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Annual Domestic WastcwaLl. System Groundwater Monitoring Report Sutter Home Winery,Lodi,CA June 16,2006 Page 3 Table 2—Groundwater Laboratory Analytical Results and Field Parameters(May 9, 2006) Laboratory nu. [ Nitrate as N TKN TDSEEC Tem C Anal tical Method: 300.0 351.3 160.120.IReporting Limit: 0.25 mg/L m'/L 10 mg/L mhos/cm °C S MCL: 10 mg/L 500 mg/L* 900µmhos/cm** Monitoring Sample Well Date DWS-1 05/09/06 59 <1.0 680 1040 I6.04 7.33 1045 DWS-2 05/09/06 7.0 <1.0 840 L1360 15.85 7.31 1221 DWS-3 05/09/06 29 <1.0 860 17.39 7.15 1340 Unit Conversions Ana"cal mg/L:milligrams per liter,parts per million(ppm) TKN:Total Kjeldahl Nitrogen pmhos/cm: micromhos per centimeter TDS:Total Dissolved Solids µS:micro Siemens EC:electrical(specific)conductivity Temp=Temperature MCL:California DHS Secondary Maximum Contaminant Level S.U.:Standard Units *Recommended MCL of 500 mg/L for TDS;upper MCL of 1,000 mg/L **Recommended MCL of 900µmhos/cm for EC;upper MCL of 1,600 gmhos/cm I ND=not detected at or above the reported laboratory detection limit SUMMARY The MRP requires the. three 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 monitoring wells DWS-1, DWS-2, and DWS-3 on May 9, 2006, are generally consistent with the historic laboratory results (attached). 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 micromhos per centimeter (µmhos/cm), but below the upper level of 1,600 µmhos/cm in all of the groundwater samples. Total Dissolved Solids 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._Total Kjeldahl Nitrogen was not detected in any of the .groundwater samples collected at the Site during the current monitoring event. The groundwater gradient on May 9, 2006 was generally to the west, consistent with historic data (see Figure 3). The next annual sampling event is scheduled for May 2007. 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. 't �� CONDOR