§ 8.12.4. Water quality during construction.

Water quality impacts during the construction phase of a project may include erosion and sedimentation; deposition of wind-blown debris; and release of hazardous materials such as fuels or other chemicals used in the construction process.

Applicants for developments must submit the following documents regarding control of water quality impacts during construction (the Colorado Department of Public Health and Environment determines the minimum acreage amounts of disturbed soil where stormwater management plans, stormwater discharge permits and stormwater management reports are required):

A.

Preliminary and final drainage reports as specified in the Larimer County Stormwater Design Standards are required. The county engineer must review and approve the drainage reports.

B.

If the construction project will disturb an area in excess of the minimum acreage amount specified by the Colorado Department of Public Health and Environment, a stormwater management plan prepared in accordance with the applicable stormwater management plan (SWMP) guidance document as provided by the Permits Unit of the Water Quality Control Division, Colorado Department of Public Health and Environment, is required. The purpose of a stormwater management plan is to identify potential pollution sources, select appropriate best management practices and design implementation strategies. Guidelines regarding best management practices are included in the "Construction Guidance Document." The county department of engineering and the county department of public health and environment must review and approve construction stormwater management plans.

C.

If the construction project will disturb an area in excess of the minimum acreage amount specified by the Colorado Department of Public Health and Environment, a Colorado Construction Stormwater Discharge Permit is required prior to starting construction.

D.

If the construction project will disturb less than the minimum acreage amount specified by the Colorado Department of Public Health and Environment, a stormwater management report is required that contains the following information:

1.

A description and map outlining proposed construction activities.

2.

Identification of potential pollution sources, including sediment and chemical sources.

3.

A description of appropriate best management practices to be implemented before and during construction activities to prevent or minimize release of pollutants. Guidelines regarding best management practices can be obtained from the county planning department.

4.

A discussion of how the best management practices will be implemented.

E.

The county engineering and health and environment departments will review construction stormwater management reports and recommend they be accepted or rejected prior to the public hearing process.

(Res. No. 11122002R001, 9-23-2002; Res. No. 12062005R012, Exh. A, Item 3, 12-6-2005; Res. No. 11202007R002, Exh. A, 11-20-2007; Res. No. 01292008R003, Exh. A, 1-29-2008)