Exhibit A4 - Figure 3 MW-D1 log.pdf

The document contains two Field Well Installation Diagrams and a Soil Boring Log for MW-D1 monitoring wells at Fermi National Accelerator Laboratory in Batavia, Illinois. The technical drawings detail the construction specifications for two monitoring wells (MW-D1/casing and MW-1), including:

Monitoring well specifications include PVC pipe with 4-8 inch diameter, well screen details, installation depths ranging from 15 to 40 feet, and specific construction materials like bentonite pellets, pea gravel, and concrete. The soil boring log documents the geological strata, which includes layers of silty clay, sandy silt, and clayey silt in various color gradations (brown and gray) from surface elevation to a depth of 40 feet. The wells were drilled by Baker on 3/31/88 and 4/4/88 using a D Rig and Go Tract drill rig, with the drill crew consisting of Carlson & Gevock.