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KLEINFELDER SJCEHD, the last 30-minute reading of the four-hour period was recorded and used to calculate the percolation rate in minutes per inch. The estimated percolation rates are summarized below. Test Location Performed Depth (feet) Percolation Rate(min./inch) Number 3.4 15.6 P-2 5.7 25.0 Details of each test can be found on the field percolation test sheets. Copies of these sheets, signed by a representative from SJCEHD, are presented in the appendix. 7. CONCLUSIONS The results of our percolation tests indicate that a suitable soil percolation stratum exists in the area of percolation test P-2, which was located near the existing sump. A suitable soil condition for test approximately 3 to 3 % feet deep is defined as a stratum capable of percolating water at a rate of 60 min/inch or faster. A suitable soil condition for tests deeper than 3% feet is defined as a stratum capable of percolating water at a rate of 30 min/inch or faster. 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 J 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. y 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 document 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 site and off site) or other factors may change over time, and additional work may be required.with the passage of time. 44973.GO1/ST04R872 June 23,2004 ©2004 Kleinfelder,Inc. Page 5 of 6