ON HYGIENE - LEAD ALKYLS AREA September 15, 1966 1.

In head-to-head leaching studies in California) plastic pipe (CPVC) is safer for drinking water than aetal pipe (copper with tin-lead solder).

ANSWER: We have no evidence to support the belief that there have been sufficiently high levels of PCB in Escambia Bay which would lead to depletion of the shrimp population there. -0O0(NOTE TO THE INQUIRY REPLIER: At this point you may want to refer the reporter to Dr.

The country's leading expert on as causing fibers in the air around con-^ bestos, ML Snaps Dr.

TRACEY OLD HICKORY 333 ASBESTOS DUST ANALYSIS In aid-1968 we fallowed Coiutructloo Division's lead in adopting an asbestos dust level goal of 0.5 Billion particles per cubic feet (MPPCf).

HB 40 Bis(4-chlorobutyl) adipate ' Bis(4-chlorobutyl) phthalate ` DSW 588398 STLCOPCB4093734 2-02-760.01-0455127 (2) Page Two PLAS-55 The general formulation used was: PHR Thiokol LP-32 100 \ c Plasticizer H 15 and 40 vf M CD Non-coated CaC03 40 JPh -wP Lead Dioxide >5 1--l Stearic Acid c3 -OoP3 Sl60 or S-902 50 /\i 5 45 J Sulfur Formulation 100 15 0.1 The following points may be emphasized: 1.

Poten tially this practice could lead to complaints similar to those investigated in 0-22 dept. 2.

The Rhode Island group will analyze atmospheric samples for lead, copper, iron, aluminum, and other metals.

Thisis the type of data that leads some authorities to urge strict controls over tolidine and dichlorobenzidine. 5.

Asbestosis can lead to cancer in the lower lobes of the lung.

Hamilton in the lead trades to the stringent control of beryllium hasard in modern industry attest to the W~AXPttlNTAVAlLX~BLg rfcblft>bbs;P%Tib_*_i'_if_P_O_X__R_E_Q_U_E_S_T' ""C^h.r.o.7nic. tPLn.eVu-m---o--n-i7tis.

This leads to a coat savings of approxi mately $2/ton.

1317 b Approximate milligrams of particulate per cubic meter of air * As sampled by method that does not collect vapors h According to analytically determined com* position 1 For control of general room air, biologic monitoung is essential for personnel control * 1968 Revision 1968 Addition Substance 4 Asbestos 12 fibers/mt > 5/i in length1' , or 2 mppef*' * Cnstobalite Use one-halt the value calcu lated from the count or mass formulae for quartz * Quartz (1) TLV for respirable dust in mg/rrr* 10 mg/cu mm Per cent Respirable Quartz + 2 (2) Total dust respirable and non respirable 30 mg/cu m Per cent Quartz + 2 * Tridymite Use one-half the value calcu lated from formulae for quartz 1 As determined b> the membrane filter method at 430 g-phase contrast magnification k As counted b> the standard nnpinger, light field count technique " Both concentration and per cent quartz for the application of this limit are to be determined from the fraction passing a si7e-sdcctor with the following characteristics Aerodynamic Diameter-/* (unit density sphere) *2 25 35 $0 10 Per cent passing selector 90 75 50 25 0 * 1968 Revision Appendix A A' Benzidine Because of high incidence of bladder tumors in man, any exposure, including skin, is extremely hazardous A3 /3-Naphthylamine Because of the ex tremely high incidence of bladder tu mors in workers handling this compound and the inability to control exposures 0-naphthylamine has been prohibited by the State of Pennsylvania from manu facture, use and other activities that in volve human contact A9 N-Nitrosodimethylamine Because of extremely high toxicity and presumed carcinogenic potential ofthiscompound, contact by any route should not be per mitted A* Polytetrafluoroethylene decomposi tion products Thermal decomposition of the fluorocarbon chain in air leads to the formation of oxidized products con taining carbon, fluorine and oxygen Because these products decompose in part by hydrolysis in alkaline solution, they can be quantitatively determined in air as fluonde to provide an index of exposure No TLV is lecommended pending determination of the toxicity of the products, hut air concentrations should he minimal A9 fi Propiolactone Because of high acute toxicity and demonstrated skin tumor production in animals, contact by any route should be avoided A Gasoline and/or Petroleum Distillates The composition of these materials varies greatly and thus a single TLV for all types of these materials is no longer applicable In general, the aromatic hydrocarbon content will determine what TLV applies Consequently the content of benzene, othei aromatics and additives should be determined to airive at the appropriate TLV (Elkins, etal A I HAJ 24,99,1963) * trade Names Algoflon, Fluon.

When nonoccupational disorders lead to work disability, 96.7% of the respondent medical directors maintain contact with the employee's physician.

The fluid dost have good solvent properties and oan lead to tha drying of tha skin and subsequent cracking if there la prolonged or repeated exposure, the fluid acts nxtoh like eemami paint removers or thinner* in this resoeot.