correlation & association analyses for soil gas … › work › 03 › 2065657.pdfmyers, 1993)....

UNITED STATES ENVIRONMENTAL PROTECTION AGENCYNATIONAL EXPOSURE RESEARCH LABORATORY

P.O. BOX 93478 • LAS VEGAS, NV 89193-3478

FEE - 5 2003

SDMS DocID2065657

OFFICE OFRESEARCH AND DEVELOPMENT

MEMORANDUM

SUBJECT:

FROM:

TO:

Valmont TCE Superfund Site .t f t* ' / ,' -f •- 1

/ ;-/y.. .. y^/; /"V&'j£v-~r^^J. Gareth Pearson, Acting Director, --s. ?-&-'£. J-1 •• ••*/<-**•Technology Support Center for Monitoring and Site Characterization,National Exposure Research Laboratory,Environmental Sciences Division, Las Vegas

Rom Roman, RPMUSEPA Region III

Rom, attached is the report titled "Correlation and Association Analyses for Soil GasVersus Basement Air: Round 2 (PADEP) Data, Soil Gas Versus Basement Air: Round 3 (EPA)Data, First Floor Versus Basement Air: Round 3 (EPA) Data, Valmont TCE Site, West Hazelton,Luzeme County, Pennsylvania" dated February 4th, 2003. This report was prepared by Dr. AnitaSingh a Lockheed Martin senior scientist.

Also enclosed is a Customer Feedback Form which we are asking you to complete andfax back to us. Your input would be appreciated.

If you have any questions, please contact me at (702) 798-2101.

cc: Jennifer Hubbard, Region 3

Attachments

Recycled/Recyclable • Printed with Vegetable Oil Based Inks on 100% Recycled Paper (40% Postconsumer)

Correlation and Association Analyses forSoil Gas Versus Basement Air: Round 2 (PADEP) Data FEE - jji

Soil Gas Versus Basement Air: Round 3 (EPA) DataFirst Floor Versus Basement Air: Round 3 (EPA) Data

Valmont TCE Site, West Hazleton, Luzerne County, Pennsylvania

At the request of Mr. R. Roman, RPM, Region 3, Mr. N. Teamerson of Tetra Tech NUS(TtNUS) provided three rounds of sampled data for soil gas, basement air, and first floor air for theValmont TCE Superfund Site. The main objective of this request is to determine if there are anysignificant correlations between soil gas and indoor air (basement and first floor) contaminantconcentrations. It is observed that during the first round (June 2001), only basement air sampleswere collected. Therefore, the first round data were not included in the correlation analyses assummarized in this report. Round 2 data from basement (November, 2001) and soil gas (October,2001) were collected by the Pennsylvania Department of Environmental Protection (PADEP).Round 2 soil gas data were collected from depths up to 3 feet. During round 2, data were collectedonly from seven (7) residences. Round 3 first floor air (February 2002) and basement air (February2002) data, and EPA soil gas (August 2002) data were collected by USEPA. The first floor airsamples were collected only during round 3 (EPA, February 2002). Round 3 soil gas (EPA, August2002) data were collected from depths up to 10 feet. This makes the round 2 and round 3 soil gasdata sets incompatible. Also, the analytical methods used during rounds 2 and 3 are different withvarying detection limits. It is observed that the field method as used by EPA during round 3 resultedin much higher detection limits as compared to the laboratory method used by PADEP during round2. All non-detects have been replaced by '0' (as suggested by Ms Hubbard) in the correlationanalyses as summarized in this report. Correlation analyses have been conducted individually forround 2 and round 3 data sets. Even though round 2 and round 3 data are not compatible, correlationand association analyses (basement versus soil gas) have also been conducted on the combined round2 (PADEP) and round 3 (EPA) data sets.

The correlation analysis was conducted for the following 14 contaminants as identified byMs Jennifer Hubbard. EPA Region 3 on 1-28-03 (e-mail). For round 2, the associated data files arelabeled as R2-C01.XLS, R2-C02.XLS, ..., R2-C14.XLS. The files for round 3 air (first floor airversus basement air samples, R3-C01, R3-C02, etc.) and EPA soil gas (round 3 basement air versussoil gas samples, EPA-C01, EPA-CO2 etc.) have been labeled similarly. The combined (soil gasversus basement air data from round 2 and round 3) data sets have been labeled as COM-C01, COM-C02 etc. Round 2 analyses are based on a data set of size 7 (7 residences). Round 3 basement versussoil gas analyses are based upon a data set of size-16 (16 residences). Round 3 first floor versusbasement analyses are based upon a data set of size 26 (26 residences). The results of these analysesare given in Appendices A1-A4. This information is summarized in the following table.

