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LUCCA WINERY <br /> SOIL SUITABILITY & NITRATE LOADING STUDY APRIL 2013 <br /> - from the project may be at a higher concentration than what would normally be found in <br /> a typical domestic or household system. <br /> This can be attributed to the lack of a dilution effect that graywater from showers, <br /> laundry, and dishwashing would provide from a household. The scientific literature cites <br /> nitrogen concentrations in residential septic effluent typically ranging from 17 ma N/L for <br /> basins, sinks, etc. to 140 mg N/L for toilet wastes. Therefore, considering a 70/30 <br /> percent usage for toilet water volume and sink water volume, respectively, a value of <br /> 103 mg N/L of septic effluent will be used to calculate nitrate-nitrogen loading for this <br /> project. A value of 66 mg N/L is typically used for residential calculations, as indicated in <br /> the scientific literature. <br /> B. Calculated Nitrate-Nitrogen Loading <br /> The calculated nitrate-nitrogen impact to the soil and ultimately to the groundwater is <br /> difficult to determine due to the large number of variables involved and variables <br /> - unknown at this time. These include: 1.) Impact from upgradient nitrate sources, 2.) <br /> Variability in wastewater flows, nitrogen concentrations and dilution effects from effluent <br /> and stormwater recharge, 3.) Changes in groundwater directional flow and elevation, 4.) <br /> Denitrification potential within the soil environment and within the confined and <br /> unconfined aquifers and 5.) Potential landscape uptake of nitrogen. <br /> Various scientific methods exist to estimate nitrate-nitrogen loading. This Study will use <br /> the Hantzsche/Finnemore Formula to predict the average resultant concentration of <br /> nitrate-nitrogen in effluent recharge water. As calculated below, the property has been <br /> assessed on a total areal loading basis of 20 acres for the entire APN exclusively, <br /> correlated with 42 gallons ADF per day as noted above. These two factors primarily <br /> dictate the average resultant concentration of nitrate-nitrogen in the recharge water, <br /> - which cannot exceed 10 ppm nitrate-nitrogen (45 ppm as nitrate). The following <br /> calculations demonstrate the resultant effluent recharge water from the project will not <br /> exceed the Maximum Contaminant at Level (MCL). <br /> Page 19 <br />