WA-802_11085_CA_O_20201008_MANNKENDAL

Evaluation Date:Job ID:
Facility Name: Constituent:
Conducted By: Concentration Units:ug\l
Sampling Point ID:MW 3 MW 17 MW 10 2L
Sampling Sampling
Event Date
1 23-Feb-10 1440 1280 1
2 17-Aug-10 2330 292 1
3 2-Mar-11 741 340 1
4 27-Jan-12 132 714 1
5 5-Dec-12 5800 1760 334 1
6 25-Jul-13 503 884 304 1
7 8-May-14 348 1610 633 1
8 28-Oct-14 832 614 442 1
9 5-May-15 243 4040 727 1
10 6-Feb-17 250 3910 744 1
11 13-Feb-18 1590 2880 786 1
12 4-Sep-18 949 91.3 470 1
13 22-Jul-19 1940 253 48.7 1
14 9-Sep-20 145 125 244 1
15
16
17
18
19
20
Coefficient of Variation:1.21 0.94 0.59 0.00Mann-Kendall Statistic (S):-11 -15 -5 0
Confidence Factor:70.5% 89.2% 58.5% 47.8%
Concentration Trend:No Trend Stable Stable Stable
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.
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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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GSI Environmental Inc., www.gsi-net.com
BENZENE CONCENTRATION (ug\l)
8-Oct-20
Grannys Grill Benzene
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
CJW
11085
1
10
100
1000
10000
07/09 11/10 04/12 08/13 12/14 05/16 09/17 02/19 06/20 10/21Concentration (ug\l)Sampling Date
MW 3
MW 17
MW 10
2L