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BARR ENGINEERING COMPANY Page A-2 \\barr.com \projects\Mpls\23 MN\82\23821219 3M Lake Elmo Phase Is\WorkFiles\1602921240002\Appendix A\PHIESA_Appendix A_1602921240002.docx Anticipated groundwater depth/flow direction: The anticipated groundwater depth/flow direction is based on the log for the sealed well (Ref. 5a), Washington County Geologic Atlas (Ref. 2a), and information from MDH’s 2007 Memo outlining a designation special well construction area (Ref. 5 f). Shallow groundwater at the Property likely occurs in the alluvium present from 0 to 25 feet bgs, and the groundwater in the St. Peter Sandstone is approximately 60 feet bgs. The shallow groundwater reportedly flows to the south /southeast (Ref. 2a), although the flow direction of the shallow groundwater is believed to be influenced by local discharge/recharge points, the presence of confining layers, and groundwater withdrawals and land use in nearby areas . Groundwater levels and flow directions are also influenced by recharge from losing streams and by natural discharge to local lakes and streams. Regional groundwater flow in the St. Peter sandstone and the Prairie du Chien group, is generally to the southwest. III. Municipal Information & Utility Service to Property The locations of Property utilities (wells, septic systems, sewer lines ) are shown on Figure 2. Water Supply Municipal water supply and intake location(s): The City of Lake Elmo’s water supply comes from the Prairie du Chein and Jordan aquifers (Ref. 4c). Property potable/process water suppl y: The Property is not connected to municipal water (Ref. 4c). Have other potable water supplies serviced the Property? If yes, describe : No. (Ref. 4a) Sanitary Service Type of sanitary service for the Property : The Property is not connected to sanitary service (Ref. 4c). Have other methods of sanitary service been used at the Property? No. (Ref. 4a) Evidence of current onsite septic systems or drain fields: No evidence of septic systems or drain fields were observed (Ref. 5b). Stormwater Management Is the Property serviced by storm water drains, storm sewers, ponds or drainage ditches? No. (Ref. 4a). A storm sewer intake and manhole were observed on the access road to the Public Works facility. Culverts and ditches were also observed in the field on the Property (Ref. 5a). Do any neighboring properties discharge to the Property? Stormwater discharges to the Property from a culvert located on the west site of the Property near the access road to the Public Works facility. The origin of the stormwater is unknown (Ref. 5b).