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MONITORING AND REPORTING-,ROGRAM NO.R5-2004-0840 J 2 DIAMOND WALNUT GROWERS INC. dba DIAMOND OF CALIFORNIA 1050 SOUTH DIAMOND STREET, STOCKTON SAN JOAQUIN COUNTY Constituent EPA Analytical Maximum Practical Sampling Frequency Method Quantitation Limit' Depth to Groundwater --- 0.01 foot Quarterly Total Chromium 200.8 0.5 /1 Quarterly Hexavalent Chromium 7199 1.0 Quarterly H 150.1 0.1 units Quarterly Electrical Conductivity 2510 1.0 Mho/cm Quarterly Dissolved Oxygen 360 0.01 m Quarterly Turbidity 2130B NTU Quarterly Total Hardness 2340B 5.0 m Quarterly Aluminum 6010B 50Quarterly Calcium 200.7 5.0 m Quarterly Chloride 300 2.5 m Quarterl Volatile Organic Compounds 8021 or 8260B 0.5 I Quarterly For nondetectable results. All concentrations between the Method Detection Limit and the Practical Quantitation Limit shall be reported as trace. REPORTING When reporting the 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 Regional Board within 48 hours of any unscheduled shutdown of any soil vapor and/or groundwater extraction system. As required by the California Business and Professions Code Sections 6735, 7835, and 7835.1, all reports shall be prepared by a registered professional or their subordinate and signed by the registered professional. Quarterly reports shall be submitted to the Regional Board by the 1st day of the second month following the end of each calendar quarter (i.e., by 1 February, 1 May, 1 August,and 1 November) until such time as the Executive Officer determines that the reports are no longer necessary. Each quarterly report shall include the following minimum information: (a) a description and discussion of the groundwater sampling event and results, including trends in the concentrations of pollutants and groundwater elevations in the wells,how and when samples were collected, and whether the pollutant plume(s) is delineated; (b) field logs that contain, at a minimum, water quality parameters measured before, during, and after purging, method of purging, depth of water, volume of water purged, etc.; (c) groundwater contour maps for all groundwater zones, if applicable; (d) isocontour pollutant concentration maps for all groundwater zones, if applicable;