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Mr.George Rose <br /> August 21,2001 <br /> Page 3 . <br /> 'The percolation rate was found to be rapid inmost of the deep percolationtests. 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.heierogeneous 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 in the Addendum letter dated November 27,2000. <br /> Summary <br /> After a review of previous work conducted 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 indicate a 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. This warranty is in lieu of all other <br /> warrantics either expressed or implied. Test findings and .statements of professional opinion do not . <br /> constitute a guarantee or warranty,expressed or implied.a. : <br /> Q(0 Best regards, <br /> 4r Q� No.2151 �S NEIL O. ANDERSON&ASSOC.,INC. <br /> C RTIFiED <br /> ENGINEERING <br /> GEOLOGIST �Q <br /> 9Ofi <br /> CA LDavid J. a ch,M.Sc., Senior Geologist <br /> CEG-2151;CHG-653. <br /> Garret S.H.Hubbart,M.Sc. . <br /> DJW,GSHH:djw. aQ,OrrEnss Civil'Engineer No. 59010 <br /> C9 No. 10 <br /> d Exp.6f03 ` <br /> OF CAtIF� <br />