Round 2PADEP

Round 3EPA

Soil Gas

Oct 20013 feet7 homes

Aug 200210 feet16 homes

Basement

Nov 20017 homes

Feb 200226 homes

First Floor

Not Analyzed

Feb 200226 homes

For convenience, the 14 contaminants have been coded C01 through C14. These codes are given asfollows.

Contaminant

1,1,1-Trichloroethane1,1-Dichloroethene1,2,4-Trimethylbenzene1,3-ButadieneBenzene (+ 1,2-DCA for EPA soil gas)Carbon TetrachlorideChloroformDichlorodifluoromethane (Freon 12)Styrene (+ o-Xylene for EPA soil gas)TetrachloroetheneTolueneTrichloroetheneTrichlorofluoromethane (Freon 11)Vinyl Chloride

Designation

1,1,1 TCA1,,1 DCE

Benzene

StyrenePCE

TCE

Code

C01C02COSC04COSC06C07C08C09C10C11C12C13C14

This letter report summarizes the correlation and association (using non-detects versus detects data)analyses results for the 14 contaminants listed above. The statistical software MINITAB has beenused to conduct the correlation analyses. Chi-square tests have been performed using the EXCELcalculator. These analyses have been conducted for the following combinations of data sets.

Soil Gas (August 2002) versus Basement Data (February 2002): Round 3 EPA Data - Resultssummarized in Appendix Al.

Soil Gas (October 2001) versus Basement (November 2001) Data: Round 2 PADEP Data-Results summarized in Appendix A2.

Basement (February 2002) Air and First Floor (February 2002) Air: Round 3 EPA Data -Results summarized in Appendix A3

Soil Gas versus Basement Air Data: Combined PADEP(Round 2) and EPA (Round 3) Data -Results summarized in Appendix A4

The majority of data sets provided by TtNUS consist of many non-detects. In the correlationanalyses as summarized in this report, all non-detects were replaced by '0' as suggested by Ms J.Hubbard. Since, the correlation analyses conducted on data sets with many '0' could be misleading,non-parametric, Chi-square 2 by 2 contingency table tests were also performed to test theindependence of soil gas and basement samples (and also of first floor and basement air samples).Soil gas, first floor, and basement concentrations were. categorized in two categories: Detectedobservations (D) versus Non-detected observations (N). The independence (or association) betweensoil gas versus basement air concentrations (and also first floor air versus basement air) is measuredin terms of detects (D) and non-detects(N) using Chi-square contingency table tests (Walpole andMyers, 1993). The resulting test statistic follows a Chi-square distribution with 1 degree of freedom(df). The associated 5% critical value of a Chi-square test-statistic with 1 degree of freedom is 3.84.If a calculated Chi-square value (based upon the data) exceeds 3.84, the association between twofactors (e.g., Soil Gas versus Basement) can be considered significant. Otherwise it is consideredinsignificant. The results of the Chi-square tests are summarized in Table 1.

A couple of contingency table examples with the calculated Chi-square values are given asfollows. In Example 1, the Chi-square value is insignificant and in Example 2, the Chi-square valueis significant. Therefore,, based upon EPA round 3 data, no significant association exists in TCEconcentrations found in soil gas and basement samples. However, for 1,1,1- TCA, the associationbetween first floor air and basement air concentrations can be considered significant. The rest of theresults are summarized in Table 1.

Example 1: Round 3 EPA Soil Gas Versus Basement Data for TCE

GhKSquare =i : (D.T52381;; : . ! :! •; • ' ! ' • - • • ' • ; ' : i " - D : . :

' I • • ! ' ' ' N

• o :: 1 :

"5 :6

N. 1

910

214

.16

Example 2. Round 3 First Floor versus Basement data for 1,1,1-Trichloroethane

: :Ctii-Square =f 7;8253279! : ;; v. : r i •.' - - - : ; " ' i.' : ': .-: -- : '!•:•• ' . ' ; : < • • . ' ' ' '•• '• - '. .;- >.- ' • - - - ' '- ••

. • • ' - • ' . " • - ' - : • ! • : • • ' . ' • • . • - •1 ; : ; - : - : " • ' ". •- : - • : • ; • • - • : . - - : • . . ' - '•'. ' - - - - ' | - - -: : - :

• ' ' - ;{ . " : • ' " - - ) - ' ' • ' - . ' - • . • s - ' . . • •. ;. r . . . • --1 . : • j •

r - :Pf- : [

;.-hNv;,::

::;";:.D:;,-'-:.- iB-:--: ; - ; 2 : - : ; ;

:. 8 •

'-••• N : ^

: - 2 : •> .;-1B :

18

: : =*-: . 18 .

26

Table 1.

