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JW Enterprises <br />50 Schooner Hill <br />Oakland, CA 94618 <br />(415)841-4905 <br />November 19, 1988 <br />Mr. Dan Maglionico, P.E. <br />Eljumaily and Butler Associates <br />P.O. Box 593 <br />Orangevale,CA 95662 <br />Subject: Asbestos Air Sampling at Forward Inc. Landfill, Stockton <br />Dear Mr. Maglionico: <br />This letter reports on the airborne asbestos sampling conducted <br />by JW Enterprises and Eljumaily and Butler at the Forward Inc. <br />landfill, Stockton, California, on October 21, 1988. At that <br />time, eight ambient air samples were collected at four locations <br />in close proximity to the active face of the landfill. Sampling <br />was performed using four Mine Safety Appliance medium -volume <br />pumps calibrated to two liters per minute sampling rate. The <br />sampling media were 25 millimeter mixed ester membrane millipore <br />filters, with 0.8 to 1.2 micron pore size. These were contained <br />in special cartridges, with filter supports, and connected to the <br />pumps by tygon tubing and plastic adapters. Each pump was <br />operated for two hours each for two consecutive sampling periods. <br />Two samples were collected at each location. The sampler <br />locations were to the north, west, south, and east of the working <br />face, with the south sampler being located within approximately <br />50 feet of the asbestos disposal area, and the other samplers <br />located within 100 feet of the working face of the disposal area. <br />The surface winds were approximately 4 to 7 miles per hour from <br />the northwest during the sampling period. <br />Samples were submitted to the TMA Norcal Laboratory located in <br />Richmond, California. TMA is an accredited laboratory for <br />asbestos testing. Samples were analyzed by NIOSH method 7400, <br />Phase Contrast Microscopy. The asbestos fiber count for this <br />sampling event ranged from less than 2600 fibers per filter to <br />one reading of 3100 fibers per filter. The laboratory report is <br />attached to this letter report. When air flows are included, <br />these values represent a range of less than 0.0108 fibers per <br />cubic centimeter to a single high value of 0.0129 fibers per <br />