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<br />High Rock Road Waste and Recycling Center Improvements 31 20 00 - 8 <br />Orange County, North Carolina JULY 2021 <br />DAA PN: R00592-213N <br /> <br />B. On prepared subgrade, place subbase and base course under pavements and <br />walks as follows: <br />1. Shape subbase and base course to required crown elevations and cross- <br />slope grades. <br />2. Compact subbase and base course at optimum moisture content to <br />required grades, lines, cross sections, and thickness to not less than 98 <br />percent of maximum dry unit weight according to ASTM D 698. <br />3.15 DRAINAGE COURSE <br />A. Place drainage course on subgrades free of mud, frost, snow, or ice. <br />B. On prepared subgrade, place and compact drainage course under cast -in-place <br />concrete slabs-on-grade as follows: <br />1. Place drainage course that exceeds 6 inches in compacted thickness in <br />layers of equal thickness, with no compacted layer more than 6 inches <br />thick or less than 3 inches thick. <br />2. Compact each layer of drainage course to required cross sections and <br />thicknesses to not less than 95 percent of maximum dry unit weight <br />according to ASTM D 698. <br />3.16 FIELD QUALITY CONTROL <br />A. Testing Agency: Contractor will engage a qualified independent geotechnical <br />engineering testing agency to perform field quality-control testing. <br />B. Allow testing agency to inspect and test subgrades and each fill or backfill layer. <br />Proceed with subsequent earthwork only after test results for previously <br />completed work comply with requirements. <br />C. Testing agency will test compaction of soils in place according to <br />ASTM D 1556, ASTM D 2167, ASTM D 2922, and ASTM D 2937, as <br />applicable. <br />D. When testing agency reports that subgrades, fills, or backfills have not achieved <br />degree of compaction specified, scarify and moisten or aerate, or remove and <br />replace soil to depth required; recompact and retest until specified compaction <br />is obtained. <br />1. 7KH 2ZQHU ZLOO SD\ IRU ³SDVVLQJ´ VRLOV WHVW f <br />FRUUHFWLYHDFWLRQFRVWVRI³IDLOLQJ´VRLOVW <br />the Contractor. <br />DocuSign Envelope ID: BBF56E0A-3618-497E-AA70-92F097E8F598