Major and Trace Elements in 35 Lake 

and Reservoir Sediment Cores From 

Across the United States, 1994–2001 

Data Series 166 

U.S. Department of the Interior

U.S. Geological Survey
Blank Page
Major and Trace Elements in 35 Lake 

and Reservoir Sediment Cores From 

Across the United States, 1994–2001 

By Peter C. Van Metre, Barbara J. Mahler, Jennifer T. Wilson, and 

Edward Callender 

U.S. Department of the Interior

U.S. Geological Survey

Data Series 166 
U.S. Department of the Interior

Gale A. Norton, Secretary

U.S. Geological Survey

P. Patrick Leahy, Acting Director

U.S. Geological Survey, Reston, Virginia: 2006

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reproduce any copyrighted materials contained within this report.

Suggested citation:

Van Metre, P.C., Mahler, B.J., Wilson, J.T., and Callender, Edward, 2006, Major and trace elements in 35 lake and

reservoir sediment cores from across the United States, 1994–2001: U.S. Geological Survey Data Series 166, 29 p.
iii

Contents

Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Study Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Core Collection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Analytical Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Major and Trace Elements in Lake Sediment Cores . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure

1. Map showing locations of lake sediment coring sites, 1994–2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.

Tables

1. Watershed characteristics of lakes and reservoirs sampled during 1994–2001 . . . . . . . . . . . . . . . . . . . . 3

2. Concentrations of selected major and trace elements in sediment cores . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Blank Page
Major and Trace Elements in 35 Lake 

and Reservoir Sediment Cores From 

Across the United States, 1994–2001

By Peter C. Van Metre, Barbara J. Mahler, Jennifer T. Wilson, and Edward Callender

Abstract

This report presents data on major and trace element concentrations in sediment cores collected from 35 lakes and reservoirs during 1994–2001. The lakes and reservoirs are located in 

or near 18 major urban areas across the United States and provide a geographically diverse coverage of urban land use for the 

country as well as some reference settings. Vertical intervals of 

the cores were analyzed for eight major elements and eight trace 

elements.

Introduction

One approach to reconstructing historical trends in trace 

elements in aquatic systems is to analyze sediment cores collected from lakes, reservoirs, estuaries, or the oceans. Analysis 

of sediment cores has been used to determine the historical contribution of localized sources to aquatic-sediment contamination (Covelli and others, 2001; Hornberger and others, 1999; 

Sonke and others, 2002; Spliethoff and Hemond, 1996). In other 

cases, sediment cores have been used to reconstruct histories of 

long-range atmospheric deposition in remote areas where no 

local sources are present (for example, the Swiss Alps (Birch 

and others, 1996) or the Indiana Dunes (Perkins and others, 

2000)). 

The purpose of this report is to present data for eight trace 

elements (arsenic, cadmium, chromium, copper, lead, mercury, 

nickel, and zinc) of environmental concern in lake and reservoir 

sediment cores at a national scale. The trace element data, as 

well as the major element and organic carbon data presented in 

this report, were collected as part of the U.S. Geological Survey 

(USGS) National Water-Quality Assessment (NAWQA) program, of which one goal is assessment of trends in water quality 

across the United States. During 1994–2001, sediment cores 

were collected from 35 lakes and reservoirs in or near 18 major 

urban areas (fig. 1; table 1). Land use in the watersheds ranges 

from undeveloped (reference) to entirely urbanized (dense 

urban).

Detailed information on collection, analysis, and agedating of the sediment cores for which data are presented in this 

report is available in Van Metre and others (2004). That report 

includes a discussion of study design, sampling-site selection, 

core collection and subsampling, and interpretation of radionuclide profiles to assign date of deposition to intervals within 

each core. A qualitative rating assigned to each core indicates 

the reliability of age assignments. 

Study Design 

Sediment cores were collected from 35 lakes and reservoirs in the United States during 1994–2001 (12 natural lakes 

and 23 reservoirs, hereinafter referred to as lakes except where 

the distinction is relevant). The 35 lakes are a subset of 58 lakes 

sampled by the USGS during 1992–2001, 56 of which are discussed in Van Metre and others (2004). The NAWQA design 

provided a national framework for identifying potential study 

areas (Gilliom and others, 1995). The selection of urban areas 

for this study was based on the combination of NAWQA study 

units, metropolitan statistical areas (MSAs) (U.S. Census 

Bureau, 1997), and ecoregions (Omernik, 1987). Urban areas 

were selected to broadly represent the diversity of ecoregions 

where a majority of U.S. cities and urban populations are 

located. Lakes were sampled in one or more cities in the five 

most populous (summing urban population only) level II ecoregions and eight of the 11 most populous ecoregions. The design 

provides a geographically diverse coverage of major urban 

areas of the country. In urban settings, residential and commercial land-use areas were favored, and large point-source and 

heavily contaminated industrial areas were avoided. Lakes with 

small drainage-area-to-surface-area ratios and undeveloped 

watersheds were chosen as reference lakes to assess trends in 

atmospheric fallout. 

The 35 lakes presented here (table 1) were selected 

from the 58 lakes sampled because (1) they are representative 
2 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001

of target land-use settings (urban and reference), (2) their 

sediment-core profiles do not appear to be unduly affected by 

diagenesis and post-depositional sediment mixing, and (3) the 

age-control for the cores was judged to be reliable for trend 

testing at least back to 1970. The date of 1970 was chosen as 

the starting point for trend testing because it coincides with a 

shift in national policy toward stronger environmental protection in the United States and thus is of interest for trend testing 

(Van Metre and Mahler, 2005; Mahler and others, 2006). Land 

use in the watersheds was categorized as dense urban (52- to 95-

percent urban land use; 13 lakes), light urban (6- to 43-percent 

urban; 13 lakes), or reference (less than 1.5-percent urban; nine 

lakes), as determined from the U.S. Geological Survey (1992) 

National Land Cover Data 1992 (NLCD92). Three of the nine 

reference lakes are water-supply reservoirs in protected watersheds, and five of the lakes and their watersheds are in county, 

state, or national parks; the remaining reference lake (Big 

Round Top Pond) has 1.5-percent developed land, consisting of 

one road and a few houses, and no evident agriculture or grazing 

land.

Core Collection

Cores were collected, in most cases, from the deepest 

part of the lake or in the downstream part of the reservoir 

where post-depositional disturbance was assumed to be minimal (Van Metre and others, 2004). Collection devices included 

Figure 1. Locations of lake sediment coring sites, 1994–2001.

 1. Lake Ballinger, Wash. 

 2. Tolt Reservoir, Wash. 

 3. Lake Washington, Wash.

 4. West Street Basin, Calif.

 5. R.R. Canyon Lake, Calif. 

 6. Sweetwater Reservoir, Calif.

 7. Lake Mead, Las Vegas Bay, Nev./Ariz.

 8. Great Salt Lake, Farmington Bay, Utah

 9. Red Butte Reservoir, Utah

10. Lake Elbert, Colo. 

11. Mills Lake, Colo.

12. Sloans Lake, Colo. 

13. Lake Como, Tex. 

14. Echo Lake, Tex.

15. Fosdic Lake, Tex. 

16. White Rock Lake, Tex. 

17. Town Lake, Tex.

18. Lake Houston, Tex.

19. Palmer Lake, West Lobe, Minn.

20. Lake Harriet, Minn.

21. Lake in the Hills, Ill. 

22. Beck Lake, Ill.

23. Shoe Factory Road Pond, Ill.

24. Berkeley Lake, Ga. 

25. Panola Lake, Ga.

26. Lake Killarney, Fla.

27. Lake Anne, Va. 

28. Orange Reservoir, N.J. 

29. Newbridge Pond, N.Y.

30. Big Round Top Pond, R.I.

31. Harris Pond, Middle, Mass.

32. Upper Mystic Lake, Mass.

33. South Reservoir, Mass.

34. Charles River, Lower, Mass. 

35. Crocker Pond, Maine

27

35

24

30

5

31

28

8

20

33

18

26

25

7

32

29

21

19

9

12

34

23

6

16

4

15 13

22

17

14

1

3 2

EXPLANATION

Reservoir and identifier (table 1)

 

Natural lake and identifier (table 1)

2

1

10 11
Introduction 3

Table 1. Watershed characteristics of lakes and reservoirs sampled during 1994–2001. 

[--, not recorded] 

1 Lake refers to naturally formed water body; reservoir refers to impounded stream or any other man-made lake.

2 Excludes drainage above upstream reservoirs.

Map ID

 (fig. 1)

Lake name

and state

Nearest major 

urban area

Date

sampled

Lake (L)

or

reservoir (R)1

Water depth

 at coring site 

(meters)

Watershed

area2

(square

kilometers)

Percent

urban land

use

Land-use

type

 1 Lake Ballinger, Wash. Seattle 06/08/1998 L 9.9 13.7 73.1 dense urban

 2 Tolt Reservoir, Wash. Seattle 06/11/1998 R 18.3 47.3 0 reference

 3 Lake Washington, Wash. Seattle 06/09/1998 L 62.5 1,470 37.6 light urban

 4 West Street Basin, Calif. Los Angeles 11/12/1998 R 1.2 3.30 79.8 dense urban

 5 R.R. Canyon Lake, Calif. Los Angeles 11/10/1998 R 11.3 1,860 8.3 light urban

 6 Sweetwater Reservoir, Calif. San Diego 09/24/1998 R 16.2 470 9.9 light urban

 7 Lake Mead, Las Vegas Bay, 

Nev./Ariz.

Las Vegas 05/11/1998 R 105.2 5,240 7.9 light urban

 8 Great Salt Lake, Farmington 

Bay, Utah

Salt Lake City 04/07/1998 L 1.2 10,300 11.0 light urban

 9 Red Butte Reservoir, Utah Salt Lake City 04/09/1998 R 7.6 19.7 0 reference

10 Lake Elbert, Colo. Denver 09/16/1999 L 5.5 1.06 0 reference

11 Mills Lake, Colo. Denver 09/14/1999 L 6.7 12.1 0 reference

12 Sloans Lake, Colo. Denver 08/19/1997 L 1.1 8.24 80.1 dense urban

13 Lake Como, Tex. Fort Worth 03/08/2001 R 7.8 2.70 93.9 dense urban

14 Echo Lake, Tex. Fort Worth 03/06/2001 R 4.6 2.60 95.5 dense urban

15 Fosdic Lake, Tex. Fort Worth 03/07/2001 R 2.4 1.20 83.7 dense urban

16 White Rock Lake, Tex. Dallas 07/06/1994 R 4.6 264 66.5 dense urban

17 Town Lake, Tex. Austin 08/26/1998 R 8.7 405 25.0 light urban

18 Lake Houston, Tex. Houston 07/10/1997 R 13.4 2,830 6.7 light urban

19 Palmer Lake, West Lobe, 

Minn.

Minneapolis 07/30/1997 L .6 64.2 51.9 dense urban

20 Lake Harriet, Minn. Minneapolis 07/29/1997 L 21.3 6.07 60.6 dense urban

21 Lake in the Hills, Ill. Chicago 07/19/2001 R 8.5 24.0 14.9 light urban

22 Beck Lake, Ill. Chicago 07/17/2001 R 4.0 3.26 21.3 light urban

23 Shoe Factory Road Pond, Ill. Chicago 07/18/2001 L .5 .02 0 reference

24 Berkeley Lake, Ga. Atlanta 05/19/1999 R 15.2 3.01 28.1 light urban

25 Panola Lake, Ga. Atlanta 05/18/1999 R 5.2 .54 1.1 reference

26 Lake Killarney, Fla. Orlando 03/16/1999 L 7.5 6.34 63.9 dense urban

27 Lake Anne, Va. Washington D.C. 06/24/1996 R 8.2 2.28 34.4 light urban

28 Orange Reservoir, N.J. Newark 09/18/1997 R -- 11.7 42.5 light urban

29 Newbridge Pond, N.Y. New York 09/22/1997 R 1.8 7.91 96.0 dense urban

30 Big Round Top Pond, R.I. Boston 07/25/2000 R 1.2 23.3 1.5 reference

31 Harris Pond, Middle, Mass. Boston 07/26/2000 R -- 82.8 10.6 light urban

32 Upper Mystic Lake, Mass. Boston 08/31/2000 L 1.4 66.2 67.3 dense urban

33 South Reservoir, Mass. Boston 09/01/2000 R 13.9 1.90 .2 reference

34 Charles River, Lower, Mass. Boston 07/28/2000 R 9.8 787 71.8 dense urban

35 Crocker Pond, Maine none 08/30/2000 L 2.7 .81 0 reference
4 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001

box corers, piston corers, gravity corers, and push corers. In 

all cases the sample was collected inside a clean polycarbonate 

liner. Cores were vertically extruded on-site and sectioned 

into intervals ranging in thickness from 0.5 to 5 centimeters 

or more, depending on the assumed or known sedimentation 

rate at the site, sample mass requirements for chemical 

analyses, and site-specific objectives. The sediment was not 

sieved. 

Analytical Methods 

Core sediment samples for major and trace element analyses were freeze-dried and ground to a fine powder. Elemental 

concentrations were determined on concentrated-acid digests 

either by inductively coupled plasma-atomic emission spectrometry (ICP/AES) (Lichte and others, 1987) or by inductively 

coupled plasma/mass spectrometry (ICP/MS) (Briggs and 

Meier, 2003). For samples using ICP/AES, cadmium was analyzed by graphite furnace atomic adsorption spectrometry 

(Aruscavage and Crock, 1987). Mercury concentrations were 

determined by cold vapor atomic adsorption spectroscopy 

(Brown and others, 2003). Quality assurance was provided by 

analyzing several standard reference materials (SRMs), an 

environmental duplicate, and a blank sample with each batch of 

as many as 20 samples. The two methods used for trace elements performed well on the basis of analyses of the same four 

SRMs. Median relative percent difference for all elements for 

all SRMs was 2.0 percent for ICP/AES and 4.4 percent for 

ICP/MS. Cadmium was not analyzed for one lake, and mercury 

was not analyzed for three lakes.

Major and Trace Elements in Lake Sediment 

Cores

Sediment cores ranged in length from 11 centimeters 

(South Reservoir and Crocker Pond) to 188 centimeters (Sweetwater Reservoir) (table 2, at end of report). The dates of deposition assigned to sampled intervals of the sediment core for 

each lake (Van Metre and others, 2004) also are listed in table 2. 

The lake with the shortest time recorded in the sediment core 

was Tolt Reservoir, which had bottom-of-core sediment estimated to have been deposited in 1965. The water bodies with 

the longest time recorded in sediment cores were Lake Elbert 

and Lake Harriet (natural lakes), both of which had bottom-ofcore sediment estimated to have been deposited during the 

1770s. Cores from seven lakes had bottom-of-core sediment 

estimated to pre-date 1900. 

Analysis of historical trends in trace elements in sediment 

cores from these 35 U.S. lakes is presented in Mahler and others 

(2006). Data for eight major elements, eight trace elements, and 

organic carbon analyzed in the sediment core from each of the 

35 lakes in this report are presented in table 2. 

Summary

Sediment cores from lakes and reservoirs can be used 

to reconstruct historical trends in trace elements in aquatic 

systems. Major and trace element and organic carbon data 

are presented here for sediment cores collected during 1994–

2001 from 35 lakes and reservoirs located in or near 18 major 

urban areas across the United States. Land use in the watersheds 

was categorized as dense urban, light urban, or reference. The 

sediment cores were vertically sectioned into intervals, each 

interval was analyzed for a suite of major and trace elements, 

and date of deposition for each interval was assigned. The age 

of bottom-of-core sediment ranged from the 1770s to 1960s.

References

Aruscavage, P.J., and Crock, J.G., 1987, Atomic absorption 

methods, in Baedecker, P.A., ed., Methods for geochemical 

analysis—Chapter C: U.S. Geological Survey Bulletin 1770, 

p. C1–C6.

Birch, L., Hanselmann, K.W., and Bachofen, R., 1996, Heavy 

metal conservation in Lake Cadagno sediments—Historical 

records of anthropogenic emissions in a meromictic alpine 

lake: Water Research, v. 30, no. 3, p. 679–687.

Briggs, P.H., and Meier, A.L., 2003, The determination of 

forty-two elements in geological materials by inductivelycoupled plasma mass spectrometry, in Taggart, J.E., Jr., ed., 

Analytical methods for chemical analysis of geologic and 

other materials: U.S. Geological Survey Open-File Report 

02–223–I, 16 p.

Brown, Z.A., O'Leary, R.M., Hageman, P.L., and Crock, J.G., 

2003, Mercury in water, geologic, and plant materials by continuous flow cold vapor atomic adsorption spectroscopy, in

Taggart, J.E., Jr., ed., Analytical methods for chemical analysis of geologic and other materials: U.S. Geological Survey 

Open-File Report 02–223–M, 11 p.

Covelli, Stefano, Brambati, Antonio, Faganeli, Jadran, and 

Horvat, Milena, 2001, Mercury contamination of coastal 

sediments as the result of long-term cinnabar mining activity 

(Gulf of Trieste, northern Adriatic Sea): Applied Geochemistry, v. 16, no. 5, p. 541–558.

Gilliom, R.J., Alley, W.M., and Gurtz, M.E., 1995, Design of 

the National Water-Quality Assessment Program—Occurrence and distribution of water-quality conditions: U.S. Geological Survey Circular 1112, 33 p.

Hornberger, M.I., Luoma, S.N., van Geen, Alexander, Fuller, 

C.C., and Anima, Roberto, 1999, Historical trends of metals 

in the sediments of San Francisco Bay, California: Marine 

Chemistry, v. 64, p. 39–55.

Lichte, F.E., Golightly, D.W., and Lamothe, P.J., 1987, Inductively coupled plasma atomic emission spectrometry, in

Baedecker, P.A., ed., Methods for geochemical analysis—

Chapter B: U.S. Geological Survey Bulletin 1770, 

p. B1–B10.
References 5

Mahler, B.J., Van Metre, P.C., and Callender, Edward, 2006, 

Trends in metals in urban and reference lake sediments 

across the United States, 1970 to 2001: Environmental 

Toxicology and Chemistry, v. 25, no. 7, p. 93–104.

Omernik, J.M., 1987, Ecoregions of the conterminous United 

States: Annals of the Association of American Geographers, 

v. 77, no. 1, p. 118–125.

Perkins, S.M., Filippelli, G.M., and Souch, C.J., 2000, Airborne 

trace metal contamination of wetland sediments at Indiana 

Dunes National Lakeshore: Water, Air, and Soil Pollution, 

v. 122, no. 1–2, p. 231–260.

Sonke, J.E., Hoogewerff, J.A., van der Laan, S.R., and 

Vangronsveld, Jaco, 2002, A chemical and mineralogical 

reconstruction of Zn-smelter emissions in the Kempen region 

(Belgium), based on organic pool sediment cores: The 

Science of the Total Environment, v. 292, no. 1–2, 

p. 101–119.

Spliethoff, H.M., and Hemond, H.F., 1996, History of toxic 

metal discharge to surface waters of the Aberjona watershed: 

Environmental Science and Technology, v. 30, no. 1, 

p. 121–128.

