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07/1V20013 08:25 FAX �012/02B :. n calculations, we estimate that the potential nitrate-nitrogen concentration in groundwater, resulting from both the existing and new leach fields, will stay above the state standard of 10 mg/I. The San Joaquin River is the nearest water body to the site and is located approximately 2'/4 miles west of the property. Due to the distance to the Sar: €oaquin River and the general gradient of groundwater, we anticipate that the impact to surface water will be low. Due to the fast percolation characteristics of the subgrade soil, the depth to groundwater, and the already high nitrate-nitrogen (N) concentration, it is our professional opinion that a conventional septic tank/leach trench sewage disposal system designed per SJCEHD criteria will not adequately sena the proposed temple and that there is a need for a modified standard septic system to be installer) at the site. The modified septic system should attempt to slow the percolation rate of the effluent from the septic tank/leach field system into the soil. In our professional opinion, the percoiation rate of the effluent can be slowed by using at least 6 inches of peat/compost in the filter beds of the septic tank/leach field system. Peat/compost has slow percolation characteristics that will help prevent effluent from quickiy percolating f out of the septic system and into the soil and groundwater. Additionally peat/compost tends to also have a high organic content that will help denitrify the effluent. 11. LIMITATIONS I I 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 definiVon 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 anti/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 prcjj ct area. It was assumed that the percolation test resu=ts are representative of the subsurface conditions in the general area. No warranty, expressed or implied, is made. Regulations and professional standards applicable to Kleunfelder's services are continually evolving. Techniques are, by necessity. often new and relatively Untried. Oifferefil( 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, 71324-,G011,3TOSR750 July 13,200C, Cot:yf ight 2006 Kleinfelder,inc. Page 8 of 9