ML20210R145

Groundwater Monitoring,Jul 1985 - June 1986. W/One Oversize Figure

ML20210R145
Person / Time
Site:	Vogtle
Issue date:	06/30/1986
From:	BECHTEL CIVIL & MINERALS, INC. (SUBS. OF BECHTEL
To:
Shared Package
ML20210R128	List: ML20210R124 ML20210R145
References
NUDOCS 8610070132
Download: ML20210R145 (74)

Text

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September 1986

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i V0GTLE ELECTRIC GENERATING PLANT GROUND-WATER MONITORING July 1985 - June 1986 L

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I TABLE OF CONTENTS I

Page 1.0 Review of First 6-Months Assessment 1 2.0 Monitoring System 2 3.0 Monitoring Frequency 2 4.0 Water-Level Measurements 3 5.0 Water-Table Fluctuations 4 5.1 Response to Precipitation 5 I 5.2 5.3 Response to Barometric Pressure Response to Construction Activities 6

7 5.4 Anonalous Fluctuations 8 6.0 Confined Aquifer Fluctuations 8 7.0 Blue Bluff Marl Pore Pressure 9 8.0 Future Monitoring of Wells 10 I

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I I TABLES I 1 Observation Wells I

2 Piezometers in Blue Bluff Marl FIGURES I 1 Observation Wells and Rain Gauges

. 2-18 Water Table Hydrographs 19-29 Tertiary Aquifer Hydrographs 29 & 30 Cretaceous Aquifer Hydrographs I.. 31-36 Blue Bluff Marl Hydrographs 37 Hydrographs - Wells 808 and LT-13/ Precipitation - WF Gauge I 38 Water Levels - Barometric Pressure June 24-July 6, 1986 APPENDIX g se.e. x.ar e,dro.ra hs - Wat.r Tah1. a.d T.rti.r, A,uif.rs i

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I GROUND-WATER MONITORING I JUNE 1985 - JUNE 1986 A program of frequent measurement of water-table wells and piezometers in the Blue Bluff marl was implemented in July 1985. The purpose is to provide more detailed information to support the basis for the hydrostatic loading design. This is in response to the NRC staff concerns that the previous water-level records were short as a basis to

... confidently project a probable maximum design-basis ground water i level..." (Section 2.3.12.6 SER, 7/85), and that wells should be installed in the Blue Bluff marl to determine the pressure distribution throughout the full depth of the marl (Section 2.4.12.2.2, SER, 7/85).

Less frequent monitoring of wells in the Tertiary and Cretaceous aquifers is included in the program. The staff requested that upon completion of 6 months of monitoring and, again, upon completion of one year of monitoring, reports should be submitted for review of the data collected. The first 6 months of monitoring was completed December 31, 1985, and the results submitted by report in February 1986. The second six months of monitoring was completed June 30, 1986, and the results are I submitted in this report. The data are presented in hydrograph form, providing a full year of data during the period of frequent measurements, July 1, 1985 through June 30, 1986. Additional data are also provided, including precipitation and barometric records to demonstrate relationships with the water-level fluctuations.

1.0 Review of First 6-montht Assessment I

In the report of February 1986, it was observed that the first 6-months of frequent monitoring indicated that there is no immediate response of ground-water levels in the plant area to individual rain storms, although a detectable rise in levels can result from a persistently wet period that continues for more than a month.

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The data indicated that a general rise of 1 foot, or more, requires a seasonal period of markedly wet weather (at least 3 months). It was concluded from these observations that monitoring the wells monthly would readily identify such a water-level trend. Regardless, there was no reduction in monitoring frequency during the first year of the program.

I 2.0 Monitoring System Locations of all monitor wells are shown on Figure 1. Well and piezometer construction details are summarized in Tables 1 and 2. There are 17 wells monitoring the water-table aquifer. Four of these wells (LT-1B, LT-7A, LT-12, and LT-13) are within the foundation area of the power-block structures in which all materials above the Blue Bluff marl (the Barnwell sands and Utley limestone) were removed and replaced with densely compacted, selected backfill. This excavated and backfill area is shown on Figure 1. The water-table in this area is within the Er backfill material. Elsewhere, considerable excavation and backfilling has been done for site grading, but none of those excavations extend

, below the water table. Thirteen water-table observation wells outside the principal excavation monitor the aquifer within undisturbed Barnwell sands and Utley limestone.

