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ra a i iiia o loon riuxixr� i.nn i n . e. �� x Page 2 San Joaquin County Public Health Services Subject: Minor Subdivision Application No. MS 01-17 Soil Suitability Study III. PROPERTY HISTORY The property historically has been used for walnut orchards. Approximately thrce-quarters of the property are currently planted with walnut trees, with the remaining quarter where the house is located sitting fallow. The house is currently on a septic system that sits approximately twenty-five feet west of the house with leach lines running westward. Two wells, one for-irrigation and one for domestic use, are located to the north of the home. There have been no problems with the current septic system or the wells. 1 x The neighboring parcels are also currently used for agriculture, with walnut trees as the dominant crop. There have been no problems reported with the existing septic systems used on these neighboring parcels. IV. SOIL PROFILE The topographic soils map prepared by the United States Department of Agriculture, Soils Conservation Service, indicates the site is largely covered by Cogna Loam with smaller areas covered by Archerdale Clay Loam. Visual inspection of the soil strata from the percolation test holes confirms the soils are a loose packed, grainy soil with slight cohesive properties. The latest San Joaquin County Water Conservation District Maps reveal that the standing water level of the subject site to be at a depth of approximately one hundred ten feet (110'). This relates to a groundwater elevation of approximately negative thirty-five feet (-35'). The existing domestic well draws water from approximately 100'. Water samples drawn from the well at 10.30 a.m. on August 7, 2001 were tested for nitrates and dibromochloropropane (DBCP) at a State certified laboratory. A copy of the test results is attached. The nitrate and DBCP levels were both below the Maximum Contaminate Level (MCL). V. PERCOLATION TESTS Percolation tests were performed on August 6, 2001, according to the testing criteria established by San Joaquin County Environmental Health. The observed percolation rates for the four (4) test holes were 3.25 minutes per inch, 4.34 minutes per.:inch, 3.60 minutes per inch, and 4.39 minutes per inch, respectively. Attached is a copy of the test log and soil boring location map. fAOI130V-"2.doC NGINEERING n.