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DRAFT RFVISED MONITORING APREPORTING PROGRAM NO. 94-806 IS IZ)ER Tv,__)RGAN ENERGY PARTNERS HOLT PETROLEUM RELEASE SITE SAN JOAQUIN COUNTY Analytical Maximum Sampling Constituent Method Detection Limit' Frequency Petroleum Fuel Oxygenates 8260 0.5µg/1 Quarterly Total Dissolved Lead' 7421 5.0 µg/1 Quarterly For non-detectable results. 'If lead is not detected during two quarters of monitoring,then the Discharge shall not be required to continue analyzing for this constituent PRIVATE WELL MONITORING Unless refused access by the property owner(s), the Discharger shall sample any private wells that are within 500 feet of the down- or side-gradient edge of the contaminated area. These wells shall be sample dR at the same frequency and for the same constituents as the monitoring wells, except depth to groundwater. The Discharger is to notify the Board as soon as it learns that a private well contains any detectable constituents of concern. Immediate confirmation samples must be collected and the Board apprised of the results. SURFACE WATER MONITORING A All surface water samples shall be grab samples. Surface water samples shall be taken from two locations: Station S-1 shall be upstream from the point of release, and station S-2 shall be downstream from the point of release. The following shall constitute the surface water monitoring program: Analytical Maximum Sampling Constituent Method Detection Limit' Frequency 1 F Benzene 8020 or 8260 0.5 µg/1 Quarterly Toluene 8020 or 8260 0.5 µg/1 Quarterly Ethylbenzene 8020 or 8260 0.5 µg/1 Quarterly ?xylene 8020 or 8260 0.5 µg/1 Quarterly r� TPH-gasoline 8015M 50 µg/1 Quarterly 1 TPH-diesel 8015M 50 µg/1 Quarterly Methyl t-butyl ether 8260 0.5 µg/1 Quarterly While conducting the surface water sampling, the Discharger shall note the surface water conditions throughout the reach bounded by stations S-1 and S-2. Notes on surface water conditions shall be summarized and submitted in the monitoring report. 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 the groundwater extraction system.