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WASTE DISCHARGE REQUIREMENTS ORDER R5-2013-0028 -15- DELICATO VINEYARDS, INC. DELICATO FAMILY VINEYARDS SAN JOAQUIN COUNTY 2 Monitoring data combined from MW-2 and MW-2r. 3 Monitoring data collection began in August 2008. 4 Lowest potentially applicable water quality goal to protect the agricultural beneficial use. 5 Primary MCL. 6 Secondary MCL. Secondary MCL range. 60. On 22 August 2012, groundwater samples collected from the six monitoring wells were analyzed for additional parameters. A summary of the supplemental groundwater analytical results is provided below. Analytical Result(mg/L) Well ID Dissolved Dissolved Dissolved Ammonia FDS Arsenic Iron Manganese MW-1 <0.2 590 0.01 <0.05 0.0022 MW-2r <0.2 1,040 0.007 <0.05 1.62 MW-3 <0.2 1,360 0.007 <0.05 0.0175 MW-4 <0.2 520 0.007 <0.05 <0.0005 MW-5 <0.2 680 0.005 <0.05 <0.0005 MW-6 <0.2 80 0.022 <0.05 0.0009 Potential Water z s 3 QualityObjective -- '- 0.010 0.30 50 No standards applicable to the beneficial uses of groundwater. 2 Primary MCL. 3 Secondary MCL. 61. Two sets of non-parametric statistical analyses were performed to assess ambient background groundwater conditions for TDS, electrical conductivity, nitrate as nitrogen, and TKN for data collected from August 2008 to September 2011. The combined analytical results from monitoring wells MW-4, MW-5, and MW-6 were selected because these wells are located upgradient from the current LAAs. The combined groundwater monitoring data from MW-4, MW-5, and MW-6 were compared to the results from MW-4, as MW-4 is located further upgradient from the other two monitoring wells. Monitoring well MW-6 is located near an irrigation canal, which represents a source of high quality water that may influence local groundwater conditions. The following table summarizes statistical analysis of key salinity constituents for the three background groundwater monitoring wells. Analyte I Units I MW-4, MW,5, and M -6 I MW-4 I Potential Water