Calculated Chi-Square Values

1,1,1-Trichloroethane - C01

1,1-Dichloroethene 7 C02

1 ,2,4-Trimethylbenzene - COS

1 ,3-Butadiene - C04

Benzene - COS

Carbon Tetrachloride - C06

Chloroform - C07

Dichlorodifluoromethane (Freon 12)-C08

Styrene (+ o-Xylene for EPA soil gas)-C09

Tetrachloroethene (PCE) - CIO

Toluene- C11

Trichloroethene (TCE) - C12

Trichlorofluoromethane (Freon 11)-C13

Vinyl Chloride -C1 4

Round 2Soil Gas VsBasementPADEP

1.2152778

N/A1

0.2625000

0.0243056

0.2625000

N/A1

0.2625000

N/A2

1.1812500

N/A1

0.2625000

N/A1

1.2152778

• N/A3

Round 3Soil Gas

VsBasement

EPA

1.6410256

N/A4

N/A1

N/A5

0.0711111

N/A4

1.3714286

0.3555556

3.4844444

0.1745455

0.0711111

0.1523810

N/A1

N/A4

CombinedRound 2 &

RoundSSoil Gas VsBasement

1.4417032

1.2589015

0.0882675

0.0243056

0.6482233

0.4907828

0.1587827

1.0598410

0.3271091

0.0065341

0.0924107

0.3271091

0.3271091

N/A4

Round 3First Floor

VsBasement

7.8253279

N/A3

10.275376

N/A5

2.6216667

N/A3

3.2906250

7.4295094

0.9572727

1 .5072464 '

N/A2

N/A6

9.1660156

N/A3

1. All Soil Gas Observations were at non-detect levels.2. All Observations (both.variables) were at detectable levels.3. No Observations (both variables) were at detectable levels.4. All Basement Observations were at non-detect levels.5. No applicable data available6. All First Floor Observations were at non-detects levels

From the results as summarized in Figures 1-13, in appendices A1-A4. and in Table 1, the followingobservations have been made:

No significant Pearson correlations were observed between basement air and soil gas round3 EPA samples (Appendix Al). Therefore, graphs for EPA round 3 soil gas versus basementdata were not provided.

Further more, all of the non-parametric Chi-square tests (Table 1) based upon these round 3EPA (soil gas versus basement air) data sets either could not be computed or wereinsignificant (as all are calculated Chi-square values are less than the critical value of 3.84)at .0.05 level of significance.

Therefore, it is concluded that ho significant correlations or associations exist between EPAsoil gas and basement air concentrations using round 3 data sets.

• .No significant Pearson correlations (Appendix A4) were observed between basement air andsoil gas samples based upon the combined PADEP (round 2) and EPA (round 3) data sets.Therefore, graphs for the combined data set are not provided.

Also, all of the non-parametric Chi-square tests (Table 1) based upon the combined PADEPround 2 data set and round 3 EPA (soil gas versus basement air) data set either could not becomputed or were insignificant (as all are <the critical value of 3.84) at 0.05 level ofsignificance.

Therefore, it is concluded that no significant correlations or associations exist between soilgas and basement air concentrations using the combined round 2 (PADEP) and round 3(EPA) data sets.

• Some significant correlations (at about 0.05 level of significance) were observed based upononly seven (7) data points (basement versus soil gas) for round 2 PADEP sampling(AppendixA2). These are for contaminant R2-C01 (1,1,1-Trichloroethane), R2-C03 (1,2,4-Trimethylbenzene), R2-C04 (1, 3-Butadiene), R2-C09 (Styrene (+ o-Xylene for EPA soilgas)), and R2-C11 -Toluene (borderline). Since these correlations arebased upon limited datasets (only 7 points with non-detects), these can not be considered reliable representing the realsituation at the Valmont TCE Site. Furthermore, it is noted that the most of these correlationsappear (e.g., see Figure 1) to be driven by two points (note that correlation between two points=1). This can be seen in Figures 1-5. Therefore, Chi-square tests were conducted on thesedata sets.

It is noted that all of the non-parametric Chi-square tests (Table 1) based upon the round 2PADEP data set either could not be computed or were insignificant at 0.05 level ofsignificance.

Therefore, based upon Round 2 PADEP data set, it is concluded that no significant

6

correlations or associations exist between basement air and soil gas concentrations for the14 contaminants considered.

Finally, the correlation analyses were conducted for Round 3 first floor air and basement airfor thel4 contaminants listed above(Appendix A3). There appear to be some significantcorrelations (Appendix A3) for contaminants: R3-C01 (1,1,1-Trichloroethane), R3-C03(1,2,4-Trimethylbenzene), R3-C05(Benzene), R3-C07(Chloroform), R3-C08(Dichlorodifluoromethane (Freon 12)), R3-C09(Styrene (+ o-Xylene for EPA soil gas)),R3-C11 (Toluene), and R-C13 (Trichlorofluoromethane (Freon 11)). First floor versusbasement air concentration graphs for these contaminants are given in Figures 6-13.

