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than 20 feet. Similarly, Robson (2000) suggest that the alluvial groundwater gradient is <br /> about 0.005 (0.5 feet decline per 100 feet of horizontal distance) from northwest to southeast <br /> across the site. <br /> Groundwater information collected from the site exploration data (Empire 1975) indicates that <br /> the alluvial groundwater elevation on the site is between 4994 and 5013 amsl with a saturated <br /> thickness ranging from 10 to 17 feet and averaging about 15 feet. Based on results from the <br /> subsurface investigation, published reference material, and well data from the SEO database, <br /> typical groundwater elevations were estimated for the site and are presented as surface contours <br /> in Figure 2. The alluvial groundwater contours in Figure 2 are considered typical, may not <br /> correlate exactly to the bore hole groundwater elevations collected at the time of the 1975 <br /> subsurface investigation, and would be expected to fluctuate seasonally by several feet. <br /> lip <br /> : CFCHE LA <br /> i Rooaos€o i Pquor INVER <br /> f PERMIT BDU DARY_ '^ t•- "✓ I ... <br /> i f <br /> PROPOSED - <br /> a PF�JT BOUNPfj <br /> �,� 1° <br /> R°�CoLUNs IRR1cATio <br /> CANAL DITCH 6 ASSOCIATEDINF <br /> URE <br /> RTHUR�RRIIIOON CCOUMPANY)Y)' !� LAMB A <br /> 1 <br /> A CZ 'V1 I '.lm CACHE LA � �� 0/ <br /> �► J/ _v�iSi `( POUDRE RIVER <br /> POUDJj E RI <br /> ✓" J <br /> A <br /> • � f <br /> "OVItRHEAD—� I ♦ F^.SF." ..- - / �� . <br /> �OWER/UTILITY _ ♦ �1W �' F <br /> LIf E 6 POLE$•1 ♦ ♦ ��`a�.�'s},'.�o <br /> "qJ <br /> PROPOSED <br /> PERMIT BpUNDARY <br /> n =a (�((�� <br /> �ROPOSED ♦ ,I _1 5QUO <br /> -PE PM IT IWUNDARY <br /> POOPOSEU <br /> \ \ IPERMITBOUNDAI, <br /> ■ Estimated Pre-Mining ♦ ` �� j�'X # <br /> ■ Groundwater Table -"% `` �. vt <br /> (data from Empire 1975) 5010 f L <br /> v <br /> Not to Scale �J), <br /> PRo �*.Eb 5000 <br /> "pEJ2M1T UN Y, r <br /> Figure 2. Lamb Lakes—Pre-Mining Groundwater Table Estimate <br /> blue earth Page 5 of 12 <br /> SOLUTIONS <br />