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SDCO —\ OVERFLOW DRAIN <br />TOP OF <br />OVERFLOW DRAIN <br />SILVA CELL <br />NOTES <br />BOTTOM OF SILVA CELLS--/ <br />SILVA CELL UNIT <br />3.0' TYP <br />CITY STANDARD D8 <br />STORM DRAIN INLET <br />FILL LINE—i\ <br />SILVA CELL <br />POST <br />12 DEPTH D7111 <br />CALTRANPERMEABLE — <br />NATIVE SOIL @ 95% R.C. <br />(2) 2" DIA. HOLES IN BASS <br />TO ALLOW FOR EXFILTRATIOIV <br />SILVA CELL SUBDRAIN IN GR�AL <br />BASE FILL W/ CLEANOUT <br />SILVA CELL PERMEABLE GEO TEXTILE <br />N.T.S. 1.0' STORAGE LAYER <br />11 <br />SILVA CELL SYSTEM (DECK, BASE, AND <br />�^J <br />POSTS). <br />18" TREATMENT SOIL, INFILTRATION RATE <br />5 TO 10 IN/HR (FOR TREATMENT SOIL <br />SPECIFICATION, SEE APPENDIX K IN <br />SMCWPPP C3 STORMWATER HANDBOOK <br />DATED JUNE 2016). <br />12" DRAIN ROCK (CLASS II PERMEABLE <br />MATERIAL PER CALTRANS STANDARD <br />SPECIFICATIONS, SECTION 68-2.02F). <br />GEOTEXTILE (MIRAFI 140N OR APPROVED <br />G� <br />EQUAL) TO KEEP AGGREGATE FROM <br />MIGRATING DOWN THROUGH CELL DECK. <br />CLASS II AGGREGATE BASE COURSE, <br />H <br />DEPTH VARIES ACROSS SECTION. <br />/1 <br />PEDESTRIAN SIDEWALK, SEE LANDSCAPE <br />PLANS FOR LAYOUT & DETAILS. <br />J� <br />6" PERFORATED DISTRIBUTION PIPE. <br />K <br />CALTRANS CLASS 2 DRAIN ROCK. <br />L <br />8" PERFORATED COLLECTOR PIPE. <br />DISTRIBUTION HEADER <br />W/ INLET PIPE <br />CONCRETE SIDEWALK <br />OVER AGG BASE, SC <br />COVER <br />STORM DRAIN CLEANOUT. CHRISTY TYPE <br />L"J FOB BOX WITH F08R LID MARKED STORM <br />GEOGRID, ATTACH TO CELL FRAMES WITH <br />CABLE TIES. <br />11 CABLE TIES, ATTACHING GEOGIRD TO <br />SILVA CELL LEG. <br />,,rrte� <br />1"-4" (25 MM -100 MM) SPACING <br />U BETWEEN SILVA CELLS AT BASE. <br />4" (100 MM) MIN AGGREGATE SUB CASE, <br />R COMPACTED TO 957. RELATIVE <br />COMPACTION. <br />GEOTEXTILE (MIRAFI 140N OR APPROVED <br />Q EQUAL), TO PROVIDE SEPARATION <br />BETWEEN SUBGRADE AND AGGREGATE <br />BASE. <br />SUBGRADE, COMPACTED TO 95% RELATIVE <br />COMPACTION. <br />PIN, PER SILVA CELL SPECIFICATIONS, TO <br />U KEEP CELLS IN PLACE DURING <br />CONSTRUCTION. <br />OVERFLOW DRAIN. NDS IN-LINE GRATE <br />PLACED 6" MIN ABOVE BIO -MEDIA SOIL <br />MIX.. <br />EXHIBIT B4 <br />we TA L U S STORM WATER MAINTENANCE AGREEMENT <br />Z W �-- �- SILVA CELL TREATMENT: C-1 <br />a ENGINEERINOIPLANNING IDEVELOPMENT <br />0o Job No.: 18190 Date: 01/19/22 Sheet: 04 of 05 <br />ATTY/AGR.2022.074/STMMA (Page 14 of 22) <br />