optimal time for collecting volatile organic chemical ... · executivesummary...

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557 IL6of 1991-11 Optimal Time for Collecting Volatile Organic Chemical Samples from Slowly Recovering Wells: Appendixes Sheng-Fu J. Chou, Beverly L. Herzog, John R. Valkenburg, and Robert A. Griffin Final Report Hazardous Waste Research and Information Center Department of Energy and Natural Resources Dr. Gary D. Miller and Jacqueline Peden, Project Officers ENR Contract No. HWR 86019 1991 Open File Series 1991-11 Appendixes to Illinois State Geological Survey EG 142 and HWRIC RR-058 Illinois State Geological Survey 615 East Peabody Drive Champaign, Illinois 61820 Hazardous Waste Research and Information Center One East Hazelwood Drive Champaign, Illinois 61820

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Page 1: Optimal time for collecting volatile organic chemical ... · EXECUTIVESUMMARY Mostguidelinesforsamplinggroundwaterrequiretheevacuationofmultipleborevolumesfrom thewellbeforeasampleiscollected.Sucharecommendation,however

557

IL6of

1991-11

Optimal Time for Collecting VolatileOrganic Chemical Samples fromSlowly Recovering Wells: Appendixes

Sheng-Fu J. Chou, Beverly L. Herzog,John R. Valkenburg, and Robert A. Griffin

Final Report

Hazardous Waste Research and Information CenterDepartment of Energy and Natural ResourcesDr. Gary D. Miller and Jacqueline Peden, Project OfficersENR Contract No. HWR 86019

1991

Open File Series 1991-11

Appendixes to Illinois State Geological Survey EG 142and HWRIC RR-058

Illinois State Geological Survey615 East Peabody Drive

Champaign, Illinois 61820

Hazardous Waste Research and Information CenterOne East Hazelwood Drive

Champaign, Illinois 61820

Page 2: Optimal time for collecting volatile organic chemical ... · EXECUTIVESUMMARY Mostguidelinesforsamplinggroundwaterrequiretheevacuationofmultipleborevolumesfrom thewellbeforeasampleiscollected.Sucharecommendation,however

Digitized by the Internet Archive

in 2012 with funding from

University of Illinois Urbana-Champaign

http://archive.org/details/optimaltimefor1991chou

Page 3: Optimal time for collecting volatile organic chemical ... · EXECUTIVESUMMARY Mostguidelinesforsamplinggroundwaterrequiretheevacuationofmultipleborevolumesfrom thewellbeforeasampleiscollected.Sucharecommendation,however

Optimal Time for Collecting Volatile

Organic Chemical Samples fromSlowly Recovering Wells: Appendixes

Sheng-Fu J. Chou, Beverly L. Herzog,

John R. Valkenburg, and Robert A. Griffin

Final Report

Hazardous Waste Research and Information Center

Department of Energy and Natural Resources

Dr. Gary D. Miller and Jacqueline Peden, Project Officers

ENR Contract No. HWR 86019

1991

Open File Series 1991-11

Appendixes to Illinois State Geological Survey EG 142

and HWRIC RR-058

Illinois State Geological Survey

615 East Peabody Drive

Champaign, Illinois 61820

Hazardous Waste Research and Information Center

One East Hazelwood Drive

Champaign, Illinois 61820

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ACKNOWLEDGMENTS

This research was conducted under contract to the Hazardous Waste Research and Information

Center (HWRIC), a division ot the Illinois Department of Energy and Natural Resources. Dr. Gary

D. Miller and Jacqueline Peden were the project officers. SCA Chemical Services, Wilsonville,

Illinois, provided additional support.

This report, part of HWRIC's Research Report Series, was subjected to the Center's external

scientific peer review. Mention of trade names or commercial products does not constitute en-

dorsement.

Released by authority of the State of Illinois/1991

Page 5: Optimal time for collecting volatile organic chemical ... · EXECUTIVESUMMARY Mostguidelinesforsamplinggroundwaterrequiretheevacuationofmultipleborevolumesfrom thewellbeforeasampleiscollected.Sucharecommendation,however

CONTENTS

ACKNOWLEDGMENTS ii

EXECUTIVE SUMMARY 1

APPENDIXES 3

A Time Series Data for Determining Optimal Time for Sampling for Volatile

Organic Compounds 3

A1 Time series data for V1 D, September 1 986 3

A2 Time series data for V1D, April 1987 4

A3 Time series data for V1 D.June 1987 5

A4 Time series data for V1 M, September 1 986 6

A5 Times series data for V1M, April 1987 7

A6 Time series data for V1 M.June 1987 8

A7 Time series data for V1S, September 1986 9

A8 Time series data for V1S, April 1987 10

A9 Time series data for V1 S.June 1987 11

A10 Times series data for V2D, September 1986 12

A11 Time series data for V2D, April 1987 13

A12 Time series data for V2D, June 1987 14

A13 Time series data for V2M, September 1986 15

A14 Time series data for V2M, April 1987 16

A15 Time series data for V2M, June 1986 17

A16 Time series data for V2S, September 1986 18

A17 Time series data for V2S, April 1987 19

A18 Time series data for V2S. June 1987 20

A19 Time series data for V3D, September 1986 21

A20 Time series data for V3D, April 1987 22

A21 Time series data for V3D, June 1987 23

A22 Time series data for V3S, April 1 987 24

A23 Time series data for V3S. June 1 987 25

A24 Time series data for V4D, September 1986 26

A25 Time series data for W1M, April 1987 27

A26 Time series data for W1 M.June 1987 28

A27 Time series data for W2D, September 1 986 29

A28 Time series data for W2D, April 1987 30

A29 Time series data for W2D, June 1987 31

A30 Time series data for W3D, September 1986 32

A31 Time series data for W3D, April 1 987 33A32 Time series data for W3D, June 1 987 34

