Idaho Admin. Code r. 58.01.16.007
Guidance documents are to be used to assist both designers and reviewers in determining a reasonable way to achieve compliance with the rules. Nothing in these rules makes the use of a particular guidance or guidance document mandatory. If the plans and specifications comply with applicable facility and design standards as set out in these rules, Section 39-118, Idaho Code, requires that the Department not substitute its judgment for that of the design engineer concerning the manner of compliance. If the design engineer needs assistance as to how to comply with a particular rule, the design engineer may use the referenced guidance documents listed in Section 008 for that assistance. However, the design engineer may also use other guidance or provide documentation to substantiate his or her own professional judgment.
Idaho Admin. Code r. 58.01.16.007