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k'q KLEINFELDER Test Number Performed Depth, Feet Percolation Rate, Minutes/Inch P-1 3.40 13.6 9.90 Failed P-2 3.30 15.63 10.0 Failed P-3 3.40 Failed 12.30 22.73 - 7. CONCLUSIONS The results of percolation tests P-1 and P-2 in proposed Parcels 1 and 2 indicate that the near-surface soils (at a depth of about 3.4 and 3.30 feet, respectively) exhibit suitable percolation characteristics at the locations tested. A suitable soil condition for a test at this depth is defined as a stratum capable of percolating water at a rate of 60 minutes/inch or faster. Based on this result, a conventional septic tank/leach trench sewage disposal system designed per SJCEHD criteria should adequately serve the proposed residence. The results of percolation test P-3 located in the proposed Parcel 3 indicate that a suitable soil percolation stratum exists at a depth of about 12.30 feet below the existing ground surface at the location tested. A suitable soil condition for tests deeper than about 3'/2 feet is defined as a stratum capable of percolating water at a rate of 30 minutes/inch or faster. Based on the results of our testing, a conventional septic tank/leach trench sewage disposal system with s__eepa_ge pits designed per SjQEHD criteria should adequately serve the proposed residence. The seepage pits should extend into the soils that were encountered at the depth tested. These recommendations regarding the type of sewage disposal system appropriate for the proposed residences are for estimating purposes and are based on the specific locations tested. Once the locations of the proposed residences and associated sewage disposal systems are finalized, percolation tests should be run in the area of the proposed leach field areas. Results of the tests in the leach field areas should be used for final design of the proposed systems. 8. LIMITATIONS Kleinfelder has prepared this report in accordance with the generally accepted standards of care that exist in San Joaquin County at the time of writing. It should be recognized that definition and evaluation of geologic and chemical subsurface conditions are difficult. Judgments leading to conclusions and recommendations are generally made with an incomplete knowledge of the subsurface and/or historic conditions applicable to the site. The conclusions of this report are based on the 42270.G01/ST051322 October 21,2005 ©2005 Kleinfelder,Inc. Page 4 of 5