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N <br />k JW Enterprises <br />50 Schooner Hill <br />Oakland, CA 94618 <br />(415)841-4905 <br />February 26, 1989 <br />Mr. Dan Maglionico, P.E. <br />Eljumaily and Butler Associates <br />P.G. Box 593 <br />Grangevale, CA 95662 <br />Subject: Asbestos Air Sampling at Forward Inc. Landfill, Stockton <br />Dear Mr. Maglioni co: <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 the two occasions of November <br />29, 1988 and Jan,Uary 26, 1989. At each of those tines, eight <br />ambient air samples were collected at four locations in close <br />proximity to the active face of the asbestos disposal area of the <br />landfill. Sampling was performed using four Mine Safety -- <br />Appliance medium -volume pumps calibrated to two liters per minute <br />sampling rate. The pumps were calibrated to the two -liter <br />sampling rate with a filter in place using a precision, rotameter. <br />The sampling media were 25 millimeter mixed ester membrane <br />millipore filters, with 0.8 to 1.2 micron pore size. These were <br />contained in special cartridges, with filter supports, and <br />connected to the pumps by tygon tubing and plastic adapters. <br />Each pump was operated for two hours each -for two ccrasecutive <br />sampling periods. Two samples were collected at each locution on <br />each sampling date. The sampler locations were to the north, <br />west, south, and east of the working face, with all samplers <br />being located within 100 feet of the asbestos disposal area 011 <br />each sampling occasion. The surface winds were light to moderate <br />northwesterly on both sampling days. <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 counts for all <br />samples for both sampling events were reported as less than 2800 <br />fibers per filter. Laboratory results reporting less than 2800 <br />fibers per filter essentially represent no asbestos detected. <br />