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U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5144

Gasoline-Related Compounds in Lakes Mead and Mohave, Nevada, 2004–06

Prepared in cooperation with the National Park Service

By Michael S. Lico and B. Thomas Johnson

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Table of Contents

Conversion Factors and Datum

Abstract

Introduction

Sample Collection and Analytical Methods

Quality Assurance

Gasoline-Related Compounds

Conclusions

Acknowledgments

References Cited

Figures

Figure 1. Location of study area and sampling sites, Lakes Mead and Mohave, Nevada.

Figure 2. Equipment used for collection of samples from Lakes Mead and Mohave, Nevada.

Figure 3. Median sum of BTEX concentrations for sites where water samples were collected from Lakes Mead and Mohave, Nevada, 2004–06.

Figure 4. Distribution of BTEX concentrations for samples collected from Lakes Mead and Mohave and Colorado River at Willow Beach, Nevada, 2004–06.

Figure 5. Concentrations of BTEX and time at Telephone Cove sampling site, Lake Mohave, Nevada, 2004–06.

Figure 6. Sum of PAH (polycyclic aromatic hydrocarbon) concentrations for sites where SPMDs (semipermeable membrane devices) were emplaced in Lakes Mead and Mohave, Nevada, 2004–06.

Figure 7. Sum of PAH (polycyclic aromatic hydrocarbon) concentrations for sites where lake-bottom sediment samples were collected from Lakes Mead and Mohave, Nevada, 2004–06.

Figure 8. PAH (polycyclic aromatic hydrocarbon) concentrations determined using Fluoroscan in SPMD (semipermeable membrane device) samples collected from Lake Mead, Nevada, 2004–06.

Tables

Table 1. Information for sampling sites in Lakes Mead and Mohave, Nevada.

Table 2. Laboratory reporting limits for BTEX and other volatile organic compounds analyzed for in water samples from Lakes Mead and Mohave, Nevada, 1999–2006.

Table 3. Organic compounds analyzed for in SPMD (semipermeable membrane device) extracts and associated laboratory reporting limits.

Table 4. Laboratory reporting limits for PAH (polycyclic aromatic hydrocarbon) compounds in sediment samples.

Table 5. Concentrations of BTEX, oxygenate, and degradation products in field blank water samples, Lakes Mead and Mohave, Nevada, 2004–06.

Table 6. Quality-assurance data associated with collection and analysis of SPMDs (semipermeable membrane devices) for PAHs (polycyclic aromatic hydrocarbons), Lakes Mead and Mohave, Nevada, 2004 and 2006.

Table 7. Concentrations of PAH (polycyclic aromatic hydrocarbon) compounds detected in lake- and stream-bottom sediment samples, Lakes Mead and Mohave, Nevada, 2004–06.

Table 8. Concentrations of PAH (polycyclic aromatic hydrocarbon) compounds in SPMD (semipermeable membrane device) extracts, Lakes Mead and Mohave, Nevada, 2004 and 2006.

Table 9. Estimated concentrations of PAH (polycyclic aromatic hydrocarbon) compounds in SPMD (semipermeable membrane device) dialysates using Fluoroscan, Lakes Mead and Mohave, Nevada.

Table 10. Microtox acute toxicity profile of chemicals sequestered with SPMDs (semipermeable membrane devices), Lakes Mead and Mohave, Nevada, 2004.

Table 11. Concentrations of BTEX, oxygenate, and degradation products in water samples collected from Lakes Mead and Mohave, Las Vegas Wash, and the Colorado River, Nevada, 1999–2006.

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Download the report (PDF, 2.9 MB)

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Send questions or comments about this report to the author, M.S. Lico, (775) 887-7626.