U.S. Census Bureau, 1997, Definitions of geographic concepts, 

including maps—Metropolitan areas (including MSAs 

and CMSAs): accessed March 12, 2006, at 

http://www.census.gov/epcd/www/g97geo2.htm

U.S. Geological Survey, 1992, National land cover data 1992 

(NLCD92): accessed March 12, 2006, at 

http://edc.usgs.gov/products/landcover/nlcd.html

Van Metre, P.C., and Mahler, B.J., 2005, Trends in hydrophobic 

organic contaminants in urban and reference lake sediments 

across the United States, 1970–2001: Environmental Science 

and Technology, v. 39, no. 15, p. 5,567–5,574.

Van Metre, P.C., Wilson, J.T., Fuller, C.C., Callender, Edward, 

and Mahler, B.J., 2004, Collection, analysis, and age-dating 

of sediment cores from 56 U.S. lakes and reservoirs sampled 

by the U.S. Geological Survey, 1992–2001: U.S. Geological 

Survey Scientific Investigations Report 2004–5184, 180 p.
6 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001 Table 2. Concentrations of selected major and trace elements in sediment cores—Continued. Map ID (fig. 1) Lake name Core ID Interval (centimeters) Esti- mated deposi- tion date1 Organic carbon (percent) Alu- minum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle 1 Lake Ballinger BAL.B 0 0.5 0.25 1998.3 11.3 68,400 18,400 44,700 9,330 981 2,100 5,710 7,200 11 2.0 98 99 296 0.43 66 571 1 1.5 1.25 1997.1 11.9 70,200 19,600 44,100 26,000 1,070 2,100 3,430 7,300 14 2.2 100 112 253 .46 79 681 2 2.5 2.25 1995.8 12.6 74,000 22,000 48,400 27,300 1,060 2,400 4,430 7,600 14 2.4 100 112 257 .50 80 720 3 3.5 3.25 1994.4 12.3 77,200 20,900 45,300 26,700 962 2,400 4,860 7,100 19 2.3 102 111 312 .51 86 709 4 4.5 4.25 1992.9 -- 62,000 19,300 47,500 16,000 942 3,300 3,570 7,300 16 2.3 106 108 303 .68 75 582 5 5.5 5.25 1991.4 10.6 66,600 18,900 43,900 12,700 910 2,100 4,430 7,400 18 2.2 102 104 391 .54 88 596 6 6.5 6.25 1989.5 9.5 73,100 20,200 45,500 22,700 946 1,600 4,510 8,450 19 2.0 110 106 450 .48 88 552 7 7.5 7.25 1987.5 8.8 79,000 21,100 45,400 23,300 925 1,300 4,860 8,400 12 2.0 118 109 495 .46 107 547 8 8.5 8.25 1985.1 8.6 80,800 21,600 46,500 19,300 919 1,400 5,570 8,900 22 2.1 119 116 610 .46 103 563 9 9.5 9.25 1982.5 8.1 63,800 14,700 39,000 16,000 745 1,100 3,710 7,500 19 2.0 108 106 646 .44 107 444 10 10.5 10.25 1979.6 7.8 75,600 16,400 44,200 18,700 812 1,300 5,000 7,700 20 1.9 125 120 659 .43 103 487 11 11.5 11.25 1976.6 7.4 77,800 15,800 43,200 20,000 749 1,400 5,140 7,100 21 2.2 124 136 652 .39 105 461 12 12.5 12.25 1973.3 7.0 86,800 13,600 47,600 20,700 774 1,400 5,570 7,200 21 2.0 126 135 588 .36 132 424 13 13.5 13.25 1970.0 6.7 77,200 14,400 46,600 17,300 692 1,500 4,430 7,200 19 1.7 116 134 486 .35 116 326 14 14.5 14.25 1967.0 7.2 92,400 15,600 47,100 22,000 682 1,300 6,290 6,300 19 1.7 108 101 396 .32 103 301 15 15.5 15.25 1964.0 7.4 89,100 16,100 46,200 19,700 702 1,400 5,930 6,800 20 1.4 108 86 338 .32 106 274 16 16.5 16.25 1961.2 8.1 82,200 15,600 41,800 17,300 696 1,500 4,710 6,200 21 1.2 123 79 239 .33 118 258 17 17.5 17.25 1958.7 9.6 78,200 16,900 38,100 12,700 682 1,600 4,570 6,100 20 1.1 89 68 194 .35 76 226 18 18.5 18.25 1956.3 10.4 58,400 15,800 39,100 11,300 769 1,600 3,290 6,100 19 1.3 91 64 187 .35 73 220 19 19.5 19.25 1954.2 11.3 73,400 18,200 38,800 11,300 762 1,700 4,290 5,500 20 1.4 84 70 207 .49 81 241 20 20.5 20.25 1952.3 14.7 55,000 14,400 26,600 11,300 696 1,600 2,000 2,700 19 1.7 55 49 140 .38 42 189 21 21.5 21.25 1950.3 14.4 62,200 15,300 25,700 19,300 682 1,600 2,430 2,800 19 1.8 58 46 149 .42 44 190 22 22.5 22.25 1948.3 14.5 56,800 14,000 24,800 14,000 689 1,700 2,290 2,500 18 1.5 55 45 137 .34 41 160 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.5 74,000 16,400 44,200 18,700 769 1,600 4,510 7,200 19 2.0 106 106 312 .43 88 444 2 Tolt Reservoir TLT.B 0 1 .5 1997.9 7.7 61,800 17,400 90,200 10,400 3,380 1,050 4,170 24,300 84 .6 46 106 24 -- 31 208 1 2 1.5 1996.4 8.1 63,400 17,500 64,100 10,200 1,990 1,000 3,000 26,000 65 .6 46 104 35 -- 33 201 2 3 2.5 1994.5 7.6 78,000 17,600 49,800 10,200 945 1,000 4,670 24,400 44 .6 49 107 34 -- 32 204 3 4 3.5 1992.1 7.9 71,000 20,000 44,400 12,200 951 960 3,560 28,100 37 .7 48 103 32 -- 34 200 4 5 4.5 1989.5 8.4 80,000 17,500 46,200 9,250 946 1,100 5,280 26,000 38 .7 54 108 25 -- 34 199 5 6 5.5 1987.0 11.2 76,900 16,100 44,600 9,500 1,030 1,100 4,670 23,000 40 .8 48 100 21 -- 32 186

6 7 6.5 1984.5 9.7 74,600 14,100 44,200 7,250 991 1,100 5,110 21,900 40 .7 49 107 27 -- 30 1747 8 7.5 1981.8 8.9 71,800 17,200 45,700 9,150 1,060 985 4,390 25,700 46 .6 50 102 29 -- 35 1898 9 8.5 1979.1 8.7 64,500 18,400 42,400 8,750 1,020 1,000 3,440 24,200 47 .5 45 98 24 -- 31 1769 10 9.5 1976.4 8.4 81,500 18,100 50,600 9,000 1,100 940 6,440 24,600 44 .6 54 100 24 -- 29 176

Table 2

Table 2. Concentrations of selected major and trace elements in sediment cores. [In milligrams per kilogram except as noted. --, not analyzed or not estimated; Pre-res., pre-reservoir; <, less than] Footnote at end of table.
Table 2 7

2 Tolt Reservoir

—Cont.

TLT.B

—Cont.

10 11 10.5 1973.6 7.9 75,800 18,000 49,000 9,500 1,090 1,100 5,670 25,800 43 0.6 50 108 19 -- 33 196

11 12 11.5 1970.9 7.8 92,900 15,200 55,100 8,250 1,020 1,100 8,220 19,100 42 .7 54 115 19 -- 30 21412 13 12.5 1968.3 -- 87,200 15,900 51,600 8,250 1,030 1,100 7,000 22,800 40 .6 54 104 30 -- 28 18613 14 13.5 1965.4 -- 65,600 18,000 44,900 9,900 1,170 1,100 3,440 27,700 37 .5 48 102 28 -- 21 191

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2 75,200 17,500 47,600 9,380 1,030 1,080 4,670 24,500 43 .6 49 104 26 -- 32 194

3 Lake 

Washington 

WAS-B 0 .5 .25 1998.0 4.4 38,600 13,900 50,300 13,800 5,850 2,200 4,400 7,700 17 1.2 62 64 131 0.34 53 246

.5 1 .75 1996.9 4.4 35,800 12,900 47,200 13,600 5,440 2,400 4,100 4,900 16 1.4 61 65 103 .28 52 238

1 1.5 1.25 1995.5 4.3 44,000 14,100 52,500 14,400 6,590 2,200 5,300 7,700 24 1.3 63 67 129 .35 53 2471.5 2 1.75 1994.1 4.5 41,600 14,400 53,200 13,800 7,210 2,100 4,900 8,100 20 1.3 63 68 137 .35 60 2502 2.5 2.25 1992.7 4.5 42,600 14,700 59,300 12,800 7,390 2,400 4,800 8,800 21 1.4 71 74 156 .37 54 2722.5 3 2.75 1991.1 4.5 40,600 14,600 59,400 14,300 7,210 2,350 4,950 8,400 25 1.3 67 68 147 .38 61 2653 3.5 3.25 1989.4 4.6 35,900 13,600 57,700 12,400 5,920 2,500 4,900 8,900 20 1.4 66 89 142 .47 58 2793.5 4 3.75 1987.6 4.5 47,200 13,900 63,900 14,800 5,210 2,600 5,900 7,900 20 1.3 72 72 159 .40 58 2784 4.5 4.25 1985.8 4.5 42,000 14,000 59,900 12,400 3,730 2,500 5,200 8,900 22 1.4 70 71 165 .42 57 2764.5 5 4.75 1984.0 4.3 43,200 13,000 56,400 12,800 3,300 2,900 5,100 8,100 14 1.6 71 78 184 .41 60 2925 5.5 5.25 1982.1 4.5 35,900 12,600 48,800 12,800 3,040 2,900 3,600 9,100 11 1.6 70 76 182 .42 77 3095.5 6 5.75 1980.3 4.3 32,600 11,900 45,500 10,000 3,270 3,900 3,300 8,600 14 1.6 67 78 241 .45 72 2996 6.5 6.25 1978.6 4.4 33,200 11,300 49,700 12,000 3,180 4,100 3,900 8,900 16 1.7 67 81 285 .53 72 2996.5 7 6.75 1977.0 4.2 40,300 11,600 53,100 12,400 2,920 3,900 4,300 8,200 20 1.6 73 84 285 .51 72 2727 7.5 7.25 1975.4 4.0 33,000 11,500 45,900 10,400 2,520 3,600 3,100 8,600 19 1.6 69 76 249 .59 68 2617.5 8 7.75 1973.8 4.4 31,100 10,400 46,300 8,600 2,560 4,100 2,500 8,300 18 1.9 66 79 251 .58 67 2638 8.5 8.25 1972.2 4.6 38,800 11,600 50,500 10,700 2,390 3,500 3,500 9,050 13 1.8 80 90 264 .59 75 2658.5 9 8.75 1970.4 6.6 44,200 12,200 51,600 11,800 2,860 3,700 4,800 8,600 14 2.0 87 88 264 .73 74 2899 9.5 9.25 1968.7 4.7 49,000 12,000 58,000 13,600 2,730 5,100 5,600 8,500 16 1.9 87 86 233 .75 74 2889.5 10 9.75 1966.8 4.5 41,700 11,600 50,300 13,200 2,790 4,300 5,100 9,200 10 1.8 85 80 210 .62 68 253

10 10.5 10.25 1965.0 4.3 38,300 11,600 49,200 11,000 2,640 4,900 3,800 8,600 13 1.9 86 79 164 .66 61 24810.5 11 10.75 1963.1 4.3 44,600 11,000 50,500 13,400 2,440 4,500 4,800 8,300 12 1.7 88 79 154 .65 63 25111 11.5 11.25 1961.2 4.6 29,300 11,200 46,900 8,200 2,320 4,900 3,700 8,700 25 1.1 84 82 154 .66 67 25711.5 12 11.75 1959.2 4.5 32,800 10,100 43,900 7,800 2,220 4,200 3,900 8,200 29 1.2 72 71 135 .62 52 22912 12.5 12.25 1957.4 4.3 29,400 9,410 41,300 5,800 2,520 3,500 4,900 7,900 30 1.3 66 68 138 .64 48 21112.5 13 12.75 1955.5 4.2 23,600 8,710 37,700 6,600 2,860 3,700 3,400 8,900 18 1.4 70 71 131 .61 53 23313 13.5 13.25 1953.6 4.4 24,600 8,710 40,900 8,400 2,650 3,800 3,900 8,300 20 1.5 70 75 125 .62 59 25713.5 14 13.75 1951.7 4.3 41,900 11,400 45,300 13,200 2,680 3,350 5,000 8,250 30 1.9 78 74 156 .66 54 25914 14.5 14.25 1949.8 4.4 28,900 8,350 39,700 8,800 1,930 2,900 3,900 7,900 33 1.6 70 76 134 .70 60 24614.5 15 14.75 1947.7 4.2 31,700 7,290 39,500 7,400 1,760 2,300 5,300 6,500 23 1.8 66 74 123 .62 49 236

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
8 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001 3 Lake Washington —Cont. WAS-B —Cont. 15 16 15.5 1944.1 4.0 29,300 10,900 36,800 7,000 1,330 1,900 4,100 8,900 32 2.7 75 72 115 0.63 51 229 16 17 16.5 1939.1 4.0 28,100 8,820 35,600 8,400 1,130 1,400 3,800 8,500 24 2.3 71 66 97 .63 51 206 17 18 17.5 1934.3 3.7 22,300 8,590 29,200 4,400 1,600 1,200 3,100 7,800 34 2.1 55 51 74 .66 35 142 18 19 18.5 1929.0 3.5 28,900 11,000 36,900 4,800 2,030 1,400 3,700 9,200 36 1.4 59 53 84 .55 46 162 19 20 19.5 1923.6 3.5 31,600 12,100 40,500 4,400 1,410 1,900 4,600 9,500 33 1.3 64 57 70 .53 47 169 20 21 20.5 1918.1 3.7 28,900 11,900 36,100 4,400 1,460 1,200 3,700 9,700 31 1.1 61 55 72 .55 44 166 21 22 21.5 1912.6 4.1 31,300 10,600 40,400 3,200 1,360 1,100 5,800 9,600 19 1.1 58 60 64 .35 41 158 22 23 22.5 1907.2 4.4 29,900 11,000 35,100 3,800 1,460 1,100 3,900 8,900 26 1.6 58 56 75 .53 44 152 23 24 23.5 1902.0 4.8 42,200 11,400 38,500 3,400 1,520 1,150 4,150 8,850 22 1.2 62 51 40 .34 49 135 24 25 24.5 1897.2 5.2 27,800 8,710 40,500 3,400 1,720 1,600 2,700 7,900 19 .6 58 41 31 .27 42 118 25 27 26 1890.1 5.5 26,600 10,400 40,400 4,800 1,940 1,900 3,100 8,100 16 .6 56 36 26 .22 43 116 27 29 28 1880.7 5.7 25,300 10,600 38,800 5,400 1,930 1,900 3,100 8,100 7.8 .3 58 26 23 .12 42 85 29 31 30 1871.4 5.7 25,700 11,000 39,100 5,400 1,930 1,700 3,500 8,300 9.3 .2 57 25 22 .12 39 79 31 33 32 1861.6 5.0 25,600 12,100 37,600 4,800 1,730 1,400 3,900 9,500 6.4 .2 63 25 19 .12 39 81 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4 32,900 11,500 45,700 9,400 2,540 2,500 4,000 8,500 20 1.4 67 72 136 .53 54 247 4 West Street Basin WST.2 0 2 1 1998.3 8.7 69,800 31,000 43,900 15,200 601 1,410 19,500 13,800 8.0 2.7 73 135 154 .32 38 800 243 1996.8 7.5 71,500 35,300 46,900 15,700 642 1,450 20,500 13,400 8.4 2.4 74 117 448 .34 37 731 465 1995.0 6.5 75,800 25,100 51,200 16,900 692 1,520 21,500 13,500 9.2 2.1 81 99 106 .19 37 673 687 1992.9 8.9 72,800 24,000 43,000 14,200 592 1,370 20,900 16,200 8.2 2.6 75 126 144 .32 35 776 8 10 9 1990.5 12.6 65,000 28,000 38,600 12,800 537 1,600 18,500 14,500 7.8 3.6 73 166 207 .50 37 950 10 12 11 1988.5 10.6 67,500 20,500 38,800 12,600 509 1,330 19,600 15,100 7.6 4.0 78 195 226 .53 39 929 12 14 13 1986.8 9.9 64,800 26,400 34,200 11,000 468 1,380 19,200 15,600 6.7 3.5 70 154 222 .58 33 848 14 16 15 1984.8 9.1 66,000 41,500 39,600 12,600 520 1,350 19,600 14,300 8.0 4.7 76 175 252 .85 37 893 16 18 17 1982.9 11.6 63,500 36,200 34,700 12,200 460 1,220 17,400 13,800 8.2 4.2 67 187 237 1.00 35 900 18 20 19 1981.0 10.1 73,600 32,200 38,400 12,500 513 1,340 22,200 17,900 10 5.2 80 185 447 1.10 42 1,110 20 22 21 1978.8 10.1 68,000 38,000 42,100 14,000 563 1,440 19,200 13,100 12 5.2 109 224 475 1.90 46 1,050 22 24 23 1976.5 6.9 74,300 25,000 40,400 13,600 567 1,330 21,800 15,300 9.2 2.9 82 118 319 1.10 37 570 24 26 25 1973.8 6.7 76,500 22,700 45,300 16,200 602 1,290 21,700 15,000 8.8 3.3 83 101 445 .90 44 652 26 28 27 1970.4 8.4 69,600 21,000 34,700 11,800 455 1,280 20,600 16,700 8.2 3.5 69 126 693 .55 37 646 28 30 29 1967.2 9.3 78,600 20,900 42,000 13,500 492 1,420 21,700 16,300 11 4.6 81 180 810 .65 46 826 30 32 31 1964.0 10.6 70,400 20,400 40,000 13,500 505 1,220 20,500 15,000 10 3.4 85 139 1,330 .73 44 786 32 34 33 1960.2 11.1 70,000 18,000 44,700 14,700 531 1,460 20,300 13,300 15 7.0 108 228 2,270 .88 57 1,060

34 36 35 1956.5 12.8 65,000 20,300 42,600 13,000 506 1,620 19,000 12,500 16 10.4 128 271 3,320 1.00 67 1,44036 38 37 1952.8 8.6 93,200 18,600 42,400 12,100 511 4,120 19,500 11,600 16 7.1 102 191 1,910 .79 53 1,040

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.3 70,000 25,000 42,000 13,500 520 1,380 20,300 14,500 8.8 3.6 80 166 445 .73 38 848

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
Table 2 9

5 R.R. Canyon 

Lake 

CYN 0 2 1 1998.7 2.8 97,800 22,000 69,900 19,400 1,200 1,420 21,400 4,550 13 0.6 69 339 27 0.06 33 222

243 1998.4 2.9 94,500 27,700 68,800 18,800 1,340 1,440 20,100 4,140 13 .6 64 340 26 .06 30 214465 1998.1 3.2 92,600 33,100 67,400 18,400 1,420 1,500 20,200 4,160 14 .5 63 350 26 .05 30 205687 1997.7 3.0 93,900 28,800 69,900 18,700 1,480 1,620 20,800 4,240 13 .6 66 343 27 .06 31 208

