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Lorennto Canyon Mine - Graartdwater Terhnira! ReOOrt • also occurs in the form of influent streams. A major influence to regional recharge in the area is [he presence of fractures in the rock. This fracturing is mainly associated with igneous intrusives, which have not been encountered in the permit area. • TABLE GW-9 LORENCITO CANYON MINE PRECIPITATION FOR MINE SITE (INCHES) Month North Lake 8,810 Ft. MSL Trinidad Airpott 5,740 Ft MSL Lorenci[o 6,600 FL MSL Lorencito 7,200 Ft. MSL January 0.92 0.38 0.53 0.64 February 1.00 0.44 0.60 0.71 March 1.66 0.77 1.02 1.19 April 1.75 0.97 1.19 1.34 May 2.21 1.86 1.96 2.03 June 1.42 1.46 1.45 1.44 July 3.47 2.03 2.43 2.71 August 2.96 2.00 2.27 2.46 September 1.44 1.07 1.17 1.25 October 1.31 .074 0.90 1.01 November I.OI 0.69 0.78 0.84 December 0.92 0.52 0.63 0.71 Annual 20.07 12.93 14.94 16.32 Note: Eztrapola[ion between North Lake and Trinidad based on elevation difference. Discharge in the area is mainly through evapotranspiration (ET). According to Howard (1982) ET in the area is approximately 46.4 inches greater that precipitation (from Trinidad airport data). This amount of ET would create a large deficit in the permit area hydrologic budget. Other loss mechanisms include springs and gaining streams with springs in the area generally originating from either formational contacts (Poison Canyon/Raton), or confined coals. Regionally, potentiometric surface gradient is thought to be to the east, and in the site area [o the east-northeast. Figure GW-6 depicts a potentiometric surface map based upon the work of Howard (1982). To develop this map, over two hundred wells were inventoried to determine location and elevation. This data is included in Appendix GW-4. This map indicates that the recharge to the aquifers in the site area occurs in the topographic highs and discharges to the Purgatoire River. Groundwater 475\December 9. 1996 3~