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Mr.Jadi Singh ` January 24,2003 Job Number:LE02481 Page 5 conditions encountered within the six shallow percolation test borings and double ring infiltrometer test areas. Table 1. r 14-foot deep ground water boring log. Soil Soil Description(USCS) Comments Depth feet 0-1 Dk bm silty f-m sand,loose(SW). Contains brick fragments—fill.Percolation rate is slow to moderate. 1-2 Lt brn silty f-m sand,loose(SW). Percolation rate slow to moderate. 2-4 Brn f-m sand,dense(w/some silt)(SP). Percolation rate rapid to very rapid ` 4-8 Brn f-m sand,clean slightly cemented(SP). 8-9 Brn Ura sandy silt,slightly moist(ML). ` 9-10 Bm silty Um sand,slightly moist(SP). 10-13 Brn silty clay w/Urn sand(CL). Ground water depth measured at 11.85 feet bgs. 13-14 Brn f-m sandy silt(ML). I Total depth of exploratory boring is 14 feet. --bgs is below ground surface,bm is brown,f is fine size sand,m is medium size sand. 4.2 Historic Ground Water Levels The San Joaquin County Flood Control and Water Conservation District ground-water depth and elevation maps were reviewed to determine the ground water levels at the site(SJCFCWCD, 1999). The Fall 1998 and Spring 1999 maps are the most recent maps available from the r County. According to the Fall 1998 depth to ground water map,the depth to ground water below the site was between 10 to 20 feet. The depth to ground water for Spring 1999 was less than 10 feet. The gradient and flow direction could not be determined due to the lack of contours on the map. The depth to ground water was measured on the site in the deep ground water boring drilled by Neil O. Anderson&Associates, Inc. on November 22, 2002 (Plate 1). The level was allowed to stabilize for approximately 30 minutes. The depth of ground water below the ground surface was found to be 11.85 feet. +pfft0 � L 2 t,�f♦