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WASTE DISCHARGE REQUIREMENTS 3 UNIVERSITY OF CALIFORNIA LAWRENCE LIVERMORE NATIONAL LABORATORY EXPERIMENTAL TEST SITE AND U.S. DEPARTMENT OF ENERGY ALAMEDA AND SAN JOAQUIN COUNTIES 40 grams of 64 percent granulated chlorine is added to each tower every other week. NALCO 2896 contains phosphonate, sodium hydroxide, arcy lamide/acry late polymer and a substituted traizole. Other equivalent treatments may be applied. 9. Currently, NALCO 2593, a biocide, is added to Tower B-865. This product contains substituted isothiazolinone and 0.25 gallon is added twice a week. At the present level of operation, the highest concentration of NALCO 2593 in the blowdown is approximately 17 ppm. Other equivalent treatments may be applied. 10. The Discharger ran a 96 -hour fish bioassay on the fathead minnow at 75 percent and 100 percent solution with a result of zero fish kills. The test using 100 percent solution was done using blowdown water with only residual biocide. The Discharger had run out of biocide before the sample was taken. The Discharger will run another 100 percent solution fish bioassay with the normal amount of added biocide. 11. The Discharger analyzed blowdown water from Tower B-865 for general minerals. The analytes tested either do not have any identified water quality goals, or the results were well below water quality goals identified in the Board's Staff Report, A Compilation of Water Quality Goals. Attachment D lists the results of these analyses. 12. The pH of the cooling tower discharge is elevated above the range identified in the Basin Plan (6.5 to 8.5) for surface waters. The range of pH from the cooling towers sampled in 1993 was from a high of 9.86 at Tower B-851-2 to a low of 8.04 from Tower B-851-1. Measurements taken between 20 yards and 750 yards downstream of the discharge fluctuate, reaching a low of 8.09, 150 yards downstream; a high of 9.22, 350 yards downstream; and a final pH of 8.51, 750 yards downstream. Storm water runoff pH ranges from 8.3 to 9.0 at Site 300. The typical pH of the ground water supplying the cooling towers ranges from a pH of 8.1 to 8.7. During the dry season, water from the cooling towers percolates into the ground and never discharges offsite to Corral Hollow Creek. During the wet season, the contribution of the cooling tower blowdown to the total runoff to the receiving water is negligible. 13. Ground water below the site is currently used as a water supply for the cooling towers. The high mineral content of the ground water directly affects the volume and pH of the blowdown from the cooling towers. Site 300 has applied to the Department of Health Services for a permit to use water from the Hetch Hetchy water supply. The U.S. Department of Energy and the San Francisco Water Department are negotiating an agreement which will define the terms on which Site 300 receives Hetch Hetchy water. The change in water supply will reduce cooling tower water consumption because Hetch Hetchy water has a much lower TDS, which will allow