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L- L <br /> LJuly 30, 2005 <br /> NOA Project Number. E05089A <br /> L3.2 On-Site Septic Permit History <br /> b One septic permit was found for the Site during file review at EHD on June 30,2005. The perrnit, <br /> 61 tank <br /> October 15, 1974,was for the installation of a new septic system with a 1,200-gallon septic <br /> tank and four 70-foot leach lines to serve a proposed three-bedroom residence. The address on the <br /> permit is 23301 South Hansen Road. This permit is included in the appendix of this report <br /> 3.3 On-Site Septic Repair Permit History <br /> No septic repair permits were found for the Site during file review at EHD on June 30, 2005. <br /> 3.4 Existing Septic Tank Usage in the Vicinity <br /> In an attempt to determine the septic system density for the vicinity of the Site, our office reviewed <br /> a 1993 aerial photograph of the subject property available from Microsoft Termserver. We counted <br /> Lthe building clusters within one square mile of the Site, and made the assumption that each building <br /> cluster has one septic system. Using this method,we determined that there are a minimum of 305 <br /> septic systems per square mile in the immediate vicinity of the Site.There is a high number of septic <br /> Lsystems due to a subdivision of dense housing that surrounds the subject property which is zoned R- <br /> R. <br /> LThe general area consists of agricultural land and rural residences,with the exception of a <br /> subdivision to which the subject property belongs. <br /> L 3.5 Septic Permit History in the Vicinity <br /> The following septic system permits were found for the vicinity of the Site during file review at <br /> EHD on June 30, 2005: <br /> LTable 1. <br /> Vi inity Septic S stem Permit Summary. <br /> LAddress,Date Tank Lines,Length,Pits Comments <br /> Capacity <br /> L 23251 S.Hansen Rd 1600 gal Four 100'lines New residential installation <br /> 42-97 <br /> 23276 S.Hansen Rd 1200 gal Three 70'lines New residential installation <br /> 10-12-76 <br /> V <br /> 23288 S.Hansen Rd 1600 gal Four 80'lines New residential installation <br /> 12-29-80 <br /> `, 23304 S.Hansen Rd 16000 Four 80'lines New residential installation <br /> 9-18-81 <br /> L <br /> 3 <br /> "44L <br />