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ERS, Inc. April 7 , 1986 Page 2 07s <br /> suitable soil properties for low pressure pipe systems. All of <br /> the lots evaluated will require that the nitrification lines be <br /> placed at a depth of less than 36 inches due to the moderate soil <br /> depth to rock or saprolite. Placement of the nitrification field <br /> piping at a depth of approximately 18 inches from the soil <br /> surface will take advantage of the loamy textures generally <br /> encountered at this depth at the site. Since most of the <br /> nitrification fields are located up slope from the proposed <br /> dwellings, these systems will require a pump and pump tank in <br /> addition to the septic tank and nitrification field piping. Due <br /> to the shallow placement and the pump requirements, low pressure <br /> pipe systems are the type of on-site system Law Engineering <br /> recommends for the project. <br /> In addition, we recommend the use of water conservation toilets <br /> at each proposed home-site. These toilets substantially reduce <br /> the amount of water to be treated by the system. The toilets <br /> generally work using a small air compressor and usually flush <br /> approximately one gallon of water per flush cycle. Conventional <br /> toilets flush about five gallons of water per cycle. <br /> We appreciate the opportunity to provide these services for your <br /> project. If you have questions or if we can be of further <br /> assistance, please contact us. <br /> Very truly yours, <br /> LAW ENGINEERING TESTING COMPANY <br /> Fred D. Smith <br /> Soil Scientist <br /> / 4, <br /> �. lan Tice, P. S. <br /> Senior Geotechnical Engineer <br /> Registered, North Carolina 6428 <br /> FDS/JAT/sar <br /> LAW TESTING COMPANY <br />