In cooperation with the U.S. Air Force 

Degree of Contamination and Sources of

Polychlorinated Biphenyls in Meandering

Road Creek and Woods Inlet of Lake Worth,

Fort Worth, Texas, 2004 and 2006–07

Scientific Investigations Report 2008–5177

U.S. Department of the Interior

U.S. Geological Survey
Blank Page
Degree of Contamination and Sources of 

Polychlorinated Biphenyls in Meandering 

Road Creek and Woods Inlet of Lake Worth, 

Fort Worth, Texas, 2004 and 2006–07

By Christopher L. Braun, Jennifer T. Wilson, and Peter C. Van Metre

In cooperation with the U.S. Air Force

Scientific Investigations Report 2008–5177

U.S. Department of the Interior

U.S. Geological Survey
U.S. Department of the Interior

DIRK KEMPTHORNE, Secretary

U.S. Geological Survey

Mark D. Myers, Director

U.S. Geological Survey, Reston, Virginia: 2008

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Suggested citation:

Braun, C.L., Wilson, J.T., and Van Metre, P.C., 2008, Degree of contamination and sources of polychlorinated biphenyls 

in Meandering Road Creek and Woods Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07: U.S. Geological 

Survey Scientific Investigations Report 2008–5177, 64 p. 
iii

Contents

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

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

Purpose and Scope .............................................................................................................................3

Polychlorinated Biphenyls .................................................................................................................3

Site Background and Description of Study Area ...........................................................................3

Acknowledgment .................................................................................................................................7

Approach ........................................................................................................................................................7

Collection and Processing of Suspended Sediment Samples .....................................................7

Collection and Processing of Streambed Sediment Samples ......................................................8

Collection and Processing of Lake-Bottom Sediment Samples ..................................................8

Analytical Methods ..............................................................................................................................9

Quality Control ......................................................................................................................................9

Age-Dating Lake-Bottom Sediment Samples .................................................................................9

Degree of Contamination and Sources of Polychlorinated Biphenyls ..............................................10

Summary .......................................................................................................................................................24

References ...................................................................................................................................................24

Appendixes 

1. List of sampling sites, locations, dates, types of samples collected, and types of 

analyses in and near Meandering Road Creek and Woods Inlet of Lake Worth, 

Fort Worth, Texas, 2004 and 2006–07 ......................................................................................29

2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and 

organochlorine pesticide concentrations in suspended, streambed, and lakebottom sediment samples from sites in and near Meandering Road Creek and 

Woods Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07 ....................................31

3. Quality control laboratory blank and spike sample results for polychlorinated 

biphenyl (PCB) Aroclor and organochlorine pesticide analyses for samples from 

sites in and near Meandering Road Creek and Woods Inlet of Lake Worth, Fort 

Worth, Texas, 2004 and 2006–07 ..............................................................................................49

4. Volatile organic compound concentrations in water samples from sites on or 

near Meandering Road Creek, Lake Worth, Fort Worth, Texas, 2004 ...............................52

5. Major and trace element concentrations in lake-bottom sediment samples from 

sites in Woods Inlet of Lake Worth, Fort Worth, Texas, 2006 .............................................59

Figures

1. Map showing location of Meandering Road Creek, Woods Inlet of Lake Worth, 

and Air Force Plant 4, Fort Worth, Texas .................................................................................2

2. Map showing sampling sites on and near Meandering Road Creek and in Woods 

Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07 ....................................................4

3. Graphs showing polychlorinated biphenyl (PCB) congener compositions of three 

widely used PCB Aroclors ..........................................................................................................5

4. Map showing suspended and streambed sediment sampling sites, 2004 and 

2006–07, and areas of known polychlorinated biphenyl release near Woods Inlet 

of Lake Worth, Fort Worth, Texas ..............................................................................................6
iv

5. Graphs showing ratios of total polychlorinated biphenyl (PCB) concentrations 

(as sum of three Aroclors [ΣPCBA] and as sum of 27 reported congeners [ΣPCBC]) 

to threshold effect concentration (TEC), a consensus-based sediment quality 

guideline (MacDonald and others, 2000) for suspended, streambed, and lakebottom sediment samples collected from Meandering Road Creek and Woods 

Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07 ..................................................12

6. Graphs showing total polychlorinated biphenyl (PCB) concentrations in suspended 

and streambed sediment samples from Besse and others (2005) and this report 

collected at sites on and near Meandering Road Creek and in Woods Inlet of Lake 

Worth, Fort Worth, Texas ..........................................................................................................15

7. Graphs showing polychlorinated biphenyl (PCB) congener concentrations and 

ratio of individual PCB congener concentrations to the sum of PCB congeners 

(ΣPCBC) at sites 4, 5, and 8 sampled for streambed sediment and site SSO sampled 

for suspended sediment on or near Meandering Road Creek, Lake Worth, Fort 

Worth, Texas, 2004 and 2006 ....................................................................................................16

8. Graphs showing polychlorinated biphenyl (PCB) congener concentrations and 

ratio of individual PCB congener concentrations to the sum of PCB congeners 

(ΣPCBC) at sites 1, 2, and 3 sampled for streambed sediment and sites OF4 and OF4 

Flume sampled for suspended sediment on or near Meandering Road Creek, Lake 

Worth, Fort Worth, Texas, 2004 and 2006 ...............................................................................18

9. Graphs showing polychlorinated biphenyl (PCB) congener concentrations and 

ratio of individual PCB congener concentrations to the sum of PCB congeners 

(ΣPCBC) at 15 sites sampled for lake-bottom sediment (WWD.1–WWD.3 and 

WWD.B1–WWD.B12), site OF5 sampled for suspended sediment, and site LMRC 

sampled for suspended and streambed sediment, Meandering Road Creek and 

Woods Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07 ....................................20

10. Graphs showing total polychlorinated biphenyl (PCB) concentrations (as sum 

of PCB Aroclors [ΣPCBA] and sum of PCB congeners [ΣPCBC]) and estimated 

deposition date for lake-bottom sediment samples from Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2003 and 2006 ...............................................................................22

11. Maps showing total polychlorinated biphenyl (PCB) concentrations as the sum 

of PCB congeners (ΣPCBC) in lake-bottom sediment samples from Woods Inlet of 

Lake Worth, Fort Worth, Texas, 2003 and 2006 ......................................................................23

Tables

1. Relative percent differences of duplicate samples from Meandering Road Creek 

and Woods Inlet of Lake Worth, Fort Worth, Texas, for this report and a previous 

U.S. Geological Survey report .................................................................................................10

2. Porosities, mass accumulation rates, and estimated deposition dates for 2006 

lake-bottom sediment samples and 2003 gravity core samples from Woods Inlet 

of Lake Worth, Fort Worth, Texas ............................................................................................11

Datum

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).
Abstract

Lake Worth is a reservoir on the West Fork Trinity River 

on the western edge of Fort Worth, Texas. Air Force Plant 4 

(AFP4) is on the eastern shore of Woods Inlet, an arm of Lake 

Worth that extends south from the main body of the lake. 

Two previous reports documented elevated polychlorinated 

biphenyl (PCB) concentrations in surficial sediment in Woods 

Inlet relative to those in surficial sediment in other parts of 

Lake Worth. This report presents the results of another USGS 

study, done in cooperation with the U.S. Air Force, to indicate 

the degree of PCB contamination of Meandering Road Creek 

and Woods Inlet and to identify possible sources of PCBs 

in Meandering Road Creek and Woods Inlet on the basis of 

suspended, streambed, and lake-bottom sediment samples 

collected there in 2004 and 2006–07. About 40 to 80 percent 

of total PCB concentrations (depending on how total PCB 

concentration is computed) in suspended sediment exceed 

the threshold effect concentration, a concentration below 

which adverse effects to benthic biota rarely occur. About 20 

percent of total PCB concentrations (computed as sum of three 

Aroclors) in suspended sediment exceed the probable effect 

concentration, a concentration above which adverse effects 

to benthic biota are expected to occur frequently. About 20 to 

30 percent of total PCB concentrations in streambed sediment 

exceed the threshold effect concentration; and about 6 to 20 

percent of total PCB concentrations in lake-bottom (Woods 

Inlet) sediment exceed the threshold effect concentration. No 

streambed or lake-bottom sediment concentrations exceed 

the probable effect concentration. The sources of PCBs to 

Meandering Road Creek and Woods Inlet were investigated 

by comparing the relative distributions of PCB congeners of 

suspended sediment to those of streambed and lake-bottom 

sediment. The sources of PCBs were identified using graphical analysis of normalized concentrations (congener ratios) of 

11 congeners. For graphical analysis, the sampling sites were 

divided into three groups with each group associated with one 

of the three outfalls sampled: SSO, OF4, and OF5. The variations of normalized PCB congener concentrations from Woods 

Inlet, from outfalls along Meandering Road Creek, and from 

streambed sediment sampling sites along Meandering Road 

Creek generally form similar patterns within sample groups, 

which is indicative of a common source of PCBs to each 

group. Overall, the variations in congener ratios indicate that 

PCBs in surficial lake-bottom sediment of Woods Inlet probably entered Woods Inlet primarily from Meandering Road 

Creek, and that runoff from AFP4 is a prominent source of 

PCBs in Meandering Road Creek. Sixteen of the 20 box core 

sites in Woods Inlet had lower PCB concentrations in the 2006 

cores compared to those in the 2003 cores. 

Introduction

Lake Worth is a reservoir on the West Fork Trinity River 

on the western edge of Fort Worth, Tex. Air Force Plant 4 

(AFP4) is on the eastern shore of Woods Inlet, an arm of Lake 

Worth that extends south from the main body of the lake, east 

of Interstate Highway 820 (fig. 1). In August 1990, AFP4 was 

placed on the U.S. Environmental Protection Agency (USEPA) 

National Priorities List of the most serious known hazardous 

waste sites in the Nation due to ground-water contamination 

(U.S. Environmental Protection Agency, 1990). A Preliminary 

Assessment/Site Inspection (PA/SI) and a Remedial Investigation/Feasibility Study (RI/FS) of the site began in October 

1990 to characterize the extent of contamination. In September 

1995, the USEPA and the (then) Texas Natural Resource Conservation Commission approved the RI/FS, and in July 1996, 

a final Record of Decision that detailed possible remedial 

actions was issued (RUST Geotech, 1996).

The Texas Department of Health (TDH) and the Agency 

for Toxic Substances and Disease Registry evaluated the PA/SI 

in July 1998 and concluded that an indeterminate public health 

hazard existed in Lake Worth from exposure to contaminants 

through the food chain (Texas Department of Health, 1998); 

this conclusion was reached after elevated concentrations of 

contaminants, such as polychlorinated biphenyls (PCBs), were 

detected in small, inedible fish species known as mosquito 

fish. In spring 2000, the TDH issued a fish-consumption advisory following fish sampling by the U.S. Geological Survey 

Degree of Contamination and Sources of Polychlorinated 

Biphenyls in Meandering Road Creek and Woods Inlet of 

Lake Worth, Fort Worth, Texas, 2004 and 2006–07

By Christopher L. Braun, Jennifer T. Wilson, and Peter C. Van Metre
2 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Figure 1. Location of Meandering Road Creek, Woods Inlet of Lake Worth, and Air Force Plant 4, Fort Worth, Texas. 

Woods Inlet

TEXAS

Fort

Worth

LOCATION MAP

0 0.25 0.5 MILE

0 0.25 0.5 KILOMETER

32o46'

32o47'

97o27' 97o26' 97o25'

Air Force Plant 4

(AFP4)

West

Fork

River

Lake Worth IH-820

Trinity

Creek

Road

Meandering

Base from U.S. Air Force, Aeronautical Systems Center

AFP4 boundary

EXPLANATION

Generalized direction of

ground-water flow (Garcia, 2005)

Area shown in figures 2, 7-9

Area shown in figure 4

Area shown in figure 11
Introduction 3

(USGS) (Moring, 2002) because high levels of PCBs detected 

in fish samples posed a “significant health risk” (Texas 

Department of Health, 2004). 

The occurrence of PCBs in fish led to an investigation by 

the USGS, in cooperation with the U.S. Air Force (USAF), 

to sample Lake Worth lake-bottom sediment and analyze 

for sediment-associated contaminants, including PCBs. The 

USGS report of that study (Harwell and others, 2003) documented elevated PCB concentrations in surficial sediment in 

Woods Inlet relative to those in surficial sediment in other 

parts of Lake Worth. This finding indicated that the Woods 

Inlet watershed likely contained a source of PCBs. 

In 2003, the USGS conducted a second study, again in 

cooperation with the USAF, in response to the elevated PCB 

concentrations in sediment in Woods Inlet. This study was 

designed to map the distribution of elevated PCB concentrations in Woods Inlet and to identify possible source areas of 

PCBs in the watershed of Woods Inlet. The findings of that 

report (Besse and others, 2005) indicated the highest PCB 

concentrations near the mouth of Meandering Road Creek 

(fig. 2); concentrations decreased consistently from the mouth 

of the creek toward the main body of Lake Worth. This finding 

indicated that PCBs are originating in the Meandering Road 

Creek watershed. Total PCB concentrations in suspended and 

streambed sediment indicated storm drain outfall site OF4, 

which receives runoff from AFP4, as a likely source of PCBs 

to Meandering Road Creek and ultimately Woods Inlet. However, the study did not determine whether site OF4 was the 

only source of PCBs to Meandering Road Creek and Woods 

Inlet. Results from the two previous USGS studies (Harwell 

and others, 2003; Besse and others, 2005) prompted the study 

reported here, conducted in cooperation with the USAF.

Purpose and Scope

The purposes of this report are (1) to indicate the degree 

of PCB contamination of Meandering Road Creek and Woods 

Inlet by comparing concentrations of PCBs in suspended, 

streambed, and lake-bottom sediment samples to consensusbased sediment quality guidelines (SQGs) of MacDonald and 

others (2000), and (2) to identify possible sources of PCBs in 

Meandering Road Creek and Woods Inlet on the basis of concentrations of PCBs in suspended, streambed, and lake-bottom 

sediment samples. Concentrations of PCBs were obtained 

from analyses of stormwater suspended sediment samples 

collected from outfalls to Meandering Road Creek during 

storms in 2004, 2006, and 2007; streambed sediment samples 

collected in Meandering Road Creek in 2004 and 2006; and 

lake-bottom sediment samples collected in Woods Inlet in 

2006. PCB concentrations in samples of the three media also 

are compared to concentrations in samples from the same 

sites in two previous USGS studies (Harwell and others, 2003; 

Besse and others, 2005). Sources of PCBs are identified by 

comparing the relative distributions of PCB congeners (chlorinated compounds, the mixtures of which form PCB Aroclors) 

of suspended sediment to those of streambed and lake-bottom 

sediment samples using graphical analysis. Samples collected 

at some sites also were analyzed for organochlorine pesticides, 

volatile organic compounds, and major and trace elements. 

The analytical results for these constituents are included in the 

appendixes but are not discussed in this report.

Polychlorinated Biphenyls

PCBs were first synthesized in the early 1930s and have 

had widespread industrial uses, primarily as plasticizers, 

hydraulic lubricants, and dielectric fluids in electric capacitors (Smith and others, 1988). Adverse human health effects 

and cancer in animals have been associated with exposure 

to PCBs. The manufacture of PCBs was stopped in 1977 

(Agency for Toxic Substances and Disease Registry, 2001). 

PCBs are hydrophobic contaminants that sorb strongly to 

organic matter and particulates. They commonly are detected 

in urban lakes and reservoir sediments (Van Metre and others, 

1997; Van Metre and others, 1998; Long and others, 2003). 

PCB concentrations in sediment cores from urban lakes typically peak in sediment deposited during the late 1960s, coinciding with the years of greatest PCB use, and then decrease 

in more recently deposited sediment because of restrictions 

imposed during the 1970s (Van Metre and others, 1997; 

Van Metre and others, 1998). 

PCBs are mixtures of a subset of as many as 209 theoretically possible chlorinated compounds, called congeners, with 

various numbers and positions of chlorine atoms attached to 

the biphenyl structure. Each congener has been assigned a 

congener number; congener number increases generally with 

increasing chlorination of the biphenyl structure (fig. 3). 

Mixtures of PCB congeners were commonly marketed and 

sold by the trade name Aroclor. The analytical methods 

applied in this study quantify 27 common PCB congeners 

and three common Aroclor mixtures (1016/1242, 1254, and 

1260). Figure 3 shows the congener compositions of Aroclor 

mixtures 1242, 1254, and 1260 and highlights (in yellow) 

the contributions of the 27 congeners analyzed by the USGS 

National Water Quality Laboratory (NWQL) in these Aroclor 

mixtures.

Site Background and Description of Study Area

AFP4 was built in 1942 to manufacture aircraft and 

encompasses 2.44 square kilometers (km2) of land east of 

Woods Inlet. Waste materials (fuels, oils, solvents, paint 

residues, and spent process chemicals) generated at the plant 

were placed in on-site landfills or burned in fire-training 

exercises prior to 1973 (Texas Department of Health, 1998). 

During the RI/FS, certain areas were identified as having 

contaminant concentrations in soil and sediment that could 

pose a risk to human health or the environment or that exceed 

the lower threshold of a defined acceptable risk range. These 

areas include soils associated with historical landfills 1 and 3 
4 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Base modified from U.S. Geological Survey

Digital orthophoto quarter-quadrangle,

Universal Transverse Mercator projection, Zone 14,

Datum NAD 83, 1-foot resolution 0 0.25 0.5 MILE

0 0.25 0.5 KILOMETER

Lake-bottom sediment 

sampling site and site

identifier

Suspended and streambed

sediment sampling site

and site identifier

Box core (Prefix “WWD.”

not shown)

Box core collected at 2003

gravity core site

B8

WWD.1

OF5B Suspended sediment 

sampling site and outfall 

site identifier

Streambed sediment 

sampling site and site 

identifier

Site 4

LMRC

Suspended sediment and 

water sampling site and 

outfall site identifier

OF4

EXPLANATION

Gruggs arm

Texas National

Guard (TNG) arm

Meandering 

Road Creek

arm

Middle of

Woods Inlet

OF4

LMRC

UMRC

OF5A

OF5B

OF4 Flume

SSO

Site 1

Site 2

Site 3

Site 4

Site 8

Site 5

Site 6

Site 7

B17

B16

B15

B14

B13

B7

B6

B4

B5

B3

B9

B1 B2

B12

B11

B10

B8

WWD.2 WWD.1

WWD.3

Air Force

Plant 4

Woods IH-820

Inlet

Road 

Meandering

Creek

Site of highest polychlorinated

biphenyl concentration ( Besse

and others, 2005, fig. 7)

97o27'30" 97o27'

32o46'

32o47'

32o46'30"

and sediment along Meandering Road Creek and Woods Inlet 

(fig. 4).

Landfill 1, on the east side of Bomber Road, encompasses 

about 2.4 hectares (0.024 km2). It was used as a disposal site 

for construction fill, general waste, and potentially hazardous 

wastes including solvents, thinners, paint, and unspecified 

liquid waste (International Technology Corporation, 2001). 

Fuel and oil also were dumped into several shallow pits 

within landfill 1 and burned. In 1966, landfill 1 was closed, 

and the area was graded and paved to make the west parking 

lot (fig. 4). A part of landfill 1 was excavated in 1983, and 

the excavated material was sent to an off-site disposal facility. Before backfilling the excavated area, a French drain was 

installed to intercept contaminated ground water. A second 

Figure 2. Sampling sites on and near Meandering Road Creek and in Woods Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07. 
Introduction 

5Figure 3. Polychlorinated biphenyl (PCB) congener compositions of three widely used PCB Aroclors. 

Individual PCB congener analyzed by the U.S. Geological Survey National Water Quality Laboratory

EXPLANATION

Individual PCB congener not analyzed by the U.S. Geological Survey National Water Quality Laboratory

1 2 3 4 5 6 7 8 9 Number of chlorine

atoms 10

49

52

70

95

101

110

118

138

146

149

151

170

174

177

180

1838

18

22

26

28

31

33

44

187

194

206

1 209 INCREASING PCB CONGENER NUMBER

86420

1210

WEIGHT PERCENT

86420

1210

WEIGHT PERCENT

86420

1210

WEIGHT PERCENT

PCB Aroclor 1242

PCB Aroclor 1254

PCB Aroclor 1260
6 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Figure 4. Suspended and streambed sediment sampling sites, 2004 and 2006–07, and areas of known polychlorinated biphenyl release 

near Woods Inlet of Lake Worth, Fort Worth, Texas. 

Woods Inlet

OF5A

OF4 Flume

OF4

SSO

Site 1

Site 2

Site 3

Site 4

Site 8

Site 5

Site 6

Site 7

Building 5

West parking lot

Road

OF5B

Building 15

FDTA2

014PCBLK3

005PCBLK1

Building 14

LMRC

Landfill 3

Landfill 1

Bomber Rd.

Meandering

 Creek

Suspended sediment 

sampling site and outfall

site identifier

Streambed sediment 

sampling site and

site identifier

Area of known polychlorinated biphenyl (PCB) 

release (Earth Tech, Inc., 2005)

Storm-sewer line

Storm-sewer location (manhole or drain)

EXPLANATION

FDTA2

SSO

Site 5

Suspended and streambed

sediment sampling site LMRC and site identifier

Base modified from U.S. Geological Survey

Digital orthophoto quarter-quadrangle,

Universal Transverse Mercator projection, Zone 14,

Datum NAD 83, 1-foot resolution 0 0.1 0.2 MILE

0 0.1 0.2 KILOMETER

97°27'

32°46'30''

97°27'15''

32°46'37.5''

32°46'22.5''

97°27'22.5'' 97°27'07.5''

Electrical substation
Approach 7

French drain was installed in an embankment along the eastern 

shoulder of Bomber Road to intercept oily water that would 

have otherwise seeped into a storm sewer that drains to Meandering Road Creek.

Landfill 3, on the west side of Bomber Road, was used as 

a disposal site from 1942 to 1945 for various wastes, including hazardous oils and solvents (International Technology 

Corporation, 2001). Soil and rubble were used to fill and grade 

the site during 1966–67. In 1994, a vacuum-enhanced pumping system was installed by the USAF along the western edge 

of landfill 3 to prevent seepage of ground water and landfill 

leachate into Meandering Road Creek.

Meandering Road Creek borders AFP4 to the west and 

flows north to the Woods Inlet of Lake Worth. Woods Inlet 

is the historical stream channel of Meandering Road Creek, 

which was flooded when the reservoir was impounded. Meandering Road Creek is an intermittent stream that receives runoff from numerous stormwater outfalls (sites SSO, OF4, OF4 

Flume, and OF5 [OF5A and B considered one site]) (fig. 4) 

that drain areas of AFP4, including the two historical landfills (landfills 1 and 3). Ground-water discharge (seeps) along 

the eastern edge of Meandering Road Creek and stormwater 

runoff from urban areas to the south and west of AFP4 also 

contribute to streamflow. The watershed area for Meandering 

Road Creek (4.1 km2) is 46 percent urban (including industrial 

and transportation categories) (Besse and others, 2005, p. 5).

Outfall 5 (OF5) contributes to Meandering Road Creek 

about 25 meters (m) upstream from the point where Meandering Road Creek enters Woods Inlet (fig. 4); OF5 receives 

runoff from parking areas and Building 15. Outfall 4 (OF4) 

contributes to Meandering Road Creek about 200 m upstream 

from the point where Meandering Road Creek enters Woods 

Inlet and receives runoff from buildings, parking areas, and 

landfill 1. The OF4 Flume discharges directly into OF4 but 

does not receive runoff from the west parking lot. The stormsewer outfall (SSO) contributes to Meandering Road Creek 

about 400 m upstream from the point where Meandering Road 

Creek joins Woods Inlet; SSO receives runoff from parking 

areas and landfill 1. 

Two notable PCB leaks or spills have been documented 

on the west side of AFP4 (Earth Tech, Inc., 2005). The first 

spill occurred in March 1984 when the failure of a transformer 

in an electrical substation adjacent to Building 14 (fig. 4; 

014PCBLK3) resulted in the release of an unknown quantity 

of oil containing approximately 10.9 parts per million (ppm) 

of PCBs. Surface-water runoff from this area collects in storm 

drains that eventually discharge to Meandering Road Creek at 

either OF4 or SSO. This spill occurred next to a storm-sewer 

line that ultimately discharges to Meandering Road Creek at 

OF4. 

In March 1989, PCBs were detected beneath a concrete 

slab in Building 5 (fig. 4: 005PCBLK1). Concentrations of 

solvents similar to those observed at landfills 1 and 3 also 

have been detected near the former Fire Department Training 

Area 2 (FDTA2). This training area, north of landfill 1, was 

described as a 50-foot-diameter earthen ring (RUST Geotech, 

1995) that was used for semiannual fire training exercises 

between 1955 and 1965. FDTA2 also might have been used 

for disposal of waste oils and fuels (CH2M Hill, 1984). 

FDTA2 is next to a storm-sewer line that ultimately discharges 

to Meandering Road Creek at OF4.

Acknowledgment

The authors thank Lockheed Martin Corporation for 

access to the sampling sites. 

Approach

PCBs in storm runoff were investigated by sampling 

suspended sediment at four outfalls contributing to Meandering Road Creek (fig. 4) during as many as three storms in 

2004 and by sampling streambed sediment at eight sites along 

Meandering Road Creek within 24 hours of the storm on 

November 16, 2004. This investigation continued in 2006–07 

when suspended sediment samples were collected during two 

storms at three of the four outfalls previously sampled. Suspended sediment samples also were collected from two sites 

in Meandering Road Creek, LMRC and UMRC. Site LMRC 

is near the mouth of Meandering Road Creek (figs. 2, 4) and 

receives runoff from outfalls OF4, OF5, and SSO, landfills 1 

and 3, and urban areas south and west of AFP4. Site UMRC 

is upstream from AFP4 (fig. 2) and receives runoff from urban 

areas but not from AFP4 and for this reason is considered a 

reference site. Streambed sediment samples were collected 

August 29, 2006, from the same eight sites that were sampled 

once in 2004 (sites 1–8; fig. 4) plus sites LMRC and UMRC. 

All streambed sediment samples were analyzed using laboratory methods identical to those described in the previous 

USGS studies at Lake Worth (Harwell and others, 2003; Besse 

and others, 2005).

The contribution of PCBs from Meandering Road Creek 

to Woods Inlet was investigated by sampling lake-bottom 

sediment at 20 sites in 2006 (fig. 2). The 2006 lake-bottom 

sediment sampling sites were the same sites sampled in 

2003 (Besse and others, 2005). Surficial sediment samples 

were collected at each site to determine the change in PCB 

concentrations between 2003 and 2006. All lake-bottom 

sediment samples were analyzed using laboratory methods 

identical to those described in the previous USGS studies 

at Lake Worth (Harwell and others, 2003; Besse and others, 

2005) to allow comparisons between the analytical results. 

Appendix 1 lists all sampling sites, dates, types of samples 

collected, and types of analyses done for this report.

Collection and Processing of Suspended 

Sediment Samples

Suspended sediment samples were collected in 2004 at 

four sites (SSO, OF4 Flume, OF4, and OF5) during as many 
8 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

as three storms. Suspended sediment samples were collected 

in 2006 at five sites (UMRC, LMRC, OF4 Flume, OF4, and 

OF5) during two storms, except OF5, which was sampled only 

during one storm because the runoff during the second storm 

did not contain sufficient sediment to merit sampling, and OF4 

Flume, which generated insufficient storm runoff to collect a 

second sample in 2006. Samples were not collected at SSO 

in 2006 because there was insufficient flow in the drainpipe 

to sample. A suspended sediment sample also was collected 

at OF5 in 2007 to help verify results from a sample collected 

previously (October 10, 2006) for which analytical detection 

levels were unusually high because of small sample mass. The 

sample collected at OF5 on October 10, 2006, was collected 

at the location labeled OF5B in figure 4; all other samples 

collected at OF5 were collected at the location labeled OF5A. 

This small difference in sampling location should not affect 

the results because there is no potential for additional runoff 

contributions between the two locations. 

Suspended sediment samples were collected by filling 

25-liter (L) Nalgene carboys with runoff from the “first flush” 

(initial rise in flow) at each of the sites during a storm. Additional carboys were filled during some storms at some sites 

where suspended sediment concentration was too small (based 

on visual inspection and judgment) to provide a sufficient 

mass of suspended sediment for chemical analyses. The 25-L 

carboys were transported to the USGS office in Fort Worth 

and stored on ice until filtering. Filtering each sample took 

several hours, so processing all samples from a storm typically 

took from 1 to 2 days after the storm. In all, eight environmental samples for suspended sediment were collected in 2004, 

nine environmental samples and one environmental duplicate 

sample were collected in 2006, and one environmental sample 

and one environmental duplicate sample were collected in 

2007 (appendix 2). One of the environmental samples, the 

sample collected at OF5 on August 27, 2006, was destroyed 

before analysis at the laboratory when the sample jar broke.

