SILICA, CRYSTALLINE, by XRD (filter redeposition) 7500 SiO2 MW: 60.08 CAS: 14808-60-7 (quartz) RTECS: VV7330000 (quartz) 14464-46-1 (cristobalite) VV7325000 (cristobalite) 15468-32-3 (tridymite) VV7335000 (tridymite) METHOD: 7500, Issue 4 EVALUATION: FULL Issue 1: 15 August 1990 Issue 4: 15 March 2003 OSHA : NIOSH: ACGIH: quartz (respirable) 10 mg/m3/(%SiO2+2); cristobalite and tridymite (respirable) % the above 0.05 mg/m3 carcinogen quartz (respirable) 0.1 mg/m3 cristobalite (respirable) 0.05 mg/m3 tridymite (respirable) 0.05 mg/m3 PROPERTIES: solid; d 2.65 g/cm3 @ 0 C; crystalline transformations: quartz to tridymite @ 867 C; tridymite to cristobalite @ 1470 C; a-quartz to U-quartz @ 573 C SYNONYMS: free crystalline silica; silicon dioxide SAMPLING SAMPLER: FLOW RATE: VOL-MIN: -MAX: SHIPMENT: SAMPLE STABILITY: BLANKS: BULK SAMPLE: CYCLONE + FILTER (10-mm nylon cyclone, HigginsDewell (HD) cyclone, or aluminum cyclone + 5-Mm PVC membrane) *see sampling section Nylon cyclone: 1.7 L/min; HD cyclone: 2.2 L/min; aluminum cyclone: 2.5 L/min 400 L 1000 L Routine Stable 2 to 10 per set (see step 13.g.)

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notala Aluminum Araenic Boron cadmium Chromium Cobalt Copper Iron Lead Mercury Nickel silver Zinc Nitrate Chloride Fluoride Total Organic Carbon Total Phosphorue Organochlorine Pesticides Toxaphene Organophosphorus Pesticides Dhthoate TEPP Uonocrotophos 0.1 0.01 0.5 0.0002 0.01 0.03 0.005 0.03 0.005 0.0003 0.03 0.02 0.02 0.05 1 0.1 1 0.03 0.5 2 0.5 2.0 2.0 2.0 0.5 ND' ND ND ND ND ND ND 0.03 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND Notear 3" 1.

VAB.0001189784 SAfEii - Continued Routine dosimetry results for the month were: Chemical <_________________________ Number ;> PEL Number Percent VCM Lead Total Particulates 70 98.6 1 6 100.0 0 6 100.0 0 The single VCM overexposure was with benefit of a respirator.

Gnter for Enwonmend Toucolog & Technology Dcpamnent of Enwonmental Health,Colorado State Umvemty, Fort Cob, CO 80523 Varhb@kyinBiologicalExposure IndicesUdngPhysblogicallyBased PhatmacokheticModelingand Monte Carlo Simulation / By using physiologically based pharmacokinetic (PBPK) modeling coupled with Monte Carlo simulation,the interindividualvariability in the concentrationsof chemicals in a worker's exhaled breath and urine were estimated and compared with existing biological exposure indices (BEls).The PBPK model simulated an exposure regimen similar to a typical workday, while exposure concetltrations were set to equal the ambient threshold limit values (TLV"s) of six industrial solvents (benzene, chloroform,carbon tetrachloride, methylene chloride, methyl chloroform, and trichloroethylene).Based on model predictions incorporating interindividual Tvariability, the perc tage of population protected was derived usingTLVs as the basis for worker protectionb. esults showed that current BEls may not protect the majority or all of the --workers ir; an oc@pational setting.For instance, current end-expired air indices for benzene and methyl chloroform protect 95% and less than 10% of the worker population, respectively.

The annual incidence of HAS by date of diagnosis and geographic location for four leading countries is shown in Figure 2.

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Fiber Burden and Patterns of Asbestos-related Disease in Chrysotile Miners and Millers ANDREW CHURC, JOANNE L.

| @HAZLETON WASHINGTON AR226-0%5] GENOTOXICITY TEST ON T-5710.1 IN THE IN VIVO/IN VITRO UNSCHEDULED DNA SYNTHESIS AND CELL PROLIFERATION IN RAT LIVER CELLS [EINAL REPORT AUTHOR Maria A.

0 TO: Interoffice Communication FROM: DATE: SUBJ: Distribution TGG: JCL ERT: MJH: AJO: T.

G Total METAL LESS THAN or ACTUAL Arsenic Barium Cadmium Chromium Lead Mercury Selenium (Parte Par Million) a< 5 < 500 E< ioo H< 1 0< 100 H< 5 B< 5 < 500 0< 0.2 < 20 0< 1 Q< 10U Silver E< Chromium-Hex E< Copper Nickel E< (3< Thallium H< n<Zinc E< 5 5 < 500 5 5 0< 134 5 n< inn 5 n< < Steal of 2 TURN PAGE AND COMPLETE SIDE 2 Form CWV '-000 e 1987 Chemical Waste Management, Inc. . 022252 GENERATOR'S WASTE MATERIAL PROFILE SHEET (Continued) g~l K 37932 Waste Proflte Stoat Coda Q.

The soloent action of these liquids on other materials of construction may lead to increased dielectric toss which can be eliminated by the use of actleated alumina as Illustrated.

EnTvironmental Health Perspectives Supplements 101 (Suppl. 6): 161-167 (1993) A Brief Survey of Butadiene Health Effects: A Role for Metabolic Differences by Linda S.

7//^ DRAFT 8/8/91 PRIVILEGED AND CONFIDENTIAL Environmental Protection Agency Office of Toxic Substances Docket Control No.