6617 ASSOCIATED BLVD AMAZON Geotech Report 2022-10-25

• • Bright People.ItightSokrtfors. • KLEINFELOER • 4.5 EARTHWORK • 4.5.1 General • • Site preparation and earthwork operations should be performed in accordance with applicable • codes, safety regulations and other local, state or federal specifications, and the I• recommendations included in this report. References to maximum dry unit weights are • established in accordance with the latest version of ASTM Standard Test Method D1557 • (Modified Proctor). The earthwork operations should be observed and tested by a • representative of Kleinfelder. • • 4.5.2 Site Preparation • • Pavement, planters, abandoned utilities, foundations, and other existing infrastructure within proposed improvement areas should be removed and the excavation(s) backfilled with • engineered fill. Debris produced by demolition operations, including wood, steel, piping, plastics, • etc., should be separated and disposed of off-site. Existing utility pipelines or conduits that • extend beyond the limits of the proposed construction and are to be abandoned in place should • be plugged with non-shrinking cement grout to prevent migration of soil and/or water. • Demolition, disposal and grading operations should be observed and tested by a representative • of the geotechnical engineer. Areas to receive fill should be stripped of all dry, loose or soft • earth materials and undocumented fill materials to the satisfaction of the geotechnical engineer. • • • Pavements, Sidewalks and Other Flatwork Areas in Developed Areas: After the area • has been stripped of soft earth materials and debris, we recommend that the exposed • subgrade be proof-rolled with heavy construction equipment (e.g. loader or smooth-drum roller) to disclose areas of soft and yielding material. Where soft and yielding material is 4P observed, it should be overexcavated and replaced as structural fill. After proof-rolling • and/or prior to placement of fill, the subgrade should be scarified to a depth of 6 to • 8 inches, moisture conditioned, and compacted to at least 95 percent of the maximum • dry unit weight. The proof-rolling should extend beyond the proposed improvements a horizontal distance of at least 2 feet. • • • Pavements, Sidewalks and Other Flatwork Areas in Current Undeveloped Areas: After • the area has been stripped of vegetation, soft earth materials, and debris, we • recommend that the existing soils be overexcavated to a depth of at least 18 inches • • 20203884.001A/SEA20R110164 Page 18 of 28 June 1, 2020 ©2020 Kleinfelder • •