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KLEINFEL DER <br /> of grease traps, three (two compartment) tanks in series, and a mostly kitchen waste flow has <br /> resulted in a very low nitrate concentration of the leachfield effluent. To evaluate the effect of <br /> increasing N. on Ne, the following two computations were made with Nµ, increased to 20 mg/l <br /> and 40 mg/l. <br /> Nc(with N.=20 mg/1) = 2(2)(20)(.65)+5.4 = 3.9 mg/1 as N <br /> 14.8 <br /> N,(with N„=40 mg/1) = 2(2)(40)(.65)+5.4 = 7.4 mg/1 as N <br /> 14.8 <br /> Both values remain below the maximum of 10 mg/l criteria. <br /> CONCLUSIONS <br /> Based on the above evaluation, we conclude that the wastewater produced by the proposed leach <br /> field should not have a nitrate as nitrogen (N) concentration at he Around.1 ev <br /> 10 mg/l. The results of our percolation tests indicate that very little percolation occurs in the <br /> near-surface clay materials, but that there are interbedded sand stratums that meet the percolation <br /> requirements established by San Joaquin County. The exact depth of the existing seepage pits is <br /> not known, but they were installed in about 1985/1986 at which time the maximum depth would <br /> have been approximately 25 feet. <br /> LIMITATIONS <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 results <br /> are 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 /> KL E LDE INC. <br /> cn9`=ssf�y�, <br /> SritdY �� <br /> Z <br /> Ron Heinzeof G.E. <br /> $ T <br /> Senior Principal iJ a <br /> hp. 3.31-07 <br /> RTH:lr s,.\reKew����� <br /> Attachments C, (;W <br /> 20-0268-01/ST02R886 December 5,2002 <br /> 0 2002 Kleinfelder,Inc. Page 5 of 5 <br />