Both correlation and association analyses suggest that there are positive correlations inbasement air and first floor air for 1,1,1-Trichloroethane and 1,2,4-Trimethylbenzeneconcentrations. Correlation analysis for benzene suggests that there is significant positivecorrelation in basement and first floor air as can also be seen in Figure 8. From Figure 9, itis concluded that correlation between basement air and first floor air Chloroform is inflatedby a couple of points and cannot be considered reliable. The associated non-parametric Chi-square test for Chloroform is insignificant at 0.05 level of significance. However, it shouldbe noted that Chloroform correlation and association between first floor and basement airbecomes significant at 0.1 level of significance.

Both Pearson correlation (Figure 10) and Chi- square test (Table 1) suggest that there issignificant positive correlation between first floor and basement Dichlorodifluoromethane(Freon 12) concentrations. From Figure 11, it is concluded that correlation between basementair and first floor air Styrene concentrations is inflated by a single point and cannot beconsidered reliable. The associated non-parametric Chi-square statistic for Styreneconcentrations is also insignificant at 0.05 level of significance. The correlation analysis forToluene (Figure 12) suggests that there is significant positive correlation between first floortoluene and basement toluene. Finally, the Chi-square test (Table 1) suggests that there issignificant association in first floor and basement C13-Trichlorofluoromethane (Freon 11)concentrations. There is an extreme outlier in Freon 11 data set (=137 first floor air). Thisoutlier distorted the Pearson correlation coefficient. The correlation without this outlier issignificant as can also be seen in Figure 13. Both correlation and association analyses suggestthat there is a positive correlation between basement air and first floor airTrichlorofluoromethane (Freon 11) concentrations.

Summary

Figure 5: R2-C11.XLS=Toluene

c.CD

CDW03CQ

100 —

90 —

80 —

70 —

60 —

50 —

40 —

30 —

20 —

10 —

0 —

Regression PlotBasement = 26.1355 + 3.88206 Soil Gas

S = 24.8848 R-Sq = 52.6 % R-Sq(adj) = 43.1 %

T5 10

Soil Gas

"T15

13

3 —

2 —

0)C/)03

CD

Figure 3: R2-C04.XLS=1,3-Butadiene

Regression PlotBasement = -0.358302 + 0.187559 Soil Gas

S = 0.801587 R-Sq = 67.6 % R-Sq(adj) = 61.1%

0 —

5 10

Soil Gas

i15

11

Figure 1: R2-C01.XLS=1,1,1-Trichloroethane

1500 —

^ 1000c(D

CDUDTO

500 —

0 —I

0.0

Regression PlotBasement = 5.32167 + 1358.80 Soil Gas

S = 7.00400 R-Sq = 100.0 % R-Sq(adj) = 100.0 %

0.5

Soil Gas1.0

It is observed that significant correlations and associations (at 0.05 level of significance) exist onlyin indoor basement air and first floor air concentrations. The following observations have been made:

Using the round 2 PADEP data set. it is observed that no significant correlations orassociations exist between basement air and soil gas concentrations for the 14 contaminantsconsidered. . .

Using the round 3 EPA data set, it is observed that no significant correlations or associationsexist between basement air and soil gas concentrations for the 14 contaminants considered.

Using the combined Round 2 and Round 3 data set, it is observed that no significantcorrelations or associations exist between basement air and soil gas concentrations for the 14contaminants considered.

• Significant (at 0.05 level of significance) positive correlations and associations have beenobserved between Round 3 first floor air and basement air concentrations for some of thecontaminants. These contaminants are 1,1,1-Trichloroethane, 1,2,4-Trimethylbenzene,Benzene, Dichlorodifluoromethane (Freon 12), Toluene, and Trichlorofluoromethane (Freon11). It is also noted that for Chloroform, the correlation and association between first floor airand basement air concentrations is insignificant at 0.05 level but becomes significant at 0.1level of significance.

References

Walpole, R.E. and Myers, R.H. (1993). Probability and Statistics for Engineers and Scientists. FifthEdition. Prentice Hall, NJ 07632.

Figure 7: R3-C03.XLS=1,2,4-Trimethylbenzene

50 —

40 —

O 30 —O

L20 —I

10 —

0 —

Regression PlotFirst Floor = 4.32711 + 0.388161 Basement

S = 10.7518 R-Sq = 29.8 % R-Sq(adj) = 26.7 %

i . i r i i i i10 20 30 40 50 60 70

Basement

15

4 —

O_gLJ_

ILL

2 —

«4

Figure 9: R3-C07.XLS=Chloroform


S = 1.22530 R-Sq = 14.2 % R-Sq(adj) = 10.6 %

0 —

0.0I I I

0.5 1.0 1.5

Basement

• i2.0 2.5

17

Figure 11: R3-C09.XLS=Styrene (+ o-Xylene for EPA Round 3 Samples)