A series of 6 Casagrande-type piezometers have been set in the Blue Bluff marl. They are in two clusters (A and B on Figure 1) of 3 piezometers I

each. The piezometers in each cluster monitor pore pressure in the upper, middle and lower portions of the marl. In addition, 10 wells are open to the Tertiary aquifer immediately below the Blue Bluff marl. Two observation wells in the Cretaceous aquifer are also being maintained.

3.0 Monitoring Frequency Two of the wells in the water-table aquifer, 808 and LT-13, are being monitored on a continuous basis. Stevens Type-F recorders have been I installed at each well. The recorders are geared for a direct scale (1:1 ratio) reading. Eight-day charts are used. The objective has been to determine the rate and degree of fluctuation in response to rainfall, I which is the source of recharge to the aquifer.

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The balance of the water-table aquifer wells (15) are measured on a weekly interval. With each water-level measurement, depth to the base of each well is also measured to determine if silting is occurring. Early detection of silting will prevent plugging and questionable data. The wells in the confined aquifers (Tertiary and Cretaceous) are monitored on a monthly basis concurrently with measurements in the water-table aquifer.

The six piezometers open to the Blue Bluff marl are also being monitored I weekly. These piezometers are measured the same day each week as the wells in the water-table aquifer.

Precipitation is being recorded at the meteorological tower (the "MT" gauge) using a climatronics Model 10097-1 (continuously recording, tip-bucket type) rain gauge. Precipitation is also being collected on a I daily basis with a Taylor Clear-Vu, 4-inch diameter gauge at the sewage waste discharge facility; (the "WF" gauge). Locations of these gauges are shown on Figure 1.

I 4.0 Water-level Measurements I

The actual monitoring of water levels is conducted by on-site personnel of the Vogtle EGP Environmental Croup under the supervision of N.D.

Dennis. Technical direction and review has been the responsibility of C.R. Farrell and L.R. West, hydrogeologists with Bechtel. A monitoring procedure has been established, and data are reported on a weekly basis.

I When a water level is measured, the well depth is also sounded for indication of silting. Immediately following completion of the weekly round of monitoring, the measurements are compared to the prior data of each well by the on-site personnel. Any water level that appears anomalous is checked by remeasurement within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The checked weekly water levels are then submitted to the Bechtel hydrogeologists for technical review.

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I I The results of the monitoring have been uced to prepare hydrographs for each well or piezometer. Hydrographs of weekly measurements of the 17 water-table wells for the year commencing July 1985 are in Figures 2 through 18.

I Hydrographs of observation wells open to the Tertiary (confined) aquifer are shown on Figures 19 through 28. These wells are monitored once each month. Hydrographs of the two monitored wells open to the Cretacuous Monitoring of these I

(confined) aquifer are shown on Figures 29 and 30.

wells commenced in August 1985. Finally, hydrographs of the 6 piezometers monitoring pore pressure in the Blue Bluff marl are shown on Figures 31 through 36.

Some of the observation wells have been monitored since 1971 and others for shorter periods, ranging from 1 to 10 years. All of the data available through January 1985 was submitted in the Ground Water Supplement, March 1985. Hydrographs for the period 1980-1986 of the water-table wells, and of the two Tertiary wells, 27 and 29, that have I been present for that period, are included as an Appendix in this report.

5.0 Water-table Fluctuations The intention of the frequent monitoring of wells in the water-table aquifer was to establish the kinds of fluctuations that may occur, including the period and magnitude of these fluctuations. Of primary concern was the correlation with precipitation events; the response to recharge from direct precipitation. Figure 37 correlates daily water I levels measured at observation wells 808 and LT-13 with rainfall recorded at the WF gauge. Measurement at the WF gauge began six months prior to the commencement of frequent water-level monitoring providing a continuous record with antecedent rainfall.

I A second meteorological factor causing fluctuations in water levels in wells is variation in barometric pressure. Figure 38 correlates the I

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continuously recorded water levels in wells LT-13 and 808 with the two-week microbarograph recording made at the Vogtle Plant beginning June 23, 1986. Finally, water use in construction of the Vogtle Plant has had a significant impact on water levels during the year of monitoring.

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• 5.1 Response to Precipitation. The results of the first 6 months of L

continuous records at wells LT-13 and 808 were sufficient to demonstrate there is no detectable response of the water table to individual rain 7

L storms, several storms occurred during the first 6 months, including an intense 2-day storm greater than 3.5 inches in November. These data are described in more detail in the six-month report of February 1986. It .

was concluded that a discernable, general rise in the water-table in response to rainfall requires a period of persistent and significantly wet weather. The second 6 months of monitoring, January through June of 1986, further confirm that the water-table does not respond to individual storms. This is illustrated by Figure 37. Although the last six months includes an extreme drought, the few storms that did occur are not reflected in the water-table.