10 12 11 1997.0 2.4 94,700 25,200 76,500 19,300 1,330 1,530 22,200 4,170 13 .5 66 156 28 .05 31 21014 16 15 1996.0 1.6 94,300 15,800 76,100 20,800 1,220 1,380 23,800 4,690 8.6 .5 70 85 27 .06 31 20718 20 19 1995.0 2.9 83,000 42,500 60,400 16,400 1,070 1,090 18,600 4,430 14 .6 62 256 33 .08 31 18422 24 23 1994.2 3.2 78,900 47,000 61,700 15,600 1,150 1,050 18,200 4,710 16 .6 61 425 38 .07 30 18432 34 33 1992.1 1.4 93,400 17,500 74,000 19,600 1,200 1,340 22,400 5,080 9 .4 63 209 30 .06 30 19342 44 43 1989.7 1.7 98,500 20,500 68,700 19,800 1,140 1,260 20,500 5,490 11 .5 63 131 33 .06 32 18452 54 53 1987.0 1.3 103,000 20,500 73,400 22,000 1,150 1,130 22,200 6,350 10 .4 67 66 26 .08 33 18362 64 63 1983.6 1.9 102,000 17,000 71,900 20,100 1,160 1,310 21,700 4,650 12 .5 69 122 46 .07 31 19072 74 73 1980.2 2.2 92,900 27,800 56,000 17,400 923 870 18,800 5,780 15 .8 68 289 70 .06 33 18276 78 77 1979.0 1.9 93,500 28,400 58,300 17,800 910 864 19,200 5,500 15 .7 68 241 52 .06 33 17984 88 86 1976.2 1.3 96,800 22,100 61,300 19,000 879 892 20,700 5,110 12 .7 70 98 35 .06 34 18296 100 98 1972.0 1.2 104,000 17,400 77,000 22,800 1,030 1,170 27,800 7,480 7.5 .4 70 62 26 .06 32 192

104 108 106 1968.5 1.5 100,000 18,900 73,300 19,500 1,400 1,270 24,700 5,030 9.5 .5 69 123 33 .06 32 185124 128 126 1961.0 1.8 82,300 51,400 55,900 16,300 816 815 19,000 5,000 10 .6 58 155 29 .06 28 144144 148 146 1954.4 1.4 102,000 20,900 74,600 23,800 1,060 1,160 25,700 5,490 8.6 .5 69 60 21 .05 31 184164 168 166 Pre-res. 1.6 105,000 15,600 72,800 20,700 965 1,230 22,000 4,810 10 .4 70 60 20 .06 30 176

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 94,600 22,000 69,900 19,400 1,150 1,240 21,100 4,900 12 .5 67 156 28 .06 31 184

6 Sweetwater 

Reservoir 

SWT.4 0 4 2 1998.3 3.0 58,100 18,100 55,600 11,200 1,750 880 3,000 5,000 19 .1 42 87 25 .07 22 153

8 12 10 1996.5 2.8 63,800 15,900 56,600 10,500 1,730 960 2,780 4,880 15 .1 42 90 27 .05 24 151

16 20 18 1994.3 2.8 75,600 15,900 60,000 10,200 1,590 880 3,000 4,880 15 .1 46 103 22 .06 22 15424 28 26 1992.1 3.0 72,400 26,600 58,400 11,900 1,520 950 3,890 5,380 25 .2 51 129 26 .06 25 15032 36 34 1989.9 3.0 85,900 23,900 61,600 13,000 1,510 930 4,560 5,250 26 .2 51 151 28 .05 22 15040 44 42 1987.8 2.8 89,400 19,600 60,600 11,800 1,600 900 4,000 4,620 26 .2 53 143 22 .06 22 14048 52 50 1985.6 2.6 79,900 15,100 62,400 10,000 1,710 1,100 2,780 4,880 19 .2 52 112 18 .05 23 15156 60 58 1983.2 2.6 81,000 16,800 60,500 9,750 1,670 1,100 3,560 5,000 19 .2 51 109 28 .06 25 14764 68 66 1980.4 2.4 108,000 14,500 68,500 9,500 1,530 1,200 5,670 4,880 22 .2 56 101 19 .06 25 16372 76 74 1977.6 3.2 91,200 23,600 61,200 12,200 1,440 930 5,440 5,500 22 .2 57 183 34 .06 26 14180 84 82 1975.0 3.2 65,900 27,900 58,300 10,200 1,330 890 3,890 5,380 18 .2 53 222 27 .05 22 14188 92 90 1972.5 3.0 70,400 24,600 57,700 9,750 1,150 830 3,670 5,000 21 .2 56 184 34 .05 26 13196 100 98 1969.8 3.0 60,900 20,500 59,800 9,000 1,180 950 3,440 5,120 13 .2 53 221 23 .05 22 141

104 108 106 1967.1 2.8 72,600 19,600 57,200 9,050 1,240 1,000 4,000 5,560 15 .2 54 202 28 .05 29 143112 116 114 1964.0 2.8 56,600 19,600 55,000 8,500 1,220 840 3,110 5,250 19 .2 57 233 22 .05 29 139

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
10 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001 6 Sweetwater Reservoir —Cont. SWT.4 —Cont. 120 124 122 1961.1 3.0 45,200 18,100 53,000 7,500 1,250 810 2,440 5,620 20 0.3 51 324 18 0.05 26 151 128 132 130 1958.6 3.5 48,000 13,700 56,000 7,500 1,260 850 3,440 5,500 23 .3 51 513 29 .06 26 160 136 140 138 1956.2 3.0 75,000 13,400 58,500 6,000 1,160 830 9,330 4,620 25 .3 64 304 29 .04 29 154 144 148 146 1953.4 2.7 76,000 13,800 57,100 7,000 900 940 3,000 5,620 15 .2 60 97 20 .04 34 143 152 156 154 1949.1 2.7 92,900 17,300 63,100 9,750 839 660 13,200 8,250 17 .1 71 53 28 .03 24 137 160 164 162 1943.6 2.3 54,800 19,100 49,900 11,000 1,120 590 7,440 12,900 12 <.1 58 48 21 .03 22 137 168 172 170 1939.1 2.7 71,500 14,800 59,200 7,750 951 890 2,890 5,620 12 <.1 58 99 28 .04 25 141 176 180 178 1935.8 2.1 59,200 15,000 57,900 5,750 849 920 3,110 3,880 16 <.1 60 94 34 .04 33 140 184 188 186 Pre-res. 3.4 72,200 17,600 56,100 11,500 878 660 9,000 10,200 12 <.1 63 54 30 .03 24 144 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8 72,300 17,900 58,400 9,750 1,260 895 3,610 5,250 19 .2 54 120 27 .05 25 144 7 Lake Mead LVB-S4 0 3 1.5 1998.0 1.2 6,100 45,400 11,700 34,700 709 1,100 16,700 4,800 14 .2 18 48 41 .07 19 149 3 6 4.5 1996.8 1.3 5,700 49,000 11,500 35,700 681 1,000 16,100 4,500 18 .2 16 43 56 .08 19 134 6 9 7.5 1995.5 1.6 5,800 41,600 11,900 32,700 807 1,100 17,000 4,400 18 .2 16 43 59 .05 20 120 9 12 10.5 1994.1 1.4 6,200 40,800 12,600 34,000 829 1,200 16,700 4,500 22 .1 17 42 53 .07 20 120 12 15 13.5 1992.8 .9 7,000 46,000 13,900 36,000 878 1,100 17,600 4,700 25 .1 21 41 51 .07 18 116 18 21 19.5 1989.8 1.0 5,950 46,200 12,100 38,300 900 1,150 17,200 4,750 26 .1 20 42 64 .11 21 116 24 27 25.5 1986.5 1.2 7,300 45,500 13,600 40,300 1,040 1,300 19,200 4,900 31 .1 21 39 68 .04 23 118 27 30 28.5 1984.5 -- 11,500 45,600 18,200 32,000 1,010 1,300 20,400 5,500 33 .2 29 38 76 .04 27 120 30 33 31.5 1982.1 .5 15,300 39,900 22,200 30,300 1,010 1,200 20,800 9,400 28 .2 43 38 78 .01 21 104 36 39 37.5 1977.4 .6 7,000 37,500 16,800 33,300 1,260 1,300 20,400 5,200 37 .2 48 41 92 .04 33 135 42 45 43.5 1973.4 1.2 7,300 48,100 22,500 36,700 1,170 1,300 20,000 4,200 37 .3 126 44 102 .02 82 137 50 55 52.5 1967.0 1.1 5,100 45,400 15,100 26,000 1,090 1,100 17,500 4,800 28 .2 125 39 91 .03 88 110 60 65 62.5 1962.9 1.1 5,700 42,600 19,100 31,000 1,060 1,200 19,500 5,100 25 .2 122 40 85 .02 80 116 70 75 72.5 1960.6 1.9 5,200 50,500 14,600 31,700 842 1,100 17,500 4,600 22 .2 108 36 83 .02 79 121 80 85 82.5 1958.3 1.2 4,400 61,200 14,100 39,700 720 880 18,100 4,700 18 .1 117 34 88 .02 75 112 85 90 87.5 1957.1 .9 4,000 80,000 13,300 44,300 720 850 15,800 5,300 17 .1 129 34 105 .05 79 99 90 95 92.5 1955.9 1.1 5,300 54,900 11,200 32,700 734 910 15,500 5,800 12 .1 102 30 100 .04 66 93 100 105 102.5 1953.7 1.0 6,800 47,800 11,300 27,300 778 920 16,700 4,500 11 .1 109 32 85 .05 68 98 105 110 107.5 1952.5 .8 5,300 49,500 12,400 30,700 796 760 16,800 4,600 13 .1 109 35 82 .03 72 112 115 120 117.5 1949.8 .4 8,600 49,900 9,900 24,300 291 380 15,500 7,100 15 .1 94 15 32 .01 66 52 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 6,020 46,100 13,400 33,000 835 1,100 17,400 4,780 22 .1 71 39 80 .04 49 116 8 Great Salt Lake FAR.B 0 1 .5 1997.1 -- 8,860 41,200 5,840 18,700 433 1,610 18,000 83,000 11 .4 15 113 76 -- 13 194 1 2 1.5 1994.7 -- 11,100 52,800 7,530 19,700 499 1,560 16,900 50,000 19 .4 20 131 90 -- 9.8 218

2 3 2.5 1991.5 -- 12,000 48,800 7,660 18,000 516 1,440 17,500 40,200 20 .4 25 146 96 -- 17 236

3 4 3.5 1987.8 -- 12,000 42,800 8,050 19,700 511 1,330 16,900 35,500 21 .4 25 143 119 -- 13 2394 5 4.5 1983.6 -- 13,900 51,300 9,220 21,300 520 1,330 17,600 32,800 21 .4 29 149 129 -- 18 244

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
Table 2 11

8 Great Salt 

Lake—Cont.

FAR.B

—Cont.

5 6 5.5 1979.1 -- 13,400 45,200 8,830 23,000 541 1,330 17,500 31,000 19 0.4 29 158 113 -- 20 249

6 7 6.5 1974.6 -- 13,400 63,300 9,090 26,000 547 1,330 16,700 31,300 24 .4 31 169 117 -- 22 2487 8 7.5 1970.3 -- 13,400 76,000 9,220 27,000 540 1,440 16,900 33,200 25 .3 30 188 117 -- 19 2458 9 8.5 1966.3 -- 11,800 50,500 7,660 23,000 517 1,330 15,900 34,300 17 .3 24 140 116 -- 17 2309 10 9.5 1962.0 -- 12,600 75,800 8,270 21,800 554 1,180 16,400 36,800 22 .4 23 126 102 -- 17 224

10 11 10.5 1957.3 -- 13,000 106,000 8,700 18,000 564 1,070 16,700 35,300 22 .4 21 111 107 -- 18 212

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -- 12,600 51,300 8,270 21,300 520 1,330 16,900 35,300 21 .4 25 143 113 -- 17 236

9 Red Butte Reservoir RED.1 0 2 1 1998.2 3.7 28,400 43,500 24,100 16,000 594 1,600 26,600 5,500 10 .3 66 114 26 <0.02 28 132 243 1997.7 3.0 33,500 41,500 26,800 18,000 638 1,600 28,200 6,400 13 .3 70 176 25 <.02 29 129

10 12 11 1995.3 2.9 29,900 28,000 25,400 13,400 680 1,700 25,800 6,850 11 .3 66 33 19 <.02 33 13620 22 21 1992.0 2.9 49,500 31,500 31,800 16,000 714 1,900 28,800 6,800 12 .3 78 33 24 <.02 37 14030 32 31 1988.4 2.9 44,700 32,700 29,600 15,000 706 1,900 27,400 7,600 11 .3 73 33 25 <.02 34 13640 42 41 1984.8 2.8 44,400 33,300 28,600 14,500 703 1,900 26,200 7,200 12 .3 67 30 30 <.02 31 13250 52 51 1981.1 2.9 48,700 33,500 30,900 14,000 678 1,800 27,700 6,950 11 .3 68 31 24 <.02 26 13260 62 61 1977.2 3.1 45,700 31,100 30,500 14,500 705 1,800 27,400 6,700 11 .3 72 31 30 <.02 32 14470 72 71 1973.2 2.8 40,700 30,900 27,000 13,000 703 1,800 25,400 6,700 10 .3 64 26 26 <.02 28 12480 82 81 1969.2 2.9 60,700 20,200 40,500 13,000 565 1,500 30,800 3,900 12 .3 150 35 19 <.02 81 13692 94 93 1964.8 3.5 59,900 20,700 38,800 13,000 578 1,400 29,200 3,600 13 .3 153 36 18 <.02 87 121

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 44,700 31,500 29,600 14,500 680 1,800 27,400 6,700 11 .3 70 33 25 <.02 32 132

10 Lake Elbert EBT.B1 0 .5 .25 1997.0 7.5 58,200 4,860 25,400 6,120 207 2,340 14,800 6,230 7.0 .4 34 48 60 .09 13 113

.5 1 .75 1991.7 7.4 55,100 4,970 25,100 6,360 206 2,260 15,700 6,730 6.6 .4 34 26 61 .09 13 108

1 1.5 1.25 1985.9 7.2 55,900 4,900 24,900 6,340 206 2,230 15,100 6,420 8.3 .5 33 34 63 .10 13 1141.5 2 1.75 1980.2 7.0 57,500 4,880 25,900 6,620 213 2,220 15,900 6,620 7.2 .6 35 28 70 .11 14 1162 2.5 2.25 1974.6 6.7 58,600 4,620 24,600 6,340 204 2,120 15,400 6,400 7.1 .7 34 31 71 .09 13 1162.5 3 2.75 1969.3 6.5 63,200 5,240 27,300 7,200 225 2,210 17,100 7,140 7.7 .8 38 29 82 .09 14 1293 3.5 3.25 1964.5 6.2 59,000 4,530 24,400 6,420 203 2,040 15,400 6,470 7.9 .7 34 26 75 .09 13 1203.5 4 3.75 1958.7 5.8 60,200 4,840 26,000 7,000 219 1,740 16,600 7,060 7.3 .8 37 26 81 .09 14 1194 4.5 4.25 1953.3 5.7 61,000 4,890 26,200 6,980 216 1,980 16,700 7,020 8.4 .8 37 30 81 .09 13 1264.5 5 4.75 1947.6 5.3 62,500 4,920 26,700 7,190 225 1,940 17,500 7,420 9.3 .7 37 27 75 .08 14 1235 6 5.5 1938.2 5.2 62,400 5,040 26,900 7,130 226 1,930 17,500 7,430 7.9 .6 37 26 66 .07 14 1237 8 7.5 1924.9 5.1 64,800 4,770 26,200 6,850 225 1,950 16,600 7,500 6.3 .4 36 23 38 .06 12 1169 10 9.5 1896.0 5.0 61,800 4,800 27,100 6,920 222 2,040 17,100 7,160 5.2 .3 37 24 25 .05 13 115

11 12 11.5 1865.0 5.1 62,500 4,560 26,300 6,670 214 2,200 15,900 6,660 5.0 .3 36 23 23 .05 13 11313 14 13.5 1834.2 5.0 61,800 4,480 25,400 6,500 210 1,980 16,400 6,740 5.6 .3 36 22 22 .05 13 110

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
12 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001 10 Lake Elbert —Cont. EBT.B1 —Cont. 15 16 15.5 1803.6 5.0 63,100 4,810 26,900 7,150 224 2,020 17,200 7,220 5.7 0.3 38 25 22 -- 14 115 17 18 17.5 1773.2 4.8 63,400 4,660 26,000 6,980 219 2,060 16,400 6,870 5.4 .3 37 24 21 -- 13 115 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7 61,800 4,840 26,000 6,850 216 2,040 16,400 6,870 7.1 .5 36 26 63 0.09 13 116 11 Mills Lake MIL 0 .5 .25 2000.0 14.4 44,600 5,220 30,300 9,700 225 1,980 11,900 4,830 6.9 .6 36 35 42 .12 14 88 .5 1 .75 1996.8 12.8 49,600 6,270 23,200 10,200 738 1,820 14,000 6,310 4.7 .6 37 38 41 .12 13 85 1 1.5 1.25 1993.3 12.0 51,400 5,140 17,800 10,000 645 1,620 14,700 6,720 3.3 .7 37 30 40 .12 13 81 1.5 2 1.75 1989.8 12.7 49,100 5,280 17,500 4,640 635 1,740 13,600 5,850 3.3 .7 36 33 43 .13 13 83 2 2.5 2.25 1986.5 13.4 48,600 5,270 17,400 10,100 641 1,750 13,000 5,470 3.8 .9 36 38 47 .14 13 89 2.5 3 2.75 1983.3 13.6 47,800 4,490 16,400 9,900 621 1,610 12,800 5,250 3.8 .9 35 38 51 .15 13 89 3 3.5 3.25 1980.1 13.7 50,000 4,920 17,500 4,670 642 1,600 13,700 5,780 4.2 .9 36 34 54 .16 13 87 3.5 4 3.75 1976.9 13.3 52,200 5,040 17,600 4,860 653 1,620 14,000 5,760 3.9 1.0 37 35 56 .16 14 90 4 4.5 4.25 1973.6 13.0 51,300 4,770 17,200 4,750 652 1,570 14,100 5,720 4.0 .9 36 34 54 .18 13 89 4.5 5 4.75 1970.2 13.5 53,700 5,270 17,700 4,890 655 1,560 15,000 6,280 4.7 1.0 38 36 55 .12 14 94 5 6 5.5 1964.5 12.9 52,400 5,050 17,100 4,760 626 1,500 15,000 6,360 4.9 .9 36 32 53 .15 13 90 6 7 6.5 1956.5 11.5 58,400 5,180 17,800 4,980 661 1,570 17,500 7,670 4.5 .9 38 32 55 .12 13 90 8 9 8.5 1939.1 12.0 60,400 5,340 18,200 5,210 673 1,630 17,800 8,040 5.3 1.2 40 34 63 .13 14 99 10 11 10.5 1920.4 14.3 55,200 5,170 17,000 7,340 627 1,530 17,200 7,520 5.7 .9 34 28 60 .11 12 89 12 13 12.5 1901.8 13.2 53,900 4,870 17,500 4,910 637 1,710 15,000 6,110 6.0 .9 36 29 67 .11 13 88 14 15 14.5 1883.3 11.6 56,800 4,790 17,800 5,040 647 1,720 17,400 7,190 4.3 .6 38 28 54 .12 14 86 16 17 16.5 1865.0 12.3 54,800 4,650 17,400 4,970 631 1,820 15,100 6,020 3.4 .4 39 31 34 .11 14 83 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.0 52,200 5,140 17,500 4,980 642 1,620 14,700 6,110 4.3 .9 36 34 54 .12 13 89 12 Sloans Lake SLN.2 0 2 1 1997.2 4.2 59,800 32,400 38,400 11,700 810 1,100 18,500 6,600 13 1.2 48 88 245 .30 23 430 243 1996.1 4.2 62,800 33,400 35,900 10,200 746 1,100 18,400 6,500 16 1.1 37 81 225 .28 20 398 465 1993.6 4.5 55,900 27,600 37,100 11,200 790 1,100 18,000 6,300 14 1.0 49 80 242 .28 25 418 687 1991.0 4.3 57,300 36,200 36,900 10,200 794 1,100 18,300 6,300 15 1.1 56 81 238 .26 22 416 8 10 9 1988.7 4.3 58,300 33,900 37,800 10,500 802 1,100 18,600 6,400 16 1.0 46 84 244 .23 24 413 10 12 11 1985.4 4.1 57,600 36,400 37,100 9,800 736 1,100 18,300 6,200 17 1.1 55 81 254 .29 24 420 12 14 13 1982.2 3.8 56,800 37,100 36,400 9,300 682 1,000 18,100 6,100 16 2.1 62 81 245 .27 27 396 14 16 15 1979.1 4.0 56,000 24,700 37,200 10,200 712 1,000 18,100 6,100 16 2.1 52 81 256 .30 25 382 16 18 17 1976.1 3.6 61,800 41,400 37,700 8,800 742 1,000 18,900 6,100 17 2.1 62 88 294 .27 23 380 18 20 19 1973.0 3.4 58,900 21,100 38,400 9,500 698 1,000 18,400 5,900 16 2.0 45 88 304 .31 34 371 20 22 21 1970.1 3.3 57,900 22,000 37,100 8,800 708 960 18,200 5,800 17 2.1 49 88 306 .31 25 373

22 24 23 1967.1 3.3 61,600 22,200 39,200 10,000 756 990 18,900 6,200 19 2.5 67 92 302 .28 26 35824 26 25 1963.6 3.1 54,400 22,200 36,900 8,800 720 950 18,400 6,100 18 2.3 52 81 278 .22 26 35326 28 27 1960.2 3.0 58,700 22,000 37,100 9,300 699 920 17,800 5,900 19 2.6 50 71 254 .31 24 31128 30 29 1957.1 2.8 56,800 21,800 37,300 8,800 712 930 18,700 6,300 17 2.3 66 79 260 .33 24 311

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
Table 2 13

12 Sloans Lake

—Cont.

