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City of Anacortes Public Works <br /> Road Right-of-way Testing and Inspection Practice <br /> Utility Trenches: <br /> Compaction Testing <br /> Perform at least 2 compaction tests (ASTM D 2922 nuclear method) per 100 lineal feet <br /> of trench, one at sub-grade level, one at 50%of the trench depth if a hoe-pack is used <br /> for compaction. in addition, test all road crossings at sub-grade and 50%depth. if walk- <br /> behind compaction equipment is used (i.e. jumping jack)test each 12" of depth. <br /> Trench backfill should be compacted to at least 95% of the maximum dry density <br /> according to the modified proctor(ASTM D 1557). Fill should be placed in horizontal lifts <br /> not to exceed 12 inches of loose thickness and follow WSDOT 7-08.3(3) specifications <br /> (2002). <br /> Using a loaded, 10 yard gravel truck, proof roll the trench lines to verify that a firm and <br /> unyielding condition prevails over the entire length of the trenches at the road sub-grade <br /> elevation. <br /> Sieve analysis of backfill material <br /> Sample the imported fill material for sieve analysis prior to trench backfilling at a <br /> minimum interval of one sample per day of operation. <br /> Sample of materials to be used shall be submitted prior to construction to determine <br /> conformance to WSDOT specifications 9-03.12(3)for pipe zone material, 9-03.19 for • <br /> trench backfill and 9-03.9 for Aggregates for Ballast and Crushed Surfacing. <br /> Samples should be taken from material delivered to the site. <br /> Road Sections: <br /> Proof Rolling <br /> Prior to placing structural fill for the road section, testing lab and city engineer <br /> representatives should observe a proof roll of the undisturbed native sub-base using a <br /> loaded dump truck(15 ton minimum certified by load ticket). in areas of significant <br /> pumping and yielding, scarify, aerate and re-compact existing materials (WSDOT 2-06). <br /> if loose native soil conditions prevail, over-excavate the deleterious material to the <br /> satisfaction of testing lab representative and city engineer. After 18"of over-excavation, <br /> place a woven structural geo--textile fabric that is equivalent to or better than a Mirafi <br /> 500x product. Backfill over-excavated areas with clean (<7%fines) structural fill <br /> compacted to 95% of the maximum dry density(ASTM D 1557). <br /> Once the entire road section is placed and prior to paving, testing lab representative <br /> should observe a proof roll of the sub-grade to ensure that there are no yielding or <br /> pumping areas. <br /> Compaction Testing for Road Sections: <br /> Granular and crushed aggregate <br /> Roadbed fill materials should be compacted to 95% of the maximum dry density (ATSM <br /> D 1557) and verified with the nuclear method (ATSM D 2922). <br />