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9/2/2020 <br /> <br />31 20 00 EARTH MOVING Page 12 of 13 <br />2. Place drainage course 6 inchesor less in compacted thickness in a single layer. <br />3. Place drainage course that exceeds 6 inchesin compacted thickness in layers of equal <br />thickness, with no compacted layer more than 6 inchesthick or less than 3 inchesthick. <br />4. Compact each layer of drainage course to required cross sections and thicknesses to not <br />less than 95 percent of maximum dry unit weight according to ASTM D 698. <br />3.20 TOPSOIL <br />A. Re-spread stockpiled topsoil in all planting areas. Distribute all stockpiled material in a uniform <br />thickness as follows: <br />1. Lawn Area: 4 inch minimum <br />2. Planting Area: 12 inch minimum <br />3. Adjust topsoil as required by Engineer following topsoil depth testing by Owner's testing <br />representative. <br />3.21 FIELD QUALITY CONTROL <br />A. Special Inspections: Owner will engage a qualified special inspector to perform the following <br />special inspections: <br />1. Determine prior to placement of fill that site has been prepared in compliance with <br />requirements. <br />2. Determine that fill material classification and maximum lift thickness comply with <br />requirements. <br />3. Determine, during placement and compaction, that in-place density of compacted fill <br />complies with requirements. <br />B. Testing Agency: Owner will engage a qualified geotechnical engineering testing agency to <br />perform tests and inspections. <br />C. Allow testing agency to inspect and test subgrades and each fill or backfill layer. Proceed with <br />subsequent earth moving only after test results for previously completed work comply with <br />requirements. <br />D. Footing Subgrade: At footing subgrades, at least one test of each soil stratum will be performed <br />to verify design bearing capacities. Subsequent verification and approval of other footing <br />subgrades may be based on a visual comparison of subgrade with tested subgrade when approved <br />by Geotechnical Engineer. <br />E. Sub-grade proof-roll tests will be performed on all sub-grades beneath building pads and <br />pavements. <br />F. Testing agency will test compaction of soils in place according to ASTM D 1556, ASTM D 2167, <br />ASTM D 2937, and ASTM D 6938, as applicable. Tests will be performed at the following <br />locations and frequencies: <br />DocuSign Envelope ID: 7D9ACD4F-8F6C-42B6-9ADB-C60032DB6D03