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Accredited by U.S. Dept. of Commerce LKWU ASBESTOS TEM LABORATORIES, INC WLAP LAB CODE 101891-0 CA DOHS ELAP Jun/17/2010 Don Litchfield Del -Tech Geotechnical Support 645 N. Yosemite Ave Oakdale, CA 95361 RE: LABORATORY JOB # 1323-00001 Transmission electron microscopy analytical results for 5 air sample (s). Job Site: Job No.: Enclosed please find results for the TEM analysis of one or more air samples. The analytical procedures were performed according to the NIOSH 7402 (Revision # 1) method. Prior to analysis, samples are checked for damage and disruption of the chain -of -custody seal. Samples are then logged -in, each given a unique laboratory number, and a hard copy containing all pertinent information is generated. This, and all other relevant paper work are kept with each sample throughout the analytical procedures to assure proper analysis. Preparation of air filter cassettes is performed within a HEPA filtered, Class 100 air, laminar flow clean bench environment. Cassettes are wet -wiped to remove any external contamination prior to placement into the clean bench area. Sections of the filters are removed, placed onto glass microscope slides, and collapsed in acetone vapor. The collapsed filters are plasma etched, removing the surface of the filter to a depth of ten percent of its original thickness, then carbon coated. The filters are further sectioned and placed carbon side up onto 200 -mesh copper TEM sample grids in an acetone wick washer to remove filter material. The grids are placed into labeled containers and loaded into the microscope for analysis. TEM analysis is performed on a Philips EM -300 transmission electron microscope operating at 80 or 100 kV, with a magnification as indicated on the analytical report. A known area of the specimen surface is scanned for fibrous structures. All structures exhibiting an aspect ratio greater than or equal to 3 to 1, and a length greater than or equal to 5.0 um are subjected to detailed morphological and selected area diffraction (SAED) analysis. Structures indicated as asbestos, or potentially asbestos, are further analyzed by energy dispersive X-ray (EDX) analysis as needed. Analysis continues until 100 asbestiform structures are found, or an analytical sensitivity of 0.001 structures/cc is attained, or 40 grid openings are analyzed. Data is compiled into a standard report format and released to the client. Sincerely Yours, Laboratory Manager ASBESTOS TEM LABORATORIES, INC. --- These results relate only to the samples tested and must not bereproduced, except in full, with the approval of the laboratory. This report must not be used to claim product endorsement by NVLAP or any other agency of the U.S. Government. --- 630 BANCROFT WAY ® BERKELEY, CA 94710 • (510) 704-8930 • FAX (510) 704-8429 www.asbestostemlabs.com With Offices in Reno, NV (775) 359-3377