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131 LA UR 03 5862 - National Nuclear Security Administration ...

131 LA UR 03 5862 - National Nuclear Security Administration ...

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Figure 4-7. Emissions of sulfur oxides.Hazardous AirPollutantsVolatile OrganicCompoundsFigure 4-8. Emissions of volatile organic compounds and hazardous air pollutants.4.2 Surface Water QualityThe number of permitted outfalls at <strong>LA</strong>NL has decreased from 88 at the end of 1996 to 21 in 2002(Appendix D). As a result of these closures, there has been an overall 44 percent decrease in flow over 1999levels. Currently flow is about 64 percent of the level projected by the SWEIS. There was considerableuncertainty in both the SWEIS estimates and in the pre-2001 annual outfall volume estimates, when <strong>LA</strong>NLbegan to measure rather than estimate flows. All of the watersheds at <strong>LA</strong>NL, however, have had a decline inoutfall volume to some degree since 1999, in part due to outfall closures. Discharges into Mortandad Canyonhave decreased about 20 percent (7.9 million gallons per year) since 1999; outfall discharges into WaterCanyon have decreased about 99 percent (about 12.9 million gallons per year) since 1999; Sandia Canyonoutfall discharges have decreased by about half (105 million gallons per year) since 1999; and Los AlamosCanyon discharges have declined about 19 percent (about 8.4 million gallons per year) since 1999. In somewatersheds, increased runoff resulting from the Cerro Grande Fire has produced greater than normal flowsdespite the closure of outfalls.SWEIS Yearbook—2002 4-5

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