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f ff February 15,2006 - NOA Project Number: E06006A Vicinity Septic System Permit Summary. Address,Date Tank Capacity Lines,Length,Pits Comments 9000 South Airport Way 1200 gal One 100'leach line,one 36" New installation to a mobile 4-29-80 diameter by 25'deep seepage pit home J .9326 South Airport Way 1200 gal Three 80'leach lines New installation to a residence 9-16-88 9234 South Airport Way 1200 gal 20'x 35'x 18" filter bed New installation to a residence 6-1-05 The septic systems in the area appear to utilize leach lines, seepage pits, and filter beds. rt _ 3.6 Septic Repair Permit History in the Vicinity No septic system repair permits were found for the vicinity of the Site during file review at EHD on January 31, 2006. 3.7 ` Expected On-Site Maximum Septic Tank Usage -- Maximum expected usage on the property would be for the existing residence, a potential second dwellirig unit, and the proposed agricultural store. According to Ms. Del Rio, the maximum expected number of employees per day is four to five. The maximum expected number of customers per day is 35. Septic system design should be based on the On-Site Wastewater Disposal Standards or other engineering recommendations. 4.0 GROUND WATER INFORMATION 4.1 Ground Water Depth and Gradient The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground `water depth and elevation maps were reviewed to determine the ground water levels near the Site. The Fall 1998 and Spring 1999 maps,are the most current official maps available from the County. According to these maps (Plates 4-7), ground water lies between 18 and 28 feet below ground surface and flows at a gradient of about 5 feet per mile to the north-northeast in the vicinity of the Site. No ground water was encountered by the staff of Neil O. Anderson&Associates, Inc. during the drilling of the percolation test hole to a depth of 3.28 feet on January 31, 2006. 4 t