Overview
The City of Centennial has instituted a new Grading, Erosion and Sediment Control (GESC) program. The new GESC program replaces the city's previous Erosion and Sedimentation Control criteria, and is required for all land disturbances.

The new program is a direct result of the city's National Pollution Discharge Elimination System (NPDES) Municipal Separate Storm Sewer Systems (MS4) permit, issued by the Colorado Department of Public Health and Environment, Water Quality Control Division. The permit requires the city to develop and implement educational and regulatory programs to address stormwater quality.

GESC Permit
One of the mechanisms for minimizing the amount of pollutants entering streams through the stormwater infrastructure is to control runoff from construction sites through the use of Best Management Practices (BMPs). The GESC Manual (available below) outlines when and what type of GESC permit is required, how to complete a GESC Plan, who completes a GESC Plan, and how to close out a GESC Permit.

All GESC (standard and low impact) are issued through SEMSWA.

Manuals
The manual may be viewed and downloaded below, or may be obtained from SEMSWA at 76 Inverness Drive East, Suite A, Englewood, CO 80112.

Note: If you have a fast internet connection, you may choose to download the zipped archive containing all of the files that are listed individually below. (To open archive after downloading: If you use Windows XP, simply double-click on the archive. If you use an older Windows version, you will need a third party unzipping software, such as Winzip.)

Complete GESC Manual, zipped (15.4 Mb)

• Table of Contents (32 kb)
• Section 1: Regulatory and Permitting (161 kb)
• Section 2: Submittal and Permit Process (175 kb)
• Section 3: Plan and Report Submittal Requirements (71 kb)
• Section 4: Grading Criteria, 10 Elements of a Successful GESC Plan, BMP Sizing (755 kb)
• Section 5: Field Process and Enforcement (135 kb)
• Section 6: General Construction, BMP Installation, Maintenance (1.6 Mb)
• Section 7: Project Close-Out (171 kb)
• Section 8: Low Impact GESC Permit (47 kb)
• Section 9: Single Family Residential Lot GESC Criteria (104 kb)
• Section 10: Special Requirements for Utility Construction (73 kb)
• Section 11: Temporary Batch Plant/GESC Permit (46 kb)

• List of Appendices (34 kb)
• Appendix A: Contact Information (4 kb)
• Appendix B: Pages 1 through 4 (1.1 Mb)
• Appendix B: Pages 5 through 9 (1.1 Mb)
• Appendix B: Pages 10 through 14 (943 kb)
• Appendix C: Example and Drawings Staged E-2 (525 kb)
• Appendix C: Example Drawing Low Impact (23 kb)
• Appendix C: Example Drawings Small Site E-1 (422 kb)
• Appendix C: Example Drawings Small Site G-1 (195 kb)
• Appendix C: Example Drawings Staged and Phased E-5 (794 kb)
• Appendix C: Example Drawings Staged and Phased G-1 (131 kb)
• Appendix C: Example Drawings Staged and Phased G-2 (573 kb)
• Appendix C: Example Drawings Staged and Phased G-3 (656 kb)
• Appendix C: Example Drawings Staged and Phased G-4 (436 kb)
• Appendix C: Example Drawings Staged and Phased G-5 (688 kb)
• Appendix C: Example Drawings Staged and Phased G-6 (711 kb)
• Appendix C: Example Drawings Staged and Phased G-7 (629 kb)
• Appendix C: Example Drawings Staged and Phased G-8 (744 kb)
• Appendix C: Example Drawings Staged E-1 (422 kb)
• Appendix C: Example Drawings Staged E-3 (508 kb)
• Appendix C: Example Drawings Staged G-1 (208 kb)
• Appendix C: Example Drawings Temporary Batch Plant B-1 (195 kb)
• Appendix C: Example Drawings Temporary Batch Plant B-2 (235 kb)
• Appendix C: Example Drawings Temporary Batch Plant B-3 (229 kb)
• Appendix C: Example Drawings Utility G-1 (195 kb)
• Appendix C: Example Drawings Utility U-2 (225 kb)
• Appendices D through U (260 kb)
• Appendix V: Noxious Weeds (694 Kb)

  Excel Worksheets:

• Appendix F: Engineer's Cost Estimate, Initial & Interim
• Appendix G: Engineer's Cost Estimate, Final