The Department of Environmental Protection (DEP) accepts category change requests throughout the year and transmits them on a quarterly schedule to other agencies for review (Washington Suburban Sanitary Commission, Maryland-National Capital Park and Planning Commission, etc.). The time between filing and a final decision on the change request varies, depending on the nature of the request and the policy issues involved. For inquiries requiring the response of a DEP planner, requestors will typically be contacted within 3 days.