SR0084912_LIQUID WASTE PLAN CHECK

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2.0 Design and Installation 2.11 COVER FABRIC: Geotextile cover fabric is provided by Eljen Corporation for all GSF systems. It is placed over the top and sides of the module rows to prevent long term siltation and failure. Cover fabric substitution is not allowed. Fabric should drape vertically over the pipe and must not block holes in the distribution pipe or be stretched from the top of the pipe to the outside edge of the modules. "Tenting"will cause undue stress on fabric and pipe. 2.12 SYSTEM VENTING: It is required to vent all systems that are over 18" below finished grade and systems beneath any surface condition that would not allow for surface air exchange with the system such as patios. Systems that exceed 50 feet in length require venting as well according to Title 5. See Section 8.0 for a more detailed explanation of venting GSF products. 2.13 BACKFILL & FINISH GRADING: Complete backfill with a minimum of 6 inches of clean porous fill measured from the top of distribution pipe. Backfill exceeding 18 inches requires venting at the far end of the system. Use well graded native soil fill that is clean, porous and devoid of large rocks. Do not use wheeled equipment over the system. A light track machine may be used with caution, avoiding crushing or shifting of pipe assembly. Divert surface runoff from the field. Finish grade to prevent surface ponding. Topsoil and seed system area to protect from erosion. 2.14 SYSTEM GEOMETRY: Design systems as long and narrow as practical along site contours to minimize ground water mounding especially in poorly drained low permeability soils. If possible, design level systems with equal number of modules per row. 2.15 NUMBER OF GSF MODULES REQUIRED: At a minimum, every system shall be sized 6 A42 modules per bedroom. Units are scaled up for slower soils to improve distribution in the absorption area. 2022 California Design&Installation Manual Page 9 www.eljen.com