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r March 26,2003 <br /> Job Number:LG02-031 <br /> Page 10 <br /> r. <br /> The nitrate loading analysis utilizing the Hantzsche and Finnemore method has shown that the <br /> use of a standard type septic system will result in an Ne concentration of 9.6 mg/L-N(Nc <br /> r variable in the Hantzsche and Firmemore equation shown on Plate 9). <br /> Based on the results of this study, the proposed is suitable for use with a sewage treatment system <br /> optimized for nitrate re111p3eaL The existing high nitrate concentration of the shallow aquifer <br /> indicates the aquifer is most likely vulnerable to nitrate impacts originating from dairies, <br /> agriculture and/or septic systems. <br /> Our office recommends that an en 'peered sgptic s365tcm, optimized for nitrate removal, be <br /> utilized for the fully u1 t project. With the approval of EHD, it may be possible to construct the <br /> sewage treatment system in phases where the nitrogen removal modules could be added as <br /> ree project phases. A MicrOSCUtec, Orenco, or other equivalent package <br /> treatment system could be used to reduce the nitrate level of the effluent. o 0 ov�2 <br /> 7.0 LIMITATIONS I "4 <br /> Q � <br /> The conclusions of this report are based on the information provided regarding the existing and <br /> proposed development,the use of the subject property, and the site conditions as they existed at <br /> the time we excavated our test holes and performed the percolation tests. It was assumed that the <br /> r <br /> test holes and percolation test results are representative of the subsurface conditions in the <br /> general area. <br /> r <br /> Our professional services were performed, our findings obtained, and our conclusions proposed <br /> in accordance with generally accepted engineering principles and practices. This warranty is in <br /> r lieu of all other warranties either expressed or implied. Test findings and statements of <br /> professional opinion do not constitute a guarantee or warranty, expressed or implied. <br /> ., Best Regards, <br /> NEIL O. ANDERSON&ASSOC., INC. <br /> - — <br /> r <br /> Dav1 elch,M.Sc., Senior Geologist Garre S.H. Hubbart, M.Sc., General Manager <br /> CEG-2151, CHG-653 Civil Engineer No. 59010 <br /> QPpFE55/phi <br /> S'HH�B�F2 <br /> DJW/ �cPED GAO ti <br /> J. Ly <o "' Q sa � m <br /> ivPCO FSC �N a Exp.5-30.03 a <br /> O No. 2151 <br /> CERTIIAED y *JlF�rECHNV \Q <br /> ENGINEERING grfOFCtio' <br /> S GEOLOGIST �Q <br /> 9 oeeroM1 <br /> �OF CAL�FO <br /> A <br /> y <br /> ♦ Q <br /> 7J1p L♦' <br />