SLN.2

—Cont.

30 32 31 1953.8 2.5 57,600 23,000 37,200 7,150 745 920 18,500 6,300 18 1.9 52 90 234 0.35 25 310

34 36 35 1946.8 2.2 56,000 20,000 37,400 5,900 738 860 18,200 4,900 18 1.8 40 92 190 .45 27 30436 38 37 1943.2 2.2 55,700 20,700 36,900 6,100 720 860 17,600 4,700 19 1.4 52 94 192 .45 26 30040 42 41 1936.8 1.9 55,400 20,700 37,200 5,600 778 870 18,400 4,500 21 1.9 63 91 187 .43 31 29644 46 45 1929.6 2.1 52,200 19,600 36,700 6,400 764 840 17,800 4,600 21 1.6 47 96 200 .37 24 29654 56 55 1913.1 3.1 36,500 22,500 32,400 6,900 804 840 15,600 5,100 21 1.5 34 107 220 .57 24 29858 60 59 1908.1 2.9 42,100 22,400 35,500 6,300 870 840 16,300 4,800 21 1.5 44 122 269 .69 24 35362 64 63 1902.7 3.0 45,600 21,600 35,100 6,500 948 870 16,900 5,200 21 1.5 56 136 286 .78 26 35166 68 67 1897.7 2.8 78,900 83,500 36,600 13,900 914 910 18,400 7,500 21 1.5 62 144 286 1.13 24 33868 70 69 1894.9 2.4 84,500 72,700 39,200 13,900 908 940 19,300 7,900 21 1.6 57 146 294 1.17 25 33372 74 73 1889.8 2.3 97,100 54,200 40,800 15,700 816 960 21,100 8,300 21 1.4 57 163 316 1.56 24 33876 78 77 1885.2 2.0 96,200 44,400 42,100 14,900 808 950 21,800 8,700 21 1.3 44 168 311 1.69 25 34480 82 81 1878.5 1.9 78,400 37,800 36,100 11,500 764 910 20,000 8,700 21 1.4 48 145 258 1.73 24 30788 90 89 1865.3 1.5 87,300 21,900 37,400 12,200 610 1,050 21,400 9,250 21 1.2 50 34 35 .20 23 127

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0 57,600 23,000 37,100 9,500 756 950 18,400 6,200 18 1.5 52 88 254 .31 24 351

13 Lake Como CMO.1 0 5 2.5 2000.8 5.7 49,000 168,000 28,100 5,630 718 1,440 8,900 1,010 14 1.2 68 39 124 .12 29 262

5 10 7.5 1999.9 5.5 48,300 164,000 28,700 5,560 685 1,470 8,740 939 15 1.5 72 46 156 .12 31 291

10 15 12.5 1998.7 5.4 47,200 204,000 29,000 5,580 769 2,080 8,530 1,030 15 1.7 77 54 186 .13 30 29320 25 22.5 1995.3 3.6 48,800 191,000 27,400 5,640 696 1,430 8,920 913 16 1.3 74 34 195 .14 29 21730 35 32.5 1990.6 3.4 39,700 203,000 22,200 4,710 565 1,070 7,960 1,100 12 1.3 91 34 410 .14 26 19945 50 47.5 1982.5 3.3 35,100 204,000 20,200 4,350 504 968 7,290 1,070 10 1.0 70 32 241 .15 25 17160 65 62.5 1974.1 2.5 53,000 205,000 27,800 5,990 682 1,130 10,700 750 13 .9 77 30 159 .10 30 16475 80 77.5 1969.1 5.2 47,500 178,000 29,200 5,500 745 1,810 8,320 796 17 2.3 118 46 1,220 .17 30 31990 95 92.5 1958.6 2.8 55,800 179,000 31,000 6,170 828 1,170 9,060 734 18 1.2 120 24 303 .09 31 168

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6 48,300 191,000 28,100 5,580 696 1,430 8,740 939 15 1.3 77 34 195 .13 30 217

14 Echo Lake ECO.1 0 5 2.5 1999.7 3.5 56,800 99,500 31,600 7,910 728 1,020 8,660 1,140 16 3.2 71 39 125 .11 30 292

5 10 7.5 1998.3 3.6 58,200 109,000 32,500 7,420 685 1,040 8,830 1,070 16 4.8 75 46 144 .14 32 352

10 15 12.5 1996.4 3.6 56,500 110,000 32,000 6,920 633 982 9,070 987 16 4.2 73 39 129 .13 30 30520 25 22.5 1991.7 3.7 61,400 111,000 31,000 8,150 634 832 9,680 1,130 16 6.6 74 39 165 .15 31 27630 35 32.5 1985.9 3.9 58,800 114,000 31,100 7,810 668 915 8,940 1,010 19 54.7 101 44 303 .14 29 51940 45 42.5 1980.6 3.9 58,200 113,000 31,800 8,010 673 964 9,120 1,110 19 16.1 84 43 464 .14 30 32255 60 57.5 1972.5 3.9 56,500 113,000 31,400 8,170 729 1,160 8,970 1,070 21 33.0 136 43 706 .15 32 31565 70 67.5 1966.8 3.4 63,100 96,700 32,800 8,950 728 1,570 10,400 1,200 20 182 240 54 305 .14 38 35175 80 77.5 1961.1 3.5 59,100 100,000 32,300 8,610 771 1,500 8,550 953 20 80.8 114 45 307 .12 29 21590 97 93.5 1951.4 2.9 64,700 76,600 34,300 9,710 791 750 9,780 1,240 18 2.0 70 25 111 .09 27 129

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6 58,500 110,000 31,900 8,080 706 999 9,020 1,090 18 11 79 43 234 .14 30 310

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
14 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001 15 Fosdic Lake FOS.4 0 5 2.5 2000.4 2.7 49,400 88,300 28,400 4,540 830 1,520 6,940 1,060 12 1.7 76 37 109 0.24 24 211 5 10 7.5 1998.4 2.6 47,600 84,900 26,900 4,540 774 1,500 6,880 1,080 12 2.1 74 48 129 .28 24 247 10 15 12.5 1996.2 2.5 42,500 83,400 19,200 3,950 570 1,300 6,700 1,000 11 2.3 71 42 140 .31 23 244 20 25 22.5 1991.0 2.2 46,900 72,600 25,500 4,410 517 1,310 7,120 1,110 12 2.8 81 44 196 .37 24 248 30 35 32.5 1983.3 2.7 52,300 84,900 27,200 4,720 494 1,140 7,780 1,040 13 3.7 86 45 285 .41 27 218 45 50 47.5 1968.9 2.6 60,700 85,000 31,600 5,100 592 1,260 9,390 1,160 15 4.1 96 40 379 .55 29 206 55 60 57.5 1959.8 3.0 60,500 93,100 31,100 5,100 573 780 8,150 1,060 220 .9 66 21 242 .16 26 130 70 75 72.5 1944.6 1.9 69,400 67,900 36,900 5,160 834 666 8,960 1,130 32 .5 71 20 89 .09 28 100 85 90 87.5 1928.3 2.3 72,000 67,000 36,500 5,350 566 633 9,640 1,140 28 .2 73 16 39 .06 28 87 100 105 102.5 1912.6 2.0 66,600 42,100 30,800 5,430 520 547 8,570 1,320 21 .2 64 16 27 .04 25 70 105 112 108.5 Pre-res. 2.2 52,200 41,200 27,100 3,920 446 475 8,240 1,120 12 .1 55 14 20 .04 22 53 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 52,300 83,400 28,400 4,720 570 1,140 8,150 1,110 12 1.7 73 37 129 .24 25 206 16 White Rock Lake WRL2.2 0 1.5 .75 1996.1 2.5 54,400 134,000 26,100 6,200 1,060 1,200 6,500 580 8.1 .2 61 12 21 .06 31 104 1.5 3 2.25 1995.2 2.3 53,500 126,000 23,000 5,950 935 1,050 6,650 605 9.2 .1 64 14 22 .05 31 116 3 4.5 3.75 1994.3 2.2 49,200 128,000 25,200 6,000 866 1,200 6,700 490 9.0 .2 58 11 21 .05 32 141 4.5 6 5.25 1993.4 2.2 50,800 125,000 27,400 6,600 916 1,100 6,900 560 10 .1 61 13 23 .05 33 148 6 7.5 6.75 1992.5 2.0 49,400 122,000 26,300 6,600 832 1,200 6,800 510 10 .2 60 12 21 .06 36 148 7.5 9 8.25 1991.6 2.1 45,800 123,000 23,200 6,600 794 1,100 6,600 540 9.1 .2 63 12 21 .07 34 150 9 10.5 9.75 1990.7 2.1 47,600 119,000 26,200 6,400 796 1,150 6,900 515 7.0 .2 61 12 22 .07 34 142 10.5 12 11.25 1989.8 2.0 51,000 126,000 23,900 6,400 840 1,000 6,900 570 11 .2 60 15 22 .09 31 139 12 13.5 12.75 1988.8 3.0 51,200 125,000 23,800 6,300 860 1,100 6,900 570 11 .2 65 12 34 .08 34 154 13.5 15 14.25 1987.9 2.0 53,200 129,000 28,300 6,700 888 1,000 7,100 550 12 .2 68 13 31 .08 34 149 15 16.5 15.75 1987.0 1.9 56,200 128,000 26,400 6,800 936 1,200 7,000 610 9.0 .2 67 12 34 .09 35 150 16.5 18 17.25 1986.1 2.0 55,200 121,000 26,400 6,800 962 1,100 7,200 540 10 .2 64 13 29 .09 39 151 18 19.5 18.75 1985.2 2.1 51,400 121,000 27,200 6,700 950 1,100 6,900 590 11 .2 64 13 39 .09 40 164 19.5 21 20.25 1984.3 2.0 49,600 106,000 27,100 6,600 930 1,200 7,100 490 11 .2 61 12 42 .09 36 160 21 22.5 21.75 1983.4 2.0 54,000 126,000 26,500 6,800 964 1,100 7,100 510 8.7 .2 56 13 44 .08 39 148 22.5 24 23.25 1982.5 2.2 55,600 125,000 26,300 6,900 960 1,100 6,800 580 10 .2 56 13 57 .08 36 154 24 25.5 24.75 1981.6 2.0 53,500 128,000 28,400 6,850 936 1,100 7,200 475 10 .2 57 11 54 .07 37 144 25.5 27 26.25 1980.7 1.8 63,600 135,000 26,700 7,100 994 1,100 6,500 580 9.1 .2 66 12 64 .06 38 142 27 28.5 27.75 1979.8 1.9 69,200 144,000 27,400 7,750 952 1,200 6,550 580 8.9 .2 65 11 66 .06 37 141 28.5 30 29.25 1978.9 2.0 67,600 147,000 27,500 7,100 918 1,100 7,200 560 11 .2 58 10 78 .07 36 138 Table 2. Concentrations of selected major and trace elements in sediment cores—Continued. Map ID (fig. 1) Lake name Core ID Interval (centimeters) Esti- mated deposi- tion date1 Organic carbon (percent) Alu- minum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
Table 2 15

16 White Rock 

Lake—Cont.

WRL2.2

—Cont.

30 31.5 30.75 1978.0 2.1 60,200 128,000 30,200 7,300 930 1,200 7,500 560 11 0.2 62 12 78 0.06 34 132

31.5 33 32.25 1977.1 2.1 62,600 129,000 29,200 7,200 902 1,000 7,200 540 11 .2 58 13 72 .06 33 13833 34.5 33.75 1976.2 2.1 61,200 119,000 29,100 7,200 904 1,000 7,400 490 11 .2 68 11 78 .06 35 13234.5 36 35.25 1975.3 1.8 60,200 127,000 31,400 7,800 908 1,000 7,900 510 11 .2 67 12 73 .06 37 14036 37.5 36.75 1974.4 1.2 60,600 124,000 28,600 7,800 918 1,100 7,700 520 10 .2 77 12 83 .06 39 13837.5 39 38.25 1973.5 1.7 60,600 123,000 28,100 7,400 884 1,200 7,600 540 11 .2 76 11 89 .06 38 14539 40.5 39.75 1972.3 1.8 61,600 121,000 28,700 7,700 902 1,100 7,700 530 12 .2 78 12 80 .06 41 14440.5 42 41.25 1971.1 2.0 66,200 115,000 28,800 7,400 880 1,100 7,400 580 12 .2 80 13 76 .07 41 14242 43.5 42.75 1969.9 1.8 70,500 122,000 32,100 8,900 910 1,200 8,400 610 12 .2 83 16 74 .07 41 14443.5 45 44.25 1968.7 1.9 66,600 123,000 29,600 7,500 878 1,100 7,600 590 11 .2 81 12 69 .06 43 14645 46.5 45.75 1967.5 1.9 70,000 121,000 32,400 8,100 964 1,200 8,100 690 11 .2 88 14 64 .06 43 14446.5 48 47.25 1966.2 1.8 65,800 129,000 28,600 7,500 904 1,100 7,500 640 12 .2 77 16 51 .07 41 14648 49.5 48.75 1965.0 2.0 68,200 125,000 28,700 7,800 886 990 7,800 620 10 .2 76 12 45 .06 40 14049.5 51 50.25 1963.8 2.0 68,600 125,000 30,300 7,100 844 950 7,600 920 9.1 .2 72 14 26 .05 39 12351 52.5 51.75 1962.6 1.7 66,200 127,000 26,800 7,400 836 1,100 7,600 560 10 .2 75 12 23 .06 39 13452.5 54 53.25 1961.4 1.8 66,200 127,000 30,400 7,700 884 920 7,500 510 10 .2 70 11 23 .06 34 13254 55.5 54.75 1960.2 1.9 66,800 114,000 32,400 8,100 852 990 8,100 560 11 .2 76 12 25 .06 42 13355.5 57 56.25 1959.0 1.8 73,700 105,000 35,700 9,000 868 925 8,650 520 10 .2 76 13 19 .05 41 13757 58.5 57.75 1957.8 1.8 68,400 107,000 33,100 8,200 876 840 8,200 690 11 .2 75 14 19 .05 37 14058.5 60 59.25 1956.6 1.7 69,200 109,000 26,900 6,800 888 980 7,900 650 11 .2 76 14 19 .05 39 12660 61.5 60.75 1955.4 2.0 79,000 98,400 32,500 8,900 896 860 9,400 620 12 .2 76 14 17 .04 43 13861.5 63 62.25 1954.1 3.9 75,200 98,000 33,600 8,650 879 805 8,650 500 10 .2 74 13 15 .04 40 13863 64.5 63.75 1952.9 2.1 74,600 96,500 37,300 9,200 938 860 8,400 520 12 .2 75 13 14 .04 41 12964.5 66 65.25 1951.7 2.1 78,800 98,700 26,700 7,600 934 760 8,500 580 11 .2 75 13 14 .05 43 12266 67.5 66.75 195.5 1.7 81,600 97,300 39,100 9,400 910 860 8,800 540 11 .2 73 13 14 .05 43 14267.5 69 68.25 1949.3 2.1 79,100 98,300 37,300 8,800 864 860 8,400 610 11 .2 75 15 14 .04 43 13569 70.5 69.75 1948.0 1.8 78,200 97,100 33,400 8,400 954 760 8,500 520 11 .2 71 13 14 .04 42 13470.5 72 71.25 1946.6 1.8 78,400 98,600 37,600 9,200 912 860 9,200 490 11 .2 78 14 14 .05 41 13372 73.5 72.75 1945.3 1.8 78,600 99,200 34,400 8,900 934 820 9,100 480 11 .2 74 15 14 .05 41 14073.5 75 74.25 1943.9 1.9 80,400 99,300 39,100 9,300 839 880 9,100 530 11 .2 77 15 15 .05 43 14575 76.5 75.75 1942.5 2.1 79,500 98,200 36,400 8,400 866 840 8,600 740 11 .2 75 14 18 .05 41 13276.5 78 77.25 1941.2 2.1 80,800 98,400 31,400 7,100 864 810 8,100 710 11 .2 77 14 16 .05 40 12878 79.5 78.75 1939.8 1.9 80,600 99,300 28,400 7,900 900 840 8,700 810 11 .2 71 14 18 .05 37 13279.5 81 80.25 1938.5 1.7 81,200 105,000 34,400 8,950 908 925 9,150 530 11 .2 80 13 19 .05 40 14481 82.5 81.75 1937.1 1.6 74,400 102,000 35,200 8,600 960 840 8,700 460 11 .2 69 14 18 .04 38 125

