REV07750 - Laserfiche WebLink

Home Browse Search

ANACONDA Mlnarale Company ~-~~ 555 Seventeenth Street Denver. Colorado 80202 Telephone 303 293 4000 RE~EIV'~~ AU6191985 August 15, 1985 MINED LAND RECLAMATION DIVISION Mrs. Susan Mowry Reclamation Specialist Colorado Mined Land Reclamation Division 1313 Sherman Street Denver, Colorado 80203 Dear Susan: iiiiiiiiiiiiiiiiii Reference is made to the Permit Revision issued to West Elk Coal Company for its Mt. Gunnison Mine to construct the upper waste pile. In the Decision Document, Stipulation No. 14 directed West Elk Coal Company to install electronic tiltmeter tubes downslope from the toe of the proposed waste structure. The stipulation further required that within 30 days following approval of the revision, a plan for the installation of the tiltmeter facilities should be provided. This letter responds to that stipulation. Prior to the construction of the waste pile, two inclinometers shall be installed within 160 feet of the tae of the waste pile. One inclinometer will be located half-way between Monuments S1 and S4 as shown on Drawing No. MG-RC-001 included in the permit revision application. This inclinometer will be located on the southside of the existing collection ditch as shown on the referenced drawing. This site is 150 feet north of the toe of the waste pile. The second inclinometer will be located approximately 100 feet northeast of Monument S2 as shown on Drawing MG-RC-001 and is approximately 160 feet north of the toe of the waste pile. These locations are subject to change, if necessary, due to unforeseen conditions. These inclinometers will be similar to existing inclinometers currently in use on the Mt. Gunnison No. 1 mine site. Inclinometers will be PVC pipe type, supplied by Slope Indicator Company or a suitable equal. The readings will be taken with existing Sinco electronic equipment owned by West Elk Coal Company. The inclinometers will be installed in bedrock. During angering activities to install the inclinometers, the cuttings will be logged to determine the depth to bedrock. The inclinometers shall be read initially before the placement of any waste coal material. During the first year of waste pile operation, the inclinometers shall be read monthly. However, during times of inactivity on the waste disposal site (i.e., during winter months when the pile is inaccessible), readings shall not be taken. After the first year of operation, the frequency of readings shall be modified as necessary, based upon field experience. Readings shall be taken at least quarterly. During the Spring run-off period, readings will be taken as often as required. >N>CONO• Min er>n CDm D.ny n> 0..•e on o~ >~u m¢Birnne~DCamD>nY >NCO~d400~• id~d ]i