ML19329E153
| ML19329E153 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 11/24/1967 |
| From: | ARKANSAS POWER & LIGHT CO. |
| To: | |
| References | |
| NUDOCS 8005300755 | |
| Download: ML19329E153 (7) | |
Text
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TABLE OF APPEliDICES Appendix
. Tab 1A 1A TECICTICAL QUALIFICATIONS Tab 2A 2A ETEOROLOGY Tab 23 23 SURFACE WATER HYDROLOGY Tab 2C 2C GROUND WATER HYDROLOGY.
Tab 2D 2D GEOLOGY.
Tab 2E 2E SEISMCLOGY.
Tab 2F 2F DARDANELLE DA:'
Tab 2G 6
2G STABILITY OF SOIL SLOPES 5A STRUCTURES DESIGN EASES Tab 5A 5B COIITAIIBEIiT FROOF TESTS Tab 5B SC SPLICIN3 REniFORCING EAR Tab 5C 5D LOAD FACTORS AIID LOAD COMBINATIONS.
Tab 5D 5E YIELD REDUCTION FACTORS Tab 5E 5F CC.ILIAUBE:iT STRUCTURAL ANALYSIS.
Tab 5F 5G FIELD WELDING PROCEDURE Tab 5G 5H CONTAIIBI:iT INSTRUMENTATION Tab 5H J
PCST-IE:ISIONIIIG Tab J l5 SK PRESTRESSHIG TENDONS Tab 5K l7 C
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APPENDIX 2C_
GROUND WATER IIYDROLOGY GROUND WATER IIYDROLOGY_
2.C 2.C 1 GEMERAL GEOLOGY GROU'iD WATER MOVEMENT _
2.C.2 2.C.3 CROUND WATER SUPPLY 2.C.4 WATER QUALITY MIGRATION OF RADIOACTIVE IONS 2.C.5 f
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2.C GROU'iD WATER HYDROLOGY 2.C.1 GENERAL CE0 LOGY The site is located in an area where clay and silty clay deposits overlie bedrock which cenuists of Pennsylvanian McAlester formation shale.
The thickness of this clayey overburden varies from about 13 to 23 feet in the vicinity of the site.
The bedrock sequence forms the trough of the east-west trending Scranton syncline. Hard, fine grained sandstone of the Hartshorne formation was encountered during drilling at a depth of about 150 feet.
2.C.2 GROUND WATER MOVEMENT The piezometric surface slopes about 24 feet per mile southwest toward the lake as shown on Plate 2C2.
Domestic wells located down ground water slope f rcm the plant site extend into bedrock, therefore, any contaminated water accidentally spilled at the plant will migrate slowly through rela-tively impermeable clay toward the lake and have no affect on water supplies from the artesian bedrock aquifer. The estimated rate of migration through the overburden is 0.1 to 1 foot per year.
2.C.3 GROUND WATER SUPPLY The only use of ground water in the vicinity of the site is for local domestic purposes.
Good ground water bearing zones are not present in the overburden material at or near the site.
Limited supplies are pumped from joint systems-in the shale and sandstone bedrock aquifers.
Bost wells drilled into these 'edrock artesian water producing zones are less than c
150 feet in depth. These wells are capable of only relatively low yields and a " good" well may produce up to 50 gpm.
Shallow domestic wells in the general vicinity are located up ground water slope fram the plant site; therefore contnmination from the plant is not possible. D2eper wells are not subject to contnnhation from the plant due to the presence of an impervious cap over the artesian aquifer. This aquielude, or impervious cap is the upper portion of the shale zone which acts as a confining media preventing the upward flow of the confined uater. This same impervious material vould prevent the downward percolation of any surface water from the plant area.
Piezometers bottomed in the overburden at the plant site were dry five days after installation, but a nearby piezometer drilled into bedrock encoun-tered confined water which roce to within 9.5 feet of the ground surface.
As shown on Plate 2D4, a profile of the piezometric surface indicates that the recently filled Dardanelle Reservoir and the pre-reservoir water table have not reached equilibrium. This is apparently due to the low permeability of the soil cover over the bedrock.
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2.C.4 WATER QUAllTY Ten samples of ground water and, two samples from Dardanelle Reservoir and one of Arkansas River water from downstream of the dam (located about nine mines southeast of the site) were sent to a laboratory for chemical analysis.
Refer to Plate 2Cl for ground water sample location and to Table 1 which summarizes the results of the chemical analyses.
Portions of the above mentioned surface water samples were sent to Tracerlab in Richmond, California for gross beta analyses. These tests yielded values varying from 18.0 to 27.9 pico (micro micro) curies per liter indicating normal surface water background radioactivity.
The quality of the river and reservoir water is generally chemically superior to about 50% of the ground water samples.
These surface water samples had pH values of 7.4 and average total dissolved solids of 432 ppm (parts per million).
The ground water from the sampled wells, all from the bedrock artesian system, varies from acidic to alkaline; from a high bicarbonate content of 444 ppm to a low of 5 ppm, and from a high of 1559 ppm total dissolved solids to a low of 34 ppm. Total hardness ranges between 4 and 830 ppm.
Due to the wide range of quality of ground water from the artesian aquifer, if ground water development for potable use is considered careful well site selection is required.