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
16 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001 16 White Rock Lake—Cont. WRL2.2 —Cont. 82.5 84 83.25 1935.7 1.6 74,000 107,000 32,400 8,600 900 910 8,700 490 11 0.2 66 13 16 0.05 40 128 84 85.5 84.75 1934.4 1.8 71,200 105,000 36,200 8,800 898 880 8,800 490 11 .2 66 14 15 .05 42 132 85.5 87 86.25 1933.0 1.8 70,600 116,000 34,500 8,600 920 920 8,200 450 13 .2 67 14 15 .04 41 134 87 88.5 87.75 1931.6 1.6 71,400 125,000 35,400 8,800 944 850 8,700 460 11 .2 71 13 17 .05 38 128 88.5 90 89.25 1930.3 1.9 75,400 119,000 32,200 9,100 936 920 9,100 540 11 .2 73 16 16 .04 41 136 90 91.5 90.75 1928.9 1.8 76,500 114,000 33,600 9,200 861 945 9,250 485 12 .2 72 13 13 .04 40 140 91.5 93 92.25 1927.5 1.9 76,600 113,000 34,800 8,700 828 910 8,400 490 11 .2 69 13 11 .04 38 133 93 94.5 93.75 1926.2 2.1 74,200 123,000 31,200 7,900 824 820 8,300 640 11 .2 64 12 12 .05 37 128 94.5 96 95.25 1924.5 1.9 75,900 110,000 36,500 9,400 828 940 9,500 490 11 .2 68 14 12 .04 34 138 96 97.5 96.75 1922.7 1.9 65,900 116,000 33,200 8,250 783 890 8,400 530 11 .2 63 12 16 .04 38 131 97.5 99 98.25 1921.0 1.8 64,800 115,000 31,400 8,700 782 940 9,100 520 11 .2 69 12 11 .04 39 132 99 100.5 99.75 1919.2 2.1 64,100 128,000 33,400 8,900 758 1,000 8,900 520 11 .2 68 11 11 .04 37 134 100.5 102 101.25 1917.5 1.7 50,000 123,000 23,500 7,200 732 840 8,100 690 10 .2 68 10 11 .04 32 120 102 103.5 102.75 1915.7 1.9 50,200 125,000 24,900 7,400 694 940 8,400 610 8.9 .1 62 11 11 .04 36 118 103.5 105 104.25 1914.0 1.7 37,400 117,000 18,100 6,700 648 840 6,700 960 10 .1 58 8.5 11 .04 30 84 111 112.5 111.75 Pre-res. 1.7 27,600 108,000 12,600 4,800 648 640 4,800 760 10 .1 32 6.0 10 <.04 25 66 114 115.5 114.75 Pre-res. 1.6 26,400 104,000 15,800 4,200 630 660 5,400 820 10 .1 42 8.4 11 <.04 28 62 109.5 111 110.25 Pre-res. 1.4 27,400 117,000 13,200 3,900 652 620 5,100 740 10 .1 32 7.9 11 <.04 24 70 108 109.5 108.75 Pre-res. 1.2 28,800 118,000 14,300 3,800 666 610 4,400 850 11 .1 27 6.4 10 <.04 25 67 112.5 114 113.25 Pre-res. 1.4 27,800 105,000 18,200 4,200 664 660 5,100 710 10 .1 42 8.2 10 <.04 26 67 106.5 108 107.25 Pre-res. 1.9 28,300 112,000 14,100 4,500 660 760 4,600 880 9.0 .1 35 7.4 9.5 <.04 23 72 105 106.5 105.75 Pre-res. 2.8 36,200 122,000 13,800 4,650 671 830 5,650 810 10 .1 44 8.0 8.0 <.04 24 66 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.9 66,400 121,000 29,400 7,700 899 990 7,900 540 11 .2 69 13 21 .05 38 138 17 Town Lake TWN 0 5 2.5 1998.1 -- 47,300 173,000 23,800 13,100 856 680 13,100 2,110 7.8 .5 52 33 54 -- 24 112 10 15 12.5 1995.0 -- 47,900 177,000 23,800 13,300 775 670 13,100 2,010 7.8 .5 54 38 68 -- 25 114 20 25 22.5 1991.5 -- 46,700 179,000 23,300 12,900 769 670 12,900 1,900 7.8 .5 54 34 72 -- 26 113 30 35 32.5 1987.9 -- 50,900 191,000 25,300 13,200 892 670 13,300 1,570 8.3 .5 56 35 83 -- 26 112 40 45 42.5 1984.0 -- 46,300 196,000 22,800 13,800 901 630 12,500 1,670 7.9 .4 52 30 76 -- 24 96 50 55 52.5 1979.9 -- 51,300 183,000 24,600 11,900 920 700 13,400 1,350 7.9 .5 56 30 80 -- 26 106 60 65 62.5 1976.1 -- 49,800 192,000 24,400 13,500 851 670 12,800 1,520 8.6 .5 57 40 126 -- 28 113 70 75 72.5 1972.1 -- 43,500 200,000 20,700 14,100 754 620 11,300 1,600 8.2 .5 51 26 138 -- 24 97 80 85 82.5 1968.2 -- 48,600 178,000 23,800 13,900 833 610 13,000 2,160 8.9 .5 55 40 191 -- 26 116 90 95 92.5 1964.0 -- 53,600 199,000 25,800 13,200 835 670 13,000 1,550 8.0 .6 62 38 176 -- 32 125

100 105 102.5 1961.1 -- 62,700 164,000 29,000 13,300 759 650 15,300 1,930 8.6 .6 68 47 187 -- 30 134110 115 112.5 1955.0 -- 45,000 129,000 19,300 12,800 505 450 17,500 6,030 3.9 .2 38 21 28 -- 18 50

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -- 48,200 181,000 23,800 13,200 834 670 13,000 1,780 7.9 .5 54 35 82 -- 26 112

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
Table 2 17

18 Lake 

Houston 

HOS.2 0 4 2 1996.5 -- 81,200 5,990 40,500 5,650 2,280 1,680 7,880 1,000 10 0.2 74 23 39 0.12 28 104

486 1994.4 -- 78,300 4,750 39,100 5,330 2,460 1,640 7,400 900 10 .2 71 21 42 .07 27 948 12 10 1992.2 -- 85,700 5,100 40,800 5,600 1,820 1,180 7,970 900 8.0 .2 78 23 40 .07 28 103

12 16 14 1990.1 -- 85,600 4,920 39,000 5,700 1,440 1,060 7,660 900 7.6 .2 78 21 42 .07 27 10316 20 18 1987.9 -- 86,600 4,960 38,600 5,680 1,390 800 7,730 900 8.0 .2 79 22 44 .09 28 10420 24 22 1985.8 -- 82,000 5,130 39,200 5,350 1,840 1,520 7,530 1,000 8.0 .2 75 21 40 .06 27 9624 28 26 1983.6 -- 83,100 4,960 41,700 5,530 2,080 1,900 7,290 900 9.0 .2 76 22 42 .08 29 10028 32 30 1981.5 -- 85,900 5,240 41,300 5,470 1,870 1,620 7,600 900 10 .2 78 21 47 .08 28 10232 36 34 1979.3 -- 86,200 5,280 42,100 5,370 2,010 1,710 7,610 900 10 .2 77 25 46 .07 28 10136 40 38 1977.2 -- 84,500 5,120 40,900 5,430 1,760 1,230 7,290 900 11 .2 79 55 51 .08 29 10240 44 42 1975.0 -- 89,400 5,520 42,600 5,460 1,800 1,000 8,190 1,000 10 .2 78 20 54 .07 29 9644 48 46 1972.9 -- 84,400 4,930 40,000 5,550 1,690 900 7,470 900 8.4 .2 79 20 53 .08 29 9748 52 50 1970.7 -- 87,600 5,330 40,900 5,860 1,760 800 8,150 900 8.0 .2 78 21 49 .06 29 9752 56 54 1968.6 -- 86,000 5,180 39,900 5,980 1,740 700 7,750 900 7.9 .2 77 22 49 .07 29 9656 60 58 1966.4 -- 89,500 5,350 42,200 6,090 1,800 800 7,880 900 10 .2 80 22 45 .07 30 9960 64 62 1964.3 -- 89,000 8,480 40,300 6,530 1,610 600 9,070 1,030 7.9 .2 75 22 34 .05 28 9064 68 66 1962.1 -- 79,600 4,920 37,000 5,480 2,740 600 7,610 1,040 9.4 .2 71 21 36 .06 27 8968 72 70 1960.0 -- 44,100 2,470 18,800 2,560 759 300 6,630 1,220 4.0 <.1 40 10 20 <.02 12 3872 76 74 1957.8 -- 17,000 900 6,520 900 258 90 5,300 900 1.0 <.1 15 4.0 11 .02 4.0 2088 92 90 1949.2 -- 77,800 58,500 37,700 14,400 546 500 21,100 2,920 7.8 .1 70 18 21 <.02 33 70

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -- 85,000 5,120 40,200 5,540 1,780 950 7,640 900 8.2 .2 77 21 42 .07 28 97

19 Palmer Lake PLM.W2 0 2 1 1996.8 11.6 22,500 92,200 38,800 8,200 3,270 1,500 4,300 4,000 18 .3 48 22 150 .16 47 246

243 1995.1 10.6 23,900 110,000 36,000 9,000 3,460 1,300 5,000 4,600 15 .3 49 21 144 .14 45 222465 1993.4 12.5 23,600 110,000 37,000 8,500 3,370 1,400 5,100 4,400 16 .3 39 20 142 .16 44 210687 1991.6 12.3 23,400 116,000 35,800 8,400 3,290 1,300 4,800 4,300 16 .3 49 19 152 .12 44 2088 10 9 1989.6 11.5 23,200 117,000 35,600 8,250 3,210 1,350 5,350 4,200 14 .3 48 19 150 .15 42 190

10 12 11 1987.5 11.4 23,600 107,000 36,800 8,000 3,270 1,400 5,800 4,000 15 .3 45 18 164 .15 44 18212 14 13 1985.4 11.8 24,400 111,000 36,200 8,100 3,320 1,300 6,200 4,100 14 .3 49 20 187 .13 43 17014 16 15 1983.4 11.5 25,600 109,000 36,600 7,900 3,260 1,300 6,400 4,000 17 .3 44 19 200 .15 43 16116 18 17 1981.3 11.1 22,500 101,000 35,400 7,600 3,300 1,300 6,600 3,900 18 .3 52 20 210 .12 44 14918 20 19 1979.2 11.3 27,500 109,000 36,200 8,000 3,520 1,200 4,800 4,100 14 .3 54 22 216 .14 44 17620 22 21 1977.0 11.0 25,600 112,000 35,500 7,800 3,450 1,400 4,600 3,900 16 .3 47 19 207 .12 45 15722 24 23 1974.8 11.5 21,800 112,000 35,900 7,500 3,580 1,300 4,400 3,700 11 .3 34 18 207 .12 49 16024 26 25 1972.6 11.2 23,200 111,000 34,400 7,550 3,470 1,350 4,700 3,800 11 .3 32 18 205 .11 47 14626 28 27 1970.4 11.2 22,500 113,000 32,800 7,100 3,250 1,300 4,700 3,500 12 .3 29 16 186 .13 48 13328 30 29 1968.2 11.3 18,400 112,000 31,900 6,900 3,360 1,400 4,300 3,200 14 .2 27 15 182 .10 48 133

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
18 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001 19 Palmer Lake —Cont. PLM.W2 —Cont. 30 32 31 1966.1 11.1 17,500 119,000 30,100 6,800 3,470 1,100 4,200 2,900 9.3 0.2 38 15 167 0.10 45 121 32 34 33 1964.0 11.6 20,800 107,000 30,400 7,000 3,100 1,200 5,200 3,200 10 .3 35 17 161 .13 48 117 34 36 35 1962.0 12.1 25,600 108,000 32,600 7,200 3,080 1,200 4,500 3,600 9.4 .2 35 20 156 .14 49 164 36 38 37 1960.0 11.9 15,400 110,000 25,800 6,600 3,200 1,200 3,500 2,800 10 <.2 29 17 154 .10 47 140 38 40 39 1958.0 7.3 <200 117,000 14,500 3,600 3,070 800 <2,000 -- 7.3 <.2 5.3 <2.0 4.1 <.04 5.5 21 40 42 41 1955.9 5.7 <200 106,000 11,800 3,800 2,850 670 <2,000 -- 4.4 <.2 5.5 <2.0 <2.0 <.04 <2.0 10 42 44 43 1953.4 5.1 <200 123,000 12,000 4,300 3,200 600 <2,000 -- 3.4 <.2 1.8 <2.0 <2.0 <.04 <2.0 11 44 46 45 1950.9 5.8 <200 120,000 12,600 4,200 2,370 610 <2,000 -- 3.6 <.2 2.0 <2.0 <2.0 <.04 2.3 8.2 46 48 47 1948.3 5.7 <200 118,000 11,100 4,600 2,470 560 <2,000 -- 3.6 <.2 3.2 <2.0 <2.0 <.04 2.4 8.8 48 50 49 1945.7 6.1 <200 115,000 11,200 4,100 1,990 570 <2,000 -- 3.0 <.2 3.0 <2.0 <2.0 <.04 <2.0 10 50 52 51 1943.1 7.3 <200 120,000 11,400 5,400 1,960 540 <2,000 -- 3.0 <.2 3.1 <2.0 <2.0 <.04 <2.0 11 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.3 23,200 111,000 33,600 7,350 3,260 1,300 4,800 3,650 12 .3 35 19 166 .13 45 148 20 Lake Harriet HAR.3 0 2 1 1995.6 12.2 15,000 86,500 16,000 8,500 994 1,150 5,000 3,400 42 .3 12 30 167 .13 22 250 243 1990.6 12.0 21,000 86,000 12,000 8,000 1,020 800 5,000 2,800 41 .2 18 52 168 .13 14 211 465 1985.6 11.8 15,000 68,000 14,000 8,200 990 1,000 5,000 3,200 52 .3 12 27 206 .12 21 239 687 1981.3 10.3 19,000 92,000 10,500 8,550 1,010 750 5,000 2,600 57 .2 12 35 208 .13 20 192 8 10 9 1976.5 9.5 26,000 103,000 13,000 9,100 1,180 900 6,000 3,400 72 .2 97 47 395 .15 23 330 10 12 11 1971.5 10.8 23,000 66,000 15,000 8,800 1,070 1,200 7,000 4,000 62 .3 52 34 315 .15 30 370 12 14 13 1965.9 8.4 24,000 76,000 15,000 9,400 1,080 900 8,000 3,400 69 .2 14 44 247 .15 29 258 14 16 15 1959.2 8.9 31,000 78,000 18,000 9,200 1,060 800 8,000 3,700 37 .2 15 55 229 .14 25 273 16 18 17 1952.6 11.1 33,000 86,000 20,000 8,700 1,010 1,200 6,000 3,900 32 .3 15 37 147 .13 25 273 22 24 23 1930.6 8.4 40,000 111,000 23,000 8,900 1,050 900 7,000 3,600 15 .3 14 30 71 .11 22 233 28 30 29 1909.7 8.1 31,000 87,000 30,000 7,400 1,770 800 5,000 3,400 14 .2 9.0 17 34 .08 17 104 34 36 35 1885.6 11.5 20,000 112,000 27,000 7,500 1,510 1,700 4,000 2,300 13 <.2 6.0 9.0 19 .08 11 51 40 42 41 1851.2 13.0 6,500 92,000 24,500 6,500 1,320 1,850 2,000 1,850 9.0 <.2 4.5 4.0 4.0 .03 7.0 34 46 48 47 1830.0 13.0 6,000 92,000 33,000 6,600 1,470 1,200 2,000 1,500 8.0 <.2 3.0 3.0 4.0 <.04 7.0 37 52 54 53 1790.8 10.3 7,000 82,000 17,000 6,400 952 1,700 2,000 1,300 6.0 <.2 3.0 2.0 3.0 <.04 7.0 29 58 60 59 -- 9.0 7,000 73,000 15,000 6,100 836 900 2,000 1,300 6.0 <.2 1.0 3.0 3.0 <.04 7.0 32 64 66 65 -- 10.2 5,000 67,000 13,000 5,900 673 800 2,000 1,400 5.0 <.2 1.0 3.0 2.0 <.04 6.0 27 70 72 71 -- 8.0 10,000 64,000 10,000 5,900 660 700 2,000 1,500 4.0 <.2 1.0 4.0 2.0 <.04 8.0 30 76 78 77 -- 9.9 15,000 72,000 12,000 8,200 608 700 4,000 2,200 3.9 <.2 1.0 4.0 2.0 <.04 10 40 82 84 83 -- 8.8 9,000 64,000 10,000 6,500 681 800 2,000 1,550 3.1 <.2 1.0 3.0 2.0 <.04 9.0 36 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.8 21,000 86,500 17,000 8,500 1,060 1,000 5,000 3,400 37 .2 12 30 167 .13 21 233 Table 2. Concentrations of selected major and trace elements in sediment cores—Continued. Map ID (fig. 1) Lake name Core ID Interval (centimeters) Esti- mated deposi- tion date1 Organic carbon (percent) Alu- minum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
Table 2 19

21 Lake in the 

Hills

LKH.1 0 2 1 2001.2 4.4 59,600 79,500 41,200 19,800 896 1,200 21,800 4,390 17 0.5 70 42 27 0.07 36 132

243 2000.4 4.6 64,400 74,700 41,900 20,000 992 1,250 22,900 3,980 17 .5 74 44 28 .07 36 139465 1999.5 4.5 64,400 75,600 43,500 20,100 968 1,190 22,600 3,810 22 .5 72 42 27 .06 36 131687 1998.6 3.9 69,300 63,000 44,000 21,500 905 1,180 25,200 3,420 18 .5 79 44 29 .06 40 138

10 12 11 1996.0 2.7 79,800 44,400 47,900 25,100 891 1,250 30,200 3,010 16 .4 91 43 26 .06 46 13414 16 15 1993.1 3.5 70,200 72,600 41,800 19,800 915 1,380 25,000 2,470 17 .5 79 40 28 .05 39 13418 20 19 1990.2 3.9 60,000 98,100 39,900 17,600 910 1,370 21,100 2,330 24 .5 67 37 28 .07 35 12023 26 24.5 1986.0 4.6 59,200 82,000 37,900 14,800 988 1,850 19,400 2,300 27 .6 65 36 33 .05 33 12329 32 30.5 1981.3 4.6 62,300 76,800 40,700 15,000 961 1,720 19,800 2,300 32 .7 68 38 37 .07 34 13138 41 39.5 1974.4 4.6 65,200 68,500 42,000 16,300 977 1,350 21,300 2,300 47 .6 72 42 44 .07 36 13447 50 48.5 1966.8 4.4 58,900 90,500 38,700 16,400 994 1,220 19,900 2,450 90 .7 63 43 43 .07 32 12758 62 60 1957.9 4.5 66,100 60,200 44,000 16,000 884 1,170 21,900 2,570 106 .6 71 37 38 .06 36 13174 78 76 1942.3 3.6 73,200 31,000 42,800 18,200 700 1,080 26,100 3,380 13 .4 76 37 25 .04 36 11482 86 84 Pre-res. 2.5 35,200 38,600 17,600 21,000 458 524 16,200 5,400 4.8 .2 30 14 13 .03 15 41

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4 64,400 74,700 41,900 18,200 915 1,250 21,900 2,570 22 .5 72 42 28 .06 36 131

