Table 2-1 



SUPERTANK Sediment Mineralogic Composition 



Composition by Weight 



Light minerals (SG 1 < 2.87) 



94.9 percent 



Heavy minerals (SG > 2.87) 



5.1 percent 



Composition of Light Fraction 



Quartz 



64.2 percent 



Feldspar 



35.8 percent 



Composition of Heavy Fraction 



Leucoxene 



68.1 percent 



Hornblende 



18.2 percent 



Tourmaline 



4.4 percent 



Other 



9.3 percent 



Note: SG denotes specific gravity; analysis performed by Mr. Edward P 

 formerly Research Physical Scientist (Geology), CERC. 



Meisburger, 



Table 2-2 summarizes grain-size statistics of the same sample as deter- 

 mined by sonic sifter analysis. The sediment consisted primarily of very 

 uniform fine sand with median grain-size diameter of 0.22 mm. 



Table 2-2 



SUPERTANK Sediment Content and Grain-Size Statistics 



Sample Content by Weight, percent 



Classifi- 

 cation 



Gravel 



Coarse 

 Sand 



Medium 

 Sand 



Fine 

 Sand 



Silt 



Clay 



Went- 

 worth 



0.034 



0.197 



14.487 



85.255 



0.027 



0.000 



Unified 



0.000 



0.034 



0.244 



99.668 



0.054 



0.000 



Grain-Size Statistics 



Analysis 

 Method 



Median 



Mean 



Std. Dev. 



Skew. 



Kurt. 



Moment, 

 phi 



-- 



2.23 



0.28 



-1.68 



32.49 



Folk 



Graphic, 



phi 



2.21 



2.22 



0.24 



0.12 



1.08 



Diameter, 

 mm 



0.22 



0.21 







- 



Chapter 2 Beach Profile Surveys and Sediment Sampling 



51 



