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` M KLEINFELDER <br /> 1. upper 3.5 feet of site grade or 30 min/inch for deeper tests. Accordingly, the new sewage <br /> disposal system will need to consist of a leach field employing seepage pits that extend into the / "o <br /> silty sand stratum and are designed in accordance with the San Joaquin County Sewage t <br /> 6. Standards. The septic tank for the new disposal system will also need to be sized in accordance <br /> with the San Joaquin County Sewage Standards. <br /> LEven though the estimated waste/septic flow and nitrate concentration of the leach field <br /> effluent value used in our calculations are probably conservative, we estimate that the potential <br /> nitrate-nitrogen (l) concentration in groundwater resulting from both the existing and new <br /> leach fields should be below the state standard of 10 mg/1. Accordingly, the impact to <br /> 3,h surrounding wells should be low. The impact to the Calaveras River (the nearest natural water <br /> rr. <br /> body located about 'h mile to the southeast) should also be low. <br /> 9. LEMTATIONS <br /> r <br /> The conclusions of this report are based on the information provided regarding the existing <br /> development and on the site conditions. It was assumed that the percolation test results are <br /> 6. representative of the subsurface conditions in the general area. <br /> This completes the scope of work requested. Our work was performed in general accordance <br /> with the standard of care that exists in San Joaquin County. No other guarantee or warranty, <br /> expressed or implied, is made. <br /> tr <br /> 6. <br /> r <br /> ` 40141.COI/ST04P206 February 24,2004 <br /> ©2004 Kleinfelder,Inc. Page 7 of 7 <br />