22 Beck Lake BEC-1 0 1 .5 2001.5 4.6 71,000 37,200 38,600 23,600 619 951 26,700 5,740 18 .6 81 55 48 .07 40 138

1 2 1.5 2001.1 4.5 71,000 38,400 39,600 22,400 626 999 26,800 5,220 21 .6 85 55 47 .07 41 1412 3 2.5 2000.6 4.4 71,000 37,300 39,000 23,100 630 901 26,600 5,560 17 .6 83 56 46 .07 40 1404 5 4.5 1999.5 4.4 71,600 37,200 38,900 24,300 577 934 26,200 5,440 21 .6 81 56 46 .06 40 1426 7 6.5 1998.4 4.2 73,300 38,500 39,100 24,700 577 910 27,700 5,340 23 .6 84 56 48 .07 41 1428 10 9 1996.7 3.9 72,100 40,100 40,300 23,900 585 872 27,100 5,110 26 .6 84 55 49 .07 41 140

12 14 13 1993.9 3.5 74,000 40,400 41,600 23,000 567 802 27,700 4,760 29 .6 87 53 51 .07 43 13916 18 17 1990.7 3.3 75,000 33,500 40,400 25,700 569 776 28,400 5,190 28 .6 89 56 57 .07 43 14322 24 23 1985.1 3.0 79,200 31,400 41,400 25,900 566 738 29,300 5,000 30 .7 90 47 63 .07 45 14730 33 31.5 1976.0 2.9 74,400 33,300 39,500 25,300 564 677 28,500 4,770 40 .7 86 46 72 .07 44 14639 42 40.5 1965.1 2.7 72,200 39,500 38,000 29,700 576 640 27,600 5,220 48 .7 81 42 71 .06 41 14142 45 43.5 1959.3 1.2 52,800 69,700 29,300 45,900 621 418 23,800 5,200 23 .2 55 27 25 .02 32 74

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.7 72,200 37,800 39,300 24,500 577 837 27,300 5,210 24 .6 84 55 48 .07 41 141

23 Shoe Factory 

Road Pond 

SHO.2 0 1 .5 1993.6 -- 57,700 9,840 31,000 8,970 439 1,160 24,200 3,680 7.9 .8 66 33 48 .12 31 140

1 2 1.5 1991.6 -- 56,400 9,590 30,400 8,540 433 1,130 24,000 3,740 7.8 .7 62 31 48 .11 31 1362 3 2.5 1989.5 11.0 57,800 8,960 30,700 8,050 427 1,110 24,200 3,570 7.9 .8 63 31 49 .11 31 137

3 4 3.5 1986.7 -- 57,200 8,620 30,500 8,280 408 1,020 24,300 3,670 8.0 .8 61 31 48 .09 32 136

4 5 4.5 1984.3 -- 58,100 8,450 30,200 8,710 396 991 24,100 3,850 7.8 .8 65 32 48 .11 32 138

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
20 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001 23 Shoe Factory Road Pond —Cont. SHO.2 —Cont. 5 6 5.5 1981.8 9.8 58,500 8,550 31,000 8,410 402 950 24,800 3,680 8.3 0.8 66 32 51 0.10 32 140 6 7 6.5 1979.1 9.7 59,300 8,570 32,300 8,680 411 924 25,100 3,770 9.4 .8 66 33 53 .10 34 141 7 8 7.5 1976.4 9.7 60,600 8,690 32,000 9,040 402 937 24,600 3,680 10 .8 65 33 51 .11 33 145 8 9 8.5 1973.6 9.2 62,400 8,940 33,800 8,870 409 931 26,300 3,610 10 .8 69 34 57 .10 35 149 9 10 9.5 1970.6 8.7 61,200 8,580 33,300 9,360 395 871 24,900 3,720 11 .8 66 32 53 .10 34 145 10 12 11 1964.5 9.0 62,600 9,380 35,400 9,210 410 921 26,100 3,600 11 .9 69 33 59 .10 37 150 12 14 13 1958.0 9.3 60,800 9,810 35,600 9,540 424 1,100 24,900 3,710 12 .8 68 32 53 .10 35 143 14 16 15 1950.3 8.2 66,800 9,990 39,300 9,820 455 1,080 28,000 3,420 12 .9 76 34 58 .10 39 158 18 20 19 1932.1 6.9 65,200 7,590 35,700 8,700 401 1,220 25,500 4,260 13 .9 69 33 40 .08 36 151 24 28 26 1892.5 4.2 76,500 5,790 40,300 8,780 394 1,290 30,100 3,730 8.1 .9 84 37 37 .07 42 158 32 36 34 1863.4 4.2 75,400 5,520 38,300 9,120 336 1,170 28,700 3,830 8.8 .7 82 37 32 .06 40 150 40 44 42 1801.2 3.8 79,000 5,430 38,700 9,600 318 1,160 30,000 3,510 6.8 .6 88 39 30 -- 41 155 64 68 66 -- 3.9 72,800 5,820 27,800 8,030 259 832 28,500 4,330 5.1 .5 79 36 23 .05 30 144 48 52 50 -- 3.3 78,300 5,470 34,900 8,420 294 1,170 31,400 4,260 4.1 .4 86 34 27 .05 36 139 56 60 58 -- 4.3 75,400 5,890 29,300 8,040 257 819 28,700 3,930 4.4 .5 83 37 25 .06 31 151 80 84 82 -- 3.8 72,200 5,890 25,600 7,630 286 839 28,000 3,770 4.8 .6 76 38 24 .07 28 152 72 76 74 -- 3.3 74,400 5,970 25,900 7,290 252 778 29,500 3,610 4.6 .6 77 37 26 .05 27 152 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.0 60,800 8,620 33,300 8,870 408 1,080 24,900 3,680 8.8 .8 66 33 49 .10 34 145 24 Berkeley Lake BRK 0 1 .5 1999.1 13.4 62,000 1,700 84,000 1,500 1,910 2,500 8,000 1,000 32 1.8 62 59 41 .02 39 498 1 2 1.5 1998.5 12.4 91,000 1,800 73,000 2,300 2,310 2,900 9,000 1,000 28 1.6 73 66 41 .02 44 474 2 3 2.5 1997.7 11.5 74,000 4,800 74,000 2,300 3,270 3,300 8,000 1,000 29 1.5 73 65 37 .06 47 473 3 4 3.5 1996.8 10.3 74,000 4,800 77,000 2,100 2,320 2,900 7,000 1,000 25 3.2 67 68 45 .07 49 603 4 5 4.5 1995.7 8.8 77,000 2,600 91,000 2,800 2,800 3,100 8,000 1,100 28 2.1 66 69 33 .10 35 563 5 6 5.5 1994.5 8.2 106,000 2,100 85,000 2,400 2,400 2,100 8,000 900 16 2.2 68 69 48 .12 51 551 6 7 6.5 1993.1 5.6 116,000 1,200 93,000 2,300 2,050 1,750 7,000 900 20 2.1 95 88 38 .11 42 514 7 8 7.5 1991.5 6.7 120,000 1,300 95,000 2,700 2,220 2,400 8,000 1,000 21 2.4 93 99 36 .10 58 591 8 9 8.5 1989.9 7.7 110,000 1,400 94,000 2,400 2,430 2,800 7,000 900 21 2.5 110 90 35 .12 56 544 9 10 9.5 1988.5 7.9 114,000 1,800 93,000 2,700 2,680 2,900 7,000 900 24 2.3 101 84 34 .11 55 523 10 11 10.5 1987.0 7.4 70,500 13,800 85,500 2,100 2,220 2,900 6,500 800 26 2.6 90 75 36 .14 44 452 11 12 11.5 1985.4 7.0 68,000 12,900 85,000 2,200 2,010 2,900 7,000 800 33 2.0 76 73 52 .13 39 392 12 13 12.5 1983.6 5.8 76,000 14,000 78,000 1,800 1,820 2,600 6,000 800 31 1.9 71 68 73 .11 46 358 13 14 13.5 1981.8 7.2 65,000 15,900 76,000 1,800 1,740 2,600 6,000 800 27 2.0 74 65 100 .12 41 340 14 15 14.5 1980.0 7.0 81,000 6,400 82,000 2,100 2,000 2,500 7,000 800 25 2.8 68 69 83 .13 54 339 Table 2. Concentrations of selected major and trace elements in sediment cores—Continued. Map ID (fig. 1) Lake name Core ID Interval (centimeters) Esti- mated deposi- tion date1 Organic carbon (percent) Alu- minum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
Table 2 21

24 Berkeley 

Lake—Cont. 

BRK—Cont. 15 16 15.5 1978.2 6.6 114,000 5,500 79,000 2,600 2,020 2,300 8,000 900 30 2.1 74 72 114 0.12 48 302

16 18 17 1974.6 5.6 102,000 2,300 69,000 2,000 1,800 2,000 8,000 900 29 1.8 75 66 109 .13 44 25418 20 19 1970.0 6.6 118,000 1,900 75,000 2,300 2,000 2,600 9,000 900 28 2.0 79 72 99 .10 45 24020 22 21 1965.8 6.1 114,000 1,000 72,000 1,900 1,670 2,300 9,000 900 30 1.6 80 65 55 .12 46 22922 24 23 1960.8 4.9 134,000 1,000 73,500 2,300 1,620 2,100 10,500 1,000 25 1.3 85 62 46 .10 46 19024 26 25 1954.8 3.3 141,000 700 78,000 2,000 2,090 1,300 10,000 1,000 26 .6 84 67 43 .09 45 17826 28 27 1948.0 2.7 115,000 900 64,000 2,100 2,800 1,000 10,000 1,000 20 .4 76 51 40 .09 41 13828 30 29 Pre-res. 1.9 68,000 900 21,000 1,900 530 400 14,000 1,500 11 .2 52 14 37 .07 11 7630 32 31 Pre-res. 1.6 50,000 700 17,000 1,400 421 200 14,000 1,500 7.6 .2 48 12 33 .03 9.0 72

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0 104,000 2,000 78,500 2,250 2,070 2,550 8,000 900 26 2.0 76 68 44 .11 46 422

25 Panola Lake PAN.B 0 1 .5 1998.5 6.2 95,800 1,030 40,400 7,430 317 1,100 14,400 2,250 8.3 .2 53 20 35 .13 16 170

1 2 1.5 1996.8 6.6 108,000 1,220 37,900 9,710 356 1,050 14,500 2,060 10 .1 60 21 32 .14 14 1722 3 2.5 1994.9 6.5 77,800 1,040 29,300 8,800 289 1,100 13,800 2,000 10 .1 73 20 34 .14 28 1613 4 3.5 1993.0 6.5 86,100 1,000 29,400 7,710 260 1,100 14,100 1,880 10 .1 65 20 31 .13 22 1634 5 4.5 1990.9 6.5 78,600 1,000 27,400 7,140 232 1,000 13,600 1,880 9.3 .1 70 20 37 .13 22 1695 6 5.5 1988.8 6.5 80,700 1,000 24,200 8,290 255 1,100 14,200 1,880 10 .1 62 21 74 .14 22 1596 7 6.5 1986.5 6.4 86,600 1,330 21,600 9,430 262 1,100 14,100 1,880 9.4 .1 65 23 52 .13 19 1697 8 7.5 1984.0 6.5 78,600 1,780 18,600 8,860 249 1,400 14,200 2,000 12 .2 70 20 45 .12 30 1728 9 8.5 1981.3 6.1 53,400 1,670 17,000 6,000 199 1,200 13,300 1,750 12 .2 76 20 39 .13 22 1639 10 9.5 1978.4 6.0 48,800 1,560 13,900 7,280 184 1,200 13,300 1,880 12 .2 66 20 42 .13 25 162

10 11 10.5 1975.3 5.4 53,000 2,000 6,000 9,140 193 1,200 13,400 1,880 11 .2 63 20 39 .14 22 16011 12 11.5 1971.9 5.2 49,600 1,780 7,440 9,430 194 1,200 13,600 1,880 11 .2 100 20 48 .12 31 15612 13 12.5 1968.2 5.2 31,700 1,890 7,670 5,710 146 1,300 14,000 1,620 11 .2 81 18 36 .11 28 15313 14 13.5 1964.0 4.3 27,100 2,330 9,220 7,710 134 1,000 14,400 2,120 8.2 .1 61 14 24 .10 20 13214 15 14.5 1958.6 3.3 20,800 2,440 9,000 4,570 128 910 18,000 3,000 7.7 .1 54 13 19 .08 14 19215 16 15.5 1950.9 .9 10,900 2,780 6,110 3,140 109 510 23,400 4,000 4.4 .03 58 6.4 22 .03 15 78

16 17 16.5 Pre-res. .6 9,110 1,890 5,000 2,400 74 300 27,200 3,750 3.6 .02 26 3.6 25 .03 10 160

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.1 53,400 1,670 17,000 7,710 199 1,100 14,100 1,880 10 .1 65 20 36 .13 22 162

26 Lake 

Killarney 

KIL 0 1 .5 1999.1 25.1 63,900 17,600 9,300 3,000 103 4,100 1,700 220 3.8 1.8 64 206 295 .47 18 346

1 2 1.5 1998.7 24.0 70,100 18,400 10,100 3,200 104 4,500 1,900 220 3.4 2.0 70 233 308 .52 19 3762 3 2.5 1998.1 23.9 66,200 16,600 9,850 3,100 86 4,350 1,750 170 3.5 1.8 68 228 304 .50 18 3703 4 3.5 1997.6 24.8 54,900 14,800 9,300 2,600 75 4,400 1,400 130 5.3 1.8 67 217 302 .51 16 3484 5 4.5 1997.0 23.6 69,100 18,400 10,300 2,800 80 4,500 1,500 170 5.4 1.9 72 239 334 .52 15 391

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
22 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001 26 Lake Killarney —Cont. KIL—Cont. 5 6 5.5 1996.3 24.3 63,900 15,200 9,900 2,600 72 4,500 1,600 160 5.4 1.9 70 240 322 0.50 15 376 6 7 6.5 1995.7 23.2 66,400 16,600 9,900 2,600 73 4,000 1,500 130 5.2 1.8 68 229 297 .50 16 345 7 8 7.5 1995.0 18.5 60,000 13,000 8,500 2,600 59 3,700 1,300 170 5.5 1.3 59 203 297 .59 10 293 8 9 8.5 1994.0 18.5 61,000 12,400 8,100 2,400 59 3,400 1,500 <100 3.2 1.2 56 202 313 .49 14 271 9 10 9.5 1993.0 20.0 70,500 13,200 10,200 2,600 68 4,700 1,600 120 3.8 1.3 81 291 388 .67 17 363 10 11 10.5 1992.1 20.8 77,200 14,200 10,200 2,800 72 4,800 1,700 120 3.7 1.5 80 300 389 .68 22 350 11 12 11.5 1991.1 20.5 75,400 13,400 9,650 2,800 68 4,300 1,600 <100 3.0 1.5 76 284 387 .53 16 319 12 13 12.5 1990.0 13.8 75,000 17,600 9,100 3,000 97 5,300 1,700 120 2.3 1.2 73 272 391 .56 12 306 13 14 13.5 1988.8 20.3 62,500 10,800 8,200 2,200 59 3,900 1,400 <100 3.4 1.8 64 256 325 .51 12 273 14 15 14.5 1987.6 19.7 54,000 10,000 6,600 1,980 49 3,200 1,100 <100 3.0 1.4 51 204 328 .49 12 211 15 16 15.5 1986.3 19.4 65,800 10,800 9,300 2,000 63 4,500 1,500 <100 3.9 1.5 75 306 446 .50 14 303 16 17 16.5 1985.0 17.8 61,500 9,600 9,600 1,960 61 4,700 1,400 <100 5.7 2.0 79 333 473 .52 19 323 17 18 17.5 1983.6 18.1 79,900 12,800 10,000 2,400 72 4,900 1,800 100 6.1 2.0 87 351 479 .54 17 320 18 19 18.5 1982.3 16.5 85,500 13,400 9,500 3,000 72 4,500 1,800 <100 5.6 2.0 79 319 473 .53 14 295 19 20 19.5 1980.9 16.3 72,000 11,100 9,800 2,100 66 4,700 1,600 <100 5.3 2.3 84 343 490 .54 20 304 20 22 21 1978.9 17.7 61,600 9,000 10,000 1,500 61 5,200 1,500 <100 5.5 2.5 92 389 507 .54 18 328 22 24 23 1976.2 16.6 75,000 9,800 10,500 2,000 60 5,200 1,700 <100 4.7 2.6 94 410 528 .54 22 326 24 26 25 1973.4 17.6 107,000 10,400 11,600 3,600 72 5,800 2,100 110 6.6 2.7 103 433 558 .46 23 367 26 28 27 1970.6 17.1 97,600 9,200 10,700 1,700 56 6,100 1,600 100 6.9 2.8 104 449 551 .49 20 297 28 30 29 1967.5 15.2 117,000 11,800 11,400 3,400 64 6,400 2,200 120 5.2 2.1 108 436 563 .52 25 268 30 32 31 1964.0 13.5 130,000 11,000 12,600 2,900 62 7,500 2,900 110 6.5 2.1 126 411 535 .46 27 250 32 34 33 1959.9 11.5 115,000 10,200 10,600 3,600 61 7,400 2,600 110 5.6 2.0 115 253 376 .49 20 171 34 36 35 1954.9 10.8 110,000 8,300 10,200 2,300 52 7,850 2,600 120 6.0 1.3 101 104 192 .43 20 113 36 38 37 1949.6 16.4 69,500 6,000 8,300 1,900 68 6,500 1,300 130 4.9 .8 68 47 103 .42 15 96 38 40 39 1944.6 18.8 72,400 5,400 8,000 2,000 61 4,600 1,400 <100 4.2 .6 49 33 92 .41 9.6 79 40 42 41 1939.9 21.3 73,400 6,800 8,200 2,400 72 4,300 1,300 110 4.4 .4 48 32 81 .43 10 68 42 44 43 1935.8 23.7 70,800 7,300 7,600 3,000 73 3,700 1,300 120 3.6 .4 39 28 61 .13 16 65 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.7 70,600 11,400 9,820 2,600 68 4,550 1,600 120 5.0 1.8 74 254 355 .50 17 305 27 Lake Anne ANN.2 0 .5 .25 1996.1 4.7 62,000 2,000 67,000 2,000 666 1,400 17,000 2,500 25 -- 75 105 60 .18 42 196 .5 1 .75 1995.3 5.6 39,000 1,000 45,000 1,000 776 1,500 17,000 2,200 34 -- 72 128 74 .22 46 212 1 1.5 1.25 1994.4 4.5 56,000 2,000 52,000 1,000 648 1,300 15,000 1,800 27 -- 66 101 61 .22 38 188 1.5 2 1.75 1993.4 6.0 53,000 2,000 54,000 2,000 830 1,700 18,000 2,200 31 -- 69 143 88 .27 49 252 2 2.5 2.25 1992.5 5.3 56,000 2,000 61,000 1,000 746 1,650 17,500 1,900 25 -- 72 122 78 .28 52 262 Table 2. Concentrations of selected major and trace elements in sediment cores—Continued. Map ID (fig. 1) Lake name Core ID Interval (centimeters) Esti- mated deposi- tion date1 Organic carbon (percent) Alu- minum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
Table 2 23

27 Lake Anne

—Cont.

