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2.0 Design and Installation <br /> 2.3 VERTICAL SEPARATION TO LIMITING LAYER: The Vertical Separation is measured from the <br /> bottom of the 6 inches of sand under the GSF units to the limiting layer shall not be less than 2 feet. <br /> FIGURE 3: VERTICAL SEPARATION DISTANCE <br /> SEED AND LOAM <br /> GEOTEXTI LE <br /> FABRIC <br /> 7° <br /> 6" <br /> SPECIFIED SAND <br /> 24" MIN TO GROUNDWATER-24" MIN TO BEDROCK <br /> 2.4 SPECIFIED SAND SPECIFICATION FOR GSF SYSTEMS: The sand immediately under, between <br /> rows and around the perimeter of the GSF system must meet ASTM C33 SPECIFICATIONS, WITH LESS <br /> THAN 10% PASSING A #100 SIEVE AND LESS THAN 5% PASSING A #200 SIEVE. Please place a <br /> prominent note to this effect on each design drawing. See Table 1 for more information on the sand and <br /> sieve specifications. Washed concrete sand easily meets the above specification and is a reliable choice. <br /> Suitability of bank run sand must be verified. <br /> 2.5 PLACING GSF MODULES: The "painted stripe"on the GSF modules indicates the top of the module <br /> and is not intended to indicate the location of the distribution pipe. With the painted stripe facing up, all <br /> rows of GSF modules are set level, end to end on the Specified Sand layer. Beds on level sites require a <br /> minimum spacing of 12" of Specified Sand between parallel module rows with 24" of separation required <br /> on sites with 15%to 20% slope. No mechanical connection is required between modules. <br /> 2.6 DISTRIBUTION: Gravity, pump to gravity or pressure distribution are acceptable when using the GSF <br /> System. Piping shall meet the requirements guidelines; however, Eljen strongly recommends the use of <br /> SDR 35 pipe and fittings as to prevent crushing during backfill. <br /> All systems require a perforated 4" diameter pipe centered on top of the GSF modules unless the system <br /> is curving. The distribution pipe continues along the entire length of all modules in a trench or row. Holes <br /> are set at the 4 and 8 o'clock position and secured by the Eljen provided wire clamps. <br /> When using pressure distribution, a pressure manifold is placed inside the 4-inch distribution pipe or orifice <br /> shields are placed over the pressure manifold. Section 7.0 of this manual goes into details of how to <br /> construct the distribution network. All piping must meet state and local regulations. <br /> 2.7 CONNECTIONS AND FITTINGS: Connections of lines to tanks and distribution boxes must be made <br /> using watertight mechanical seals. Use of any grouting material is not permitted. <br /> 2022 California Design&Installation Manual Page 7 www.eljen.com <br />