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<br />Former Lexjngton School <br />STS Project #95192-XF <br /> <br />the number of neutrons detected in a fixed period of time. the greater is the moisture <br />content. <br /> <br />For the sand cone density test method. a sand of known density is used to determine the <br />soil density. A hole approximately 150 mm in diameter by 150 mm deep is made in the <br />vicinity of the soil whose density is to be determined. The soil that is removed is care- <br />fully collected and weighed. The volume of the hole is determined by filling the hole with <br />a known weight of sand. The volume of sand can be determined since the density of the sand <br />is known and the volume of the sand equals the volume of the soil. The density of the soil <br />is the measured weight of the soil removed divided by the volume of the soil removed. <br /> <br />Field density test results for the site are included in the Appendix. The locations at <br />which field density tests were performed are shown on Figure 4. The field density tests <br />performed did confirm adequate compaction of backfill materials after recompaction of the <br />excavation site. <br /> <br />The excavation was topped off with 6 inches of topsoil and sodded to conform to site con- <br />ditions prior to excavation. <br /> <br />- 6 - <br />