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,, ~~~ I~ I II~~ I~~ N C1G FINANCIAL, INC. January 13, 1992 Mined Land Reclamation Division 1313 Sherman Street, Room 215 Denver, CO 80203 Attention: Ms. Shawn Smith Reclamation Specialist Re: Coal Ridge No. 1 Mine Permit C-84-065 Stipulation- 17_ Abandonment of Monitor Well OW-4L Dear Ms. Smith: 74 i6 Enet Arkansas Acr.. ~ 10+ Denver, CO 80231 Telrphone 303/331-3877 Fax 303:337-1989 ~=- l =... -.+.... JAN 1 5 199 hii~~:a ~ ^~d n„ _,, ....., . Stipulation 17 of the mining permit for the Coal Ridge No. 1 mine requires the filing of a report regarding the loss of the cap- tioned monitoring well. Although the information has been submitted previously, in con- junction with the adequacy review of the permit, I believe it was never done specifically to satisfy Stipulation 17. Monitoring well OW-4L was originally drilled by Chen and As- sociates in late 1983 as part of a geotechnical investigation of the permitted property for the various facilities proposed at that time. The geotechnical hole TH-4 was then completed as a monitoring well, using 2 inch PVC, and was numbered OW-4L. TH-4 was drilled to 75 feet through mostly clays and sandy clays, but PVC pipe was installed to approximately 22 feet only with the remainder of the hole abandoned (see attached well logs). OW-4L was used as a shallow groundwater monitoring well from 1984 to late 1989 when it was found to have been destroyed. The well was located at the edge of a cultivated and irrigated field which was used for grazing of livestock. In October 1989, the well could not be located and was presumed to have been destroyed. Apparently, either through cultivation and/or grazing, the PVC pipe was broken off below ground surface and the surface reworked so that there was no evidence of the well. A search has been made on several occasions, including with the help of the rancher, without identifying the well. PPdlal,;;-~1~1,~~