S = 0.498778 R-Sq = 92.6 % R-Sq(adj) = 92.3 %

9 —

8 -

7 -

6 -O° 5

LJ_

3

2

1

0

0 1 2I

41 I I T6 7 8 9

Basement

Figure 12: R3-C11.XLS=Toluene

19

Figure 13: R3-C13.XLS=Trichlorofluoromethane (Freon 11)- without outlier (=137 first floor air)

20 —

OO

0 —


S = 2.90614 R-Sq = 83.6 % R-Sq(adj) = 82.9 %

10 20

Basement

T30

Appendices Al - A4

21

Correlations: Basement, Soil Gas

Pearson correlation of Basement and Soil Gas = -0.078P-Value = 0.773

Macro is running ... please wait

Regression Analysis: Basement versus Soil Gas

The regression equation isBasement = 60.0963 - 0.481616 Soil Gas

S = 75.5319 . R-Sq = 0.(

Ana-lysis of Variance

SourceRegressionErrorTotal

DF1

SS494.6

R-Sq(adj) = 0.0 %

MS F P494.58 8.67E-02 0.773

14 79870.9 5705.0615 80365.4

Fitted Line Plot: Basement versus Soil Gas

Retrieving worksheet from file: A:\EPA-C12.XLS

Results for: EPA-C12.XLS=Trichloroethene (TCE)






S = 782.724 R-Sq = 1.1 R-Sq(adj) = 0.0 %

Analysis of Variance

Source DF SS MS

25

The regression-equation isBasement = 24.7826 - 0.0359214 Soil Gas

S = 38.2379 R-Sq = 10.3 % R-Sq(adj) = 3.9 %



' DF1.

1415

SE2345.1

20469.-922815.0

MS2345.091462.14

F P1.60388 0.226



Results for: EPA-C10.XLS=Tetrachloroethene (PCE)



Macro is running . . . please wait



S = 0.498086 R-Sq = 0.5 % R-Sq(adj) = 0.0 %


Source DF SS MS F PRegression 1 0.01884 0.018843 7.60E-02 0.787Error 14 3.47325 0.248089Total 15 3.49209


Retrievina worksheet from file: A:\EPA-C11.XLS

Results for: EPA-C11.XLS=Toluene

24

Source . DF SS MS F PRegression 1 49.18S 49.1882 1.23474 0.285Error 14 557.716 39.8369Total . 15 606.904



Results for: EPA-C07.XLS=Chloroform



Macro is running . .•. please wait



S = 0.345486 R-Sq = 0.7 % R-Sq(adj) = 0.0 %


Source DF SS MS F PRegression 1 0.01232 0.012323 0.103239 0.753Error 14 ' 1.67105 0.119361Total 15 1.68337


Retrieving worksheet from file: A:\EPA-C09.XLS=Styrene (+ o-Xylene for EPA soil Gas)

Results for: EPA-C09.XLS=Styrene (+ o-Xylene for EPA soil Gas)





Appendix A1. Analysis of EPA Soil Gas Samples(Auqust 2002) and Round 3 EPA BasementData ( February 2002)


Results for: EPA-C01.XLS=1,1,1-Trichloroethane


Pearson correlation of Basement and Soil Gas = 0.036P-Value = 0.894



The regression equation isBasement = 5.17852 + 0.0023651 Soil Gas

S = 10.0197 R-Sq = 0.1 % R-Sq(adj) = 0.0 %





Results for: EPA-C05.XLS=Benzene






S = 6.31165 R-Sq = 8.1 % R-Sq(adj) = 1.5 %


22



Macro is. running ... please wait



S = 3.56938 R-Sq = 13.4 % R-Sq(adj) = 0.0 %


Source DF SS MS - • F - PRegression 1 9.8175 9.8175 0.770572 0.420Error 5 63.7025 12.7405Total 6 73.5200


Retrieving worksheet from file: A:\R2-C07.XLS=Chloroform

Results for: R2-C07.XLS=Chloroform





The regression equation isBasement = 2 - 1.53846 Soil Gas

S = 1.39714 R-Sq = 26.0 % R-Sq(adj) ='11.2 %


Source DF SS MS F PRegression 1 3.4286 3.42857 1.75644 0.242Error ' 5 9.7600 ' 1.95200Total 6' 13.1886

29

S = 4.08593 R-Sq = 70.5 % R-Sq(adj) = 64.6 %


Source DF SS MS F PRegression 1 199.234 . 199.234 11.9339 0.018Error 5 83.474 16.695Total 6 282.709


Retrieving worksheet from f i le : A:\R2-C04.XLS=1,3-Butadiene

Results for: R2-C04.XLS=1,3-Butadiene





The regression equation isBasement = -0.358302 + 0.187559 Soil Gas

S = 0.801587 R-Sq = 67.6 % R-Sq(adj) = 61.1 %


Source DF SS MS F PRegression 1 6.69586 6.69586 10.4209 0.023Error 5 3.21271 0.64254Total 6 9.90857


Retrieving worksheet from file: A:\R2-C05.XLS=Benzene

Results for: R2-C05.XLS=Benzene

28.

