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CHASE AND FLOYD DUE PROPERTY PAGE NO. 3 results indicate DBCP was not detected and the level of nitrates to be 77 mg/l, which is above the Maximum Contaminate Level (MCL) of 45 mg/l . VI. SOIL PROFILE AND PERCOLATION TESTS A total of 4 test holes were excavated to a depth 10 feet in the areas of the existing and proposed home sites in order to determine the soil profile in the general area. For approximate location of the test holes (PT) see the Tentative Parcel Map in the Appendix. The soil profile test holes were logged by an engineer and a description of the soils encountered in each hole is contained in the Appendix. The surface soils consisted of a silty fine to medium sand. Slightly cemented material was encountered at a depth of 3 . 5 to 4. 5 feet. This was underlain by various strata of silty sand and sandy silt. Percolation tests were performed in the surface silty sand stratum. For a more detailed description of - the soils encountered see the log of test holes. A shallow percolation test was performed at each of the test hole locations. Eight inch diameter by 36 inch deep test holes were excavated for each test. Two inches of gravel was placed in the bottom of each hole. A 3 inch diameter perforated pipe was then placed in each hole and backfilled with gravel. Each of the tests holes were filled with water 24 hours prior to running the tests. The last half hour of the tests readings were witnessed by a county health official and the test data obtained is enclosed in the appendix. The percolation rates have been adjusted to account for the gravel and pipe backfill. Calculations for adjustments are on the test data sheets. A summary of the test results is presented next: Diameter of Depth of Test No. Hole (in.) Hole (in. ) Percolation Rate (min/in) PT-1 8 36 4. 2 PT-2 8 36 23 PT-3 8 36 17 PT-4 8 36 4. 9 As indicated, the percolation test were shallow ones. Although the percolation rates were fairly good, it is recommended that deep pits be used in conjunction with the shallow leach lines due to the presence of the cemented stratum that exists 3 . 5 to 4. 5 feet below the surface. ?OERS a �+ z JU o � P 4SSoG