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L <br /> November 21,2006 <br /> NOA Project Number. E06045B <br /> L 6.7 Discussion of Percolation Test Results <br /> The soils within the sewage disposal areas of the parcels have demonstrated a satisfact <br /> percolation rate in accordance with the requirements of the EHD for the use of e Z eered septic <br /> system. <br /> i <br /> 6.8 Discussion of Septic System Sizing <br /> Septic System Construction should follow the San Joaquin County On-Site Wastewater Disposal / <br /> Standards where applicable. We recommend a Civil Engineer prepare a septic system design for the <br /> Parcel unless additional percolation testing on the parcel indicates a satisfactory rate is achieved and ' <br /> approved by the EHD. Our office has been contracted by the client to prepare an engineered septic <br /> ` system design. <br /> L 7.0 CONCLUSIONS <br /> In summary,percolation rates that meet the minimum EHD standards were achieved in the <br /> L proposed septic disposal areas of the site. The parcels appear suitable for the use of an engineered <br /> septic system.We recommend a Civil Engineer prepare a septic system design for the Parcel unless <br /> additional percolation testing on the Parcel indicates a satisfactory rate is achieved and approved by <br /> the EHD. Our office has been contracted by the client to prepare an engineered septic system ' <br /> design. <br /> A perched layer of water was encountered at 6.08 feet during the drilling of percolation test holes <br /> on October 26, 2006. The on-site water well was tested for nitrate a CP. DBCP was non- <br /> detectable, and nitrate concentration in ground water was fbt}nd to be '2�5 g/L-NO3,which is <br /> Lbelow the maximum contaminant drinking water limit f 45 lapgg/IrNO3. <br /> 8.0 LIMITATIONS <br /> The conclusions of this report are based on the information provided regarding the existing and <br /> ` proposed development, the use of the subject property,and the site conditions as they existed at the <br /> time we excavated our test holes and performed the percolation tests. It was assumed that the test <br /> holes and percolation test results are representative of the subsurface conditions in the general area. <br /> L <br /> 9 <br /> L '-444 <br />