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.. GREWAL & BACCHETTI PROPERTY Page No. 3 VI . SOIL PROFILE AND PERCOLATION TESTS Three, 10 foot deep test holes were excavated by hand in the area of the proposed homesites in order to determine the soil profile in the general area. For approximate location of the test holes (PT) see the Parcel Map in the Appendix. The tests holes were logged by a civil engineer and a description of the soils .� encountered in each test hole is contained in the Appendix. The soils encountered in the test holes consisted predominately of interbeded layers of silty sand and sandy silt. For a more ` detailed description of the soils encountered see the log of test holes. Three 36 inch deep by 8 inch diameter test hole were excavated by hand adjacent to the soil profile holes for performing shallow percolation tests. 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. Test 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 23 PT-2 8 36 23 PT-3 8 36 59 VII CONCLUSION Based on the results of the shallow percolation tests, the soil profile, and the performance of the septic system in the area, it is our opinion that the proposed homesites resulting from the proposed parcel splits should be suitable for use of on site sewage disposal systems consisting of septic tanks and shallow leach r lines. The proposed systems however, should be properly designed and installed according to current San Joaquin County criteria. Y pERY H s ` 1 W O � 'SSO G\ P V