Sediment was isolated from the water samples by in-line 

filtration following the methods of Mahler and Van Metre 

(2003). The 25-L carboy was agitated to suspend the sediment 

in the stormwater sample and immediately poured into a 25-L 

churn. The churn has a paddle that, with steady motion, keeps 

the sediment suspended and the sample well mixed during 

filtration. As the first 25-L carboy was filtered, additional 

sample was added to the churn from additional carboys, when 

collected. Sediment for the analysis of organic compounds was 

collected on a 293-millimeter (mm) diameter, 0.45-micrometer 

(μm) pore size polytetrafluoroethylene filter in a stainless 

steel filter holder. Water was pumped from the churn with a 

peristaltic pump through the filter until the filter clogged. The 

volume of water that passed though the filter was noted. The 

filter was removed from the holder and placed in a locking 

plastic bag with 10 to 20 milliliters (mL) of deionized water. 

The filter was gently massaged in the bag to release the sediment from the filter. This process was repeated, usually three 

to six times, until approximately 2 to 5 grams dry sediment 

mass was isolated for analysis. The sediment slurry was then 

poured into a 125-mL glass IChem jar for organic and inorganic analyses. The samples for organic analysis were allowed 

to settle for approximately 4 days under refrigeration at which 

point the overlying water was decanted with a sterile glass 

pipette, and the samples were sent chilled to the NWQL. 

Collection and Processing of Streambed 

Sediment Samples

Streambed sediment samples were collected on November 16, 2004, and again on August 29, 2006. Eight environmental samples and one duplicate sample were collected on 

November 16, 2004. Ten environmental samples and two 

duplicate samples were collected on August 29, 2006 (appendix 2). Streambed sediment samples were collected using a 

pre-cleaned nylon spoon to scoop subsamples of fine-grained 

sediment from the streambed in depositional areas (Shelton 

and Capel, 1994). The subsamples from each site were put into 

wide-mouth glass jars and taken to the USGS laboratory in 

Fort Worth for processing in 2004 and to the USGS laboratory 

in Austin, Tex., in 2006. At each site, 2 L of native water was 

collected for sieving the samples. In the laboratory, the sediment from each site was poured into a large pre-cleaned Pyrex 

mixing bowl and homogenized with a Teflon spatula. The 

material was sieved using a 2-mm mesh stainless steel sieve, 

and the fraction less than 2 mm was collected in a 250-mL 

baked-glass jar for analysis of organic compounds. Samples 

for analysis of organic compounds were shipped chilled to the 

NWQL. 

Collection and Processing of Lake-Bottom 

Sediment Samples

Seventeen of the 20 lake-bottom sediment sampling 

sites in Woods Inlet were sampled for surficial sediment only 

(top 1 or 2 centimeters [cm]; labeled B1–17 in fig. 2), which 

was collected with a 14- by 14- by 20-cm Wildco box corer. 

The box cores were subsampled on-site by vertical extrusion 

and sectioning following the methods of Van Metre and 

others (2004). Samples for analysis of organic compounds 

were transferred to a baked-glass jar and chilled pending shipment to the NWQL. 

Box cores also were collected at three sites sampled by 

gravity core in 2003 (Besse and others, 2005) to continue an 

investigation of historical trends of sediment-associated contaminants (fig. 2). The 2003 gravity cores were collected in the 

main body of Woods Inlet (site WWD.1) and in the two largest 

tributary arms, Gruggs arm (site WWD.2) and Meandering 

Road Creek arm (site WWD.3). Gravity corers are used to 

collect deep sediment deposits, typically penetrating the entire 

lacustrian sediment thickness down to the pre-reservoir land 

surface; thus a sample of sediment deposited at the collection 

site from the date of reservoir construction to the gravity core 

collection date is obtained. 
Approach 9

When the three gravity coring sites were revisited in 

2006, cores were collected using a 14- by 14- by 20-cm 

Wildco box corer. The box cores were subsampled on-site by 

vertical extrusion of the sediment in measured intervals using 

a piston fit into the bottom of the liner. The box cores were 

subsampled from 0 to 1, 1 to 3, 3 to 5, 5 to 10, and 10 to 15 cm 

(10- to 13-cm bottom interval at site WWD.3). Sampling tools 

were washed between each sample interval using phosphatefree detergent and native water. Samples for analyses of 

organic compounds were transferred to baked-glass jars and 

chilled pending shipment to the NWQL. 

Analytical Methods

PCBs were extracted, isolated, and analyzed using 

the procedures of Noriega and others (2003). Briefly, wet 

lake-bottom sediment was extracted overnight with dichloromethane in a Soxhlet apparatus. The extract was reduced 

in volume and filtered. An aliquot of the sample extract was 

quantitatively injected into a polystyrene-divinylbenzene gel 

permeation column (GPC) and eluted with dichloromethane 

to remove sulfur and partially isolate the target analytes from 

coextracted high-molecular-weight interferents such as humic 

substances. The aliquot was further split into two fractions by 

combined alumina/silica adsorption chromatography followed 

by a micro Florisil column cleanup step prior to determination 

of the PCBs by dual capillary-column gas chromatography 

with electron capture detection (GC-ECD) (Olson and others, 

2004). PCBs were reported as individual Aroclor (1016/1242, 

1254, or 1260) equivalents (Noriega and others, 2003). 

For this report, fraction 1 (PCB fraction) of the organiccompound analysis was analyzed for 27 selected (of 209 

possible) PCB congeners (fig. 3) along with the other fraction 

1 analytes (PCB Aroclors) during GC-ECD analysis. The 

congeners chosen for this analysis were some of the more 

dominant congeners in widely used Aroclors (1016/1242, 

1254, and 1260). In addition to the dominance of these congeners, potential co-elution issues and signal response for this 

analytical method were considered. A series of dilutions of a 

custom mixture containing the 27 selected PCB congeners was 

used to make the calibration standards. Calibration standards 

were prepared at four concentrations, and a minimum of three 

points were used for the calibration curves. An additional 

congener solution, prepared at a concentration that was midrange on the curve, was used as a check standard to verify the 

calibration curve. 

The laboratory reporting level for PCB Aroclors was 5.0 

micrograms per kilogram (μg/kg); however, variations in sample mass, sample matrix, and analytical interferences raised 

reporting levels as high as 720 μg/kg. A laboratory reporting 

level has not been established for individual congeners (W.T. 

Foreman, U.S. Geological Survey, written commun., 2001); 

however, it is believed to be conservatively about 1.0 μg/kg 

(M.C. Noriega, U.S. Geological Survey, oral commun., 2003). 

Congener concentrations less than the reporting level were 

quantified when the analyst was confident in the detection; 

those values were identified in the data tables in appendix 2 as 

estimated (E). A comparison of all suspended, streambed, and 

lake-bottom sediment samples indicated that the sum of the 

27 congeners accounted for 57 percent (average, ±6 percent [1 

standard deviation]) of the sum of the Aroclors.

Quality Control 

Quality control for PCB analyses consisted of analyzing a 

laboratory blank sample, a spiked sample, and a duplicate, and 

monitoring recovery of surrogate compounds with each set of 

12 environmental samples (Noriega and others, 2003; Olson 

and others, 2004). There were no detections of PCBs in the 

blank samples. Median spike recoveries were 96 percent for 

PCBs and spike recoveries were within control limits for 76 

percent of the spike results. 

Analytical results from two types of duplicate samples 

are included in this report—environmental duplicates and 

laboratory duplicates (appendix 3). An environmental duplicate is a sample that is split into two jars at the time of collection; both jars are submitted to the laboratory for analysis. 

A laboratory duplicate is a single sample that is split by the 

laboratory during preparation and analyzed in duplicate. 

Although the analytical methods of organic compound analysis were the same for all sediment samples, sample mass was 

small enough for suspended sediment samples that reporting 

levels and precision were affected, and therefore relatively few 

suspended sediment duplicate samples were analyzed. Nine 

environmental duplicate samples were analyzed for PCBs—

two suspended sediment, three streambed sediment, and four 

lake-bottom sediment samples. A summary of the relative 

percent differences (RPDs) of the duplicate sample analyses 

for this report and a previous USGS report for Woods Inlet of 

Lake Worth (Besse and others, 2005) is in table 1. The median 

RPDs for this report are greater than those of the previous 

report for core sediment samples, appreciably less for surficial bottom sediment samples, about the same for streambed 

sediment samples, and appreciably less for suspended sediment samples. Only the original, and not the duplicate, sample 

results are used in the calculations and figures in this report.

Age-Dating Lake-Bottom Sediment Samples 

The deposition dates of the lake-bottom sediment 

samples collected at sites WWD.1, WWD.2, and WWD.3 

were estimated using sediment mass accumulation rates 

(MARs) calculated for the lake-bottom sediment gravity cores 

collected at the same sites in 2003 (Besse and others, 2005, 

appendix 1.1). Briefly, the 2003 gravity cores were age-dated 

using the pre-reservoir boundary, 137Cesium (137Cs) concentrations, sediment porosity and mass, and an exponential model 

to account for decreasing sedimentation rate over time as the 

reservoir shoreline stabilizes (Callender and Robbins, 1993; 

Van Metre and others, 2004). The lake-bottom sediment 
10 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

samples collected for this report were not analyzed for 137Cs 

to recalculate MARs and deposition dates because limited 

depth intervals were sampled. Instead, the MARs calculated 

for the most recently deposited sediments in the 2003 gravity 

cores were used in conjunction with the sediment porosity and 

mass of the 2006 box cores to estimate age dates. A constant 

MAR was assumed for each 2006 box core. Table 2 lists the 

porosities, MARs, and estimated deposition dates for the lakebottom sediment samples collected in 2003 and 2006.

Degree of Contamination and Sources 

of Polychlorinated Biphenyls

Concentrations of total PCBs in suspended, streambed, 

and lake-bottom sediment samples were compared to consensus-based sediment quality guidelines (SQGs) of MacDonald 

and others (2000) to provide a general indication of the degree 

of contamination. Two consensus-based SQGs are defined: 

the threshold effect concentration (TEC) and the probable 

effect concentration (PEC). The TEC is the concentration 

below which adverse effects to benthic biota rarely occur, and 

the PEC is the concentration above which adverse effects to 

benthic biota are expected to occur frequently (MacDonald 

and others, 2000). The SQGs were derived through various 

laboratory, field, and theoretical methods and are not definitive for determining sediment toxicity to benthic biota nor are 

they to be extrapolated to assess adverse effects to fish, aquatic 

plants, or humans (Long and others, 1995; MacDonald and 

others, 2000). Although the SQGs provide a general indication 

of the degree of contamination, they do not provide a benchmark for concern for accumulation in fish or for human health 

risk associated with eating fish.

Total PCBs were computed in two ways: as the sum of 

the three Aroclors (ΣPCBA) or as the sum of the 27 reported 

congeners (ΣPCBC). Estimated concentrations were used as 

reported, and nondetections were treated as zeros in the computation of ΣPCBA and ΣPCBC. The ΣPCBA typically is larger 

than ΣPCBC for the following reasons: First, only 27 of 209 

possible congeners are analyzed for by the USGS NWQL, so 

ΣPCBC accounts for only 13 percent of total possible congeners. Second, individual congeners are present at much lower 

concentrations than Aroclors, so it is more likely that individual congeners will not be detected. Detection frequencies 

for the 27 PCB congeners analyzed for in this report varied 

by the degree of chlorination and by sample type. In general, detection frequency increased with increasing degree of 

chlorination and was higher in surficial lake-bottom sediment 

samples than in suspended and streambed sediment samples 

(appendix 2).

The concentrations of ΣPCBA and ΣPCBC in suspended, 

streambed, and lake-bottom sediment samples are compared to the TEC for total PCB (59.8 μg/kg) (MacDonald 

and others, 2000) in figure 5; nondetections were treated as 

zeros. Samples with ratios greater than 1 in figure 5 contain 

concentrations that exceed the TEC. Suspended sediment 

concentrations exceed the TEC for 76 percent of the samples 

when comparing the ΣPCBA to the TEC and for 41 percent 

of the samples when comparing the ΣPCBC to the TEC. The 

concentrations of ΣPCBA for 24 percent of the suspended 

sediment samples exceed the PEC for total PCBs (676 μg/kg). 

There are fewer streambed and lake-bottom sediment samples 

than suspended sediment samples with total PCB concentrations greater than the TEC and none are greater than the PEC. 

ΣPCBA concentrations in streambed sediment samples exceed 

the TEC for 33 percent of the samples, and ΣPCBC in streambed sediment samples exceed the TEC for 17 percent of the 

Table 1. Relative percent differences of duplicate samples from Meandering Road Creek and Woods Inlet of Lake Worth, Fort Worth, 

Texas, for this report and a previous U.S. Geological Survey report (Besse and others, 2005).

[(n), number of samples; RPDs, relative percent differences; PCB, polychlorinated biphenyl]

Suspended sediment Streambed sediment Lake-bottom sediment samples samples samples

Constituent

Core sediment Surficial bottom sediment

Mini- Maxi- Median Mini- Maxi- Median 

mum mum (n) mum mum (n) Mini- Maxi- Median Mini- Maxi- Median 

mum mum (n) mum mum (n)

RPDs from this study

PCB Aroclors 6 34 26 (2) 0 40 15 (3) 14 61 19 (2) 0 46 8 (2)

PCB congeners 0 33 10 (2) 0 55 27 (3) 0 94 24 (2) 0 26 7 (2)

RPDs from Besse and others (2005)

PCB Aroclors 70 80 1

75 (1) 0 87 113 (6) 0 16 112 (4) 26 29 128 (1)

PCB congeners 5 133 136 (1) 0 130 125 (6) 0 156 112 (4) 0 70 121 (1)

1

 Besse and others (2005, table 3).
Degree of Contamination and Sources of Polychlorinated Biphenyls 11

Table 2. Porosities, mass accumulation rates, and estimated deposition dates for 2006 lake-bottom sediment samples and 2003 gravity 

core samples from Woods Inlet of Lake Worth, Fort Worth, Texas.

[ID, identifier; cm, centimeter; MAR, mass accumulation rate; g/cm2-yr, grams per square centimeter per year]

Collection 

date

Sample ID 

and interval 

(cm)

Mid-depth 

(cm)

Thickness 

(cm) Porosity MAR (g/cm2

-yr)

Estimated 

deposition date 

(year)

2006 WWD.1 0–1 0.5 1 0.91 0.6 2006.5

WWD.1 1–3 2 2 .91 .6 2006.0

WWD.1 3–5 4 2 .86 .6 2005

WWD.1 5–10 7.5 5 .89 .6 2004

WWD.1 10–15 12.5 5 .79 .6 2001

2003 WWD1 (0–5) 2.5 5 .87 .62 2002

WWD1 (5–10) 7.5 5 .79 .64 1999

WWD1 (10–20) 12.5 10 .81 .68 1994

WWD1 (20–30) 25 10 .80 .72 1988

WWD1 (30–40) 35 10 .79 .76 1982

WWD1 (40–50) 45 10 .77 .81 1976

2006 WWD.2 0–1 .5 1 .81 .7 2006.4

WWD.2 1–3 2 2 .74 .7 2005

WWD.2 3–5 4 2 .84 .7 2004

WWD.2 5–10 7.5 5 .68 .7 2001

WWD.2 10–15 12.5 5 .68 .7 1996

2003 WWD2 (0–5) 2.5 5 .79 .74 2002

WWD2 (5–10) 7.5 5 .80 .77 1999

WWD2 (10–20) 15 10 .80 .82 1994

WWD2 (20–30) 25 10 .75 .88 1988

WWD2 (30–40) 35 10 .75 .95 1982

WWD2 (40–50) 45 10 .71 1.03 1976

2006 WWD.3 0–1 .5 1 .80 .65 2006.4

WWD.3 1–3 2 2 .75 .65 2005

WWD.3 3–5 4 2 .71 .65 2004

WWD.3 5–10 7.5 5 .66 .65 2001

WWD.3 10–13 11.5 3 .65 .65 1996

2003 WWD3 (0–5) 2.5 5 .76 .67 2001

WWD3 (5–10) 7.5 5 .65 .71 1996

WWD3 (10–20) 15 10 .70 .76 1988

WWD3 (20–30) 25 10 .71 .83 1979

WWD3 (30–40) 35 10 .71 .90 1971

WWD3 (40–50) 45 10 .69 .97 1964
12 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Figure 5. Ratios of total polychlorinated biphenyl (PCB) concentrations (as sum of three Aroclors [ΣPCBA] and as sum of 27 

reported congeners [ΣPCBC]) to threshold effect concentration (TEC), a consensus-based sediment quality guideline (MacDonald 

and others, 2000) for suspended, streambed, and lake-bottom sediment samples collected from Meandering Road Creek and 

Woods Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07. 

ΣPCB = TEC

ΣPCB = TEC

0

2

4

6

8

10

12

14

16

18

RATIO OF 

ΣPCBA AND 

ΣPCBC TO TEC

0

0.5

1

1.5

2

2.5

3

AROCLORS

CONGENERS

AROCLORS

CONGENERS

08/29/2006 (ND, Aroclors

and congeners)

11/16/2004 (ND, congeners)

08/29/2006 (ND, congeners)

11/16/2004 (ND, Aroclors

and congeners) 

08/29/2006

11/16/2004 

08/29/2006

11/16/2004 

08/29/2006

11/16/2004 

08/29/2006

11/16/2004 

08/29/2006

11/16/2004 

08/29/2006

11/16/2004 

08/29/2006

08/29/2006

UMRC

Site 7 

Site 6 

Site 5 

Site 8 

Site 4 

Site 3 

Site 2 

Site 1 

LMRC

EXPLANATION

ND Nondetection at laboratory reporting level

SUSPENDED SEDIMENT

SAMPLES

STREAMBED SEDIMENT

SAMPLES

EXPLANATION

Site and sampling date

UMRC

08/27/2006 (ND, Aroclors

and congeners)

10/10/2006 (ND, Aroclors

and congeners)

SSO

11/16/2004

12/06/2004

OF4 Flume

11/16/2004

12/06/2004

08/27/2006

OF4

10/22/2004

11/16/2004

12/06/2004

08/27/2006

10/10/2006

OF5 (A and B)

10/22/2004 (A) 

10/10/2006 (B)

05/24/2007 (A)

LMRC

08/27/2006 (ND, Aroclors

and congeners)

10/10/2006 

 Site and sampling date
Degree of Contamination and Sources of Polychlorinated Biphenyls 13

Figure 5.—Continued. 

0–1

1–3

3–5

5–10

10–15

0–1

1–3

3–5

5–10

10–15

0–1

1–3

3–5

5–10

10–13

WWD.1

WWD.2

WWD.3

EXPLANATION

B1

B2

B3

B4

B5

B6

B7

B8

B9

B10

B11

B12

B13 (ND, congeners)

B14

B16

B17 (ND, congeners)

EXPLANATION

Note: Prefix “WWD.” not

 shown.

 Symbols offset for

 illustrative purposes.

 All samples collected

 08/26/2006.

B15 (ND, Aroclors

and congeners)

Note: All samples collected

 08/26/2006.

ΣPCB = TEC

ΣPCB = TEC

0

1

2

3

4

5

6

7

8

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

AROCLORS

CONGENERS

AROCLORS

CONGENERS

LAKE-BOTTOM SEDIMENT

SAMPLES - BOX CORES

LAKE-BOTTOM SEDIMENT

SAMPLES - BOX CORES COLLECTED

AT 2003 GRAVITY CORE SITES

 Site and identifier Site and sample interval, in

 centimeters, at each site
14 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

samples. ΣPCBA and ΣPCBC concentrations in lake-bottom 

sediment samples exceed the TEC for 22 and 3 percent of the 

samples, respectively. 

Potential sources of PCBs include historical landfills or 

historically contaminated soils on AFP4 and point or nonpoint 

sources in the surrounding urban area. Total PCB concentrations in suspended and streambed sediment samples varied 

greatly among sites and indicate likely sources of PCBs 

associated with sites SSO, OF4, and OF5, which receive 

runoff from AFP4 (fig. 6; appendix 2). Because runoff entering Meandering Road Creek from some parts of AFP4 was 

not sampled for this report, sites SSO, OF4, and OF5 might 

not be the only sources of PCBs from AFP4 to Meandering 

Road Creek and Woods Inlet of Lake Worth. For UMRC, the 

site receiving drainage from the surrounding urban area but 

not influenced by runoff from AFP4, no PCB congeners were 

detected in any of the three samples (one streambed sediment 

and two suspended sediment) collected there. In contrast, 

the two suspended sediment samples from SSO contained 

ΣPCBC concentrations (estimated) of 32 and 37 μg/kg; the five 

suspended sediment samples from OF4 contained ΣPCBC concentrations (estimated) of 18, 220, 310, 25, and 160 μg/kg; and 

the three suspended sediment samples from OF5 contained 

ΣPCBC concentrations (estimated) of 29, 330, and 93 μg/kg. 

The two suspended sediment samples from LMRC, influenced 

by flow at UMRC, SSO, OF4, and OF5 (AFP4 runoff), yielded 

ΣPCBC concentrations of no detection (less than 27 μg/kg) and 

29 μg/kg (estimated). 

Because PCBs are hydrophobic, the primary way for 

them to enter urban creeks and lakes is erosion and fluvial 

transport attached to sediment. The most likely way for them 

to enter Woods Inlet is on suspended sediment in storm runoff 

that is directed to Woods Inlet by Meandering Road Creek. 

The sources of PCBs to Meandering Road Creek and 

Woods Inlet were investigated by comparing the relative distributions of PCB congeners of suspended sediment to those of 

streambed and lake-bottom sediment. Congener assemblages 

can be indicative of different PCB sources (Colman, 2000; 

Johnson and others, 2000; Cacela and others, 2002). PCB 

congener distributions were not examined for lake-bottom 

sediment samples deeper than 1.5 cm from sites WWD.1, 

WWD.2, and WWD.3 because the deeper sediments were 

deposited before the suspended and streambed samples

collected in 2006 (table 2). Samples with numerous nondetections also were excluded because of their limited use 

for comparison purposes. PCB congener distributions were 

determined by normalizing individual congener concentrations 

with ΣPCBC (dividing individual congener concentrations by 

ΣPCBC). The assumption was made that relative concentrations of PCB congeners do not change appreciably (that is, 

no degradation or desorption of selected congeners) during 

transport and deposition, except by mixing. 

The sources of PCBs were identified using graphical 

analysis of normalized concentrations (congener ratios) of 11 

selected congeners (figs. 7–9). The 11 congeners were selected 

on the basis of their detection frequency, range of chlorination, concentrations, and concentration variation between sites. 

For graphical analysis, the sampling sites were divided into 

three groups with each group associated with one of the three 

outfalls sampled: SSO, OF4, and OF5. The groupings were 

generally based on proximity of creek and inlet sites to the 

outfalls. The variations of normalized PCB congener concentrations from Woods Inlet, from outfalls along Meandering 

Road Creek, and from streambed sediment sampling sites 

along Meandering Road Creek generally form similar patterns 

within sample groups, which is indicative of a common source 

of PCBs to each group. 

The first of these three groups is associated with SSO 

(fig. 7) and includes the suspended sediment site SSO and 

streambed sediment sites 4, 5, and 8. The SSO group shows a 

congener ratio pattern dominated by the hexachlorobiphenyl 

congener 138 and to a lesser extent the pentachlorobiphenyl 

congeners 110 and 118. The more highly chlorinated 

heptachlorbiphenyl congeners, such as 170, 180, and 187, 

were either not detected or were detected at much lower 

concentrations. 

The second group is associated with OF4 (fig. 8) and 

includes suspended sediment sites OF4 and OF4 Flume 

(which drains directly to OF4) and streambed sediment sites 1, 

2, and 3. This group shows a distinctly different congener ratio 

pattern compared to the SSO group, specifically an increasing 

degree of chlorination. Congener 110 is slightly less prominent, and congeners 170, 180, and 187 are more prominent. 

This trend is not apparent for site 3, which seems to more 

closely resemble the SSO group; but this is not unexpected 

because site 3 is upstream from OF4 and was included in the 

OF4 group on the basis of geographic proximity.

The third group is associated with OF5 (fig. 9) and 

includes suspended sediment site OF5 (sampled at OF5A and 

OF5B), suspended and streambed sediment site LMRC, and 

four groups of lake-bottom sediment sites associated with 

four regions of Woods Inlet. The Gruggs arm of Woods Inlet 

contains WWD.2, B1, B2, and B3; the TNG arm includes B4 

and B5; the Meandering Road Creek arm includes WWD.3, 

B6, B7, B8, and B9; and the middle of Woods Inlet contains 

WWD.1, B10, B11, and B12. The congener ratio patterns of 

the OF5 group do not show any trend common to the entire 

group. The OF5A and OF5B samples are characterized 

predominantly by the more highly chlorinated PCB congeners (170, 180, and 187). PCB congeners such as 110, 118, 

and 138 that were more prevalent at outfalls farther upstream 

(SSO and OF4) were either not detected for OF5 or detected 

at much lower concentrations, resulting in smaller ratios. The 

OF5 pattern does not carry over to the inlet sites. However, the 

congener ratio pattern for LMRC, the creek site closest to the 

Meandering Road Creek arm of Woods Inlet, is almost identical to the congener ratio pattern for the Meandering Road 

Creek arm of the inlet.

Overall, the variations in congener ratios indicate 

that PCBs in surficial lake-bottom sediment of Woods 

Inlet probably entered Woods Inlet primarily from Meandering Road Creek, and that runoff from AFP4 is a prominent 
Degree of Contamination and Sources of Polychlorinated Biphenyls 15 Figure 6. Total polychlorinated biphenyl (PCB) concentrations in suspended and streambed sediment samples from Besse and others (2005) and this report collected at sites on and near Meandering Road Creek and in Woods Inlet of Lake Worth, Fort Worth, Texas. 

UMRC

Site 7

Site 6

Site 5

SSO

Site 8

Site 4

Site 3

OF4 Flume

OF4

Site 2

Site 1

OF5

LMRC

TOTAL PCB CONCENTRATION,

IN MICROGRAMS PER KILOGRAM

0

800600400200

1,200

1,000

0

800600400200

1,2001,000

Total PCB—Sum of Aroclors

Total PCB—Sum of congeners

08/30/200309/11/200310/05/200310/22/200411/16/200412/06/200408/27–08/29/200610/10/2006

05/24/2007

EXPLANATION

Besse andothers (2005)

This report

Triangle symbol indicates suspendedsediment sample.Circle symbol indicates streambedsediment sample.Symbol without fill color indicatesnondetection at laboratory reporting level
16 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Figure 7. Polychlorinated biphenyl (PCB) congener concentrations and ratio of individual PCB congener concentrations to the sum of 

PCB congeners (ΣPCBC) at sites 4, 5, and 8 sampled for streambed sediment and site SSO sampled for suspended sediment on or near 

Meandering Road Creek, Lake Worth, Fort Worth, Texas, 2004 and 2006. 

Suspended sediment 11/16/2004

Suspended sediment 12/06/2004

Streambed sediment 11/16/2004

Streambed sediment 08/29/2006

EXPLANATION

Line graph symbol and

corresponding sampling date

RATIO OF INDIVIDUAL 

CONGENER CONCENTRATION

TO ΣPCBC

PCB CONGENER CONCENTRATION,

STREAMBED OR SUSPENDED 

SEDIMENT, IN MICROGRAMS

PER KILOGRAM 

Bar graph symbol and corresponding

sampling date

11/16/2004

12/06/2004

08/29/2006

PCB CONGENER CONCENTRATION, IN MICROGRAMS PER KILOGRAM

RATIO OF INDIVIDUAL PCB CONGENER CONCENTRATION TO ΣPCBC

PCB CONGENER IDENTIFICATION NUMBER

ND Nondetection at

 laboratory reporting

 level

ND ND ND

ND ND

NDND NDND ND ND ND ND NDND ND NDND

ND ND ND

Site 5

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

52 95 101 110 118 138 149 151 170 180 187

16

14

12

10

8

6

4

2

0

SSO

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45 16

14

12

10

8

6

4

2

0

Site 8

0

1

2

3

4

5

6

7

8

9

10

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0

5

10

15

20

25

30

Site 4

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45
Degree of Contamination and Sources of Polychlorinated Biphenyls 17

Figure 7.—Continued. 

