ML031970777

Email - Groundwater Well Drawdown

ML031970777
Person / Time
Site:	Quad Cities
Issue date:	03/20/2003
From:	Maher W Exelon Corp
To:	Larry Wheeler NRC/NRR/DRIP/RLEP
Wheeler L, NRR/DRIP/RLEP, 415-1444
References
Download: ML031970777 (5)

Text

I Duke Wheeler - Groundwater Well Drawdown Paae 1 1 I Duke Wheeler Groundwater Well Drawdown

- Paoe I I From: 'Maher, William D." william.maher@exeloncorp.com>

To: *Duke Wheeler (E-mail)" <dxw~nrc.gov>, 'McDowell Bruce (E-mail)"

<mcdowell5@ llnl.gov>

Date: 3120/03 7:15AM

Subject:

Groundwater Well Drawdown During the site audit at Quad Cities, a request was made by members of your team to provide a copy of groundwater drawdowns.

Attached you will find a copy of that list.

What follows is further clarification of the listing and what is performed WRT drawdown.

These are the readings taken quarterly when we do our well depth measurements on wells #1 & #5. They are a transposed number from measurements taken by procedure into a spreadsheet after the quarterly well depth measurements. The file is attached below. There is no legal requirement to perform these measurements. It is done for our own information. Some of the early data on the spreadsheet may be in question.

The main thing that the graph shows that the static water level and draw down has varied little over the years.

If looking at the spreadsheet, below is a summary of what the numbers are telling you:

Well #1 pump is set at 147' feet below ground elevation. The pump off reading is the reading taken from the air-line that is attached to the well piping and extends down to the same level that the pump is set. By applying air pressure to the air-line, you can tell how many feet of water are in the air line. The pump off reading subtracted from the air-line length is the static water level in the well. Thus if the pump off reading is 110', then the static water level is 37' (147 - 110). After the pump is started, you then take another reading on the air-line. If the reading after the pump is on is 77', then the draw down in the well is 33' (110 - 77). The original data from well #1 in 1967 had a static water level of 42' and a drawdown of 43'.

Well #5 is set at 205'. The original data from well #5 in 1969 had a static water level of 33' and a drawdown of 20'.

As can be seen by the attached spreadsheet, the static water levels in the wells have been very consistent over the years. The reason for the big difference between drawdown of the two wells is the well casing size and size of the pumps. The diminished drawdown of the individual pumps over the years is from pump degradation and scaling of well piping. The GPD for each well is based on hours the pump is operated and pump design capacity. The actual usage is less than reported, but is the best estimate we have.

If you should have any questions, please feel free to contact me at any time.

Bill 610.765.5939

I Duke Wheeler - Groundwater Well Drawdown Pace 21 I Duke WheelerGroundwater Drawdown - Well Paae 21~~~

<<Groundwater Drawdown.XLS>>

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CC: ClFulvio, Albert A." albert.fulvio~exeloncorp.com>

Ic\ch\excerGroundwater Drawdown.XLS-Graph 07/10/2003 Well #1 Depth Measurements 250 200 F 150 e

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I---- Drawdown -x- Pump On Pump Offl Well #5 Depth Measurements 250 200 F 150 gig e

t 100 50 *

--a-- Drawdown -x- Pump On - Pump Off k6ch~excer\Groundwater Drawdown.XLSGraph 07110/2003

static static Well No.1 Pumping Well No.5 Pumping Date Hours GPD Pump Off Lavel (It) Pump On Drawdown . .

Hours GPD Pumo Off Level (1)

