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To assist in the design of engineering practices, the following standard drawings, details, guides, spreadsheets, etc. are approved for appropriate use in Pennsylvania. All technical resources are available to the general public, and while all have been examined for technical adequacy the responsibility for proper application remains with the user. Before using any of the technical resources, the designer should verify they are adaptable to the site and that the design limitations are not exceeded.  All standard details and drawings must be part of a specific site design that is reviewed and approved by an individual with the appropriate approval authority.