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[4] Continued. <br /> The exploratory Log of Boring performed on the subject parcel <br /> illustrates the soil structure under the testing area, composed of <br /> silty sands and fine sand. The Log of Boring follows the <br /> percolation test data. <br /> The percolation tests conducted by Quality Control Inspection, Inc. <br /> were performed in accordance with San Joaquin Environmental Health <br /> Department regulations. The test results can be found in the <br /> Appendix. The percolation rate for the deep test boring (6 ft, 4 <br /> in) , was calculated to be 5. 7 minutes per inch. The shallow test <br /> boring (3 ft, 4 in) was calculated to be 30 minutes per inch. <br /> The predominate soil type encountered during the drilling to <br /> conduct the percolation tests was a silty-sand and fine sand <br /> formation. This predominate sandy soil structure produces a <br /> relatively fast percolation rate for sewage effluent as evidenced <br /> by the above percolation rates. In addition, the almond trees <br /> growing on the subject property are vigorous and producing very <br /> well , which is an indication of a well-drained soil . <br /> [5] LOCAL GROUNDWATER INFORMATION <br /> The 1991 "Lines of Equal Depth of Water in Wells" map produced by <br /> the San Joaquin County Flood Control and Water Conservation <br /> District indicates that the static water level is located at <br /> approximately 45 feet in the area of the subject parcel . The <br /> exploratory test boring drilled to a depth of 25 feet revealed <br /> moist soil , however, this is probably due to past irrigation <br /> practices. The groundwater flow according to the District maps <br /> appears to be towards the northeast, although many factors can <br /> influence this general groundwater directional flow. There is an <br /> irrigation well on the north border of the subject parcel which can <br /> be a primary factor in groundwater directional flow. <br /> 3 <br /> O +nlity Control Inspection <br /> a <br />