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b MONITORING AND REPORTING PROGRAM NO. R5-2002-0807 UNION PACIFIC RAILROAD COMPANY TRACY RAIL YARD SAN JOAQUIN COUNTY Any additional wells installed subsequent to the effective date of this program also shall be monitored for four consecutive quarters for general minerals and dissolved lead using EPA Method 239.2 with a maximum detection limit of 0.01 mg/l. This MRP will be reviewed annually by the Board staff to determine if adjustments are necessary to maintain plume definition, provide needed information, or eliminate monitoring of certain wells because they are no longer deemed important. UPRR may, at any time, propose a change in the monitoring protocol of this MRP. Upon approval of the Executive Officer, a well, which has non-detectable concentration of certain contaminants for at least four consecutive quarters and is not needed for plume definition may be deleted from the sampling requirements of the MRP for those specific contaminants. REPORTING Semi-annual reports shall be submitted to the Board by the 301h of day the month following the end of each calendar semi-annual period until such time that the Executive Officer determines that the reports are not longer necessary. Each report shall include the status of any ongoing investigation and remediation, and in tabular form, the water quality data, depth to ground water, and free product, and groundwater contour maps. An annual report evaluating the effectiveness and progress of investigation and remediation shall be submitted to the Board by 30 January of each year and may be substituted for the first semi- annual monitoring report. The report shall contain at a minimum the following information: both tabular and graphical summaries of the monitoring data obtained during the previous year; ground water contour maps and contaminant concentration maps; trends in the concentrations of the pollutants in ground water monitoring wells; whether the contaminant plume is being captured by an extraction system or is continuing to spread; plans as needed for improving the ground water extraction or treatment system; and the anticipated date for completion of cleanup activities. The annual report also shall include the reasons for and durations of all interruptions in the operation of treatment systems. Based on the data from the previous year, the Discharger shall, in the annual report, identify data gaps and potential deficiencies/redundancies in the monitoring system or reporting program and propose any necessary revised ground water sampling plan frequency and analyses with the rationale for the proposed revisions. The results of any monitoring done more frequently than required at the locations specified in the Monitoring and Reporting Program shall be reported to the Board. 2