WA-1121_13273_G_O_20190314_MANNKENDALL

Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:MW-1 MW-5 MW-14 MW-15 MW-16R OW-5
Sampling Sampling
Event Date
1 3/7/2007 2840 11200 16900 11300
2 8/9/2007 12900
3 9/23/2009 1850 4940 7020 6400 105
4 8/12/2010 754 2120 4430 2500 95.4
5 9/7/2012 510 3540 6700 1340 395
6 8/22/2013 1160 3620 6150 1200 202 4240
7 3/3/2016 843 2840 5600 125 201 4310
8 2/28/2017 1200 5410 1780
9 10/31/2017 27.7 567 2350 767
10 9/10/2018 141 1280 4920 166 1110
11 2/18/2019 197 5310 6.8 767
12 3/4/2019 5200
13
14
15
16
17
18
19
20
Coefficient of Variation:0.99 0.92 0.58 1.26 0.60 0.78
Mann-Kendall Statistic (S):-22 -24 -31 -32 2 -10Confidence Factor:98.8%99.4%99.2%>99.9%59.2%95.2%
Concentration Trend:Decreasing Decreasing Decreasing Decreasing No Trend Decreasing
Notes:
1.At least four independent sampling events per well are required for calculating the trend. Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
* -Sampling on 2/18/19 appears to have transposed MW-14 & MW-15. Here #'s are swapped for modeling purposes <JME>.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
GSI Environmental Inc., www.gsi-net.com
BENZENE CONCENTRATION (ug/L)
March 18, 2019
Hak's Store Benzene
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
J.M. Edwards
13273
1
10
100
1000
10000
100000
05/05 10/06 02/08 07/09 11/10 04/12 08/13 12/14 05/16 09/17 02/19 06/20Concentration (ug/L)Sampling Date
MW-1
MW-5
MW-14
MW-15
MW-16R
OW-5
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:MW-1 MW-5 MW-14 MW-15 MW-16R MW-29 MW-39
Sampling Sampling
Event Date
1 3/7/2007 8.47 2010 2210 4850
2 8/9/2007 3690 5120
3 9/23/2009 62.5 1220 615 3050 214 2570 1050
4 8/12/2010 25 266 995 2590 517 1250 2770
5 9/7/2012 65 1060 837 780 495 253 2490
6 8/22/2013 26.4 761 1710 574 99.4 224 3370
7 3/3/2016 63 981 2090 111 129 127 1550
8 2/28/2017 187 458 1060
9 10/31/2017 25 281 239 196
10 9/10/2018 31 367 263 49.8 82.8
11 2/18/2019 63 848 12.4
12 3/4/2019 1300
13
14
15
16
17
18
19
20
Coefficient of Variation:0.54 0.75 0.66 1.05 0.69 1.24 0.77
Mann-Kendall Statistic (S):10 -18 -11 -36 -4 -15 -14Confidence Factor:82.1%96.2%77.7%>99.9%75.8%99.9%94.6%
Concentration Trend:No Trend Decreasing Stable Decreasing Stable Decreasing Prob. Decreasing
Notes:
1.At least four independent sampling events per well are required for calculating the trend. Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
* -Sampling on 2/18/19 appears to have transposed MW-14 & MW-15. Here #'s are swapped for modeling purposes <JME>.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
MTBE CONCENTRATION (ug/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
March 18, 2019 13273
Hak's Store MTBE
J.M. Edwards
1
10
100
1000
10000
05/05 10/06 02/08 07/09 11/10 04/12 08/13 12/14 05/16 09/17 02/19 06/20Concentration (ug/L)Sampling Date
MW-1
MW-5
MW-14
MW-15
MW-16R
MW-29
MW-39
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:MW-1 MW-5 MW-14 MW-15 MW-16R MW-29 MW-39
Sampling Sampling
Event Date
1 3/7/2007 91765.29 83153.8 106017.3 74609.31
2 8/9/2007 73198 5178.59
3 9/23/2009 87649 66060 75549 44192.7 566.681 2640.71 1848.92
4 8/12/2010 46903 30221 37458.4 19567 833.9 1287.16 3228.58
5 9/7/2012 65915.7 51350 75295 16494.5 2464.5 258.85 2634.6
6 8/22/2013 65682.7 46204 66558.1 18762.7 1076.93 241.8 3595
7 3/3/2016 71862.1 50965.1 63864.6 766.8 1061.69 131.09 1572
8 2/28/2017 43242.2 57318 1080.5
9 10/31/2017 37127 37469.4 34688.26 258
10 9/10/2018 57644.9 59270.2 82984 5924.1 160.09
11 2/18/2019 51688 72763 174
12 3/4/2019 60770
13
14
15
16
17
18
19
20
Coefficient of Variation:0.28 0.31 0.30 1.03 0.61 1.23 0.72
Mann-Kendall Statistic (S):-18 -12 -17 -32 4 -15 -18Confidence Factor:96.2%87.0%89.1%>99.9%75.8%99.9%98.4%
Concentration Trend:Decreasing Stable Stable Decreasing No Trend Decreasing Decreasing
Notes:
1.At least four independent sampling events per well are required for calculating the trend. Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
* -Sampling on 2/18/19 appears to have transposed MW-14 & MW-15. Here #'s are swapped for modeling purposes <JME>.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
15 PRIMARY COCS CONCENTRATION (ug/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
March 18, 2019 13273
Hak's Store 15 Primary COCs
J.M. Edwards
1
10
100
1000
10000
100000
1000000
05/05 10/06 02/08 07/09 11/10 04/12 08/13 12/14 05/16 09/17 02/19 06/20Concentration (ug/L)Sampling Date
MW-1
MW-5
MW-14
MW-15
MW-16R
MW-29
MW-39