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Water samples were obtained on 10/20/92 and transported to the FGL <br /> laboratory in Stockton to be analyzed for DBCP (dibromochloropropane ) <br /> and Nitrates . The results of those tests revealed that DBCP was <br /> detected at 2 . 88 ug/L ( the Maximum Concentration Level for DBCP is 0 . 2 <br /> ug/L , see appendix for method and detection limits ) and that Nitrate <br /> was detected at 21 mg/L ( the Maximum Concentration Level for Nitrate is <br /> 45 . 0 mg/ 1 ) . <br /> PERCOLATION TESTS <br /> Percolation tests were performed on all four of the subject parcels in <br /> accordance with San Joaquin County "PERCOLATION TEST PROCEDURE" , ( see <br /> appendix ) . Approximately an 8 ' diameters hole was excavated to a depth <br /> of 36" and filled with water 24 hours prior to running percolation <br /> tests . The test data, as recorded in the field , is enclosed in <br /> appendix . A portion of the test and the results were observed by a <br /> staff member of Environmental Health, as required by county procedure . <br /> The results show the parcels with a percolation rate of ; Parcel ( 1 ) 10 <br /> minutes per inch, Parcel ( 2 ) 13 . 3 minutes per inch, Parcel ( 3 ) 6 . 7 <br /> minutes to the inch, and Parcel ( 4 ) 8 minutes to the inch . <br /> The approximate location of the percolation tests are indicated on the <br /> tentative parcel map in the appendix . <br /> SOILS <br /> Soils data was obtained from the "Soil Survey of San Joaquin County, <br /> California" , dated October 1992 , written by the United States <br /> Department of Agriculture . <br /> The soils map indicates the predominant soils type is Bruella sandy <br /> loam, hard substratum, with some Bruella sandy loam along Peltier Road <br /> and the northwestern corner of Parcel 1 , for Parcel 1 and Parcel 2 . The <br /> predominant soil for Parcels 3 and 4 is Tokay fine sandy loam. These <br /> soils are all moderate to well drained , very deep soils , formed in <br /> alluvium derived from granitic rock sources . These soils are typically <br /> brown or grayish-brown on the surface layer ( approx . 19 inches deep) . <br /> The subsoil is grayish-brown , brown and pale brown fine sandy loam to a <br /> depth of 60 inches . <br /> Permeability is moderate in the Bruella soil both with and without <br /> substratum. While to permeability of the Tokay fine sandy loam is <br /> moderately rapid . <br /> CONCLUSION <br /> Based on the results of the percolation tests , soils information and <br /> the past performance of existing septic systems in the area, it is my <br /> opinion that the subject property is well suited for the continued use <br />