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flood plain maps . It would be unfruitful to "guess" at their possible outcome . Water samples were obtained on 9/5/95 at approximately 11 : 00 and transported to the FGL laboratory in Stockton to be analyzed for DBCP ( dibromochloropropane ) and Nitrates . The results of those tests revealed that DBCP was not detected ( see appendix for method and detection limits ) and that Nitrate was detected at 9 . 8 mg/1 ( the Maximum Concentration Level for Nitrate is 45 . 0 mg/1 ) . PERCOLATION TESTS Percolation tests were performed on all four of the subject parcels in accordance with San Joaquin County "PERCOLATION TEST PROCEDURE" , ( see appendix ) . Approximately an 8" diameter hole was excavated to a depth of 36" and 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 ) 4 . 2 minutes per inch , Parcel ( 2 ) 7 . 3 minutes per inch, Parcel ( 3 ) 5 . 0 minutes to the inch, and Parcel ( 4 ) 5 . 3 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 Tokay fine sandy loam, with some Kingdon fine sandy loam along Peltier Road and the northeastern corner of Parcel 1 , along Peltier , there is a small intrusion of Bruella sandy loam. 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 about 26 inches deep . The substratum is a pale brown fine sandy loam to a depth of 60 inches . Permeability is moderately rapid in the Tokay soil . The permeability is moderately slow in the Bruella soil . The permeability is moderate in the Kingdon soil .