A seasonal fluctuation of rising water levels in late fall and winter, and declining water levels in late spring and summer should be expected.

It is a natural response to recharge from precipitation and variations in evapotranspiration. Nearly all of the well hydrographs follow this general pattern. However, they are affected to varying degrees by the construction activities, as has been discussed previously in the six-month report of February 1986. Those wells believed to be least affected by construction activities during the first year of the monitoring program include those to the south and southwest of the power block area, i.e., 803A and 805A. The seasonal fluctuations at these wells are estimated at 0.75 and 0.95 foot, respectively. The maximum water level at these wells in response to recharge variations appears to have occurred in late March to early April.

This is in contrast to seasonal fluctuations of over 2 feet and the maximum water levels occurring in January or late February at wells in the primary areas of construction /backfilling activities. Some impact of (1945g) ~

I I construction activities (recharge from applied construction water) is reflected in the water-table fluctuations throughout the site. For example, a net rise in water level during the year of monitoring occurred in all wells except 179, in spite of the extended drought of spring and early summer 1986. The largest rises occurred in those areas where concentration of surface waters occurred, either through backfilling operations, or by ponding. The impact of construction activities is discussed further in Section 5.3.

I 5.2 Response to Barometric pressure. The small, but repetitious diurnal fluctuations observed on the continuous records of water levels in wells LT-13 and 808 prompted the temporary installation of a microbarograph at the plant site to determine the degree of correlation with barometric pressure. As indicated by Figure 38 there is a very close correlation to these diurnal fluctuations in both water-level records. These fluctuations are caused by the solar atmospheric tide with two maximum and two minimum pressures daily. The primary maximum pressure occurs at about 10 AM, and the secondary maximum at about 10 PM.

I Somewhat unexpected is the close response to longer period-pressure transients (resulting from the migration of low and high pressure systems in the atmosphere) by the water level in LT-13, but with only a minor response in 808. The densely compacted backfill at LT-13, and the presence of large buildings covering much of the area surrour. ding the LT-13 site apparently provide a more effective barrier to the longer-period atmospheric pressure transients reaching the aquifer than l

do the natural, undisturbed materials that comprise most of the materials overlying the aquifer at the 808 site.

The impact to water-level measurements at those wells by their differing responses to pressure transients is illustrated, first, by the hydrographs of Figure 37, and secondly by the hydrographs of Figures 5 and 17. The hydrographs are prepared from the daily high levels taken from the continuous recordings; Figures 37 shows each daily reading, and I

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I I Figures 5 and 17 are based on weekly levels. They indicate larger short-term fluctuations (i.e., one week or less) at LT-13 than at 808.

This is a reflection of the greater response at LT-13 to the longer-period pressure transients, since the response to diurnal fluctuations are of similar magnitude at both wells (Figure 37). The hydrograph of 808, Figure 17, shows little weekly fluctuation, whereas at LT-13, Figure 5, a fluctuation of as much as 0.4 foot is present; a response to the irregular pressure transients of low and high pressure I

systems.

Reviewing the hydrographs of observation wells, all three of the other wells in backfill (Figures 2, 3, and 4) have similar or slightly larger weekly fluctuations to those of LT-13. All of the wells outside the backfill, except 179, show short-term fluctuations greater than 808.

Some (i.e., 806B) approach that of LT-13. Most indicate fluctuations somewhat less than LT-13, but a few are of the same magnitude (i.e., 804, 806B and 807A).

I 5.3 Response To Construction Activities. As discussed in detail in the February 1986 six-month report, the relatively large and rapid rises of water levels in the fall and winter are attributed in large part to be in response to localized recharge of water from backfilling operations and from the ponding of runoff in temporary depressions and excavations during construction. Backfilling of excavations was nearly complete by the end of March 1986, so that recharge from those operations was l

relativery minor during the last 3 months of this reporting period.

Plant grade has been achieved in over 80% of the area around the power I block. Although the water table began declining in February, March, the impact of this temporary source of recharge has been to maintain water levels higher than they would be under normal conditions of recharge. As pointed out above, there was a net rise in the water table during the year of monitoring, which was a year of markedly low rainfall. Backfill operations and ponding during construction activities provided sufficient recharge to offset the subnormal rainfall. With the cessation of construction activities that contribute recharge, and final grading of I

the plant site completed, the water-table can be expected to continue to drop in the power block area.

