COMPLIANCE INFO_1992 - Laserfiche WebLink

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KLEINFELDER ■ Upgradient drainage volumes that would have to be carried by a pipe replacing the ■f channel. ■ Feasibility of installing the pipe in light of potential concerns/requirements that may be imposed by F&G or the COE. Rather than specify one plan that may ultimately prove to be infeasible or contain unnecessary measures, a phased plan was prepared where development of the facility drainage system will be related to the effectiveness of the previous phase. Regardless of how stringently the site is remediated, there will most likely be some residual level of asbestos fibers in the runoff or in the channel waters when they leave the site. It would be unreasonable to require a zero discharge since the most recent upgradient monitoring found asbestos fibers at a concentration of 165 million fibers per liter (SW -1). The February, 1991 compilation of water quality goals prepared by the CVRWQCB lists two surface water quality goals for asbestos. The first is an EPA primary maximum contaminant limit (MCL) of 7 million fibers per liter (MFL) for fibers greater than 10 microns in length. The second standard listed is a one -in -a -million cancer risk estimate of 30,000 fibers per liter (from the EPA National Ambient Water Quality Criteria). There is a large difference in the standards and it does not appear that both could be used as water quality goals at the same time. Another EPA document "Drinking Water Criteria Document For Asbestos, March, 1985" contains a section on the presence of asbestos in drinking water supplies and food products. A study of the water supply in San Francisco (originating from Lake Crystal Reservoir) was discussed. It was found that a total of 34 finished (treated water ready for human consumption) water samples were found to contain > 1 MFL. Fifty percent of those samples had asbestos in excess of 10 MFL. In another study presented in the 1985 EPA report, asbestos concentration in over 1500 water samples from 406 cities in 47 states were assessed. The authors found that 18% of the samples had asbestos concentrations in excess of 1 MFL. 10% of the samples had asbestos concentrations in excess of 10 MFL. Food products were also found to contain high levels of asbestos fibers. The following was taken from Table IV -II in the 1985 EPA report: CR14-92-12 Page 32 of 39 24-220109-809 Copyright 1992 KLeinfetder, Inc.