HomeMy WebLinkAbout20021897.tiff STATE OF COLORADO
Roy Romer,Governor
Patti Shwayder,Acting Executive Director of"CO40
Dedicated to protecting and improving the health and environment or the people of Colorado „�
HAZARDOUS MATERIALS AND WASTE MANAGEMENT DIVISION • •
4300 Cherry Creek Dr.S. 222 S.6th Street,Room 232 `1176
Denver,Colorado 80222-1530 Grand Junction,Colorado 81501-2768
Phone(303)692-3300 Phone(303)248-7164 Colorado Department
Fax(303)759-5355 Fax(303)248-7198 of Public Health
and Environment
March 22, 1995
Weld County Board of County Commissioners
County Commissioners Office
915 10th Street
Greeley, Colorado 80632
RE: Determination of Impact to Ground Water
Weld County Waste Disposal
Weld County, Colorado
Dear Commissioners:
The Solid Waste Section of the Hazardous Materials and Waste Management Division (the
Division) has completed another review of ground water monitoring data for the Weld
County Waste Disposal liquid waste disposal facility. This facility, which is located at the
intersection of County Roads 12 and 35 in southern Weld County, has been the subject of
review by the Division and the Weld County Health Department for approximately two
years.
The Division's review of ground water monitoring data, as presented here, was requested
by the Board of County Commissioners to clarify the impact of the facility as discussed
during the March 1, 1995 hearing. At that hearing, some questions were raised regarding
the Division's August 26, 1993 initial determination of impact to ground water. This second
statistical analysis of the data is meant to address those questions.
In this second analysis of data, the scope of the analysis was increased to include seven
monitoring wells at the facility. The wells analyzed consist of the six originally specified in
the facility's Special Use Permit (wells MW-1, MW-4, MW-8, MW-9, MW-12, and MW-13),
as well as monitoring well MW-5, which has historically shown levels of contaminants
significantly higher than the other wells at the facility and in excess of established state
water quality standards. The chemical constituents used in this statistical analysis consisted
of ten inorganic chemicals analyzed for by the Weld County Health Department laboratory.
Based on the determination of ground water flow direction as presented in the Groundwater
Technology, Inc. October 22, 1993 report, wells MW-1, MW-12, and MW-13 were selected
as upgradient or background wells, and wells MW-4, MW-5, MW-8, and MW-9 were
EXHIBIT
4
2002-1897
Weld County Commissioners
March 22, 1995
Page 2
selected as downgradient or compliance wells. The statistical analysis of the data was
performed using U. S. Environmental Protection Agency accepted methods as documented
in the GRITS/STAT computer software manual and other EPA guidance documents. In
essence, the statistical test used compares the mean (average) concentration of the selected
chemicals in the upgradient and downgradient wells. If there is a statistically significant
difference between the upgradient and downgradient wells, the downgradient wells that show
evidence of contamination are specified in the computer printout.
The computer printouts attached to this letter show the results of the statistical analyses
performed on the referenced data. The results of this analysis indicate that, of the seven
wells analyzed, three wells — MW-5, MW-8, and MW-9 -- showed significant evidence of
contamination. Of the ten chemical constituents used in the analysis, MW-S showed
contamination from nine (9) constituents, MW-8 showed contamination from eight (8)
constituents, and MW-9 showed contamination from six (6) constituents.
In addition to the statistically significant increases shown by the statistical analysis of ground
water data, a further analysis shows that ground water downgradient of the Weld County
Waste Disposal facility has exceeded established state water quality standards for several
chemicals. These standards are established by the Water Quality Control Commission of
the Colorado Department of Public Health and Environment. Primary Standards are based
on the risk certain chemicals pose to human health if consumed, and are intended to protect
the public from acute and chronic health effects. Secondary Standards are set to protect
water resources from degradation, and are established for contaminants which are not
directly related to the safety of the drinking water, but rather the aesthetic quality.
Table 1 attached to this letter shows the range concentrations of hydrocarbon-based
chemicals detected in the ground water at the facility, and the Primary Standards for these
chemicals where standards exist. Table 2 shows the maximum concentration for the ten
inorganic chemicals tested for and the applicable Secondary Standards. Both tables show
which wells contained the specific range of concentrations or maximum concentrations for
hydrocarbons and inorganics, respectively. Of the eight (8) hydrocarbons detected at the
facility, five (5) have established standards, and two (2) have exceeded the applicable
standard. For the ten (10) inorganics, four(4) have secondary standards, three (3) of which
have been exceeded. Exceedance of state water quality standards by Weld County Waste
Disposal is clear evidence of an impact to ground water, and further establishes the
potential threat to human health caused by this facility.
