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September 9, 2005 <br /> NOA Project Number: E05106B <br /> dw 3.2 On-Site Septic Permit History <br /> One septic permit was found for the Site address of 11573 Norman Avenue during file review at <br /> EHD on August 23, 2005. The permit, dated March 3, 1988,is for the installation of a 1200 gallon <br /> ` tank and two 50 foot leach lines with 3.5 by 25-foot deep seepage pits to serve the residence. <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 August, 2005. <br /> .J <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 Terraserver. We counted <br /> the 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 100 <br /> septic system per square mile in the immediate vicinity of the Site. <br /> The general use of the vicinity is agricultural land and associated residences and farm structures. <br /> 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 August 23, 2005: <br /> Table 1. <br /> Vicinity Septic System Permit Summary. <br /> Address,Date Tank Lines,Length,Pits Comments <br /> Capacity <br /> 11620 East Norman Avenue 1200 gal Three 40'leach lines,Three 36"by New installation to <br /> 5-6-02 25'seepage pits residence <br /> 11845 East Norman Avenue <br /> 1200 gal Three 90 leach lines New installation to <br /> 3-30-77 residence <br /> ` 11854 East Norman Avenue 1200g al Two 75'leach lines,Two 33"by New installation to <br /> 4-7-71 25'seepage pits residence <br /> 11898 East Norman Avenue 1200 gal Two 85'leach lines,Two 33"by New installation to <br /> ` 25'seepage pits residence <br /> 11880 East Norman Avenue 1200 gal Two 75'leach lines,Two 33"by New installation to <br /> 25'seepage pits residence <br /> r <br /> The majority of septic systems in the area appear to utilize leach lines with seepage pits. <br /> 3 <br />