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LAWRENCE LIVERMORE NATIONAL LABORATORY -SITE 300 Hazardous Waste Facility EPA ID No. CA 2890090002 Post -Closure Permit Effective Date: April 3, 2003 Page 5 of 13 (g) In case of conflicts between the Operation Plan and the Permit, the Permit conditions take precedence. (h) This Permit includes and incorporates by reference any conditions of waste discharge requirements issued by the State Water Resources Control Board or any of the California Regional Water Quality Control Boards and any conditions imposed pursuant to section 13227 of the Water Code. 3. COMPLIANCE WITH CALIFORNIA ENVIRONMENTAL QUALITY ACT (CEQA) A Negative Declaration for this project has been prepared in the accordance with the requirements of Public Resources Code section 21000 et seq. and the CEQA Guidelines, CCR, title 14, section 15070 et seq. 4. ENVIRONMENTAL MONITORING a) The Permittee is required to continue to perform groundwater monitoring in accordance with the requirements of CCR, title 22, division 4.5, chapter 14, article 6 and as specified in Operation Plan. Figure 3 of this Permit shows goundwater monitoring well locations. Table 1 lists components of groundwater constituesnts of concern (CDCs), analytical methods, and concentration limits. Monitoring frequency shall be as follows: chemical analyses of groundwater of all COCs and measurement of groundwater elevations on a quarterly basis for the proposed new monitoring well and existing two monitoring wells, 829-15 and 829-22 for the first year of the post -closure period. After the second year, the frequency shall change to semi-annually for groundwater elevations and annual monitoring for all laboratory parameters and other field parameters if evaluation of the data justifies a longer time period between monitoring events. DTSC approval shall be required for any such change. Should the list of monitoring parameters be reduced in the future, the original list of monitoring parameters shall be analyzed every five years. DTSC approval shall be required for any such change. b) A visual inspection of the covered area shall be conducted, at a minimum, on a monthly basis. Additional inspections shall be performed after 25 year 24 hour rainstorms, and after a significant earthquake (see Part 4(d)), or other events which may cause substantial damage to the capped Facility. On a yearly basis, the Permittee shall conduct a comprehensive inspection as detailed in the Operation Plan. An independent engineer registered in California shall approve the evaluation. All inspections shall be conducted in accordance with Section 6.1, of the Operation Plan.