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4� v Nitrate loading can also occur from lawns/landscaping/gardens, which is estimated to be 20% and could be significantly higher. Home purchasers should use "slow-release" nitrogen fertilizers to reduce nitrate loading from lawns, etc. Contemporary scientific literature suggests that denitrification may be enhanced by placing proposed leachlines higher in elevation toward the soil surface. This would be advantageous since the surface soils consist of approximately 20% of the fine soil fraction (silts and clays). Deciduous and evergreen plants may be planted near the leachfield to uptake ammonium and nitrate ions. Caution must be given to prevent serious root infiltration into the leachlines. These two procedures would theoretically provide a triple nitrate mitigation system of denitrification, absorption and evapotranspiration. V. LIMITATIONS The findings, calculations, opinions and conclusions of this report are based upon information from standard engineering and analytical test procedures, contemporary scientific literature and agency consultations. Information in this report is deemed reliable by the sources from where it was obtained. Our report is based upon current scientific knowledge to assess factors which are extremely variable and complex within the environment. San Joaquin County Environmental Health Department Standards have been employed for the purpose of preparing this study. Therefore, no guarantee or warranty is expressed or implied concerning any aspect of this investigation, or the prevention of environmental impact. We appreciate the opportunity to provide this service for you. If you should have any questions regarding to the information contained witlh g14iA report, please contact the undersigned. "�� F Respectfully submitted, tic .j; VALLEY Ag RESEARCH i 4 a \ Don Chesney, R.E.A. Registered Environmental Assessor#4675 9