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k" KL ElNFELDER <br /> PERCOLATION TEST RESULTS <br /> Test Number Depth (Feet) Percolation Rate(minutes per inch) <br /> P-1 3 15 <br /> P-2 5% _ 6 <br /> San Joaquin County requires that an approximate 3-foot deep test percolate at a maximum rate of <br /> 60 minutes per inch in order to use standard leach lines. If a 3-foot deep test fails, the County <br /> requires that a soil strata with a maximum percolation rate of 30 minutes per inch be located in <br /> order the use a sump pit. Both the tests performed at this site produced passing 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 110 to 120 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 one additional septic System <br /> within the site. Therefore, with groundwater estimated at approximately 110 to 120 feet deep, in <br /> our opinion the likelihood of a significant change in the nitrate level of the groundwater beneath <br /> the site, because of one additional septic system, 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 located 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 /> KLEINFELDER, INC. <br /> Steven R. Davis, C.E.G. <br /> Senior Engineering Geologist <br /> 120-)- )YejAa /sem <br /> Ron Heinzen, G.E. <br /> Regional Manager/Senior Principal <br /> SRD:lr <br /> Attachments <br /> cc: San Joaquin County Environmental Health <br /> 204322-0I.G01/2019R917 October 12, 1999 <br /> © 1999 Kleinfelder,Inc. Page 2 of 2 <br />