CHA was contracted by Lockheed Martin (a contractor to the United State Environmental Protection Agency) to perform site assessments of selected coal combustion surface impoundments (Project 0-381 Coal Combustion Surface Impoundments/Dam Safety Inspections). As part of this contract, CHA was assigned to perform a site assessment of Northern States Power Companys (NSPC, a subsidiary of Xcel Energy, Inc.) Sherburne County Power Station, located in Becker, Minnesota as shown on Figure 1 Project Location Map. CHA made a site visit on September 16, 2009 to inventory coal combustion surface impoundments at the facility, to perform visual observations of the impoundment dikes, and to collect relevant information regarding the Bottom Ash Pond, Pond No. 1, Pond No. 2 and Pond No. 3 impoundments.