A. General: All activities governed by these regulations shall be subject to inspection by the city. An approved set of plans must be available for review on site whenever work is in progress. It shall be the permittee's responsibility to keep the city notified of the progress of the project and call for all required inspections.
B. High Risk Sites: At a minimum, two (2) inspections shall be required for high risk sites: 1) after erosion and sedimentation controls have been installed, prior to ground disturbance; and 2) after the project has been completed, including revegetation. For sites which are active during the winter, two (2) additional inspections shall be required: 3) after the site has been prepared for the winter (typically in September or October); and 4) sometime in January or February to ensure that the erosion and sedimentation control measures are adequate and maintained. The permittee's design professional shall perform the inspections and submit inspection reports to the administrator.
C. Moderate Risk Sites: For moderate risk sites, the administrator shall determine what inspections are necessary. The administrator, or their designee, shall conduct the inspections for moderate risk sites.
D. Other Sites Where Risk Has Not Been Determined: For sites where notification is required or other situations where the site risk has not been evaluated, the administrator shall determine what inspections are necessary, if any.
E. Site Risk Assessments: Site risk assessments shall be based upon the following criteria:
1. Erosion Risk Assessment:
a. Slope: Slope, measured in percent, as an average across the area to be disturbed.
Gradient
| Point Value
| |
0 - 10 percent slope | 1 | |
11 - 25 percent slope | 5 | |
> 25 percent slope | 10 |
b. Soil K Factor: Soil K factor, for water erosion susceptibility, as indicated in the "Soil Survey Of Kootenai County Area, Idaho", or other supplementary study. The highest K factor within the proposed disturbed soil profile will be used. Soil type from the soil survey will be verified on site by physical description.
K Factor
| Point Value
| |
0 - 0.2 | 1 | |
0.21 - 0.4 | 3 | |
> 0.4 | 5 |
c. Proximity To Surface Water: Proximity to surface water or any feature which conveys water to surface water. Surface water includes all lakes, rivers, streams, wetlands, and similar features. Conveyance features may include natural or manmade ditches. Ponds, springs, or similar features that are contained within the property shall not be considered surface water features. Distance is measured along the slope from the closest boundary of the proposed disturbance to the conveyance or surface water feature.
Distance
| Point Value
| |
> 500 feet | 1 | |
201 - 500 feet | 5 | |
0 - 200 feet | 10 |
d. Amount Of Disturbed Area: Amount of disturbed area, expressed as a percentage of the parcel area. Areas to be disturbed during installation of utilities must be included.
Disturbed Portion
| Point Value
| |
0 - 33 percent | 1 | |
34 - 66 percent | 5 | |
67 - 100 percent | 10 |
e. Buffer Strip: If the project has a usable buffer strip, which provides the appropriate level of treatment for the type of project proposed, subtract ten (10) points.
f. Determining Risk Category: The points for each factor shall be added; the risk category shall be determined from the point total as follows:
0 - 9 | = | Low risk |
10 - 20 | = | Moderate or high risk; administrator makes determination based on experience in the area |
> 20 | = | High risk
|
2. Storm Water Risk Assessment:
a. Slope: Slope, measured in percent, as an average across the area to be disturbed.
Gradient
| Point Value
| |
0 - 5 percent | 0 | |
6 - 10 percent | 3 | |
11 - 15 percent | 6 | |
16 - 25 percent | 10 | |
> 25 percent | 15 |
b. Soil Permeability: Soil permeability, measured in inches per hour as indicated in the "Soil Survey Of Kootenai County Area, Idaho", or other supplementary study. The lowest permeability in the soil horizon shall be used. Soil type from the soil survey will be verified on site by physical description.
Permeability
| Point Value
| |
0.5 or greater | 0 | |
< 0.5 | 5 |
c. Proximity To Surface Water: Proximity to surface water or any feature which conveys water to surface water. Surface water includes all lakes, rivers, streams, wetlands, and similar features. Conveyance features may include natural or manmade ditches. Ponds, springs, or similar features that are contained within the property shall not be considered surface water features. Distance is measured along the slope from the closest boundary of the proposed disturbance to the conveyance or surface water feature.
Distance
| Point Value
| |
> 500 feet | 0 | |
201 - 500 feet | 5 | |
0 - 200 feet | 10 |
d. Impervious Area Ratio: Impervious area ratio, expressed as a percentage of the parcel area covered with impervious surfaces.
Coverage
| Point Value
| |
0 - 19 percent | 0 | |
20 - 40 percent | 5 | |
> 40 percent | 10 |
e. Total Impervious Area: Total impervious area, expressed in square feet.
Coverage | Point Value | |
20,000 or greater | 5 | |
< 20,000 square feet | 0 |
f. Drainage Crossing Proposed: If the project requires crossing a conveyance channel or drainage, add five (5) points.
g. Buffer Strip: If the project has a usable buffer strip, which provides the appropriate level of treatment for the type of project proposed, subtract ten (10) points.
h. Determining Risk Category: The points for each factor shall be added; the risk category shall be determined from the point total as follows:
15 points or greater | High risk | |
0 - 14 points | Low to moderate risk |
(Ord. 409, 7-11-2006)