Retrieving worksheet from file: A: \R2-C01.XLS=1,L,1-Trichloroethane

Results for: R2-C01.XLS=1,1,1-Trichloroethane






S = 7.00400 R-Sq = 100.0 % R-Sq(adj) = 100.0 %


Source DF SS MS F P•Regression 1 1914911 1914911 39035.2 0.000Error 5 245 49Total •> 6 1915157


Retrieving worksheet from file: A:\R2-C03.XLS=1, 2 , 4-Trimethylbenzene

Results for: R2-C03.XLS=1,2,4-Trimethylbenzene





The regression equation isBasement = 6.36893 + 6.50485 -Soil Gas

27




S = 13.4299 R-Sq = 7.5 % R-Sq(adj) = 0.0 %


MS F P72.702 0.403093 0.553180.361



DF156

SS72.702901.806974.509

32




Retrieving worksheet from file: A:\R2-C11.XLS=Toluene

Results for: R2-C11.XLS=Toluene






S = 24.8848 R-Sq = 52.6 % R-Sq(adj) = 43.1 %




Retrieving worksheet from file: A:\R2-C13.XLS=Trichlorofluoromethane (Freon 11}

Results for: R2-C13.XLS=Trichlorofluoromethane (Freon 11)


Pearson correlation of Basement and Soil Gas = 0.273P-Value = 0.5E3

31


Retrieving worksheet from file: A:\R2-C08.XLS=Dichlorodifluoromethane (Freon 12}

Results for: R2-C08.XLS=Dichlorodifluoromethane (Freon 12)



Macro.is running ... please wait



S = 48.3526 R-Sq = 0.4 % R-Sq(adj) = 0.0 %




Retrieving worksheet from file: A:\R2-C09.XLS=Styrene (+ o-Xylene for EPA soil Gas)

Results for: R2-C09.XLS=Styrene (+ o-Xylene for EPA soil GAS)



Macro is running .,. . please-wait


The regression equation isEasement = 0.360409 + 1.39119 Soil Gas

S = 0.709693 R-Sq = 57.2 % R-Sq(adj) = 48.7 %

30

S = 5.58567 R-Sq = 74.2 % R-Sq(adj) = 73.1 %



Fitted Line Plot: First Floor versus Basement

Retrieving worksheet from file: A:\R3-C09.XLS=Styrene (+ o-Xylene for EPA soil Gas)

Results for: R3-C09.XLS=Styrene (+ o-Xylene for EPA soil Gas)

Correlations: Basement, First Floor

Pearson correlation of Easement and First Floor = 0.962P-Value = 0.000


Regression Analysis: First Floor versus Basement

The regression equation isFirst Floor = 0.1772 + 0.980311 Basement

S = 0.498778 R-Sq = 92.6 % R-Sq(adj) = 92.3 %


Source DF SS - MS F PRegression 1 74.8479 74.8479 300.861 0.000Error 24 5.9707 0.2488

Total 25 80.8186


Retrieving worksheet from file: A:\R3-C10.XLS=Tetrachloroethene (PCE)

Results for: R3-C10.XLS=Tetrachloroethene (PCE)'


Pearson correlation of Easement and First Floor = -0.061P-Value = 0.768'

36

Retrieving worksheet from file: A:\R3-C07.XLS=Chloroform

Results for: R3-C07.XLS=Chloroform


Pearson correlation of Easement and First Floor = 0.377P-Value = 0.058




S = 1.22530 R-Sq = 14.2 % R-Sq(adj) = 10.6 %




Retrieving worksheet from f i le : A: \R3-C08. X-LS=Dichlorodif luoromethane (Freon 12)

Results for: R3-C08.XLS=Dichlorodifluoromethane (Freon 12)


Pearson correlation of Basement and First Floor = 0.861P-Value = 0.000

Macro is running ...please wait


The regression equation is •First Floor = 0.801667 + 1.16672 Easement

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S = 10.7518 R-Sq = 29.8 % R-Sq(adj) = 26.7 %


Source DF SS MS F PRegression 1 1126.00 1126.00 9.74045 0.005Error 23 2658.81 115.60Total • 24 3784.82


Retrieving worksheet from file: A:\R3-C05.XLS=Benzene

Results for: R3-C05.XLS=Benzene






S = 6.46163 R-Sq =.35.8 % R-Sq(adj) = 33.1 %




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Appendix A3: ANALYSIS of ROUND 3 (R3) DATA: FIRST FLOOR AIR VERSUS BASEMENT AIRCONCENTRATIONS- BOTH COLLECTED IN FEBRUARY 2002 BY EPA