Base modified from U.S. Geological Survey

Digital orthophoto quarter-quadrangle,

Universal Transverse Mercator projection, Zone 14,

Datum NAD 83, 1-foot resolution 0 0.25 0.5 MILE

0 0.25 0.5 KILOMETER

Site 4

Site 8

Site 5

SSO

Sampling site and 

identifier (by type)

Suspended sediment

Streambed sediment 

Site 5

SSO

EXPLANATION

Air Force

Plant 4

Woods IH-820

Inlet

Road 

Meandering

Creek

97o27'30" 97o27'

32o46'

32o47'

32o46'30"
18 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Figure 8. Polychlorinated biphenyl (PCB) congener concentrations and ratio of individual PCB congener concentrations to the sum 

of PCB congeners (ΣPCBC) at sites 1, 2, and 3 sampled for streambed sediment and sites OF4 and OF4 Flume sampled for suspended 

sediment on or near Meandering Road Creek, Lake Worth, Fort Worth, Texas, 2004 and 2006. 

Suspended sediment 10/22/2004

Suspended sediment 11/16/2004

Streambed sediment 11/16/2004

Streambed sediment 08/29/2006

EXPLANATION

Line graph symbol and

corresponding sampling date

RATIO OF INDIVIDUAL 

CONGENER CONCENTRATION 

TO ΣPCBC

Suspended sediment 12/06/2004

Suspended sediment 08/27/2006

Suspended sediment 10/10/2006

PCB CONGENER CONCENTRATION,

STREAMBED OR SUSPENDED 

SEDIMENT, IN MICROGRAMS 

PER KILOGRAM

Bar graph symbol and

corresponding sampling date

11/16/2004

12/06/2004

08/29/2006 (streambed); 

08/27/2006 (suspended)

10/22/2004

10/10/2006

ND Nondetection at

 laboratory reporting

 level

PCB CONGENER IDENTIFICATION NUMBER

52 95 101 110 118 138 149 151 170 180 187

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0

2

4

6

8

10

12

14

16

18

20

0

10

20

30

40

50

60

0

10

20

30

40

50

60

70

80

0

1

2

3

4

5

6

7

8

PCB CONGENER CONCENTRATION, SUSPENDED SEDIMENT, IN MICROGRAMS PER KILOGRAM

RATIO OF INDIVIDUAL PCB CONGENER CONCENTRATION TO ΣPCBC

0

1

2

3

4

5

6

ND

ND

ND

ND

ND ND

ND ND ND

ND ND ND

ND ND ND ND

ND ND

NDND

ND

ND

ND

ND

ND

ND

ND

ND

ND

ND

Site 3

Site 2

Site 1

OF4

OF4 Flume
Degree of Contamination and Sources of Polychlorinated Biphenyls 19

Figure 8.—Continued. 

Base modified from U.S. Geological Survey

Digital orthophoto quarter-quadrangle,

Universal Transverse Mercator projection, Zone 14,

Datum NAD 83, 1-foot resolution 0 0.25 0.5 MILE

0 0.25 0.5 KILOMETER

Site 1

Site 2

Site 3

OF4

OF4 Flume

Sampling site and 

identifier (by type)

Suspended sediment

Streambed sediment 

Site 1

OF4

EXPLANATION

Air Force

Plant 4

Woods IH-820

Inlet

Road 

Meandering

Creek

97o27'30" 97o27'

32o46'

32o47'

32o46'30"
20 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Figure 9. Polychlorinated biphenyl (PCB) congener concentrations and ratio of individual PCB congener concentrations to the sum of 

PCB congeners (ΣPCBC) at 15 sites sampled for lake-bottom sediment (WWD.1–WWD.3 and WWD.B1–WWD.B12), site OF5 sampled for 

suspended sediment, and site LMRC sampled for suspended and streambed sediment, Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07. 

Gruggs TNG

WWD.2

B1

B2

B3

B4

B5

EXPLANATION

Line graph symbol 

and corresponding 

lake-bottom 

sediment sample

EXPLANATION

Line graph symbol 

and corresponding 

lake-bottom 

sediment sample

WWD.1

B10

B11

B12

EXPLANATION

Line graph symbol 

and corresponding 

lake-bottom 

sediment sample

WWD.3

B6

B7

B8

B9

Note: All samples 

 collected 

 08/28/2006

ND Nondetection at

 laboratory reporting

 level

PCB CONGENER

CONCENTRATION,

LAKE BOTTOM SEDIMENT,

IN MICROGRAMS PER

KILOGRAM

Color of bar graph symbol 

corresponds to color of line

graph symbol for each sample

EXPLANATION

52 95 101 110 118 138 149 151 170 180 187

PCB CONGENER IDENTIFICATION NUMBER

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0

2

4

6

8

10

12

14

16

18

20

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

RATIO OF INDIVIDUAL PCB CONGENER CONCENTRATION TO ΣPCBC

PCB CONGENER CONCENTRATION (DEPICTED AS BAR GRAPHS), IN MICROGRAMS PER KILOGRAM

Meandering Road

Creek arm

Middle of Woods Inlet

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0

Gruggs and Texas National Guard 

(TNG) arms of Woods Inlet All ND ND NDND ND ND NDND ND ND ND

ND

ND

NDND ND ND

ND

ND

All ND

ND

NDNDNDND

ND

ND

ND

ND

ND

All ND

All ND

All ND

ND

ND

ND

ND

ND

ND

ND
Degree of Contamination and Sources of Polychlorinated Biphenyls 21

Figure 9.—Continued. 

Suspended sediment 10/22/2004

(collected at OF5A)

EXPLANATION

Line graph symbol and

corresponding sampling date

Suspended sediment 10/10/2006

(collected at OF5B)

Suspended sediment 05/24/2007

(collected at OF5A)

RATIO OF INDIVIDUAL

CONGENER CONCENTRATION TO ΣPCBC

PCB CONGENER

CONCENTRATION,

SUSPENDED SEDIMENT,

IN MICROGRAMS PER

KILOGRAM

Bar graph symbol and

corresponding sampling date

10/22/2004

10/10/2006

05/24/2007

52 95 101 110 118 138 149 151 170 180 187

PCB CONGENER IDENTIFICATION NUMBER

52 95 101 110 118 138 149 151 170 180 187

PCB CONGENER IDENTIFICATION NUMBER

PCB CONGENER CONCENTRATION (DEPICTED

AS BAR GRAPHS), IN MICROGRAMS PER KILOGRAM

RATIO OF INDIVIDUAL PCB CONGENER

CONCENTRATION TO ΣPCBC

PCB CONGENER CONCENTRATION (DEPICTED

AS BAR GRAPHS), IN MICROGRAMS PER KILOGRAM

RATIO OF INDIVIDUAL PCB CONGENER

CONCENTRATION TO ΣPCBC

OF5A and OF5B

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0

10

20

30

40

50

60

70

80

90

100 ( 1.0)

LMRC

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0

2

4

6

8

10

12

14

Base modified from U.S. Geological Survey

Digital orthophoto quarter-quadrangle,

Universal Transverse Mercator projection, Zone 14,

Datum NAD 83, 1-foot resolution

0 0.25 0.5 MILE

0 0.25 0.5 KILOMETER

LMRC OF5A

OF5B

B7

B6

B4

B5

B3 B9

B1 B2

B12

B11

B10

B8

WWD.2 WWD.1

WWD.3

Gruggs arm

Texas National

Guard (TNG) arm

Meandering 

Road Creek

arm

Middle of

Woods Inlet

Lake-bottom sediment 

sampling site and site

identifier

Suspended and streambed

sediment sampling site

and site identifier

Box core (Prefix “WWD.”

not shown)

Box core collected at 2003

gravity core site

B8

WWD.1

OF5B Suspended sediment 

sampling site and outfall 

site identifier

LMRC

EXPLANATION

Air Force

Plant 4

Woods IH-820

Inlet

Road 

Meandering

Creek

97o27'30" 97o27'

32o46'

32o47'

32o46'30"

Streambed sediment 08/29/2006

Suspended sediment 10/10/2006

EXPLANATION

Line graph symbol and

corresponding sampling date

PCB CONGENER

CONCENTRATION,

STREAMBED AND

SUSPENDED SEDIMENT,

IN MICROGRAMS PER

KILOGRAM

Bar graph symbol and

corresponding sampling date

08/29/2006

10/10/2006

RATIO OF INDIVIDUAL

CONGENER 

CONCENTRATION TO ΣPCBC NDND

ND

ND Nondetection at laboratory reporting level

ND Nondetection at laboratory reporting level

All ND

ND

ND

ND

ND

ND

ND

ND

ND

ND

ND

ND

ND

ND

ND

ND
22 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

source of PCBs in Meandering Road Creek. Although current 

(2004–07) transport of PCBs from AFP4 to the creek is occurring, as OF4, OF4 Flume, OF5, and SSO sample analyses 

indicate, the decrease in PCB concentrations over time in the 

lake-bottom sediment samples collected in the 2003 gravity cores (WWD.1, WWD.2, and WWD.3) are evidence that 

PCB loading to the inlet has decreased since the 1960s. The 

downward trend in PCB concentrations at sites WWD.1 and 

WWD.3 continued between 2003 and 2006 while the trend 

generally changed little at site WWD.2, as demonstrated by 

results of analyses of box core samples collected in 2006 at the 

same sites (fig. 10). 

Sixteen of the 20 box core sites in Woods Inlet had 

lower PCB concentrations in the 2006 cores compared to 

those in the 2003 cores (fig. 11). Of the four sites that 

showed an increase in total PCB concentrations between 

the 2003 and 2006 box cores, three were in the Meandering 

Road Creek arm of Woods Inlet and the fourth was in the 

middle of Woods Inlet. Comparing the 2003 and 2006 

box cores, PCB concentrations did not increase in either 

the Gruggs or the Texas National Guard arms of Woods 

Inlet. 

Figure 10. Total polychlorinated biphenyl (PCB) concentrations (as sum of PCB Aroclors [ΣPCBA] and sum of PCB congeners [ΣPCBC]) 

and estimated deposition date for lake-bottom sediment samples from Woods Inlet of Lake Worth, Fort Worth, Texas, 2003 and 2006. 

Box cores collected in 2006

Gravity cores collected in 2003 

(Besse and others, 2005)

EXPLANATION

Site WWD.1 Site WWD.2 Site WWD.3

0 20 40 60 80 100 0 20 40 60 80 100 0 50 100 150 200 250 300

TOTAL PCB CONCENTRATION, IN MICROGRAMS PER KILOGRAM

1970

1975

1980

1985

1990

1995

2000

2005

2010

1970

1975

1980

1985

1990

1995

2000

2005

2010

ESTIMATED DEPOSITION DATE

ΣPCBA

ΣPCBC ΣPCBC

ΣPCBA

ΣPCBC

ΣPCBA
Degree of Contamination and Sources of Polychlorinated Biphenyls 23 Figure 11. Total polychlorinated biphenyl (PCB) concentrations as the sum of PCB congeners (

ΣPCBC) in lake-bottom sediment samples from Woods Inlet of Lake Worth, Fort 

Worth, Texas, 2003 and 2006. 

ND

2.4

ND

2.5

ND

130

43

6.4

2.2

4.8

27

4.9

7.4

16

12

8.4

4.2 10

33

25

Base modified from U.S. Geological SurveyDigital orthophoto quarter-quadrangle,Universal Transverse Mercator projection, Zone 14,Datum NAD 83, 1-foot resolution 0 0.25 MILE

0 0.25 KILOMETER

0.125

0.125

Lake-bottom sediment sampling site and ΣPCBC concentration, in

micrograms per kilogram

2003 Gravity core (Besse andothers, 2005) or 2006 box core at2003 gravity core site (this report) 0 to 10

10 to 2020 to 30 30 to 40Greater than 40

0 to 1010 to 2020 to 30 

ND Nondetection

Box core 2003 (Besse andothers, 2005); 2006 (this report)

8.06

22.9

4.2

10

10.9

73.8

20.7 36.7

EXPLANATION

4.75

6.54

8.50 9.00

10.0

36.7

73.8

8.09

10.9

8.06

34.0

14.9

15.9

13.2

16.9

14.7

14.7 13.9

22.9

20.7

2003 2006

Gruggs arm

Texas NationalGuard (TNG) arm

Meandering Road Creekarm

Middle ofWoods Inlet

Gruggs arm

Texas NationalGuard (TNG) arm

Meandering Road Creekarm

Middle ofWoods Inlet

97o27'15" 97o27'30"

32o47'

32o46'45"

97o27'15" 97o27'30"
24 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Summary

Lake Worth is a reservoir on the West Fork Trinity River 

on the western edge of Fort Worth, Texas. Air Force Plant 4 

(AFP4) is on the eastern shore of Woods Inlet, an arm of Lake 

Worth that extends south from the main body of the lake. A 

previous USGS report in 2003 documented elevated polychlorinated biphenyl (PCB) concentrations in surficial sediment 

in Woods Inlet relative to those in surficial sediment in other 

parts of Lake Worth. A subsequent USGS report in 2005 

indicated the highest PCB concentrations in Woods Inlet near 

the mouth of Meandering Road Creek. This report presents the 

results of another USGS study, done in cooperation with the 

U.S. Air Force, to indicate the degree of PCB contamination of 

Meandering Road Creek and Woods Inlet and to identify possible sources of PCBs in Meandering Road Creek and Woods 

Inlet on the basis of suspended, streambed, and lake-bottom 

sediment samples collected there in 2004 and 2006–07. 

Concentrations of total PCBs in suspended, streambed, 

and lake-bottom sediment samples were compared to two 

consensus-based sediment quality guidelines to indicate the 

degree of contamination: the threshold effect concentration 

(TEC) and the probable effect concentration (PEC). The TEC 

is the concentration below which adverse effects to benthic 

biota rarely occur, and the PEC is the concentration above 

which adverse effects to benthic biota are expected to occur 

frequently.

Total PCBs were computed in two ways: as the sum of 

three widely used Aroclors (1016/1242, 1254, 1260) (ΣPCBA) 

or as the sum of 27 laboratory reported congeners (ΣPCBC). 

(PCBs are mixtures of a subset of as many as 209 theoretically possible chlorinated compounds, called congeners.) The 

ΣPCBA typically is larger than ΣPCBC. 

The concentrations of ΣPCBA and ΣPCBC in suspended, 

streambed, and lake-bottom sediment samples were compared 

to the TEC for total PCB (59.8 μg/kg). Suspended sediment 

concentrations exceed the TEC for 76 percent of the samples 

when comparing the ΣPCBA to the TEC and for 41 percent of 

the samples when comparing the ΣPCBC to the TEC. The concentration of ΣPCBA for 24 percent of the suspended sediment 

samples is greater than the PEC for total PCBs (676 μg/kg). 

There are fewer streambed and lake-bottom sediment samples 

than suspended sediment samples with total PCB concentrations greater than the TEC and none are greater than the PEC. 

ΣPCBA concentrations in streambed sediment samples exceed 

the TEC for 33 percent of the samples, and ΣPCBC in streambed sediment samples exceed the TEC for 17 percent of the 

samples. ΣPCBA and ΣPCBC concentrations in lake-bottom 

sediment samples exceed the TEC for 18 and 6 percent of the 

samples, respectively.

Potential sources of PCBs include historical landfills or 

historically contaminated soils on AFP4 and point or nonpoint 

sources in the surrounding urban area. Total PCB concentrations in suspended and streambed sediment samples varied 

greatly among sites and indicate likely sources of PCBs associated with sites SSO, OF4, and OF5, which receive runoff 

from AFP4. For UMRC, the site receiving drainage from the 

surrounding urban area but not influenced by runoff from 

AFP4, no PCB congeners were detected in any of the three 

samples (one streambed sediment and two suspended sediment) collected there. 

The sources of PCBs to Meandering Road Creek and 

Woods Inlet were investigated by comparing the relative distributions of PCB congeners of suspended sediment to those 

of streambed and lake-bottom sediment. The sources of PCBs 

were identified using graphical analysis of normalized concentrations (congener ratios) of 11 congeners selected on the basis 

of their detection frequency, range of chlorination, concentrations, and concentration variation between sites. For graphical 

analysis, the sampling sites were divided into three groups 

with each group associated with one of the three outfalls 

sampled: SSO, OF4, and OF5. The variations of normalized 

PCB congener concentrations from Woods Inlet, from outfalls 

along Meandering Road Creek, and from streambed sediment 

sampling sites along Meandering Road Creek generally form 

similar patterns within sample groups, which is indicative of a 

common source of PCBs to each group. The SSO group shows 

a congener ratio pattern dominated by the hexachlorobiphenyl 

congener 138 and to a lesser extent the pentachlorobiphenyl 

congeners 110 and 118. The OF4 group generally shows a 

distinctly different congener ratio pattern compared to the 

SSO group, specifically an increasing degree of chlorination 

in which congeners 170, 180, and 187 are more prominent. 

The congener ratio patterns of the OF5 group do not show 

any trend common to the entire group. However, the congener 

ratio pattern for LMRC, the creek site closest to the Meandering Road Creek arm of Woods Inlet, is almost identical to the 

congener ratio pattern for the Meandering Road Creek arm of 

the inlet. Overall, the variations in congener ratios indicate that 

PCBs in surficial lake-bottom sediment of Woods Inlet probably entered Woods Inlet primarily from Meandering Road 

Creek, and that runoff from AFP4 is a prominent source of 

PCBs in Meandering Road Creek. 

Sixteen of the 20 box core sites in Woods Inlet had lower 

PCB concentrations in the 2006 cores compared to those in the 

2003 cores. Of the four sites that showed an increase in total 

PCB concentrations between the 2003 and 2006 box cores, 

three were in the Meandering Road Creek arm of Woods Inlet.

References

Agency for Toxic Substances and Disease Registry, 2001, 

ToxFAQ for polychlorinated biphenyls (PCBs): accessed 

July 26, 2007, at http://www.atsdr.cdc.gov/tfacts17.pdf 

Besse, R.E., Van Metre, P.C., and Wilson, J.T., 2005, Distribution and sources of polychlorinated biphenyls in Woods 

Inlet, Lake Worth, Fort Worth, Texas, 2003: U.S. Geological 

Survey Scientific Investigations Report 2005–5064, 40 p.
References 25

Cacela, Dave, Beltman, D.J., and Lipton, Joshua, 2002, 

Polychlorinated biphenyl source attribution in Green Bay, 

Wisconsin, USA, using multivariate similarity among 

congener profiles in sediment samples: Environmental 

Toxicology and Chemistry, v. 21, no. 8, p. 1,591–1,599.

Callender, Edward, and Robbins, J.A., 1993, Transport and 

accumulation of radionuclides and stable elements in a 

Missouri River reservoir: Water Resources Research, v. 29, 

no. 6, p. 1,787–1,804.

CH2M Hill, 1984, Installation restoration program records 

search for Air Force Plant 4: Contract report for U.S. Air 

Force [variously paged].

Colman, J.A., 2000, Source identification and fish exposure 

for polychlorinated biphenyls using congener analysis from 

passive water samplers in the Millers River Basin, Massachusetts: U.S. Geological Survey Water-Resources Investigations Report 00–4250, 44 p.

Connor, B.F., Rose, D.L., Noriega, M.C., Murtagh, L.K., and 

Abney, S.R., 1997, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory—Determination of 86 volatile organic compounds in water by gas 

chromatography/mass spectrometry, including detections 

less than reporting limits: U.S. Geological Survey Open-File 

Report 97–829, 78 p.

Earth Tech, Inc., 2005, West side DNAPL and PCB investigation at Air Force Plant 4, Fort Worth, Texas: Prepared for 

U.S. Air Force, Aeronautical Systems Center, Environmental Management Directorate, Wright-Patterson Air Force 

Base, Ohio, Contract No. F41624–00–D–8023 [variously 

paged].

Garcia, C.A., 2005, Subsurface occurrence and potential 

source areas of chlorinated ethenes identified using concentration and concentration ratios, Air Force Plant 4 and Naval 

Air Station-Joint Reserve Base Carswell Field, Fort Worth, 

Texas: U.S. Geological Survey Scientific Investigations 

Report 2005–5176, 81 p.

Harwell, G.R., Van Metre, P.C., Wilson, J.T., and Mahler, B.J., 

2003, Spatial distribution and trends in trace elements, polycyclic aromatic hydrocarbons, organochlorine pesticides, 

and polychlorinated biphenyls in Lake Worth sediment, Fort 

Worth, Texas: U.S. Geological Survey Water-Resources 

Investigations Report 03–4269, 56 p.

International Technology Corporation, 2001, West side site 

investigation report, Air Force Plant 4, Fort Worth, Texas: 

Monroeville, Penn., International Technology Corporation, 

110 p.

Johnson, G.W., Jarman, W.M., Bacon, C.E., Davis, J.A., 

Ehrlich, Robert, and Risebrough, R.W., 2000, Resolving 

polychlorinated biphenyl source fingerprints in suspended 

particulate matter of San Francisco Bay: Environmental 

Science and Technology, v. 34, no. 4, p. 552–559.

Long, E.R., MacDonald, D.D., Smith, S.L., and Calder, F.D., 

1995, Incidence of adverse biological effects within ranges 

of chemical concentrations in marine and estuarine sediments: Environmental Management, v. 19, p. 81–97.

Long, G.R., Ayers, M.A., Callender, Edward, and Van Metre, 

P.C., 2003, Trends in chemical concentration in sediment 

cores from three lakes in New Jersey and one lake on Long 

Island, New York: U.S. Geological Survey Water-Resources 

Investigation Report 02–4272, 23 p.

MacDonald, D.D., Ingersoll, C.G., and Berger, T.A., 2000, 

Development and evaluation of consensus-based sediment 

quality guidelines for freshwater ecosystems: Archives 

of Environmental Contamination and Toxicology, v. 39, 

p. 20–31.

Mahler, B.J., and Van Metre, P.C., 2003, A simplified 

approach for monitoring hydrophobic organic contaminants 

associated with suspended sediments—Methodology and 

applications: Archives of Environmental Contamination and 

Toxicology, v. 44, no. 3, p. 288–297.

Moring, J.B., 2002, Data on occurrence of selected trace metals, organochlorines, and semivolatile organic compounds 

in edible fish tissues from Lake Worth, Fort Worth, Texas, 

1999: U.S. Geological Survey Open-File Report 02–016, 

23 p.

Noriega, M.C., Wydoski, D.S., and Foreman, W.T., 2003, 

Methods of analysis by the U.S. Geological Survey National 

Water Quality Laboratory—Determination of organochlorine pesticides and polychlorinated biphenyls in bottom and 

suspended sediment by gas chromatography with electroncapture detection: U.S. Geological Survey Water-Resources 

Investigations Report 03–4293, 46 p.

Olson, M.C., Iverson, J.L., Furlong, E.T., and Schroeder, M.P., 

2004, Methods of analysis by the U.S. Geological Survey 

National Water Quality Laboratory—Determination of 

polycyclic aromatic hydrocarbon compounds in sediment 

by gas chromatography/mass spectrometry: U.S. Geological Survey Water-Resources Investigations Report 03–4318, 

45 p.

RUST Geotech, 1995, Air Force Plant 4, remedial investigation and preliminary assessment/site inspection report, 

volume 1: Prepared for U.S. Air Force, Headquarters 

Aeronautical Systems Center, Wright-Patterson Air 

Force Base, Ohio, Department of Energy Contract No. 

DE–AC04–861D12584, GJPO–WMP–75, 545 p.

RUST Geotech, 1996, Final Record of Decision, Air Force 

Plant 4, Tarrant County, Texas: Prepared for U.S. Air Force, 

Headquarters Aeronautical Systems Center, Wright-Patterson Air Force Base, Ohio, Department of Energy Contract 

No. DE–AC04–94AL96907, GJPO–TP–11, 182 p.

Shelton, L.R., and Capel, P.D., 1994, Guidelines for collecting 

and processing samples of stream bed sediment for analysis 
26 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

of trace element and organic contaminants for the National 

Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 94–0458, 20 p.

Smith, J.A., Witkowski, P.J., and Fusillo, T.V., 1988, 

Manmade organic compounds in the surface waters of the 

United States—A review of current understanding: U.S. 

Geological Survey Circular 1007, 92 p.

Texas Department of Health, 1998, Public health assessment, 

U.S. Air Force Plant No. 4 (General Dynamics), Fort Worth, 

Tarrant County, Texas: Comprehensive Environmental 

Response, Compensation, and Liability Information System, 

CERCLIS no. TX7572024605, 39 p.

Texas Department of Health, 2004, Fish consumption advisories and bans: accessed March 9, 2004, at http://www.tdh.

state.tx.us/bfds/ssd

U.S. Environmental Protection Agency, 1990, National priorities list—NPL site narrative for Air Force Plant #4 (General 

Dynamics): accessed November 18, 2003, at http://www.

epa.gov/superfund/sites/npl/nar786.htm

Van Metre, P.C., Callender, Edward, and Fuller, C.C., 1997, 

Historical trends in organochlorine compounds in river 

basins identified using sediment cores from reservoirs: 

Environmental Science and Technology, v. 31, no. 8, 

p. 2,339–2,344.

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

Fuller, C.C., 1998, Similar rates of decrease of persistent, 

hydrophobic and particle-reactive contaminants in riverine 

systems: Environmental Science and Technology, v. 32, 

no. 21, p. 3,312–3,317.

