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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 syste�� <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 bed septic system modified for nitrate reduction is recommended for all <br /> parcels. If parcels 1, 2, 3, 4, 5, 6, and 7 add a second dwelling unit, a separate <br /> engineered septic system optimized for nitrate reduction is recommended. <br /> 2) The filter bed system should be supplemented with approximately 4-inches of <br /> peat or or i�9a>> 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 denitrificaton 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 /> p,ED GF oQ;,OFESS10CO C <br /> C QP No. 2151 S � W 0 010 y M <br /> CERTIFIED Exp.6/03 * = y <br /> ENGINEERING <br /> GEOLOGIST ��Q sgTFOF CAL1F���\P <br /> TFOF CAL\FO <br />