Retrieving'worksheet from file: A:\R3-C01.XLS=1,1,1-Trichloroethane

Results for: R3-C01.XLS=1,1,1-Trichloroethane






S = 3.12710 R-Sq = 39.9 % R-Sq(adj) = 37.4 %

Analysis .of Variance



Retrieving worksheet from file: A:\R3-C03.XLS=1,2,4-Trimethylbenzene

Results for: R3-C03.XLS=1,2,4-Trimethylbenzene





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Appendix A4 : ANALYSIS OF COMBINED DATA SET ROUND 2 AND EPA (ROUND 3) : BASEMENT VERSUS SOILGAS CONCENTRATIONS

Retrieving worksheet from file: A:.\COM-C01.XLS=1,1,1-Trichloroethane

Results for: COM-C01.XLS=1,1,1-Trichloroethane






S = 318.46,9 R-Sq = 0.4 % R-Sq(adj) = 0.0 %


Source DF SS MS F PRegression' 1 . 8731 8731 8.61E-02 0:772Error 21 2125879 101423Total 22 2138610


Retrieving worksheet from file: A:\COM-C02.XLS=1,1-Dichloroethene

Results for: COM-C02.XLS=1,1 -Dichloroethene


Pearson correlation of Basement and Soil Gas = -0.05SP-Value = 0.785



The rearession eauation is

First Floor = 4.97318 + 1.13687 Basement

S = 26.3505 R-Sq = 8.1 % R-Sq(adj) = 4.2 %


Source DF SS MS . F PRegression 1 ' 1458.9 1458.94 2.10116 0.160Error 24 16664.4 694.35Total 25 18123.3


Results for: R3-C13.XLS=Trichlorofluoromethane (Freon 11) - without the outlier (first floorair Freon 11 concentration =137 removed)

Outlier = 137 first floor air Freon 11 concentration distorted the Pearson correlationcoefficient. The analysis was repeated with out the outlier. The results are summarized asfollows.



S = 2.90614 R-Sq = 83.6 % R-Sq(adj) = 82.9 %


F 'P117.249 0.000


DF1

2324

SS990 .24194 .25

1184 .45

MS990 .2448.446


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Retrieving worksheet from file: A:\R3-C11.XLS=Toluene

Results for: R3-C11.XLS=Toluene






S = 37.7628 R-Sq =55.4 % R-Sq(adj) = 53.6 %


Source DF SS MS • F PRegression 1 42561.2 42561.2 29.8459 0.000Error . 24 34224.7 1426.0Total 25 76785.9


Retrieving worksheet from file: A:\R3-C13.XLS=Trichlorofluoromethane (Freon 11)

Results for: R3-C13.XLS=Trichlorofluoromethane (Freon 11)


Pearson correlation of Basement.and First Floor = 0.284P-Value = 0.160



\The regression equation is

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The regression equation isFirst Floor = 0.4592 - 0.237927 Basement

S = 1.50637 R-Sq = 0.4 % R-Sq(adj) = 0.0 %


Source DF ' SS MS F PRegression 1 0.2028 0.20275 8.94E-02 0.768Error 24 54.4598 2.26916Total 25 54.6625


Welcome to Minitab, press Fl for help.Retrieving worksheet from file: A:\R3-C10.XLS=Tetrachloroethene (PCE)

Results for: R3-C10.XLS=Tetrachloroethene (PCE)


Pearson correlation of Basement and First Floor = -0.061P-Value = 0.768



The regression equation isFirst Floor = 0.4592 - 0.237927 Basement

S = 1.50637 R-Sq = 0.4 % R-Sq(adj) = 0.0 %



Fitted Line Plot: First Floor versus Easement

Results for: COM-C04.XLS=1,3-Butadiene

Correlations: Easement, Soil Gas


Macro is running- . . . please wait


The regression equation isBasement = -0.358302 + 0.187559 Soil Gas

S = 0.801587 R-Sq = 67.6 % R-Sq(adj) = 61.1 %


Source DF SS MS F PRegression 1 6.69586 6.69586 10.4209 .0.023Error 5 3.21271 0.64254Total • 6 9.90857


Retrieving worksheet from file: A:\COM-C05.XLS=Benzene

Results for: COM-C05.XLS=Benzene


Pearson correlation of Basement and Soil Gas = -0.19SP-Value = 0.362

Macro is running .' . . please wait



S = 5.66987 R-Sq = 4.0 % R-Sq(adj) = 0.0 %

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Basement = 0.355803 - 0.0005341 Soil Gas

S = 1.61917 R-Sq = 0.3 % R-Sq(adj) = 0.0 %

Analysis of Variance •

Source DF SS. MS F PRegression 1 0.1928 0.19280 7.35E-02 0.789Error 21 '55.0559 2.62.171Total 22 55.2487


