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SILVERA PROPERTY, SOIL SUITABILITY STUDY Page No. 5 the parcel. Consequently a test pit and percolation test were done at this location. The soil profile encountered in the test pit indicate a very favorable profile for the use of a leach field (a 3.0 foot sand stratum, from 1.0 to 4.0 feet, underlaid by a 2.0 foot clay stratum). The percolation test results show a very good percolation rate of 2.0 min/inch. Consequently, it is our opinion that this location would be well suited for the construction of a typical septic system, however, the same concerns with heavy rains as previously mentioned would apply. Ground water depth encountered in the test pit at this location is slightly lower (7.5 feet) then that encountered in the other test pits. This is apparently due to the elevation of the subject property being slightly higher along the center and decreasing as you approach the north and south edges. Due to the lower ground water and the clay stratum encountered from 4.0 to 6.0 feet, it is our opinion that construction of a typical septic system would not adversely affect the quality of ground water in the area. Parcels #2 and #3 As with Parcel #1, there is no proposed development for a homesite on either of these parcels at this time. However, in consideration of future use, test pits were excavated in the SW corner of both parcels which is along the southern edge of the subject property. These areas do not appear favorable for construction of a typical septic system. This is due both to the lack of a suitable percolating stratum and relatively high ground water. If homesites are ever proposed in these locations, it is recommended that an above ground mound system or other suitable alternative be considered. A more favorable location for home sites, as far as construction of a typical septic system is concerned, would appear to be along the northern edge of the parcels, where ground elevations are slightly higher. A site specific soil mantle and percolation test should be performed, however, before locations are selected. Any proposed on site septic system, whether replacement or new, should be properly designed and installed according to current San Joaquin County criteria. It should be noted that the opinions stated regarding the effect of any existing or proposed septic systems on the quality of ground water in the area were also based on the relatively low density of potential development of one dwelling per 40 acres. It should also be noted that soil profiles appear to vary significantly throughout the subject property. The soil profiles encountered in the test pits and the percolation test performed should only be considered indicative of the location in the immediate area o R So s 'L W Q ~ P 9SS 0 G