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� � ' <br /> I <br /> I <br /> 5. Description of the Treatment Process — <br /> I • Primary Treatment - Sewa e will be ravi dischar ed from the house a I 650 II n <br /> g S tY S ga o dual <br /> compartment septic tank. Natural biologica; activities taking place inside of the septic tank will <br /> separate solids and suspended particles. Solids are reduced to some extent through this <br /> process. <br /> • Secondary Treatment— Septage from the clear zone of the septic tank out of the septic tank <br /> into a lift tank where an Orenco brand biotube screened pump vault will be placed. The <br /> screened pump vault will consist of a modified well pump and an array of one polypropylene <br /> tubes with I/8" holes to filter out suspended particles larger than I/8". Filtering out the <br /> suspended particles reduces the biological loading rate on the drainfield. <br /> • Final Treatment—Screened septage will be pumped to the first of two trenches 44' long each. <br /> Drop boxes will be used to connect the trenches together in a series. The pump will discharge <br /> into the drop box of the highest zrencn, from this point gravity distribution will take place. <br /> The drainfield media will consist of Infiltrator brand chambers, High Capacity H-I 0, or <br /> equivalent. This model is chamber is equal to 12" of sewer rock below a perforated sewer <br /> pipe. As the septage trickles down through the side-walls of the chambers and into the soil <br /> biochemical processes remove harmful viruses and bacteria. <br /> 5. �2SCf"1(�t;Ofl CFTf���.�ici�i..c.i�j�i.cii� - <br /> • Septic Tank— Use a I 5a0 fiberglass septic tank. �lastic tar�� will not work and are specifically <br /> eliminated from this design. Inlet and outlet of the tanlcs must have cast in place rubber fittings <br /> to create a watertight seal around the inlet and outlet pipes. Extend 4" sch. 40 pvc pipe to lift <br /> tan k. <br /> • Septic Tank Risers — Use 24" diameter heavy corrugated pvc pipe. A watertight seal must be <br /> created between top of tank and the each riser. Top of risers should be at an elevation ��2m�" <br /> above finished grade. <br /> • Septic Tank Riser Covers — Use 24" diameter fiberglass covers with gasket, Orenco modei # <br /> FL24G14 (or equivalent). Do not bury riser covers. <br /> 2 <br />