Retrieving worksheet from file: A:\COM-C03.XLS=1,2,4-Trimethylbenzene/

Results for: COM-C03.XLS=1,2,4-Trimethylbenzene

f


Pearson correlation of Easement and Soil Gas = 0.194P-Value = 0.375



The regression, equation isBasement = 9.36198 + 4.86233 Soil Gas

S = 13.1414 R-Sq = 3.8 % R-Sq(adj) = 0.0 %


Source DF SS MS F PRegression 1 141.77- 141.771 0.820925 0.375Error 21 3626.63 172.697Total 22 3768.40


Retrieving, worksheet from f i l e : A:\COM-C04.XLS=1,3-Butadiene

41

Retrieving worksheet from file: A:\COM-C07.XLS=Chloroform

Results for: COM-C07.XLS=Chloroform



Macro is running .. . please wait



S = 1.13888 R-Sq = 2.1 % R-Sq(adj) = 0.0 %




Retrieving worksheet from file: A:\COM-C08.XLS=Dichlorodifluoromethane (Freon 12)

Results for: COM-C08.XLS=Dichlorodifluoromethane (Freon 12)


Pearson correlation of Basement 'and Soil Gas = 0.113P-Value = 0.609



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Source DF SS MS F PRegression 1 . 27.930 27.9303 0.868819 0.362Srror 21 675.095 32.1474Total 22 703.026


Retrieving worksheet from file: A:\COM-C06.XLS=Carbon Tetrachloride

Results for: COM-C06.XLS=Carbon Tetrachloride


Pearson correlation of Basement and Soil Gas = -0.098F-Value = 0.656

Macro is running' ... please wait



S = 0.276577 R-Sq = 1.0 % R-Sq(adj) = 0.0 %


Source DF SS MS F FRegression 1 0.01560 0.0156049 0.204001. 0.656Error 21 1.60639 0.0764946Total 22 1.62199


43





S = 0.915922 R-Sq = 1.6 % R-Sq(adj) = 0.0 %


Source DF SS MS F PRegression 1 - 0.2775 0.277516 0.330804 0.571Error 21 17.6172 0.838913Total 22 17'. 8947


Retrieving worksheet from file: A: \COM-C11.XLS=Toluene

Results for: COM-C11.XLS=Toluene


Pearson correlation of Basement and Soil Gas = 0.014P-Value = 0.950 '




£ = 64.7956 R-Sq = 0.0 % R-Sq(adj) = 0.0 %


Source DF SS MS F PRegression 1 16.6 16.61 3.96E-03 0.950Error 21 88167.8 4198.47Total 22 88184-.4 ' •


46


S = 25.8725 R-Sq = 1.3 % R-Sq(adj) = 0.0 %

Analysis, of Variance

Source DF SS MS F PRegression 1 180.6 180.648 0.269871 0.609Error 21 14057.1 669.387Total 22 14237.8 (


Retrieving worksheet from file: A:\COM-C09.XLS=Styrene (+ o-Xylene for EPA soil Gas)

Results for: COM-C09.XL=Styrene (+ o-Xylene for EPA sol Gas)Correlations: Basement, Soil Gas




The regression equation isEasement = 12.1529 - 0.0176198 Soil Gas

S = 32.6479 R-Sq = 3.6 % R^Sq(adj) = 0.0 %


Source DF SS MS F PRegression 1 '828.6 828.61 0.777390 0.388Error 21 22383.6 1065.89Total 22 23212.2


Retrieving worksheet from file: A:\COM-C10.XLS=Tetrachlcroethene (PCE)

Results for: COM-C10.XLS=Tetrachloroethene (PCE)


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Basement = 5.61635 + 3.24864 Soil Gas

£ - 9.44837 R-Sq = 4.4 % . R-Sq(adj) = 0.0 %


Source DF SS MS F PRegression 1 85.67 • 85.6682 0.959634 0.338Error . 21 1874.71 89.2717Total 22 1960.37

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Retrieving worksheet from file: A:\COM-C12.XLS=Trichloroethene (TCE)

Results for: COM-C12.XLS=Trichloroethene (TCE)





The regression equation isEasement = 147.192 - 0.208166 Soil Gas

S = 647.496 R-Sq = 0.5 % R-Sq(adj) = 0.0 %


Source . DF SS MS F PRegression 1 43852 43852 0.104595 0.750Error 21 8804278 419251Total 22 8848130


Retrieving worksheet from file: A:\COM-C13.XLS=Trichiorofluoromethane (Freon 11)

Results for: COM-C13.XLS=Trichlorofluoromethane (Freon 11)


Pearson correlation of Easement-and Soil Gas = 0.209F-Value = 0.338



The regression equation is

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correlation & association analyses for soil gas … › work › 03 › 2065657.pdfmyers, 1993)....

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