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F q 5.4 Anomalous Fluctuations. In the February, 1986, six-month report, three wells were reported to have single measurements that deviated

[ significantly from the general trend and short-term fluctuations (801, L

806B and 807A). It was stated that these measurements were believed to be in error, although they were not checked within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> for

• verification. Although the procedure for checking has since been g reviewed and established with field personnel, it was not until February L 1986 that the checking was begun. one additional anomalously low and unverified measurement was made at 806 B in January.

It has been demonstrated that a short-term fluctuation, or envelope of measured levels of 0.4 foot, as a result of pressure transients, is normal at LT-13. The fluctuations are somewhat less at most other water-table wells. A single measurement deviating from the trend or average water-level within that envelope of more than 0.2 foot can, therefore, be considered unusual. The anomalous measurements at wells 801, 806B and 807A deviate more than 0.6 foot from the hydrograph trends and are single isolated measurements. They are considered erroneous measurements.

The elevations of water levels at two wells (801 and 807A) have been corrected as a result of resurveying the reference elevations. An inferred correction at 807A was discussed in the six-month report. The correction at 801, which was determined in May 1986, indicates the water-level elevations previously reported at that well are 1-foot lower. The hydrographs of these wells in this report reflect the elevation corrections, 6.0 Confined Aquifer Fluctuations Water levels measured in the wells open to the Tertiary aquifer fluctuated from 2 to 4 feet during the first year of the monitoring program. In the two wells open to the Cretaceous aquifer the levels fluctuated 8 and 9 feet. Based on the monitoring of these wells, the trend of levels during the year was downward beneath the site in both (1945g) -

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i aquifers. The level of the Tertiary aquifer dropped 1 foot, and the I Cretaceous aquifer level dropped approximately 7 feet. A portion of the decline may be attributed to adjustment of the aquifers to pumping of the l site water supply wells. However, because the supply wells have been operating intermittently for over 4 years, and at less than design capacity, the portion of the decline that can be attributed to on-site l

pumping is minor. It is probable that the decline is primarily in e response to seasonal, and longer, variations in recharge, (the last two 1

L years have been below normal rainfall), and to increased pumping by wells outside the site area.

I The relatively uniform decline of about 1 foot during the year of

, monitoring at all wells open to the Tertiary aquifer supports this L

hypothesis. Longer term records at two Tertiary wells, 27 and 29, indicate this downward trend began in 1985. Since 1980, the general trend appears to be near constant, with only a slight total decline; about 2.5 feet in 6 years. A seasonal fluctuation of 1.5 to 2 feet is indicated by these wells during the past two years.

The relatively uniform decline of levels during the first six months of monitoring at the Cretaceous wells appears to have ceased in the second six months (Figures 29 and 30). This is confirmed by measurements in July and August 1986; the water level in both wells appears to have stabilized, although fluctuating as much as 2 feet from month to month.

A range of fluctuation of 6 to 8 feet is not unreasonable for the confined Cretaceous aquifer.

7.0 Blue Bluff Marl Pore Pressure

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The two clusters of piezometers (A and B) within the marl are located at opposite corners of the power block as shown on Figure 1. The NRC staff requested that the clusters be installed to provide additional detail on the pore pressure distribution within the marl. Previous information was limited to the 42 series well cluster that was installed in 1971 and s removed in 1974.

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As discussed in the February 1986 six-month report, the data from these clusters are consistent with that collected in the 42 series cluster; decreasing head with depth within the marl. The second six months of data indicate the piezometers have essentially stabilized, and a seasonal fluctuation of similar magnitude to that of the underlying Tertiary I aquifer is indicated by the hydrographs (Figures 31 through 36).

Further, the fluctuation in the marl occurs essentially coincidentially (no time lag) with that of the Tertiary aquifer, indicating a pressure response rather than migration of water within the marl. The low permeability of the marl precludes such close correlation of fluctuation with that of the aquifer to be caused by reovement of water into or out of the marl.

I Monitoring at 904B continues to demonstrate that the piezometer is open to an unsaturated zone in the marl.

I 8.0 Future Monitoring of Wells The report on the first six months of monitoring concluded that frequency of monitoring most wells could be reduced to monthly. It was recommended that the continuous recorder wells (808 and LT-13) be maintained and wells monitoring the water-table aquifer within the backfill adjacent to structures (LT-1B, LT-7A, LT-12) continue to be monitored weekly. This was suggested in consideration of the daily and other short-term I fluctuations being caused by construction activities. It is apparent now that atmospheric pressure transients are causing the daily fluctuations, I as well as other short-term (weekly) fluctuations observed. During the second six-months of monitoring there have been no large or unusual short-term fluctuations, and construction backfilling is nearly complete.