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

and Mahler, B.J., 2004, Collection, analysis, and agedating 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.
Appendixes Appendixes 1–5
Blank Page
Appendix 1 29

Appendix 1

Appendix 1. List of sampling sites, locations, dates, types of samples collected, and types of analyses in and near Meandering Road Creek and Woods Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Site ID Latitude Longitude Sample date Sample type

Analysis type

PCB 

congeners

Organochlorine 

pesticides VOCs Inorganics

Water and suspended and streambed sediments

08045355 UMRC 32° 46.003' 97° 27.809' 08/27/2006 Suspended sediment X X

08/29/2006 Streambed sediment X X

10/10/2006 Suspended sediment X X

324614097272501 Site 7 32° 46.242' 97° 27.414' 11/16/2004 Streambed sediment X X

08/29/2006 Streambed sediment X X

324621097271801 Site 6 32° 46.356' 97° 27.304' 11/16/2004 Streambed sediment X X

08/29/2006 Streambed sediment X X

324626097271701 Site 5 32° 46.441' 97° 27.277' 11/16/2004 Streambed sediment X X

08/29/2006 Streambed sediment X X

324628097271601 Site 8 32° 46.443' 97° 27.266' 11/16/2004 Streambed sediment X X

08/29/2006 Streambed sediment X X

324629097271601 Site 4 32° 46.456' 97° 27.274' 11/16/2004 Streambed sediment X X

08/29/2006 Streambed sediment X X

324627097271601 SSO 32° 46.450' 97° 27.267' 11/16/2004 Suspended sediment and water X X X

12/06/2004 Suspended sediment and water X X X

324634097271501 Site 3 32° 46.584' 97° 27.243' 11/16/2004 Streambed sediment X X

08/29/2006 Streambed sediment X X

324635097271401 Site 2 32° 46.588' 97° 27.236' 11/16/2004 Streambed sediment X X

08/29/2006 Streambed sediment X X

324636097271401 Site 1 32° 46.596' 97° 27.241' 11/16/2004 Streambed sediment X X

08/29/2006 Streambed sediment X X

324632097270901 OF4 Flume 32° 46.533' 97° 27.150' 11/16/2004 Suspended sediment and water X X X

12/06/2004 Suspended sediment and water X X X

08/27/2006 Suspended sediment X X

08045359 OF4 32° 46.572' 97° 27.215' 10/22/2004 Suspended sediment and water X X X

11/16/2004 Suspended sediment and water X X X

12/06/2004 Suspended sediment and water X X X

08/27/2006 Suspended sediment X X

10/10/2006 Suspended sediment X X

324638097270901 OF5A 32° 46.633' 97° 27.167' 10/22/2004 Suspended sediment and water X X X

OF5B 32° 46.633' 97° 27.150' 10/10/2006 Suspended sediment X X

OF5A 05/24/2007 Suspended sediment X X

08045360 LMRC 32° 46.637' 97° 27.212' 08/27/2006 Suspended sediment X X

08/29/2006 Streambed sediment X X

10/10/2006 Suspended sediment X X

Appendix 1. List of sampling sites, locations, dates, types of samples collected, and types of analyses in and near Meandering Road Creek and Woods Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07.[USGS, U.S. Geological Survey; ID, identifier; PCB, polychlorinated biphenyl; VOCs, volatile organic compounds; °, degree; ', minute; cm, centimeter] 
30 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas Appendix 1. List of sampling sites, locations, dates, types of samples collected, and types of analyses in and near Meandering Road Creek and Woods Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07—Continued. USGS station ID Site ID Latitude Longitude Sample date Sample type Analysis type PCB congeners Organochlorine pesticides VOCs Inorganics Lake-bottom sediments Meandering Road Creek arm 324643097271501 WWD.B6 32° 46.721' 97° 27.255' 08/28/2006 Lake-bottom sediment; box core

X

X

X

324646097271601 WWD.B7 32° 46.772' 97° 27.268' 08/28/2006 Lake-bottom sediment; box core

X

X

X

324649097271601 WWD.3 32° 46.811' 97° 27.267' 08/28/2006 Lake-bottom sediment; box core at 

2003 gravity core location

X

X

324652097271601 WWD.B8 32° 46.859' 97° 27.271' 08/28/2006 Lake-bottom sediment; box core

X

X

X

324654097271601 WWD.B9 32° 46.895' 97° 27.273' 08/28/2006 Lake-bottom sediment; box core

X

X

Texas National Guard arm324647097272101 WWD.B4 32° 46.783' 97° 27.354' 08/28/2006 Lake-bottom sediment; box core

X

X

324649097271901 WWD.B5 32° 46.822' 97° 27.319' 08/28/2006 Lake-bottom sediment; box core

X

X

X

Gruggs arm324658097273301 WWD.B1 32° 46.968' 97° 27.551' 08/28/2006 Lake-bottom sediment; box core

X

X

324658097273001 WWD.B2 32° 46.962' 97° 27.498' 08/28/2006 Lake-bottom sediment; box core

X

X

X

324656097272301 WWD.B3 32° 46.941' 97° 27.377' 08/28/2006 Lake-bottom sediment; box core

X

X

X

324658097272501 WWD.2 32° 46.967' 97° 27.422' 08/28/2006 Lake-bottom sediment; box core at 

2003 gravity core location

X

X

Middle Woods Inlet324657097271901 WWD.1 32° 46.950' 97° 27.309' 08/28/2006 Lake-bottom sediment; box core at 

2003 gravity core location

X

X X (0–1 cm 

only)

324659097271601 WWD.B10 32° 46.980' 97° 27.266' 08/28/2006 Lake-bottom sediment; box core

X

X

324800097271701 WWD.B11 32° 46.999' 97° 27.288' 08/28/2006 Lake-bottom sediment; box core

X

X

324700097271901 WWD.B12 32° 47.006' 97° 27.322' 08/28/2006 Lake-bottom sediment; box core

X

X

Upper Woods Inlet324703097271401 WWD.B13 32° 47.058' 97° 27.240' 08/28/2006 Lake-bottom sediment; box core

X

X

324704097271601 WWD.B14 32° 47.074' 97° 27.273' 08/28/2006 Lake-bottom sediment; box core

X

X

324705097271701 WWD.B15 32° 47.088' 97° 27.282' 08/28/2006 Lake-bottom sediment; box core

X

X

324703097270901 WWD.B16 32° 47.055' 97° 27.156' 08/28/2006 Lake-bottom sediment; box core

X

X

324709097271201 WWD.B17 32° 47.150' 97° 27.201' 08/28/2006 Lake-bottom sediment; box core

X

X
Appendix 2 31

Appendix 2. Appendix 2 Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued. 

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

PCB 

Aroclor 

1016/1242

PCB 

Aroclor 

1254

PCB 

Aroclor 

1260

ΣPCB 

Aroclors

PCB 

8

Suspended and streambed sediments

08045355 UMRC n/a Suspended 08/27/2006 200706709 9.9 <12 <12 <12 <38 <2.5

08045355 UMRC n/a Streambed 08/29/2006 200706709 8.9 <5.0 <5.0 <5.0 <15 <1.0

08045355 UMRC n/a Suspended 10/10/2006 200708606 .97 <130 <130 <130 <390 <26

324614097272501 Site 7 n/a Streambed 11/16/2004 200502001 20.3 <5.0 E2.7 <5.0 E2.7 <1.0

324614097272501 Site 7 n/a Streambed 08/29/2006 200706709 20.5 <5.0 E5.7 E4.4 E10 <1.0

324621097271801 Site 6 n/a Streambed 11/16/2004 200502001 23.5 <5.0 <5.0 <5.0 <15 <1.0

324621097271801 Site 6 n/a Streambed 08/29/2006 200706709 20.5 <5.0 E3.9 E5.6 E9.5 <1.0

324626097271701 Site 5 n/a Streambed 11/16/2004 200502001 20.2 <5.0 17 8.3 E25 <1.0

324626097271701 Site 5 n/a Streambed 08/29/2006 200706709 22.7 E7.3 E89 32 E130 <1.0

324628097271601 Site 8 n/a Streambed 11/16/2004 200502001 22.1 E4.9 18 12 E35 <1.0

324628097271601 Site 8 n/a Streambed 08/29/2006 200706709 24.7 <5.0 E45 22 E67 <1.0

324628097271601 Site 8 dup n/a Streambed 08/29/2006 200706709 23.6 <5.0 E42 22 E64 <1.0

324629097271601 Site 4 n/a Streambed 11/16/2004 200502001 22.9 13 10 8.2 31 2.2

324629097271601 Site 4 n/a Streambed 08/29/2006 200706709 21.5 <5.0 120 49 E170 <1.0

324627097271601 SSO n/a Suspended 11/16/2004 200502405 1.4 <85 E98 E64 E160 <17

324627097271601 SSO n/a Suspended 12/06/2004 200502405 2.8 <40 E65 E60 E120 <8.0

324634097271501 Site 3 n/a Streambed 11/16/2004 200502001 18.5 <5.0 34 30 E64 <1.0

324634097271501 Site 3 n/a Streambed 08/29/2006 200707203 20.2 <5.0 E11 11 E22 <1.0

324635097271401 Site 2 n/a Streambed 11/16/2004 200502001 25.2 6.4 18 34 58 <1.0

324635097271401 Site 2 n/a Streambed 08/29/2006 200707203 21.0 <5.0 E13 E6.4 E19 <1.0

324636097271401 Site 1 n/a Streambed 11/16/2004 200502001 22.8 <5.0 17 14 E31 <1.0

324636097271401 Site 1 dup n/a Streambed 11/16/2004 200502001 22.8 <5.0 14 12 E26 <1.0

324636097271401 Site 1 n/a Streambed 08/29/2006 200707203 22.2 E4.2 E72 53 E130 <1.0

324636097271401 Site 1 dup n/a Streambed 08/29/2006 200710906 19.8 <5.0 48 46 E94 <1.0

324632097270901 OF4 Flume n/a Suspended 11/16/2004 200502001 1.0 <120 E250 E550 E800 <25

324632097270901 OF4 Flume n/a Suspended 12/06/2004 200502405 1.3 <95 E300 E390 E690 <19

324632097270901 OF4 Flume n/a Suspended 08/27/2006 200706709 .58 E10 E54 E82 E150 <43

08045359 OF4 n/a Suspended 10/22/2004 200502001 15.6 <5.0 16 28 E44 <1.0

08045359 OF4 n/a Suspended 11/16/2004 200502405 1.3 <95 E170 E390 E560 <19

08045359 OF4 n/a Suspended 12/06/2004 200502405 1.7 <70 E320 E360 E680 <14

08045359 OF4 n/a Suspended 08/27/2006 200706709 .69 E7.5 E56 E74 E140 <36

08045359 OF4 n/a Suspended 10/10/2006 200708606 2.4 E21 170 150 E330 <10

324638097270901 OF5 n/a Suspended 10/22/2004 200502001 .54 <220 <220 E240 E240 <45

324638097270901 OF51 n/a Suspended 10/10/2006 200708606 .17 <720 E200 870 E1,100 <140

324638097270901 OF5 n/a Suspended 05/24/2007 200715504 11.7 <10 18 92 E110 <2.0

324638097270901 OF5 dup n/a Suspended 05/24/2007 200715504 11.7 <10 17 130 E147 <2.0

08045360 LMRC n/a Suspended 08/27/2006 200706709 133 <5.0 <5.0 <5.0 <15 <1.0

08045360 LMRC n/a Streambed 08/29/2006 200707203 22.1 E3.8 E53 37 E94 <1.0

08045360 LMRC n/a Suspended 10/10/2006 200708606 5.7 <20 26 52 E78 <4.0

08045360 LMRC dup n/a Suspended 10/10/2006 200708606 9.3 <15 20 40 E60 <3.0

Footnotes at end of table.

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07. 

[In micrograms per kilogram except as noted. USGS, U.S. Geological Survey; ID, identifier; cm; centimeter; S, sum; n/a, not applicable; <, less than; E, estimated; dup, duplicate; - -, not applicable or not available]
32 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued. 

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

PCB 

Aroclor 

1016/1242

PCB 

Aroclor 

1254

PCB 

Aroclor 

1260

ΣPCB 

Aroclors

PCB 

8

Lake bottom sediments

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 08/28/2006 200636101 20.6 E3.8 33 32 E69 <1.0

324646097271601 WWD.B7 0-1 .5 Lake bottom 08/28/2006 200703201 16.6 34 E250 170 E450 E.8

324649097271601 WWD.3 0-1 .5 Lake bottom 08/28/2006 200703606 15.7 <5.0 E31 28 E58 <1.0

324649097271601 WWD.3 1-3 2.0 Lake bottom 08/28/2006 200703606 17.4 E5.9 E44 28 E78 <1.0

324649097271601 WWD.3 3-5 4.0 Lake bottom 08/28/2006 200703606 18.4 <5.0 E45 31 E76 <1.0

324649097271601 WWD.3 5-10 7.5 Lake bottom 08/28/2006 200703606 19.6 7.1 E43 28 E78 <1.0

324649097271601 WWD.3 10-13 11.5 Lake bottom 08/28/2006 200703606 17.4 9.3 E63 38 E110 <1.0

324649097271601 WWD.3 10-13 dup 11.5 Lake bottom 08/28/2006 200703606 17.4 7.7 E49 32 E88 <1.0

324652097271601 WWD.B8 0-1 .5 Lake bottom 08/28/2006 200634208 14.5 E5.6 46 31 E83 <1.0

324654097271601 WWD.B9 0-1 .5 Lake bottom 08/28/2006 200636101 13.5 E3.4 24 24 E52 <1.0

Texas National Guard arm

324647097272101 WWD.B4 0-2 1.0 Lake bottom 08/28/2006 200636101 12.2 <10 12 14 E26 <2.0

324647097272101 WWD.B4 0-2 dup 1.0 Lake bottom 08/28/2006 200636101 12.7 <10 12 13 E25 <2.0

324649097271901 WWD.B5 0-1 .5 Lake bottom 08/28/2006 200703201 22.5 <5.0 E6.3 7.0 E13 <1.0

324649097271901 WWD.B5 0-1 dup .5 Lake bottom 08/28/2006 200703201 22.4 <5.0 E6.8 E4.4 E11 <1.0

Gruggs arm

324658097273301 WWD.B1 0-1.5 .75 Lake bottom 08/28/2006 200703201 16.6 <5.0 E6.9 13 E20 <1.0

324658097273001 WWD.B2 0-1 .5 Lake bottom 08/28/2006 200636101 19.3 <5.0 E6.7 E12 E18 <1.0

324656097272301 WWD.B3 0-1 .5 Lake bottom 08/28/2006 200636101 11.6 <10 10 13 E24 <2.0

324658097272501 WWD.2 0-1 .5 Lake bottom 08/28/2006 200703606 16.1 <5.0 E8.0 13 E21 <1.0

324658097272501 WWD.2 0-1 dup .5 Lake bottom 08/28/2006 200703606 16.2 <5.0 E15 15 E30 <1.0

324658097272501 WWD.2 1-3 2.0 Lake bottom 08/28/2006 200703606 15.3 <5.0 E6.8 11 E18 <1.0

324658097272501 WWD.2 3-5 4.0 Lake bottom 08/28/2006 200703606 16.3 <5.0 E6.3 9.1 E15 <1.0

324658097272501 WWD.2 5-10 7.5 Lake bottom 08/28/2006 200703606 16.0 <5.0 E9.4 12 E21 <1.0

324658097272501 WWD.2 10-15 12.5 Lake bottom 08/28/2006 200703606 15.9 <5.0 E6.7 12 E19 <1.0

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 08/28/2006 200703201 12.1 <10 E18 16 E34 <2.0

324657097271901 WWD.1 1-3 2.0 Lake bottom 08/28/2006 200703201 12.7 <10 E20 17 E38 <2.0

324657097271901 WWD.1 3-5 4.0 Lake bottom 08/28/2006 200703201 14.6 E4.2 E23 19 E46 <1.0

324657097271901 WWD.1 5-10 7.5 Lake bottom 08/28/2006 200703201 13.3 E4.6 E22 19 E46 <2.0

324657097271901 WWD.1 10-15 12.5 Lake bottom 08/28/2006 200703201 13.7 E6.2 E28 21 E56 <2.0

324659097271601 WWD.B10 0-1 .5 Lake bottom 08/28/2006 200703201 12.8 <10 E18 13 E31 <2.0

324800097271701 WWD.B11 0-1 .5 Lake bottom 08/28/2006 200636101 11.1 <10 12 16 E27 <2.0

324700097271901 WWD.B12 0-1 .5 Lake bottom 08/28/2006 200703201 12.6 E5.0 E25 23 E53 <2.0

Upper Woods Inlet

324703097271401 WWD.B13 0-1 .5 Lake bottom 08/28/2006 200634208 10.8 <10 E8.0 E5.9 E14 <2.0

324704097271601 WWD.B14 0-2 1.0 Lake bottom 08/28/2006 200636101 12.0 <10 12 9.8 E22 <2.0

324705097271701 WWD.B15 0-2 1.0 Lake bottom 08/28/2006 200636101 21.7 <5.0 <5.0 <5.0 <15 <1.0

324703097270901 WWD.B16 0-1 .5 Lake bottom 08/28/2006 200636101 11.2 <10 E9.9 10 E20 <2.0

324709097271201 WWD.B17 0-2 1.0 Lake bottom 08/28/2006 200703201 10.7 <10 E7.5 E6.5 E14 <2.0

Sediment quality guidelines

Threshold effect concentration (TEC)2 - - - - - - - - - - - - - - - - 59.8 - -

Probable effect concentration (PEC)2 - - - - - - - - - - - - - - - - 676.0 - -

Footnotes at end of table.
Appendix 2 33

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

PCB 

18

PCB 

22

PCB 

26

PCB 

28

PCB 

31

PCB 

33

PCB 

44

Suspended and streambed sediments

08045355 UMRC n/a Suspended 08/27/2006 200706709 9.9 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5

08045355 UMRC n/a Streambed 08/29/2006 200706709 8.9 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

08045355 UMRC n/a Suspended 10/10/2006 200708606 .97 <26 <26 <26 <26 <26 <26 <26

324614097272501 Site 7 n/a Streambed 11/16/2004 200502001 20.3 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324614097272501 Site 7 n/a Streambed 08/29/2006 200706709 20.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324621097271801 Site 6 n/a Streambed 11/16/2004 200502001 23.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324621097271801 Site 6 n/a Streambed 08/29/2006 200706709 20.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324626097271701 Site 5 n/a Streambed 11/16/2004 200502001 20.2 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324626097271701 Site 5 n/a Streambed 08/29/2006 200706709 22.7 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 1.3

324628097271601 Site 8 n/a Streambed 11/16/2004 200502001 22.1 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 E.6

324628097271601 Site 8 n/a Streambed 08/29/2006 200706709 24.7 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324628097271601 Site 8 dup n/a Streambed 08/29/2006 200706709 23.6 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324629097271601 Site 4 n/a Streambed 11/16/2004 200502001 22.9 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324629097271601 Site 4 n/a Streambed 08/29/2006 200706709 21.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 1.2

324627097271601 SSO n/a Suspended 11/16/2004 200502405 1.4 <17 <17 <17 <17 <17 <17 <17

324627097271601 SSO n/a Suspended 12/06/2004 200502405 2.8 <8.0 <8.0 <8.0 <8.0 <8.0 <8.0 <8.0

324634097271501 Site 3 n/a Streambed 11/16/2004 200502001 18.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324634097271501 Site 3 n/a Streambed 08/29/2006 200707203 20.2 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324635097271401 Site 2 n/a Streambed 11/16/2004 200502001 25.2 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324635097271401 Site 2 n/a Streambed 08/29/2006 200707203 21.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324636097271401 Site 1 n/a Streambed 11/16/2004 200502001 22.8 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324636097271401 Site 1 dup n/a Streambed 11/16/2004 200502001 22.8 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324636097271401 Site 1 n/a Streambed 08/29/2006 200707203 22.2 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324636097271401 Site 1 dup n/a Streambed 08/29/2006 200710906 19.8 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324632097270901 OF4 Flume n/a Suspended 11/16/2004 200502001 1.0 <25 <25 <25 <25 <25 <25 <25

324632097270901 OF4 Flume n/a Suspended 12/06/2004 200502405 1.3 <19 <19 <19 <19 <19 <19 <19

324632097270901 OF4 Flume n/a Suspended 08/27/2006 200706709 .58 <43 <43 <43 <43 <43 <43 <43

08045359 OF4 n/a Suspended 10/22/2004 200502001 15.6 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

08045359 OF4 n/a Suspended 11/16/2004 200502405 1.3 <19 <19 <19 <19 <19 <19 <19

08045359 OF4 n/a Suspended 12/06/2004 200502405 1.7 <14 <14 <14 <14 <14 <14 <14

08045359 OF4 n/a Suspended 08/27/2006 200706709 .69 <36 <36 <36 <36 <36 <36 <36

08045359 OF4 n/a Suspended 10/10/2006 200708606 2.4 <10 <10 <10 <10 <10 <10 E2.7

324638097270901 OF5 n/a Suspended 10/22/2004 200502001 .54 <45 <45 <45 <45 <45 <45 <45

324638097270901 OF51 n/a Suspended 10/10/2006 200708606 .17 <140 <140 <140 <140 <140 <140 <140

324638097270901 OF5 n/a Suspended 05/24/2007 200715504 11.7 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324638097270901 OF5 dup n/a Suspended 05/24/2007 200715504 11.7 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

08045360 LMRC n/a Suspended 08/27/2006 200706709 133 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

08045360 LMRC n/a Streambed 08/29/2006 200707203 22.1 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

08045360 LMRC n/a Suspended 10/10/2006 200708606 5.7 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0

08045360 LMRC dup n/a Suspended 10/10/2006 200708606 9.3 <3.0 <3.0 <3.0 <3.0 <3.0 <3.0 <3.0

Footnotes at end of table.
34 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

PCB 

18

PCB 

22

PCB 

26

PCB 

28

PCB 

31

PCB 

33

PCB 

44

Lake bottom sediments

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 08/28/2006 200636101 20.6 <1.0 <1.0 <1.0 <1.0 E0.5 <1.0 E.7

324646097271601 WWD.B7 0-1 .5 Lake bottom 08/28/2006 200703201 16.6 E1.0 E.6 <1.0 1.9 1.5 E.8 2.9

324649097271601 WWD.3 0-1 .5 Lake bottom 08/28/2006 200703606 15.7 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324649097271601 WWD.3 1-3 2.0 Lake bottom 08/28/2006 200703606 17.4 <1.0 <1.0 <1.0 E.6 <1.0 <1.0 E.9

324649097271601 WWD.3 3-5 4.0 Lake bottom 08/28/2006 200703606 18.4 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 E.9

324649097271601 WWD.3 5-10 7.5 Lake bottom 08/28/2006 200703606 19.6 <1.0 <1.0 <1.0 <1.0 E.5 <1.0 E.7

324649097271601 WWD.3 10-13 11.5 Lake bottom 08/28/2006 200703606 17.4 <1.0 <1.0 <1.0 E.9 E.6 <1.0 1.2

324649097271601 WWD.3 10-13 dup 11.5 Lake bottom 08/28/2006 200703606 17.4 <1.0 <1.0 <1.0 E.6 <1.0 <1.0 E.9

324652097271601 WWD.B8 0-1 .5 Lake bottom 08/28/2006 200634208 14.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324654097271601 WWD.B9 0-1 .5 Lake bottom 08/28/2006 200636101 13.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 E.6

Texas National Guard arm

324647097272101 WWD.B4 0-2 1.0 Lake bottom 08/28/2006 200636101 12.2 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324647097272101 WWD.B4 0-2 dup 1.0 Lake bottom 08/28/2006 200636101 12.7 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324649097271901 WWD.B5 0-1 .5 Lake bottom 08/28/2006 200703201 22.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324649097271901 WWD.B5 0-1 dup .5 Lake bottom 08/28/2006 200703201 22.4 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

Gruggs arm

324658097273301 WWD.B1 0-1.5 .75 Lake bottom 08/28/2006 200703201 16.6 1.4 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324658097273001 WWD.B2 0-1 .5 Lake bottom 08/28/2006 200636101 19.3 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324656097272301 WWD.B3 0-1 .5 Lake bottom 08/28/2006 200636101 11.6 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324658097272501 WWD.2 0-1 .5 Lake bottom 08/28/2006 200703606 16.1 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324658097272501 WWD.2 0-1 dup .5 Lake bottom 08/28/2006 200703606 16.2 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324658097272501 WWD.2 1-3 2.0 Lake bottom 08/28/2006 200703606 15.3 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324658097272501 WWD.2 3-5 4.0 Lake bottom 08/28/2006 200703606 16.3 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324658097272501 WWD.2 5-10 7.5 Lake bottom 08/28/2006 200703606 16.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324658097272501 WWD.2 10-15 12.5 Lake bottom 08/28/2006 200703606 15.9 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 08/28/2006 200703201 12.1 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324657097271901 WWD.1 1-3 2.0 Lake bottom 08/28/2006 200703201 12.7 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324657097271901 WWD.1 3-5 4.0 Lake bottom 08/28/2006 200703201 14.6 E.9 <1.0 E.8 <1.0 <1.0 <1.0 <1.0

324657097271901 WWD.1 5-10 7.5 Lake bottom 08/28/2006 200703201 13.3 E1.1 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324657097271901 WWD.1 10-15 12.5 Lake bottom 08/28/2006 200703201 13.7 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324659097271601 WWD.B10 0-1 .5 Lake bottom 08/28/2006 200703201 12.8 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324800097271701 WWD.B11 0-1 .5 Lake bottom 08/28/2006 200636101 11.1 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324700097271901 WWD.B12 0-1 .5 Lake bottom 08/28/2006 200703201 12.6 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

Upper Woods Inlet

324703097271401 WWD.B13 0-1 .5 Lake bottom 08/28/2006 200634208 10.8 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324704097271601 WWD.B14 0-2 1.0 Lake bottom 08/28/2006 200636101 12.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324705097271701 WWD.B15 0-2 1.0 Lake bottom 08/28/2006 200636101 21.7 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324703097270901 WWD.B16 0-1 .5 Lake bottom 08/28/2006 200636101 11.2 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324709097271201 WWD.B17 0-2 1.0 Lake bottom 08/28/2006 200703201 10.7 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

Sediment quality guidelines

Threshold effect concentration (TEC)2 - - - - - - - - - - - - - - - - - - - - - - - -

Probable effect concentration (PEC)2 - - - - - - - - - - - - - - - - - - - - - - - -

Footnotes at end of table.
Appendix 2 35

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

PCB 

49

PCB 

52

PCB 

70

PCB 

95

PCB 

101

PCB 

110

PCB 

118

Suspended and streambed sediments

08045355 UMRC n/a Suspended 08/27/2006 200706709 9.9 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5

08045355 UMRC n/a Streambed 08/29/2006 200706709 8.9 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

08045355 UMRC n/a Suspended 10/10/2006 200708606 .97 <26 <26 <26 <26 <26 <26 <26

324614097272501 Site 7 n/a Streambed 11/16/2004 200502001 20.3 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324614097272501 Site 7 n/a Streambed 08/29/2006 200706709 20.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324621097271801 Site 6 n/a Streambed 11/16/2004 200502001 23.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324621097271801 Site 6 n/a Streambed 08/29/2006 200706709 20.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324626097271701 Site 5 n/a Streambed 11/16/2004 200502001 20.2 <1.0 E.6 <1.0 1.0 1.3 2.3 1.7

324626097271701 Site 5 n/a Streambed 08/29/2006 200706709 22.7 1.1 3.2 2.3 5.7 8.3 14 7.2

324628097271601 Site 8 n/a Streambed 11/16/2004 200502001 22.1 <1.0 1.2 <1.0 1.6 1.5 2.7 1.4

324628097271601 Site 8 n/a Streambed 08/29/2006 200706709 24.7 <1.0 1.3 <1.0 2.6 4.0 8.1 3.3

324628097271601 Site 8 dup n/a Streambed 08/29/2006 200706709 23.6 <1.0 1.2 <1.0 2.5 3.8 5.8 3.1

324629097271601 Site 4 n/a Streambed 11/16/2004 200502001 22.9 <1.0 E.5 <1.0 E.7 1.0 1.5 E.7

324629097271601 Site 4 n/a Streambed 08/29/2006 200706709 21.5 <1.0 3.4 2.0 6.3 10 19 11

324627097271601 SSO n/a Suspended 11/16/2004 200502405 1.4 <17 <17 <17 <17 <17 E9.6 E8.5

324627097271601 SSO n/a Suspended 12/06/2004 200502405 2.8 <8.0 <8.0 <8.0 <8.0 E4.6 E6.9 E6.2

324634097271501 Site 3 n/a Streambed 11/16/2004 200502001 18.5 <1.0 1.3 <1.0 2.6 4.0 5.4 3.2

324634097271501 Site 3 n/a Streambed 08/29/2006 200707203 20.2 <1.0 <1.0 <1.0 <1.0 E.7 1.3 E.8

324635097271401 Site 2 n/a Streambed 11/16/2004 200502001 25.2 <1.0 E.6 <1.0 1.6 1.4 2.9 1.3

324635097271401 Site 2 n/a Streambed 08/29/2006 200707203 21.0 <1.0 <1.0 <1.0 E.6 1.0 1.7 1.1

324636097271401 Site 1 n/a Streambed 11/16/2004 200502001 22.8 <1.0 <1.0 <1.0 1.2 1.6 2.9 1.6

324636097271401 Site 1 dup n/a Streambed 11/16/2004 200502001 22.8 <1.0 <1.0 <1.0 1.0 1.3 2.2 1.3

324636097271401 Site 1 n/a Streambed 08/29/2006 200707203 22.2 <1.0 1.2 E.6 3.4 5.0 9.8 4.3

324636097271401 Site 1 dup n/a Streambed 08/29/2006 200710906 19.8 <1.0 E1.0 <1.0 2.3 3.7 7.2 3.2

324632097270901 OF4 Flume n/a Suspended 11/16/2004 200502001 1.0 <25 <25 <25 E13 E17 E31 E33

324632097270901 OF4 Flume n/a Suspended 12/06/2004 200502405 1.3 <19 <19 E9.4 E18 E22 E33 E31

324632097270901 OF4 Flume n/a Suspended 08/27/2006 200706709 .58 <43 <43 <43 <43 <43 E3.8 E2.0

08045359 OF4 n/a Suspended 10/22/2004 200502001 15.6 <1.0 <1.0 <1.0 E.7 E.8 1.9 1.0

08045359 OF4 n/a Suspended 11/16/2004 200502405 1.3 <19 <19 <19 <19 E12 E19 E19

08045359 OF4 n/a Suspended 12/06/2004 200502405 1.7 <14 E8.2 E10 E20 E26 E37 E32

08045359 OF4 n/a Suspended 08/27/2006 200706709 .69 <36 <36 <36 <36 <36 E4.5 E3.4

08045359 OF4 n/a Suspended 10/10/2006 200708606 2.4 <10 E3.0 E6.8 E9.0 E8.7 20 14

324638097270901 OF5 n/a Suspended 10/22/2004 200502001 .54 <45 <45 <45 <45 <45 <45 <45

324638097270901 OF51 n/a Suspended 10/10/2006 200708606 .17 <140 <140 <140 <140 <140 <140 <140

324638097270901 OF5 n/a Suspended 05/24/2007 200715504 11.7 <2.0 <2.0 <2.0 E1.1 E1.2 2.2 2.1

324638097270901 OF5 dup n/a Suspended 05/24/2007 200715504 11.7 <2.0 <2.0 <2.0 E1.1 E1.4 2.5 2.4

08045360 LMRC n/a Suspended 08/27/2006 200706709 133 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

08045360 LMRC n/a Streambed 08/29/2006 200707203 22.1 <1.0 1.2 E.6 2.7 4.2 7.2 4.3

08045360 LMRC n/a Suspended 10/10/2006 200708606 5.7 <4.0 <4.0 <4.0 <4.0 E1.9 E2.9 E1.9

08045360 LMRC dup n/a Suspended 10/10/2006 200708606 9.3 <3.0 <3.0 <3.0 E1.1 E1.7 E2.4 E1.5

Footnotes at end of table.
36 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

