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Plan for Assessment of the Occurrence, Status,
and Distribution of Volatile Organic Compounds
in Aquifers of the United States

By Wayne W. Lapham and Saeid Tadayon

Table of Contents

FOREWORD
GLOSSARY OF ASSESSMENT COMPONENTS
ABSTRACT
INTRODUCTION NATIONAL SYNTHESIS OF VOLATILE ORGANIC COMPOUNDS
PLAN FOR ASSESSMENT OF OCCURRENCE, STATUS, AND DISTRIBUTION OF VOLATILE ORGANIC COMPOUNDS IN GROUND WATER SUMMARY
REFERENCES CITED
SUPPLEMENTAL INFORMATION ERRATA (prior to December 30, 1996 posting)

ILLUSTRATIONS
1. Map showing Study Units of the National Water-Quality Assessment Program

TABLES
1. Volatile organic compound target analytes in the National Water-Quality Assessment Program

2. Timeline for data collection, compilation, and reporting of results for assessment of occurrence, status, and distribution of volatile organic compounds in ground water

3. Data requested for submittal to the national volatile organic compound (VOC) occurrence data base for use in assessment of occurrence, status, and distribution of VOCs in ground water

4. Details of data requested for submittal to the national volatile organic compound (VOC) occurrence data base for use in assessment of occurrence, status, and distribution of VOCs in ground water

5. Criteria for selection of volatile organic compound (VOC) data for assessment of occurrence, status, and distribution of VOCs in ground water

6. Selected volatile organic compounds (VOCs) measured by indicated U.S. Geological Survey National Water-Quality Laboratory schedules and U.S. Environmental Protection Agency methods

7. Examples of monitoring-program or well-network characteristics, requested data compilation, and anticipated analysis of the data

8. Suggested priority for well selection for assessment of occurrence, status, and distribution of volatile organic compounds (VOCs) to minimize bias attributable to well type

9. Example of a relational data-base file (called netsite.rdb) that identifies each well, for which volatile organic compound (VOC) analyte-concentration data are submitted, in relation to the monitoring program/network from the VOC data-inventory tables

10. Example of a relational data-base file (called netdes.rdb) that describes general information about each monitoring program in the volatile organic compound (VOC) data-inventory tables for which VOC analyte-concentration data are submitted

11. Example of a relational data-base file (called aqsite.rdb) that identifies each well, for which volatile organic compound (VOC) analyte-concentration data are submitted, in relation to the aquifer in which the monitoring well is screened

12. Example of a relational data-base file (called aqdes.rdb) that describes information about each aquifer/hydrogeologic unit for which volatile organic compound (VOC) analyte-concentration data are submitted

CONVERSION FACTORS

			-------------------------------------------------------------------
			Multiply                          By         To obtain               
			-------------------------------------------------------------------
			Length                                                               
			foot (ft)                           0.3048   meter                   
			mile (mi)                           1.609    kilometer               
			Area                                                                 
			square mile (mi2)                   2.590    square kilometer        
			Hydraulic Conductivity                                               
			inch per year (in/yr)               25.4     millimeter per year     
			foot per day (ft/d)                 0.3048   meter per day           
			Flow                                                                 
			million gallons per day (Mgal/d)    0.04381  cubic meter per second  
			Transmissivity                                                       
			foot squared per day (ft2/d)        0.09290  meter squared per day   
			-------------------------------------------------------------------
			
ABBREVIATIONS AND ACRONYMS
Listed below are abbreviations and acronyms that are used frequently in this report:

			CAS     Chemical Abstract Services

CERCLA Comprehensive Environmental Response, Compensation, and Liability Act

DD National Water-Quality Assessment Program Data Dictionary

GIS Geographic Information System

GWSI U.S. Geological Survey Ground-Water Site Inventory

IUPAC International Union of Pure and Applied Chemistry

LSD Land-surface datum

NAWQA National Water-Quality Assessment Program

NWIS U.S. Geological Survey National Water Information System

QWDATA U.S. Geological Survey Water-Quality Data Base

RCRA Resource Conservation and Recovery Act

USEPA U.S. Environmental Protection Agency

USGS U.S. Geological Survey

VOC Volatile organic compound


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