The particle-size distribution of sand was below 99 percent in experimental 

 samples from September, October, and November 1976, and from January, June, 

 July, August, and September 1977. The lowest level (92 percent) was recorded 

 in September 1976. Other low values were only in the 97- to 98-percent range. 

 Granule-size particles were consistently under 1 percent, but 11 experimental 

 samples contained more than 0.30-percent silt-clay. The highest value for the 

 silt-clay fraction was 8.1 percent in a sample collected on 21 September 1976. 

 Values of more than 1-percent silt-clay were also recorded in another September 

 sample as well as in October and November 1976, and again in January, June, July, 

 August, and September 1977. 



Mean grain size for experimental samples did not range below fine sand. 

 Sorting categories changed for two experimental samples. In the September 1976 

 sample, sorting was only moderate; in the May 1977 sample, it proved to be 

 extremely poor. For skewness, five experimental samples exhibited an 

 uncharacteristic trend that placed them in classifications of fine skewed to 

 strongly fine skewed. The single sample classified as strongly fine skewed was 

 obtained in September 1976; the others were collected in September and October 

 1976, and August and September 1977. Deviation from the normal leptokurtic 

 condition was recorded for five experimental samples. Values corresponding to 

 mesokurtic were recorded in August 1976, and April and May 1977. Values in the 

 very leptokurtic range were recorded in January and June 1977. 



A carbon content percentage greater than the base-line average was recorded 

 in 12 experimental samples; however, this number of samples may be low since no 

 carbon analyses were made after the June 1977 sampling. The highest recorded 

 value was 2.32 percent for the September 1976 sample. Other slightly elevated 

 values ranged between 0.31 and 1.21 percent. Among these 12 samples, the pro- 

 portion of organic carbon to carbonate carbon was higher for carbonate in 6 

 samples, higher for organic in 5, and in 1, the ratio was nearly even. 



Sediment data for control and experimental samples collected at the six 

 stations in July 1977 has been tabulated for comparison (Table 2). These 

 analyses include only textural and statistical properties; no information on 

 carbon chemistry was available. 



At the six stations, granule-size particles were present in only four 

 samples, and three of these came from borrow pits at stations 3, 4, and 6. The 

 single control sample containing granules also came from station 6, and the 

 overall granule distribution was under 1 percent. Sand content was about 99 

 percent in all collections. For the silt-clay fraction, only one value was 

 considered abnormally high and that was recorded for the experimental sample 

 from station 1 (1.36 percent). 



With the one exception of medium sand (station 3, experimental), all samples 

 fell into the classification of fine sand. Calculations for sorting showed that 

 9 of 12 samples were well to moderately well sorted. Other classifications 

 included moderately sorted (station 4, experimental and station 6, control) and 



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