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Revised Monitoring and R-, jrting Program No. 93-100 3 Lawrence Livermore National Laboratory Site 300- Pit 1 San Joaquin County MONITORING 8. The current monitoring network at Pit 1 consists of twelve monitoring wells: upgradient wells K1-01C and K1-07, downgradient wells W-PIT1-02, W-PIT1- 2209, K1-02B, W-PIT1-2326, W-865-2005, K1-04, K1-05, K1-06 and cross- gradient wells K1-08 and K1-09. Downgradient wells K1-02B, W-PIT1-2326, K1-04, and K1-05 are detection monitoring wells. Wells K1-06, W-PIT1-02, W- PIT1-2209, and W-865-2005 are evaluation monitoring wells established to track existing plumes of perchlorate and tritium of unknown origin. All monitoring wells are shown on Attachment 3 and shall be monitored quarterly. 9. The Discharger shall collect, analyze and statistically evaluate one sample quarterly from each detection monitoring well. The Discharger shall collect and analyze one sample quarterly from each evaluation monitoring well and annually conduct trend analyses for each constituent of concern from the evaluation monitoring wells. Table 1 lists the groundwater monitoring analytical methods, reporting limits, frequency and applicable-monitoring network. Sampling procedures shall be in accordance with the LLNL Livermore Site and Site 300 Environmental Restoration Project Standard Operating Procedures, dated 1 June 1997 (UCRL-MA-109 1 15 Rev. 3 and future revisions). If unavoidable circumstances arise that prevent sampling from occurring according to schedule, the Discharger shall notify the Central Valley Water Board and reschedule the sampling as soon as practical. 10. Prior to construction of any new groundwater monitoring or extraction wells, and prior to destruction of any groundwater monitoring or extraction wells, the Discharger shall submit plans and specifications to the Central Valley Water Board for review and approval. Once installed, all new wells shall be added to the monitoring program and shall be sampled and analyzed quarterly for all constituents of concern as either detection monitoring wells or evaluation monitoring wells, as appropriate. WATER QUALITY PROTECTION STANDARD 11. For Class I Waste Management Units, CCR Title 23 § 2550.2(a) requires that the regional board establish a water quality protection standard which consists of a list of constituents of concern, statistical test methods, concentration limits (the average of historical concentrations of each constituent of concern in each detection monitoring well), statistical limits for single measurements, and monitoring points. If a discharger is conducting a detection monitoring program in conjunction with an evaluation or corrective action program, the regional board may establish separate water quality protection standards for each program pursuant to CCR Title 23. § 2550.2 (b) The constituents of concern are elements and compounds that are documented as having been buried in the landfills, as having been contained in firing table shot debris disposed of in the landfills, or as having been components of explosives experiments. The