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_ October 13, 2004 <br /> NOA Project Number: E040112B <br /> 3.0 EXISTING AND PROPOSED SEPTIC TANK USAGE <br /> 3.1 Existing On-Site Septic Tank Usage <br /> In his answers to the environmental questionnaire for the Surface Subsurface Contamination Report <br /> for the Site, dated October 4, 2004, Mr. Huerta indicated no knowledge of wells or septic systems <br /> on the Site. Mr. Fraser was also unaware of wells or septic systems (personal communication, <br /> October 6, 2004). <br /> 3.2 On-Site Septic Permit History <br /> No septic permits were found for the Site during file review at EHD on October 5,2004. <br /> 3.3 On-Site Septic Repair Permit History l / <br /> No septic repair permits were found for the Site during file review at EHD on October 5, 2004. <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 2002 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 140 <br /> septic systems per square mile in the immediate vicinity of the Site. <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 October 5,2004: <br /> Table 1. <br /> Vicinity Septic System Permit Summary. <br /> .� Address,Date Tank Lines,Length,Pits Comments <br /> Capacity <br /> 11573 Norman Ave.,3-22-88 1,200 gal Two 50-ft leach lines,two 36-in New installation to <br /> diameter by 25-ft deep seepage pits residence. 'L <br /> 11620 E.Norman Ave.,5-8-02 1,200 gal Three 40-ft leach lines,three 36-in New installation to <br /> r. diameter by 25-ft deep seepage pits residence. <br /> 11767 E.Norman Ave.,4-2-75 1,200 gal Two 90-ft leach lines,two 33-in New installation to <br /> diameter by 25-ft deep seepage pits residence. <br /> r <br /> 11845 E.Norman Ave.,3-30-77 1,200 gal Three 90-ft leach lines New installation to <br /> residence. <br /> r <br /> 3 <br />