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r r o� S < 'rP°��L#y f S/ S J OS Central Valley Baptist Church Page 2 of 6 Our Project Number: E07125A My 31,2007 Scope of Work The scope of work included a review of the Soil Suitability and Nitrate Loading Study (SS/NLS) report (NOA, 2002) and SS/NLS addendum letter (NOA, 2003), discussions with the EHD staff, review of several technical articles, and the complete layout, design, and calculations for a septic system. The scope of work does not include any permit fees or report review fees required by the EHD. General Based on several conversations with EHD staff, it was discussed that existing engineered septic ms unde permit in San Joaquin County do not reliably achieve nitrate levels ow 10 mg/L-N m the outflow of the system. Often, they exceed these goals. dltional n' reduction is thought to occur in these systems within the leach field; however; is reduction is difficult to quantify. Since the package treatment systems are relatively costly and don't perform reliably, the EHD has agreed to a proposal to permit and participate in an evaluation for an alternative design which utilizes aerobic and anaerobic processes contained within the trench similar to an intermediate sand filter system. This approach was described in an article published in Environmental Technology (Marseille and Anderson, 2001). The approach that Marseille and Anderson (2001), have taken has several advantages, including simpler design, readily available carbon source in the sand to enhance denitrification, lower capital cost, and low maintenance in the long-term. The leaching trenches are filled with sand and act like an intermediate sand filter septic system. Nitrification occurs in the upper of the trench where abundant air is available. Within the bottom of th 'on is promoted in a wet, anaero ' ironment with s plemental carbon by wa f wood chips, sawdust and A itial targetgoal of 50 to 60 percent, for total nitrogen reduction in 7rbe was , for he soils be the leach line trench . Since system monitoring willed by E D for the first yea , ations of the flow rates, in situ den , a ' fluent concentrations, will allow a reassessment of the nitrate oalation to determine whether a buildup of nitrates in the ground water above 10-mg/L is actually occurring. The successful operation of the septic system will not only depend on the design factors discussed, but will also depend on the quality of the influent entering the system. The septic system is not designed to handle a waste stream other than residential strength. Strong chemicals and solvents could seriously or permanently damage the septic 902 Industrial Way■Lodi,CA 95240-209.367.3701 ■Fax 209.369.4228 02007 Neil 0.Anderson&Associates.Inc.