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it <br /> � t <br /> ` REEVE TRUCKING <br /> Page No. b <br /> " <br /> Denitrification is the biological or chemical reduction of nitrate to volatile gases. <br /> Denitrification often converts between 10%to 25% of nitrates in the effluent to gases." Sites <br /> with higher clay content and slow peculation rates often denitrify 25% or more of the <br /> effluent/rain but sites with higher sand content and fast peculation rates denitrify about 10% or <br /> less of the effluent/rain. We selected the generally accepted 25%value for use on the site due to <br /> a slow peculation rate and due to the higher clay content of the soil. <br /> r'~ <br /> VII CONCLUSION <br /> Based on the results of the study, it is our opinion that the subject property is suitable for <br /> use of an on-site sewage disposal system. The system should utilized leach lines and dry wells. <br /> If the proposed septic system is not in the general area of the percolation test, an additional test <br /> may need to be performed. Any proposed system should be properly designed and installed <br /> according to current San Joaquin County criteria. <br /> The results of the Nitrate Loading analysis indicates an average nitrate-N concentration <br /> of combined effluent and rainfall percolate concentration is estimated to be 4.7 mg/l. This <br /> concentration is below the drinking water standard 10 mg/1 nitrate-N for groundwater. The <br /> depth to ground water is about 75 feet and measured water quality has shown no detection of <br /> nitrate-N in ground water. Based n the analysis we believeZhere-willbepa significant negafi�e <br /> f { : act to round.ovate—r <br /> Vill LIMITATIONS <br /> The conclusions of this report are based on the information provided regarding the <br /> existing and proposed development, the use of the subject property, and the site conditions as <br /> they existed at the time we excavated our test hole and performed the percolation test. It was <br /> r assumed that the test hole and percolation test results are representative of the subsurface <br /> conditions in the general area. <br /> G L: 4 Hantzshe N.N.,Finnemore,E.J. 1991, Predicating Ground-Water Nitrate-Nitrogen Impacts, Ground <br /> Water Vol.30,No. 4. <br /> i <br /> �ortItso <br /> S N <br /> z W <br /> P <br /> 4SS0G� <br /> r � <br />