ANN.2

—Cont.

2.5 3 2.75 1991.5 5.9 75,000 2,000 66,000 2,000 746 1,600 20,000 2,000 24 -- 70 136 88 0.31 48 272

3 3.5 3.25 1990.5 5.1 38,000 1,000 49,000 6,000 696 1,600 18,000 2,100 23 -- 72 141 96 .33 49 2443.5 4 3.75 1989.4 4.7 74,000 2,000 72,000 5,000 756 1,600 20,000 4,000 21 -- 75 139 89 .34 63 2704 4.5 4.25 1988.2 4.0 139,000 2,000 72,000 4,000 726 1,400 23,000 2,100 19 -- 80 134 92 .31 52 2464.5 5 4.75 1987.0 3.9 116,000 2,000 70,000 5,000 738 1,300 22,000 2,000 18 -- 73 122 96 .30 48 2425 5.5 5.25 1985.7 3.9 118,000 2,000 80,000 4,000 822 1,400 12,000 2,000 17 -- 74 127 100 .29 53 2545.5 6 5.75 1984.4 4.0 129,000 2,000 83,500 4,500 798 1,400 21,000 1,900 20 -- 78 132 110 .31 52 2696 6.5 6.25 1983.2 4.0 117,000 2,000 84,000 4,000 652 1,300 17,000 1,900 19 -- 70 122 116 .30 49 2726.5 7 6.75 1982.0 4.0 126,000 2,000 83,000 5,000 714 1,300 17,000 1,800 17 -- 74 113 108 .29 47 2607 7.5 7.25 1980.7 3.4 87,000 1,000 60,000 3,000 666 1,200 20,000 1,700 15 -- 70 112 124 .28 44 2207.5 8 7.75 1979.4 3.4 132,000 2,000 81,000 5,000 672 1,400 21,000 2,400 15 -- 74 122 122 .28 52 2468 8.5 8.25 1978.0 3.4 65,000 1,000 40,000 3,000 598 1,200 19,000 1,600 20 -- 75 119 172 .26 45 2168.5 9 8.75 1976.8 3.4 128,000 2,000 82,000 5,000 614 1,400 22,000 1,700 15 -- 73 124 156 .24 49 3409 9.5 9.25 1975.5 3.3 136,000 2,000 82,000 5,000 554 1,400 23,000 1,700 14 -- 74 124 136 .22 56 2589.5 10 9.75 1974.2 3.3 81,000 1,000 49,000 3,000 578 1,200 21,000 1,800 13 -- 77 119 137 .23 48 226

10 10.5 10.25 1973.1 3.4 112,000 2,000 73,500 3,500 648 1,350 22,500 1,900 15 -- 70 131 126 .24 50 26210.5 11 10.75 1972.1 3.3 130,000 2,000 81,000 4,000 648 1,400 23,000 2,100 14 -- 73 133 136 .30 54 27811 11.5 11.24 1971.1 3.5 125,000 2,000 77,000 5,000 670 1,300 23,000 2,200 16 -- 69 155 112 .30 49 28011.5 12 11.75 1970.3 3.7 125,000 2,000 70,000 4,000 686 1,300 23,000 2,300 16 -- 73 162 120 .31 47 27012 12.5 12.25 1969.5 3.6 127,000 2,000 73,000 5,000 742 1,300 23,000 2,000 15 -- 75 125 108 .38 48 26612.5 13 12.75 1968.7 3.7 132,000 2,000 78,000 4,000 800 1,300 23,000 2,000 17 -- 78 126 104 .42 48 29413 13.5 13.25 1967.9 3.5 128,000 2,000 79,000 2,000 798 1,300 22,000 2,000 16 -- 75 125 100 .39 54 28813.5 14 13.75 1967.2 2.9 142,000 2,000 79,500 4,000 667 1,350 19,000 2,000 13 -- 76 126 94 .34 58 26114 14.5 14.25 1966.5 2.3 170,000 2,000 79,000 3,000 530 1,300 25,000 2,100 11 -- 76 110 80 .24 51 23214.5 15 14.75 1965.7 1.8 163,000 2,000 76,000 4,000 480 1,200 26,000 2,200 9.2 -- 77 100 72 .25 46 19015 15.5 15.25 1964.7 1.4 156,000 1,000 72,000 3,000 464 1,100 27,000 2,400 8.4 -- 75 99 48 .20 76 21415.5 16 15.75 1963.7 1.3 143,000 1,000 67,000 3,000 440 1,000 27,000 2,400 8.1 -- 71 82 52 .22 45 136

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6 125,000 2,000 72,500 4,000 671 1,320 21,000 2,000 16 -- 74 124 100 .28 49 256

28 Orange Reservoir NJOR.BC1 0 1 .5 1997.5 7.7 62,500 21,700 43,400 20,400 336 1,700 9,000 8,900 18 1.9 147 132 254 4.40 69 563 2 3 2.5 1996.5 7.0 56,300 21,100 44,600 13,100 334 1,800 9,300 9,000 19 1.9 158 149 265 5.13 81 614

4 5 4.5 1995.4 8.1 51,000 18,800 40,200 9,400 274 1,600 7,500 7,900 18 1.8 112 156 237 4.91 77 556

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
24 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001 28 Orange Reser- voir—Cont. NJOR.1 687 1992.3 6.6 45,500 18,600 36,800 10,800 258 1,300 8,000 8,400 19 1.9 109 214 410 3.64 70 507 8 10 9 1990.0 6.0 46,200 18,600 36,400 10,500 280 1,200 7,900 8,700 22 1.8 120 211 440 3.47 67 462 10 12 11 1986.9 5.2 50,500 18,600 38,200 10,900 304 1,200 8,200 8,900 21 1.4 111 238 508 2.49 67 456 12 14 13 1983.2 5.2 33,600 15,800 33,600 7,900 276 1,300 7,800 8,900 17 1.9 104 213 514 2.21 62 442 14 16 15 1979.2 4.6 38,400 15,800 35,100 8,200 288 1,300 7,900 9,200 12 1.6 127 192 560 2.11 65 420 16 18 17 1975.3 4.0 38,800 15,900 38,400 8,900 292 1,300 7,600 9,200 13 1.5 113 170 492 1.99 63 384 18 20 19 1971.8 3.8 37,900 15,200 42,000 8,500 304 1,400 8,200 9,300 16 1.5 119 192 468 1.81 70 391 20 22 21 1968.7 3.5 34,200 13,800 40,200 8,500 314 1,300 7,900 8,700 14 1.5 122 227 432 1.50 71 391 22 24 23 1966.1 3.4 36,300 13,400 39,500 7,450 331 1,200 7,500 8,350 16 1.5 122 378 338 1.53 78 372 24 26 25 1963.6 2.9 37,100 13,800 39,300 7,900 378 1,300 7,600 9,100 16 1.6 127 419 370 1.57 76 398 26 28 27 1960.7 2.7 34,200 11,100 38,000 7,300 288 1,400 7,300 8,800 14 1.4 109 303 224 1.31 65 298 28 30 29 1957.4 2.5 35,600 11,100 36,800 6,700 370 1,400 7,100 8,400 14 1.3 97 258 202 1.29 67 289 30 32 31 1953.4 3.8 56,100 12,400 44,800 10,900 372 1,300 8,900 8,400 20 1.4 99 195 206 1.30 66 300 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3 38,600 15,800 38,800 8,700 304 1,300 7,900 8,850 16 1.6 116 212 390 2.05 68 409 29 Newbridge Pond NEW.3 0 1 .5 1997.7 17.2 56,000 9,600 28,200 4,800 654 1,700 7,500 4,700 20 1.6 89 170 1,010 .82 60 1,080 2 3 2.5 1996.5 17.2 58,400 9,650 27,500 5,100 624 1,650 7,600 4,600 19 1.6 98 170 1,020 .77 60 1,100 4 5 4.5 1995.3 17.5 65,200 10,000 27,200 6,000 628 1,700 7,600 4,600 20 1.4 95 172 1,020 .79 62 1,180 6 7 6.5 1994.0 17.4 66,800 9,900 29,100 5,100 699 1,600 7,600 4,500 14 1.2 102 172 1,030 .73 60 1,060 8 9 8.5 1992.7 17.3 62,600 9,800 28,900 4,900 659 1,700 7,900 4,600 13 1.3 105 173 1,050 .78 62 1,090 10 11 10.5 1991.3 17.5 62,200 9,400 28,300 4,800 734 1,700 7,300 4,400 12 1.3 94 174 1,020 .72 61 1,090 12 13 12.5 1990.0 17.5 57,100 8,900 28,200 4,400 691 1,600 7,500 4,400 13 1.3 106 176 1,160 .86 62 1,110 14 15 14.5 1988.4 16.7 62,000 9,200 26,800 4,800 664 1,600 7,300 4,400 12 1.6 91 173 1,270 .93 67 1,110 16 17 16.5 1986.8 16.9 60,300 9,300 26,700 4,800 704 1,700 7,100 4,300 13 1.9 101 174 1,370 .98 65 1,080 18 19 18.5 1985.3 16.4 62,800 9,400 28,400 4,000 788 1,700 8,600 4,400 13 1.7 97 171 1,530 .84 65 1,020 19 20 19.5 1984.6 16.6 53,600 8,600 26,800 4,400 605 1,600 7,900 4,300 12 1.7 91 172 1,580 .83 62 1,100 20 21 20.5 1983.8 16.5 56,000 8,100 28,600 3,500 732 1,600 10,100 4,200 12 1.7 101 167 1,760 .84 63 1,090 21 22 21.5 1983.1 16.3 62,000 9,200 28,200 4,150 702 1,600 9,600 4,250 10 1.5 91 168 1,900 .92 62 1,070 22 23 22.5 1982.3 15.9 58,000 8,600 28,200 4,800 692 1,600 9,400 4,200 10 2.0 94 160 1,990 .95 60 1,040 23 24 23.5 1981.5 15.4 66,000 10,000 28,600 2,900 772 1,700 9,600 4,500 12 2.0 109 167 2,090 .94 60 1,020 24 25 24.5 1980.7 15.7 74,000 9,400 29,800 3,800 706 1,700 10,600 4,400 13 1.8 102 164 2,130 .98 59 1,030 25 26 25.5 1979.8 15.3 67,600 9,800 28,400 3,100 666 1,700 9,800 4,500 12 1.9 104 163 2,100 .99 61 1,040 26 27 26.5 1979.0 15.1 67,200 9,000 30,000 3,700 668 1,700 10,600 4,500 13 1.9 106 167 2,270 1.02 68 1,050 27 28 27.5 1978.1 14.8 51,600 7,600 29,800 2,800 685 1,600 10,100 4,300 13 1.2 100 157 2,190 1.00 58 984

28 29 28.5 1977.2 14.8 68,800 9,000 29,800 3,600 693 1,700 9,800 4,300 12 1.3 101 156 2,190 .98 58 968

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
Table 2 25

29 Newbridge 

Pond—Cont.

NEW.3

—Cont.

29 30 29.5 1976.3 14.4 58,800 8,000 31,000 3,700 708 1,700 10,100 4,500 14 1.4 100 159 2,340 1.04 58 960

30 31 30.5 1975.4 14.4 64,800 9,400 28,800 2,900 638 1,700 8,900 4,700 14 1.7 96 157 2,240 1.02 58 96332 33 32.5 1973.5 13.9 57,900 9,400 28,800 2,500 670 1,700 7,600 4,300 13 1.9 105 155 2,250 1.14 57 89734 35 34.5 1971.6 14.2 67,800 9,600 29,100 3,100 651 1,800 8,100 4,200 12 1.4 96 153 2,250 1.10 58 94936 37 36.5 1969.7 13.7 63,200 7,500 28,600 2,500 668 1,900 5,600 4,100 10 1.9 107 160 2,170 1.08 60 83938 39 38.5 1967.9 14.0 51,600 7,800 31,000 2,400 698 1,900 6,100 3,900 8.8 1.5 113 165 2,210 1.21 61 89440 41 40.5 1966.1 13.9 60,400 7,500 31,600 3,200 744 1,900 6,200 3,700 8.0 1.3 125 161 2,000 1.20 65 88842 43 42.5 1964.5 12.7 64,000 6,200 31,400 3,350 681 1,750 7,100 3,650 9.0 1.0 94 144 1,430 .89 60 76044 45 44.5 1962.7 12.6 34,400 2,700 37,400 1,800 666 1,800 8,400 3,300 10 .7 80 103 893 .72 46 53646 47 46.5 1960.8 10.6 38,800 4,000 32,800 1,600 626 1,600 5,600 2,900 10 .5 65 88 614 .78 42 46448 49 48.5 1958.7 11.3 52,400 3,800 35,600 1,900 718 2,200 5,400 2,100 7.2 .4 72 97 317 .48 43 36249 50 49.5 Pre-res. 5.5 16,600 1,200 7,100 800 198 410 2,900 1,000 3.6 <.2 1.7 18 23 .34 6.7 52

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.4 62,000 9,200 28,800 3,700 685 1,700 7,900 4,300 12 1.5 100 165 1,760 .93 60 1,030

30 Big Round 

Top Pond 

BRT.B1 0 .5 .25 2000.0 17.4 57,700 6,700 20,000 4,200 281 920 8,400 5,600 11 .1 40 12 80 .19 16 82

.5 1 .75 1997.0 18.3 58,300 6,500 19,200 4,200 284 960 8,800 5,700 11 .1 38 13 68 .19 12 88

1 1.5 1.25 1995.0 17.4 57,700 6,600 18,900 4,400 290 990 8,800 5,500 10 .2 36 12 70 .19 16 831.5 2 1.75 1993.0 16.8 56,600 6,450 17,000 4,200 278 855 8,700 5,800 11 .1 36 12 70 .18 20 882 2.5 2.25 1992.0 16.5 50,000 6,000 15,400 4,000 298 800 8,400 6,900 10 .2 31 11 77 .15 18 722.5 3 2.75 1990.0 15.9 55,800 7,100 16,500 3,700 292 850 9,100 7,300 10 .2 45 10 76 .16 13 733 3.5 3.25 1988.0 15.4 61,200 8,100 17,500 4,000 313 950 9,900 7,700 10 .2 50 12 75 .19 19 1063.5 4 3.75 1986.0 15.5 59,000 7,300 17,400 4,300 302 950 9,400 7,300 10 .1 47 12 78 .19 14 824 4.5 4.25 1984.0 14.8 65,300 7,600 17,200 4,900 307 750 10,100 7,700 10 .2 44 12 76 .17 13 1004.5 5 4.75 1982.0 16.1 64,800 7,300 16,700 5,100 300 950 9,700 7,600 12 .2 43 12 70 .17 13 815 5.5 5.25 1980.0 14.1 62,700 7,100 15,800 4,900 285 950 9,900 7,700 11 .1 42 12 66 .17 18 795.5 6 5.75 1978.0 13.2 63,700 7,300 16,100 4,900 295 800 10,100 7,900 11 .1 42 12 67 .16 13 896 6.5 6.25 1976.0 13.6 64,000 7,050 15,700 5,000 290 925 10,000 7,800 10 .1 38 11 67 .18 14 886.5 7 6.75 1974.0 13.5 64,300 7,100 16,400 4,900 294 900 10,100 7,600 10 .2 43 12 64 .18 11 967 7.5 7.25 1972.0 13.9 63,200 7,100 16,200 4,900 291 850 9,700 7,700 10 .1 46 11 63 .19 15 1007.5 8 7.75 1970.0 13.8 63,300 6,900 16,200 4,900 307 900 10,000 7,400 12 .1 45 11 64 .17 15 968 8.5 8.25 1969.0 14.2 52,200 5,700 14,200 3,700 248 700 8,400 6,400 12 .1 43 11 74 .18 15 938.5 9 8.75 1967.0 14.2 60,300 6,400 15,600 4,300 286 800 9,100 7,000 12 .1 45 12 73 .17 14 879 9.5 9.25 1965.0 14.0 54,300 6,000 14,700 4,000 264 850 8,400 6,300 11 .1 48 12 64 .16 12 869.5 10 9.75 1964.0 14.5 60,500 6,800 15,400 4,600 294 800 8,900 2,600 11 .1 48 12 63 .15 14 87

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
26 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001 30 Big Round Top Pond —Cont. BRT.B1 —Cont. 10 10.5 10.25 1963.0 13.7 59,300 6,800 15,200 4,300 304 900 9,400 7,000 10 0.2 47 10 60 0.16 11 91 10.5 11 10.75 1961.0 14.5 54,000 6,150 14,400 3,700 283 920 8,850 6,650 9.2 .2 48 11 64 .15 14 85 11 11.5 11.25 1960.0 14.4 58,700 6,800 15,100 4,000 305 800 8,900 7,100 8.3 .2 51 11 73 .17 11 89 11.5 12 11.75 1958.0 14.0 53,500 6,700 14,200 4,000 286 650 8,000 6,100 8.5 .2 51 12 65 .16 15 99 12 12.5 12.25 1957.0 15.1 54,000 6,500 14,400 3,700 296 700 8,600 6,900 9.3 .2 49 11 65 .16 14 82 12.5 13 12.75 1956.0 15.1 52,800 6,800 14,200 4,000 300 600 8,300 6,400 9.4 .2 55 9.8 63 .17 11 81 13 13.5 13.25 1954.0 14.9 56,300 6,800 14,500 4,000 304 650 11,000 7,300 8.5 .2 50 9.3 62 .16 14 84 13.5 14 13.75 1953.0 14.1 54,500 7,300 14,600 4,000 311 750 9,100 7,000 8.5 .2 48 11 66 .16 11 94 14 14.5 14.25 1952.0 14.8 54,000 7,200 15,100 3,700 320 750 9,300 7,600 8.7 .1 51 11 58 .15 12 88 14.5 15 14.75 1950.0 14.7 56,700 7,350 14,400 3,700 320 675 10,700 8,300 8.0 .2 54 10 57 .12 12 86 15 15.5 15.25 1949.0 15.6 60,300 7,500 13,800 3,400 315 650 14,000 9,700 7.0 .2 54 8.9 52 .11 15 83 15.5 16 15.75 1948.0 12.8 48,800 6,500 12,200 3,100 293 550 9,900 7,600 7.5 .2 59 8.4 44 .10 17 69 16 16.5 16.25 1947.0 14.0 55,800 6,100 11,600 3,100 282 600 17,000 10,300 6.0 .1 43 8.1 41 .12 10 71 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.4 57,700 6,800 15,400 4,000 294 800 9,300 7,300 10 .2 46 11 66 .17 14 87 31 Harris Pond HSP.B2 0 1 .5 2000.4 10.8 84,000 17,000 36,000 9,300 952 2,300 12,000 14,000 6.0 .8 35 60 55 .14 23 213 1 2 1.5 1999.6 10.4 83,000 15,000 34,000 11,000 816 2,000 13,000 15,000 5.1 .9 42 58 57 .20 20 216 2 3 2.5 1998.5 10.4 71,000 12,000 32,000 9,000 708 2,000 12,000 14,000 5.4 .5 39 54 58 .21 26 199 3 4 3.5 1997.4 10.4 83,000 15,000 32,000 11,000 776 2,000 12,000 14,000 4.0 .6 37 55 59 .22 15 211 4 5 4.5 1996.2 10.4 80,500 14,000 32,000 10,400 725 1,950 12,500 14,500 4.4 .5 40 54 55 .20 12 201 5 6 5.5 1995.1 10.0 77,000 15,000 33,000 8,700 715 2,200 13,000 15,000 7.9 .4 42 60 57 .20 10 212 6 7 6.5 1993.9 9.8 80,000 15,000 33,000 10,300 700 2,300 13,000 15,000 8.8 .4 44 60 53 .21 12 209 7 8 7.5 1992.7 9.7 83,000 15,000 33,000 10,300 692 2,100 13,000 15,000 8.5 .6 43 60 54 .23 14 205 8 9 8.5 1991.4 9.3 80,500 13,000 32,000 9,750 689 2,000 13,500 14,500 8.7 .2 50 62 58 .21 21 208 9 10 9.5 1990.0 9.1 95,000 14,000 32,000 9,300 695 1,900 13,000 14,000 9.2 .2 52 61 70 .22 21 204 11 12 11.5 1986.8 8.2 85,000 14,000 32,000 10,700 655 2,000 13,000 15,000 6.8 .3 47 63 62 .25 20 211 13 14 13.5 1983.6 8.1 88,000 15,000 32,000 10,000 668 2,000 14,000 16,000 7.0 .3 54 64 62 .21 24 200 15 16 15.5 1979.6 8.8 89,000 14,000 31,000 9,300 639 2,100 14,000 15,000 4.4 .1 50 72 60 .21 25 195 17 18 17.5 1975.8 9.2 87,000 14,000 31,000 9,000 619 2,100 13,000 14,000 4.9 .2 51 87 62 .24 21 200 19 20 19.5 1972.1 9.1 85,000 13,000 29,000 8,300 615 2,200 12,000 14,000 4.3 .2 58 102 85 .23 25 215 21 22 21.5 1968.2 8.8 85,000 15,000 28,000 9,300 595 2,200 12,000 15,000 3.3 .3 53 101 87 .25 21 207 23 24 23.5 1964.0 8.5 70,000 12,000 26,000 8,000 504 2,100 12,000 15,000 4.2 .3 53 94 83 .23 25 200 25 26 25.5 1958.8 8.3 81,000 12,000 24,000 7,000 493 1,800 13,000 16,000 3.9 .3 45 96 81 .23 22 197 27 28 27.5 1953.4 4.8 57,000 10,000 14,000 5,300 332 900 15,000 16,000 2.9 .2 26 48 36 .11 18 101

