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REVISED MONITORING AND REPOK i ING PROGRAM NO. 96-807 PACIFIC GAS AND ELECTRIC COMPANY LATHROP GAS DEHYDRATOR STATION SAN JOAQUIN COUNTY REPORTING Semi-annual reports shall be submitted to the Board by the 30th day of the month following the-end of each semi-annual period (i.e., by 30 April and 30 October) until such time as the Executive Officer determines that the reports are no longer necessary. Each semi-annual report shall include(a) a groundwater contour map, (b) contaminant concentration maps, (c) a description of the sampling event including field notes, (d) a description of the status of any ongoing investigation or remediation, (e) if applicable, an analysis of whether the contaminant plume is being captured by the extraction system, (f) cumulative data tables containing the water quality analytical results, depth to groundwater, and free product thickness, and (g) a copy of the laboratory analytical data report. An annual report which evaluates the effectiveness and progress of the investigation and remediation shall be submitted to the Board by 30 April of each year. This annual report may be substituted for the second semi-annual monitoring report. The annual report shall contain the following minimum information: (a) both tabular and graphical summaries of the monitoring data obtained during the previous year, (b) groundwater contour maps and contaminant concentration maps, (c) a discussion of the trends in the concentrations of the pollutants in the groundwater monitoring wells, (d) if applicable, an analysis of whether the contaminant plume is being captured by the extraction system or is continuing to spread, (e) if applicable, plans as needed for improving the groundwater extraction or treatment system, (f) the anticipated date for completion of cleanup activities, (g)the reasons for, and duration of, all interruptions in the operation of the treatment system, (h) an identification of any data gaps and potential deficiencies/redundancies in the monitoring system or reporting program, and (i) a proposal (with rationale) of any desired revisions to the groundwater sampling plan frequency and/or list of analytes. The results of any monitoring done more frequently than required at the locations specified in the MRP shall also be reported to the Board. Prior to the startup of a groundwater treatment system, the Discharger shall supply Board staff with a groundwater monitoring program designed to demonstrate the effectiveness of the groundwater treatment system. The Discharger shall implement the above monitoring program as of the date of this Order. Ordered by: &"ZfM_7ARLTO Executive Officer 29 September 1997 (Date) WSW:wsw/lsb