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KLEINFELDER 8. CONCLUSIONS The results of our soil classification boring and soil suitability tests indicate that a stratum of silty sand underlies the new leach field area from a depth of about 19 to 25 feet that exhibits suitable soil percolation characteristics for disposal p al of waste/septic flow. The overlying shallow clay did not exhibit suitable soil percolation characteristics. Based on our previous experience, intermediate silt and clay encountered will most likely not exhibit suitable soil percolation characteristics. For reference; a suitable soil stratum is defined by SJCEHD as a soil stratum capable of percolating water at a rate of 60 minutes per inch (min/inch) within the upper 3.5 feet of site grade or 30 min/inch ` for deeper tests. Accordingly, the new sewage disposal system will g P Y need to consist of a leach field employing seepage pits that extend into the silty sand stratum and are designed in accordance with the San Joaquin County Sewage Standards. The septic tank for the new disposal system will P y also need to be sized in accordance with the San Joaquin County Sewage Standards. As previously discussed, we calculate 4.73 mg/1 of nitrate-nitrogenen (N) i n groundwater resulting from the proposed leach fields, a result that is below the state drinking water standard of 10 mg/l. Based on this level of nitrate-nitrogen and the depth to 7N, groundwater (greater than 70 feet), we anticipate that the impact on surrounding wells will be low. Calaveras River is the nearest water body to the site and is located approximately 700 feet north of the property. Due to the distance to Calaveras River and the depth and general gradient of groundwater, we anticipate that the impact to surface water will be low. 9. LIMITATIONS Kleinfelder has prepared this report in accordance with theenerall ted g Y 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. r Different professionals may reasonably adapt different approaches to similar problems. Therefore, no warranty or guarantee, expressed or implied, will be included in Kleinfelder's scope of service. Er 56995.G0IIST05R823 August 30,2005 Q 2005 Kleinfelder,Inc. Page 7 of 8 f