Section 906.18 - Final decision of the Department(a) The Regional Administrator's written decision to adopt, reverse, or modify an NAO decision or revised decision pursuant to § 906.17(c) is the final decision of the Department for the purposes of judicial review.(b) If the Regional Administrator does not take action pursuant to § 906.17(c)(1) , NAO's decision issued pursuant to § 906.15(a) or revised decision issued pursuant to § 906.16(d)(2) or (e) becomes the final decision of the Department for the purposes of judicial review 30 days after service of NAO's notification under § 906.17(a) , or upon expiration of any stay issued by the Regional Administrator pursuant to § 906.17(c)(2) .(c) The office that issued the initial administrative determination shall implement the final decision of the Department within 30 days of service of the final decision issued pursuant to § 906.18(a) , or within 30 days of the decision becoming final pursuant to § 906.18(b) , to the extent practicable.