PCB 

49

PCB 

52

PCB 

70

PCB 

95

PCB 

101

PCB 

110

PCB 

118

Lake bottom sediments

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 08/28/2006 200636101 20.6 <1.0 1.2 1.1 3.3 3.7 4.7 3.1

324646097271601 WWD.B7 0-1 .5 Lake bottom 08/28/2006 200703201 16.6 2.7 4.9 3.9 10 12 15 9.9

324649097271601 WWD.3 0-1 .5 Lake bottom 08/28/2006 200703606 15.7 <1.0 E.9 E.6 2.1 2.3 3.7 2.3

324649097271601 WWD.3 1-3 2.0 Lake bottom 08/28/2006 200703606 17.4 E.8 1.4 1.2 3.0 3.7 4.9 3.5

324649097271601 WWD.3 3-5 4.0 Lake bottom 08/28/2006 200703606 18.4 E.9 1.5 1.2 3.3 4.1 5.4 3.3

324649097271601 WWD.3 5-10 7.5 Lake bottom 08/28/2006 200703606 19.6 E.8 1.5 1.2 3.2 3.7 5.0 3.1

324649097271601 WWD.3 10-13 11.5 Lake bottom 08/28/2006 200703606 17.4 1.4 2.3 1.5 4.7 6.1 7.4 5.1

324649097271601 WWD.3 10-13 dup 11.5 Lake bottom 08/28/2006 200703606 17.4 1.1 1.8 1.4 3.6 4.6 5.8 3.8

324652097271601 WWD.B8 0-1 .5 Lake bottom 08/28/2006 200634208 14.5 <1.0 1.2 <1.0 2.7 <1.0 5.1 3.4

324654097271601 WWD.B9 0-1 .5 Lake bottom 08/28/2006 200636101 13.5 <1.0 E.9 <1.0 2.5 2.5 3.3 2.0

Texas National Guard arm

324647097272101 WWD.B4 0-2 1.0 Lake bottom 08/28/2006 200636101 12.2 <2.0 <2.0 <2.0 E1.3 <2.0 E1.3 <2.0

324647097272101 WWD.B4 0-2 dup 1.0 Lake bottom 08/28/2006 200636101 12.7 <2.0 <2.0 <2.0 E1.1 <2.0 E1.3 <2.0

324649097271901 WWD.B5 0-1 .5 Lake bottom 08/28/2006 200703201 22.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324649097271901 WWD.B5 0-1 dup .5 Lake bottom 08/28/2006 200703201 22.4 <1.0 <1.0 <1.0 <1.0 <1.0 E.6 <1.0

Gruggs arm

324658097273301 WWD.B1 0-1.5 .75 Lake bottom 08/28/2006 200703201 16.6 <1.0 <1.0 <1.0 <1.0 <1.0 E.5 <1.0

324658097273001 WWD.B2 0-1 .5 Lake bottom 08/28/2006 200636101 19.3 <1.0 <1.0 <1.0 E.5 <1.0 <1.0 <1.0

324656097272301 WWD.B3 0-1 .5 Lake bottom 08/28/2006 200636101 11.6 <2.0 <2.0 <2.0 <2.0 <2.0 E1.1 <2.0

324658097272501 WWD.2 0-1 .5 Lake bottom 08/28/2006 200703606 16.1 <1.0 <1.0 <1.0 <1.0 E.6 E.8 E.5

324658097272501 WWD.2 0-1 dup .5 Lake bottom 08/28/2006 200703606 16.2 <1.0 <1.0 <1.0 <1.0 E1.0 E1.4 E1.5

324658097272501 WWD.2 1-3 2.0 Lake bottom 08/28/2006 200703606 15.3 <1.0 <1.0 <1.0 <1.0 <1.0 E.7 <1.0

324658097272501 WWD.2 3-5 4.0 Lake bottom 08/28/2006 200703606 16.3 <1.0 <1.0 <1.0 <1.0 <1.0 E.6 <1.0

324658097272501 WWD.2 5-10 7.5 Lake bottom 08/28/2006 200703606 16.0 <1.0 <1.0 <1.0 E.8 E.7 E1.0 <1.0

324658097272501 WWD.2 10-15 12.5 Lake bottom 08/28/2006 200703606 15.9 <1.0 <1.0 <1.0 E.6 E.4 E.7 <1.0

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 08/28/2006 200703201 12.1 <2.0 <2.0 <2.0 E1.1 E1.3 E1.7 E1.1

324657097271901 WWD.1 1-3 2.0 Lake bottom 08/28/2006 200703201 12.7 <2.0 <2.0 <2.0 E1.3 E1.5 E1.9 E1.3

324657097271901 WWD.1 3-5 4.0 Lake bottom 08/28/2006 200703201 14.6 <1.0 E.7 <1.0 1.5 1.7 2.2 1.4

324657097271901 WWD.1 5-10 7.5 Lake bottom 08/28/2006 200703201 13.3 <2.0 <2.0 <2.0 E1.5 E1.7 2.2 E1.4

324657097271901 WWD.1 10-15 12.5 Lake bottom 08/28/2006 200703201 13.7 <2.0 E.9 <2.0 E2.0 2.2 2.7 E1.7

324659097271601 WWD.B10 0-1 .5 Lake bottom 08/28/2006 200703201 12.8 <2.0 <2.0 <2.0 E1.1 E1.2 E1.7 E1.0

324800097271701 WWD.B11 0-1 .5 Lake bottom 08/28/2006 200636101 11.1 <2.0 <2.0 <2.0 2.0 E1.6 E2.0 E1.3

324700097271901 WWD.B12 0-1 .5 Lake bottom 08/28/2006 200703201 12.6 <2.0 <2.0 <2.0 E1.7 E1.9 2.5 E1.6

Upper Woods Inlet

324703097271401 WWD.B13 0-1 .5 Lake bottom 08/28/2006 200634208 10.8 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324704097271601 WWD.B14 0-2 1.0 Lake bottom 08/28/2006 200636101 12.0 <2.0 <2.0 <2.0 <2.0 <2.0 E1.0 <2.0

324705097271701 WWD.B15 0-2 1.0 Lake bottom 08/28/2006 200636101 21.7 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324703097270901 WWD.B16 0-1 .5 Lake bottom 08/28/2006 200636101 11.2 <2.0 <2.0 <2.0 E1.1 <2.0 <2.0 <2.0

324709097271201 WWD.B17 0-2 1.0 Lake bottom 08/28/2006 200703201 10.7 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

Sediment quality guidelines

Threshold effect concentration (TEC)2 - - - - - - - - - - - - - - - - - - - - - - - -

Probable effect concentration (PEC)2 - - - - - - - - - - - - - - - - - - - - - - - -

Footnotes at end of table.
Appendix 2 37

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

PCB 

138

PCB 

146

PCB 

149

PCB 

151

PCB 

170

PCB 

174

PCB 

177

PCB 

180

Suspended and streambed sediments

08045355 UMRC n/a Suspended 08/27/2006 200706709 9.9 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5

08045355 UMRC n/a Streambed 08/29/2006 200706709 8.9 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

08045355 UMRC n/a Suspended 10/10/2006 200708606 .97 <26 <26 <26 <26 <26 <26 <26 <26

324614097272501 Site 7 n/a Streambed 11/16/2004 200502001 20.3 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324614097272501 Site 7 n/a Streambed 08/29/2006 200706709 20.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324621097271801 Site 6 n/a Streambed 11/16/2004 200502001 23.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324621097271801 Site 6 n/a Streambed 08/29/2006 200706709 20.5 E.8 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324626097271701 Site 5 n/a Streambed 11/16/2004 200502001 20.2 2.2 <1.0 1.2 <1.0 <1.0 <1.0 <1.0 E.7

324626097271701 Site 5 n/a Streambed 08/29/2006 200706709 22.7 15 1.5 6.3 1.4 1.6 1.4 <1.0 3.2

324628097271601 Site 8 n/a Streambed 11/16/2004 200502001 22.1 3.2 <1.0 1.8 <1.0 E.6 <1.0 <1.0 1.1

324628097271601 Site 8 n/a Streambed 08/29/2006 200706709 24.7 9.3 <1.0 3.8 <1.0 1.1 <1.0 <1.0 2.4

324628097271601 Site 8 dup n/a Streambed 08/29/2006 200706709 23.6 7.0 <1.0 3.7 <1.0 1.1 <1.0 <1.0 2.2

324629097271601 Site 4 n/a Streambed 11/16/2004 200502001 22.9 1.8 <1.0 E.8 <1.0 <1.0 <1.0 <1.0 E.6

324629097271601 Site 4 n/a Streambed 08/29/2006 200706709 21.5 27 2.4 10.0 2.3 3.3 2.4 1.4 5.7

324627097271601 SSO n/a Suspended 11/16/2004 200502405 1.4 E14 <17 <17 <17 <17 <17 <17 <17

324627097271601 SSO n/a Suspended 12/06/2004 200502405 2.8 E10 <8.0 E4.4 <8.0 <8.0 <8.0 <8.0 E4.5

324634097271501 Site 3 n/a Streambed 11/16/2004 200502001 18.5 7.4 1.1 4.4 1.3 1.6 1.1 E.9 2.7

324634097271501 Site 3 n/a Streambed 08/29/2006 200707203 20.2 2.9 <1.0 E1.0 <1.0 E.6 <1.0 <1.0 1.1

324635097271401 Site 2 n/a Streambed 11/16/2004 200502001 25.2 5.0 E.8 3.0 1.0 2.1 1.6 1.0 3.6

324635097271401 Site 2 n/a Streambed 08/29/2006 200707203 21.0 2.7 <1.0 1.1 <1.0 <1.0 <1.0 <1.0 E.8

324636097271401 Site 1 n/a Streambed 11/16/2004 200502001 22.8 3.7 <1.0 2.1 <1.0 E.8 <1.0 <1.0 1.2

324636097271401 Site 1 dup n/a Streambed 11/16/2004 200502001 22.8 2.8 <1.0 1.7 <1.0 E.5 <1.0 <1.0 E.9

324636097271401 Site 1 n/a Streambed 08/29/2006 200707203 22.2 E18 2.2 8.3 2.1 4.0 2.8 1.7 7.5

324636097271401 Site 1 dup n/a Streambed 08/29/2006 200710906 19.8 15 1.6 6.2 1.6 2.7 2.2 1.4 5.6

324632097270901 OF4 Flume n/a Suspended 11/16/2004 200502001 1.0 E64 <25 E34 <25 E41 E22 E17 E68

324632097270901 OF4 Flume n/a Suspended 12/06/2004 200502405 1.3 E52 <19 E26 <19 E21 E12 <19 E37

324632097270901 OF4 Flume n/a Suspended 08/27/2006 200706709 .58 E8.2 <43 E1.1 <43 1.9 <43 <43 5.0

08045359 OF4 n/a Suspended 10/22/2004 200502001 15.6 3.6 <1.0 1.0 <1.0 2.0 1.0 E.6 2.9

08045359 OF4 n/a Suspended 11/16/2004 200502405 1.3 E40 <19 E19 <19 E24 E13 <19 E41

08045359 OF4 n/a Suspended 12/06/2004 200502405 1.7 E53 <14 E26 <14 E20 E11 E8.8 E33

08045359 OF4 n/a Suspended 08/27/2006 200706709 .69 E9.4 <36 E2.9 <36 <36 <36 <36 E4.8

08045359 OF4 n/a Suspended 10/10/2006 200708606 2.4 33 E3.9 15 E3.3 E7.5 E5.3 E3.5 15

324638097270901 OF5 n/a Suspended 10/22/2004 200502001 .54 <45 <45 <45 <45 <45 <45 <45 E29

324638097270901 OF51 n/a Suspended 10/10/2006 200708606 .17 E43 <140 <140 <140 E49 E31 <140 E94

324638097270901 OF5 n/a Suspended 05/24/2007 200715504 11.7 8.2 <2.0 5.5 2.1 9.0 8.4 5.9 23

324638097270901 OF5 dup n/a Suspended 05/24/2007 200715504 11.7 8.7 <2.0 5.7 2.2 9.3 8.7 6.1 21

08045360 LMRC n/a Suspended 08/27/2006 200706709 133 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

08045360 LMRC n/a Streambed 08/29/2006 200707203 22.1 E12 1.4 5.4 1.4 2.9 2.0 1.2 5.5

08045360 LMRC n/a Suspended 10/10/2006 200708606 5.7 6.4 <4.0 4.1 <4.0 E2.3 E2.1 <4.0 4.7

08045360 LMRC dup n/a Suspended 10/10/2006 200708606 9.3 4.9 <3.0 3.1 <3.0 E1.8 E1.6 <3.0 3.7

Footnotes at end of table.
38 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

PCB 

138

PCB 

146

PCB 

149

PCB 

151

PCB 

170

PCB 

174

PCB 

177

PCB 

180

Lake bottom sediments

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 08/28/2006 200636101 20.6 7.9 E1.0 3.9 1.3 1.7 1.2 E.8 3.3

324646097271601 WWD.B7 0-1 .5 Lake bottom 08/28/2006 200703201 16.6 19 2.6 12 3.0 4.4 3.7 2.3 9.1

324649097271601 WWD.3 0-1 .5 Lake bottom 08/28/2006 200703606 15.7 5.0 E.7 2.4 E.8 <1.0 1.1 E.7 <1.0

324649097271601 WWD.3 1-3 2.0 Lake bottom 08/28/2006 200703606 17.4 6.3 E.8 3.5 E.9 1.4 1.2 E.7 2.8

324649097271601 WWD.3 3-5 4.0 Lake bottom 08/28/2006 200703606 18.4 7.0 E.7 4.0 1.0 1.5 1.2 E.8 2.9

324649097271601 WWD.3 5-10 7.5 Lake bottom 08/28/2006 200703606 19.6 6.1 E.6 <1.0 E.9 1.4 1.2 E.7 E2.8

324649097271601 WWD.3 10-13 11.5 Lake bottom 08/28/2006 200703606 17.4 8.1 1.2 4.8 1.2 2.0 1.5 E1.0 3.8

324649097271601 WWD.3 10-13 dup 11.5 Lake bottom 08/28/2006 200703606 17.4 7.5 E1.0 4.5 1.2 1.6 1.4 E.8 3.1

324652097271601 WWD.B8 0-1 .5 Lake bottom 08/28/2006 200634208 14.5 7.6 <1.0 3.7 1.1 2.0 1.3 <1.0 3.6

324654097271601 WWD.B9 0-1 .5 Lake bottom 08/28/2006 200636101 13.5 4.4 E.6 2.4 E.6 1.3 E.8 E.6 2.4

Texas National Guard arm

324647097272101 WWD.B4 0-2 1.0 Lake bottom 08/28/2006 200636101 12.2 E1.3 <2.0 E1.2 <2.0 <2.0 <2.0 <2.0 E1.3

324647097272101 WWD.B4 0-2 dup 1.0 Lake bottom 08/28/2006 200636101 12.7 E1.0 <2.0 E1.2 <2.0 <2.0 <2.0 <2.0 E1.4

324649097271901 WWD.B5 0-1 .5 Lake bottom 08/28/2006 200703201 22.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 E.5

324649097271901 WWD.B5 0-1 dup .5 Lake bottom 08/28/2006 200703201 22.4 E.7 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

Gruggs arm

324658097273301 WWD.B1 0-1.5 .75 Lake bottom 08/28/2006 200703201 16.6 1.4 <1.0 1.0 <1.0 E.6 E.5 <1.0 1.3

324658097273001 WWD.B2 0-1 .5 Lake bottom 08/28/2006 200636101 19.3 E1.2 <1.0 E.6 <1.0 <1.0 <1.0 <1.0 E1.2

324656097272301 WWD.B3 0-1 .5 Lake bottom 08/28/2006 200636101 11.6 E1.5 <2.0 E1.1 <2.0 <2.0 <2.0 <2.0 E1.2

324658097272501 WWD.2 0-1 .5 Lake bottom 08/28/2006 200703606 16.1 1.3 <1.0 E.9 <1.0 <1.0 <1.0 <1.0 <1.0

324658097272501 WWD.2 0-1 dup .5 Lake bottom 08/28/2006 200703606 16.2 2.5 <1.0 E1.3 <1.0 <1.0 <1.0 <1.0 <1.0

324658097272501 WWD.2 1-3 2.0 Lake bottom 08/28/2006 200703606 15.3 1.2 <1.0 E.8 <1.0 <1.0 <1.0 <1.0 <1.0

324658097272501 WWD.2 3-5 4.0 Lake bottom 08/28/2006 200703606 16.3 1.0 <1.0 E.7 <1.0 <1.0 <1.0 <1.0 <1.0

324658097272501 WWD.2 5-10 7.5 Lake bottom 08/28/2006 200703606 16.0 1.5 <1.0 1.1 <1.0 <1.0 <1.0 <1.0 <1.0

324658097272501 WWD.2 10-15 12.5 Lake bottom 08/28/2006 200703606 15.9 1.2 <1.0 E.7 <1.0 <1.0 <1.0 <1.0 <1.0

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 08/28/2006 200703201 12.1 2.2 <2.0 E1.5 <2.0 <2.0 <2.0 <2.0 E1.4

324657097271901 WWD.1 1-3 2.0 Lake bottom 08/28/2006 200703201 12.7 2.5 <2.0 E1.6 <2.0 <2.0 <2.0 <2.0 E1.4

324657097271901 WWD.1 3-5 4.0 Lake bottom 08/28/2006 200703201 14.6 2.8 <1.0 1.8 <1.0 E.7 E.6 <1.0 1.6

324657097271901 WWD.1 5-10 7.5 Lake bottom 08/28/2006 200703201 13.3 2.7 <2.0 E1.8 <2.0 <2.0 <2.0 <2.0 E1.5

324657097271901 WWD.1 10-15 12.5 Lake bottom 08/28/2006 200703201 13.7 3.2 <2.0 2.1 <2.0 <2.0 <2.0 <2.0 E1.7

324659097271601 WWD.B10 0-1 .5 Lake bottom 08/28/2006 200703201 12.8 2.1 <2.0 E1.3 <2.0 <2.0 <2.0 <2.0 <2.0

324800097271701 WWD.B11 0-1 .5 Lake bottom 08/28/2006 200636101 11.1 2.6 <2.0 E1.5 <2.0 <2.0 <2.0 <2.0 E1.4

324700097271901 WWD.B12 0-1 .5 Lake bottom 08/28/2006 200703201 12.6 3.1 <2.0 2.1 <2.0 <2.0 <2.0 <2.0 E1.9

Upper Woods Inlet

324703097271401 WWD.B13 0-1 .5 Lake bottom 08/28/2006 200634208 10.8 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324704097271601 WWD.B14 0-2 1.0 Lake bottom 08/28/2006 200636101 12.0 E1.5 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324705097271701 WWD.B15 0-2 1.0 Lake bottom 08/28/2006 200636101 21.7 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0

324703097270901 WWD.B16 0-1 .5 Lake bottom 08/28/2006 200636101 11.2 E1.3 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

324709097271201 WWD.B17 0-2 1.0 Lake bottom 08/28/2006 200703201 10.7 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0

Sediment quality guidelines

Threshold effect concentration (TEC)2 - - - - - - - - - - - - - - - - - - - - - - - - - -

Probable effect concentration (PEC)2 - - - - - - - - - - - - - - - - - - - - - - - - - -

Footnotes at end of table.
Appendix 2 39

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth

 (cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

PCB 

183

PCB 

187

PCB 

194

PCB 

206

ΣPCB 

congeners

Organic 

carbon 

(percent)

Suspended and streambed sediments

08045355 UMRC n/a Suspended 08/27/2006 200706709 9.9 <2.5 <2.5 <2.5 <2.5 <68 - -

08045355 UMRC n/a Streambed 08/29/2006 200706709 8.9 <1.0 <1.0 <1.0 <1.0 <27 0.65

08045355 UMRC n/a Suspended 10/10/2006 200708606 .97 <26 <26 <26 <26 <700 - -

324614097272501 Site 7 n/a Streambed 11/16/2004 200502001 20.3 <1.0 <1.0 <1.0 <1.0 <27 - -

324614097272501 Site 7 n/a Streambed 08/29/2006 200706709 20.5 <1.0 <1.0 <1.0 <1.0 <27 1.54

324621097271801 Site 6 n/a Streambed 11/16/2004 200502001 23.5 <1.0 <1.0 <1.0 <1.0 <27 - -

324621097271801 Site 6 n/a Streambed 08/29/2006 200706709 20.5 <1.0 <1.0 <1.0 <1.0 E.8 1.52

324626097271701 Site 5 n/a Streambed 11/16/2004 200502001 20.2 <1.0 <1.0 <1.0 <1.0 E11 - -

324626097271701 Site 5 n/a Streambed 08/29/2006 200706709 22.7 <1.0 1.9 <1.0 <1.0 E75 1.17

324628097271601 Site 8 n/a Streambed 11/16/2004 200502001 22.1 <1.0 E.6 <1.0 <1.0 E16 - -

324628097271601 Site 8 n/a Streambed 08/29/2006 200706709 24.7 <1.0 1.3 <1.0 <1.0 E37 .77

324628097271601 Site 8 dup n/a Streambed 08/29/2006 200706709 23.6 <1.0 1.2 <1.0 <1.0 E32 - -

324629097271601 Site 4 n/a Streambed 11/16/2004 200502001 22.9 <1.0 <1.0 <1.0 <1.0 E9.8 - -

324629097271601 Site 4 n/a Streambed 08/29/2006 200706709 21.5 1.4 2.8 <1.0 <1.0 E110 .77

324627097271601 SSO n/a Suspended 11/16/2004 200502405 1.4 <17 <17 <17 <17 E32 - -

324627097271601 SSO n/a Suspended 12/06/2004 200502405 2.8 <8.0 <8.0 <8.0 <8.0 E37 - -

324634097271501 Site 3 n/a Streambed 11/16/2004 200502001 18.5 E.8 1.5 E.8 <1.0 E40 - -

324634097271501 Site 3 n/a Streambed 08/29/2006 200707203 20.2 <1.0 E.5 <1.0 <1.0 E8.8 .68

324635097271401 Site 2 n/a Streambed 11/16/2004 200502001 25.2 1.2 2.1 1.3 E.7 E31 - -

324635097271401 Site 2 n/a Streambed 08/29/2006 200707203 21.0 <1.0 <1.0 <1.0 <1.0 E9.1 .98

324636097271401 Site 1 n/a Streambed 11/16/2004 200502001 22.8 <1.0 E.7 <1.0 <1.0 E16 - -

324636097271401 Site 1 dup n/a Streambed 11/16/2004 200502001 22.8 <1.0 <1.0 <1.0 <1.0 E12 - -

324636097271401 Site 1 n/a Streambed 08/29/2006 200707203 22.2 2.1 3.6 1.6 E.9 E79 .78

324636097271401 Site 1 dup n/a Streambed 08/29/2006 200710906 19.8 1.2 2.9 1.4 E.8 E60 .78

324632097270901 OF4 Flume n/a Suspended 11/16/2004 200502001 1.0 E14 E33 E22 <25 E410 - -

324632097270901 OF4 Flume n/a Suspended 12/06/2004 200502405 1.3 <19 E17 E13 <19 E290 - -

324632097270901 OF4 Flume n/a Suspended 08/27/2006 200706709 .58 <43 <43 <43 <43 E22 - -

08045359 OF4 n/a Suspended 10/22/2004 200502001 15.6 <1.0 1.6 1.0 <1.0 E18 - -

08045359 OF4 n/a Suspended 11/16/2004 200502405 1.3 <19 E20 E14 <19 E220 - -

08045359 OF4 n/a Suspended 12/06/2004 200502405 1.7 <14 E16 E9.7 <14 E310 - -

08045359 OF4 n/a Suspended 08/27/2006 200706709 .69 <36 <36 <36 <36 E25 - -

08045359 OF4 n/a Suspended 10/10/2006 200708606 2.4 <10 E7.6 E3.7 E2.9 E160 - -

324638097270901 OF5 n/a Suspended 10/22/2004 200502001 .54 <45 <45 <45 <45 E29 - -

324638097270901 OF51 n/a Suspended 10/10/2006 200708606 .17 <140 E33 E51 E27 E330 - -

324638097270901 OF5 n/a Suspended 05/24/2007 200715504 11.7 4.1 8.4 7.9 4.2 E93 - -

324638097270901 OF5 dup n/a Suspended 05/24/2007 200715504 11.7 4.3 8.7 7.9 4.2 E94 - -

08045360 LMRC n/a Suspended 08/27/2006 200706709 133 <1.0 <1.0 <1.0 <1.0 <27 - -

08045360 LMRC n/a Streambed 08/29/2006 200707203 22.1 1.3 2.5 1.2 E.5 E57 .73

08045360 LMRC n/a Suspended 10/10/2006 200708606 5.7 <4.0 E2.8 <4.0 <4.0 E29 - -

08045360 LMRC dup n/a Suspended 10/10/2006 200708606 9.3 <3.0 E2.0 <3.0 <3.0 E24 - -

Footnotes at end of table.
40 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth

 (cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

PCB 

183

PCB 

187

PCB 

194

PCB 

206

ΣPCB 

congeners

Organic 

carbon 

(percent)

Lake bottom sediments

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 08/28/2006 200636101 20.6 E1.0 1.3 E0.8 E0.6 E43 1.49

324646097271601 WWD.B7 0-1 .5 Lake bottom 08/28/2006 200703201 16.6 2.5 4.4 1.9 E.9 E130 1.94

324649097271601 WWD.3 0-1 .5 Lake bottom 08/28/2006 200703606 15.7 E.7 1.4 E.7 <1.0 E25 1.49

324649097271601 WWD.3 1-3 2.0 Lake bottom 08/28/2006 200703606 17.4 E.8 1.4 E.7 <1.0 E41 1.49

324649097271601 WWD.3 3-5 4.0 Lake bottom 08/28/2006 200703606 18.4 E.8 1.7 E.8 1.7 E44 1.51

324649097271601 WWD.3 5-10 7.5 Lake bottom 08/28/2006 200703606 19.6 E.5 1.5 E.6 <1.0 E36 1.67

324649097271601 WWD.3 10-13 11.5 Lake bottom 08/28/2006 200703606 17.4 E.8 2.1 E.7 <1.0 E58 1.59

324649097271601 WWD.3 10-13 dup 11.5 Lake bottom 08/28/2006 200703606 17.4 E.8 1.8 E.7 <1.0 E48 1.87

324652097271601 WWD.B8 0-1 .5 Lake bottom 08/28/2006 200634208 14.5 <1.0 1.6 <1.0 <1.0 E33 1.61

324654097271601 WWD.B9 0-1 .5 Lake bottom 08/28/2006 200636101 13.5 E.6 1.0 E.5 <1.0 E27 1.79

Texas National Guard arm

324647097272101 WWD.B4 0-2 1.0 Lake bottom 08/28/2006 200636101 12.2 <2.0 <2.0 <2.0 <2.0 E6.4 2.47

324647097272101 WWD.B4 0-2 dup 1.0 Lake bottom 08/28/2006 200636101 12.7 <2.0 <2.0 <2.0 <2.0 E6.0 2.74

324649097271901 WWD.B5 0-1 .5 Lake bottom 08/28/2006 200703201 22.5 <1.0 <1.0 1.6 <1.0 E2.2 .76

324649097271901 WWD.B5 0-1 dup .5 Lake bottom 08/28/2006 200703201 22.4 <1.0 <1.0 <1.0 <1.0 E1.3 - -

Gruggs arm

324658097273301 WWD.B1 0-1.5 .75 Lake bottom 08/28/2006 200703201 16.6 <1.0 E.6 <1.0 <1.0 E7.4 1.55

324658097273001 WWD.B2 0-1 .5 Lake bottom 08/28/2006 200636101 19.3 <1.0 E.5 <1.0 E.8 E4.9 1.18

324656097272301 WWD.B3 0-1 .5 Lake bottom 08/28/2006 200636101 11.6 <2.0 <2.0 <2.0 <2.0 E4.8 2.48

324658097272501 WWD.2 0-1 .5 Lake bottom 08/28/2006 200703606 16.1 <1.0 <1.0 <1.0 <1.0 E4.2 1.69

324658097272501 WWD.2 0-1 dup .5 Lake bottom 08/28/2006 200703606 16.2 <1.0 <1.0 <1.0 <1.0 E7.7 - -

324658097272501 WWD.2 1-3 2.0 Lake bottom 08/28/2006 200703606 15.3 <1.0 <1.0 <1.0 <1.0 E2.7 1.47

324658097272501 WWD.2 3-5 4.0 Lake bottom 08/28/2006 200703606 16.3 <1.0 <1.0 <1.0 <1.0 E2.4 1.48

324658097272501 WWD.2 5-10 7.5 Lake bottom 08/28/2006 200703606 16.0 <1.0 E.6 <1.0 <1.0 E5.7 1.38

324658097272501 WWD.2 10-15 12.5 Lake bottom 08/28/2006 200703606 15.9 <1.0 E.6 <1.0 <1.0 E4.2 1.34

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 08/28/2006 200703201 12.1 <2.0 <2.0 <2.0 <2.0 E10 2.31

