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The uppermost bedrock unit in the vicinity of Elk River is shown on Figure 3. The Mt. Simon- <br />Hinckley Formations and the Eau Claire Formation are the uppermost bedrock [.[nits over most of Elk <br />River. the Ironton-Galesville Sandtone is the uppermost bedrock in the southeast corner of Elk River. <br />Approximately 4 miles west, near Big Lake, the uppermost bedrock unit is Precambrian Crystalline <br />rocks, which marks the western edge of the Hollandale Embayment. <br />The depth to bedrock in Elk River is generally greater than 50 feet and in several areas, the depth to <br />bedrock exeeds 200 feet, as shown on Figure 4. The brown and orange areas shown on Figure 4 <br />P:\Mpls\23 MN\71\2371 l05 Water Supply Alternative Study\FinalDeliverables\AI[ernatives_Report_final.doc <br />Figure 4 Approximate Depth to Bedrock (feet) <br />