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n <br /> September 30,2007 <br /> NOA Project Number. F-07146A <br /> k-1.6 Septic System Repair Permit History in the Vicinity <br /> J The septic system repair permits in the vicinity appear to be for the addition of leach lines and <br /> n seepage pits. <br /> ' J ✓3.7 Expected On-Site Maximum Septic Tank Usage <br /> r <br /> Maximum 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 /> �y days per week. There will be two employees. Septic system design should be based on the On-Site <br /> 1 Wastewater Disposal Standards or other engineering recommendations. <br /> 4.0 GROUND WATER INFORMATION <br /> A4.1 Ground Water Depth and Gradient <br /> The San Joaquin County Flood Control and Water Conservation District(1998 and 1999) ground <br /> q water depth and elevation maps were reviewed to determine the ground water levels near the site. <br /> I , 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 /> surface and flows at a gradient of about 10 feet per mile to the northwest in the vicinity of the site. <br /> R4.2 Potential Ground Water Contamination Issues <br /> I l 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 /> —4.4 Water Sample Constituents <br /> The water sample was analyzed for nitrate and DBCP. Nitrate was found a �7�%L!NO3 below <br /> the.maximum contaminant level (MCL) set by the US EPA of 45 mg/L-NO3.JbBC-P.ww s not? <br /> vbo 'I the well water sample.The analytical reports prepared by FGL Environmental can <br /> be'found in the appendix of this report. <br /> 4 <br /> Fl <br /> F3 <br />