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i <br /> t <br /> t p <br /> ` v;... <br /> AIL WA,STECH NOL(JGIES <br /> July 7, 1989 <br /> Mr. Gregory Basso <br /> Forward Inc. <br /> P.O. Box 6446 <br /> Stockton, CA <br /> Re: Asbestos Air Sampling at Forward Inc. Landfill <br /> EBA Job No. 87-108, Task 2 <br /> Dear Mr. Basso: <br /> This letter reports on the airborne asbestos sampling conducted by Eljumaily Butler at the <br /> Forward Inc. Landfill, Stockton, California on March 23, 1989. Eight samples were <br /> collected at four different locations surrounding the asbestos disposal area of the landfill. <br /> The pumps used were four Mine Safety Appliance medium volume pumps calibrated to <br /> a pumping rate of two liters per minute using a precision rotameter. On the pumps were <br /> sections of Tygon tubing with an attached 25 millimeter mixed ester membrane millipore <br /> filter with 0.8 to 1.2 micron pore size. Each filter was protected in special cartridges which <br /> attached to the pump with plastic adapters and tubing. <br /> The pumps were operated continuously for two hours for each of two sampling periods. <br /> The air samples were collected at locations north, south, east and west of the asbestos <br /> disposal area, all within approximately 50 feet of the working face. The winds were light <br /> and westerly during the sampling period. <br /> The samples were submitted on March 23 to the TMA/Norcal Laboratory Richmond, CA, <br /> an accredited laboratory for asbestos testing, and analyzed by NIOSH method 7400, <br /> Phase Contrast Microscopy. The results of the first testing period, beginning at 11:00 am, <br /> indicates; that all the filters contained less than 2800 fibers per filter, which essentially <br /> represents no asbestos detected. The second testing period, beginning at 1:15 pm, <br /> found no detected asbestos in the cartridge along the western boundary of the working <br /> face. The highest fiber count of the remaining three cartridges shows 4100 fibers per <br /> filter, which equates to 0.01708 fibers per cubic centimeter of air. The standard for an <br /> eight hour worker exposure without threat to health or safety is 0.20 fibers per cubic <br /> 825 Sonoma Ave., Suite C Post Office 4600 Santa Rosa,California 95402 (707) 544-0784 FAX (707) 544-0866 <br /> Also Auburn,California and Las Vegas, Nevada <br />