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REVISED MONITORING AND REPORTING PROGRAM NO. 93-701 -2- GEWEKE LAND DEVELOPMENT AND MARKETING SAN JOAQUIN COUNTY Analytical Maximum Samplinj34 Constituent Method Detection Limit' Frequency ' Depth to water ---- Benzene 8260B 0.5 µg/1 Quarterly Toluene 8260B 0.5 µg/1 Quarterly Ethylbenzene 8260B 0.5 µg/1 Quarterly Xylenes 8260B 0.5 µg/1 Quarterly Total Petroleum Hydrocarbons 8260B or 8015M 50 µg/1 Quarterly as gasoline 1,2-Dichlorethane(1,2-DCA) 8260B 0.5 µg/l Quarterly MTBE' 8260B 0.5 µg/l Quarterly TBA' 8260B 0.5 µg/1 Quarterly DIPE' 8260B 0.5 µg/1 Quarterly TAME' 8260B 0.5 µg/I Quarterly ETBE' 8260B 0.5 µg/1 Quarterly Methanol 8260B 100 µg/1 Quarterly Ethanol 8260B 50 µg/1 Quarterly Volatile Organic Compounds' 8260B 0.5 µg/l Quarterly 1 For non-detectable results. 2 Wells will be sampled quarterly for a minimum of one year. If a well is non-detect for all constituents at. detection limits listed,the sampling frequency for that well may be changed from quarterly to annually. 3 If a well that is sampled annually begins detecting constituents,then that well will revert to quarterly sampling until four additional consecutive quarters of non-detect for all constituents. 4 Annual sampling will occur in the first quarter of each calendar year. 5 Methyl tert butyl ether(MTBE),tertiary butyl alcohol(TBA),tertiary amyl methyl ether(TAME),di-isopropyl ether(DIPE), and ethyl tertiary butyl ether(ETBE) 6 Initially complete and report a full list scan of 8260B analyses once. If no additional VOCs(i.e.,besides 1,2-DCA)are found„then revert to a limited 8260B scan of the above-named constituents,reporting all unknown peaks in the normal range of the named constituents. Add all detected VOCs to the reporting program. REPORTING When reporting 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 remediation 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. Quarterly reports shall be submitted to the Board by the 20a' day of the month following the end of each calendar quarter (i.e., by 20 April, 20 July,20 October, and 20 January) until such time