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REVISED MONITORING AND REPORTING PROGRAM NO. 96-807 2 , PACIFIC GAS AND ELECTRIC COMPANY LATHROP GAS DEHYDRATOR STATION SAN JOAQUIN COUNTY 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. 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 January and 30 July)until such time as the Executive Officer determines that the reports are no longer necessary. Each quarterly report shall include (a) a groundwater contour map, (b) a description of the quarterly sampling event including field notes, (c) a description of the status of any ongoing investigation or remediation, (d) an analysis of whether the contaminant plume is being captured by the extraction system, (e)tables containing the water quality analytical data, depth to groundwater, and free product thickness, and (f) 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 January of each year. This annual report may be substituted for the A _ second 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) an analysis of whether the contaminant plume is being captured by the extraction system or is continuing to spread, (e)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 a-ty 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 Monitoring and Reporting Program 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: GARY M. CARLTON, Executive Officer (Date) Ww:ww/lsb .'D Our mission is to preserve and enhance the quality of California's water resources,and ensure their proper allocation and efficient use for the benefit of present and future generations.