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S.J fr November 27,2006 NOA Project Number: E06115A i_ south by Whiskey Slough. 3.0 EXISTING AND PROPOSED SEPTIC TANK USAGE 3.1 Existing On-Site Septic Tank Usage Two septic systems are present on the subject property. One of the systems is associated with the marina office and snack shop.The second septic system is located near the center of the property and is associated with a permanent trailer on the site.The waste from the 40 trailers is currently pumped and hauled offsite. L 3.2 On-Site Septic Permit History Three septic permits were found for the address 3401 Whiskey Slough Road during file review at the L EHD on September 16,2006. Table 1. On-Site Septic System Permit Summary. Address,Date Tank Lines,Length,Pits Comments Capacity 3401 South Whiskey Slough 1500 gal Treatment package plant,effluent Effluent to meet 5-27-68 chlorinated and disposed to slough requirements of RWQCB 3401 South Whiskey Slough 3000 gal Two,20 x 30 filter bed Replacement of 5-27-68 4-19-77 permit 3401 South Whiskey Slough 2-1200 gal 55 x 20'filter bed Installation of a filter bed 8-21-80 The septic permits appear to be for the installation of a treatment package plant which was then I` replaced by a septic tank and filter bed.The third permit was for the installation of a separate system. C Repair tic 3.3 On-Site Se Permit �. P � P � History LSee Section 3.2 for a description of repair permits reviewed at the EHD on September 16, 2006. >"2'� 3.4 Existing Septic Tank Usage in the Vicinity IN. In an attempt to determine the septic system density for the vicinity of the Site, our office reviewed a recent aerial photograph of the subject property available from Google Earth. We counted the building clusters within one square mile of the Site,and made the assumption that each building t_ cluster has one septic system. Using this method,we determined that there are a minimum of 3 r