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8.0 System Ventilation <br /> 8.1 SYSTEM VENTILATION: Air vents are required on all absorption systems located under impervious <br /> surfaces or systems with more than 18 inches of cover material as measured from the top of the GSF <br /> module to finished grade. This will ensure proper aeration of the modules and sand filter. The GSF has <br /> aeration channels between the rows of GSF modules connecting to cuspations within the GSF modules. <br /> Under normal operating conditions, only a fraction of the filter is in use. The unused channels remain open <br /> for intermittent peak flows and the transfer of air. <br /> 8.2 VENT PIPE FOR GRAVITY AND LOW-PRESSURE SYSTEMS: Systems with over 18" of cover over <br /> the top of the modules require a vent. If the system is a low-pressure distribution system, ensure that the <br /> LPP clean outs are located in the vent for easy access. <br /> FIGURE 16: VENT LAYOUTS FOR GRAVITY AND LOW-PRESSURE SYSTEMS <br /> TREADED CAP <br /> EDGE OF LAST MODULE IN EDGE OF LAST MODULE IN <br /> ABSORPTION AREA ABSORPTION AREA <br /> SPECIFIED SAND SPECIFIED SAND <br /> AT END OF ROW AT END OF ROW <br /> 8.0.3 AIR BY-PASS LINE: Systems with over 18" of cover that are pumped or pressure dosed require an <br /> air by-pass line to continue flow from the low vent on the system to the high vent of the house. Simply <br /> plumb an airline from the distribution system back to the pump chamber or septic tank to provide <br /> unobstructed flow. <br /> FIGURE 17: AIR BY-PASS LINE PLAN VIEW FOR VENTING OF PUMPED SYSTEMS <br /> BY-PASS LINE GSF SYSTEM <br /> VENT <br /> SEPTIC TANK <br /> PUMP <br /> CHAMBER DISTRIBUTION <br /> BOX <br /> 2022 California Design&Installation Manual Page 22 www.eljen.com <br />