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California Regional Water Quality Control Board w Ur��-s I� �� Central Valley Region Karl E.Longley,SCD,P.E.,Chair k"'`' Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Arnold Secretary for Phone(916)464-3291 •FAX(916)464-4645 Schwarzenegger Environmental http://www.waterboards.ca.gov/centralvalley Governor Protection 1 October 2009 RECEIVED O C T 0 6 2009 Ms. C. Susi Jackson Environmental Protection Department ENVIRONMENTAL HEALTH Lawrence Livermore National Security, LLC DEPARTMENT P.O. Box 808 L-626 Livermore, CA 94551-0808 UPDATED LOW THREAT DISCHARGE INFORMATION, WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0148, LAWRENCE LIVERMORE NATIONAL LABORATORY EXPERIMENTAL TEST SITE, SITE 300, LAWRENCE LIVERMORE NATIONAL SECURITY LLC, SAN JOAQUIN COUNTY California Regional Water Quality Control Board, Central Valley Region (Central Valley Water Board) staff has reviewed the July 2009 Updated Low Threat Discharge Information and Report of Waste Discharge. The updated discharge information describes proposed waste water discharges from the Hetch-Hetchy water system to be beneficially reused as evaporation make-up water in the sewage evaporation ponds and for dust control both on-site and at the Carnegie State Vehicular Recreation Area (Carnegie SVRA). Waste Discharge Requirements Order No. R5-2008-0148 (Order) permits low threat discharges to the sewage ponds. On 23 September 2009, the Central Valley Water Board approved the short term discharge of waste water from the Hetch-Hetchy water system as dust control under Resolution No. R5-2008-0182 Approving the Waiver of Reports of Waste Discharge and Waste Discharge Requirements for Specific Types of Discharge within the Central Valley Region (Waiver). During the dry season (about mid March through mid November), Lawrence Livermore National Laboratory (LLNL) adds approximately 10,000 gallons per day of drinking water to the sewage evaporation pond to maintain proper treatment parameters. Carnegie SURA estimates that they use approximately 30,000 gallons per day of non-potable water from their well system for dust control during the dry season. Using the low threat water generated from the activities associated with preparing the water line to receive water from the Hetch-Hetchy system will reduce the amount of well water required for operations at both Site 300 and the Carnegie SVRA. Lawrence Livermore National Laboratory Site 300 will be changing the primary source of its potable water system from on-site groundwater to the Hetch-Hetchy Water System, currently scheduled to occur by April 2010. Sixteen years ago, LLNL installed 10-inch PVC pipeline approximately one and one-half miles long to receive Hetch-Hetchy system water from the Thomas Shaft, located south of the site. In order to prepare the pipeline for connection to the LLNL Site 300 potable water distribution system, LLNL plans to complete actions 1 — 5 listed California Environmental Protection Agency ��Recycled Paper