Treatment of water to reduce mineral content from some wells sampled would be required to obtain water which is within U.S.
Department of Health water quality standards. A preliminary evaluation of the quality of the sampled wells indicates that a zone (Zone A) extending between water wells No. 6 and 3, north and east of the plant site, pro-duces the best quality water. The average total dissolved solids of the samples from this zone is 245 ppm (excluding the low 34 ppm analysis).
However, two wells within this zone have some undesirable constituents.
Well No. 2 has an iron (Fe) content of 1.3 ppm which is slightly above the recommended maximum of 0.3 ppm. Wells No. 4 and 5 have manganese (Mn) con-tents of 0.3 and 4.0 ppm which are above the recommended drinking water maximum of 0.05 ppm.
Also it should be noted that wells No. 8 and 9, located in Zone B about 2500 feet west of the site area, are undesirable either due to nitrate (NO ) e ntent r due t am unt t ta issolved 3
solids.
The two sample wells in the vicinity of the site (No. 1 and 7) produce alkaline bicarbonate water with total dissolved solids of 773 and 635, respectively, as compared with the recommended maximum of 500 ppm.
In all other respects this water is chemically satisfactory for human consumption.
Thus, the samples indicate that potable water of suitable quality can be obtained from the vicinity of the site or from Zone A located about 3000 feet north and east from the site area.
The cost of piping the low quantity required for potable water from Zone A would be low, thus the primary consideration for a ground water supply is the comparison of the total dissolved solids of 245 ppm (Zone A) vjt 700 ppm (near site).
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The exact depth of production of the better quality wells is not known,
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-however, the field study indicated that.the wells should be about 150 feet in depth.
The previous discussion has considered only the quality of the water.
It should be noted that the field study indicated that the domestic wells in the area are capable of only low productivity.
2.C.5 MIGRATION OF RADI0 ACTIVE IONS As has been previously stated, the thick clayey cover over the bedrock precludes contamination of the bedrock ground water system. The possi-bility of contamination of the ground surface and migration of contaminant to the lake is very remote because of the extremely low permeability of the clayey overburden at the site and the affinity of the radionuclides in solution for this clay. These factors should negate any significant or long distance travel of contaminated water.
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TABLE I CHEMICAL ANALYSIS OF GROUND F AM (parts per mill 1104 Scmple Number
- pH NO C1 S0 HCO C0 Na K
3 g
3 3
1 8.8 3
206 12 444 10 308 03.5 2
6.2 13 52 22 34 0
30 22.5 3
8.4 1.5 90 41 134 2
48 77.3 4
5.7 2.6 10 4
5 0
5 0 0.75 5
8.5 1.5 36 11 163 2
27 03.45 6
7.0
< 0.1 41 6
183 0
40 0~.75 7
8.7 2.3 125 5
417 24 261 0a.25 8
8.4 3.8 116 687 293 17 150 2
9 6.8 210 196 178 107 0
216 3..
1 10 8.4 2.5 28 182 280 6
100 1.
1 11 (Reservoir) 7.4 2.5 160 62 107 0
103 3.:.9 12 (Reservoir) 7.4 2.4 144 56 100 0
94 3.. 6 13 (D/S Dam) 7.4 4.5 141 58 100 0
91 3.:.9
- Rafer to Plate 2 for location of sample.
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T I RIVER WATER O
Total Cn Mg Alk.
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3 388 24 773 9
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<3.1 1.1 8
10 28 60 197 26 1.3
<1.1 0
28 24 116 168 332 13
<0.1
<0.1 0.22 1.6 1.5 4
10 34 19
<0.1 0.3 0
33 14 140 140 218 27
<0.1 4.0 0.33 24 17 150 128 234 29
<0.1
<:0.1 0.22 0.8 0.8 402 4
635 9
<0.1
<0.1 1.2 180 92 282 830 1559 22
<0.1
<0.1 0.22 36 41 88 258 1042 24
<a.1
<0.1 0.22 46 30 245 240 535 24
<0.1
<0.1 0.27 42 10 88 146 460 4
<o.1
<0.1 0.44 40 9
82 136 417 3
<0.1
<0.1 0.33 43 8
82 142 419 4
0.25
<0.1 0.44 l
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Surfoce elevation Pierometric surface elevotion l
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3,7 L Water sompte 13 token 3OO'downstroom Dordonelle 3
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AUGER HOLE DATA Mato see.
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10 3S3' 338' 23 set 326' is 354' 33e' 24 343' 32r 3 })
12 353' 332' 2S 343" 330P
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INVESTIGATIONS a.;
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SI Projected 250' @l NW 360 -
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Dordonelle Reservo.ir v
Normal Pool Elevation y
Ground surface 340 -
U Clay & silty clay 7
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p F 320 -
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re,,,r well p
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water well 280 -
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REFERENCE 9*p 6
PLATE I -- location of r profile.
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Depth,155'
~ (Elev.198) 500 ARKANSAS POWERR & LIGHT CO.
'E GEOLOGIC SECTTION A'-A SHOWING PIEZOMETERIC SURFACE 40 60 N
THROUGH SITE'E AREA 3
6600 F PLATE 2C2 l
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