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r� <br />KLEINFELDER <br />fibers in excess of 10 microns are counted), therefore, TEM is proposed as the method of <br />analysis because fiber size distributions are more accurately estimated. The specific TEM <br />method used for the 1991 surface water samples was in accordance with the EPA document <br />"Interim Method for Determination of Asbestos in Bulk Insulation Samples", EPA 600/M4- <br />020, December 1992. <br />6.5.1.4 Frequency and Duration of Monitoring <br />Monitoring has been broken into phases that correspond to the phases of construction. <br />Phase I Monitoring: <br />After remediation of surface soil and cap construction, Phase I drainage monitoring will begin. <br />We anticipate that a temporary elevation of asbestos in runoff may be observed due to soil <br />® disturbance caused by grading activities. For this reason, we propose a higher frequency of <br />C <br />monitoring than after later phases of construction. <br />Runoff and channel surface water samples will be collected over the period of one wet season. <br />The samples will be collected during the first four significant storms of the wet season. A <br />significant storm is defined as an event of sufficient intensity to cause discharge of runoff from <br />the 7-M Mfg. property into the channel bisecting the site. Samples will be collected of both <br />runoff and surface water at the sampling points discussed previously. <br />Phase II Monitoring: <br />Phase II monitoring will be similar to Phase I, except that the frequency will be scaled back <br />from four to two sampling events. Runoff samples will be collected during times that water is <br />discharged from the sedimentation basins. <br />Phase III Monitoring: <br />To assess the need for Phase III construction, surface water in the existing channel will be <br />monitored to assess the need for Phase III construction, under the assumption that the presence <br />of asbestos in site runoff has been controlled. Two samples will be collected during the first <br />two storm events that cause water to flow in the channel. <br />CR14-92-12 Page 36 of 39 24-220109-1709 <br />Copyright 1992 Kleinfelder, inc. <br />