In addition to the Primary and Secondary Standards for ground water, the staff of the Water
Quality Control Division have provided information on Health Advisories and
Recommended Limitations for some of the chemical constituents detected at the facility.
Health Advisories and Recommended Limitations are based primarily on ongoing research,
Weld County Commissioners
March 22, 1995
Page 3
or on health risks to limited groups of individuals. For example, the Recommended
Limitation for sodium is based on the effect sodium can have on individuals with heart
disease or high blood pressure. Where applicable, information on Health Advisories and
Recommended Limitations is presented in Tables 1 and 2.
This letter is intended to reiterate and reaffirm the Division's position as originally stated
on August 26, 1993 that Weld County Waste Disposal has impacted the shallow ground
water in the vicinity of the facility. I hope this letter serves to clarify for the Commissioners
the effect this facility has had on the ground water in the vicinity of the facility.
If you have any questions, please contact me at (303) 692-3462.
Sincerely, •
,Stephe Laudeman, P.E.
Geological Engineer
Solid Waste Section
Hazardous Materials and Waste Management Division
enclosures
cc: Howard Duckworth, Weld County Waste Disposal, w/enclosures
Richard C. Judd, Attorney, w/enclosures
Don Shosky, Groundwater Technology, Inc., w/enclosures
Tim Monahan, Attorney General's Office, w/enclosures
Keith Schuett, Weld County Planning Department, w/enclosures
Trevor Jiricek, Weld County Department of Health, w/enclosures
File: SW/WLD/WEL/1A
Weld County Waste Disposal
Summary of Ground Water Contamination and Applicable Standards
TABLE 1
Range of Detected Primary Secondary Health
Parameter Concentrations in Wells Standard Standard Advisory
(PPb) (ppb) (PPb) (ppb)
1,1,2,2—Tetrachloroethane 8.4 MW-5 — — —
1,2—Dichloroethane 4.3-6.59 MW-5 0.4 — —
1,2,4—Trimethylbenzene 2.1 MW-8 — — —
Bromomethane 14 MW-8 — — 10
Benzene 4.29-183 MW-5, MW-7, MW-8 5.0 — —
Ethylbenzene 15.6 MW-8 680 — —
Toluene 2.2-237 MW-5, MW-8 1000 — —
Xylenes 12.4-168 MW-5, MW-8 10000 — —
TABLE 2
Maximum Detected Primary Secondary Recommended
Parameter Concentration in Wells Standard Standard Limitations
(PPm) (PPm) (PPm) (PPm)
TDS 19700 MW-8 - 900 -
Sodium 5700 MW-8 — — 200
Chloride 11000 MW-8 — 250 —
Hardness 4500 MW-5 — — 400
Alkalinity 1100 MW-8 — ' — —
Calcium 3200 MW-5 — — —
Magnesium 460 MW-9 — — 29
Potassium 1200 MW-8 — — —
Iron 250 MW-8 — 0.3 —
pH 6.4 - 7.7 ALL — 6.5 - 8.5 —
Secondary Standard for TDS computed by 1.25 X Background Concentration
March, 1995
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Tskal-Wallace Test
ort Printed: 03-13-1995 14 :50
Facility:WCWD Weld County Waste Disposal
Address: 5019 WCR 35
City:Fort Lupton ST:CO Zip:80621
County:WELD
Contact:Howard Duckworth
Phone: (210) 525-1940
Permit Type:Detection
Constituent TDS Total Dissolved Solids
CAS Number
MCL: 500000.000 ppb
ACL: 0.000 ppb
Detect Limit: 1000.000 ppb
Start Date:Aug 13 1990
End Date:Dec 27 1994
Data Mode:Orig nal
Background Wells
Well ID N IND Max Value Min Value Mean Std? Dev
MW-1 17 0 800000. 00 630000. 00 714352.94 56388 . 10
