Unless the applicant has submitted an engineering analysis, prepared in accordance with standard engineering practice by a registered design professional, that demonstrates the proposed work will not result in any increase in the level of the base flood, grading, excavation and earthwork construction, including fills and embankments, shall not be permitted in floodways that are in flood hazard areas established in Section 1612.3 or in flood hazard areas where design flood elevations are specified but floodways have not been designated.
The following words and terms shall, for the purposes of this appendix, have the meanings shown herein. Refer to Chapter 2 of this code for general definitions.
CUT. See "Excavation."
EROSION. The wearing away of the ground surface as a result of the movement of wind, water or ice.
EXCAVATION. The removal of earth material by artificial means, also referred to as a cut.
FILL. Deposition of earth materials by artificial means.
GRADE. The vertical location of the ground surface.
SLOPE. An inclined surface, the inclination of which is expressed as a ratio of horizontal distance to vertical distance.
- Grading in an isolated, self-contained area, provided that the public is not endangered and that such grading will not adversely affect adjoining properties.
- Excavation for construction of a structure permitted under this code.
- Cemetery graves.
- Refuse disposal sites controlled by other regulations.
- Excavations for wells, or trenches for utilities.
- Mining, quarrying, excavating, processing or stockpiling rock, sand, gravel, aggregate or clay controlled by other regulations, provided that such operations do not affect the lateral support of, or significantly increase stresses in, soil on adjoining properties.
- Exploratory excavations performed under the direction of a registered design professional.
Exemption from the permit requirements of this appendix shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction.
- Structures, additions, or remodels with a footprint less than 600 square feet.
- Decks, shade structures, and patio covers accessory to a one or two family dwelling.
- Mobile homes, trailers, and modular buildings that are not considered real property.
- Signs, light poles, and communication towers
- General vicinity of the proposed site.
- Property limits and accurate contours of existing ground and details of terrain and area drainage.
- Limiting dimensions, elevations or finish contours to be achieved by the grading, proposed drainage channels and related construction.
- Location of any buildings or structures on the property where the work is to be performed and the location of any buildings or structures on land of adjacent owners that are within 100 feet of the property or that may be affected by the proposed grading operations.
- Recommendations included in the geotechnical report shall be incorporated in the grading plans or specifications as follows:
- Locations and dimensions of all cut and fill slopes,
- Locations of all cross sections presented in the geotechnical report,
- Locations and sizes of all recommended remedial measures such as buttress fills, stability fills, deep foundation systems, reinforced earth, retaining walls, etc.,
- Location and layout of proposed subdrainage system.
- A statement that the site shall be graded in accordance with the approved geotechnical report. This statement shall include the firm name that prepared the geotechnical report, the report number, and the date of the geotechnical report.
- Locations of other existing topographic features either natural or man-made such as streets, drainage structures, pavements, walls, mining pits, etc.
- The cut to fill transition line.
- Positive drainage away from the foundation per Section 1804.3.
- Details and cross sections at property lines, fence walls, retaining walls, berms, etc.
- Elevation datum and benchmarks (NAVD 88).
- Existing contours at least 100 feet beyond the property lines.
- Proposed finish contours or spot elevations at the property corners, building pad, and at swale flow lines.
- Elevations of curbs or centerlines of roads or streets.
- Earthwork quantities in cubic yards.
- Finish floor elevations.
- Details and cross sections of typical fill slopes and cut slopes.
- Typical details of fill-over-natural slopes and fill-over-cut slopes where fill is to be placed on natural or cut slopes steeper than 5H:1V in accordance with Section J107.
- Setback dimensions of cut and fill slopes from site boundaries per Section J108.
- The placement of buildings and structures on and or adjacent to slopes steeper than 3H:1V (33.3% slope) shall be in accordance with Section 1808.7.
- Provide terracing in accordance with Section J109 for slopes steeper than 3H:1V (33.3% slope).
- Provide the locations and dimensions of all terrace drains for all slopes steeper than 3H:1V in accordance with Section J109.
- The standard notes specified in the Las Vegas Valley Construction Site Best Management Practice Guidance Manual (most current edition).
- Registered design professional original seal (wet seal), signature and date or a Records stamp and signature stating, "This is a true and exact copy of the original document on file in this office."
For sites with mapped maximum considered earthquake spectral response accelerations at short periods (Ss) greater than 0.5g as determined by Section 1613, a study of the liquefaction potential of the site shall be provided and the recommendations incorporated in the plans.
Upon completion of pad grading (or foundation excavation) and prior to a footing or foundation inspection, a Final Grading report shall be provided by an approved agency. Grading (or foundation excavation) shall be observed and tested by an approved agency. The approved agency shall prepare the report, signed by a registered design professional certifying that the grading and earthwork are complete and substantially comply with the requirements of the geotechnical report of record including any approved supplements or addenda. At the option of the building official, a Pad Certification report submitted in accordance with Section J105.1.3 may be accepted as an interim report prior to a footing or foundation inspection. A Final Grading report will then be required prior to receiving a Final Inspection.
The final grading report shall state that the engineer for grading inspections is certifying that all grading recommendations in the approved geotechnical report (including any approved updates or addenda) have been followed. Noncompliance reports shall be written when the grading contractor did not follow the recommendations of the approved report or when site conditions did not match those indicated in the approved geotechnical report. The engineer for grading inspections shall not authorize any revisions to the approved geotechnical report without the written consent of the geotechnical engineer of record.
