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Mr.George Rose <br /> August 2l;2001 <br /> Page 3 <br /> The percolation rate was found to be rapid-in most of the deep percolation tests. The'permeable layer , <br /> is typically sandy,thin,and bounded by less permeable layers'. The surface soils are low permeability,often <br /> containing dark clay soils,which provide optimum conditions for denitrification within leach lines.Due to <br /> the highly heterogeneous soils,the deep depth to ground water,clayey surface soils,we do not believe that <br /> the rapid percolation rate will cause a buildup of nitrates in ground water above 10-mg/L=N. This issue was ' <br /> discussed in more detail iri the Addendum letter dated November 27,2000. <br /> Summary . <br /> After a review ofprevious workconducted at the site and work.completed during this effort,we have <br /> concluded that the new parcels are suitable for use with a septic system using,leach lines and seepage.pits. <br /> The soil suitability/nitrate loading study,dated October 12,2000,the addendum letter dated November'27, <br /> 2000,and the addendum letter dated April 12, 2001 indicates development density of 2.0 acres or greater <br /> is suitable for the area and will not cause a build up of nitrates in the ground water above safe drinking water <br /> levels established by the Environmental Protection Agency(EPA). All the new lots are greater than 2-acres <br /> 'in size and therefore satisfy this requirement. We recommend that the San Joaquin County Public Health <br /> Services Sewage Standards are followed. <br /> Limitations <br /> The summary and conclusions of this addendum letter are based on the-information provided <br /> regarding the 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 test.-It was assumed that <br /> the test holes and percolation test results are representative of the subsurface conditions in the general area. <br /> .Our professional services were performed,our findings obtained,and.our conclusions proposed in <br /> accordance with generally accepted engineering principles and practices. Thiswarranty.is inlieu of all other <br /> warranties either expressed or implied. Test findings and statements of professional opinion do not <br /> constitute a guarantee or warranty,expressed or implied. <br /> Best regards, <br /> No.2151 NEIL O.ANDERSON&ASSOC.,INC. <br /> ir <br /> EEMIFIED �. <br /> ENGINEERING <br /> GEOLOGIST Q + <br /> OF CA`-''� David J.Welch,M.Sc.,.Senior Geologist <br /> CEG-2151,CHG-653 <br /> Garret S.H_Hubbart,M.SC. <br /> DJW,GSHH:djw Civil Engineer No. 59010 <br /> H. <br /> QQ,pfrESS/p - <br /> vE�ioy <br /> • M <br /> o � <br /> i7 Q No. M 'sso�`r <br /> a Exp.8103. <br /> )F OAL�Fp <br />