B Base/Neutral and Acid Fraction Compounds Found in Project Wells 35B 1 Base/neutral data for samples collected 24 hours after purging in September 1 986 36B2 Base/neutral data for samples collected in April 1987 37B3 Base/neutral data for samples collected in April 1987 38

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Page 7: Optimal time for collecting volatile organic chemical ... · EXECUTIVESUMMARY Mostguidelinesforsamplinggroundwaterrequiretheevacuationofmultipleborevolumesfrom thewellbeforeasampleiscollected.Sucharecommendation,however

EXECUTIVE SUMMARY

Most guidelines for sampling groundwater require the evacuation of multiple bore volumes from

the well before a sample is collected. Such a recommendation, however, is impractical for wells

finished in fine-grained deposits. These wells have such slow recharge that they cannot recover

rapidly enough for the requisite number of well volumes to be removed. For slowly recovering

wells, the sample usually is collected either 24 hours after evacuation or some time during well

recovery. Neither strategy has been supported by field evidence.

This study defines the optimum time to sample wells finished in fine-grained materials for volatile

organic compounds (VOCs). The investigation used wells installed for a previous ISGS project at

the SCA Services Inc. industrial waste disposal site near Wilsonville. This site was selected be-

cause the geology is typical of glaciated areas used for waste disposal in Illinois, which rendered

the results generally applicable. In addition, using the existing monitoring wells resulted in sub-

stantial cost savings.

The experiment, designed in conjunction with statistical consultants at the University of Illinois,

concentrated on volatile organic compounds because some are highly mobile and only small

samples are required. Three hundred samples were collected from 1 1 wells finished in fine-

grained glacial tills and analyzed for up to 19 volatile organic compounds. Each well was sampledbefore purging and at several time intervals, up to 48 hours, after purging. The experiment wasconducted three to five times on each well. Samples were collected with dedicated point-source

polytetrafluoroethylene (PTFE) bailers equipped with bottom-emptying devices designed for col-

lecting samples for volatile organic chemical analysis. The wells were evacuated easily with a

bailer because they were finished in slowly recharging materials with hydraulic conductivities be-

tween 1x1 CT6and 7x1

0" 5cm/sec.

The samples were analyzed for volatile organic compounds using a purge and trap liquid sample

concentrator and gas chromatograph. Samples were loaded into a frit sparge glassware and

purged with an inert gas that freed the volatile compounds, which were then trapped on absorb-

ent material. The trap was heated, and the volatile chemicals passed through a gas

chromatograph for analysis. To identifify and quantify the VOCs, the differential retention times

and peak areas shown on their chromatographs were compared with those of standard solutions

prepared in an ISGS laboratory.

Results of the volatile organic chemical analyses, listed in appendix A, were examined statistical-

ly using a general linear model and the Tukey honestly significant difference test to ascertain

whether the changes in water quality relative to time after purging were significant. At the 95% sig-

nificance level, chemical compositions were not significantly different at any time interval after

purging, although samples collected 4 hours after purging generally had slightly higher concentra-

tions than samples collected earlier or later. Concentrations of volatile organics, however, weresignificantly lower before purging than after purging. These results clearly show that wells finished

in fine-grained sediments should be purged before samples are collected for volatile organic

chemical analysis.

In a related experiment, 27 pairs of samples were collected for nonvolatile (extractable) organic

chemical analysis before purging and 24 hours after purging. Samples were not collected moreoften because not all of the wells recovered rapidly enough to produce the required samplevolume every few hours. The results of the nonvolatile organic chemical analysis are listed in ap-

pendix B.

The extractable samples were made basic and serially extracted, which produced the

base/neutral fraction. In the aqueous phase, the water was then acidified and serially extracted to

produce the acid fraction. Base/neutral extracts and acid extracts were concentrated sepa-rately for gas chromatographic analysis. The base/neutral and acid extracts were analyzed in

comparison with standard solutions consisting of compounds typically found in extracts. Up to 15

extractable compounds were found in these samples. Each positive result produced one data

pair, so that up to 15 pairs of data could result from a pair of samples. The 27 pairs of samples

Page 8: Optimal time for collecting volatile organic chemical ... · EXECUTIVESUMMARY Mostguidelinesforsamplinggroundwaterrequiretheevacuationofmultipleborevolumesfrom thewellbeforeasampleiscollected.Sucharecommendation,however

and the compounds found in each pair resulted in 192 pairs of data for the extractable organic

compounds.

Effects of purging on nonvolatile compounds were examined using the pairwise t-test on the con-

centration values. Concentrations of nonvolatile compounds after purging were statistically higher

at a significance level of 95% than those before purging.

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Page 48: Optimal time for collecting volatile organic chemical ... · EXECUTIVESUMMARY Mostguidelinesforsamplinggroundwaterrequiretheevacuationofmultipleborevolumesfrom thewellbeforeasampleiscollected.Sucharecommendation,however