Document 8VJ9epydRqVLZ40V38e4GjVZB

NATLSCO National Loss Control Service Corporation Long Grove, IL 60049 3121540-2488 ENVIRONMENTAL SCIENCES LABORATORY, A-1 HZALTH. SAFETY ' ' iu/u Kk=.'J.iVQ. LABORATORY ANALYSIS REPORT TO: THOMAS SHAFFER certainTeed corporation P.0. BOX 860 VALLEY FORGE, PA 19482 f "isubsldlaiyof /HC\ n vA. rcizmPER coRPORanm REPORT DATE.- SEPT. 25, 1979 SAMPLES REC'D: SEPT. 19, 1979 REQUEST NUMBER: 16585 SAMPLE NUMBER ANALYSIS REQUESTED 9/17/79 BULK SILICA (PRES SucI\) % SiOZ,,. 100 RESULTS COMMENTS: METHOD: X-RAY DIFFRACTION RESPECTFULLY SUBMITTED, Jt^AN A. WRONSKI, MANAGER ENVIRONMENTAL SCIENCES LABORATORY ACCREDITED BY THE AMERICAN INDUSTRIAL HYGIENE ASSOCIATION NC137A 6-78 SM PLAINTIFF'S EXHIBIT CT-658 PRINTED IN U.S.A. CTD027241 r JOJlinv .. ,337-5 /(<'/. $ / CTD027242 CertainTeed Corporation P.O. Box 860 Valley Forge, PA 19482 (215) 687-5000 Certairileed September 17, 1979 Ms. Joan A. Wronski, Director National Loss Control Service Corporation Environmental Sciences Laboratory Long Grove, ILL 60049 Dear Ms. Wronski: Please analyze the enclosed bulk silica sand sample for percent quartz, percent cristobalite, and percent tridymite. Please call me if you have any questions. Thank you. S' Thomas C. Shaffer ' Corporate Industrial Hygienist TCS/ejb Enclosure CTD027243 1125