324657097271901 WWD.1 1-3 2.0 Lake bottom 08/28/2006 200703201 12.7 <2.0 <2.0 <2.0 <2.0 E12 2.09

324657097271901 WWD.1 3-5 4.0 Lake bottom 08/28/2006 200703201 14.6 <1.0 E.8 <1.0 <1.0 E17 2.04

324657097271901 WWD.1 5-10 7.5 Lake bottom 08/28/2006 200703201 13.3 <2.0 <2.0 <2.0 <2.0 E14 1.84

324657097271901 WWD.1 10-15 12.5 Lake bottom 08/28/2006 200703201 13.7 <2.0 E.9 <2.0 <2.0 E18 1.98

324659097271601 WWD.B10 0-1 .5 Lake bottom 08/28/2006 200703201 12.8 <2.0 <2.0 <2.0 <2.0 E8.4 2.29

324800097271701 WWD.B11 0-1 .5 Lake bottom 08/28/2006 200636101 11.1 <2.0 <2.0 <2.0 <2.0 E12 2.16

324700097271901 WWD.B12 0-1 .5 Lake bottom 08/28/2006 200703201 12.6 <2.0 E1.0 <2.0 <2.0 E16 1.93

Upper Woods Inlet

324703097271401 WWD.B13 0-1 .5 Lake bottom 08/28/2006 200634208 10.8 <2.0 <2.0 <2.0 <2.0 <54 2.46

324704097271601 WWD.B14 0-2 1.0 Lake bottom 08/28/2006 200636101 12.0 <2.0 <2.0 <2.0 <2.0 E2.5 2.41

324705097271701 WWD.B15 0-2 1.0 Lake bottom 08/28/2006 200636101 21.7 <1.0 <1.0 <1.0 <1.0 <27 .95

324703097270901 WWD.B16 0-1 .5 Lake bottom 08/28/2006 200636101 11.2 <2.0 <2.0 <2.0 <2.0 E2.4 2.43

324709097271201 WWD.B17 0-2 1.0 Lake bottom 08/28/2006 200703201 10.7 <2.0 <2.0 <2.0 <2.0 <54 2.72

Sediment quality guidelines

Threshold effect concentration (TEC)2 - - - - - - - - - - - - - - - - - - 59.8 - -

Probable effect concentration (PEC)2 - - - - - - - - - - - - - - - - - - 676.0 - -

Footnotes at end of table.
Appendix 2 41

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

betaHCHalphaHCH Aldrin Lindane p,p’-

DDD

p,p’-

DDE

p,p’-

DDT

Suspended and streambed sediments

08045355 UMRC n/a Suspended 08/27/2006 200706709 9.9 <1.2 <3.8 <5.0 <1.2 <6.2 <3.8 <2.5

08045355 UMRC n/a Streambed 08/29/2006 200706709 8.9 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

08045355 UMRC n/a Suspended 10/10/2006 200708606 .97 <13 <39 <52 <13 <65 <39 <26

324614097272501 Site 7 n/a Streambed 11/16/2004 200502001 20.3 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324614097272501 Site 7 n/a Streambed 08/29/2006 200706709 20.5 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324621097271801 Site 6 n/a Streambed 11/16/2004 200502001 23.5 <.5 <1.5 <2.0 <.5 <2.5 E1.2 <1.0

324621097271801 Site 6 n/a Streambed 08/29/2006 200706709 20.5 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324626097271701 Site 5 n/a Streambed 11/16/2004 200502001 20.2 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324626097271701 Site 5 n/a Streambed 08/29/2006 200706709 22.7 <.5 <1.5 <2.0 <.5 <2.5 1.5 <1.0

324628097271601 Site 8 n/a Streambed 11/16/2004 200502001 22.1 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324628097271601 Site 8 n/a Streambed 08/29/2006 200706709 24.7 <.5 <1.5 <2.0 <.5 <2.5 E.8 <1.0

324628097271601 Site 8 dup n/a Streambed 08/29/2006 200706709 23.6 <.5 <1.5 <2.0 <.5 <2.5 E.7 <1.0

324629097271601 Site 4 n/a Streambed 11/16/2004 200502001 22.9 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324629097271601 Site 4 n/a Streambed 08/29/2006 200706709 21.5 <.5 <1.5 <2.0 <.5 <2.5 2.0 <1.0

324627097271601 SSO n/a Suspended 11/16/2004 200502405 1.4 <9.0 <26 <34 <9.0 <43 <26 <17

324627097271601 SSO n/a Suspended 12/06/2004 200502405 2.8 <11 <12 <16 <4.0 <20 <12 <8.0

324634097271501 Site 3 n/a Streambed 11/16/2004 200502001 18.5 <.5 <1.5 <2.0 <.5 <2.5 E.7 1.8

324634097271501 Site 3 n/a Streambed 08/29/2006 200707203 20.2 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324635097271401 Site 2 n/a Streambed 11/16/2004 200502001 25.2 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324635097271401 Site 2 n/a Streambed 08/29/2006 200707203 21.0 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324636097271401 Site 1 n/a Streambed 11/16/2004 200502001 22.8 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324636097271401 Site 1 dup n/a Streambed 11/16/2004 200502001 22.8 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324636097271401 Site 1 n/a Streambed 08/29/2006 200707203 22.2 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324636097271401 Site 1 dup n/a Streambed 08/29/2006 200710906 19.8 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324632097270901 OF4 Flume n/a Suspended 11/16/2004 200502001 1.0 <12 <38 <50 <12 <62 E21 <25

324632097270901 OF4 Flume n/a Suspended 12/06/2004 200502405 1.3 <10 <29 <38 <10 <48 <29 <19

324632097270901 OF4 Flume n/a Suspended 08/27/2006 200706709 .58 <22 <64 <86 <22 <110 <64 <43

08045359 OF4 n/a Suspended 10/22/2004 200502001 15.6 <.5 <1.5 <2.0 <.5 <2.5 E1.2 <1.0

08045359 OF4 n/a Suspended 11/16/2004 200502405 1.3 <10 <29 <38 <10 <48 <29 <19

08045359 OF4 n/a Suspended 12/06/2004 200502405 1.7 <7.0 <21 <28 <7.0 <35 <21 <14

08045359 OF4 n/a Suspended 08/27/2006 200706709 .69 <18 <54 <72 <18 <90 <54 <36

08045359 OF4 n/a Suspended 10/10/2006 200708606 2.4 <5.0 <15 <20 <5.0 <25 <15 <10

324638097270901 OF5 n/a Suspended 10/22/2004 200502001 .54 <22 <68 <90 <22 <110 <68 <45

324638097270901 OF51 n/a Suspended 10/10/2006 200708606 .17 <72 <220 <290 <72 <360 <220 <140

324638097270901 OF5 n/a Suspended 05/24/2007 200715504 11.7 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <3.5

324638097270901 OF5 dup n/a Suspended 05/24/2007 200715504 11.7 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <3.5

08045360 LMRC n/a Suspended 08/27/2006 200706709 133 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

08045360 LMRC n/a Streambed 08/29/2006 200707203 22.1 <.5 <1.5 <2.0 <.5 <2.5 E1.3 1.5

08045360 LMRC n/a Suspended 10/10/2006 200708606 5.7 <2.0 <6.0 <8.0 <2.0 <10 <6.0 <4.0

08045360 LMRC dup n/a Suspended 10/10/2006 200708606 9.3 <1.5 <4.5 <6.0 <1.5 <7.5 <4.5 <3.0

Footnotes at end of table.
42 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

betaHCHalphaHCH Aldrin Lindane p,p’-

DDD

p,p’-

DDE

p,p’-

DDT

Lake bottom sediments

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 08/28/2006 200636101 20.6 <0.5 <1.5 <2.0 <0.5 <2.5 <1.5 <1.0

324646097271601 WWD.B7 0-1 .5 Lake bottom 08/28/2006 200703201 16.6 <.5 <1.5 <2.0 <.5 E2.1 1.8 <1.0

324649097271601 WWD.3 0-1 .5 Lake bottom 08/28/2006 200703606 15.7 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324649097271601 WWD.3 1-3 2.0 Lake bottom 08/28/2006 200703606 17.4 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324649097271601 WWD.3 3-5 4.0 Lake bottom 08/28/2006 200703606 18.4 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324649097271601 WWD.3 5-10 7.5 Lake bottom 08/28/2006 200703606 19.6 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324649097271601 WWD.3 10-13 11.5 Lake bottom 08/28/2006 200703606 17.4 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324649097271601 WWD.3 10-13 dup 11.5 Lake bottom 08/28/2006 200703606 17.4 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324652097271601 WWD.B8 0-1 .5 Lake bottom 08/28/2006 200634208 14.5 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324654097271601 WWD.B9 0-1 .5 Lake bottom 08/28/2006 200636101 13.5 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

Texas National Guard arm

324647097272101 WWD.B4 0-2 1.0 Lake bottom 08/28/2006 200636101 12.2 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

324647097272101 WWD.B4 0-2 dup 1.0 Lake bottom 08/28/2006 200636101 12.7 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

324649097271901 WWD.B5 0-1 .5 Lake bottom 08/28/2006 200703201 22.5 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324649097271901 WWD.B5 0-1 dup .5 Lake bottom 08/28/2006 200703201 22.4 <.5 <1.5 <2.0 <.5 <2.5 E1.1 <1.0

Gruggs arm

324658097273301 WWD.B1 0-1.5 .75 Lake bottom 08/28/2006 200703201 16.6 <.5 <1.5 <2.0 <.5 <2.5 E1.1 <1.0

324658097273001 WWD.B2 0-1 .5 Lake bottom 08/28/2006 200636101 19.3 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324656097272301 WWD.B3 0-1 .5 Lake bottom 08/28/2006 200636101 11.6 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

324658097272501 WWD.2 0-1 .5 Lake bottom 08/28/2006 200703606 16.1 <.5 <1.5 <2.0 <.5 <2.5 E.8 <1.0

324658097272501 WWD.2 0-1 dup .5 Lake bottom 08/28/2006 200703606 16.2 <.5 <1.5 <2.0 <.5 <2.5 E.9 <1.0

324658097272501 WWD.2 1-3 2.0 Lake bottom 08/28/2006 200703606 15.3 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324658097272501 WWD.2 3-5 4.0 Lake bottom 08/28/2006 200703606 16.3 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324658097272501 WWD.2 5-10 7.5 Lake bottom 08/28/2006 200703606 16.0 <.5 <1.5 <2.0 <.5 <2.5 E.9 <1.0

324658097272501 WWD.2 10-15 12.5 Lake bottom 08/28/2006 200703606 15.9 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 08/28/2006 200703201 12.1 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

324657097271901 WWD.1 1-3 2.0 Lake bottom 08/28/2006 200703201 12.7 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

324657097271901 WWD.1 3-5 4.0 Lake bottom 08/28/2006 200703201 14.6 E.3 <1.5 <2.0 <.5 <2.5 E.9 <1.0

324657097271901 WWD.1 5-10 7.5 Lake bottom 08/28/2006 200703201 13.3 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

324657097271901 WWD.1 10-15 12.5 Lake bottom 08/28/2006 200703201 13.7 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

324659097271601 WWD.B10 0-1 .5 Lake bottom 08/28/2006 200703201 12.8 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

324800097271701 WWD.B11 0-1 .5 Lake bottom 08/28/2006 200636101 11.1 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

324700097271901 WWD.B12 0-1 .5 Lake bottom 08/28/2006 200703201 12.6 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

Upper Woods Inlet

324703097271401 WWD.B13 0-1 .5 Lake bottom 08/28/2006 200634208 10.8 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

324704097271601 WWD.B14 0-2 1.0 Lake bottom 08/28/2006 200636101 12.0 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

324705097271701 WWD.B15 0-2 1.0 Lake bottom 08/28/2006 200636101 21.7 <.5 <1.5 <2.0 <.5 <2.5 <1.5 <1.0

324703097270901 WWD.B16 0-1 .5 Lake bottom 08/28/2006 200636101 11.2 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

324709097271201 WWD.B17 0-2 1.0 Lake bottom 08/28/2006 200703201 10.7 <1.0 <3.0 <4.0 <1.0 <5.0 <3.0 <2.0

Sediment quality guidelines

Threshold effect concentration (TEC)2 - - - - - - - - - - - - - - - - 2.37 4.88 3.16 4.16

Probable effect concentration (PEC)2 - - - - - - - - - - - - - - - - 4.99 28.0 31.3 62.9

Footnotes at end of table.
Appendix 2 43

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

Dieldrin

alphaEndosulfan

Endrin Toxaphene

Heptachlor

Heptachlor 

epoxide

Suspended and streambed sediments

08045355 UMRC n/a Suspended 08/27/2006 200706709 9.9 <1.2 <1.2 <2.5 <500 <2.5 <3.8

08045355 UMRC n/a Streambed 08/29/2006 200706709 8.9 E.3 <.5 <1.0 <200 <1.0 <1.5

08045355 UMRC n/a Suspended 10/10/2006 200708606 .97 <13 <13 <26 <5,200 <26 <39

324614097272501 Site 7 n/a Streambed 11/16/2004 200502001 20.3 <.5 <.5 <1.0 <200 <1.0 <1.5

324614097272501 Site 7 n/a Streambed 08/29/2006 200706709 20.5 .7 <.5 <1.0 <200 <1.0 <1.5

324621097271801 Site 6 n/a Streambed 11/16/2004 200502001 23.5 <.5 <.5 <1.0 <200 <1.0 <1.5

324621097271801 Site 6 n/a Streambed 08/29/2006 200706709 20.5 1.7 <.5 <1.0 <200 <1.0 <1.5

324626097271701 Site 5 n/a Streambed 11/16/2004 200502001 20.2 <.5 <.5 <1.0 <200 <1.0 <1.5

324626097271701 Site 5 n/a Streambed 08/29/2006 200706709 22.7 <.5 <.5 <1.0 <200 <1.0 <1.5

324628097271601 Site 8 n/a Streambed 11/16/2004 200502001 22.1 <.5 <.5 <1.0 <200 <1.0 <1.5

324628097271601 Site 8 n/a Streambed 08/29/2006 200706709 24.7 <.5 <.5 <1.0 <200 <1.0 <1.5

324628097271601 Site 8 dup n/a Streambed 08/29/2006 200706709 23.6 <.5 <.5 <1.0 <200 <1.0 <1.5

324629097271601 Site 4 n/a Streambed 11/16/2004 200502001 22.9 <.5 <.5 <1.0 <200 <1.0 <1.5

324629097271601 Site 4 n/a Streambed 08/29/2006 200706709 21.5 .8 <.5 <1.0 <200 <1.0 <1.5

324627097271601 SSO n/a Suspended 11/16/2004 200502405 1.4 <9.0 <9.0 <17 <3,400 <17 <26

324627097271601 SSO n/a Suspended 12/06/2004 200502405 2.8 <4.0 <4.0 <8.0 <1,600 <8.0 <12

324634097271501 Site 3 n/a Streambed 11/16/2004 200502001 18.5 1.1 <.5 <1.0 <200 <1.0 <1.5

324634097271501 Site 3 n/a Streambed 08/29/2006 200707203 20.2 <.5 <.5 <1.0 <200 <1.0 <1.5

324635097271401 Site 2 n/a Streambed 11/16/2004 200502001 25.2 .6 <.5 <1.0 <200 <1.0 <1.5

324635097271401 Site 2 n/a Streambed 08/29/2006 200707203 21.0 <.5 <.5 <1.0 <200 <1.0 <1.5

324636097271401 Site 1 n/a Streambed 11/16/2004 200502001 22.8 <.5 <.5 <1.0 <200 <1.0 <1.5

324636097271401 Site 1 dup n/a Streambed 11/16/2004 200502001 22.8 <.5 <.5 <1.0 <200 <1.0 <1.5

324636097271401 Site 1 n/a Streambed 08/29/2006 200707203 22.2 E.4 <.5 <1.0 <200 <1.0 <1.5

324636097271401 Site 1 dup n/a Streambed 08/29/2006 200710906 19.8 E.4 <.5 <1.0 <200 <1.0 <1.5

324632097270901 OF4 Flume n/a Suspended 11/16/2004 200502001 1.0 <12 <12 <25 <5,000 <25 <38

324632097270901 OF4 Flume n/a Suspended 12/06/2004 200502405 1.3 <10 <10 <19 <3,800 <19 <29

324632097270901 OF4 Flume n/a Suspended 08/27/2006 200706709 .58 <22 <22 <43 <8,600 <43 <64

08045359 OF4 n/a Suspended 10/22/2004 200502001 15.6 .9 <.5 <1.0 <200 <1.0 <1.5

08045359 OF4 n/a Suspended 11/16/2004 200502405 1.3 <10 <10 <19 <3,800 <19 <29

08045359 OF4 n/a Suspended 12/06/2004 200502405 1.7 <7.0 <7.0 <14 <2,800 <14 <21

08045359 OF4 n/a Suspended 08/27/2006 200706709 .69 <18 <18 <36 E7,200 <36 <54

08045359 OF4 n/a Suspended 10/10/2006 200708606 2.4 <5.0 <5.0 <10 <2,000 <10 <15

324638097270901 OF5 n/a Suspended 10/22/2004 200502001 .54 <22 <22 <45 <9,000 <45 <68

324638097270901 OF51 n/a Suspended 10/10/2006 200708606 .17 <72 <72 <140 <29,000 <140 <220

324638097270901 OF5 n/a Suspended 05/24/2007 200715504 11.7 E.7 <1.0 <2.0 <400 <2.0 <3.0

324638097270901 OF5 dup n/a Suspended 05/24/2007 200715504 11.7 E.7 <1.0 <2.0 <400 <2.0 <3.0

08045360 LMRC n/a Suspended 08/27/2006 200706709 133 <.5 <.5 <1.0 <200 <1.0 <1.5

08045360 LMRC n/a Streambed 08/29/2006 200707203 22.1 E.4 <.5 <1.0 <200 <1.0 <1.5

08045360 LMRC n/a Suspended 10/10/2006 200708606 5.7 <2.0 <2.0 <4.0 <400 <4.0 <6.0

08045360 LMRC dup n/a Suspended 10/10/2006 200708606 9.3 <1.5 <1.5 <3.0 <600 <3.0 <4.5

Footnotes at end of table.
44 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

Dieldrin

alphaEndosulfan

Endrin Toxaphene

Heptachlor

Heptachlor 

epoxide

Lake bottom sediments

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 08/28/2006 200636101 20.6 E0.4 <0.5 <1.0 <200 <1.0 <1.5

324646097271601 WWD.B7 0-1 .5 Lake bottom 08/28/2006 200703201 16.6 1.2 <.5 <1.0 <200 <1.0 <1.5

324649097271601 WWD.3 0-1 .5 Lake bottom 08/28/2006 200703606 15.7 <.5 <.5 <1.0 <200 <1.0 <1.5

324649097271601 WWD.3 1-3 2.0 Lake bottom 08/28/2006 200703606 17.4 <.5 <.5 <1.0 <200 <1.0 <1.5

324649097271601 WWD.3 3-5 4.0 Lake bottom 08/28/2006 200703606 18.4 <.5 <.5 <1.0 <200 <1.0 <1.5

324649097271601 WWD.3 5-10 7.5 Lake bottom 08/28/2006 200703606 19.6 <.5 <.5 <1.0 <200 <1.0 <1.5

324649097271601 WWD.3 10-13 11.5 Lake bottom 08/28/2006 200703606 17.4 <.5 <.5 <1.0 <200 <1.0 <1.5

324649097271601 WWD.3 10-13 dup 11.5 Lake bottom 08/28/2006 200703606 17.4 <.5 <.5 <1.0 <200 <1.0 <1.5

324652097271601 WWD.B8 0-1 .5 Lake bottom 08/28/2006 200634208 14.5 <.5 <.5 <1.0 <200 <1.0 <1.5

324654097271601 WWD.B9 0-1 .5 Lake bottom 08/28/2006 200636101 13.5 <.5 <.5 <1.0 <200 <1.0 <1.5

Texas National Guard arm

324647097272101 WWD.B4 0-2 1.0 Lake bottom 08/28/2006 200636101 12.2 <1.0 <1.0 <2.0 <400 <2.0 <3.0

324647097272101 WWD.B4 0-2 dup 1.0 Lake bottom 08/28/2006 200636101 12.7 <1.0 <1.0 <2.0 <400 <2.0 <3.0

324649097271901 WWD.B5 0-1 .5 Lake bottom 08/28/2006 200703201 22.5 <.5 <.5 <1.0 <200 <1.0 <1.5

324649097271901 WWD.B5 0-1 dup .5 Lake bottom 08/28/2006 200703201 22.4 <.5 <.5 <1.0 <200 <1.0 <1.5

Gruggs arm

324658097273301 WWD.B1 0-1.5 .75 Lake bottom 08/28/2006 200703201 16.6 E.6 <.5 <1.0 <200 <1.0 <1.5

324658097273001 WWD.B2 0-1 .5 Lake bottom 08/28/2006 200636101 19.3 <.5 <.5 <1.0 <200 <1.0 <1.5

324656097272301 WWD.B3 0-1 .5 Lake bottom 08/28/2006 200636101 11.6 <1.0 <1.0 <2.0 <400 <2.0 <3.0

324658097272501 WWD.2 0-1 .5 Lake bottom 08/28/2006 200703606 16.1 <.5 <.5 <1.0 <200 <1.0 <1.5

324658097272501 WWD.2 0-1 dup .5 Lake bottom 08/28/2006 200703606 16.2 <.5 <.5 <1.0 <200 <1.0 <1.5

324658097272501 WWD.2 1-3 2.0 Lake bottom 08/28/2006 200703606 15.3 <.5 <.5 <1.0 <200 <1.0 <1.5

324658097272501 WWD.2 3-5 4.0 Lake bottom 08/28/2006 200703606 16.3 <.5 <.5 <1.0 <200 <1.0 <1.5

324658097272501 WWD.2 5-10 7.5 Lake bottom 08/28/2006 200703606 16.0 <.5 <.5 <1.0 <200 <1.0 <1.5

324658097272501 WWD.2 10-15 12.5 Lake bottom 08/28/2006 200703606 15.9 <.5 <.5 <1.0 <200 <1.0 <1.5

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 08/28/2006 200703201 12.1 <1.0 <1.0 <2.0 <400 <2.0 <3.0

324657097271901 WWD.1 1-3 2.0 Lake bottom 08/28/2006 200703201 12.7 <1.0 <1.0 <2.0 <400 <2.0 <3.0

324657097271901 WWD.1 3-5 4.0 Lake bottom 08/28/2006 200703201 14.6 <.5 <.5 <1.0 <200 <1.0 <1.5

324657097271901 WWD.1 5-10 7.5 Lake bottom 08/28/2006 200703201 13.3 <1.0 <1.0 <2.0 <400 <2.0 <3.0

324657097271901 WWD.1 10-15 12.5 Lake bottom 08/28/2006 200703201 13.7 <1.0 <1.0 <2.0 <400 <2.0 <3.0

324659097271601 WWD.B10 0-1 .5 Lake bottom 08/28/2006 200703201 12.8 <1.0 <1.0 <2.0 <400 <2.0 <3.0

324800097271701 WWD.B11 0-1 .5 Lake bottom 08/28/2006 200636101 11.1 <1.0 <1.0 <2.0 <400 <2.0 <3.0

324700097271901 WWD.B12 0-1 .5 Lake bottom 08/28/2006 200703201 12.6 <1.0 <1.0 <2.0 <400 <2.0 <3.0

Upper Woods Inlet

324703097271401 WWD.B13 0-1 .5 Lake bottom 08/28/2006 200634208 10.8 <1.0 <1.0 <2.0 <400 <2.0 <3.0

324704097271601 WWD.B14 0-2 1.0 Lake bottom 08/28/2006 200636101 12.0 <1.0 <1.0 <2.0 <400 <2.0 <3.0

324705097271701 WWD.B15 0-2 1.0 Lake bottom 08/28/2006 200636101 21.7 <.5 <.5 <1.0 <200 <1.0 <1.5

324703097270901 WWD.B16 0-1 .5 Lake bottom 08/28/2006 200636101 11.2 <1.0 <1.0 <2.0 <400 <2.0 <3.0

324709097271201 WWD.B17 0-2 1.0 Lake bottom 08/28/2006 200703201 10.7 <1.0 <1.0 <2.0 <400 <2.0 <3.0

Sediment quality guidelines

Threshold effect concentration (TEC)2 - - - - - - - - - - 1.90 - - 2.22 - - - - 2.47

Probable effect concentration (PEC)2 - - - - - - - - - - 61.8 - - 207 - - - - 16.0

