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<br /> <br /> <br />Field Investigation Report <br />Old Snelling Avenue and County Road E Improvements <br />WSB Project No. R-015447-000 Page 3 <br /> <br />(MDA) What’s in My Neighborhood (WIMN) and Minnesota Well Index (MWI)) were reviewed. <br />Multiple adjacent MPCA listings were identified along the Project Corridor indicating the presence <br />of a hazardous material spill or release. Therefore, a Phase I ESA was recommended to further <br />assess environmental risks at the Project Corridor prior to reconstruction. <br /> <br />2020 Phase I ESA <br /> <br />The 2020 Phase I ESA was prepared in conformance with ASTM Practice E1527-13. The PAH- <br />and DRO-impacted soil encountered during the 2018 Bridge 62J17 Replacement and the <br />petroleum odor noted during the 2019 Geotechnical Borings (discussed above) were considered <br />RECs associated with the Project Corridor. Further investigation (e.g. Field Investigation) of the <br />Project Corridor was recommended prior to roadway improvements for future environmental <br />planning purposes. <br /> <br />1.2 Scope of Work <br /> <br />The following tasks were conducted as part of this investigation to evaluate the current <br />subsurface soil, groundwater, and soil vapor conditions at the Project Corridor: <br /> <br />· Completed private and public utility locates through Gopher State One Call (GSOC) <br />service prior to boring advancement. <br /> <br />· Advanced 14 borings to depths of 16 feet below grade using a push probe drill rig for soil <br />and/or groundwater sample collection. <br /> <br />· Advanced two (2) borings to depths of 4 feet below grade using a push probe drill rig for <br />soil vapor sample collection. <br /> <br />· Assessed soil samples for visual and/or olfactory indications of contamination and <br />screened soil samples for organic vapors using a photoionization detector (PID) equipped <br />with a 10.6 eV lamp. Soil types and profiles were recorded on boring logs in general <br />accordance with the Unified Soil Classification System (USCS). <br /> <br />· Utilized Global Positioning System (GPS) technology to record boring and soil vapor <br />sample locations. <br /> <br />· Collected and submitted select soil samples for one or more of the following laboratory <br />analyses: <br /> <br />o DRO using the Wisconsin Method; <br />o Gasoline range organics (GRO) using the Wisconsin Method; <br />o Benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA Method 8260D; <br />o VOCs using EPA Method 8260D; <br />o Lead using EPA Method 6010D; <br />o Resource Conservation and Recovery Act (RCRA) Metals using EPA Method <br />6010D/7471B; <br />o Polynuclear aromatic hydrocarbons (PAHs) using EPA Method 8270E; and <br />o Polychlorinated biphenyls (PCBs) using EPA Method 8082A. <br /> <br />· Collected and submitted select groundwater samples for the following laboratory <br />analyses: <br /> <br />o DRO using the Wisconsin Method; <br />o GRO using the Wisconsin Method; <br />o VOCs using EPA Method 8260D; and