Pumo On Drawdown 3l80 4009 48 99 34 14 10933.0 68 137 46 22 71B9 4496 49.109 48 99 31 17 11351.0 64,303 50 155 86 -16 1080 4802 43.200 110 37 77 33 11568.2 61,327 135 70 155 -20 7890 110M 5154 36414 192 .45 72 120 11762.3 40.159 209 .4 161 48 5773 55.022 106 41 96 10 11933.8 30.489 87 118 87 0 7190 1am~ 5891 38.270 eo 67 78 4 12012.7 51,178 88 117 87 1 17890 152 6 6128 W.255 112 35 es 44 12237.4 57,370 158 47 1l91 G288 25.948 112 35 70 42 12394.7 51.018 160 45 160 0 lSs1 165 4191 6562 39.614 114 33 72 42 12553.1 45,802 170 35 5 5i91 6802 6.000 114 33 72 42 12638.1 41,500 170 35 165 5 7191 6965 36.222 114 33 130 77 116? 12815.8 79,867 157 48 155 2 ml91 7239 44.432 112 35 74 38 10 25 165 15 12(91 7718 63165 112 35 74 38 13228.5 6O,029 165 40 160 5 1V92 7769 43.714 85 62 76 7 13260.8 55,371 154 51 1192 13293.3 78,00o 167 38 160 7 4/92 7982 29.379 112 35 73 39 13542.0 77,517 157 38 167 0 7192 8522 6211 112 35 76 36 13838.3 74,855 167 38 160 7 8917 57.8W 112 35 s0 32 14153.8 9Z341 168 37 182 6 12192 9301 56.195 112 35 78 34 14433.0 61,717 165 40 182 3 3193 9570 41.385 112 35 77 35 4193 14789.7 74,136 165 40 182 3 els3 9818 33,067 116 31 85 31 14928.1 84,434 168 37 158 10 10203 40.174 114 33 84 30 15289.5 75,423 168 37 158 10 12193 10464 44.743 110 37 74 36 15473.0 84,629 160 45 160 0 3ta4 10713 35.153 112 35 82 30 15729.1 70,899 165 40 76?? 89?

els4 11092 48.383 114 33 84 30 15969.0 61,251 s04 11463 42.000 112 35 S0 32 16297.2 74,309 11737 45,041 11e 31 82 34 16479.6 59,967 3195 12171 52,080 110 37 76 34 16765.1 68,520 12665 63,742 115 32 80 35 13s67.8 28,503 13022 49.241 113 34 75 38 17136.9 74,234 12195 13505 57,386 111 36 81 30 17395.8 81,521 396 13906 65.027 112 35 84 28 17665.0 87,308 s96 14274 46,979 114 33 as 28 17847.7 46.647 14709 58,000 110 37 84 26 16104.0 68,347 12196 15260 61222 111 36 80 31 18326.5 49,444 397 15732 71,696 111 36 80 31 18481.1 48.967 8097 16280 65.109 114 33 85 29 18678.3 46A59 w97 16937 84.774 11e 31 84 32 18823.4 37,445 12187 17297 57,600 111 36 78 33 18977.0 49,152 398 17674 49.714 111 36 76 35 19168.0 50,374 18274 79,121 113 34 79 34 19383.1 5e.730 969 19585.8 52,310 164 41 160 4 18607 42,968 113 34 85 28 12198 18732 16.667 112 35 84 28 19902.0 84,320 163 42 158 7 3ss oos 147 20230.5 70.393 163 42 158 5 4199 18975 21,761 113 34 78 35 6M9 19174 42,643 115 32 82 33 20399.8 52,092 1e9 36 164 5 uss 19188 14,000 115 32 82 33 20442.1 84,s6 186 39 1e2 4 wss 19418 30,330 106 41 72 34 20764.0 84,897 169 36 164 5 12/99 19773 69.167 117 30 85 32 20898.7 44.90 168 37 160 6 30DO 20150 49,174 112 35 es 44 21071.0 44,948 168 37 163 5 GMo 20435 37,174 115 32 80 35 21231.0 41,739 170 35 165 5 890 20773 41,814 117 30 82 35 21444.0 s2,701 170 35 185 5 1/01 21434 57.065 110 37 80 30 21914.0 81,151 188 37 183 5 4/01 21713 39.388 112 35 70 42 22069.0 49,412 170 35 167 3 7/01 22014 36.857 112 35 70 42 22303.0 52,408 170 35 185 5 11/01 22550 56,920 111 36 72 39 22482.0 38,018 168 37 164 4 2102 22939 53045 112 35 71 41 22630.4 40,473 168 37 163 5 5/02 23329 49,787 115 32 72 43 22757.0 32,323 172 33 167 S am9 23686 55,636 112 35 80 32 22915.0 49,247 171 34 171 0 11/02 24323 76,440 112 35 76 36 23042.0 30,480 170 35 165 5 3/03 25147 87,504 112 35 76 36 23175.0 28,248 169 36 165 4 Ave. 49338 112 37 78 34 58965 167 38 162 5 Averages calculated from the period 100 -present wfth 7191S 3894 data being discarded.

Weon Depth (t) Ar ine bingth (It) 1 250 147' 2 255 3 1800 4 1796 5 264 205' Eig Fish 175 Fire Prot 225 kdchexcehtGrourndwatar Drawdown XLSWELLS 07o10i03