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25650 East Lone Tree, SA-1. 52 <br /> Page 2 <br /> 5. Your study indicated that the use of the Hantzsche-Fennemore Equation results added to the <br /> 3.91 mg/l nitrate nitrogen in the groundwater are above the maximum contamination level of <br /> 10 mg/1 for nitrogen. The California Regional Water Quality Control Board's Basin Plan <br /> discourages development in areas where the maximum contamination level is greater than 10 <br /> mg/l nitrogen. You must provide data addressing how denitrification can be increased thus <br /> reducing the amount of nitrate nitrogen to within legal limits. <br /> If you use the Designated Level Methodology D&M criteria,please provide data and an <br /> explanation of how this data applies to the reduction of nitrate nitrogen at this site. Your <br /> study summary should indicate which type of septic system will correctly function for this <br /> project site. <br /> If you have any questions, please contact my staff person, Larry Godinho, Senior Registered <br /> Environmental Health Specialist at (209)468-0330. <br /> Karen Furst, M.D.,M.P.H. <br /> Health Officer <br /> Mike Huggins, Supervising R.E.H.S., R.D.I. <br /> Environmental Health Division <br /> MH:cf <br /> cc: Bruce J. Van de Steeg <br />