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Mr.George Rose <br /> August 21,2001 <br /> Page 3 . <br /> The percolation rate was found to be rapid in mo st ofthe 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 groundwater'above 10-mig/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 andperformed 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 /> warranties either expressed' or implied. Test t'iindings and •statements of professional opinion do not . <br /> constitute a guarantee or warranty,expressed or.implied. <br /> D.W Cep Best regards, <br /> tu�CJ No. 24 1 NEIL O.ANDERSON&ASSOC.;INC. <br /> CERTIFIED <br /> ENGINEERING <br /> GE0LQG15T Q <br /> 'SOF David,J. a ch,M.Sc., Senior Geologist <br /> CA <br /> CEG-2151;CHG-653 <br /> ;Garret S.H.Hubbart,M.Sc. <br /> DJW, GSHH:djw. QPOFESSlp Civil Engineer No. 59010 <br /> cry Na. 10 <br /> * Exp.6103 <br /> OF CAL1F <br />