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Wall waterproofing per Architect's specifications <br />Compacted, cohesive soil backfill, <br />compacted to min. 90% relative <br />compaction per approved by the <br />Geotechnical Consultant* <br />Filter fabric envelope (Mirafi <br />Retaining wall per structural plan 140N or approved equivalent) <br />** <br />"Very Low" expansive soil (EI < 20) backfill, <br />compacted to min. 90% relative compaction Native Soils (slope <br />per approved by the Geotechnical Consultant*gradient for back cut <br />to follow that of <br />4" (min.) diameter perforated PVC pipe temporary excavation <br />(Schedule 40, SDR 35 or equivalent) with stipulated in the Soils <br />perforations oriented down as depicted. Report) <br />Min. 1% gradient to suitable outlet. <br />Finish grade <br />3/4" ~ 1-1/2" clean gravel** <br />Retaining Wall Footing <br />3" min. <br />Competent bedrock, native soils or certified compacted fill <br />per approved by the Geotechnical Consultant <br /> * Based on ASTM D-1557-12 <br /> ** If Caltrans Class II permeable material (see gradation to <br /> left) is used in place of 3/4" ~ 1-1/2" gravel, filter fabric <br /> may be deleted. Caltrans Class 2 permeable material <br />1"100 should be compacted to minimum 90 percent relative <br />3/4"90 ~ 100 compaction. Unless otherwise specified, a minimum of <br />3/8"40 ~ 100 1 cubic foot of gravel should be used for each 1 foot run <br />No. 4 25 ~ 40 of drain. <br />No. 8 18 ~ 33 Note 1: Composite drainage products such as Contech C-Drain, <br />No. 30 5 ~ 15 Miradrain or J-Drain may be used as alternative to <br />No. 50 0 ~ 7 gravel or Class II. Installation should be performed <br />No. 200 0 ~ 3 in accordance with manufacturer's specifications. <br />Project: <br />Proj. No.:7160.23 Date:January, 2024 <br />2860 Walnut Avenue <br />Figure 5 Nearby Building Surcharge Consideration & <br />Retaining Wall Drainage DetailsSignal Hill, CA 90755 <br />Tel (562) 426-7990 Fax (562) 426-1842 <br />Proposed Community Hub Building <br />1801 E. Chestnut Av., Santa Ana,CA <br />SPECIFICATIONS FOR CALTRANS CLASS II PERMEABLE MATERIAL <br />U.S. STANDARD SIEVE SIZE % PASSING <br />Sand Equivalent > 75 <br />Associated Soils Engineering, Inc. <br />6" min. <br />overlap <br />1' min. <br />Compacted Fill <br />1' <br /> <br />m <br />i <br />n <br />. <br />18" min. <br />Width of very low expansive <br />backfill zone per the Soils <br />Report & Note 2. <br />1 <br />1 <br />Limit of area where 1/3 and 1/2 of the loading from nearby <br />buildings/structural features should be accounted for in <br />cantilevered and top-restrained retaining wall design, <br />respectively. <br />Schematic Not To Scale <br />Note 2: Width of " Very Low" expansion backfill equals 1/2 of <br />retained height, or distance from back of wall to heel <br />of footing, whichever is greater.