The Final Grading report itself will contain all applicable test data and analysis of the data. Specific project information is also required if there were any changes to the geotechnical report of record or unusual circumstances encountered during grading. The report shall also include the following information:
- Compaction test results, requirements, locations, depth of backfill at test locations and names of technicians conducting the tests.
- Moisture Density values and curves that include classifications for all soils used in the grading operation.
- Description of structure or pad including the proposed use.
- Grading plan showing approximate locations of tests, dates and depths of over-excavation observations, original contours and finish pad elevations.
- Swell and solubility test requirements and results. This information shall be provided if required by the geotechnical report of record, elsewhere in the code, or if imported soils were utilized.
- Type of foundation system applicable to work being certified (i.e. spread footings, strip footings, combination footings, drilled shafts etc.).
- Import material used, source of import, and tests indicating compliance with the geotechnical report of record recommendations
- Classification of Sulfate Exposure for foundation soils in relation to ACI 318-14 Section 19.3.2.
- All daily reports, test data, non-compliance reports, and records of corrections.
- A statement describing the process of pad grading. Where applicable, this shall include, but not be limited to the minimum depth of over-excavation, blending operations, the use of import soils, nested aggregate, organics encountered, and removal of unsuitable soils.
- The preceding requirements shall be presented for each pad or structure being certified.
The final grading report shall state that the engineer for grading inspections is certifying that all grading recommendations in the approved geotechnical report (including any approved updates or addenda) have been followed. Noncompliance reports shall be written when the grading contractor did not follow the recommendations of the approved report or when site conditions did not match those indicated in the approved geotechnical report. The engineer for grading inspections shall not authorize any revisions to the approved geotechnical report without the written consent of the geotechnical engineer of record. The Final Grading report remains valid for a maximum of six months after the completion of grading. The six month period begins at the first test date of the final test of the final lift of the structural pad. Once expired, a Pad Recertification report is required.
This letter/report is used as an interim document until a Final Grading report is completed (i.e., a Final Grading report for the entire project or a particular phase(s) of a project). The approved agency shall prepare this report signed by a registered design professional and certifying that the grading and earthwork are complete and substantially comply with the requirements of the geotechnical report of record including any approved supplements or addenda. Specific project information is also required if there were any changes to the geotechnical report of record or unusual circumstances encountered during grading.
This report shall include the following information for each pad or structure:
- The first test date of the final test of the final lift.
- Permit number and pad or structure description.
- Classification of Sulfate Exposure for foundation soils in relation to ACI 318-14 Section 19.3.2.
- Classification of foundation soil for expansive properties (i.e. non-expansive or results from standard 60 pounds per square foot swell test).
- The name(s) of the approved special inspector(s) and any technicians that observed grading or foundation improvements.
This report remains valid for no longer than six months after the completion of grading. The six month period begins at the first test date of the final test of the final lift of the structural pad. Upon expiration, a Final Grading report and Pad Recertification report will be required.
This report is required when a Final Grading report or Pad Certification report has expired or if required by the building official. The approved agency shall prepare this report signed by a registered design professional certifying the current suitability of the pad(s). The condition of the pad(s) is discussed, tests performed and their results are presented and discussed, and any additional grading or reworking is discussed. The conclusions are stated and based upon the current condition of the pad(s) compared to completion at original grading and a statement that the current condition of the pad(s) substantially complies with the requirements of the geotechnical report of record including any approved supplements or addenda.
As a minimum, pad moisture data and standard sixty pounds per square foot swell test results, if applicable, are included in this report. The tests shall be conducted on a representative number of pads.
The report remains valid for no longer than six months after the latest test date. Once expired, the pad(s) recertification will require an evaluation by a registered design professional to confirm the applicability of current site conditions.
Upon completion of final grading, and prior to the final building inspection, a statement of compliance for drainage shall be provided by the registered design professional in responsible charge or the developer when approved by the building official.
When engineered drainage features, facilities, or structures are required by the approved plans, the registered design professional in responsible charge shall verify that installed and constructed elements are in compliance with the approved plans. This includes site detention, lot to lot drainage, and drainage conveyance devices.
The slope of cut surfaces shall be not steeper than is safe for the intended use, and shall be not more than one unit vertical in two units horizontal (50-percent slope) unless the owner or the owner's authorized agent furnishes a geotechnical report justifying a steeper slope.
- A cut surface in bedrock shall be permitted to be at a slope of one unit horizontal to one unit vertical (100-percent slope).
Where existing grade is at a slope steeper than one unit vertical in five units horizontal (20-percent slope) and the depth of the fill exceeds 5 feet (1524 mm) benching shall be provided in accordance with Figure J107.3. A key shall be provided that is not less than 10 feet (3048 mm) in width and 2 feet (610 mm) in depth.
Where required to protect adjacent properties at the toe of a slope from adverse effects of the grading, additional protection, approved by the building official, shall be included. Examples of such protection include but are not be limited to:
Terraces not less than 6 feet (1829 mm) in width shall be established at not more than 30-foot (9144 mm) vertical intervals on all cut or fill slopes to control surface drainage and debris. Suitable access shall be provided to allow for cleaning and maintenance.
Swales or ditches shall be provided on terraces. They shall have a minimum gradient of one unit vertical in 20 units horizontal (5-percent slope) and shall be paved with concrete not less than 3 inches (76 mm) in thickness, or with other materials suitable to the application. They shall have a depth not less than 12 inches (305 mm) and a width not less than 5 feet (1524 mm).