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Revised Monitoring and Rt-,,rting Program No. 93-100 7 Lawrence Livermore National Laboratory Site 300— Pit 1 San Joaquin County Table 3 (continued): Pit 1 Constituents of Concern, Detection Monitoring Wells, Statistical Methods, Concentration Limits, and Statistical Limits Constituent Detection Statistical Method Concentration Statistical of Concern Monitoring Limit' Limit Wells Uranium K1-02B Intrawell Prediction Limit 1.83 2.43 (total) K1-04 Intrawell Prediction Limit 0.97 1.51 K1-05 Intrawell Prediction Limit 1.55 2.13 K 1-08 Intrawell Prediction Limit 1.96 2.61 K1-09 Intrawell Prediction Limit 1.93 2.40 W-PIT1-2326 Intrawell Prediction Limit 1.67 2.06 Thorium-228 K1-02B Intrawell Prediction Limit 0.016 0.076 K1-04 Intrawell Prediction Limit 0.011 0.133 K1-05 Intrawell Prediction Limit 0.015 0.086 K 1-08 Intrawell Prediction Limit 0.025 0.098 K1-09 Intrawell Prediction Limit 0.011 0.222 W-PIT1-2326 Intrawell Prediction Limit 0.009 0.090 Thorium-232 K1-02B Intrawell Prediction Limit 0.012 0.121 K1-04 Intrawell Prediction Limit 0.006 0.037 K1-05 Intrawell Prediction Limit 0.014 0.109 K 1-08 Intrawell Prediction Limit 0.014 0.116 K1-09 Intrawell Prediction Limit 0.005 0.049 W-Pitt-2326 Intrawell Prediction Limit -0.0022 0.039 Salts/Anions Perchlorate K1-02B Intrawell Prediction Limit 7 10 (Ng/L) K1-04 Reporting Limit Reporting Limit 4 K1-05 Reporting Limit Reporting Limit 4 K1-08 Reporting Limit Reporting Limit 4 K1-09 Reporting Limit Reporting Limit 4 W-PIT1-2326 Intrawell Prediction Limit 6 9 'Concentration limits represent the average of the historical concentrations in each well. 2See required action 15 3 Reporting Limit. The concentration limit is representative of background and is calculated using an average. Where all sampling results are below the analytical method reporting limit, an average value cannot be calculated and establishing a concentration limit for the development of the statistical limit is not applicable. The reporting limit becomes the concentration limit and the statistical limit. 4Radioactivity measurements are corrected for the background radioactivity inside the measurement chamber. A negative value for radioactivity indicates that the average of the sample(s) measured lower than the instrument background by the amount shown and the actual value is very close to zero. 5The concentration limit may be set for an individual constituent at a level higher than natural background for the well if monitoring has determined that groundwater is impacted by the individual constituent. This allows the Discharger to evaluate whether concentrations are trending upward or a new release has occurred. Site wide background for tritium is approximately 100 pCi/L. Groundwater both up and downgradient of Pit 1 has been impacted with tritium above background concentrations.