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•.O June 14,2005 NOA Project Number: E05066A ✓3.6 Septic System Repair Permit History in the Vicinity The following septic system repair permits were found for the vicinity of the Site during file review 6. at EHD on May 17,2005: Table 2. Vicinity Septic System Repair Permit Summary. Address, Date Tank Lines,Length,Pits Comments Capacity r. V Victor Road(A&A Club) Not reported One 33 inch diameter by 18 Repair/addition made to a 9/18/1953 foot deep seepage pit commercial system Henry's Place Victor Road, Not reported One 38 inch diameter by 22 Repair/addition made to a 6/28/1954 foot deep seepage pit commercial system V Victor Road,Back of Not reported One 15 foot leach line and Repair/ addition made to a Hardware Store,4/18/1957 one 36 inch diameter by 22 commercial system foot dee seepage pit The repair permits found in the vicinity were generally for the addition of leach lines and pits. /3.7 Expected On-Site Maximum Septic Tank Usage Please see section 3.4.1 of Part II,Nitrate Loading Study, for maximum septic tank usage. Septic system design should be based on the On-Site Wastewater Disposal Standards or other engineering recommendations. ` 4.0 GROUNDWATER 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 3-6),ground water lies between 50 and 60 feet below ground surface and flows at a gradient of about 20 feet per mile to the south-southwest in the vicinity of the Site. No ground water was encountered by the staff of Neil O.Anderson&Associates, Inc. during the drilling of a percolation test holes to a depth of three and a half feet on May 25, 2005. 4