Regardless of the conclusions from the first six-months monitoring, the original frequency has been maintained at all wells, and has continued to date. This provides more than a year of continuous monitoring at wells i

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I 808 and LT-13, and weekly monitoring at all water-table wells and the piezorneters in the Blue Bluff marl. This record provides a reference base demonstrating the range of normal, short-term fluctuations to be expected. The record also indicates that the response of the water table lags by more than a month a persistent increase in recharge, i.e., above normal rainfall. It is apparent from this that a significant rise of the water table (0.5 foot, or more) can be readily detected by monthly monitoring of the observation wells. This will provide adequate definition of water-table fluctuations significant to assessment of the I design-basis ground-water level.

Reducing the monitoring frequency of all wells to monthly is planned.

I Unless the NRC staff disagrees, it is planned to remove the continuous recorder at well 808 in October 1986, and the recorder at well LT-13 in November 1986. Monitoring of all other wells, including the water table wells and marl piezometers, is planned to be reduced to monthly following October 1986. This program will be maintained with any modifications requested by the NRC staff until July 1987 when the third report will be submitted, describing the results of the second year of the monitoring program.

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TABLE 1 - OBSERVATION WELLS Ground Depth Depth of e Surface Top of Monitored L Welt instatted coordinates Elev.(2) nart(2) inter a1(2)

No. (Yc.) N E (ft.) (ft.) (ft.)

Water-table aquifer 129 1971 8856 9576 215.9 77 35 - 100

[ 142 1971 8283 8262 231.2 92 52 - 101 L 179 1971 9059 7779 274.8 130 90 - 131 800 1979 8850 11011 213.7 83 59 - 94 801 1979 7656 10733 212.8 82 49 - 87.5 802A 1985 7196 10194 216.9 87.5 72 - 90 803A 1979 7085 8898 218.3 82 42 - 87 804 1979 6597 8227 224.1 87 49 - 102 805A 1979 6672 10403 232.7 124 69.5-127 806B 1980 8821 9726 214.8 77 23 - 70

[ 807A 808 1980 1985 9047 9625 9835 9300 213.6 207.0 77 66.3 36 - 80 45.5- 68 809 1985 8320 7860 222.8 89 69.4- 90 LT-1B 1985 8388 9304 213.2 83.3 65.2- 84.7 LT-7A 1985 8151 9317 215.9 87 65 - 87 LT-12 1985 7775 9600 209.0 79 58.2- 78.6 LT-13 1985 8135 10110 219.0 89 68.1- 89.1 Tertiary aquifer 27 1971 8622 13931 210.0 146 - 190 7 29 1971 9975 12392 193.0 124 - 210 34 1971 12180 10846 86.0 47 - 115 850A 1984 11723 10494 225.9 147 - 200 851A 1984 8868 7066 262.7 235.7-300 852 1984 5993 13380 200.7 159.1-220 853 1984 11020 9204 227.6 176.3-217 854 1984 9899 7917 236.8 174 - 220 855 1984 7159 13951 218.0 192 - 240 856 1984 4927 12558 186.7 156 - 197 cretaceous aquifer TW-1 1972 7738 9984 218.5 506 - 850 NU-2 1977 9500 9135 214.5 450 - 820 NOTES:

(1) Determined at time of dri111ng.

(2) Below ground surface at time of drilling.

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I TABLE 2 - PIEZ0 METERS IN BLUE BLUFF MARL I

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Ground Depth of l Surface Depth of Monitored )

Well Installed Coordinates Elev.(1) Marl (2) Interval (2)

No. (Yr.) N E (ft.) (ft.) (ft.)

900 1985 7538 10119.5 216.3 92.6-148 133.8-140.7 901 1985 7538 10104.5 215.58 91.6-148 122.0-128.0 902 1985 7543.5 10110.5 215.97 91.0-148 101.5-108.0 903 1985 8480 8900 215.75 78.0-148 127.0-133.0 904B 1985 8464 8885 215.75 78.8-148 90.0- 96.7 905 1985 8450 8900 215.75 77.3-148 109.8-116.0 NOTES:

(1) Determined at time of drilling.

(2) Below ground surface at time of drilling. Bottom depth of marl is interpolated from figure 2.5.1-31, FSAR.

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1 V0GTLE ELECTRIC GENERATING PLANT GROUND-WATER MONITORING July 1985 - June 1986 APPENDIX HYDROGRAPHS FOR PERIOD 1980-1986 I

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