Laserfiche WebLink
blue <br />ribbon ,. <br />cool <br />company <br />~ ~~~~ <br />`,~' ~ <br />~pN ~~~~v~\<<Q~ <br />~~N ,~~pN <br />~~G~PMP <br />January 14, 1988 <br />Susan J. Mowry <br />Colorado .Mined_Land_Reclamati.on Division _ . . <br />1313 Sherman Street, Room 423 <br />Denver, Colorado 80203-2273 <br />Re: Quarterly Bench Stability Monitoring, File No. C-81-047 <br />Dear Susan: <br />.., <br />~I I I I~ ~I II ~ II ~~~~ ~I~ <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade, Colorado 81526 <br />(303)464-7951 <br />The fourth quarter 1987 bench stability survey was taken December 23, 1987. <br />Vertical angles were taken with a 20 second theodolite and elevations were <br />calculated using predetermined horizontal distances. A summary of this survey, <br />the last survey and the base line survey is as follows: <br />11-20-85 <br />09-24-87 <br />12-23-87 <br />S-1 6400.90 6400.73 6400.70 <br />S-2 6396.06 6395.89 6395.89 <br />S-3 6385.77 6385.55 6385.55 <br />S-4 6479.92 6479.53 6479.54 <br />S-5 6480.51 6479.85 6479.83 <br />S-6 6479.31 6479.00 6478.99 <br />S-7 6479.92 6479.54 6479.50 <br />Let, me know of there are any questions concerning these numbers. <br />Sincerely, <br />Larry M. Reschke, P.E. <br />Project Engineer <br />LMR:ver <br />