Walling DU PONT CHEMICALS - CRG DATE: July 30, 1993 PROJECT MR 9682 PART I TITLE: In Vitro' Method to Simulate Gastric Bioavailability of Lead Contaminated Soil Authority is requested to undertake the study identified above and described as follows: To conduct in vitro experiment used to simulate gastric bioavailability of lead contaminated soil.

Schenck will also contact Jeff Zelms and Jim Stack at Doe Run to ask about highlighting Zelms1 keynote speech as a media hook and the issue of press availability for visits to the Doe Run lead mines, respectively.

Titled "10 Reasons to Rely on Vinyl, the World's Leading Electrical Material," the brochure reviews vinyl's 50-year record of demonstrated safety, versatility, good economics and dependability as well as its integration into the solid waste management process.

Schenck will also contact Jeff Zelms and Jim Stack at Doe Run to ask about highlighting Zelms' keynote speech as a media hook and the issue of press availability for visits to the Doe Run lead mines, respectively.

DU PONT CENTRAL RESEARCH AND DEVELOPMENT HASKELL LABORATORY FOR TOXICOLOGY AND INDUSTRIAL MEDICINE TO: TIMOTHY BINGMAN DUPONT CHEMICALS AND SPECIALTIES REO-PIT DATE: OCTOBER 4, 1993 PROJECT MR 9727 PART I TITLE: ABSOLUTE BIOAVAILABILITY OF LEAD SOIL IN MICROSWINE SOILS AEC 3-3, 9-3, AND 10-1 Authority is requested to undertake the study identified above and described as follows: To conduct a study in microswine to determine the absolute bioavailability of soil lead.

The following chemicals, pertinent to Vista, are on the list: benzene, cadmium and compounds, carbon tetrachloride, lead and lead compounds, and xylenes.

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Box 21926 Seattle Washington 98111-3926 1 Kaiser Gypsum objects to this interrogatory on the grounds that it is vague ambiguous and 2 overbroad as it contains years when Kaiser Gypsum was not doing business and thus it is not reasonably calculated to lead to the discovery of admissible evidence Without waiving said objections !

Box 21926 Scattle Washington 98111-3926 206 628-6600 Kaiser Gypsum objects to this interrogatory on the grounds that it is vague ambiguous and 2 overbroad as it contains years when Kaiser Gypsum was not doing business and thus it is not 3 reasonably calculated to lead to the discovery of admissible evidence Without waiving said objections 4 Kaiser Gypsum responds S Kaiser Gypsum was organized and incorporated in 1952.

We are expediting Doe Run's entry into the lead recycling market.

Lavino & Company Lead Industries Association --M Mackintosh-Hemphill Company Macktin Company Magma Copper Company Maryland Self-Insurers' Association Mayer China Company I.

MDHS Methods for the Determination of Hazardous Substances Health and Safety Laboratory 81 Dustiness of powders and materials HSE Health & Safety Executive September 1996 INTRODUCTION 1 The control of dust emission during the production, handling and transportation of powders and materials is an important consideration in the design and operation of industrial processes. 2 Excessive airborne dust levels in workplaces are undesirable for a number of reasons: a) they can cause adverse health effects; b) their control can involve the use of costly ventilation and filtration systems; c) they can be costly in terms of lost product; d) they can contaminate machinery and products.

Cranial nerve dysfunction may cause severe bulbar paresis with difficulty in swallowing and aspiration leading to pneumonia.

We look forward to our continuing dialogue with CMA leading to the signing of an MOU to conduct research to address ATSDR's data needs for vinyl chloride.