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September 30, 2007 <br /> NOA Project Number: E07146A <br /> PJ.6 Septic System Repair Permit History in the Vicinity <br /> The septic system repair permits in the vicinity appear to be for the addition of leach lines and <br /> seepage pits. <br /> ,-3.7 Expected On-Site Maximum Septic Tank Usage <br /> RMaximum expected usage for the proposed development will be for a wine tasting room which is <br /> expected to have a maximum of approximately 10 customers per day, 12:00 pm to 5:00 pm, five <br /> days per week. There will be two employees. Septic system design should be based on the Orr-Site <br /> RWastewater Disposal Standards or other engineering recommendations. <br /> F1 4.0 GROUND WATER INFORMATION <br /> �.1 Ground Water Depth and Gradient <br /> F <br /> The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground <br /> water depth and elevation maps were reviewed to determine the ground water levels near the site. <br /> P , The Fall 1998 and Spring 1999 maps are the most current official maps available from the County. <br /> According to these maps (Plates 3-6),ground water lies between 70 and 85 feet below ground <br /> I1surface and flows at a gradient of about 10 feet per mile to the northwest in the vicinity of the site. <br /> ,4.2 Potential Ground Water Contamination Issues <br /> } Identifying potential ground-water contamination sources was not part of the scope of work for the <br /> soil suitability study. Potential ground-water contamination can occur from a number of sources <br /> which often include leaky underground storage tanks, agricultural activities, dairies, septic systems, <br /> and storm water infiltration. Agricultural activities, dairies and the use of septic systems in the area <br /> should be considered potential ground-water contamination sources. <br /> 4.3 Water Sample Location <br /> According to the owner, one well exists on the site. No well permit was found for the well. A water <br /> sample was taken from the well head of the domestic well by Mr.Jessen Welch of our office on <br /> September 4, 2007. <br /> Fr4.4 Water Sample Constituents <br /> The water sample was analyzed for nitrate and DBCP. Nitrate was found at'C.9.mg/L�'NO3 below <br /> the-maximum contaminant level (MCL) set by the US EPA of 45 mg/L-NO3.DBC-P,was not; <br /> encountered'in the well water sample. The analytical reports prepared by FGL Environmental can <br /> be ound in the appendix of this report. <br /> F <br /> 4 <br /> F-! <br />