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�KL KLEINFELDER <br /> relatively shallow and the subsurface soils are fine grained and will not easily <br /> allow infiltration of effluent to the groundwater <br /> R = Average recharge rate of rainfall =.'9 2 inches per year (representing 80 <br /> percent of the average annual rainfaf approximately 11.5 inches. The <br /> remaining 20 percent of rainfall is assumed to drain off-site into natural or <br /> manmade drainages or be lost to evapotranspiration.) <br /> Nb = Background nitrate nitrogen concentration of rainfall recharge at the water <br /> table - 51 mg/l (per Technical Memorandum, Hydrologic and Soil <br /> Investigation for the Chico Urban Area, page 6, Dames and Moore, April <br /> 1996) <br /> A - Number of dwelling units per acres on septic ,,ta�e within a square mile <br /> t around the proposed Sikh Temple (unit/acre) = 0.17 stimated based on 54 <br /> #; lots, assuming 2 homes per lot (108 homes totat)�vided by (640 acres <br /> 5.83 acres)) <br /> W - Annual wastewater loadingper dwelling unit per acre inches 68 inches <br /> p 9 p (inches) _,� <br /> (based on 300 gpolresidence) <br /> Our calculation that includes both thep p p g ro osed temple, the existing home, and <br /> considering a square mile around the site is as follows: <br /> N, = 2.76(45)(1-0.2) + 9.2(0.5) 0.17)(0.68)(45) (1-0.2 + 0.5 9.2 ��mgll,as N1 <br /> (2.76+9.2) (0.17)(0.68) + 9.2 <br /> fill Given the above factors, we estimate that the proposed Sikh Temple would require an <br /> average waste/sewage flow ol8850 aal.lweek in order to exceed the state drinking <br /> water standard for nitrogen (N) of-10 mgll in groundwater. <br /> 10. CONCLUSIONS <br /> The conceptrat16h of nitrate-nitrogen (N) in the groundwater was above the state <br /> 4 standard ol 10 rrm /I. Based on these results and the results of our nitrate loading Al <br /> calculations, estimate that the potential nitrate-nitrogen concentration in <br /> groundwater, resulting from both the existing and new leach fields, will stay above the <br /> state standard of 10 mg/l. The Mokelumne River is the nearest water body to the site c, <br /> and is located approximately 2'/44 mi%gradilentof <br /> e e #of the property. Due to the distance to the �[�2, <br /> �.l Mokelumne River and the generaoundwater, we anticipate that the <br /> impact to surface water will be low. <br /> As previously mentioned, there was not a concentration of DBCP found in the <br /> groundwater in detectable amounts. <br /> 71324.G0113T06R648 June 19,2006 <br /> d 2006 Kleinfelder, Inc. Page 7 of 8 <br /> L <br />