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k'g KLEINFELDER The results of percolation test P-3 located in the proposed Parcel 3 indicates that a suitable soil percolation stratum exists atdepths ranging of about 12.3 feet below the existing ground surface at the location tested. A suitable soil condition for tests deeper than about 3V2 feet is defined as a stratum capable of percolating water at a rate of 30 min/inch or faster. Based on the results of our testing, a conventional septic tank/leach trench sewage disposal system with seepage pits designed per SJCEHD criteria should adequately serve the proposed residence. The seepage pits should extend into the soils that were encountered at depth tested. The shallow and deep percolation tests at location P-1 performed in the proposed Parcel 1 did not meet the required percolation rates at the location tested. Based on this result, we anticipate that a mounded sewage disposal system may be necessary for a new home constructed in Parcel 1. 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 information provided regarding the existing and proposed development and on- site conditions as well as our field observations, percolation test results, and experience in the project area. It was assumed that the percolation test results are representative of the subsurface conditions in the general area. No warranty, expressed or implied, is made. Regulations and professional standards applicable to Kleinfelder's services are continually evolving. Techniques are, by necessity, often new and relatively untried. Different professionals may reasonably adopt different approaches to similar problems. Therefore, no warranty or guarantee, expressed or implied, will be included in Kleinfelder's scope of service. Kleinfelder will assume no responsibility or liability whatsoever for any claim, loss of property value, damage, or injury that results from pre-existing hazardous materials being encountered or present on the project site, or from the discovery of such hazardous materials. This report may be used only by the client and only for the purposes stated, within a reasonable time from its issuance. Land use, site conditions (both on- and off-site) or other factors may change over time, and additional work may be required. Based on the intended use of the 42270.G01/ST041383 October 15,2004 ©2004 Kleinfelder, Inc. Page 5 of 6