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%owl �./ KLEINFELDER Given the above fact we estimate that -the facility would require an average waste/sewage flow o r 30,000 gal./week in orcQr to exceed the state drinking water standard for nitrogen (N) 0 &� dwater. 10. CONCLUSIONS ` The results of our percolation tests indicate that a suitable soil percolation stratum exists at the percolation test location at the SJCEHD approved depths tested of about 3 and 7 feet below existing site grade. A suitable soil condition is defined as a stratum capable of percolating water at a rate of 60 min/inch or faster at depths of 3'/z feet or shallower and 30 min/inch for deeper tests. Based on these results, it is our professional opinion that a conventional septic tank/leach trench sewage disposal system designed per SJCEHD criteria sou a e ua a serve the proposed residence and that there i no need for an en in stem to be installed at the 4 site. J Even though the estimated waste/septic flow and nitrate concentration of the leach field effluent value used in our calculations are probably conservative, we estimate that the potential nitrate-nitrogen (N) concentration in groundwater resulting from the new leach field should be below the state standard of 10 mgA. Farmington Lake is the nearest water body to the site and is located approximately 14.5 miles northeast of the property. Due to the distance to the lake and the depth and general gradient of groundwater, we anticipate that the impact to surface water will be low. 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. 43498.G01/ST05R1014 September 27,2005 ` Copyright 2005 Kleinfelder,Inc. Page 6 of 7