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Eljen GSF Installation Instructions Manual

Geotextile sand filter
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Summary of Contents for Eljen GSF

  • Page 2: Table Of Contents

    2.3 Sloped Site Systems 2.4 Pumped Systems 2.5 System Venting 2.6 Commercial Systems 2.7 GSF Design Considerations for Replacing Failed Systems 2.8 Required Notes on Design Plans 3.0 System Installation Guidelines 3.1 General System Installation Guidelines 3.2 Trench and In-Ground Bed System Installation Instructions 3.3 Raised or Fill System Installation Instructions...

  • Page 3: Introduction

    BC SPM-V3. More commonly known as an “In-Ground Treatment System”, the Eljen GSF in BC is referred to as a “CTDS” or Combined Treatment and Dispersal System as detailed in the SPM-V3. The Eljen GSF is the only CTDS that meets the requirements of the SPM-V3 demands for both gravity and pressure distribution.

  • Page 4: Gsf System Description

    In British Columbia under the Sewerage System Regulation the Eljen GSF is a Type 2 Secondary Treatment System with the added benefit of reduced fecal coliform and nitrogen. In the Standard Practice Manual –...

  • Page 5: Glossary Of Terms

    (DDF) As defined in the SPM – V3, is the flow rate used for sizing a wastewater system taking into account mass loading and peak flows. The estimated peak flow per A-42 unit that is used to size a GSF system using residential strength waste is 72 liters per day per module.

  • Page 6: Table 1 Eljen Gsf Specified Sand

    Glossary of Terms Serial Distribution Also known as Sequential Distribution, are designs common to sloping sites where GSF lines that are laid on contour receive effluent from a series of “spill- overs” at different elevations. Effluent floods up-slope lines and then spills excess effluent to down-slope lines.

  • Page 7: Gsf System Sizing

    91 cm end-to-end to increased effective basal area without additional modules. All perforated holes not discharging at least 15 cm onto a GSF module must be sealed. See Figure 9 for a suggested method of sealing holes. For assistance with very large basal area requirements please contact the Eljen Technical Representative, BWD Engineering Inc.

  • Page 8: Design Guidelines

    Note in Version 3 of the SPM, an additional 15 cm of Vertical Separation has been added, in some soil categories, for Type 2 systems that reduce or remove the Type 1 bio-mat. In the case of the Eljen GSF, the bio-mat is retained allowing for the required Vertical Separation to remain the same as Type 1 designs.
  • Page 9 72 liters per day per module for trenches and beds and mound systems. Table 2 on page 7 indicates the minimum number of GSF A42 modules required for standard homes as listed in the SPM where trench, bed and mound systems are applicable. For all systems with unlisted Daily Design Flows (DDF) of residential effluent, the number of GSF A42 modules is calculated by dividing the DDF in Liters/day by 72 L/day/module.

  • Page 10: Level Site Systems

    A smaller pressure pipe is inside the larger perforated pipe. One small diameter pressurized hole is drilled for each GSF Module. The first and last holes in a single run are drilled at 5 o’clock and the remaining are drilled at 12 o’clock. Hole size is determined by dividing the selected pump flow rate by the number of holes, then looking up the diameter required for that flow per hole at the squirt height resulting from the residual head of the pump.

  • Page 11: System Venting

    2.5.1 VENTED SYSTEM: Air vents are only required on absorption systems when located under impervious surfaces or systems with more than 46 cm of cover material as measured from the top of the GSF module to finished grade. This will ensure proper aeration of the modules and sand filter. The GSF has aeration channels between the rows of GSF modules connecting to cuspations within the GSF modules.

  • Page 12: Figure 3 Air By-Pass Line Detail For Venting Of Pumped Systems

    SPECIFIED SAND AT END OF BED OR TRENCH OF BED OR TRENCH Figure 3: Air By-Pass Line Detail for Venting of Pumped Systems (when required) BY-PASS LINE VENT SEPTIC TANK GSF MODULES PUMP DISTRIBUTION CHAMBER 2016 British Columbia Design & Installation Manual www.eljen.com...

  • Page 13: Commercial Systems

    Designers must also consider how the distribution of the effluent onto the GSF modules may affect the linear loading rates and allow for the means to adjust the linear loading should the soils fail to move the effluent as predicted.
  • Page 14 The additional effluent can also increase the groundwater mound down slope. Recharge systems such as the GSF must be designed and located so that they can accept precipitation and the specified wastewater volume. Control and diversion of up-slope storm water is normally included in the design.

  • Page 15: Gsf Design Considerations For Replacing Failed Systems

    2.7 GSF Design Considerations for Replacing Failed Systems Before designing a GSF system to replace a failed system, IDENTIFY THE CAUSE OF FAILURE and adjust new system design accordingly. Listed below are some of the most common reasons why septic systems fail: ...