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.2 83,000 14,000 32,000 9,300 689 2,000 13,000 15,000 5.1 .3 45 61 59 .21 21 205

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
Table 2 27

32 Upper Mystic 

Lake 

MYS.B2 0 1 0.5 2000.2 -- 74,500 14,000 49,800 11,300 852 2,200 15,800 10,400 80 8.2 379 390 563 1.76 48 1,930

1 2 1.5 1998.9 -- 75,700 13,800 49,200 11,300 890 2,200 15,700 10,500 95 8.2 391 408 690 1.62 51 2,0302 3 2.5 1997.5 -- 77,800 13,800 49,200 11,600 900 2,200 16,000 10,500 97 8.1 386 405 666 1.73 46 2,0103 4 3.5 1996.2 -- 75,800 13,900 47,800 11,300 919 2,300 15,800 10,300 102 7.9 374 401 620 1.82 50 1,9604 5 4.5 1994.8 -- 74,800 13,700 48,400 11,600 956 2,400 15,300 10,500 106 8.1 382 413 635 1.73 51 2,0005 6 5.5 1993.4 -- 77,800 13,900 50,400 12,900 969 2,300 17,500 10,500 107 8.2 395 419 629 1.79 43 2,0506 7 6.5 1992.0 -- 77,300 13,900 49,700 12,400 989 2,600 16,700 10,600 108 8.2 382 411 676 1.78 48 1,9907 8 7.5 1990.5 -- 70,500 14,800 50,200 9,600 1,000 2,400 12,500 10,200 113 7.1 414 404 637 1.81 39 2,1508 9 8.5 1989.1 -- 68,700 13,900 49,600 9,000 1,010 2,500 11,000 9,780 122 8.3 411 402 623 1.72 45 2,1809 10 9.5 1987.8 -- 69,200 14,100 49,000 9,000 1,010 2,600 11,500 9,670 125 7.9 464 404 653 1.80 66 2,190

10 11 10.5 1986.4 -- 71,800 14,000 48,700 9,200 971 2,200 11,400 9,780 121 7.8 426 407 688 1.68 48 2,23011 12 11.5 1985.1 -- 73,300 13,800 50,300 9,800 951 2,400 12,000 9,890 128 7.9 459 424 726 1.78 54 2,30012 13 12.5 1983.7 -- 76,500 13,600 50,400 9,900 856 2,250 12,400 9,890 143 8.3 500 442 849 1.72 52 2,42013 14 13.5 1982.3 -- 79,500 13,500 51,600 10,200 804 2,200 13,100 9,780 148 8.3 544 440 971 1.76 53 2,49014 15 14.5 1980.8 -- 77,200 13,500 49,200 10,200 765 2,100 12,100 9,780 125 8.2 543 433 1,000 1.81 53 2,50015 16 15.5 1979.2 -- 74,300 14,000 48,000 9,600 730 2,200 11,500 9,670 127 8.2 564 445 990 1.72 53 2,57016 17 16.5 1977.7 -- 71,300 12,100 47,700 12,300 749 2,100 12,200 9,780 116 8.5 530 461 1,110 1.73 52 2,66017 18 17.5 1976.2 -- 75,300 13,900 47,400 12,000 749 2,300 11,000 10,000 125 9.4 564 469 1,170 1.79 53 2,70018 19 18.5 1974.7 -- 77,600 13,800 49,100 13,000 713 2,400 11,600 10,000 128 9.8 603 483 1,260 1.90 53 2,75019 20 19.5 1973.0 -- 75,600 13,400 48,300 11,700 692 2,400 11,500 9,780 130 9.5 660 496 1,460 1.76 56 2,89020 22 21 1970.6 -- 76,200 13,900 49,600 11,000 668 2,300 11,400 10,000 124 10.8 746 526 1,450 1.72 58 2,94022 24 23 1967.6 -- 73,800 13,400 51,300 11,000 637 2,500 10,000 9,560 130 13.2 958 554 1,540 1.94 51 3,12024 26 25 1964.6 -- 82,500 13,400 53,600 11,700 623 2,500 12,200 9,670 149 12.4 1,270 509 1,350 1.92 54 3,28026 28 27 1961.3 -- 84,700 13,000 48,900 12,300 605 2,200 13,600 10,400 138 8.8 1,200 427 1,090 1.92 58 3,18028 30 29 1957.6 -- 84,400 13,700 45,100 12,700 603 2,150 12,000 10,300 119 9.0 951 394 992 2.14 46 3,18030 32 31 1953.9 -- 83,800 14,200 44,100 13,200 593 2,200 11,400 10,400 117 9.4 552 437 792 2.48 52 3,37032 34 33 1950.5 -- 82,200 13,800 41,600 13,200 564 2,000 10,100 9,880 115 12.8 468 511 718 2.55 44 3,67034 36 35 1947.0 -- 84,900 13,400 40,100 12,000 523 1,600 10,000 9,290 130 13.7 429 727 556 2.63 35 5,27036 38 37 1942.9 -- 81,100 11,600 29,600 12,000 451 1,200 10,000 8,470 127 11.5 281 642 296 2.47 26 5,33038 40 39 1938.0 -- 80,200 11,400 28,400 15,200 651 1,000 13,000 10,200 97 10.3 118 500 164 .51 29 7,09040 41 40.5 1934.1 -- 71,800 12,000 20,700 12,800 507 740 12,700 11,500 31 6.1 148 202 50 .40 36 3,210

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -- 76,200 13,800 49,000 11,600 749 2,200 12,100 10,000 122 8.3 464 433 718 1.8 51 2,570

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
28 Major and Trace Elements in 35 Lake and Reservoir Sediment Cores From Across the United States, 1994–2001 33 South Reser- voir SRV 0 0.5 0.25 1999.5 17.4 63,400 10,200 48,700 10,000 768 1,700 6,820 5,880 20 1.7 45 231 270 0.71 33 251 .5 1 .75 1996.8 17.5 69,400 11,300 54,200 11,500 799 1,700 8,120 6,590 17 1.7 48 257 389 .70 44 270 1 1.5 1.25 1993.7 16.7 73,800 11,300 54,800 14,500 791 2,000 8,710 6,820 16 1.7 48 267 349 .69 46 280 1.5 2 1.75 1990.3 16.4 73,300 11,700 55,100 15,000 765 1,950 9,120 7,120 17 1.8 50 277 340 .65 44 305 2 2.5 2.25 1987.2 16.5 73,300 11,800 51,500 12,500 794 1,900 9,100 7,100 18 1.8 55 280 345 .66 34 301 2.5 3 2.75 1983.8 16.3 74,200 11,600 52,900 14,000 719 2,000 9,650 7,180 19 1.8 51 272 346 .63 44 293 3 3.5 3.25 1980.2 16.2 74,200 12,000 52,600 13,000 704 2,000 9,060 7,180 21 1.8 52 293 370 .64 43 297 3.5 4 3.75 1976.6 17.1 77,600 12,200 53,600 16,500 718 2,000 9,530 7,060 17 1.8 50 308 363 .67 42 298 4 4.5 4.25 1973.0 17.4 76,500 13,300 52,600 14,000 740 2,000 9,180 7,060 16 2.5 50 324 360 .67 49 309 4.5 5 4.75 1969.6 18.1 70,200 13,300 50,500 10,000 728 1,900 8,120 6,940 19 2.6 53 319 320 .67 44 308 5 5.5 5.25 1966.1 18.2 69,500 12,400 49,100 12,500 673 2,000 8,400 6,900 23 1.8 51 316 332 -- 45 305 5.5 6 5.75 1962.6 18.1 75,300 13,100 47,600 13,200 682 2,050 9,820 7,470 18 2.1 52 290 337 .62 36 317 6 6.5 6.25 1959.3 17.5 71,400 13,300 44,600 10,500 664 2,000 8,710 7,060 18 1.7 49 263 333 .58 37 298 6.5 7 6.75 1956.0 18.3 72,200 13,800 44,200 11,500 632 2,100 9,180 7,290 23 1.7 53 270 322 -- 33 289 7 7.5 7.25 1952.6 19.1 72,400 14,700 42,200 18,500 629 2,000 9,290 7,100 23 1.6 54 266 321 .55 34 273 7.5 8 7.75 1949.3 20.4 62,000 10,500 36,000 11,000 547 1,700 7,880 5,760 18 1.0 49 224 257 -- 25 226 8 8.5 8.25 1946.1 23.7 66,400 14,500 34,500 15,000 641 1,400 7,650 5,650 22 1.5 48 210 235 .47 27 232 8.5 9 8.75 1942.9 23.4 65,100 14,200 37,200 13,000 674 1,500 7,880 6,120 17 1.3 47 228 250 -- 29 228 9 9.5 9.25 1939.8 28.6 54,000 15,100 31,300 12,000 675 1,300 6,240 4,820 16 .9 39 170 203 .38 30 182 9.5 10 9.75 1936.9 29.3 54,000 15,100 31,400 12,000 681 1,300 6,290 4,710 18 .9 32 178 196 -- 26 191 10 10.5 10.25 1934.0 30.8 45,100 15,600 28,000 10,500 676 1,100 5,290 4,120 16 .7 33 139 135 .36 27 152 10.5 11 10.75 1931.2 34.5 42,700 17,600 28,200 10,000 745 970 4,940 3,880 12 .7 29 120 138 -- 28 159 . . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.1 70,800 13,200 48,100 12,500 693 1,920 8,550 6,920 18 1.7 49 266 327 .65 35 285 34 Charles River CHA.B1 0 1 .5 2000.1 10.9 51,000 9,000 46,000 14,800 679 1,700 12,000 27,000 7.6 2.7 100 200 501 1.38 53 587 1 2 1.5 1998.9 11.7 54,000 10,000 53,000 12,800 725 2,100 14,000 29,400 8.2 3.0 121 235 588 1.51 64 654 2 3 2.5 1997.8 11.5 51,000 10,000 53,000 11,600 750 2,200 14,000 29,000 8.9 3.7 130 223 544 1.44 65 618 3 4 3.5 1996.7 11.8 55,000 14,000 53,000 13,400 809 2,700 15,000 32,700 8.2 3.7 117 223 533 1.42 52 627 4 5 4.5 1995.5 10.1 52,000 9,000 44,000 13,200 644 1,900 13,000 25,100 7.7 3.5 111 209 477 1.28 59 592 5 6 5.5 1994.3 10.7 52,000 11,000 42,500 14,000 641 1,850 13,000 28,600 8.9 3.8 112 225 518 1.31 52 616 6 7 6.5 1993.1 12.2 51,000 12,000 44,000 14,000 618 2,000 14,000 30,700 6.3 3.6 114 241 563 1.40 57 700 7 8 7.5 1992.0 11.8 55,000 13,000 45,000 10,600 646 2,100 14,000 32,300 5.8 3.5 110 232 581 1.35 46 714 8 9 8.5 1990.8 12.5 58,000 13,000 41,000 10,400 546 1,800 12,000 30,400 6.9 3.8 107 227 508 1.44 52 621 9 10 9.5 1989.7 12.3 54,000 11,000 48,000 12,800 551 2,200 14,000 29,600 7.1 4.0 121 274 631 2.18 72 733 Table 2. Concentrations of selected major and trace elements in sediment cores—Continued. Map ID (fig. 1) Lake name Core ID Interval (centimeters) Esti- mated deposi- tion date1 Organic carbon (percent) Alu- minum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle

Footnote at end of table.
Table 2 29

1 From Van Metre and others, (2004).

34 Charles River

—Cont. 

CHA.B1—

Cont.

10 11 10.5 1988.5 12.7 54,000 11,000 47,000 10,800 519 2,000 14,000 28,600 6.6 4.3 108 274 644 2.32 70 762

12 13 12.5 1986.2 12.6 52,000 11,000 47,000 10,400 545 1,800 14,000 27,300 7.5 4.3 129 310 737 2.34 57 82214 15 14.5 1983.9 12.7 54,000 11,000 45,000 11,200 483 2,100 14,000 25,600 7.4 4.5 115 284 667 2.60 48 79216 17 16.5 1981.6 12.2 52,000 10,000 42,000 10,800 436 1,700 13,000 25,400 4.4 3.9 107 272 598 2.24 54 71818 19 18.5 1979.2 9.8 49,000 9,000 39,000 10,000 394 1,600 10,000 23,700 2.8 3.8 101 228 565 2.15 48 62120 22 21 1976.2 12.4 51,000 10,000 48,000 11,200 650 1,900 12,000 25,900 3.0 4.7 124 302 749 2.18 67 79324 26 25 1971.5 12.3 53,000 12,000 45,500 13,100 744 2,250 13,500 28,600 3.5 4.3 120 306 820 2.21 55 81828 30 29 1966.5 10.3 50,000 10,000 42,000 13,600 580 1,800 12,000 22,700 3.3 4.6 110 312 788 2.29 57 71932 34 33 1961.5 11.7 50,000 11,000 44,000 14,400 809 2,700 13,000 24,700 2.1 4.8 154 317 825 2.26 56 79536 38 37 1956.3 9.8 56,000 11,000 34,000 13,400 646 2,400 12,000 23,100 2.4 4.1 140 300 724 2.10 51 71340 42 41 1951.2 8.9 52,000 11,000 35,000 14,400 629 2,500 12,000 23,300 3.4 3.7 119 277 700 1.99 47 641

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.8 52,000 11,000 45,000 12,800 641 2,000 13,000 27,300 6.6 3.8 115 272 598 2.10 55 713

35 Crocker Pond CRK.B1 0 .5 .25 1999.4 23.0 42,200 7,830 19,100 4,290 292 1,400 4,470 3,120 <1.0 1.0 18 15 49 .07 14 102

.5 1 .75 1996.5 23.5 42,400 7,670 17,200 4,570 259 1,600 4,240 3,250 <1.0 1.2 12 16 44 <.02 13 100

1 1.5 1.25 1993.4 23.7 42,000 7,170 15,100 4,290 221 1,500 4,350 3,120 <1.0 .8 18 16 50 .15 12 1081.5 2 1.75 1989.9 23.3 40,700 7,000 14,100 4,290 209 1,500 4,470 3,120 <1.0 1.1 15 16 41 <.02 11 1002 2.5 2.25 1986.2 22.8 44,200 7,500 14,400 4,570 216 1,600 4,410 3,250 <1.0 1.2 13 16 24 .19 9.2 1112.5 3 2.75 1982.2 22.6 44,900 7,330 13,700 4,570 206 1,500 4,470 3,380 <1.0 .4 15 17 47 .18 15 1123 3.5 3.25 1977.8 22.3 43,800 7,170 13,400 4,570 201 1,500 4,470 3,250 <1.0 .5 14 18 34 .02 13 1123.5 4 3.75 1973.1 22.1 45,400 7,000 13,300 4,570 201 1,400 4,350 3,380 <1.0 1.3 27 19 42 .09 11 1094 4.5 4.25 1967.6 21.7 46,400 7,500 13,700 4,570 202 1,300 4,470 3,380 <1.0 1.4 23 20 31 .08 25 1154.5 5 4.75 1961.0 22.0 46,400 7,170 13,400 4,570 196 1,400 4,470 3,380 <1.0 1.4 16 18 33 .10 18 1175 6 5.5 1951.5 22.6 49,400 7,500 13,700 4,860 225 1,400 4,590 3,750 <1.0 1.9 15 20 27 .11 12 1306 7 6.5 1939.2 23.1 48,400 7,670 13,000 4,710 198 1,200 4,820 4,060 <1.0 1.5 17 20 37 .14 12 1287 8 7.5 1925.5 22.6 52,000 8,170 14,200 4,860 216 1,000 5,180 4,620 <1.0 .2 17 20 36 .09 12 1378 9 8.5 1905.2 21.9 50,000 8,170 14,100 4,570 210 920 5,180 4,620 <1.0 .2 16 18 31 <.02 8.3 1119 10 9.5 1875.4 22.7 46,900 7,830 11,900 4,290 204 970 4,710 4,250 <1.0 .5 13 18 55 .05 12 98

10 11 10.5 1829.1 21.8 44,200 7,500 10,000 4,000 179 1,100 4,120 3,620 <1.0 .1 24 16 36 <.02 8.9 73

. . . . . . . . . . . . . . . . . . . . Median . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.6 45,200 7,500 13,700 4,570 208 1,400 4,470 3,380 <1.0 1.1 16 18 36 .08 12 111

Table 2. Concentrations of selected major and trace elements in sediment cores—Continued.

Map

ID

(fig. 1)

Lake name Core ID

Interval

(centimeters)

Estimated

deposition date1

Organic

carbon

(percent)

Aluminum Cal- cium Iron Magne- sium Manga- nese Phos- phorus Potas- sium Sodi- um Arse- nic Cad- mium Chro- mium Cop- per Lead Mer- cury Nickel Zinc Top Bot- tom Mid- dle
Prepared by the USGS Texas Water Science Center:

8027 Exchange Drive

Austin, TX 78754–4733

Information regarding water resources in Texas is available at 

http: //tx.usgs.gov/