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h19 KLEINFELDER Nb = Background nitrate nitrogen concentration of rainfall recharge at the water table = 1.0 mg/1 (typically ranges from 0.5 to 1.0 mg/1 per abstract titled "Predicting I Ground-water Nitrate Nitrogen Impacts"by Hantzsche and Finnemore (1993)) Our calculation is as follows: ' = 91 + I 2.3 3 = 6.33 mg/1 as N NC _ _ 35 1 -0.35 + 1 . X1.0 �3 )+123 4 + 12.333 22 CONCLUSIONS Based on the above evaluation, we conclude that wastewater produced by the proposed residence op and a second sidaur�e on the property should not cause the nitrate levels in groundwater below the site to rise above the state standards. Furthermore, the results of our percolation tests indicate that a conventional septic tank/leach trench sewage disposal system draining to seepage pits disposal should adequately serve the ocedt thedence. As an ercolat ng sandts strave to seepage pits, tum encountered at a depth of trenches could be cut deep to mte about 15.5 feet. LIMITATIONS r The conclusions of this report are based on the information provided regarding the existing and proposed development and on the site conditions. It was assumed that the percolation test results are representative of the subsurface conditions in the general area. This completes the scope of work requested. Our work was performed in general accordance with the standard of care that exists in San Joaquin County. No other guarantee or warranty, expressed or implied, is made. Respectfully submitted, KLEINFELDER, INC. - l• �O FESS�� Ronald E. Loutz nhise �� ¢y N. GUS l� Staff Engi r `r�:� No 2283 s m r � U F OF E , eotec al Department Manager REL-1 Attachment cc: SKW and Associates i December 20,2001 2014684-01.G01/2011R1570 Page 4 of 4 ©2001 Kleinfelder, Inc.