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[4] Continued. the subsurface soils most likely possess an alluvial structure nearest the river banks. The Soil Survey Map of San Joaquin County indicates the subject property soil is a Columbia fine sandy loam. The soil description along with the map can be found in the Appendix. Permeability is moderately rapid in this type of soil , although it is possible for water to become perched in a stratified substratum after heavy rainfall or irrigation. The percolation tests conducted by Quality Control Inspection, Inc. were performed in accordance with San Joaquin Environmental Health Department regulations. A shallow percolation test was performed on Parcel No. 1 and the DR. Deep percolation tests were not performed on the two parcels since the encountered soil material during the boring procedures at the shallow depth was very conducive to favorable percolation rates. The percolation test results for the two shallow test borings (42 in) were 1. 7 min/in for Parcel No. 1 and 2 . 7 min/in for the DR. The last reading for the DR illustrates a probable soil saturation condition. The predominate soil type encountered during the test hole drilling was a silty-sand and fine sand formation. This sandy soil structure produces a relatively fast percolation rate for sewage effluent as evidenced by the above percolation rates. In addition, the walnut trees growing on the subject property appeared to be in good health, which is one indication of a well-drained soil . [5] LOCAL GROUNDWATER INFORMATION The Spring 1992 "Lines of Equal Depth of Water in Wells" map produced by the San Joaquin County Flood Control and Water Conservation District indicates that the static water level is located over 100 feet below grade in the area of the subject property. It is difficult to determine the groundwater gradient according to the District maps, although the flow direction is 3