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February 22,2006 NOA Project Number: E06010A Address,Date Tank Capacity Description 14000 N.Clements Rd. --- Addition of one 40'leach line and one 48" diameter by 25' 7-16-01 deep seepage pit to existing residential-s-stern It appears that many systems in the area have required the addition of new leach lines and seepage Pits. j ! /3.7 Expected On-Site Maximum Septic Tank Usage Maximum expected septic usage on the property would be for the existing residence, a potential second dwelling unit, and the proposed winery. According to information on file at the San Joaquin County Planning Department, 22 employees per day are anticipated Monday through Friday, and eight employees per day are anticipated for Saturday and Sunday. Ten customers per day are anticipated on the weekend only. Ten trucks for wine product are anticipated to enter the facility per day. Septic system design should be based on the On-Site Wastewater Disposal Standards or 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 official maps available from the County. According to these maps_CPlates 4-7),glound water lies between 160 and 180 feet below ound t surface. For fall 1998,ground water appears to flow to the west-southwest ata gradient of t approximately 5 feetper mile in the vicinily of the Site; the Qtadient is uncle r No ground water was encountered by the staff of Neil O. Anderson&Associates, Inc. during the drilling of the deep percolation test hole to a depth of approximately 25 feet on February 10, 2006. /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. Any past agricultural activities and the present use of septic systems in the area should be considered potential ground water contamination sources. 1 ] �� 5