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5 . Owner : Estebon Castaneda Address: 12858 East Tokay Colony Road Location : Immediately East of site Septic : Eight to ten years old All the above reported no problems with their leach fields. The reason a new system was constructed on Parcel One was that the old system was composed of a redwood tank . It was ancient and inadequate. When the house was remodeled he installed a completely new system. GROUND WATER All the wells we found in the area were submersible with the exception of an agricultural well on A.P.N. 063-210-13 and it did not have a sounding tube. No soundings were made to determine the water table. All the people previously listed as interviewed had no idea of the depth to ground water except Mr . Baumgarten who believed it to be sixty feet deep. From the San Joaquin County Flood Control and Water Conservation Study, we found that the actual ground water depth below ground was approximately 100 feet deep ( Exhibit 2) and the water gradient was southerly and fell approximately seven feet per mile ( Exhibit 3) . In containers supplied by F .G.L . Laboratories we took a tap water sample at the site. The results are shown on Exhibit 4 . The laboratory found that the water contained 43 mg/ l of nitrates and the State allowable concentration is 45 mg/l , Mr . Harris was notified of this by phone 2/7/91 . SOILS AND PERCOLATION TESTS Per the "Soils of San Joaquin County" as published by the University of California, the soil is Landlow adobe clay and Wyman clay, poorly drained . We encountered a dark brown , difficult to dig clay. On January the 23rd we ran percolation tests as shown on Exhibit 5. The test for Parcel 1 was passed , but the one for Parcel 2 failed . On January the 30th, Parcel 2 was retested and passed , see Exhibit 6. In all cases, three tests, the test holes were six inches in diameter and three feet deep. All tests were run under permit and inspection by the San Joaquin County Health Department .