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il< River Landfill - supplemental phase xxx Hydrogeologic Evaluation work Plan Msw Expansion Area.t~ <br />From: Matthew Ledvina [mlledvina@nrginc.com7 <br />sent: Thursday, August 19, 2004 3:31 pM <br />To: 7ohnson, Terry; srohlf@ci.elk-river.mn.us <br />Cc: dave.lucas@co.sherburne.mn.us; jeidem@geomatrix.com; john.elks@pca.state.mn.us <br />Subject: Elk River Landfill - supplemental Phase xxx Hydrogeologic Evaluation worst <br />Plan, MSW Expansion Area <br />Hi Terry and Steve: <br />As requested, x have completed a review of the Elk River Landfill - supplemental <br />Phase xxx Hydrogeologic Evaluation work Plan, Msw Expansion Area. This work plan <br />was developed in response to MPCA and City of Elk River comments concerning the <br />March 2004 Hydrogeologic Evaluation Report. <br />xn general, the work plan will provide important supplemental information for the <br />need to develop a component of the monitoring system targeting the lower outwash <br />deposit. Figure 2 presents the proposed locations for deep soil boring and <br />piezometer construction. To provide complete areal coverage of the expansion area, <br />it is suggested that an additional nested piezometer be constructed at the location <br />of-316 owA. Thzs will provide better elevation control on the piezometric surface <br />and enable a more comprehensive flow interpretation for the lower outwash. <br />With the additional geologic information collected at the 316 OwA location will also <br />provide information on the thickness of the till layer, the soil boring at the s6S1 <br />location would not be required (in my opinion). Adjacent borings (s65 and s66) have <br />tagged the top of ti 11 in this area and the only additional information for the 6651 <br />location would be the till thickness. <br />I want to state that discussions relating to the spacing of groundwater monitoring <br />wells along the compliance boundary and the need for additional wells along an <br />interim development boundary have not been completed. These discussions are <br />deferred at this time and additional wells may need to be constructed in the future <br />for the implementation of a complete and acceptable groundwater monitoring system <br />for the Msw expansion area. <br />x have contacted john Elks at the MPCA to discuss my review of the work Plan. john <br />indicated that he will-forward comments next week. x am open to discussion on the <br />details concerning the scope of the work Plan. please give a call with questions. <br />Regards, Matt. <br />Matt Ledvina <br />mlledvina@nrginc.com <br />612.339.2316 Direct <br />612.325.8589 Cell <br />612.347.6780 Fax <br />Page 1 <br />