2018 Indiana Design and Installation Manual 4 www.eljen.com
Glossary of Terms
A42 Module 48” x 24” x 7” (L x W x H)
B43 Module 48” x 36” x 7” (L x W x H)
Cover Fabric The geotextile cover fabric (provided by manufacturer) that is placed over
the GSF modules. Barrier material cannot be substituted.
Design Flow The estimated peak flow that is used to size a GSF system is 150 gallons
per day per bedroom.
GSF Unit The Eljen Geotextile Sand Filter Modules and the minimum 6-inch (for
subsurface trench or bed) or minimum 12-inch (for above grade or
elevated sand mound) sand layer at the base and 6 inches along the sides
of the modules.
GSF Module The individual module of a GSF system. The module is comprised of a
cuspated plastic core and geotextile fabric.
Specified Sand To ensure proper system operation, the system MUST be installed using
Indiana Department of Transportation Specification 23 (INDOT SPEC 23)
sand AND must be used in accordance with ISDH Rule 410 IAC 6-8.3 (80)
(j) or ISDH Rule 410 6-10.1 (88) (j). Ask your material supplier for a sieve
analysis to verify that your material meets the required specifications.
Please place a prominent note to this effect on each design drawing.
TABLE 1: SPECIFIED SAND SIEVE REQUIREMENTS
INDIANA DEPARTMENT OF TRANSPORTATION
SPECIFICATION 23 SAND
Sieve Size
Sieve Square
Opening Size
Specification
Percent Passing
(Wet Sieve)
3/8 inch 9.52 mm 100
No. 4 4.76 mm 95 - 100
No. 8 2.38 mm 80 - 100
No. 16 1.19 mm 50 - 85
No. 30 590 µm 25 - 60
No. 50 297 µm 5 - 30
No. 100 149 µm 0 - 10
No. 200 75 µm 0 - 3
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