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~~~ ~• ~' fem. '~ o SEDIMENTATION POND EMBANKMENT TYPICAL SECTION NO SCALE Lorenclto Surface Mlne Pttue I Job No. 32,611 1.) SITE PREPARATION PRIOR TO PLACING FILL, THE AREA SHOULD BE STRIPPED OF ORGANIC TOPSOIL OR OTHER DELETERIOUS MATERIALS. 2.) ACCEPTABLE FILL MATERIALS SUITABLE FILL MATERIALS CAN BE OBTAINED FROM POND EXCAVATIONS OR FROM NEARBY BORROW SOURCES. SUITABLE MATERIALS INCLUDE NATIVE CLAY SOILS, CLAYEY SAND SOILS, AND BEDROCK MATERIALS WHICH ARE BROKEN DOWN TO THESE SOIL TYPES (S~C, GC, CL AND CH). BEDROCK MATERIALS SHOULD BE PROCESSED TO PRODUCE A SOIL LIKE MATERIAL WITH MAXIMUM PARTICLE SIZE OF 6 INCHES. THE MATERIALS USED AS EMBANKMENT FILL SHOULD HAVE AT LEAST 25 PERCENT FINES (MATERIAL FINER THAN N0. 200 SIEVE). 3.) UNACCEPTABLE FILL MATERIALS MATERIALS NOT CONSIDERED SUITABLE FOR USE AS EMBANKMENT FILL INCLUDE CLEANER SAND AND GRAVEL. ALSO UNACCEPTABLE ARE HIGHLY CARBONACEOUS MATERIALS OBTAINED FROM BEDROCK EXCAVATIONS OR WELL-CEMENTED SANDSTONES WHICH DO NOT BREAK DOWN TO SOIL LIKE MATERIAL. HIGHLY ORGANIC SOILS OR MATERIALS CONTAINING CONSTRUCTION DEBRIS ARE ALSO NOT ACCEPTABLE. FROZEN SOIL IS NOT ACCEPTABLE. 4.) FILL PLACEMENT AND COMPACTION THE EMBANKMENT FILLS SHOULD BE PLACED IN THIN HORIZONTAL LIFTS (ON THE ORDER OF 8 TO 12 INCHES LOOSE THICKNESS.) THE FILL SHOULD BE MOISTURE CONDITIONED TO WITHIN 2 PER~ENT OF OPTIMUM MOISTURE CONTENT AND COMPACTED TO AT LEAST 95 P RCENT OF STANDARD PROCTOR MAXIMUM DRY DENSITY (ASTM D 698). THE PLACING AND SPREADING OF FILL MATERIALS SHOULD BE STARTED AT THE LOWEST POINT OF THE EMBANKMENT. FILL PLACEMENT AND COMPACTION SHOULD BE OBSERVED AND TESTED BY QUALIFIED GEOTECHNICAL ENGINEERING FIRM. 5.) MONITORING AND INSPECTIONS MONITORING AND INSPECTIONS SHOULD BE PERFORMED BY QUALIFIED INDIVIDUALS AS OUTLINED IN CDMG REGULATIONS 4.05.6 (13). II ~X~}i~~T/3, ~/~'v~E 7~ ~~ Sedimentation B~NKn?QU I ,~-~% ~ Pond Details Flg. 7