§ 24.35.180. Geologic hazards—Additional requirements for geologic assessments in mine hazard areas.

In addition to the requirements in Chapter 24.18 TCC and TCC 24.35.130, the following shall be required for geologic assessments in mine hazard areas, as specified:

A.

The geological assessment for a mine hazard area shall be prepared by a geotechnical professional who is licensed as a professional engineer or engineering geologist with a minimum of four years of relevant professional employment, as determined by the director.

B.

The geological assessment shall be submitted in the form of a geotechnical letter when the geotechnical professional finds that no mine hazard area exists within 300 feet of the development proposal site. A geotechnical letter report shall, at a minimum, include the following:

1.

The letter shall be labeled, identifying the submittal as a "mine hazard geotechnical letter" and shall include all mandatory elements listed in TCC 24.35.130.

2.

The geotechnical letter shall be prepared under the responsible charge of a geotechnical professional(s) and be signed, sealed and dated by the geotechnical professional(s).

3.

A description of historical data and information required by Chapter 24.18 TCC and other information used in the assessment.

C.

The geological assessment shall be submitted in the form of a geotechnical evaluation when the geotechnical professional finds that a mine hazard area exists, but is located more than three hundred feet away from the proposed project area, and in their opinion, will not impact the subject site. A geotechnical evaluation report shall, at a minimum, include the following:

1.

The cover letter for the document shall clearly identify the submittal as a "mine hazard geotechnical evaluation" and shall include all mandatory elements listed in TCC 24.35.130.

2.

A site plan, as defined in TCC 24.35.130(H)(9).

3.

A description of the surface and subsurface geology, hydrology, soils and vegetation of the site and a list of the mine hazard indicators found on or in the vicinity of the site.

4.

A summary of the results, conclusions, and recommendations resulting from the geological assessment of the mine hazards on or in the vicinity of the site.

5.

A summary of the data and methods of analysis used to support the conclusions and recommendations presented in the geotechnical evaluation.

6.

The review authority may waive the requirement for this report if it can be proven that the mine hazard no longer exists.

7.

The geotechnical evaluation shall be prepared under the responsible charge of a geotechnical professional(s) and be signed, sealed and dated by the geotechnical professional(s).

8.

A description of historical data and information required by Chapter 24.18 TCC and other information used in the assessment.

D.

The geological assessment shall be submitted in the form of a geotechnical report when the geotechnical professional finds that a mine hazard area exists within three hundred feet of the proposed project area or when the results of the site investigation by the geotechnical professional indicate that mitigation measures are necessary in order to construct or develop within a mine hazard area. A geotechnical report shall, at a minimum, include the following:

1.

The cover letter for the document shall clearly identify the submittal as a "mine hazard geotechnical evaluation" and shall include all mandatory elements listed in TCC 24.35.130.

2.

A site plan, as defined in TCC 24.35.130(H)(9).

3.

A description of the surface and subsurface geology, hydrology, soils and vegetation of the site and a list of the mine hazard indicators found on or in the vicinity of the site.

4.

A description of the analytical tools and processes used to develop the geotechnical report.

5.

A detailed description of any prior grading activity, soil instability, or ground failure.

6.

Data from surface exploration such as borings, drill holes, test pits, wells, geologic reports, and other relevant reports or site investigations that may be useful in making conclusions or recommendations about the site under investigation.

7.

A description of historical data and information required by Chapter 24.18 TCC and other information used in the evaluation, together with sources, to include:

a.

Topographic maps at a scale and contour interval of sufficient detail to assess the site. The site boundaries and proposed development site shall be overlain with the mine plan view map.

b.

Aerial photography, as appropriate.

c.

Geologic cross-sections and other illustrative data, as appropriate.

8.

A summary of the results, conclusions, and recommendations resulting from the geological assessment of the mine hazards on or in the vicinity of the site.

9.

The review authority may waive the requirement for this report if it can be proven that the mine hazard no longer exists.

10.

The geotechnical report shall be prepared under the responsible charge of a geotechnical professional(s) and be signed, sealed and dated by the geotechnical professional(s).

(Ord. No. 14773, § 3(Att. B), 7-24-2012)