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BRUCE FLOROUI8T, P.E. - ENGINEERING GEOLOGIST 77697 U.S. Y.IGHWAY 550, MONTROSE, CO 87407 • 303449-4 7 42 INTRODfJCTION: The purpose of this report is to present the ,,rcliminary analyses of the geologic and geotechnical characteristics of the prop~.•.-- spoil disposal area, The area under investiyation is directly across the Harvey Gap drainage from the East Side Coal Mine and will recieve spoil from that mine. The information contained in this report presents the results of field investiy.~cions to date by the principal investigator, Bruce F'lorquist as well as the geotechnica.i services performed by Camber,. and Associates. SITE CHARACTERISTICS: As mentioned above, the subject site ]~~~s across the valley from the East Side Coal Mine and about 500'downstream from the Grasp Valley Reservoir (sometimes ca-led Harvey Gap Reservoir). The .,,te consists of a relatively small east-west trending valley that drains to the larger Harvey Gap Drainage immediately to the east of the site. It is bounded on the East by a canal (outlet 'or Grass Valley Reservoir and on the north and south by steeply • ~9ipping sandstone outcrops of the Mesa Verde ycoup. ine site is covered witl tall sage and ~~raases and is rimmed with Utah Juniper and Pinon Pine The valley had been the location of a tipple for a mine that was abandoned in the 1950's- The tipple has since been removed and there is no siyn of any struct.t-es on the site. There are some areas of wasted coal and spoil scattered about, but these are less than 3 feet thick 1 will be removed when the site is prepared for the spoil from he East Side Mine. The oJ.d coal mine lies in the next val]„y to the north and poses no hazards to the proposed faci.tity as the e.bandoned mine reportedly went into the coal sPnm alon,i .trike and the coal was teen mined. from the "back". There is no ,. vid n.:e that the s.••r was ever mined drnandip. SURCA~'I: AND SUDSURFACE DRAINAGE: The sire con:~sts of a very short „].ley that drain,: from the h+oher hills to the west. Site inspection :owed that there were no springs, seeps or ponded water in the vicinity of the site. P can be seen from the test drilling no ground ~.Jater was encounte d in any of the test holes. The testing was done soon after the last snow melt and within a fert days after a relatively heavy rain. The fact that no evidence of group. water cr recent surf,.ce water movement could be seen is a fair indication thu • this site should not be subject to ground water or :surface water problems. As mentioned earlier, the canal for the outlet of .ie Grasp Valley Rescrvoi.r forms the eastern boundary of the area, but this canal is sufficiently removed from the spot: dispor.vl site (horizontally anc•. vertically) so teat it should pose no problems to subsurface incursion of water below the spoil pile. The natural drainage from this canal is 'o the east, away from the proposed spoil pile.