Footnotes at end of table.
Appendix 2 45

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

p,p’-

Methoxychlor

Hexachlorobenzene

Mirex

cisChlordanetransChlordane

Suspended and streambed sediments

08045355 UMRC n/a Suspended 08/27/2006 200706709 9.9 <8.8 <7.5 <3.8 <2.5 <1.2

08045355 UMRC n/a Streambed 08/29/2006 200706709 8.9 <3.5 <3.0 <1.5 <1.0 E.2

08045355 UMRC n/a Suspended 10/10/2006 200708606 .97 <91 <78 <39 <26 <13

324614097272501 Site 7 n/a Streambed 11/16/2004 200502001 20.3 <3.5 <3.0 <1.5 <1.0 .6

324614097272501 Site 7 n/a Streambed 08/29/2006 200706709 20.5 <3.5 <3.0 <1.5 E.8 .8

324621097271801 Site 6 n/a Streambed 11/16/2004 200502001 23.5 <3.5 <3.0 <1.5 <1.0 <.5

324621097271801 Site 6 n/a Streambed 08/29/2006 200706709 20.5 <3.5 <3.0 <1.5 E.6 .6

324626097271701 Site 5 n/a Streambed 11/16/2004 200502001 20.2 <3.5 <3.0 <1.5 <1.0 .5

324626097271701 Site 5 n/a Streambed 08/29/2006 200706709 22.7 <3.5 <3.0 <1.5 E.5 .6

324628097271601 Site 8 n/a Streambed 11/16/2004 200502001 22.1 <3.5 <3.0 <1.5 <1.0 <.5

324628097271601 Site 8 n/a Streambed 08/29/2006 200706709 24.7 <3.5 <3.0 <1.5 <1.0 E.3

324628097271601 Site 8 dup n/a Streambed 08/29/2006 200706709 23.6 <3.5 <3.0 <1.5 <1.0 E.3

324629097271601 Site 4 n/a Streambed 11/16/2004 200502001 22.9 <3.5 <3.0 <1.5 <1.0 <.5

324629097271601 Site 4 n/a Streambed 08/29/2006 200706709 21.5 <3.5 <3.0 <1.5 E.5 .5

324627097271601 SSO n/a Suspended 11/16/2004 200502405 1.4 <60 <51 <26 <17 <9.0

324627097271601 SSO n/a Suspended 12/06/2004 200502405 2.8 <28 <24 <12 <8.0 <4.0

324634097271501 Site 3 n/a Streambed 11/16/2004 200502001 18.5 <3.5 <3.0 <1.5 <1.0 .5

324634097271501 Site 3 n/a Streambed 08/29/2006 200707203 20.2 <3.5 <3.0 <1.5 <1.0 <.5

324635097271401 Site 2 n/a Streambed 11/16/2004 200502001 25.2 <3.5 <3.0 <1.5 <1.0 <.5

324635097271401 Site 2 n/a Streambed 08/29/2006 200707203 21.0 <3.5 <3.0 <1.5 <1.0 <.5

324636097271401 Site 1 n/a Streambed 11/16/2004 200502001 22.8 <3.5 <3.0 <1.5 <1.0 <.5

324636097271401 Site 1 dup n/a Streambed 11/16/2004 200502001 22.8 <3.5 <3.0 <1.5 <1.0 <.5

324636097271401 Site 1 n/a Streambed 08/29/2006 200707203 22.2 <3.5 <3.0 <1.5 <1.0 E.2

324636097271401 Site 1 dup n/a Streambed 08/29/2006 200710906 19.8 <3.5 <3.0 <1.5 E.4 E.4

324632097270901 OF4 Flume n/a Suspended 11/16/2004 200502001 1.0 <88 <75 <37 <25 <12

324632097270901 OF4 Flume n/a Suspended 12/06/2004 200502405 1.3 <67 <57 <29 <19 <10

324632097270901 OF4 Flume n/a Suspended 08/27/2006 200706709 .58 <150 <130 <64 <43 <22

08045359 OF4 n/a Suspended 10/22/2004 200502001 15.6 <3.5 <3.0 <1.5 <1.0 E.3

08045359 OF4 n/a Suspended 11/16/2004 200502405 1.3 <67 <57 <29 <19 <10

08045359 OF4 n/a Suspended 12/06/2004 200502405 1.7 <49 <42 <21 <14 <7.0

08045359 OF4 n/a Suspended 08/27/2006 200706709 .69 <130 <110 <54 <36 <18

08045359 OF4 n/a Suspended 10/10/2006 200708606 2.4 <35 <30 <15 <10 <5.0

324638097270901 OF5 n/a Suspended 10/22/2004 200502001 .54 <160 <140 <68 <45 <22

324638097270901 OF51 n/a Suspended 10/10/2006 200708606 .17 <500 <430 <220 <140 <72

324638097270901 OF5 n/a Suspended 05/24/2007 200715504 11.7 <7.0 <6.0 <3.0 E1.7 2.5

324638097270901 OF5 dup n/a Suspended 05/24/2007 200715504 11.7 <7.0 <6.0 <3.0 E1.8 2.4

08045360 LMRC n/a Suspended 08/27/2006 200706709 133 <3.5 <3.0 <1.5 <1.0 <.5

08045360 LMRC n/a Streambed 08/29/2006 200707203 22.1 <3.5 <3.0 <1.5 E.5 E.5

08045360 LMRC n/a Suspended 10/10/2006 200708606 5.7 <14 <12 <6.0 E3.0 2.6

08045360 LMRC dup n/a Suspended 10/10/2006 200708606 9.3 <10 <9.0 <4.5 E2.4 2.1

Footnotes at end of table.
46 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

p,p’-

Methoxychlor

Hexachlorobenzene

Mirex

cisChlordanetransChlordane

Lake bottom sediments

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 08/28/2006 200636101 20.6 <3.5 <3.0 <1.5 <1.0 E0.5

324646097271601 WWD.B7 0-1 .5 Lake bottom 08/28/2006 200703201 16.6 <3.5 <3.0 <1.5 1.2 2.0

324649097271601 WWD.3 0-1 .5 Lake bottom 08/28/2006 200703606 15.7 <3.5 <3.0 <1.5 E.4 .5

324649097271601 WWD.3 1-3 2.0 Lake bottom 08/28/2006 200703606 17.4 <3.5 <3.0 <1.5 E.4 E.5

324649097271601 WWD.3 3-5 4.0 Lake bottom 08/28/2006 200703606 18.4 <3.5 <3.0 <1.5 E.5 .6

324649097271601 WWD.3 5-10 7.5 Lake bottom 08/28/2006 200703606 19.6 <3.5 <3.0 <1.5 E.4 E.5

324649097271601 WWD.3 10-13 11.5 Lake bottom 08/28/2006 200703606 17.4 <3.5 <3.0 <1.5 E.5 .7

324649097271601 WWD.3 10-13 dup 11.5 Lake bottom 08/28/2006 200703606 17.4 <3.5 <3.0 <1.5 E.4 E.3

324652097271601 WWD.B8 0-1 .5 Lake bottom 08/28/2006 200634208 14.5 <3.5 <3.0 <1.5 <1.0 <.5

324654097271601 WWD.B9 0-1 .5 Lake bottom 08/28/2006 200636101 13.5 <3.5 <3.0 <1.5 <1.0 E.3

Texas National Guard arm

324647097272101 WWD.B4 0-2 1.0 Lake bottom 08/28/2006 200636101 12.2 <7.0 <6.0 <3.0 <2.0 <1.0

324647097272101 WWD.B4 0-2 dup 1.0 Lake bottom 08/28/2006 200636101 12.7 <7.0 <6.0 <3.0 <2.0 <1.0

324649097271901 WWD.B5 0-1 .5 Lake bottom 08/28/2006 200703201 22.5 <3.5 <3.0 <1.5 <1.0 <.5

324649097271901 WWD.B5 0-1 dup .5 Lake bottom 08/28/2006 200703201 22.4 <3.5 <3.0 <1.5 <1.0 <.5

Gruggs arm

324658097273301 WWD.B1 0-1.5 .75 Lake bottom 08/28/2006 200703201 16.6 <3.5 <3.0 <1.5 E.9 1.1

324658097273001 WWD.B2 0-1 .5 Lake bottom 08/28/2006 200636101 19.3 <3.5 <3.0 <1.5 <1.0 <.5

324656097272301 WWD.B3 0-1 .5 Lake bottom 08/28/2006 200636101 11.6 <7.0 <6.0 <3.0 <2.0 <1.0

324658097272501 WWD.2 0-1 .5 Lake bottom 08/28/2006 200703606 16.1 <3.5 <3.0 <1.5 E.4 E.4

324658097272501 WWD.2 0-1 dup .5 Lake bottom 08/28/2006 200703606 16.2 <3.5 <3.0 <1.5 E.4 E.4

324658097272501 WWD.2 1-3 2.0 Lake bottom 08/28/2006 200703606 15.3 <3.5 <3.0 <1.5 E.5 E.4

324658097272501 WWD.2 3-5 4.0 Lake bottom 08/28/2006 200703606 16.3 <3.5 <3.0 <1.5 E.4 E.4

324658097272501 WWD.2 5-10 7.5 Lake bottom 08/28/2006 200703606 16.0 <3.5 <3.0 <1.5 E.6 .6

324658097272501 WWD.2 10-15 12.5 Lake bottom 08/28/2006 200703606 15.9 <3.5 <3.0 <1.5 E.3 E.3

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 08/28/2006 200703201 12.1 <7.0 <6.0 <3.0 <2.0 <1.0

324657097271901 WWD.1 1-3 2.0 Lake bottom 08/28/2006 200703201 12.7 <7.0 <6.0 <3.0 <2.0 <1.0

324657097271901 WWD.1 3-5 4.0 Lake bottom 08/28/2006 200703201 14.6 <3.5 <3.0 <1.5 <1.0 E.3

324657097271901 WWD.1 5-10 7.5 Lake bottom 08/28/2006 200703201 13.3 <7.0 <6.0 <3.0 <2.0 <1.0

324657097271901 WWD.1 10-15 12.5 Lake bottom 08/28/2006 200703201 13.7 <7.0 <6.0 <3.0 <2.0 <1.0

324659097271601 WWD.B10 0-1 .5 Lake bottom 08/28/2006 200703201 12.8 <7.0 <6.0 <3.0 <2.0 <1.0

324800097271701 WWD.B11 0-1 .5 Lake bottom 08/28/2006 200636101 11.1 <7.0 <6.0 <3.0 <2.0 <1.0

324700097271901 WWD.B12 0-1 .5 Lake bottom 08/28/2006 200703201 12.6 <7.0 <6.0 <3.0 <2.0 <1.0

Upper Woods Inlet

324703097271401 WWD.B13 0-1 .5 Lake bottom 08/28/2006 200634208 10.8 <7.0 <6.0 <3.0 <2.0 <1.0

324704097271601 WWD.B14 0-2 1.0 Lake bottom 08/28/2006 200636101 12.0 <7.0 <6.0 <3.0 <2.0 <1.0

324705097271701 WWD.B15 0-2 1.0 Lake bottom 08/28/2006 200636101 21.7 <3.5 <3.0 <1.5 <1.0 <.5

324703097270901 WWD.B16 0-1 .5 Lake bottom 08/28/2006 200636101 11.2 <7.0 <6.0 <3.0 <2.0 <1.0

324709097271201 WWD.B17 0-2 1.0 Lake bottom 08/28/2006 200703201 10.7 <7.0 <6.0 <3.0 <2.0 <1.0

Sediment quality guidelines

Threshold effect concentration (TEC)2 - - - - - - - - - - - - - - - - - - - -

Probable effect concentration (PEC)2 - - - - - - - - - - - - - - - - - - - -

Footnotes at end of table.
Appendix 2 47

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

transNonachlor

Surrogates, percent recovery 

(acceptable range)

Isodrin alphaHCH-d6

Nonachlorobiphenyl

Suspended and streambed sediments

08045355 UMRC n/a Suspended 08/27/2006 200706709 9.9 <2.5 53 (41-121) 74 (58-124) 62 (14-142)

08045355 UMRC n/a Streambed 08/29/2006 200706709 8.9 <1.0 78 (41-121) 82 (58-124) 80 (14-142)

08045355 UMRC n/a Suspended 10/10/2006 200708606 .97 <26 79 (41-121) 83 (58-124) 89 (14-142)

324614097272501 Site 7 n/a Streambed 11/16/2004 200502001 20.3 E.8 68 (42-94) 74 (21-140) 150 (19-125)

324614097272501 Site 7 n/a Streambed 08/29/2006 200706709 20.5 1.3 74 (41-121) 86 (58-124) 79 (14-142)

324621097271801 Site 6 n/a Streambed 11/16/2004 200502001 23.5 <1.0 75 (42-94) 55 (21-140) 140 (19-125)

324621097271801 Site 6 n/a Streambed 08/29/2006 200706709 20.5 E.9 50 (41-121) 87 (58-124) 56 (14-142)

324626097271701 Site 5 n/a Streambed 11/16/2004 200502001 20.2 <1.0 80 (42-94) 93 (21-140) 150 (19-125)

324626097271701 Site 5 n/a Streambed 08/29/2006 200706709 22.7 E.6 59 (41-121) 82 (58-124) 61 (14-142)

324628097271601 Site 8 n/a Streambed 11/16/2004 200502001 22.1 <1.0 47 (42-94) 59 (21-140) 120 (19-125)

324628097271601 Site 8 n/a Streambed 08/29/2006 200706709 24.7 <1.0 68 (41-121) 85 (58-124) 70 (14-142)

324628097271601 Site 8 dup n/a Streambed 08/29/2006 200706709 23.6 <1.0 63 (41-121) 84 (58-124) 67 (14-142)

324629097271601 Site 4 n/a Streambed 11/16/2004 200502001 22.9 <1.0 66 (42-94) 74 (21-140) 130 (19-125)

324629097271601 Site 4 n/a Streambed 08/29/2006 200706709 21.5 E.8 63 (41-121) 88 (58-124) 62 (14-142)

324627097271601 SSO n/a Suspended 11/16/2004 200502405 1.4 <17 48 (42-94) 79 (21-140) 120 (19-125)

324627097271601 SSO n/a Suspended 12/06/2004 200502405 2.8 <8.0 50 (42-94) 68 (21-140) 98 (19-125)

324634097271501 Site 3 n/a Streambed 11/16/2004 200502001 18.5 <1.0 52 (42-94) 82 (21-140) 140 (19-125)

324634097271501 Site 3 n/a Streambed 08/29/2006 200707203 20.2 <1.0 72 (41-121) 68 (58-124) 94 (14-142)

324635097271401 Site 2 n/a Streambed 11/16/2004 200502001 25.2 <1.0 49 (42-94) 62 (21-140) 130 (19-125)

324635097271401 Site 2 n/a Streambed 08/29/2006 200707203 21.0 <1.0 76 (41-121) 77 (58-124) 98 (14-142)

324636097271401 Site 1 n/a Streambed 11/16/2004 200502001 22.8 <1.0 62 (42-94) 70 (21-140) 110 (19-125)

324636097271401 Site 1 dup n/a Streambed 11/16/2004 200502001 22.8 <1.0 48 (42-94) 52 (21-140) 120 (19-125)

324636097271401 Site 1 n/a Streambed 08/29/2006 200707203 22.2 <1.0 73 (41-121) 70 (58-124) 99 (14-142)

324636097271401 Site 1 dup n/a Streambed 08/29/2006 200710906 19.8 E.4 78 (41-121) 86 (58-124) 84 (14-142)

324632097270901 OF4 Flume n/a Suspended 11/16/2004 200502001 1.0 <25 59 (42-94) 77 (21-140) 120 (19-125)

324632097270901 OF4 Flume n/a Suspended 12/06/2004 200502405 1.3 <19 49 (42-94) 74 (21-140) 90 (19-125)

324632097270901 OF4 Flume n/a Suspended 08/27/2006 200706709 .58 <43 71 (41-121) 77 (58-124) 76 (14-142)

08045359 OF4 n/a Suspended 10/22/2004 200502001 15.6 <1.0 69 (42-94) 79 (21-140) 170 (19-125)

08045359 OF4 n/a Suspended 11/16/2004 200502405 1.3 <19 57 (42-94) 77 (21-140) 120 (19-125)

08045359 OF4 n/a Suspended 12/06/2004 200502405 1.7 <14 61 (42-94) 85 (21-140) 110 (19-125)

08045359 OF4 n/a Suspended 08/27/2006 200706709 .69 <36 72 (41-121) 83 (58-124) 76 (14-142)

08045359 OF4 n/a Suspended 10/10/2006 200708606 2.4 <10 76 (41-121) 75 (58-124) 81 (14-142)

324638097270901 OF5 n/a Suspended 10/22/2004 200502001 .54 <45 76 (42-94) 83 (21-140) 140 (19-125)

324638097270901 OF51 n/a Suspended 10/10/2006 200708606 .17 <140 87 (41-121) 82 (58-124) 88 (14-142)

324638097270901 OF5 n/a Suspended 05/24/2007 200715504 11.7 <2.0 50 (41-121) 66 (58-124) 92 (14-142)

324638097270901 OF5 dup n/a Suspended 05/24/2007 200715504 11.7 <2.0 50 (41-121) 62 (58-124) 90 (14-142)

08045360 LMRC n/a Suspended 08/27/2006 200706709 133 <1.0 50 (41-121) 76 (58-124) 60 (14-142)

08045360 LMRC n/a Streambed 08/29/2006 200707203 22.1 E.5 71 (41-121) 72 (58-124) 100 (14-142)

08045360 LMRC n/a Suspended 10/10/2006 200708606 5.7 4.2 67 (41-121) 72 (58-124) 81 (14-142)

08045360 LMRC dup n/a Suspended 10/10/2006 200708606 9.3 3.5 59 (41-121) 74 (58-124) 76 (14-142)

Footnotes at end of table.
48 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 2. Polychlorinated biphenyl (PCB) Aroclor and congener, organic carbon, and organochlorine pesticide concentrations in 

suspended, streambed, and lake-bottom sediment samples from sites in and near Meandering Road Creek and Woods Inlet of Lake 

Worth, Fort Worth, Texas, 2004 and 2006–07—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Set 

number

Sample 

weight 

(grams)

transNonachlor

Surrogates, percent recovery 

(acceptable range)

Isodrin alphaHCH-d6

Nonachlorobiphenyl

Lake bottom sediments

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 08/28/2006 200636101 20.6 <1.0 62 (41-121) 110 (58-124) 97 (14-142)

324646097271601 WWD.B7 0-1 .5 Lake bottom 08/28/2006 200703201 16.6 1.1 76 (41-121) 83 (58-124) 89 (14-142)

324649097271601 WWD.3 0-1 .5 Lake bottom 08/28/2006 200703606 15.7 E.5 60 (41-121) 89 (58-124) 76 (14-142)

324649097271601 WWD.3 1-3 2.0 Lake bottom 08/28/2006 200703606 17.4 E.4 70 (41-121) 82 (58-124) 78 (14-142)

324649097271601 WWD.3 3-5 4.0 Lake bottom 08/28/2006 200703606 18.4 E.5 75 (41-121) 90 (58-124) 84 (14-142)

324649097271601 WWD.3 5-10 7.5 Lake bottom 08/28/2006 200703606 19.6 E.4 76 (41-121) 85 (58-124) 82 (14-142)

324649097271601 WWD.3 10-13 11.5 Lake bottom 08/28/2006 200703606 17.4 <1.0 72 (41-121) 66 (58-124) 76 (14-142)

324649097271601 WWD.3 10-13 dup 11.5 Lake bottom 08/28/2006 200703606 17.4 <1.0 64 (41-121) 73 (58-124) 71 (14-142)

324652097271601 WWD.B8 0-1 .5 Lake bottom 08/28/2006 200634208 14.5 <1.0 63 (41-121) 75 (58-124) 90 (14-142)

324654097271601 WWD.B9 0-1 .5 Lake bottom 08/28/2006 200636101 13.5 <1.0 63 (41-121) 99 (58-124) 79 (14-142)

Texas National Guard arm

324647097272101 WWD.B4 0-2 1.0 Lake bottom 08/28/2006 200636101 12.2 <2.0 74 (41-121) 88 (58-124) 98 (14-142)

324647097272101 WWD.B4 0-2 dup 1.0 Lake bottom 08/28/2006 200636101 12.7 <2.0 74 (41-121) 98 (58-124) 96 (14-142)

324649097271901 WWD.B5 0-1 .5 Lake bottom 08/28/2006 200703201 22.5 <1.0 88 (41-121) 94 (58-124) 92 (14-142)

324649097271901 WWD.B5 0-1 dup .5 Lake bottom 08/28/2006 200703201 22.4 <1.0 110 (41-121) 90 (58-124) 110 (14-142)

Gruggs arm

324658097273301 WWD.B1 0-1.5 .75 Lake bottom 08/28/2006 200703201 16.6 1.1 73 (41-121) 87 (58-124) 82 (14-142)

324658097273001 WWD.B2 0-1 .5 Lake bottom 08/28/2006 200636101 19.3 <1.0 69 (41-121) 46 (58-124) 88 (14-142)

324656097272301 WWD.B3 0-1 .5 Lake bottom 08/28/2006 200636101 11.6 <2.0 60 (41-121) 100 (58-124) 82 (14-142)

324658097272501 WWD.2 0-1 .5 Lake bottom 08/28/2006 200703606 16.1 E.4 89 (41-121) 85 (58-124) 100 (14-142)

324658097272501 WWD.2 0-1 dup .5 Lake bottom 08/28/2006 200703606 16.2 E.5 79 (41-121) 89 (58-124) 87 (14-142)

324658097272501 WWD.2 1-3 2.0 Lake bottom 08/28/2006 200703606 15.3 E.5 70 (41-121) 90 (58-124) 78 (14-142)

324658097272501 WWD.2 3-5 4.0 Lake bottom 08/28/2006 200703606 16.3 E.4 69 (41-121) 78 (58-124) 76 (14-142)

324658097272501 WWD.2 5-10 7.5 Lake bottom 08/28/2006 200703606 16.0 E.5 82 (41-121) 86 (58-124) 59 (14-142)

324658097272501 WWD.2 10-15 12.5 Lake bottom 08/28/2006 200703606 15.9 <1.0 67 (41-121) 85 (58-124) 71 (14-142)

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 08/28/2006 200703201 12.1 <2.0 72 (41-121) 82 (58-124) 74 (14-142)

324657097271901 WWD.1 1-3 2.0 Lake bottom 08/28/2006 200703201 12.7 <2.0 75 (41-121) 81 (58-124) 78 (14-142)

324657097271901 WWD.1 3-5 4.0 Lake bottom 08/28/2006 200703201 14.6 <1.0 89 (41-121) 79 (58-124) 90 (14-142)

324657097271901 WWD.1 5-10 7.5 Lake bottom 08/28/2006 200703201 13.3 <2.0 87 (41-121) 110 (58-124) 86 (14-142)

324657097271901 WWD.1 10-15 12.5 Lake bottom 08/28/2006 200703201 13.7 <2.0 79 (41-121) 76 (58-124) 75 (14-142)

324659097271601 WWD.B10 0-1 .5 Lake bottom 08/28/2006 200703201 12.8 <2.0 78 (41-121) 89 (58-124) 80 (14-142)

324800097271701 WWD.B11 0-1 .5 Lake bottom 08/28/2006 200636101 11.1 <2.0 70 (41-121) 92 (58-124) 91 (14-142)

324700097271901 WWD.B12 0-1 .5 Lake bottom 08/28/2006 200703201 12.6 <2.0 E120 

(41-121)

93 (58-124) 130 (14-142)

Upper Woods Inlet

324703097271401 WWD.B13 0-1 .5 Lake bottom 08/28/2006 200634208 10.8 <2.0 63 (41-121) 75 (58-124) 77 (14-142)

324704097271601 WWD.B14 0-2 1.0 Lake bottom 08/28/2006 200636101 12.0 <2.0 60 (41-121) 89 (58-124) 77 (14-142)

324705097271701 WWD.B15 0-2 1.0 Lake bottom 08/28/2006 200636101 21.7 <1.0 88 (41-121) 88 (58-124) 100 (14-142)

324703097270901 WWD.B16 0-1 .5 Lake bottom 08/28/2006 200636101 11.2 <2.0 70 (41-121) 96 (58-124) 84 (14-142)

324709097271201 WWD.B17 0-2 1.0 Lake bottom 08/28/2006 200703201 10.7 <2.0 78 (41-121) 80 (58-124) 74 (14-142)

Sediment quality guidelines

Threshold effect concentration (TEC)2 - - - - - - - - - - - - - - - - - -

Probable effect concentration (PEC)2 - - - - - - - - - - - - - - - - - -

1

 Sample required custom preparation (air dried) at the laboratory because normal centrifugation could not separate solids from water.

2

 MacDonald and others (2000).
Appendix 3 49

Appendix 3

Appendix 3. Quality control laboratory blank and spike sample results for polychlorinated biphenyl (PCB) Aroclor and organochlorine pesticide analyses for samples from sites in and near Meandering Road Creek and Woods Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07. [ID, identifier; <, less than; - -, not available]

Sample ID Set number PCB Aroclor 1016/1242 PCB Aroclor 1254 PCB Aroclor 1260 beta- HCH alpha- HCH Aldrin Lindane p,p’- DDD p,p’- DDE

Blank, in micrograms per kilogram 200634208 <5.0 <5.0 <5.0 <0.5 <1.5 <2.0 <0.5 <2.5 <1.5

Spike, in percent recovery (acceptable range) 200634208 91 (38-116) 117 (56-152) 106 (52-142) 84 (45-95) 74 (40-86) 70 (48-106) 78 (39-91) 85 (30-116) 81 (46-112)

Blank, in micrograms per kilogram 200636101 <5.0 <5.0 <5.0 <.5 <1.5 <2.0 <.5 <2.5 <1.5

Spike, in percent recovery (acceptable range) 200636101 95 (38-116) 116 (56-152) 121 (52-142) - - - - 66 (48-106) - - - - 65 (46-112)

Blank, in micrograms per kilogram 200703201 <5.0 <5.0 <5.0 <.5 <1.5 <2.0 <.5 <2.5 <1.5

Spike, in percent recovery (acceptable range) 200703201 12 (38-116) 18 (56-152) 15 (52-142) 83 (45-95) 77 (40-86) 88(48-106) 82 (39-91) 90 (30-116) 107 (46-112)

Blank, in micrograms per kilogram 200703606 <5.0 <5.0 <5.0 <.5 <1.5 <2.0 <.5 <2.5 <1.5

Spike, in percent recovery (acceptable range) 200703606 - - - - - - - - - - - - - - - - - -

Blank, in micrograms per kilogram 200706709 <5.0 <5.0 <5.0 <.5 <1.5 <2.0 <.5 <2.5 <1.5

Spike, in percent recovery (acceptable range) 200706709 154 (38-116) 211 (56-152) 138 (52-142) 79 (45-95) 72 (40-86) 73 (48-106) 73 (39-91) 89 (30-116) 80 (46-112)

Blank, in micrograms per kilogram 200502001 <5.0 <5.0 <5.0 <.5 <1.5 <2.0 <.5 <2.5 <1.5

Spike, in percent recovery (acceptable range) 200502001 70 (29-109) 112 (43-131) 73 (50-122) 69 (47-87) 69 (39-79) 72 (33-99) 68 (30-84) 65 (22-110) 91 (49-121)

Blank, in micrograms per kilogram 200502405 <5.0 <5.0 <5.0 <.5 <1.5 <2.0 <.5 <2.5 <1.5

Spike, in percent recovery (acceptable range) 200502405 64 (29-109) 115 (43-131) 109 (50-122) 64 (47-87) 65 (39-79) 72 (33-99) 61 (30-84) 71 (22-110) 96 (49-121)

Blank, in micrograms per kilogram 200715504 <5.0 <5.0 <5.0 <.5 <1.5 <2.0 <.5 <2.5 <1.5

Spike, in percent recovery (acceptable range) 200715504 76 (38-116) 68 (56-152) 96 (52-142) 78 (45-95) 67 (40-86) 69 (48-106) 71 (39-91) 67 (30-116) 68 (46-112)
50 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas Appendix 3. Quality control laboratory blank and spike sample results for polychlorinated biphenyl (PCB) Aroclor and organochlorine pesticide analyses for samples from sites in and near Meandering Road Creek and Woods Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07—Continued. Sample ID Set number p,p’- DDT Dieldrin alpha- Endosulfan Endrin Toxaphene Heptachlor Heptachlor epoxide p,p’- Methoxychlor Blank, in micrograms per kilogram 200634208 <1.0 <0.5 <0.5 <1.0 <200 <1.0 <1.5 <3.5 Spike, in percent recovery (acceptable range) 200634208 86 (42-136) 95 (49-100) 88 (48-86) 101 (14-129) <200 (not spiked) 44 (40-85) 93 (43-102) 105 (7-127) Blank, in micrograms per kilogram 200636101 <1.0 <.5 <.5 <1.0 <200 <1.0 <1.5 <3.5 Spike, in percent recovery (acceptable range) 200636101 62 (42-136) - - - - - - <200 (not spiked) 58 (40-85) - - - - Blank, in micrograms per kilogram 200703201 <1.0 <.5 <.5 <1.0 <200 <1.0 <1.5 <3.5 Spike, in percent recovery (acceptable range) 200703201 88 (42-136) 86 (49-100) 81 (48-86) 80 (14-129) <200 (not spiked) 3.1 (40-85) 86 (43-102) 92 (7-127) Blank, in micrograms per kilogram 200703606 <1.0 <.5 <.5 <1.0 <200 <1.0 <1.5 <3.5 Spike, in percent recovery (acceptable range) 200703606 - - - - - - - - - - - - - - - - Blank, in micrograms per kilogram 200706709 <1.0 <.5 <.5 <1.0 <200 <1.0 <1.5 <3.5 Spike, in percent recovery (acceptable range) 200706709 77 (42-136) 83 (49-100) 80 (48-86) 84 (14-129) <200 (not spiked) 26 (40-85) 82 (43-102) 86 (7-127) Blank, in micrograms per kilogram 200502001 <1.0 <.5 <.5 <1.0 <200 <1.0 <1.5 <3.5 Spike, in percent recovery (acceptable range) 200502001 94 (37-99) 89 (40-98) 67 (39-83) 73 (39-111) <200 (not spiked) 44 (21-98) 74 (43-88) 81 (7-135) Blank, in micrograms per kilogram 200502405 <1.0 <.5 <.5 <1.0 <200 <1.0 <1.5 <3.5

Spike, in percent recovery (acceptable range) 200502405 112 (37-99) 92 (40-98) 68 (39-83) 74 (39-111) <200 (not spiked) 67 (21-98) 72 (43-88) 90 (7-135)

Blank, in micrograms per kilogram 200715504 <1.0 <.5 <.5 <1.0 <200 <1.0 <1.5 <3.5

Spike, in percent recovery (acceptable range) 200715504 83 (42-136) 87 (49-100) 71 (48-86) 73 (14-129) <200 (not spiked) 65 (40-85) 80 (43-102) 76 (7-127)
Appendix 3 51

Appendix 3. Quality control laboratory blank and spike sample results for polychlorinated biphenyl (PCB) Aroclor and organochlorine pesticide analyses for samples from sites in and near Meandering Road Creek and Woods Inlet of Lake Worth, Fort Worth, Texas, 2004 and 2006–07—Continued. 

