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L L February 13,2007 NOA Project Number: E07010A L3.6 Septic Repair Permit History in the Vicinity LThe following septic system repair pemrits were found for the vicinity of the site during file review at EHD on January 4, 2007: Table 2. Vicinity Septic System Permit Summary Address,Date Capacity Lines,Length,Pits Comments j 27403 East Lone Tree Road 1200 gal Two,100'leach lines Repair/Addition 9-23-1975 One sump,4'x 8'x 10' The septic repair was for the addition of leach lines and a sump. L3.7 Expected On-Site Maximum Septic Tank Usage One primary residence and a secondary dwelling will be the maximum expecte se 'c tank usage for each lot on the subject property. Septic system design should be based on On-Site Wastewater Disposal Standards or other engineering recommendations. I V 4.0 GROUND WATER INFORMATION L4.1 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 determinethe ound water levels near the Site. The Fall 1998 and Spring 1999 maps are the most current offr s ay ' ble from the County. L According to these maps (Plates 3-6),ground water lies betwe n70 80 f' t below ground surface and flows at a gradient of about 10 feet per mile to the rth it in the vicinity of the Site. LNo ground water was encountered by the staff of Neil O.Anderson&Associates, Inc. during the drilling of percolation test holes to depths of approximately twenty-two feet on January 22, 2007. 4.2 Potential Ground Water Contamination Issues Identifying potential ground-water contamination sources was not part of the scope of work for the soil suitability study. Potential ground-water contamination can occur from a number of sources which often include leaky underground storage tanks, agricultural activities,dairies,septic systems and storm water infiltration. Agricultural activities,dairies and the use of septic systems in the area k 4 .,44 L