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MONITORING AND REPORTII*,T ROGRAM NO.R5-2004-0822 -2- SUPPORT 2- SUPPORT TERMINALS OPERA—.,G PARTNERSHIP,LP BULK FUEL TERMINAL#29 STOCKTON,SAN JOAQUIN COUNTY SAMPLING FREQUENCY' Quarterly Semi-annually' Annually3 Wells PS/MW-14,PS/MW-15,PS/P-11, OW-6D',OW-7A4,OW-7134,OW-7C4, PS/WC-4M PS/P-12,PS/P-13,PS/WC-2S, OW-7D',OW-8A4,OW-8B4,OW-8C4, PS/WC-3M5,PS/WC-3S5,ST/MW-1, PS/MW-17,PS/MW-19,PS/P-21, UP/MW-1,New Wells PS/WC-2M,PS/WC-4S ' All wells shall be monitored quarterly for water levels and the presence and thickness of free product. Groundwater level measurements for all STTC and Support Terminals Operating Partnership,LP monitoring wells shall be collected on the same day and all groundwater monitoring samples shall be collected during the same week. Z Wells shall be sampled semi-annually during the first and third quarters. 3 Wells shall be sampled annually during the third quarter. 4 These wells will be sampled semi-annually for two years(third quarter 2004 through first quarter 2006). If concentrations remain stable or decrease,the Discharger may eliminate sampling of these wells. 5 These wells will be sampled quarterly until an additional monitoring well is installed between these wells and the ST Services tank farm area,then reduced to annual sampling. Constituents EPA Analytical Method Maximum Detection Limit(jig/1)" Depth to groundwater --- --- TPH as diesel 8015M 50 TPH as diesel 8015M 50 Benzene 8020 or 8260B 0.5 Toluene 8020 or 8260B 0.5 Ethylbenzene 8020 or 8260B 0.5 Xylenes 8020 or 8260B 0.5 MTBE' 8260B 0.5 TBA' 8260B 5 TAME' 8260B 0.5 DIPE7 8260B 0.5 ETBE7 8260B 0.5 Ethanol' 8260B 50 Methanol' 8260B 100 6 For nondetectable results. -' Fuel oxygenates,including MTBE,TBA,DIPE,tertiary amyl methyl ether(TAME),ethyl tertiary butyl ether (ETBE),ethanol,and methanol shall be analyzed in all monitoring wells during two monitoring events in the first and third quarters. If results are nondetectable for fuel oxygenates for both sampling events,no further monitoring for oxygenates is required in that well. If a fuel oxygenate is detected,it shall be added to the quarterly monitoring program for the well in which it was detected. Monitoring wells that have already eliminated fuel oxygenate monitoring based on the previous MRP requirements do not need to be resampled for fuel oxygenates. REPORTING When reporting the data, the Discharger shall arrange the information in tabular form so that the date, the constituents, and the concentrations are readily discernible. The data shall be summarized in such a manner as to illustrate clearly the compliance with this Order. In addition, the Discharger shall notify the Board within 48 hours of any unscheduled shutdown of any soil vapor and/or groundwater extraction system.