  • Page 16: Required Notes On Design Plans

    Backfill material can be native soil with no stones larger than 5 cm in any dimension to a maximum depth of 30 cm over the GSF modules and covered with 10 cm to 15 cm of clean loam. Any system that is more than 46 cm below finish grade as measured from the top of the module shall be vented.

  • Page 17: System Installation Guidelines

    4. In applications where modules are spaced out end-to-end to increase effective basal area all perforated holes not discharging at least 15 cm onto a GSF module must be sealed. See Figure 9 for an example. 5. Cover the tops and sides of the modules along the entire length of each row with Eljen geotextile cover fabric.

  • Page 18: Trench And In-Ground Bed System Installation Instructions

    8:00. 11. In applications where modules are spaced end-to-end to increase effective basal area all perforated holes not discharging at least 15 cm onto a GSF module must be sealed. See Figure 9 for an example. 12. Secure pipe to GSF modules using one Eljen hoop per module. Push hoop ends straight down into up-facing core, through the fabric and into the underlying sand.

  • Page 19: Raised Or Fill System Installation Instructions

    7. A hand tamper is sufficient to stabilize the Specified Sand below the GSF modules. Check the zero grade of the top of the Specified Sand using a 2 x 4 and carpenter’s level or a laser before placing the modules.

  • Page 20: Serial Distribution On Sloped System Installation Instructions

    10. Use approved 10 cm non-perforated pipe from the drop box to the GSF modules. 11. Install a line of approved 10 cm perforated distribution pipe lengthwise on the first row over the GSF modules with orifices at 4:00 and 8:00. Cap at the far end.

  • Page 21: Treated Effluent Sampling Port Installation

    The Sampling Collection Pipe should be centered underneath the GSF Module (See Section 14.1). Keep the sampling tube out of the way and out of the trench. 3. Place remaining 15 cm of Specified System Sand in the system area, filling the Collection Pipe with the Specified Sand.
  • Page 22 4. Pull the Sampling Tube through the Sampling Tube which is installed on top of the Specified Sand Layer. It should be located at the outside edge of the proposed location of the GSF unit area to be sampled. The Sampling Tube Storage Pipe should be tall enough to make it to the surface.

  • Page 23: Figure 6 Vertical Separation To Limiting Conditions

    Figure 7: A42 Trench Cross Section VEGETATIVE COVER TOPSOIL CLEAN BACKFILL 30 cm MIN. 18 cm 15 cm SPECIFIED SAND 61 cm 15 cm MIN. 46 cm MAX. 92 cm MIN. - 153 cm MAX. 2016 British Columbia Design & Installation Manual www.eljen.com...

  • Page 24: Figure 8 A42 Butterfly Trench Configuration

    PERFORATED PIPE STD 4" PIPE CUT IN HALF PERFORATED PIPE FITTED WITH 4" PIPE CUT IN HALF AND GLUED OVER PERFORATIONS STD ELJEN MODULE PERFORATED PIPE FITTED WITH 4" PIPE CUT IN HALF AND GLUED OVER UNUSED PERFORATIONS 91 CM NOTE: Half-pipe must cover any hole above the A42 module that is within 15 cm of the edge.

  • Page 25: Figure 10 A42 Bed Cross Section

    Figure 11: Level Bed Plan View Note: Middle cross-over pipes (not shown) are recommended for systems over 15m (50ft) Long. Contact Eljen for Cross-Over pipe details if needed. Cross-Over & end loop pipes are not required on Pressure or Serial Bed Systems.

  • Page 26: Figure 12 A42 Raised Bed (Sand Mound) Cross Section

    OF 15 cm OF LOAM AND SEED 15 cm MIN. 30 cm MIN. 46 cm MAX. 91 cm MAX. SPECIFIED SAND 15 cm REMOVE 60 cm ORGANIC LAYER FILL MATERIAL PER MIN. BC REGULATION ORGINAL GRADE 2016 British Columbia Design & Installation Manual www.eljen.com...

  • Page 27: Figure 15 Pressure Distribution Lateral Layout

    (LPP) CAP END OF 4" PIPE STANDARD FITTINGS GLUED 4" DIAMETER AND CONNECTED INSIDE PERFORATED PIPE PRESSURE PIPE CROSS SECTION FOR ALL APPLICATIONS 4" DIAMETER PERFORATED PIPE 1.25" DIAMETER LOW PRESSURE PIPE 2016 British Columbia Design & Installation Manual www.eljen.com...
  • Page 28 In the mid-1980s, we introduced our Geotextile Sand Filter products for the passive advanced treatment of onsite wastewater in both residential and commercial applications. Today, Eljen is a global leader in providing innovative products and solutions for protecting our environment and public health.

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