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f ' April 18, 2005 NOA Project Number: E05008B 3.6 Septic Repair Permit History in the Vicinity The following septic system repair permits were found for the vicinity of the Site during file review r at EHD on December 2, 2004: Table 2. Vicinity Se tic S stem Repair Permit Summary. Address,Date Tank Lines,Length,Pits Comments Capacity Fj Linne Road east of Hwy 33, Not reported One line 100 feet Addition of a leach line 10-20-66 1 Linne Road 2 mi east of Hwy Not reported One line 25 feet,one Addition of one leach line and one 33,6-28-67 pit 4 by 4 by 8 feet pit deep Linne Road 2 mi east of Hwy 800 gal Two lines 30 feet Repair of an old system 33,7-21-67 Fi� 28113 South Banta Road Not reported Addition of one 4 by Repair/addition of system 10 by 7 foot sum The repair permits found during the file review.are mostly for the addition or repair of leach lines _ and pits. 3.7 Expected On-Site Maximum Septic Tank Usage Maximum expected usage on each proposed parcel would be for a primary residence and second dwelling unit. Septic system design should be based on the On-Site Wastewater Disposal Standards or F1 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 maps available from the county. Examination of these maps indicates that no water level data is available for the Tracy/Banta area, which includes the Site, and no definite comments as to depth or gradient flow direction can be made. However,'based on our experience in the area, out office estimates that, at its shallowest, the ground water in the area lies 10 to 15 feet below the ground surface. 4