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kr Annual Domestic Wastewater System Groundwater Monitoring Report Sutter Home Winery,Lodi,CA July 22,2005 Page 3 Table 2—Groundwater Laboratory Analytical Results and Field Parameters (May 5, 2005) Laboratory Field Nitrate as N TKN TDS EC Tem erature H EC Analytical Method: 300.0 351.3 160.1 i20,I Reporting it: 0.25 mg/L 1.0 mg/L 10 mg/L 1.0 µmhos/cm °C S.U. S MCL: 10 mg/L w µ 500 mg/L* 900 µmhos/cm Monitor Well Sample Date DWS-1 5/05/2005 6.5 ND 698 1160 15.4 7.33 637 DWS-2 5/05/2005 6.1 ND 793 1300 15.5 7.16 698 DWS-3 5/05/2005 22 ND 922 1510 17.2 7.04 848 Unit Conversions Analytical mg/L:milligrams per liter,parts per million(ppm) TKN:Total Kjeldahl Nitrogen µmhos/cm: micromhos per centimeter TDS:Total Dissolved Solids µS:micro Siemens EC:electrical(specific)conductivity MCL:California DHS Secondary Maximum Contaminant Level *Recommended MCL of 500 mg/L for TDS;upper MCL of 1,000 mg/L "*Recommended MCL of900µmhos/cm for EC;upper MCL of 1,600µmhos/em ND=not detected at or above the reported laboratory detection limit SUMMARY . The MRP requires the three domestic groundwater monitoring wells associated with the domestic wastewater leachfield to be sampled on an annual basis. The laboratory analytical results of the groundwater samples collected from monitor wells DWS-1, DWS-2, and DWS-3 on May 5, 2005, are generally consistent with the historical laboratory results. Nitrate-N was detected above the California Department of Health Services (DHS) Primary Maximum Contaminant Level (MCL) of 10 milligrams per liter (mg/L) in the groundwater sample collected from DWS-3. Laboratory EC values were above the recommended DHS Secondary MCL of 900 µmhos/cm, but below the upper level of 1,600 µmhos/em in all of the groundwater samples: TDS were detected at concentrations above the DHS Secondary MCL of 500 mg/L in the all of the groundwater samples, but below the upper level of 1,000 mg/L. TKN was not detected in any of the groundwater samples collected at the Site during the current monitoring event. The groundwater gradient on May 9, 2005 was generally to the west in the vicinity of DWS-1 through DWS-3 (see Figure 3). Refer to Appendix D for historical groundwater monitoring data. The next annual sampling event is scheduled for May 2006. LIMITATIONS AND SIGNATURE Condor developed the interpretations and conclusions presented herein in accordance with generally accepted principles and practice. Conclusions presented in this report are professional opinions based on limited information obtained at the time of our Site visits. Condor has endeavored to determine as much as practical about the Site using conventional practices given our scope of services. Condor makes no representation as to the subsurface conditions at locations or times other than those sampled by our employees and reported in this document. If any changes are made or errors found in the information utilized in this report, the interpretations and conclusions contained herein shall not be considered valid unless the changes are reviewed by Condor and either appropriately modified or re-approved in writing. Condor's involvement in the work performed at this Site has been Iimited to collecting and recording depth-to-water measurements and field parameters; collecting and shipping groundwater samples; compiling data provided by analytical laboratories; and interpreting field data. Condor is not responsible for the accuracy and completeness of information collected and developed by others. `� CQNDOR