CKD Capping and Remedial Action

Location: Spokane Valley, WA
Client: Confidential Aggregate Supplier
Contract Value: $2,304,087

AEC was chosen through a value-based proposal effort to perform a large remedial construction project in Spokane Valley, WA. Our client and their design engineer awarded the project to AEC due to our favorable business relationship, cost-effectiveness, a detailed work approach, and most importantly — our safety record! The scope involved excavating, transporting, consolidating and capping of Cement Kiln Dust (CKD) material, which was in direct proximity to residential areas, the Spokane River, and a well-trafficked walking trail. The CKD was transported from multiple locations around the property and capped to prevent further exposure.

Our crew and safety personnel took extreme precautions to mitigate hazards such as excess airborne kiln dust in order to prevent our employees and the neighboring community from being harmed. We sent approximately 3,800 tons of contaminated arsenic and lead waste material offsite for disposal.

During the performance of the project, thousands of yards of unanticipated large concrete block and debris were encountered, which required additional quantities of borrow material to be imported for backfill and also required AEC to manage additional disposal. In all, we imported 8,131 tons of bedding sand and 8,618 tons of topsoil. The crew also finish graded approximately 250,000 square feet prior to hydroseeding and project closeout.

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