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`. filled with water 24 hours prior to running percolation tests . The test data, as recorded in the field, is enclosed in appendix . A portion of the test and the results were observed by a staff member of Environmental Health, as required by county procedure . The results show the parcels with a percolation rate of ; Parcel ( 1 ) 13 . 4 minutes per inch , Parcel ( 2 ) 13 . 4 minutes per inch, Parcel ( 3 ) 2 . 8 minutes to the inch, Parcel ( 4 ) 10 minutes to the inch,and the designated remainder 10 minutes to the inch . The approximate location of the percolation tests are indicated on the tentative parcel map in the appendix . SOILS Soils data was obtained from the "Soil Survey of San Joaquin County, California" , dated October 1992 , written by the United States Department of Agriculture . The soils map indicates the predominant soils type is Bruella sandy loam for parcels 1 , 2 and the remainder and Kingdon fine sandy loam for parcels 3 and 4 as well as the northwest portion of the remainder . These soils are all well drained, very deep soils , formed in alluvium derived from granitic rock sources . These soils are typically brown or grayish-brown on the surface layer ( approx . 19 inches deep ) . The subsoil is grayish-brown, brown and pale brown fine sandy loam to a L depth of 60 inches . Permeability is moderately slow in the Bruella soil . The permeability is moderate in the Kingdon soil . CONCLUSION Based on the results of the percolation tests , soils information and the past performance of existing septic systems in the area, it is my opinion that the subject property is well suited for the use of on-site sewage disposal systems . The on-site sewage disposal system shall conform with San Joaquin County Environmental Health Divisions "Sewage Standards" . Section 10 . 3 . 3 of these standards , requires a minimum 6 ,000 square feet of disposal area for each parcel shall be set aside for the future expansion area . This area shall not be built over or covered with asphalt or concrete . In addition the leach field shall not be driven over or parked on. It should be noted that percolation tests were performed on the southern and eastern sides of parcel 3 that did not meet the requirements for a standard sewage disposal system under the current sewage standards . Therefore , if the sewage system is not located in the area tested, additional tests should be performed to insure a proper system operation .