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Geotechnical Engineering Evaluation lierracon <br /> Broadway& 10th Starbucks a Everett,WA <br /> January 9, 2014 a Terracon Project No. 81135080 <br /> Borrow" per WSDOT: 9-03.9(1) and 9-03.14, respectively. For combined structural fill and <br /> drainage purposes, a relatively clean and uniform angular material such as "Crushed Surfacing <br /> Base Course" per WSDOT: 9-03.9(3) is preferable. <br /> Fill Placement and Compaction: Structural fill materials should be placed in horizontal lifts not <br /> exceeding about 12 inches in loose thickness. Unless stated otherwise in this report, we <br /> recommend that each lift then be thoroughly compacted with a mechanical compactor to a <br /> uniform density of at least 90 percent, based on the Modified Proctor test (ASTM: D-1557). <br /> Compaction is not necessary for certain structural fill materials, such as pea gravel, drain rock, <br /> quarry spalls, CDF, and LMC. <br /> Subgrade Verification and Compaction Testing: Regardless of material or location, all <br /> structural fill should be placed over firm, unyielding subgrades prepared in accordance with our <br /> various recommendations for site preparation. The condition of all subgrades should be verified <br /> by a Terracon representative before soil or concrete placement begins. Also, fill soil compaction <br /> should be verified by means of in-place density testing, hand-probing, proof-rolling, or other <br /> appropriate methods performed during fill placement so that the adequacy of soil compaction <br /> efforts may be evaluated as earthwork progresses. <br /> 6.0 GENERAL COMMENTS <br /> As discussed above, the site is mantled by fill soils of unknown origin and placement. We <br /> recommend removal of all undocumented fill below new buildings as it is not feasible to <br /> accurately predict the settlement response of such soils. <br /> Terracon should be retained to review the final design plans and specifications so comments <br /> can be made regarding interpretation and implementation of our geotechnical recommendations <br /> in the design and specifications. Terracon also should be retained to provide observation and <br /> testing services during grading, excavation, foundation construction, and other earth-related <br /> construction phases of the project. <br /> The analysis and recommendations presented in this report are based upon the data obtained <br /> from the explorations performed at the indicated locations and from other information discussed <br /> in this report. This report does not reflect variations that may occur between explorations, <br /> across the site, or due to the modifying effects of construction or weather. The nature and <br /> extent of such variations may not become evident until during or after construction. If variations <br /> appear, we should be immediately notified so that further evaluation and supplemental <br /> recommendations can be provided. <br /> The scope of services for this geotechnical project does not include either specifically or by <br /> implication any environmental or biological (such as mold, fungi, and bacteria) assessment of <br /> the site, nor any identification or prevention of pollutants, hazardous materials or conditions. If <br /> Reliable s Responsive s Convenient m Innovative 15 <br />