Two backfill and drainage options function behind a concrete retaining wall stem and footing. Option A incorporates a 4-inch diameter perforated pipe conforming to ASTM Test Method 2729 embedded in crushed rock wrapped with Mirafi 140N or equivalent filter fabric, topped with compacted impervious soil. Option B utilizes a 4-inch diameter perforated pipe in Class II permeable material wrapped with Miradrain or approved equal drainage matting. The perforated pipe must be laid with holes down and sloped to drain per the soils report. Dimensions indicate a 1-foot width for the drainage zone, with vertical extents governed by interior and exterior grades.
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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