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July 17,2002 <br /> Job Number: LG02-136 <br /> Page 12 <br /> The California Regional Water Quality Control Board, Central Valley Region has <br /> provided waste discharge requirements for the Olde Lockeford Winery. Based on California law, <br /> the Regional Water Quality Control Board will not allow any waste water discharge to land that <br /> will potentially impact ground water quality. Therefore, an assumption will be made that the use <br /> of evaporation ponds and land application to agricultural crop of waste water will not impact <br /> ground water quality. <br /> Table 8 presents the result of the nitrate mass balance for the rain water and septic <br /> effluent. The calculations are shown in detail on Plate 9. <br /> Table 8. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Result Acres Average Effluent Denitrification Rainfall Rainfall <br /> (mg/L-N)* Flow Concentration (%) Infiltration Concentration <br /> (gal/day) (mg/L-N)** (in) (mgMN) <br /> 2.5 22.8 842 45 25 6.8 0.17 <br /> ' Note: Maximum contaminate level(MCL)for Nitrate is 10 mg/L-N(45 mg/L as NO,). **Please note that the <br /> average septic waste water level of 45 mg/L-N is not related to the drinking water MCL of 45 mg/1-as NO,. <br /> Table 8 presents the summary of the analysis utilizing a septic system. As a result of the <br /> analysis, the use of the septic system will not cause a build up of nitrates above the maximum <br /> contaminate level for nitrates (10 mg/L-N) given the assumptions. This is primally due to the <br /> large size of the property, clayey soils,deep ground water depth, and relative low average daily <br /> flow of septic effluent. <br /> VIII. CONCLUSIONS AND RECOMMENDATIONS <br /> r <br /> In conclusion, a satisfactory percolation rate was achieved on the property. The depth to <br /> ground water below the site was found to be about 100 feet on the most recent county ground <br /> r water maps. The nitrate levels measured in the domestic and industrial/fire wells were 3.7 mg/L- <br /> N or below. The Environmental Protection Agency maximum contaminate level for drinking <br /> water for nitrate is 10 mg/L-N. No DBCP was detected in the domestic ground water well. <br /> The nitrate loading analysis has shown that the use of a septic system will not cause a <br /> build up of nitrogen in the aquifer above the maximum contaminate level for nitrogen(10 mg/L- <br /> N). The result of the analysis indicates nitrate level (Nc) for the property is 2.5 mg/L-N, 25%of <br /> the MCL for nitrate. <br /> 'OERt 1 <br /> iS 00 <br />