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C'y <br /> E ' <br /> CONCLUSIONS <br /> 14 The percolation test results indicate sufficient capacity to manage anticipated wastewater flows. <br /> However, as the effluent travels downward and encounters the indigenous clay soils, <br /> permeability will be substantially impeded. The scientific literature cites a figure of 0.5 <br /> gals/ft'/day as a realistic acceptance rate after biomat equilibrium has been achieved. <br /> The calculations predict an impact below Drinking Water Standards/Maximum Contaminant <br /> Levels of 10 mg/L nitrate-nitrogen by using a wastewater treatment system. Given that <br /> significant nitrate impact has occurred in this area,treatment is warranted: In addition to the <br /> benefits of wastewater treatment, the clay soil should theoretically promote denitrification to a <br /> significant extent. Denitrification can be accomplished by installing the leachlines high in <br /> elevation (shallow) within the leachfield area. Landscape plants can be used within the <br /> i leachfield area to assimilate additional nitrogen, although caution should be exercised during the <br /> winter months to prevent the plants from drowning. <br /> LIMITATIONS <br /> The calculations, opinions and conclusions of this report are based upon information from <br /> standard engineering test procedures, contemporary scientific literature and agency consultations. <br /> Information in this report is deemed reliable by the sources from where it was obtained. Results <br /> of the percolation testing should be assumed to only represent the subsurface conditions <br /> encountered in the specific area of testing and not of the entire proposed leachfield area. <br /> Our report is based upon current scientific knowledge to assess factors which are extremely <br /> variable and complex within the environment. San Joaquin County Environmental Health <br /> Division Sewage Standards have been employed for the purpose of completing this report. <br /> Therefore, no guarantee or warranty concerning any aspect of the testing or mitigation of <br /> environmental impact, is expressed or implied. <br /> f We appreciate the opportunity to provide this service for you. If you should have any questions <br /> regarding to the information contained within this report, please contact the undersigned. <br /> £ry 1 RONSr�rA,,A <br /> Respectfully submitted, R� ?t� ,CHFS� <br /> f p <br /> VALLEY Ag ARCH No. 04675 x <br /> Expires:L A 't <br /> Don Chesne , R.E.A. OF C A L <br /> Registered Environmental ssessor 94675 <br /> -4- <br /> Vally Ag Research <br />