B.5.17 Water Quality Management Program

Dewatering Of Groundwater 

General Information.  For temporary dewatering of groundwater encountered during construction, the Contractor shall, Option 1, land apply all water generated at the location (s) indicated by the Contracting Officer's Representative on drawing (s) in accordance with Paragraph:  LAND APPLICATION or, Option 2, surface discharge all generated water in accordance with Paragraph: SURFACE DISCHARGE. 

a.  Hydrostatic Test Water.  Water generated during hydrostatic testing:  Option 1, shall be land applied at the location (s) indicated by the Contracting Officer's Representative on drawing (s) in accordance with Paragraph:  LAND APPLICATION or, Option 2, shall be surface discharged in accordance with Paragraph:  SURFACE DISCHARGE or, Option 3, shall be discharged into the new gravity sanitary sewer system at the location indicated by the Contracting Officer's Representative on drawing (s) in accordance with Paragraph:  SANITARY SEWER DISCHARGE. 

b.  Water Generated From Disinfection, Concurrent Disinfection/Hydrostatic Testing or Flushing of Lines.  Water generated from the flushing of lines after disinfection or disinfection in conjunction with hydrostatic testing: Option 1, shall be land applied at the location (s) indicated on drawing (s) in accordance with Paragraph:  LAND APPLICATION or, Option 2 ,shall be surface discharged in accordance with Paragraph:  SURFACE DISCHARGE or, Option 3, shall be discharged into the sanitary sewer system at the location indicated on drawing (s) in accordance with Paragraph:  SANITARY SEWER DISCHARGE. 

c.  Criteria For Disposal.  Prior to dewatering, hydrostatic testing, disinfection or flushing of lines, the Contractor shall submit a disposal plan to DPW and DECAM detailing the method of disposal for approval.  The disposal plan for Land Application shall include a sketch showing the construction site and the proposed location of the disposal of generated water.  The disposal plan for Land Application shall also include a description of the equipment which will be used for the removal of water and a description of filtration methods to be implemented as needed.  In addition, the date the discharge will begin, the duration of discharge, and the rate of discharge shall be provided.  If the method of disposal is Surface Discharge requiring a state issued permit, the documentation required for the application and issued permit will suffice as the disposal plan.  For Sanitary Sewer discharge the disposal plan shall include the rate and location of discharge into the sewer. 

1.  Option 1: Land Application - Land Application shall follow State requirements, however no permit will be necessary.  "Land application" implies that the Contractor shall discharge water at a rate which allows water to percolate into the soil.  No sheeting action, soil erosion, discharge into storm sewers, defined drainage areas, or discharged into the "waters of the State" shall occur.  The Contractor shall contact the Colorado Department of Health, Water Quality Control Division (phone 303-692 3608) to discuss the water quality parameters for chemical contaminants (such as chlorine), oil, grease and total suspended solids and shall ensure that all water intended for land application will meet the State requirements. 

2.  Option 2: Surface Discharge - Surface discharge shall be in accordance with Colorado's Pollutant Discharge Elimination System (CPDES) Construction Dewatering Permit #COG-70000.  "Surface discharge" implies that the water is discharged with possible sheeting action and subsequent soil erosion may occur.  Waters that are surface discharged may terminate in drainage ditches, creeks, or "waters of the State" and require discharge permit.  The State of Colorado requires a minimum of 30 days to process the permit application.  Prior to dewatering or discharging of water generated during hydrostatic testing and/or disinfection, the Contractor shall submit a copy of the completed application form, a copy of the Colorado CPDE Construction Dewatering Permit #COG-70000 issued by the State of Colorado for this contract and any subsequent reports and/or information required by the permit or State. 

3.  Option 3: Sanitary Sewer Discharge - Only water generated from the flushing of lines after disinfection or disinfection in conjunction with hydrostatic testing shall be discharged into the new gravity sewer system at the location indicated by the Contracting Officer's Representative. 

On-Site Storage of Fuels. 

No fuels shall be stored on-site by the contractor.  Fuel must be brought to the project site each day that work is performed. 

Permitting Summary 

The following table summarizes permitting requirements:

A brief description of each of the NPDES stormwater permits and Fort Carson requirements are as follows:

• Municipal Separate Storm Sewer System Permit
  The Fort Carson storm sewer system within the cantonment area operates under the authority of an NPDES MS4 permit that provides the overarching authority for discharge of stormwater from Fort Carson. Operation of the MS4 is permitted, provided that Fort Carson develops, implements and enforces a stormwater management program designed to reduce the discharge of pollutants from its MS4 to the maximum extent practicable to protect water quality. The program must implement six minimum control measures including industrial stormwater control, construction site stormwater runoff control, and post construction stormwater management (more details below), which can be found in the Fort Carson Stormwater Management Plan (SWMP) on the SEMS website. Per Garrison Commander Policy #XXX, adherence to these sections of Fort Carson’s SWMP is required when working in the cantonment area. 

• Multi-Sector General Permit
  Discharges of stormwater from a variety of Fort Carson industrial activities, such as vehicle and aircraft maintenance facilities and the wastewater treatment operations are subject to the MSGP standards. The permit requires development and enforcement of Stormwater Pollution Prevention Plans (SWPPPs) and monitoring for these industrial activities.

• Construction General Permit
  Discharge of stormwater from the following construction activities must conform with the requirements of the CGP: (1) construction activities that impact one acre or more of soil; (2) less than one acre of soil if that activity is part of a “larger common plan of development or sale” that is greater than one care; and (3) less than one acre of soil, but where the EPA has determined that the activity poses a risk to water resources.

Regulated construction activities include clearing, grading and excavating, resulting in land disturbance. In addition, the earth disturbing activity has to be part of a project to build, demolish, or replace a structure (e.g., building, road, pad, pipeline, transmission line, etc.) to trigger the need for permit coverage. Regulated construction activities do not include earth disturbance that is a normal part of the long-term use or maintenance of the property, such as routine maintenance that is performed to maintain the original line and grade, hydraulic capacity, or original purpose of the site.

Construction activities covered under the permit must prepare SWPPPs, file Notice of Intent documents, conduct routine inspections, and file Notice of Termination documents. All SWPPPs must be reviewed and approved by the Fort Carson Stormwater Program, prior to filing a Notice of Intent with the EPA. Plans, notifications, inspection records and other documentation required by the CGP must be prepared by the individual or entity with day to day operational control over the construction activity. Refer to the information sheet located on the above referenced SEMS website for step-by-step guidance with this process. 

B.5 CONSTRUCTION