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• • -2 - MONITORING AND REPORTING PROGRAM NO.R5-2004-0817 SOUTH SHORE PARCELS,UNOCAL OPERABLE UNIT UNION OIL COMPANY OF CALIFORNIA STOCKTON,SAN JOAQUIN COUNTY Maximum Detection Sampling Constituents EPA Analytical Method Limit(99/1)1 FrequencyZ Quarterly Depth to Groundwater '-- 0 5 Quarterly Volatile Organic Compounds 8021B or 8260B Quarterly Semivolatile Organic Compounds 8270 various' Qu y 8015M 50 Quarterly TPH as Gasoline < 50 Quarterly TPH as Diesel(Extractable) 8015M TPH as Motor Oil(Extractable) 8015M' 50 Quarterly Benzene 8020 or 8260B 0.5 Quarterly Toluene 8020 or 8260B 0.5 Quarterly Ethylbenzene 8020 or 8260B 0.5 Quarterly 8020 or 8260B 0.5 Quarterly Xylene various' Semi-annually' Dissolved Metals' 6000/7000 MTBE 8260B 0.5 Quarterly 5 Quarterly TBA' 8260B 0.5 Quarterly TAME 0.5 Quarterly DIPE' 8260B 0.5 Quarterly ETBE' 50 Quarterly Ethanol' 8260B 100 Quarterly Methanol' 8260B For nondetectable results. ' Groundwater level measurements for all South Shore Parcel monitoring wells shall be collected within an eight-hour period. Groundwater sampling activities for all wells requiring sampling shall be collected within five days. If the OUs are collecting water levels and performing sampling separately,the activities must be coordinated to meet these requirements. ' Maximum detection limits must meet or be lower than the applicable water quality objective,unless this is not achievable by an EPA or State approved laboratory method. See Table 2 for a list of applicable water quality objectives. ' Without silica gel cleanup. ' Dissolved metals to be analyzed include antimony, arsenic,beryllium,cadmium,chromium,copper,mercury,nickel, lead,selenium, silver,thallium,and zinc. ' Semi-annual sampling shall be conducted during the first and third quarters. ' Fuel oxygenates,including methyl tertiary butyl ether(MTBE),methanol,ethanol,tertiary butyl alcohol(TBA),tertiary amyl methyl ether(TAME),di-isopropyl ether(DIPE), and ethyl tertiary butyl ether(ETBE),shall be analyzed in all monitoring wells during first and third quarter monitoring events. If results are nondetectable for fuel oxygenates in all wells during both monitoring events,no further monitoring for oxygenates is required. If a fuel oxygenate is detected in either monitoring event,it shall be added to the quarterly monitoring program for the well in which it was detected. 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. As required by the California Business and Professions Code Sections 6735, 7835, and 7835.1, all reports shall be prepared by a registered professional or their subordinate and signed by the registered professional.