MW-12 14 0 2100000. 00 1530000. 00 1827142.88 175474 . 23
MW-13 16 0 2470000. 00 1680000 . 00 2193124 .75 184705. 86
Compliance Wells
'Well ID N %ND Max'Value : Min Value Mean StdDev
MW-5 13 0 18920000.00 4320000. 00 13428846. 00 5141814 . 50
MW-8 18 0 19700000. 00 3790000. 00 6332778.00 3795160. 50
MW-4 7 0 740000. 00 570000. 00 644285. 69 57404 . 16
MW-9 16 0 9500000. 00 6100000.00 7398750.00 992403 . 56
H Statistic: 82. 6522
H Adjusted for Ties: 82 . 6676
lyegrees of Freedom: 4
Chi-Squared: 9. 4878
Za/DF: 2 . 2414
* Indicates significant evidence of contamination
Well ID Crit. Diff. Rank Avg. Background Rank Avg. Difference
*MW-5 20 . 5740 89 . 62 30.56 59. 05
-8 18 . 1985 68. 33 30.56 37.77
“4-4 26. 5988 6.93 30.56 -23 .64
*MW-9 19 . 0031 79 .44 30.56 48. 87
r^-,
e
K,gskal-Wallace Test
I art Printed: 03-13-1995 14 :53
Facility:WCWD Weld County Waste Disposal
Address:5019 WCR 35
City:Fort Lupton ST:CO Zip:80621
County:WELD
Contact:Howard Duckworth
Phone: (210) 525-1940
Permit Type:Detection
Constituent Na Sodium
CAS 'Humber`'. 7440-23-5
MCL: 20000. 000 ppb
ACL: 0. 000 ppb
Detect Limit: 5000.000 ppb
Start Date:Aug 13 1990
End Date:Dec 27 1994
Data Mode Original
Background Wells
well ID N %ND Max Value Min Value Mean Std Dev
MW-1 17 0 150000. 00 120000. 00 141764.70 8828.43
MW-12 14 0 360000.00 180000.00 317857. 13 46769.25
MW-13 16 0 710000. 00 430000.00 592500. 00 88806.91
Compliance Wells
Well' ID N %ND Max Value Min Value Mean Std Dev MW-5 13 0 4700000. 00 1500000.00 3630769.25 1138994.25
MW-8 18 0 5700000.00 990000. 00 1793888.88 1116860.75
MW-4 6 0 52000.00 44000.00 49000.00 3098.39
MW-9 16 0 1200000. 00 110000.00 992499.94 248555.83
H Statistic: 82. 0951
H Adjusted for Ties: 82 .2017
4agrees of Freedom: 4
Chi-Squared: 9.4878
Za/DF: 2 .2414
* Indicates significant evidence of contamination
Well ID Crit. Diff. Rank Avg. Background Rank Avg. Difference
* 7-5 20. 3692 91. 96 31.00 60.96
7 -8 18.0173 78.50 31.00 47.50
MW-4 28 . 1794 3 .50 31. 00 -27.50
*MW-9 18.8139 60.22 31. 00 29.22
Kp ska1-Wallace Test
R )rt Printed: 03-13-1995 14:56
Facility:WCWD Weld County Waste Disposal
Address: 5019 WCR 35
City:Fort Lupton ST:CO Zip:80621
County:WELD
Contact:Howard Duckworth
Phone: (210) 525-1940
Permit Type:Detection
Constituent:Chloride Chloride
CAS Number: 16887-00-6
MCL: 250000.000 ppb
ACL: 0.000 ppb
Detect Limit: 3000.000 ppb
Start Date:Aug 13 1990
End Date:Dec 27 1994
Data ;Mode:Original
Background Wells
Well ID N %ND Max Value Min Value Mean Std 'Dev
MW-1 17 0 120000.00 67000.00 94000.00 20582 . 15
MW-12 14 0 230000.00 140000.00 172857. 14 27295. 70
MW-13 16 0 300000.00 180000.00 224374. 98 27560. 54
Compliance Wells
Well ID N %ND Max Value Min Value Mean Std :Dev
MW-5 13 0 10000000. 00 950000. 00 6879999.50 3274795.00
MW-8 18 0 11000000. 00 1200000. 00 2832222 .25 2314884.25
MW-4 7 0 97000. 00 63000. 00 73000.00 11298 .97
MW-9 16 0 1000000. 00 500000. 00 766250. 00 143706.86
H Statistic: 86.3690
H Adjusted for Ties: 86.4168
agrees of Freedom: 4
Chi-Squared: 9.4878
Za/DF: 2. 2414
* Indicates significant evidence of contamination
Well ID Crit. Diff. Rank Avg. Background Rank Avg. Difference
,WW-5 20. 5740 91.85 30. 63 61.22
4-8 18. 1985 81. 67 30.63 51.04
MW-4 26.5988 6. 50 30.63 -24 .13
