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i <br /> July 24,2003 <br /> Job Number:,LG03-206 <br /> r Page s <br /> Table 3. <br /> Selected Soil Properties of the Surrounding Area <br /> San Joaquin County Soil;Survey Report. <br /> rSoil Name and Map Depth(in) Unified-Soil Salinity Soil. Septic tank <br /> Symbol Classification mmhoslem Reaction absorption <br /> pH fields <br /> Tokay fuze sandy 0-19:Fine sandy ' SNl <2 6.1 -7.8 Slight. <br /> " loam,0 to 2 percent loam. <br /> slopes,256. 19-45:Fine sandy SM <2 6.1 :7.8 <br /> loam,sandy loam. <br /> 45-60:Fine sandy- SM <2 6.1 -8.4 <br /> loam,sandy loam; <br /> coarse sanL loam. _ <br /> Note: The table descriptions do not necessarily reflect site-specifte soil properties. <br /> One, "shallow"3-foot,percolation test boring and one"deep" 12.65-foot percolation test boring•." <br /> were drilled on June 24, 2003 in an area designated on the site plan (Plate 1). The two <br /> percolation test holes,were drilled using a truck mounted Deep.Rock auger,rig. The surface soils <br /> encountered were a brown fine to medium sandy clay to a depth of 4 feet. Auger'grab samples . <br /> indicated that below'the surface soil was sandy silt and silty sand layers extending,to,a depth of <br /> 12.feet. A brown fine tomedium sand was encountered at a depth of 12 feet and extended to the . <br /> = total depth of the hole which was.13 feet. <br /> Generally,the soil encountered in the boring is similar to the soils reported by the San Joaquin <br /> County Soil Survey soil for the area(USDA, 1993). <br /> .'A percolation test measures the permeability of the soil by observing the water drop over a period <br /> of time which is an indicator of how much area will be required for the septic system: The water <br /> drop was observed within the boring-by using PVC pipe and gravel. Approximately 2 inches-of, <br /> 'pea gravel"was placed in the bottom of the boring then a slotted 2-inch diameter PVC pipe was <br /> installed on top of the gravel..Several feet of"pea gravel"was backfilled in the annular space. <br /> Presaturation of the percolation test hole occurred on June 24; 2003. Measurement of themater <br /> r level during the percolation test,was from.a fixed reference'point on the PVC casing using an <br /> 6'• L electric well sounder.with a depth accuracy of 11100th,foot. All values on the field data sheet are' <br /> in decimal feet. <br /> ' c ation test was conducted for the"shallow"percolation test'on June 25 2003 and <br /> A,4-hour per of p , <br /> ' a 1 hour percolation test was performed within the 12.65 foot "deep"percolation test hole in <br />