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05 November 2014 <br /> AGE Project No. 14-3119 <br /> Page 16 of 17 <br /> 10.0. TOTAL NITRATE IMPACT FROM PROPOSED PROJECT <br /> Based on the assumptions of the report, proposed NO3_N mass of wastewater and the <br /> calculations of the NO3_N loading predicted, the proposed development could negatively <br /> impact NO3_N loading rates within the aquifer. The soil at the site appear to be adequate <br /> for nitrate degradation and proper leaching of wastewater. However, elevated leaching <br /> field will be required and must meet the SJCO code for land use. <br /> 11.0. MITIGATION METHODS PROPOSED <br /> To mitigate any known or potential future impacts to soil and ground water from nitrate <br /> from proposed new development and increased septic usage, the following mitigations <br /> could be implemented or conducted: <br /> • Maximize wastewater hold time where practical; <br /> • Installation of raised leaching field and system lines for infiltration, <br /> • Avoid use of bioattenuation chemicals (bleach etc.); <br /> • Properly and regularly maintain property septic systems; <br /> If re-location or expansion of leach fields becomes necessary, leach lines should include <br /> high organic substrates under and surrounding the lines installed. <br /> 12.0. CONCLUSIONS <br /> Based on the above referenced Soil Suitability and Nitrate Loading Study, AGE concludes <br /> the following: <br /> • All proposed and approved septic system use and construction should follow the <br /> EHD On-Site Waste Disposal Standards. If required by the EHD, A California <br /> Register Engineer (CRE) should plan and propose a designed septic package to <br /> reduce or minimize the nitrogen loading and an appropriate leaching mechanism. <br /> • Site redevelopment is appropriate with the use of the newly installed multiple-use <br /> water supply well and existing septic systems. <br /> Advanced GeoEnvironmental,Inc. <br />