Document G6wzzQJenQdXjDay6ZOZa99DN

FILE NAME: WR Grace (WRG) DATE: Unknown DOC#: WRG313 DOCUMENT DESCRIPTION: 0000 Inspection Results of Texas Vermiculite Company. Incomplete document. TEXAS VERMICULITE COMPANY 8651 Manila Road Dallas, Texas At the request of the Texas V e m i c u l i t e Company, a study wn3 made of the dust conditions in the plant at 2G51 Manila Road. Mur. R. L. Junker, Manager of the plant, provided operational details.of the processes, which in general expand by heat, certain;p.ica and volc.anic glass- mate.rial.3 to produce a verylight-weight aggregate; This material has a variety of. properties and many uses in industry, one of which is theproduction of an acoustical material, Zonolite, containing about 2C% asbestos fiber. . Air samples were taken in a 25% ethyl alcohol solution with ' . a. nidge tpLcipinger. The periods of sampling, wore from 12 to. . ' - H 5 riinutCo: in area:* believed.to he'reasoihsji^y.rcpressn'tatij^.-*' of the conditidns'ir^tne-environment of'the'workers. :Dust-' *: particles in the samples were later counted, using standard methods in a Spencer bright-line counting charier, under 1 --iO'O' K ifia.gnific.a-tion. and ,tran ami tied light..-.,. : ,, * ,, . * i Sample Mo. 1 taken in the area cf the perlite sacking and weighing operation contained 3.4 million particles per cubic foot of air. Sample Ho. 2 taken in the area of the mixer for Zonolite acoustical materiel contained 5.2 million particles per cubic Loot .b.fhair.-: - --- - -- -^-zon 61 i'te^acctis t nlterlala per cubic foot o air. v3igh-rhg"6pcratToh fc 8.4 million particles The dust in the area of the Perlite seeking operation (Sample Ko. 1) is primarily made up of a micaceous material which has cm accepted Threshold Limit of 20 r.ppcf (million particles per cubic foot). The dust count in this area was 3.4 mppcf and therefore at the time, and under ths conditions which the sample was taken, there does not appear to be a - health hazard. The cust in the area of the Zonolite mixing and sacking opera tions contains about 20% asbestos in a mixture of bentonite and micaceous material. The Threshold Limit for tills mixture of dusts, on the basis of 5 eppef for asbestos and 20 nppcf