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VI. SOIL PROFILE AND PERCOLATION TESTS A test pit was excavated to a depth of 10.0 feet adjacent to the existing leach line for the Baglietto residence. The purpose of the test pit was to determine the soil profile in the general area. For approximate location of the test pit, see the Tentative Parcel Map in the Appendix. The test pit was excavated with a Cat 416 backhoe equipped with a 24 inch bucket. Visual classification of each soil stratum encountered was made in the field by a civil engineer at the time the test pit was excavated. A description of each soil encountered is presented in the Appendix as Log of Test Pits. Generally the soils encountered in the test pit consisted of a sandy to clayey silt in the upper 8.5 feet and a slightly silty fine sand below that. For a more detailed description of the soils encountered see the Log of Test Pits. The surface silt stratum should provide a fair percolating stratum. A percolation test was performed adjacent to the existing leach line. For approximate location of the percolation test see the Tentative Parcel Map in the Appendix. The percolation test was performed in an 8 inch diameter by 36 deep test hole. A 3 inch diameter perforated pipe measuring device was placed in the test hole and backfilled with 3/4 inch gravel. The test hole was filled with water 24 hours prior to running the test. The last ten minutes of the test readings were confirmed by a San Joaquin County health official and the test data obtained is contained in the Appendix. The results of the test indicate that the soil had a percolation rate of 9.6 minutes/inch. VII CONCLUSION Based on the results of the percolation tests, the soil profile, and the past performance of the existing Baglietto and surrounding septic systems, it is our opinion that the subject property should be suitable for continued use of an on-site sewage disposal system. Although the present Baglietto system is functioning, its age makes its continued use uncertain. Should a new system be required the subject property, as indicated, is conducive for the construction of a typical on site sewage disposal system. Any proposed system however, should be properly designed and installed according to current San Joaquin County criteria. It should be noted that the location of the percolation test was near the existing leach line. Although it is not anticipated that soil conditions vary greatly over the immediate area, if the location of any proposed replacement system varies significantly from the test location, the test data should not be considered accurate of other locations. 06-1�e _ 4