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"~l <br />~-~ <br />= II I II II IIII IIIIIIII <br /> <br />E G. W~FITE P.E. <br />1650 M. STREET PENROSE, COLORADO 81240 "~ b°' "`f "° <br />March 28, 1990 ,,AR ' ~J ,,~,~~ <br />Mr. Larry Routten FAI~~~r.:a ~~,.; <br />Senior Reclamation Specialist RECL; `"°''`~`~ '~`"' ;i <br />Mined Land Reclamation Division <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Subject: Twin Pines No. 2 Mine, Permit No. C-83-058, <br />Certification of the North Spoil Area, 1st. quarter 1990 <br />Dear Mr. Routten: <br />I Lawrence G. White P.E. being duly registered as a Professional <br />Engineer in the State of Colorado, registration no. 7964, do <br />hereby certify to the following information concerning the North <br />Spoil Area at the Twin Pines N0. 2 Mine Site: <br />1. Inaccordance with rule no. 4.09 of the Rules and Regulations <br />of the Mined Land Reclamation Division subject spoil pile was <br />inspected for compliance with the Mining Permit and for <br />stability. Inspections were carried out several times during the <br />period from January 1,1990 to March 28, 1990. As required by the <br />mining permit, testing and design of final fill slope was <br />initiated during the period. Insitu density tests were taken and <br />spoil samples for triaxial sheer tests and proctor analysis were <br />collected on March 4, 1990 by Lincoln-Devore personnel. The <br />results of the testing is being analyzed at this time. At the <br />time of testing the level of compacted spoil was approximately 2 <br />feet below the top of the toe dike. A good portion of the area <br />was covered with piles of spoil dumped from a truck. Sufficient <br />area was exposed for obtaining density samples. The dumped spoil <br />was leveled and compacted by the March 26 inspection. The average <br />level of the pile is now approximately 1 foot above the level of <br />the toe dike. Laboratory test results and the stability analysis <br />will be forwarded to the Division when received from Lincoln <br />Devore. Lincoln Devore personal were also on the site March 28 <br />taking additional measurements for the final analysis. <br />2. To the best of my knowledge and belief the spoil pile is being <br />constructed inaccordance with the procedures outlined in the <br />permit application and good engineering standards. Procedures <br />will be reviewed and modified as necessary when test results and <br />recommendations are received from Lincoln Devore. <br />If any additional information is required or questions arise <br />please advise. <br />ver truly y~Lr/ <br />La rent G~ W ite P.E. <br />1 <br />