ML19312E126

Revised Pages B-3 & B-15 to 1979 Annual Environ Operating Rept. Typographical Errors Corrected

ML19312E126
Person / Time
Site:	Davis Besse
Issue date:	05/27/1980
From:	TOLEDO EDISON CO.
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ML19312E124	List: ML19312E123 ML19312E126
References
NUDOCS 8006030313
Download: ML19312E126 (2)

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O s-3 and its dispersal :nrougn the year. Organic matter levels coincice with CEC values in the Peninsula soils, and organic matter is the major contributor to these CEC values.

The pH values remained in the neutral to slightly alkaline range for the peninsula soils, as in previous years. The tendency for the pH levelt to increase in the fall and winter seasons, especially in the Hackberry-Box Elder and Hackberry II conraunities, was attributed to the l

litter fall and the accompanying release of bases into the soil profile.

The levels cf sulfates (ppm) remained very low in the Peninsula area in 1979. However, in comparison to 1978, the levels are increasing in 1

each of the three sites and at each depth sampled. (During 1979, there was an increase in sulfates from the surser to the fall, but the changes did not occur in any particular pattern.) The largest cnanges were at the 10 cm depth in the Sumac / Hackberry / Box Elder coninunity; but such increases did not influence soil pH or base saturation, as they have in other loca-ti ons . The changes in sulfate , levels appear cyclical; the levels declined from 1977 to 1978 and increased again to 1979. Moisture in the fem of natural precipitation likely is responsible for these changes.

One other factor which may contribute to the high CEC values in the Hackberry II cocinunity is nitrates (NO3 -). Nitrate levels were very high in sumer (173 ppm but were greatly reduced by fall (13 ppm). The ni-trates are highly soluble and would be readily lost to percolating water and in surface runoff when the soil reaches field capacity. The concen-tration of nitrates near the surface, associated with the organic matter and tne accompanying fungi and bacteria, would provide a temporary source s

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B-15

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. The soil cooled somewhat more slowly in the Tower Woods than ir the Peninsula area during fall 1979, reaching a level below 40*

during the week of November 23, compared to the week of Ncvember 9.

The cooling was one week later than the Tower Woods in the previcas year. The soil froze at the 10 cm depth during the week of December 14, two weeks later than the Peninsula area in 1979 and the Tower Woods in 1978. The maximum range of soil temperatures at 10 cm occurred later than in 1977 and 1978, mid-April to mid-May com-pared to early March to early April (1978) and mid-March to early May (1977). However, the ranges in 1979 exhibited the same spring double peak in 1979 as in 1978. During the summer and fall 1979, temperature ranges at 10 cm were generally lower than in 1978.

The average soil temperatures at 20 cm varied in a pattern similar to the 10 cm depth, except during the winter 1979. The soil at the 20 cm depth did not freeze until the week of February 9, when the low level was reached. The temperatures during winter 1979 aver-aged about 8 to 10 degrees higher than the winter of 1978. The temp-erature reached 40* during the week of April 20, the same as at the 10 cm depth in the Tower Woods and one week later than the Peninsula area. The temperature remained cooler than at the 10 cm depth from the week of April 20 to the end of August. The peak temperature, reached during the week of August 10, was 4.5 degrees cooler than at the 20 cm depth in 1978. The temperature at 20 cm decreased to below 40* during the week of November 9, one week before 1978, but did not reach the freezing point until the week of December 28, com-pared to the first week of December 1978. The ranges of temperatures

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