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R m KLEINFELDER EXPECT MORE As previously mentioned, a concentration of DBCP was not found in the groundwater in detectable amounts. The nearest water body to the site is the San Joaquin River, approximately 2 miles to the west. Due to the distance to the San Joaquin River and the general gradient of groundwater, we anticipate that the impact to surface water will be low. The concentration of nitrate-nitrogen (NO3) in the groundwater was below the state standard of 45 mg/I. Based on these results and the results of our nitrate loading calculations, we estimate that the potential nitrate-nitrogen concentration in groundwater, resulting from the proposed leach field, will not rise above the state standard. Even though the estimated waste/septic flow and nitrate concentration of the leach field effluent value used in our calculations are probably conservative, it is our professional opinion that a conventional septic tank/leach trench sewage disposal system designed per SJCEHD criteria will adequately serve the proposed Pilot Travel Center and that there is not a need for an engineered septic system to be installed at the site. 11. 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. 6. 82946.G01/ST07R401 lSJW:Ivllr May 30,2007 L ©2007 Kleinfelder Page 7 of 8