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FALL CREEK REPORT OF WASTE DISCHARGE F.NGTNF.F.RTNG.INC. o. .. Wastewater Quantity and IDS Concentration. The total volume of process wastewater estimated for the facility used in the analysis based on future production levels estimated at 0.5 `• millions gallons per year. The average IDS concentration from the treatment wetland is assumed to be 660 mg/L. This value was used based on average IDS values measured at other Central %W Valley Wineries(700 mg/L) and adjusted slightly to account for expected percent removal of ♦„ sodium and potassium in the treatment wetland. Although, Kadlec and Knight(1996)report percent removal rates for sodium and potassium at approximately 9 and 45 percent,respectively, FCE assumed sodium and potassium removal rates of 5 and 30 percent, respectively. %W Storm Water Quantity and IDS Concentration. The total volume of storm water runoff that %W will enter the wetland and enter the land disposal area for both average annual and 100-year rainfall years was used in the mass-balance calculations and equal to approximately 0.52 and 0.92 million gallons per year, respectively. Virtually no data is published IDS concentrations in �- storm water runoff, so FCE assumed that the IDS concentration in the storm water runoff is 160 `. mg/L,which is equivalent to low strength wastewater reported by Metcalf&Eddy(2003). Direct Rainfall Quantity and IDS Concentration. The total volume of direct rainfall that falls on both the wetland and land disposal areas was also included in the analysis. The IDS �. concentration was assumed to be 40 mg/L based on rainfall data reported by Hem(1985). `. Evaporation Volume. Over the course of the year a substantial volume of water in the wetlands will be lost that could potential result in concentrating IDS in the wetland. FCE accounted for `w this loss in the calculation by subtracting the volume of water loss to evapo-transpiration in the %W wetland. The results of the mass-balance calculations are summarized in Table 5.6. %W Table 5.6. Estimated Inorganic Dissolved Solids Applied to Land Disposal Area `, Inorganic Dissolved Solids Concentrations Water Year m Average Water Year Conditions(18.1 in/yr) 371 %1W Wet Water Year Conditions(33 in/yr) 266 The results indicate that under the current level of operation the discharge of inorganic dissolved solids will be relatively low and lower. Further reduction of IDS is expected to occur due to %AW plant uptake of potassium in the wastewater and from natural cation exchange capacity of the `, soils. 5.5 Conclusions Summarizing our analysis of the proposed wetland system at Jessie's Grove Winery: • The proposed storm water facility is sufficiently sized to contain runoff and direct rainfall %W resulting from the average annual and 100-year annual rainfall year. JESSIE'S GROVE WINERY 26 FEBRUARY 2004