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knKLEINEELDER <br /> San Joaquin County requires that an approximate 3-foot deep test percolate at a maximum rate of <br /> 60 minutes in order to use standard leach lines. If a 3-foot deep test fails, such as in this case, the <br /> County requires that a soil strata with a maximum percolation rate of 30 minutes per inch be <br /> located in order the use a sump pit. The two deeper tests performed at this site produced passing <br /> percolation tests. <br /> The current regional groundwater depth map published by the San Joaquin County Flood Control <br /> and Water Conservation District indicates the depth of groundwater in the site area was <br /> approximately 100 to i 10 feet in spring 1998. We note that our scope of services did not include <br /> a detailed evaluation of the potential for the septic systems to affect the quality of the <br /> groundwater; however, the project involves the possibility of only three additional septic systems <br /> within the approximate 160-acre site. Therefore, with groundwater estimated at approximately <br /> 100 to 110 feet deep, in our opinion the likelihood of a significant change in the nitrate Ievel of <br /> the groundwater beneath the site, because of three additional septic systems, is remote. <br /> This completes our scope of services at this time. Based on the above information, it is our <br /> opinion that the site is suitable for septic system use. The septic systems should be Iocated and <br /> any future wells should be constructed following County guidelines. <br /> We trust this letter presents the information required at this time. If you have any questions <br /> regarding this letter please contact us. <br /> Respectfully submitted, <br /> KLEIINFELDER, INC. <br /> Steven R. Davis, C.E.G. <br /> Senior Engineering Geologist <br /> Q�pfESSIONA <br /> !C*?� �FRRY y� �yy <br /> Ron Hemzen, G.E. C o A <br /> Regional Manager/Senior Principal Ka <br /> * UP. 3-31-03 {r <br /> SRD:lr ar9r fa7EC%N�°�4¢�`� <br /> F <br /> Attachments dF CAt�F <br /> cc: San Joaquin County Environmental Health <br /> 20-4370-01.G01/2019L811 September 3, 1999 <br /> 0 1999 Kleinfelder,Inc. Page 2 of 2 <br />