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MONITORING AND REPORTIAOGRAM NO.R5-2004-0823 . -2- <br /> STOCKTON TERMINALS TECHNICAL COMMITTEE <br /> ARCO PRODUCTS COMPANY,TESORO PETROLEUM COMPANY, <br /> AND TIME OIL COMPANY <br /> BULK FUEL TERMINALS <br /> STOCKTON,SAN JOAQUIN COUNTY <br /> GROUNDWATER MONITORING <br /> Figure 1 shows all the monitoring wells for both STTC and ST Services. STTC is responsible for <br /> 76 of these monitoring wells. Wells P-26 and PS/MW-1M are monitored for depth to groundwater <br /> only. The groundwater monitoring program for 74 monitoring wells and any wells installed <br /> subsequent to the issuance of this MRP, shall follow the schedule below. Monitoring wells with <br /> free phase petroleum product or visible sheen shall be monitored, at a minimum, for product <br /> thickness and depth to water. Sample collection and analysis shall follow standard EPA protocol. <br /> Constituents EPA Analytical Method Maximum Detection Limit(µg/Il' Sampling <br /> Frequency"' <br /> Depth to groundwater --- Quarterly <br /> TPH as diesel 8015M 50 Quarterly <br /> TPH as diesel 8015M 50 Quarterly <br /> Benzene 8020 or 8260B 0.5 Quarterly <br /> Toluene 8020 or 8260B 0.5 Quarterly <br /> Ethylbenzene 8020 or 8260B 0.5 Quarterly <br /> Xylenes 8020 or 8260B 0.5 Quarterly <br /> MTBE° 8260B 0.5 Quarterly <br /> TBA° 8260B 5 Quarterly <br /> TAME" 8260B 0.5 Quarterly <br /> DIPE' 8260B 0.5 Quarterly <br /> ETBE4 8260B 0.5 Quarterly <br /> Ethanol° 8260B 50 Quarterly <br /> Methanol" 8260B 100 Quarterly <br /> For nondetectable results. <br /> Z All monitoring wells, including any monitoring wells installed after the issuance of this MRP, are sampled quarterly <br /> except for wells SP/WC-1S,TS-9,AR/MW-12B, and SP/WC-1M,which are sampled semi-annually during the first <br /> and third quarters. <br /> ' Groundwater level measurements for all STTC and ST Services monitoring wells shall be collected on the same day <br /> and all groundwater monitoring samples shall be collected during the same week. <br /> ° Fuel oxygenates, including MTBE,TBA,TAME,DIPE,ethyl tertiary butyl ether(ETRE),ethanol, and methanol <br /> shall be analyzed in all monitoring wells during two monitoring events in the first and third quarters. If results are <br /> nondetectable for fuel oxygenates for both sampling events,no further monitoring for oxygenates is required in that <br /> well. If a fuel oxygenate is detected,it shall be added to the quarterly monitoring program for the well in which it <br /> was detected. Monitoring wells that have already eliminated fuel oxygenate monitoring based on the previous MRP <br /> requirements do not need to be resampled for fuel oxygenates. <br /> REPORTING <br /> When reporting the data, the Discharger shall arrange the information in tabular form so that the <br /> date, the constituents, and the concentrations are readily discernible. The data shall be summarized <br /> in such a manner as to illustrate clearly the compliance with this Order. In addition, the Discharger <br />