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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0148 -24- LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND THE U.S. DEPARTMENT OF ENERGY FOR LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 SAN JOAQUIN AND ALAMEDA COUNTIES D. GROUNDWATER LIMITATIONS The discharge shall not cause underlying groundwater to: 1. Contain waste constituents in concentrations statistically greater than background water quality. If background quality has been degraded in the past, the discharges covered in this Order shall not further degrade groundwater. Groundwater background quality varies across the site and among the various stratigraphic units. The methods for determining background are described in the MRP 2. Contain chemicals, metals, or trace elements in concentrations that adversely affect beneficial uses or exceed MCLs specified in 22 CCR, Division 4, Chapter 15. If MCLs are exceeded due to natural background or degradation from past discharges, the discharges covered in this Order shall not further degrade groundwater. 3. Exceed a most probable number of fecal coliform organisms of 2.2/100 ml over two consecutive quarters. 4. Exceed concentrations of radionuclides specified in 22 CCR, Division 4, Chapter 15. 5. Contain taste or odor-producing substances in concentrations that cause nuisance or adversely affect beneficial uses. 6. Groundwater shall not be impacted with nitrate so that the concentrations are greater than the MCL or background water quality when background concentrations exceed the MCL. Where groundwater is already degraded with nitrate from past discharges, the discharges covered in this Order shall not further degrade groundwater. E. PROVISIONS 1. The Discharger shall notify the Regional Board 30 days prior to installing or enlarging septic systems or percolation pits to receive domestic wastewater, mechanical equipment wastewater, or cooling tower blowdown discharges. If the installation or enlargement of a septic system or percolation pit is to accommodate a new discharge location or a change in discharge water quality or quantity, the Discharger must submit a new report of waste discharge (RWD) which includes an evaluation of any potential impact to groundwater quality posed by the waste stream. The new discharge shall not occur until this Order is revised in response to the RWD.