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------------------------- F APPEN©IX C: XERXES SPLIT BACKFILL INSTRUCTIONS I C1.GENERAL 02.5.Secondary backfill must be compacted to achieve a mini_ � 01.1.Use select rounded or crushed stones for primary backfill mum of 85 percent standard proctor density. kti: material as specified in the Xerxes Installation Manual in effect at 02,5.1.Do not use rammer-type compactors over the top of the F? time of installation,and the Xerxes APPENDIX B(and supplement), tank. Primary Backfill Requirements. i 02.5.2.Some tank owners may require sample testing and written 02.SPLIT BACKFILL INSTALLATION reports to verify the compaction of the backfill. C2.1.Use the primary backfill material vertically up to at least 75 C2.6. Material must be installed in 12-inch to 24-inch lifts compat- percent of the tank diameter.See FIGURE C]-1. ible with the compaction equipment used. C2.2.Follow the instructions in SECTION 6 of the Installation C2.7. In some conditions,frost heave may be encountered when F: Manual on the placement of this backfill motorial. using secondary backfill.Therefore,consider any problems that 02,3.Instal[a layer of geotexti[e filter fabric over the entire surface may occur. t= of the primary backfill material.See SECTION 9 for more informa- C2.8.Specifications for secondary backfill material and com- tion about geotextile filter fabric. paction above the fiiter fabric may be determined by the require- C2.3.1.All joints in the filter fabric should be overlapped a mini- ments of the piping,surface slab or roadway. mum of 12 inches. 02,9. Refer to applicable codes or standards for base course and C2.3.2.Geotextile fabric must overlap onto the tank and excava- sub-base course material and compaction requirements. tion surface a minimum of 12 inches. 02.10.The following are examples of acceptable secondary back- C2.3.3.Installations with unstable soil may require that the fabric fill material: line the entire excavation.See SECTION 9 for specific information 02.10.1.clean native backfill about using geotextile filter fabric in unstable-soil conditions. C2.10-2.coarse sand or grave[ �= C2.4.Clean native backfill may be used as secondary backfill ma- G2.11.One hundred percent(100°/0)of all backfill material must tori al above the geotextile fabric to subgrade. pass through a 1-inch sieve, 02.4.1.Secondary backfill material must be clean,free-flowing, and free of large rocks,roots,organic materials,debris,ice and snow.Backfill material shall not be frozen or contain lumps of frozen material at any time during installation. FIGURE C1-1 —Split Backfill Installation l e: Grade or subgrade Secondary backfill material III 114! IIII Filter fabric with a IIII Illi ` minimum of 12" overlaps IIII 111 IIII ' - II IIII � � IIII IIII J I-III 75% of tank diameter Primary backfillMI III^III I 1' id material IIII - x . ;'.'' 12" bedding rr IIII.= IIII:-1111 �1111 `IIII� IIlI=1111`III E t- I� 29