*MW-9 19 . 0031 62 . 63 30.63 32.00
Kruskal-Wallace Test
P^oort Printed: 03-13-1995 16:01
Facility:WCWD Weld County Waste Disposal
Address:5019 WCR 35
City:Fort Lupton ST:CO Zip:80621
County:WELD
Contact:Howard Duckworth
Phone: (210) 525-1940
Permit Type:Detection
Constituent pH pH
„..CAS:Number
MCL: 0. 000 ppb
ACL: 0. 000 ppb
Detect Limit: 0. 000 ppb
Start Date:Aug 13 1990
End Date:Dec 27 1994
r
L a.Mode Or .g}nal
Background Wells
Well ID N %ND Max Value Min Value Mean Std Dev
MW-1 17 0 8.20 7. 50 7.92 0. 18
MW-12 13 0 7.90 7. 40 7. 56 0. 15
MW-13 15 0 8. 00 7. 00 7.50 0. 25
Compliance Wells
Well Ib N %ND Max Value Min Value Mean Std Dev
MW-5 13 0 7.40 6. 40 6.78 0. 28
MW-8 17 0 7.70 6. 60 7. 14 0. 35
MW-4 6 0 8 .00 7. 60 7.75 0. 16
MW-9 15 0 7 .60 7 .40 7.48 0. 09
H Statistic: 50.7796
H Adjusted for Ties: 51.3318
Degrees of Freedom: 4
Chi-Squared: 9.4878
Za/DF: 2 . 2414
* Indicates significant evidence of contamination
Well ID Crit. Diff. Rank Avg. Background Rank Avg. Difference
AT-5 19 . 6602 11. 42 64.22 -52 .80
-8 17 .7753 28. 65 64.22 -35.58
m4-4 27. 1365 73 .08 64.22 8.86
MW-9 18. 6155 46. 13 64.22 -18.09
7.--
1--,,
Kruskal-WallaceTest
� mort Printed: 03-13-1995 15: 00
Facility:WCWD Weld County Waste Disposal
Address:5019 WCR 35
City:Fort Lupton ST:CO Zip:80621
County:WELD
Contact:Howard Duckworth
Phone: (210) 525-1940
Permit Type:Detection
Constituent:Hardness Hardness ?
CAS Number
MCL: 0.000 ppb
ACL: 0.000 ppb
Detect Limit: 50000.000 ppb
Start Date:Aug 13 1990
End Date:Dec 27 1994
Data Mode 'Original
Background Wells
Well ID N'! %ND Max Value Min Value Mean Std Dev
MW-1 18 0 320000. 00 140000. 00 271666. 66 45146.82
MW-12 14 0 700000. 00 440000. 00 576428. 63 82332 . 09
MW-13 16 0 250000. 00 110000.00 151250. 00 42875. 79
Compliance Wells
Well' TO N %ND Max Value Min Value Mean Std' Dev
MW-5 13 0 4500000.00 220000. 00 2433846.00 1445651.75
MW-8 18 0 2100000. 00 150000. 00 636111. 13 518313 .31
MW-4 7 0 430000. 00 330000.00 378571.44 35790.39
MW-9 16 0 3600000.00 220000. 00 2758125. 00 804439. 44
H Statistic: 55. 4977
H Adjusted for Ties: 55. 5212
Degrees of Freedom: 4
Chi-Squared: 9. 4878
Za/DF: 2 .2414
* Indicates significant evidence of contamination
Well ID Crit. Diff. Rank Avg. Background Rank Avg. Difference
5 20.7299 82 . 35 32 . 19 50. 16
-8 18 .3248 53 . 58 32 . 19 21.40
rig-4 26. 8248 44.79 32.19 12. 60
*MW-9 19 . 1396 84.97 32.19 52 .78
Kruskal-Wallace Test
Yom`ort Printed: 03-13-1995 15: 04
Facility:WCWD Weld County Waste Disposal
Address: 5019 WCR 35
City:Fort Lupton ST:CO Zip:80621
County:WELD
Contact:Howard Duckworth
Phone: (210) 525-1940
Permit Type:Detection
Constituent:Ca Calcium, total
CAS Number: 7440-70-2
MCL: 0.000 ppb
ACL: 0.000 ppb
Detect Limit: 1000000. 000 ppb
Start Date:Aug 13 1990
End Date:Dec 27 1994
Daca Mode.Original'
Background Wells
Well ID N %ND Max Value Min Value Mean Std'Dev
MW-1 17 0 200000.00 74000. 00 161411.77 33598.84
MW-12 14 0 470000.00 130000. 00 378571.44 86278. 37
MW-13 16 0 170000.00 31000. 00 105187.50 34021.98
Compliance Wells
Well ID N %ND Max Value Min Value Mean Std Dev
MW-5 13 0 3200000.00 170000. 00 1834615.50 1071040. 13
MW-8 18 0 1400000.00 58000. 00 448777.78 353181.94
MW-4 6 0 310000.00 240000. 00 276666.66 30110.91
