LONGVIEW, Washington (From news reports) -- State inspectors visited the Nippon Dynawave mill just over a month before a tank collapse killed 11 workers, according to newly released records.

The documents, obtained through a public records request, show the Washington Department of Ecology conducted a "dangerous waste compliance evaluation inspection" on April 16, just 40 days before the G Tank collapsed at the Longview pulp mill.

The 55-page inspection report does not mention the G Tank specifically. However, it cites Nippon Dynawave for seven minor violations related to the labeling and storage of dangerous chemicals. They included containers of dangerous waste -- including some 55 gallon drums -- that were not clearly marked. In one case, a container of used oil was not properly sealed shut.

Despite those violations, the report concludes the company was "not a significant non-complier," indicating the plant was largely in compliance with state regulations at the time of the inspection.

In a separate document, Nippon Dynawave told the Department of Ecology that the May 26 spill flooded 12 acres of the property with caustic white liquor, a chemical used in the pulp-making process. The company said seven of those acres are "suspected to be compromised as a result of the event.

State and federal agencies are continuing to investigate the cause of the deadly collapse.