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kTJ KLEINFELDER The results of the percolation tests indicate that a suitable soil percolation stratum exists at a depth of 14.5' on parcel 012-030-51, 18.5' on parcel 012-030-50, and 39" on parcel 012-030-48. A suitable soil condition for tests deeper than 3'/2 feet is defined as a stratum capable of percolating water at a rate of 30 min/inch or faster. Based on these results, conventional septic tank/leach trench sewage disposal systems designed per SJCEHD criteria can be used to serve the proposed residences constructed on these lots. Seepage pits should extend into the soil strata in which the passing percolation rates were obtained. We recommend that new homeowners be made aware of the difficult percolation characteristics of the near surface soils at the site. Reference is made to several suggestions in the Chesney Consulting report in Appendix A to extend the life of the new disposal systems. Based on these results .we do not anticipate a ne-ec...fQL-eW.ineered._-ystems.to be installed at the residentialparcels. 7. 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 57556.G01/ST05R687R August 25,2005 ©2005 Kleinfelder, Inc. Page 4 of 5