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LI ' r� After closure of the WMUs and remediation of contaminated soil areas, monitoring of the site is necessary to assess both the short-term and long-term effectiveness of the closure. 6.5.1 Surface Water Monitoring for asbestos in storm water runoff and in surface water is considered the most important part of the monitoring program. A monitoring program is proposed that samples for asbestos in storm water runoff, in the canal surface water (both up and downgradient) and at a downstream off-site location. Elements of this monitoring program are as follows: 6.5.1.1 Storm Water Runoff Water samples will be collected at points where storm water runoff is discharged to the channel that crosses the J -M Mfg. property. Plate 6-1 indicates these discharge points for drainage from the WMUs. Runoff from the manufacturing area will also be sampled at the point(s) where it enters the channel. 6.5.1.2 Surface Water Three of the 1991 surface water monitoring points (SW -1, SW -3, SW -4) shown on Drawing 2 will be used to monitor the background and downstream quality of surface water. SW -1 is an off-site upstream location that will be used to measure background values. SW -3 is located at the point where the channel exits the J -M Mfg. property, and it will be the point for measuring surface .water impacts immediately downgradient of the property. In a letter dated January 16, 1992, the CVRWQCB stated that in addition to remediation of on-site asbestos problems, off-site discharges of asbestos must also be addressed. Surface water sampling point SW -4 is included for this purpose. It is located approximately 700 feet downstream of the J -M Mfg. property just before the channel is intercepted by lateral channels that drain areas to the north and the south. 6.5.1.3 Method of Analysis Both PLM and TEM have been used to measure asbestos fibers in water and soil samples collected at the J -M site. The proposed water quality goal of 7 MFL has a size qualifier ( only CR14-92-12 Page 35 of 39 24-220109-F09 Copyright 1992 Kleinfelder, Inc.