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February 27,2002 <br /> Job Number: LG02-048 <br /> Page 14 <br /> Due to the sandy(/soils encountered, shallow depth to ground water, and elevated levels of <br /> nitrate in the shallow ground water, we recommend the use of a filter bed septic system modified. <br /> for additional nitrate reduction. If a second unit dwelling is constructed on Parcels 1, 2, 3, 4, 5, <br /> 6, and 7, an engineered septic system optimized for nitrate reduction should be utilized for the <br /> second dwelling unit. If this second unit is desired, our office is experienced in the design of <br /> engineered septic systems. The recommendations for the project are as follows: <br /> 1) A filter b stemmndi i�d for nitrate,Ieductiogis_,recommended,for all. <br /> parcels. Iarcels 1, 2, 3, 4_5�6aand 7 add a second dw,eling unit,aiseparate <br /> engineered septic system optimized for nitrate reduction is recomznekidgd.,. <br /> 2) The filter bed system should be supplemented with approximately 4-inches of <br /> peat or omania nil This material should be placed on the base of the filter bed <br /> below the filter material. This material should slow the percolation rate and <br /> provide a carbon source to increase denitrifncaton of the effluent. <br /> 3) Follow San Joaquin County Public Health Services Sewage Standards where <br /> applicable. <br /> IX. LIMITATIONS <br /> The conclusions of this report are based on the information provided regarding the <br /> existing and proposed development, the use of the subject property, and the site conditions as <br /> they existed at the time we excavated our test holes and performed the percolation tests. It was <br /> assumed that the test holes and percolation test results are representative of the subsurface <br /> conditions in the general area. <br /> Our professional services were performed, our findings obtained, and our conclusions <br /> proposed in accordance with generally accepted engineering principles and practices. This <br /> warranty is in lieu of all other warranties either expressed or implied. Test findings and <br /> statements of professional opinion do not constitute a guarantee or warranty, expressed or <br /> implied. <br /> Best Regards, <br /> NEIL O. ANDERSON & ASSOC., INC. <br /> Davi J. Welch, M.Sc., Senior Geologist Garret S.H. Hubbart, M.Sc., Project Manager <br /> CEG-2151, CHG-653 Civil Engineer No. 59010 <br /> POV ESS/p <br /> o GFOC G �� <br /> �O J. WF O �Q <9,J CO <br /> v� z E <br /> ' p� No. 2151 y -4 0 ( 010 -1 mcc <br /> CERT!;iED d Exp.6/03 <br /> GEST � s�grIVI <br /> EOFCNUF�\�\P o''s <br /> T�OF CAS\FO <br />