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r Febntary 25, 2002 Job Number:LGOt-397 Page 15 ` found to range between 2.41 to 1.80 mg/L depending on the effectiveness of denitrification. ` Inclusion of the process waste water in the nitrogen balance tends to weight the concentration of nitrogen of the deep percolating recharge water(rain, septic system,process waste water)to the concentration of process waste water. In other words,with the relatively ` large quantities of process waste water,the combined recharge water is weighted toward the concentration of the process waste water. The average concentration of the process waste water was 6.71 mg/L-N during cherry processing season. In both scenarios, the average concentration of deep percolating water is below 10 mg/L.- N. The United States Environmental Protection Agency has established 10 mg/L-N as the �- maximum contaminate limit for nitrate as nitrogen. Unless the concentration of TKN in the process waste is consistently over 10 mg/L-N for the long term, it is unlikely that the combined deep percolating effluent will be over 10 mg/L-N. We understand the California Regional Water Quality Control Board is monitoring water quality of the process waste water. Though there were a number of assumptions describing waste water quantity and waste ` water percolation,the analysis has shown that an increase in wastewater flow above that measured last year will probably drive the average concentration of all the deep percolating water ` sources toward the average concentration of the process waste water. s it VIII. CONCLUSIONS AND RECOMMENDATIONS /(� 0 In conclusion, a satisfac nercnlation rate was achieved on the proposed 28.40 acre site. No satisfactory percolation rate was obtained near the existing eastern septic system located I� along Jack Tone Road on the existing Chinchiolo Fruit Packing facility. The depth to ground water was found to range recently between 104 to 120 feet. The nitrate concentration of ground water measured in the water well was 0.598 mg/L-N (598 ug/L- N or 2.7 mg/L-NO3). The Environmental Protection Agency maximum contaminate level for ` drinking water is 45 mg/L as NO3 and 10 mg/L-N. No DBCP was found in the ground water. The nitrate loading analysis has shown that the use of a"typical'or"standard"septic system will not cause a build up of nitrogen in the aquifer above the 10 mg/L-N,the maximum contaminate level established by the U.S. EPA for nitrate-N. This opinion is based on the two (2)nitrate loading scenarios and the assumptions discussed. Based on the results of this study, the proposed project is suitable for use with a standard 4 � x ��50