SEMSWA has adopted and revised the Grading, Erosion, and Sediment Control (GESC) Manual for work in the City of Centennial and utilizes the Arapahoe County adopted GESC Manual for work within SEMSWA's service area in Unincorporated Arapahoe County. Please reference the appropriate Manual from the list below. All documents are provided in PDF unless otherwise noted. To determine review and permitting fees associated with work in either the City or County, please click here.