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~1 <br /> <br />~~ <br />CiQld Hill hill Adeauacv Review Reevonae Mar Z. 19~ <br />27. a) The only available as-built topoptaphic information end sections was sent to the prvinon on Apri12~ <br />1995 by Mark Sxrn of Mi Vida Enteryrtses. We have no documrnmdon on foundation characteristics <br />or foundebon susLce preparation. <br />b) Dimensions of the existing starter dam u shown in plan end cTOSa xchone from Mark Steen are' <br />Crest Elevation NA <br />Crest Width: l0 to l2 feet nominal <br />Crest Length: Approx. 370 feet <br />iJpatteem Slope Angle I.6:1 to groats titan 3:1 <br />Dowrtstreem Slope Angle Approx. I.S~ 1 <br />c) No information is ctaratdy avadeble on embankmrnt metcrisls. COM, Inc will attempt to mks <br />samples Cor analysis as soon es weather conditions allow work on-site to restune. A report dated <br />November I t, 1985 6om Denver Enguteering Corporation indicated that the teilitrgs pond was <br />constructed to meet plans and specitlwtioru. <br />d) A cortsWction discripti0n letter risen Mt. Mark Steen, dated July 16, t 967 to the Division, lists the lines <br />u a 30 ml polyethylene line[. A copy of the letter u attached All laws in the Ilner will be patched by <br />e qualified company by the rnd of June. <br />e) The decant line is a 2-rush HDPE line vnth Duet risers (open pipe tees) placed at equal dutancea along <br />the line. The line u about 230 feet long and u placed on top of the tadings in the water ponding ties. <br />The pipe is connected to a 2-inch PVC standpipe that is located at the south end of the pond. The <br />standpipe goes horizontally through the liner and embankment et the bottom of the pond. W e have no <br />details on the standpipe u it goes through die liner or the embankrtrent. The Linch PVC ppc u buried <br />[o a point just below the base nC the embankment where a vdve box is located. The 2-inch PVC <br />pipeline then is laid on the surface oC the ground down to the Hanel A edit (sa Exhibit A) where the <br />pipeline goo through a short unlined borehole and into the horizontal Hazel A edit. The pipeline <br />extends back @om the portal approximately 30 fat whore the pipeline discharges behind a wooden <br />Irulldtead that contauta the vaster cr the mine workings that ere wnnttted to the Tune and Wynona <br />mines. Water from Led Hand Croak is also pumped 3,900 feet through the 2-inch pipeline located ht <br />Alans Cinch and situated on property purchased by C.O.M Inc. to a pours north of County Road No. <br />S2 whcrc We vrete line enter iha poral o f the Time mule. A btlkhead is conatttuted in the Tune mine <br />edit and water is discharged from the pipe into the Time mine workings behind the bulkhead. The Time <br />mine edit passes a3-feet below County Road No. 52 and extends 393 feet ur a southeasterly direction <br />when the Tlme mine is connected with the Wynona mine by a SO-foot deep winze. Both the Timt sod <br />Wynone mina are bauig mad to store water Cor tndlirtg operetioru for the period between Novrnrba I <br />and May 3I. Mill ware is drawn @om the workittge by pumping the water out of the Wynone mine <br />shaft. <br />28. a) An upstream raise will not be uxd for raising the anbatd~rrrnl. The base of the starter dike will be <br />ettlerged by going dotvnstream _ Ceet and sterUrtg a new embardanent with I.S:I upstream and <br />dowrotream slope. The new emberdatrrnt will tie into Ilse existing embenltinrnt end use the ugtream <br />slope es paA of Nc upstream slope of the new embenktnent. Tnaxial shear and pore pressure test, well <br />be done on samples from the existing starts ddce. <br />bl COM, Inc. cturendy plates to rue meterial'Lpattearn @om the eiuatittg taihrrgs pond as borrow for the <br />new emben}lttmt. The barrow material will bt toted as pert oC the design and specifications that will <br />be prepared for the trees embanlmrent Quality assurance testing will be included N the specificatioru <br />that will be given [o the division for approval prior to embenlonrnt corutruction. <br />cl Cross sections will be irrc]uded az put of the design apedfieepona. <br />dl Devgn apeciLeatton6 Cor the embankment well include liner vratalktion arsd quality aseursnbe <br />spenGcaeons. COM, enc. does nor plan to extend the 8na on cite ttpsverun side of die new <br />embersltrrtenl, but will include lira installation in the borrow area to a porn) about the 5nal design till <br />