Hazard Evaluations and Field Studies, NIOSH, Cincinnati, Ohio, 6 pages