MW-9 16 0 1700000.00 650000. 00 1274375.00 263893 . 13
H Statistic: 60.9423
H Adjusted for Ties: 60.9712
,Qegrees of Freedom: 4
Chi-Squared: 9.4878
Za/DF: 2 .2414
* Indicates significant evidence of contamination
Well ID Crit. Diff. Rank Avg. Background Rank Avg. Difference
*AW-5 20. 3692 84. 19 30.26 53 .94
4 -8 18 . 0173 52 .50 30.26 22.24
kW-4 28 . 1794 43 .42 30. 26 13 . 16
*MW-9 18. 8139 83 . 00 30.26 52 .74
•
Kruskal-Wallace Test
+ port Printed: 03-13-1995 15:09
Facility:WCWD Weld County Waste Disposal
Address:5019 WCR 35
City:Fort Lupton ST:CO Zip:80621
County:WELD
Contact:Howard Duckworth
Phone: (210) 525-1940
Permit Type:Detection
Constituent Mg Magnesium, total
CAS Number 7439 95-4
MCL: 125000. 000 ppb
ACL: 0. 000 ppb
Detect Limit: 1000.000 ppb
Start Date:Aug 13 1990
End Date:Dec 27 1994
Data iMode Original
Background Wells
Well ID N %ND Max Value Min Value Mean Std Dev
MW-1 17 0 32000. 00 22000.00 27000.00 2828 .43
MW-12 14 0 63000. 00 35000. 00 44571. 43 8829 . 27
MW-13 16 0 19000. 00 7000.00 10556.25 3576. 40
Compliance Wells
Well ID N IND Max Value Min Value Mean Std` Dev
MW-5 13 0 320000. 00 7300.00 140176.92 99800.58
MW-8 18 0 170000. 00 7000. 00 43277.78 42140. 95
MW-4 6 0 32000. 00 23000. 00 25666. 67 3386. 25
MW-9 16 0 460000. 00 49000.00 334312.50 107257 .76
H Statistic: 49 . 4249
H Adjusted for Ties: 49.5015
Degrees of Freedom: 4
Chi-Squared: 9. 4878
Za/DF: 2 .2414
* Indicates significant evidence of contamination
Well ID Crit. Diff. Rank Avg. Background Rank Avg. Difference
*t -5 20. 3692 68. 12 36.59 31.53
•8 18 . 0173 43.31 36.59 6.72
Mw-4 28 . 1794 35.17 36.59 -1.42
*MW-9 18 . 8139 90. 91 36.59 54 . 32
Kruskal-Wallace Test
^port Printed: 03-13-1995 15: 12
Facility:WCWD Weld County Waste Disposal
Address: 5019 WCR 35
City:Fort Lupton ST:CO Zip:80621
County:WELD
Contact:Howard Duckworth
Phone: (210) 525-1940
Permit Type:Detection
Constituent CaCO3 Alkalinity (calcium carbonate)
CAS Number: 1317-05-3
MCL: 0.000 ppb
ACL: 0.000 ppb
Detect Limit: 0. 000 ppb
Start Date:Aug 13 1990
End Date:Dec 27 1994
Daca Mode Original
Background Wells
Well ID N %ND Max Value Min Value Mean StdsDev
MW-1 16 0 250000. 00 190000.00 228749.98 15438. 05
MW-12 14 0 410000.00 310000.00 345000.00 30064 . 04
MW-13 16 0 650000. 00 440000.00 558125. 00 60246. 02
Compliance Wells
Well ID N %ND Max Value Min Value Mean Std: Dev
MW-5 13 0 2700000. 00 510000.00 864615. 38 562548. 00
MW-8 18 0 1100000. 00 290000. 00 563333 .31 263684. 31
MW-4 7 0 180000. 00 160000.00 165714.28 7867.96
MW-9 16 0 320000. 00 2310.00 215769. 38 69858 . 22
H Statistic: 60.9223
H Adjusted for Ties: 60.9915
Degrees of Freedom: 4
Chi-Squared: 9.4878
Za/DF: 2 . 2414
* Indicates significant evidence of contamination
Well ID Crit. Diff. Rank Avg. Background Rank Avg. Difference
„..WW-5 20. 4171 88 . 69 49 . 29 39 . 40
W-8 18. 0714 68 . 19 49 .29 18 . 90
.4W-4 26. 3711 5. 14 49.29 -44 . 15
MW-9 18.8658 22 .88 49.29 -26.42
Y
Kruskal-Wallace Test
Port Printed: 03-13-1995 15: 15
Facility:WCWD Weld County Waste Disposal
Address:5019 WCR 35
City:Fort Lupton ST:CO Zip:80621
County:WELD
Contact:Howard Duckworth
Phone: (210) 525-1940
Permit Type:Detection
......................................
