1803.6.1 Information required in geotechnical reports.

The geotechnical report shall be prepared by the engineer responsible for the geotechnical investigation and shall be signed and sealed. The geotechnical report submitted to the commissioner shall include the foundation system shown on the drawings submitted to the department. The report shall include, but need not be limited to, the following information:

   1.   A description of the planned structure.

   2.   A plot showing the location of test borings, excavations, probes, and/or other exploration techniques.

   3.   A complete record of the soil and/or rock sample descriptions.

   4.   A record of the soil and/or rock profile.

   5.   Elevation of the groundwater table (if encountered), base flood elevation (if applicable), and design flood elevation.

   6.   Results of in-situ or geophysical testing.

   7.   Results of laboratory testing.

   8.   Recommendations for foundation type and design criteria, including but not limited to allowable bearing capacity of natural or compacted soil and/or rock; soil stiffness parameters required for design of the foundations; mitigation of the effects of liquefaction (if applicable); site class; Mapped MCE R spectral acceleration parameters (S S and S 1 ); design spectral response acceleration parameters (S DS and S D1 ); site adjusted peak ground acceleration (PGA M ); differential settlement and varying soil and/or rock strength; and the effects of adjacent loads.

   9.   Design lateral earth pressures on foundation walls and other retaining walls.

   10.   Recommendations for the evaluation of adjacent properties potentially impacted by the proposed construction.

   11.   Where dewatering is required, recommendations for the maximum permissible drawdown outside the site.

   12.   Expected total and differential settlement.

   13.   Special design and construction provisions for footings or foundations founded on expansive soils, as necessary.

   14.   Compacted fill material properties and testing in accordance with Section 1804.6.

   15.   Controlled low-strength material properties and testing in accordance with Section 1804.7.

   16.   A list of anticipated special inspections required for construction of earthwork and foundations.

   17.   For deep foundations reports, the requirements outlined in Section 1810.2.2.

   18.   For permanent prestressed rock and soil anchor reports, the requirements outlined in Section 1815.2.

   19.   Soil and rock parameters to be used to determine the safe slope of temporary excavations pursuant to Section 3304.4.1.

1803.7 Construction documents.

Construction documents shall be prepared in accordance with Section 107.7.1.

(Am. L.L. 2023/077, 6/11/2023, eff. 6/11/2023)

Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2023/077.

Section BC 1804: Excavation, Grading and Fill

1804.1 Excavations near foundations.

Excavations for any purpose shall not reduce vertical or lateral support for any foundation without first evaluating if underpinning or protecting the foundation against detrimental lateral or vertical movement, or both, is required. Where required, underpinning or shoring shall be provided in accordance with Section 1817.

1804.2 Placement of backfill.

The excavation outside the foundation shall be backfilled with soil that is free of organic material, construction debris, or boulders. A controlled low-strength material (CLSM) can be used as backfill in lieu of soil. Soil backfill shall be placed in lifts and compacted in a manner that does not damage the foundation or the waterproofing or dampproofing material.

   Exception: Controlled low-strength material need not be compacted.