WA-240_6433_G_O_20190212_MANNKENDALL

Evaluation Date:Job ID:
Facility Name: Constituent:
Conducted By: Concentration Units:ug/L
Sampling Point ID:MW-11R (Bz)MW-12 (Bz)MW-11R (MTBE)MW-12 (MTBE)
Sampling Sampling
Event Date
1 9-Dec-13 15700 521 37600 78.7
2 6-Jun-14 5760 62.1 8860 28.7
3 17-Jul-15 19 47 72.5 457
4 5-Feb-16 16.7 312 282 2.6
5 21-Nov-16 0.42 21 209 12.3
6 3-Jul-17 0.18 0.56 116 6.2
7 9-Mar-18 6.3 23.2 869 12.7
8 23-Jan-19 1.1 12.8 60 6.5
9
10
11
12
13
14
15
16
17
18
19
20
Coefficient of Variation:2.09 1.52 2.18 2.07
Mann-Kendall Statistic (S):-20 -18 -14 -10
Confidence Factor:99.3% 98.4% 94.6% 86.2%
Concentration Trend:Decreasing Decreasing Prob. Decreasing No Trend
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.
* - Yellow Highlight = ND sample modeled at MDL
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limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
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BENZENE / MTBE CONCENTRATION (ug/L)
February 12, 2019
Turnage Tripps Benzene / MTBE
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
Carrie Stone / J M Edwards
6433
0.1
1
10
100
1000
10000
100000
08/13 12/14 05/16 09/17 02/19 06/20Concentration (ug/L)Sampling Date
MW-11R (Bz)
MW-12 (Bz)
MW-11R (MTBE)
MW-12 (MTBE)