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August 2013 3 103- 81640A <br />Niobrara A (aka, Laporte or Fort Hayes member) limestone band (Secor 1998). The A band contained <br />thin shale layers in the screened interval of wells MW -2 and MW -3, based on the borehole logs. The <br />lithology at well MW -4 is not known due to the unavailability of a borehole log. Groundwater at the Site <br />has been thought to occur along the contact of the Codell sandstone and the Fort Hayes limestone (A <br />band) members. <br />Golder <br />i \10 \81640a\ 0400\ gwcharwellinstallfieldrep_ 09aug13\ gwcharwelhnstallfieldrep_09aug13 docx 9 Associates <br />