Constituent:K Potassium, total
CAS Number: 7440-09-7
MCL: 0. 000 ppb
ACL: 0.000 ppb
Detect Limit: 0.000 ppb
Start Date:Aug 13 1990
End Date:Dec 27 1994
Da..aMode:Original
Background Wells
Well ID N %ND Max Value Min Value Mean Std Dev
MW-1 16 6 44000. 00 2500. 00 7531.25 9895. 23
MW-12 14 0 330000. 00 19000.00 46785.71 81648 . 57
MW-13 15 0 280000. 00 65000.00 158333.33 46967 . 57
Compliance Wells
...................... ..
Well ID N %ND Max Value Min•Value Mean std rDev
MW-5 13 0 7400000. 00 200000.00 943076.94 1945368 . 00
MW-8 18 0 1200000. 00 190000.00 451666. 69 242226. 19
MW-4 6 0 22000. 00 2000. 00 6166. 67 7782 .46
MW-9 16 6 180000. 00 2500. 00 24281.25 41833 .79
H Statistic: 65. 9350
H Adjusted for Ties: 65.9821
Degrees of Freedom: 4
Chi-Squared: 9 .4878
Za/DF: 2 . 2414
* Indicates significant evidence of contamination
Well ID Crit. Diff. Rank Avg. Background Rank Avg. Difference
*MW-5 20. 0614 82 . 42 38.97 43 . 46
7-8 17.7686 82 . 33 38.97 43. 37
..A-4 27. 6904 12 . 08 38.97 -26.88
MW-9 18 . 5449 29.47 38.97 -9. 50
Kruskal-Wallace Test
- Thport Printed: 03-13-1995 15: 18
Facility:WCWD Weld County Waste Disposal
Address:5019 WCR 35
City:Fort Lupton ST:CO Zip:80621
County:WELD
Contact:Howard Duckworth
Phone: (210) 525-1940
Permit Type:Detection
Constituent:Fe Iron, total
CAS Number: 7439-8976
..:..... .......:._.,::,::
MCL: 30000.000 ppb
ACL: 0. 000 ppb
Detect Limit: 100000. 000 ppb
Start Date:Aug 13 1990
End Date:Dec 27 1994
L ca ModeOriginal
Background Wells
Well ID N %ND Max Value Min Value
Dev
MW-1 17 0 Mean. 6 S100.24
400. 00 20. 00 117. 06 100.24
MW-12 14 0 580. 00 30. 00 144 . 29
MW-13 16 0 11000. 00 761. 64
50. 00 1952 . 50 2761. 64
Compliance Wells
:Hall-ID N %ND Max Value Min Value
MW-5 13 0 4200. 00 300.00Mean 1047.02
MW-8 18 0 250000. 00 1581. 54 0429.92
MW-4 550. 00 45436. 11 60429.92
7 0 1900. 00 40. 00 578 . 57 661.88
MW-9 16 0 2200. 00 80. 00 440. 63 518 .85
H Statistic: 52 . 4642
H Adjusted for Ties: 52 .4881
Degrees of Freedom: 4
's, Chi-Squared: 9.4878
Za/DF: 2.2414
* Indicates significant evidence of contamination
Well ID Crit. Diff. Rank Avg. Background Rank Avg. Difference
*MW-5 20. 5740 68.46 34 . 51 33 . 95
*MW-8 18. 1985 89 .92 34.51 55. 41
lad-4 26. 5988 42.79 34.51 8. 28
.-9 19 . 0031 45. 06 34.51 10.55
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