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relatively short distances away from the slurry wall. At similar sites within the South Platte <br /> River alluvium, mounding and shadowing groundwater elevation changes of 2 to 3 feet have <br /> been observed adjacent to constructed slurry walls. However, the groundwater elevations <br /> generally return to normal gradients within several hundred feet of the slurry walls. <br /> . LARIMER AND WELD _ <br /> ' '��' IRRIGATION DITCH <br /> OFFSET <br /> BASSOC LATE <br /> ¢� INFRASTRUCTURE <br /> - <br /> 1 <br /> LAMB A � '`�° Soo•a�sscr <br /> �$VJ,• 3. Q 15008 , yr 598 <br /> 60245 ( I ti <br /> �. \.' '` — <br /> CACHE LA <br /> c� r� POUORE <br /> 11(J _/_�}� RIVER <br /> -..FORT GOLLI RIGATION ._. ..,...... <br /> Q ` CANAL DITCH dA OCIATI_ <br /> RUCTURE 4SEj(dS <br /> 2�k t SW orTSET v I <br /> � ■ LAMB B <br /> I <br /> i ,-4 <br /> -. <br /> LAMB C <br /> f <br /> Drawdow, g <br /> Boundan R :d,• e` <br /> — —1- -- ------ — - 516 _ 7 024-1" 4 <br /> Estimated Significant Drawdown NORTH a <br /> Boundary(650 feet from pit edge) r <br /> 3 Proposed Monitoring Well Locations <br /> 500 0 500 1000 1500 Feet <br /> ( IN FEET) <br /> Figure 4. Estimated Significant Groundwater Drawdown Boundary and Proposed <br /> Monitoring Well Locations <br /> Immediately upgradient (west and north) of Lamb Lakes, properties owned by Martin Marietta <br /> Materials and Richard Connell primarily contain active mining operations or rural agricultural <br /> activities. To the west of Lamb A and Lamb B, the land surface is, and appears to have <br /> historically been, about 5 to 10 feet above the normal groundwater elevation. The relatively high <br /> depth to groundwater would help to minimize any surface impacts from potential groundwater <br /> (blue earth Page 10 of 12 <br /> SOLUTIONS <br />