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