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003-040-07 Dewaine Perrin 3101 West Peltier Road Septic system was installed in 1938 and additional leach lines added about 20 years ago. Septic system doom fine. Groundwater is 20 to 25 feet GROUND WATER The San Joaquin County Flood Control and Water Conservation Study (1991) shows the depth to ground water at this location to be 30 feet. The gradient is interpolated to fall northerly toward the Mokelumne River. The slope is probably slight because of proximity to the Delta. See Exhibits 2 and 3. The owner engaged F.G.L. Laboratories to sample and test his water for nitrates and DHCP. The results of those tests are listed in Exhibits 4 and 5 . SOILS AND PERCOLATION TESTS Per the "Soils of San Joaquin County" as published by the University of California, the soil is predominantly Greenfield Sandy Loam. We encountered clay/loam and sandy clay while running the percolation tests . In the middle of May we attempted to run percolation tests on all three parcels, however, the testa on Parcels 1 and the Remainder did not pass . We then moved northerly nearer the river, expecting more porus soil and ran the testa again. The testa were run in a 6 inch diameter by 3 feet deep pit under permit and inspection by the San Joaquin County Health Department. The percolation rates are reported on Exhibits 6 and 7 . CONCLUSION Given the ground water depth, the historical success of aeptio systems in the are3a and the percolation results , I believe the site is suitable for septic systems. However, I believe the wide range of percolation rates (20 to over 60 minutes 1: r inch) is indicative to the area. Therefore, I recommend that 10 ,000 S .F. be reserved for leach aroma in the North half of the property and that any proposed septic system in the South half have a site sueoifio Deroolat_ion test.