§ 24.35.100. Geologic hazards—Minimum standards for special reports—Structural mitigation plan.

A.

The structural mitigation plan shall be prepared by a registered design professional, as defined in TCC 14.37, with demonstrated geotechnical experience, geologist, or engineering geologist licensed to practice in the State of Washington.

B.

The owner or agent shall provide for review, a minimum of two copies of a structural mitigation plan, including but not limited to, the following information:

1.

Project Information.

a.

Permit and/or application number;

b.

Tax parcel number;

c.

Plan number or other identification of project.

2.

Registered Design Professional Information.

a.

Name, mailing address, and phone number of registered design professional;

b.

Type of registration of the design professional;

c.

Date the design was completed.

3.

Project Site Plan Information.

a.

Existing and proposed topographic contours at two-foot intervals;

b.

Erosion control and drainage measures for the construction period and final disposition of the parcel;

c.

Proposed slope stabilization methods consistent with Chapter 24.15 TCC, if necessary.

4.

Soils Investigation Report. The structural mitigation plan shall include a soils investigation report conforming to the provisions of the Thurston County Building Codes, as amended. The report shall include, but not be limited to, the following information:

a.

A plot showing the location of test borings and/or excavations.

b.

A complete record of the soil samples.

c.

A record of the slope profile before and after construction drawn at an identifiable scale.

d.

Elevation of the water table, if encountered.

e.

Recommendations for foundation type and design criteria, including but not limited to: bearing capacity of natural or compacted soil; provisions to mitigate the effects of expansive soils; mitigation of the effects of liquefaction, differential settlement and varying soil strengths; and the effects of adjacent loads.

f.

Expected total and differential settlement.

g.

Pile and pier foundation information in accordance with TC building codes, as amended.

h.

Special design and construction provisions for foundations located in adverse soils, as necessary.

i.

Compacted fill material properties and testing in accordance with the TC building codes as amended.

5.

Construction Drawings. Drawings submitted for review shall be annotated to call out and identify location of details, sections, and other specifics of the plan.

6.

Details and Section Drawings. The registered design professional shall provide all details and sections needed to communicate the specific requirements of the structural mitigation plan to reviewers, inspectors, and field personnel responsible for installation of construction. All details and sections shall be clearly labeled.

7.

Materials and Specifications. The registered design professional shall identify and provide specifications for all construction materials to be used.

8.

Method of Approval for Changes to Structural Mitigation Plan. The registered design professional shall provide details of steps taken to review, submit, and approve changes.

9.

Special Inspections and Structural Observation Programs. When applicable, the building official may require a P.E., architect, or other qualified person to perform specific special inspections or structural observation programs.

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