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60 MIL HDPE LINER GLC COMPOSITE LINER-. - 6' FENCE (NEW OR RELOCATED) UP -SLOPE ANCHOR TRENCH (5SIMILAR NEW 60 -MIL HDPE LINER EXISTING GROUND OVER GCL COMPOSITE LINER SURFACE 3 r FOR TYPICAL LINER 5 SECTION SEE DETAIL ANCHOR TRENCH BACK FILL -� ��1 VARIES SEE PLANS 6" ROAD WEARING COURSE 3% SLOPE .N 3 RANDOM FILL (SEE NOTE 1) EXCAVATION % LEAVE EXISTING MATERIAL -J NATIVE SOIL AS TAILINGS CONTAINMENT BERM (APPROX. 6' HIGH) SAFETY BERM 1 2 NOTES: 1. RANDOM FILL CONSISTS OF BORROW MATERIAL GENERATED FROM POND EXCAVATION. LARGE ROCK FRAGMENTS AND BOULDERS THAT ARE GREATER THAN 6" IN DIAMETER SHALL BE GRADED TO THE DOWNSTREAM FACE. FINER GRAIN MATERIAL SHALL BE PLACED IN THE UPSTREAM ZONE OF THE EMBANKMENT. 2. ALL FILL PLACED SHALL BE IN ACCORDANCE WITH THE TECHNICAL SPECIFICATIONS. NEW POND LINER --\ TAILINGS POND CREST GEOMEMBRANE /GCL ANCHOR TRENCH 2 SCALE C 4 4 0 4 FEET 2' TYP. 1' COMPACTED BACKFILL INTERIM ANCHOR TRENCH NOT TO SCALE IH 0 in EXISTING HDPE POND LINER INTERIM CONTAINMENT BERM REVISIONS EXISTING HDPE LINER INTERIM ANCHOR -OQ TRENCH. SEE 1.s\ DETAIL � 11 ""' 1.5 ESTIMATED BEDROCK SURFACE- TAILINGS POND EXPANSION CONSTRUCTION DETAIL 1 SCALE C4 10 0 10 FEET (HORIZ. & VERT.) EXISTING GROUND SURFACE 1.5 1.5 NEW 60 -MIL HDPE LINER OVER GCL COMPOSITE LINER- BIAXIAL GEOGRID 1 5 1.5 CREST ANCHOR e TRENCH EXISTING TAILINGS TO BE RELOCATED NOTES: 1. CAST EXCAVATED SPOIL TO DOWNSLOPE SIDE OF DITCH. 2. SLOPE OF DITCH TO BE MAINTAINED AT NO GREATER THAN 2 %. 3. HAY BALES SHALL BE PLACED AT THE DITCH OUTLET FOR SEDIMENT CONTROL. V —NOTCH DRAINAGE DITCH 3 SCALE C4 2 0 2 FEET 60 MIL HDPE LINER GCL !L SAND LEVELING LAYER j\ -(AS NECESSARY) BEDROCK TYPICAL LINER SECTION NOT TO SCALE BY I DATE I NO. I REVISIONS 0 1 ISSUE FOR REVIEW — NOT FOR CONSTRUCTION 5 C4 LCO l EMBANKMENT RAISE CREST EL. 8420 EXISTING TAILINGS TO REMAIN IN PLACE EXISTING EMBANKMENT CREST EL. 8409 EXISTING FENCE (REMOVE & REPLACE) EXISTING POWER POLES (DO NOT DISTURB) -\ TERRACE EXISTING EMBANKMENT AS NECESSARY EXISTING GROUND CONSTRUCTION SEQUENCE 01 REMOVE THE EXPOSED LINER LOCATED ON THE NORTH BANK OF THE EXISTING POND AND THE __FZ ►GE-- S4RR.OI'&'f"l0.S - 20 PLACE A BIAXIAL GEOGRID OVER THE EXISTING TAILINGS WHICH ARE TO BE COVERED BY THE EMBANKMENT EXTENSION /RAISE. TERRACE THE DOWNSTREAM SLOPE OF THE EXISTING EMBANKMENT AS NECESSARY TO PROVIDE SUITABLE SURFACE FOR PLACEMENT AND COMPACTION OF MATERIAL. 03 EXCAVATE THE MATERIAL NORTH OF THE EXISTING POND TO THE CONTOUR SHOWN ON DRAWING 5461 -C2. LEAVE AN INTERIM CONTAINMENT BERM BETWEEN THE NEW EXCAVATION AND THE EXISTING TAILINGS POND. SECURE EDGE OF EXISTING LINER IN INTERIM ANCHOR TRENCH. ® PLACE AND COMPACT THE EXCAVATED MATERIAL TO FORM THE EMBANKMENT EXTENSION. TERRACE THE DOWNSTREAM SLOPE OF THE EXISTING EMBANKMENT AS NECESSARY TO PROPERLY PLACE AND COMPACT THE NEW EMBANKMENT MATERIAL. 05 INSTALL THE NEW 60 -MIL HDPE LINER AND GCL IN THE NEWLY EXCAVATED PORTION OF THE POND FROM THE UP -SLOPE ANCHOR TRENCH TO THE CONTAINMENT BERM. TEMPORARILY ANCHOR THE LINER AND GCL AT THE CONTAINMENT BERM USING SAND BAGS. © RELOCATE THE EXISTING TAILINGS WHICH ARE NOT LOCATED UNDERNEATH THE EMBANKMENT EXTENSION INTO THE NEWLY LINED PORTION OF THE POND. 07 CONTINUE INSTALLING THE NEW LINER AND GCL FROM THE CONTAINMENT BERM, ACROSS THE EXISTING POND, AND UP THE NEW EMBANKMENT EXTENSION TO THE CREST ANCHOR TRENCH. ® PLACE FENCE AROUND POND PERIMETER AND EMBANKMENT CREST. RECEIVED JUL 13 1998 Division of Minerals 8 Geology AcCulley, Frick & Gilman, Inc providing environmental consulting and engineering services ESIGNED BY: DJH RAWN BY: PRM HECKED BY: LCO PPROVED BY: — ILE NAME: 5461- 11.DWG I08gAlNllgd 8111111 0017754 ITEC ENVIRONMENTAL COLORADO INC. CASH MINE SITE DEVELOPMENT POND DETAILS TE JUNE, 1998 IDRAWING N0. 5461 —05 IREVISION 0