Two soil and drainage backfill options behind a concrete retaining wall stem and footing. Option A utilizes crushed rock wrapped in Mirafi 140N or equivalent filter fabric, topped with compacted impervious soil. Option B incorporates Miradrain or an approved equal drainage mat combined with Class II permeable material. Both options house a four-inch diameter perforated pipe conforming to ASTM test method 2729 at the base, laid with holes down and sloped to drain per the soils report.
1' - 0" 0" @ INT. 18" @ EXT. CRUSHED ROCK - SEE SOILS REPORT MIRAFI 140N OR EQUIVALENT FILTER FABRIC - SEE SOILS REPORT COMPACTED IMPERVIOUS SOIL - SEE SOILS REPORT 4-INCH DIAMETER PERFORATED PIPE CONFORMING TO ASTM TEST METHOD 2729 - SEE SOILS REPORT NOTE: PERFORATED PIPE SHALL BE LAID WITH HOLES DOWN AND SLOPED TO DRAIN 1' - 0" 0" @ INT. 18" @ EXT. CLASS II PERMEABLE MATERIAL - SEE SOILS REPORT MIRADRAIN OR APPROVED EQUAL - SEE SOILS REPORT 4-INCH DIAMETER PERFORATED PIPE CONFORMING TO ASTM TEST METHOD 2729 - SEE SOILS REPORT OPTION A SEE SOILS REPORT OPTION B SEE SOILS REPORT
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