This should not lead to a raise sense of security, how ever, because the same medical conclusions on allowable exposure levels are applicable regardless of the industry where they occur.

TLVs Threshold Limit Values for Chemical Substances and Physical Agents .

Threshold Limit Values for Chemical Substances and Physical Agents in the Workroom Environment with Intended Changes for 1979 511904 0131 Copyright 1979 by American Conference of Govern mental Industrial Hygienists.

*V.

In this health area, the module leads OSHA.

fe>Hh/ &. pox TLVs Threshold Limit Values for Chemical Substances and Physical Agents in the Workroom Environment with Intended Changes for 1977 !

TLVs Threshold Limit Values for Chemical Substances and Physical Agents in the Workroom Environment with Intended Changes for 1978 !

To Frnm Tkodicti amd Chstuca/l PUT IT IN WRITING Date 28 April 1978 R- C.

PLAINTIFF'S EXHIBIT TLVs Threshold Limit Values for Chemical Substances and Physical Agents in the Workroom Environment with Intended Changes for 1977 v-'TVv-vjT" SC 162n LAM024913 Copyright 1977 by American Conference of Govern mental Industrial Hygienists.

& 2^ GrZC&G-E TLVs Threshold Limit Values for Chemical Substances and Physical Agents in the Workroom Environment with Intended Changes for 1977 C j?

FRIDAY, OCTOBER 5, 1973 WASHINGTON, D.C.

Vulcan Materials Company CHEMICALS DIVISION / P. 0.

Remarks: Lead Area At the present time, lead-in-air is monitored by air sampling equipment at various locations in the TEL-TML Areas.

Ethyl Corp. has applied this technique, with byproduct HC] used to pro duce ethyl Chloride for manufacture of tetraethyl lead antiknock compounds.

Ethyl Corp. has applied this technique, with byproduct HC1 used to pro duce ethyl chloride for manufacture of tetraethyl lead antiknock compounds.