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v KLEINFELDER <br /> Our calculations are as follows: <br /> Ne = 1(2.0)(35)(1—.25)+0.5(9.8) = 52.5 +4.9 = 4.9 mg/1 as N <br /> 1(2.0)+ 9.8 2.0+ 9.8 <br /> CONCLUSIONS <br /> Based on the above evaluation, we conclude that at the groundwater level, the nitrate <br /> concentration of the wastewater produced by the maximum possible number of leach fields <br /> allowed should not exceed the state standards. <br /> The results of our percolation tests performed on the lots indicate that a suitable soil percolation <br /> stratum does not exist at a depth of 3.5 feet below the existing site grade. A suitable soil <br /> condition is defined as a strata capable of percolating water at a rate of 60 minutes per inch <br /> (min/inch) at a depth of 3.5 feet or 30 min/inch for deeper tests. A suitable soil stratum was <br /> encountered in the lots at depths ranging from about 11 to 19 feet below the existing site grade. <br /> A conventional septic tank/leach trench disposal system with seepage pits designed per SJCEHD <br /> criteria should adequately serve the proposed residence on these lots. The depth of the seepage <br /> pits will depend upon final site grade on these lots. <br /> LEWTATIONS <br /> The conclusions of this report are based on the information provided regarding the existing and <br /> proposed development and on the site conditions. It was assumed that the percolation test result <br /> is 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 /> Respectfully submitted, <br /> KLEINFELDER,INC. Reviewed by: <br /> OFESslo, <br /> C `F <br /> � Zc <br /> m aQNo Z <br /> Anthony P. Mazzei Patrick C. Dell, G. cC Exp. 3.3 . 4 <br /> Senior Engineer Senior Engineer 4 x} <br /> `rgTF0rfCHNN- <br /> APM:Ir FOF CAOI <br /> Attachment <br /> 23197.G01/ST03R290 February 14,2003 <br /> ©2003 Kleinfelder,Inc. Page 4 of 4 <br />