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L LJune 1, 2006 NOA Project Number: E05148B L4.0 GROUND WATER INFORMATION 4.1 Ground Water Depth and Gradient LThe 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 s aJ are the most current official ti s, ble from the County. �' According to these maps fates 3-G ,ground water lies betwee 60 and 80 et below ground surfac s at a gra -of about 10 feet per mile to the trtii in vicinity of the Site. LNo ground was encountered by the staff of Neil O. Anderson&Associates, Inc. during the drilling three deep percolation test holes to a depth of 25 feet on May 11, 2006. i L 4.2 Potential Ground Water Contamination Issues L Identifying potential ground-water contamination sources was not part of the scope of work for the soil suitability study. A Surface and Subsurface Contamination Report addressed this issue (NOA, 2005). Please refer to this report for descriptions. Potential ground-water contamination can occur L 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 should be considered potential ground-water contamination Lsources. 4.3 Water Sample Location LAccording to Mrs. Knowles,no wells exist on the subject property. No well permits were found for the Site during file review at EHD on January 15,2006. No well water sample was taken for the Lsubject property. 4.4 Water Sample Constituents LNo wells exists on the subject property. No well water sample was taken. j 6. 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION L The Site is depicted on the USGS Preliminary Geologic Map of San Francisco - San Jose Quadrangle as within the Quaternary Riverbank Formation. Quaternary Riverbank Formation- weathered reddish gravel, sand,and silt forming clearly recognizable alluvial terraces and f (Plate L 7)- L 4 L '--44 L