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Owner : Clyde Culbertson 13915 North Locust Tree Road Location : Across the road from site Septic : System is forty years old , no problems reported . 6 . Owner : Mark Woehl 13828 North Locust Tree Road Location : Adjacent and South of site Septic : System is ten years old , no problems reported . 7 . Owner : Martha Hieb 13972 North Locust Tree Road Location : This is the site Septic : System is thirty-five years old , no problems reported . GROUND WATER The owners agricultural well was sounded on June 25, 1991 with the depth to ground water recorded at 105 feet . During our interview with many of the neighbors, they indicated the depth to ground water was approximately 110 feet . The San Joaquin County Flood Control and Water Conservation Study, Fall 1985, indicated a Depth to Ground Water of approximately 90 to 100 feet (Exhibit 3) and a water gradient which fell about ten feet per mile in a southerly direction (Exhibit 4 ) . WATER Water samples were collected on November 18, 1991 by a representative of F .G.L . Laboratories and tested for DibromochloropropanL' (DBCP) and Nitrates . The results are included as Exhibits 5A and 59. The results show Nitrate levels at not detected and DBCP level at 0.05 ppb. SOILS AND PERCOLATION TESTS The "Soils of San Joaquin County , California" as published by the University of California indicates the predominant soils type at the site to be Greenfield Sandy Loam brownish in color with some red clay . Two six inch diameter by three foot deep percolation test holes were dug on the property . A percolation test was run on June b, 1991 under permit and inspection by San Joaquin Public Health Services. The location of the test holes and the test results are shown on Exhibit b .