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EARTH STRATA GEOTECHNICAL SERVICES 9 March 30, 2023 Project Number 234812-10A The geologist should be present during grading to see temporary slopes. It is imperative that grading schedules minimize the exposure time of the unsupported excavations. All excavations should be stabilized within 30 days of initial excavation. Water should not be allowed to pond on top of the excavations nor to flow toward it. Cut/Fill Transitions Cut/fill transitions should be eliminated from all building areas where the depth of fill placed within the “fill” portion exceeds proposed footing depths. This is to diminish distress to structures resulting from excessive differential settlement. The entire foundation of each structure should be founded on a uniform bearing material. This should be accomplished by overexcavating the “cut” portion and replacing the excavated materials as properly compacted fill. Refer to the following table for recommended depths of overexcavation. DEPTH OF FILL (“fill” portion) DEPTH OF OVEREXCAVATION (“cut” portion) Overexcavation of the “cut” portion should extend beyond the building perimeter a horizontal distance equal to the depth of overexcavation or a minimum of 5 feet, whichever is greater. Cut Areas In cut areas, an area a minimum of 5 feet beyond the footprint of the proposed structures should overexcavated until; competent bottoms are achieved; to a minimum 3 feet below the proposed foundations; or per the Overexcavation Table above; (whichever is greater) and replaced with compacted fill. Final determination of areas that require overexcavation should be determined in the field by a representative of Earth Strata Geotechnical Services. Shrinkage, Bulking and Subsidence Volumetric changes in earth material quantities will occur when poorly consolidated earth materials are replaced with properly compacted fill. Estimates of the percent shrinkage/bulking factors for the various geologic units observed on the subject property are based on in-place densities and on the estimated average percent of relative compaction achieved during grading. GEOLOGIC UNIT SHRINKAGE (%) Subsidence from scarification and recompaction of exposed bottom surfaces is expected to be negligible to approximately 0.01 foot. 2130 E 4th St 2/11/2025