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Building 850 Septic System Closure Plan 2 11 August 2009 Lawrence Livermore National Laboratory Site 300 " San Joaquin County Building 850, operations involving the use of metals may have caused undocumented discharges of metals to the septic system. 2. Sample and analyze groundwater from upgradient monitoring well NC7-44 and downgradient monitoring well NC7-10 according to Table 2 below. 3. Within two months of conducting the sampling of soil and groundwater, submit sampling and analytical results to the Central Valley Water Board. 4. Propose completing a feasibility study to remediate the soil and/or groundwater within 60 days of reporting the results of the required monitoring if the analyses indicate that beneficial uses of groundwater are impacted or threatened to be impacted. Table 1:Building 850 se tics stem soil analytical methods and repo inlimits Analyte EPA (E) or Reporting Units Standard Method SM limit Aluminum E6010B or E6020 1 m /L Antimony E6010B or E6020 0.06 m /L Arsenic E6010B or E6020 0.05 m /L Barium E6010B or E6020 0.5 m /L Beryllium E6010B or E6020 0.04 m /L Boron E6010B or E6020 0.5 m /L Cadmium _ E6010B or E6020 0.05 m /L Chromium E6010B or E6020 0.5 m /L Chromium VI E218.6, E7196 or E200.8 0.05 m /L Cobalt E6010B or E6020 0.5 m /L Copper E6010B or E6020 0.5 m /L Iron E6010B or E6020 0.5 mg//L Lead E6010B or E6020 0.5 m /L Magnesium E6010B or E6020 0.5 mg/ L Manganese E6010B or E6020 0.05 m /L Mercury E6010B or E6020 0.005 m /L Molybdenum E6010B or E6020 0.5 m /L _Nickel _ E6010B or E6020 _ 0.5 mL Potassium E6010B or E6020 1 m /L Selenium E6010B or E6020 0.05 m /L Silver E6010B or E6020 0.5 m /L Thallium E6010B or E6020 0.02 m /L Vanadium E6010B or E6020 0.5 m /L Zinc JE6010B or E6020 0.5 m /L Or equivalent method as approved by the Central Valley Water Board.