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SIGNET STL Project No. 00 10771 <br /> 7�strng Labs Page 12 <br /> PORTLAND CEMENT PAVEMENT <br /> HEAVY DUTY <br /> Traffic Portland Class If Compacted <br /> 111(lux Cement Concrete*** X�,­re­atc Base, St b"Iratle-1. <br /> 7.0 6.5" 1 6.0" 12.0" <br /> 95% compaction based on ASTMD1557 or CAL 216 <br /> '• 90% compaction based on ASTM D1557 or CAL 216 <br /> '**Minimum compressive strength of 3000 psi <br /> Compacted Material Acceptance <br /> Compaction specifications are not the only criteria for acceptance of the site grading or other such <br /> activities. The compaction test is the most universally recognized test method for assessing the <br /> performance of the Grading Contractor. However, the numerical test results from the compaction test <br /> cannot be used to predict the engineering performance of the compacted material. Therefore, the <br /> acceptance of compacted materials will also be dependent on the stability of that material. The Soils <br /> Engineer has the option of rejecting any compacted material regardless of the degree of compaction if <br /> that material is considered to be unstable or if future instability is suspected. A specific example of <br /> rejection of fill material passing the required percent compaction is a fill which has been compacted <br /> ` with an in-situ moisture content significantly less than optimum moisture. This type of dry fill (brittle <br /> fill) is susceptible to future settlement if it becomes saturated or flooded. <br /> Testing and Inspection <br /> A representative of Signet Testing Labs, Inc. should be present at the site during the earthwork <br /> activities to confirm that actual subsurface conditions are consistent with the exploratory fieldwork. <br /> This activity is an integral part of our services as acceptance of earthwork construction is dependent <br /> upon compaction testing and stability of the material. This representative can also verify that the intent <br /> of these recommendations is incorporated into the project design and construction. Signet Testing <br /> Labs, Inc. will not be responsible for grades or staking, since this is the responsibility of the Prime <br /> _ Contractor. <br /> LINIITATIONS <br /> Soils Engineering is one of the newest divisions of Civil Engineering. This branch of Civil <br /> Engineering is constantly improving as new technologies and understanding of earth sciences improve. <br /> Although your site was analyzed using the most appropriate current techniques and methods, <br /> undoubtedly there will be substantial future improvements in this branch of engineering. In addition to <br /> improvements in the field of Soils Engineering, physical changes in the site either due to excavation or <br /> fill placement, new agency regulations or possible changes in the proposed structure after the time of <br /> completion of the soils report may require the soils report to be professionally reviewed. In light of <br /> r. <br /> 1417 No. Market Blvd., Suite 1 . Sacramento,CA 95834 . (916)568-5858 . Fax: (916)568-5813 <br />