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REVISED MONITORING AND RErvRTING PROGRAM NO.93-112 -3- LODI VINTNERS, INC. SAN JOAQUIN COUNTY shall be sampled and analyzed according to the schedule below. All samples shall be collected using approved EPA methods. Groundwater elevations shall be calculated to determine groundwater gradient and direction of flow. Prior to sampling, the groundwater elevations shall be measured and the wells shall be purged of at least three well volumes or until temperature,pH, and electrical conductivity have stabilized. Depth to groundwater shall be measured to the nearest 0.01 feet. Samples shall be collected and analyzed using standard EPA methods or the latest edition of Standard Methods. Groundwater monitoring shall include, at a minimum, the following: Type of Sampling Reporting Constituent Units Sample Frequency 4 Frequency 4 Depth to Groundwater ±0.01 feet Measurement Quarterly Quarterly Groundwater Elevation) ±0.01 feet Calculated Quarterly Quarterly Gradient feet/feet Calculated Quarterly Quarterly Gradient Direction Degrees Calculated Quarterly Quarterly pH pH units Grab Quarterly Quarterly Nitrate as Nitrogen mg/L Grab Quarterly Quarterly Total Kjeldahl Nitrogen mg/L Grab Quarterly Quarterly Total Dissolved Solids mg/L Grab Quarterly Quarterly Fixed Dissolved Solids mg/L Grab Quarterly Quarterly Sulfate mg/L Grab Quarterly Quarterly Standard Minerals 2,3 mg/L Grab Annually Annually Groundwater elevation shall be determined based on depth-to-water measurements from a surveyed measuring point elevation on the well. 2 Standard Minerals shall include at least the following: boron, calcium,iron,magnesium,manganese,phosphorus, potassium, sodium,chloride,sulfate,total alkalinity(including alkalinity series), and hardness. 3 Standard Minerals shall be analyzed in the fourth quarter of the year. 4 Beginning with the third quarter,2006. REPORTING In reporting monitoring data, the Discharger shall arrange the data in tabular form so that the date, sample type (e.g., influent monitoring, groundwater monitoring, etc.), and reported analytical result for each sample are readily discernible. The data shall be summarized in such a manner to clearly illustrate compliance with waste discharge requirements and spatial or temporal trends, as applicable. The results of any monitoring done more frequently than required at the locations specified in the Monitoring and Reporting Program shall be reported in the next scheduled monitoring report. As required by the California Business and Professions Code Sections 6735, 7835, and 7835.1, all groundwater monitoring reports shall be prepared under the direct supervision of a registered professional engineer or geologist and signed by the registered professional. A. Monthly Monitoring Reports Monthly reports shall be submitted to the Regional Board by the Ist day of the second month