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�nthtrf <br />CONSULTING GEOTECHNICAL <br />National King Coal <br />P.O. Bx 2905 <br />Durango, Colorado 81302 <br />Attention : Mr. Tom Bird <br />ENGINEERS AND MATERIALS <br />Subject: Installation of Water Monitoring Well <br />National King Coal Mine Expansion Project <br />Hesperus, Colorado <br />Mr. Bird, <br />TESTING <br />January 10, 2005 <br />D04007DR <br />This letter presents the subsurface soil and water conditions encountered, and details regarding <br />the installation of the monitoring well for the subject project. We installed the monitoring well <br />in a location designated by you. We have not been contacted to perform geotechnical <br />engineering services for the subject project. <br />We encountered soft silt and clay soil material from the ground surface to the bottom of the <br />installation boring. Subsurface free water was encountered at a depth of approximately six (6) <br />feet below the ground surface. The installation boring was advanced to a depth of eighteen (18) <br />feet below the ground surface. <br />The water monitoring well consisted of two (2) inch diameter, schedule 40 PVC pipe installed <br />to the bottom of the boring at eighteen (18) feet below the ground surface. The bottom <br />approximate ten (10) feet was slotted. Approximately two (2) feet of PVC well casing extends <br />above the adjacent ground surface. Pea gravel was packed from the bottom of the well to <br />approximately six (6) feet below the ground surface. The upper six (6) feet of the well was then <br />backfilled with powdered bentonite material. A six (6) inch well shroud was then placed over <br />the monitoring well. <br />Please contact us if your have any questions, or if we may be of additional service. <br />Respectfully Submitted <br />LAMBERT AND ASSOCIATES Reviewo by, <br />G <br />i' <br />� l <br />Jonathan P. Butler, P.E. David L. a er, P. E. <br />Staff Engineer Durango ffice Manager <br />P.O. BOX 3986 P.C. Box 0045 214 Bodo Dri7e <br />GRAND JUNCTION, CO MONTROSE, CO 81402 DURANGO, CO. 81301 <br />;970) 245 -4605 (970) 249 -2154 (970) 259 -5095 <br />