Sample ID Set number Hexachloro- benzene Mirex cis- Chlordane trans- Chlordane trans- Nonachlor Sample weight (grams)

Surrogates in percent recovery 

(acceptable range)

Isodrin alpha- HCH-d6 Nonachloro- biphenyl

Blank, in micrograms per kilogram 200634208 <3.0 <1.5 <1.0 <0.5 <1.0 25.0 76 (41-121) 63 (58-124) 96 (14-142)

Spike, in percent recovery (acceptable range) 200634208 52 (39-108) 79 (48-118) 92 (50-96) 92 (51-97) 87 (42-100) 25.0 70 (41-121) 76 (58-124) 87 (14-142)

Blank, in micrograms per kilogram 200636101 <3.0 <1.5 <1.0 <.5 <1.0 25.0 100 (41-121) - - 110 (14-142)Spike, in percent recovery (acceptable range) 200636101 78 (39-108) 70 (48-118) 66 (50-96) 66 (51-97) 77 (42-100) 25.0 68 (41-121) - - 75 (14-142)

Blank, in micrograms per kilogram 200703201 <3.0 <1.5 <1.0 <.5 <1.0 25.0 91 (41-121) 68 (58-124) 100 (14-142)Spike, in percent recovery (acceptable range) 200703201 85 (39-108) 92 (48-118) 86 (50-96) 87 (51-97) 86 (42-100) 25.0 100 (41-121) 87 (58-124) 110 (14-142)

Blank, in micrograms per kilogram 200703606 <3.0 <1.5 <1.0 <.5 <1.0 25.0 71 (41-121) 68 (58-124) 81 (14-142)

Spike, in percent recovery (acceptable range) 200703606 - - - - - - - - - - - - - - - - - -

Blank, in micrograms per kilogram 200706709 <3.0 <1.5 <1.0 <.5 <1.0 25.0 66 (41-121) 77 (58-124) 79 (14-142)

Spike, in percent recovery (acceptable range) 200706709 69 (39-108) 78 (48-118) 82 (50-96) 82 (51-97) 82 (42-100) 25.0 84 (41-121) 84 (58-124) 91 (14-142)

Blank, in micrograms per kilogram 200502001 <3.0 <1.5 <1.0 <.5 <1.0 25.0 66 (42-94) 88 (21-140) 110 (19-125)Spike, in percent recovery (acceptable range) 200502001 71 (29-83) 83 (46-98) 71 (43-87) 72 (48-84) 73 (46-90) 25.0 70 (42-94) 86 (21-140) 120 (19-125)

Blank, in micrograms per kilogram 200502405 <3.0 <1.5 <1.0 <.5 <1.0 25.0 75 (42-94) 98 (21-140) 130 (19-125)Spike, in percent recovery (acceptable range) 200502405 70 (29-83) 91 (46-98) 71 (43-87) 69 (48-84) 72 (46-90) 25.0 74 (42-94) 92 (21-140) 120 (19-125)

Blank, in micrograms per kilogram 200715504 <3.0 <1.5 <1.0 <.5 <1.0 25.0 85 (41-121) 75 (58-124) 90 (14-142)

Spike, in percent recovery (acceptable range) 200715504 67 (39-108) 83 (48-118) 86 (50-96) 70 (51-97) 74 (42-100) 25.0 82 (41-121) 76 (58-124) 86 (14-142)
52 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 4

Appendix 4. Volatile organic compound concentrations in water samples from sites on or near Meandering Road Creek, Lake Worth, Fort Worth, Texas, 2004 (Connor and others, 1997).[In micrograms per liter except as noted. USGS, U.S. Geological Survey; ID, identifier; <, less than; E, estimated; - -, not applicable]

USGS 

station ID Sample ID Sample date Dibromo- methane Bromo- dichloro- methane Tetra- chloro- methane 1,2-Di- chloro- ethane Bromo- form Dibromo- chloro- methane Chloro- form Tolu- ene Ben- zene Acrylo- nitrile Chloro- ben- zene Chloro- eth- ane Ethyl- ben- zene 

324627097271601 SSO 11/16/2004 <0.1 <0.06 <0.12 <0.26 <0.2 <0.2 <0.05 E0.03 E0.04 <1.6 0.40 <0.24 <0.06

324627097271601 SSO 12/06/2004 <.05 <.03 <.06 <.13 <.1 <.1 <.02 <.02 <.02 <.8 <.03 <.12 <.03

324632097270901 OF4 Flume 11/16/2004 <.1 <.06 <.12 <.26 <.2 <.2 <.05 <.04 <.04 <1.6 <.06 <.24 <.06

324632097270901 OF4 Flume 12/06/2004 <.05 <.03 <.06 <.13 <.1 <.1 <.02 E.02 <.02 <.8 <.03 <.12 <.03

08045359 OF4 10/22/2004 <.05 <.03 <.06 8.6 <.1 <.1 E.05 0.14 E.02 <.8 <.03 <.12 <.03

08045359 OF4 11/16/2004 <.1 <.06 <.12 0.61 <.2 <.2 <.05 <.04 <.04 <1.6 <.06 <.24 <.06

08045359 OF4 12/06/2004 <.05 <.03 <.06 <.13 <.1 <.1 <.02 <.02 <.02 <.8 <.03 <.12 <.03

324638097270901 OF5 10/22/2004 <.05 <.03 <.06 <.13 <.1 <.1 E.01 <.02 <.02 <.8 <.03 <.12 <.03

Quality control samples08045359 OF4 - Field blank 10/27/2004 <.05 <.03 <.06 <.13 <.1 <.1 <.02 <.02 <.02 <.8 <.03 <.12 <.03

- - Laboratory blank 1 - - <.05 <.03 <.06 <.13 <.1 <.1 <.02 <.02 <.02 <.8 <.03 <.12 <.03

- - Laboratory spike 1, in 

percent recovery

- - 102.3 106.5 105.9 104.3 105.5 99.9 102.2 100.8 102.0 105.2 98.5 105.1 102.5

- - Laboratory blank 2 - - <.05 <0.03 <.06 <.13 <.1 <.1 <.02 <.02 <.02 <.8 <.03 <.12 <.03

- - Laboratory spike 2, in 

percent recovery

- - 93.0 98.5 82.5 90.3 92.7 91.8 92.9 93.9 95.0 100.6 95.9 91.2 94.4
Appendix 4 53

Appendix 4. Volatile organic compound concentrations in water samples from sites on or near Meandering Road Creek, Lake Worth, Fort Worth, Texas, 2004 (Connor and others, 1997)—Continued.

USGS 

station ID Sample ID Sample date Hexa- chloro- ethane Bromo- meth- ane Chloro- meth- ane Dichloro- meth- ane Tetra- chloro- ethylene Trichloro- fluoro- methane 1,1-Di- chloro- ethane 1,1-Di- chloro- ethyl- ene 1,1,1-Tri- chloro- ethane 1,1,2-Tri- chloro- ethane 1,1,2,2- Tetra- chloro- ethane 1,2-Di- chloro- ben- zene 1,2-Di- chloro- pro- pane 

324627097271601 SSO 11/16/2004 <0.28 <0.52 <0.34 <0.12 <0.06 <0.16 <0.07 E0.06 <0.06 <0.08 <0.16 1.3 <0.06

324627097271601 SSO 12/06/2004 <.14 <.26 <.17 <.06 <.03 <.08 <.04 <.02 <.03 <.04 <.08 <.05 <.03

324632097270901 OF4 Flume 11/16/2004 <.28 <.52 <.34 <.12 <.06 <.16 <.07 <.05 <.06 <.08 <.16 <.10 <.06

324632097270901 OF4 Flume 12/06/2004 <.14 <.26 <.17 <.06 <.03 <.08 <.04 <.02 <.03 <.04 <.08 <.05 <.03

08045359 OF4 10/22/2004 <.14 <.26 <.17 <.06 <.03 <.08 <.04 0.11 <.03 <.04 <.08 <.05 <.03

08045359 OF4 11/16/2004 <.28 <.52 <.34 <.12 <.06 <.16 <.07 <.05 <.06 <.08 <.16 <.10 <.06

08045359 OF4 12/06/2004 <.14 <.26 <.17 <.06 <.03 <.08 <.04 <.02 <.03 <.04 <.08 <.05 <.03

324638097270901 OF5 10/22/2004 <.14 <.26 <.17 <.06 <.03 <.08 <.04 <.02 <.03 <.04 <.08 <.05 <.03

Quality control samples08045359 OF4 - Field blank 10/27/2004 <.14 <.26 <.17 <.06 <.03 <.08 <.04 <.02 <.03 <.04 <.08 <.05 <.03

- - Laboratory blank 1 - - <.14 <.26 <.17 <.06 <.03 <.08 <.04 <.02 <.03 <.04 <.08 <.05 <.03

- - Laboratory spike 1, in 

percent recovery

- - 96.7 E133.2 E108.3 99.2 105.8 113.7 104.1 109.3 106.9 102.1 95.6 102.0 97.9

- - Laboratory blank 2 - - <.14 <.26 <.17 <.06 <.03 <.08 <.04 <.02 <.03 <.04 <.08 <.05 <.03

- - Laboratory spike 2, in 

percent recovery

- - 89.4 E107.8 E99.4 91.7 94.6 84.3 93.0 87.7 84.3 95.1 95.7 93.8 94.7
54 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas Appendix 4. Volatile organic compound concentrations in water samples from sites on or near Meandering Road Creek, Lake Worth, Fort Worth, Texas, 2004 (Connor and others, 1997)—Continued. USGS station ID Sample ID Sample date trans-1,2- Dichloro- ethylene 1,2,4-Tri- chloro- ben- zene 1,3-Di- chloro- benzene 1,4-Di- chloro- ben- zene Dichloro- difluoro- methane Naph- tha- lene trans-1,3- Dichloro- propene cis-1,3- Dichloro- propene Vinyl chlo- ride Tri- chloro- ethyl- ene Hexa- chloro- buta- diene Methyl acryl- ate 324627097271601 SSO 11/16/2004 E0.12 <0.24 <0.06 0.25 <0.36 <1.0 <0.18 <0.1 3.0 1.1 <0.28 <2 324627097271601 SSO 12/06/2004 <.03 <.12 <.03 <.03 <.18 <.52 <.09 <.05 <.08 E.02 <.14 <1 324632097270901 OF4 Flume 11/16/2004 <.06 <.24 <.06 <.07 <.36 <1.0 <.18 <.1 <.16 <.08 <.28 <2 324632097270901 OF4 Flume 12/06/2004 <.03 <.12 <.03 <.03 <.18 <.52 <.09 <.05 <.08 <.04 <.14 <1 08045359 OF4 10/22/2004 1.0 <.12 <.03 <.03 <.18 <.52 <.09 <.05 6.1 0.18 <.14 <1 08045359 OF4 11/16/2004 E.11 <.24 <.06 <.07 <.36 <1.0 <.18 <.1 0.36 E.07 <.28 <2 08045359 OF4 12/06/2004 <.03 <.12 <.03 <.03 <.18 <.52 <.09 <.05 <.08 <.04 <.14 <1 324638097270901 OF5 10/22/2004 <.03 <.12 <.03 <.03 <.18 <.52 <.09 <.05 <.08 <.04 <.14 <1 Quality control samples 08045359 OF4 - Field blank 10/27/2004 <.03 <.12 <.03 <.03 <.18 <.52 <.09 <.05 <.08 <.04 <.14 <1 - - Laboratory blank 1 - - <.03 <.12 <.03 <.03 <.18 <.52 <.09 <.05 <.08 <.04 <.14 <1 - - Laboratory spike 1, in percent recovery - - 99.7 100.5 103.4 101.3 E93.9 91.1 96.9 94.2 122.9 102.5 112.8 103.1 - - Laboratory blank 2 - - <.03 <.12 <.03 <.03 <.18 <.52 <.09 <.05 <.08 <.04 <.14 <1 - - Laboratory spike 2, in percent recovery - - 91.0 90.3 94.1 93.3 E63.1 82.0 94.2 85.6 102.5 88.8 97.6 96.9
Appendix 4 55

Appendix 4. Volatile organic compound concentrations in water samples from sites on or near Meandering Road Creek, Lake Worth, Fort Worth, Texas, 2004 (Connor and others, 1997)—Continued.

USGS 

station ID Sample ID Sample date

1,2,3,4-

Tetramethylbenzene 

1,2,3,5-

Tetramethylbenzene Bromo- ethene Ethyl tert- butyl ether tert- Pentyl methyl ether trans-1,4- Dichloro-2- butene Ethyl metha- crylate Carbon disul- fide cis-1,2- Dichloro- ethylene 2- Hexa- none Sty- rene o- Xylene 1,1-Di- chloro- pro- pene 

324627097271601 SSO 11/16/2004 <0.28 <0.28 <0.2 <0.06 <0.08 <1.4 <0.36 <0.08 31 <0.8 <0.08 <0.08 <0.05

324627097271601 SSO 12/06/2004 <.14 <.14 <.1 <.03 <.04 <.7 <.18 <.04 0.29 <.4 <.04 <.04 <.03

324632097270901 OF4 Flume 11/16/2004 <.28 <.28 <.2 <.06 <.08 <1.4 <.36 <.08 <.05 <.8 <.08 <.08 <.05

324632097270901 OF4 Flume 12/06/2004 <.14 <.14 <.1 <.03 <.04 <.7 <.18 <.04 E.05 <.4 <.04 <.04 <.03

08045359 OF4 10/22/2004 <.14 <.14 <.1 <.03 <.04 <.7 <.18 <.04 50 <.4 <.04 <.04 <.03

08045359 OF4 11/16/2004 <.28 <.28 <.2 <.06 <.08 <1.4 <.36 <.08 4.9 <.8 <.08 <.08 <.05

08045359 OF4 12/06/2004 <.14 <.14 <.1 <.03 <.04 <.7 <.18 <.04 E.06 <.4 <.04 <.04 <.03

324638097270901 OF5 10/22/2004 <.14 <.14 <.1 <.03 <.04 <.7 <.18 <.04 <.02 <.4 <.04 <.04 <.03

Quality control samples08045359 OF4 - Field blank 10/27/2004 <.14 <.14 <.1 <.03 <.04 <.7 <.18 <.04 <.02 <.4 <.04 <.04 <.03

- - Laboratory blank 1 - - <.14 <.14 <.1 <.03 <.04 <.7 <.18 <.04 <.02 <.4 <.04 <.04 <.03

- - Laboratory spike 1, in 

percent recovery

- - 100.6 114.5 109.2 103.5 94.9 135.6 97.1 88.8 103.5 102.0 100.9 103.9 110.3

- - Laboratory blank 2 - - <.14 <.14 <.1 <.03 <.04 <.7 <.18 <.04 <.02 <.4 <.04 <.04 <.03

- - Laboratory spike 2, in 

percent recovery

- - 87.3 98.2 93.2 97.4 93.2 104.9 93.9 74.9 92.6 96.1 90.1 90.2 95.6
56 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas Appendix 4. Volatile organic compound concentrations in water samples from sites on or near Meandering Road Creek, Lake Worth, Fort Worth, Texas, 2004 (Connor and others, 1997)—Continued. USGS station ID Sample ID Sample date 2,2-Di- chloro- pro- pane 1,3-Di- chloro- pro- pane o-Ethyl tolu- ene 1,2,3-Tri- methyl- benzene 1,2,4-Tri- methyl- benzene Iso- propyl- ben- zene n- Propyl- ben- zene 1,3,5-Tri- methyl- benzene 2-Chloro- toluene 4-Chloro- toluene Bromo- chloro- methane Butyl- ben- zene 324627097271601 SSO 11/16/2004 <0.1 <0.12 <0.12 <0.12 <0.11 <0.08 <0.08 <0.09 <0.08 <0.10 <0.24 <0.24 324627097271601 SSO 12/06/2004 <.05 <.06 <.06 <.06 <.06 <.04 <.04 <.04 <.04 <.05 <.12 <.12 324632097270901 OF4 Flume 11/16/2004 <.1 <.12 <.12 <.12 <.11 <.08 <.08 <.09 <.08 <.10 <.24 <.24 324632097270901 OF4 Flume 12/06/2004 <.05 <.06 <.06 <.06 <.06 <.04 <.04 <.04 <.04 <.05 <.12 <.12 08045359 OF4 10/22/2004 <.05 <.06 <.06 <.06 <.06 <.04 <.04 <.04 <.04 <.05 <.12 <.12 08045359 OF4 11/16/2004 <.1 <.12 <.12 <.12 <.11 <.08 <.08 <.09 <.08 <.10 <.24 <.24 08045359 OF4 12/06/2004 <.05 <.06 <.06 <.06 <.06 <.04 <.04 <.04 <.04 <.05 <.12 <.12 324638097270901 OF5 10/22/2004 <.05 <.06 <.06 <.06 <.06 <.04 <.04 <.04 <.04 <.05 <.12 <.12 Quality control samples 08045359 OF4 - Field blank 10/27/2004 <.05 <.06 <.06 <.06 <.06 <.04 <.04 <.04 <.04 <.05 <.12 <.12 - - Laboratory blank 1 - - <.05 <.06 <.06 <.06 <.06 <.04 <.04 <.04 <.04 <.05 <.12 <.12 - - Laboratory spike 1, in percent recovery - - 106.8 99.7 97.9 99.8 107.3 107.7 106.9 103.1 104.7 100.1 100.6 104.0 - - Laboratory blank 2 - - <.05 <.06 <.06 <.06 <.06 <.04 <.04 <.04 <.04 <.05 <.12 <.12 - - Laboratory spike 2, in percent recovery - - 86.7 95.6 87.3 88.3 91.4 95.4 93.6 86.5 94.0 87.9 92.1 86.5
Appendix 4 57

Appendix 4. Volatile organic compound concentrations in water samples from sites on or near Meandering Road Creek, Lake Worth, Fort Worth, Texas, 2004 (Connor and others, 1997)—Continued.

USGS 

station ID Sample ID Sample date

secButylbenzene tert- Butyl- ben- zene 4-Iso- propyl-1- methyl- benzene Methyl iodide 1,2,3-Tri- chloro- propane 1,1,1,2- Tetra- chloro- ethane 1,2,3-Tri- chloro- ben- zene 1,2-Di- bromo- ethane 1,1,2-Tri- chloro- trifluoro- ethane tert- Butyl methyl ether 3-Chloro- pro- pene 4-Methyl- 2-penta- none Ace- tone 

324627097271601 SSO 11/16/2004 <0.12 <0.12 <0.16 <1.0 <0.36 <0.06 <0.36 <0.07 <0.08 E0.14 <1.0 E1.5 E8.8

324627097271601 SSO 12/06/2004 <.06 <.06 <.08 <.5 <.18 <.03 <.18 <.04 <.04 <.10 <.5 E.73 6.1

324632097270901 OF4 Flume 11/16/2004 <.12 <.12 <.16 <1.0 <.36 <.06 <.36 <.07 <.08 E.11 <1.0 <.74 14

324632097270901 OF4 Flume 12/06/2004 <.06 <.06 <.08 <.5 <.18 <.03 <.18 <.04 <.04 <.10 <.5 E.58 8.6

08045359 OF4 10/22/2004 <.06 <.06 <.08 <.5 <.18 <.03 <.18 <.04 <.04 E.06 <.5 E.61 12

08045359 OF4 11/16/2004 <.12 <.12 <.16 <1.0 <.36 <.06 <.36 <.07 <.08 E.10 <1.0 E.58 21

08045359 OF4 12/06/2004 <.06 <.06 <.08 <.5 <.18 <.03 <.18 <.04 <.04 <.10 <.5 <.37 E3.9

324638097270901 OF5 10/22/2004 <.06 <.06 <.08 <.5 <.18 <.03 <.18 <.04 <.04 <.10 <.5 E.85 13

Quality control samples08045359 OF4 - Field blank 10/27/2004 <.06 <.06 <.08 <.5 <.18 <.03 <.18 <.04 <.04 <.10 <.5 <.37 <6

- - Laboratory blank 1 - - <.06 <.06 <.08 <.5 <.18 <.03 <.18 <.04 <.04 <.10 <.5 <.37 <6

- - Laboratory spike 1, in 

percent recovery

- - 108.5 109.3 106.3 E95.4 96.1 98.6 97.4 100.9 116.1 97.9 E106.4 98.2 99.6

- - Laboratory blank 2 - - <.06 <.06 <.08 <.5 <.18 <.03 <.18 <.04 <.04 <.10 <.5 <.37 <6

- - Laboratory spike 2, in 

percent recovery

- - 94.3 94.1 91.6 E78.1 91.6 91.1 87.7 89.6 88.2 92.9 E92.2 86.3 102.9
58 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas Appendix 4. Volatile organic compound concentrations in water samples from sites on or near Meandering Road Creek, Lake Worth, Fort Worth, Texas, 2004 (Connor and others, 1997)—Continued. USGS station ID Sample ID Sample date Bromo- ben- zene Diethyl ether Diiso- propyl ether Methyl acrylo- nitrile 2- Buta- none Methyl metha- crylate Tetra- hydro- furan 1,2- Dibromo- 3-chloro- propane m- and p-Xylene Surrogates, percent recovery 1,2-Di- chloro- ethane- d4 Toluene- d8 1,4-Bromo- fluoro- benzene 324627097271601 SSO 11/16/2004 <0.06 <0.16 <0.2 <0.8 <4 <0.4 <2 <1.0 <0.12 114.6 98.3 95.3 324627097271601 SSO 12/06/2004 <.03 <.08 <.1 <.4 <2 <.2 <1 <.51 <.06 115.0 100.5 96.6 324632097270901 OF4 Flume 11/16/2004 <.06 <.16 <.2 <.8 <4 <.4 <2 <1.0 <.12 112.8 98.0 94.8 324632097270901 OF4 Flume 12/06/2004 <.03 <.08 <.1 <.4 <2 <.2 <1 <.51 <.06 112.8 100.9 97.1 08045359 OF4 10/22/2004 <.03 <.08 <.1 <.4 <2 <.2 <1 <.51 <.06 109.6 94.4 92.1 08045359 OF4 11/16/2004 <.06 <.16 <.2 <.8 <4 <.4 <2 <1.0 <.12 108.6 95.4 94.3 08045359 OF4 12/06/2004 <.03 <.08 <.1 <.4 <2 <.2 <1 <.51 <.06 113.4 100.5 99.6 324638097270901 OF5 10/22/2004 <.03 <.08 <.1 <.4 E1.8 <.2 <1 <.51 E.05 113.8 97.8 96.6 Quality control samples 08045359 OF4 - Field blank 10/27/2004 <.03 <.08 <.1 <.4 <2 <.2 <1 <.51 <.06 109.6 97.7 95.5 - - Laboratory blank 1 - - <.03 <.08 <.1 <.4 <2 <.2 <1 <.51 <.06 113.3 98.3 94.9 - - Laboratory spike 1, in percent recovery - - 97.4 103.5 100.3 98.4 109.7 95.3 102.8 93.5 101.4 105.3 100.1 99.1 - - Laboratory blank 2 - - <.03 <.08 <.1 <.4 <2 <.2 <1 <.51 <.06 116.9 100.8 100.0 - - Laboratory spike 2, in percent recovery - - 92.3 89.9 91.4 101.3 105.2 88.9 99.3 93.3 91.3 98.4 99.0 97.5
Appendix 5 59

Appendix 5

Appendix 5. Major and trace element concentrations in lake-bottom sediment samples from sites in Woods Inlet of Lake Worth, Fort 

Worth, Texas, 2006.

[In micrograms per gram except as noted. USGS, U.S. Geological Survey; ID, identifier; cm, centimeter; <, less than; - -, not applicable or not available; %, 

percent]

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date

Organic 

carbon, 

percent

Total 

carbon, 

percent

Inorganic 

carbon, 

percent

Aluminum Calcium Iron Potassium

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 8/28/2006 1.5 5.3 3.8 30,500 147,000 13,700 6,890

324646097271601 WWD.B7 0-1 .5 Lake bottom 8/28/2006 1.9 5.7 3.8 36,100 143,000 16,100 7,260

324652097271601 WWD.B8 0-1 .5 Lake bottom 8/28/2006 1.6 5.9 4.3 41,800 163,000 17,900 7,870

Texas National Guard arm

324649097271901 WWD.B5 0-1 .5 Lake bottom 8/28/2006 .8 1.9 1.1 15,200 40,900 5,960 4,720

Gruggs arm

324658097273001 WWD.B2 0-1 .5 Lake bottom 8/28/2006 1.2 2.8 1.6 24,000 59,900 9,540 6,830

324656097272301 WWD.B3 0-1 .5 Lake bottom 8/28/2006 2.5 5.7 3.2 47,000 124,000 20,600 9,340

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 8/28/2006 2.3 5.9 3.6 50,900 133,000 22,400 9,410

- - Detection limits - - - - - - - - - - - - <50 <100 <50 <20

Sediment quality guidelines

- - TEC1 - - - - - - - - - - - - - - - - - - - -

- - PEC1 - - - - - - - - - - - - - - - - - - - -

Quality control samples

- - Blank 1 - - - - - - - - - - - - <50 <100 <50 <20

- - Blank 2 - - - - - - - - - - - - <50 <100 <50 <20

- - Blank 3 - - - - - - - - - - - - <50 <100 <50 <20

Standard reference materials

- - MAG-1 laboratory - - - - - - - - - - - - 90,400 10,500 50,300 31,500

- - MAG-1 published2 - - - - - - - - - - - - 86,660 9,790 47,600 29,500

- - Percent recovery - - - - - - - - - - - - 104% 107% 106% 107%

- - NIST 8704 laboratory - - - - - - - - - - - - 65,100 27,400 41,800 20,900

- - NIST 8704 published - - - - - - - - - - - - 61,000 26,410 39,700 20,010

- - Percent recovery - - - - - - - - - - - - 107% 104% 105% 104%

- - SCO-1 laboratory - - - - - - - - - - - - 75,400 20,100 36,700 23,300

- - SCO-1 published2 - - - - - - - - - - - - 72,370 18,700 35,900 23,000

- - Percent recovery - - - - - - - - - - - - 104% 107% 102% 101%

- - GSD-8 laboratory - - - - - - - - - - - - 43,300 1,580 15,600 23,700

- - GSD-8 published2 - - - - - - - - - - - - 40,800 1,790 15,380 23,500

- - Percent recovery - - - - - - - - - - - - 106% 88% 101% 101%

- - NIST 2709 laboratory - - - - - - - - - - - - 75,100 19,800 35,700 20,400

- - NIST 2709 published - - - - - - - - - - - - 75,000 18,900 35,000 20,300

- - Percent recovery - - - - - - - - - - - - 100% 105% 102% 100%

- - NIST 2711 laboratory - - - - - - - - - - - - 74,500 30,400 30,300 26,400

- - NIST 2711 published - - - - - - - - - - - - 65,300 28,800 28,900 24,500

- - Percent recovery - - - - - - - - - - - - 114% 106% 105% 108%

- - GSD-5 laboratory - - - - - - - - - - - - 85,300 41,400 43,400 19,000

- - GSD-5 published2 - - - - - - - - - - - - 81,300 38,200 41,000 17,400

- - Percent recovery - - - - - - - - - - - - 105% 108% 106% 109%

- - GSD-3 laboratory - - - - - - - - - - - - 68,400 1,460 48,100 21,100

- - GSD-3 published2 - - - - - - - - - - - - 63,700 1,570 45,500 20,400

- - Percent recovery - - - - - - - - - - - - 107% 93% 106% 103%

Footnotes at end of table.
60 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 5. Major and trace element concentrations in lake-bottom sediment samples from sites in Woods Inlet of Lake Worth, Fort 

Worth, Texas, 2006—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date Magnesium Sodium Phosphorus Titanium Arsenic Barium Beryllium

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 8/28/2006 1.5 1,540 345 1,780 5.6 198 0.97

324646097271601 WWD.B7 0-1 .5 Lake bottom 8/28/2006 1.9 1,470 408 1,960 6.3 203 1.1

324652097271601 WWD.B8 0-1 .5 Lake bottom 8/28/2006 1.6 1,460 446 2,040 7.3 225 1.2

Texas National Guard arm

324649097271901 WWD.B5 0-1 .5 Lake bottom 8/28/2006 .8 1,390 146 1,710 3.4 176 .48

Gruggs arm

324658097273001 WWD.B2 0-1 .5 Lake bottom 8/28/2006 1.2 2,150 262 1,790 3.6 210 .71

324656097272301 WWD.B3 0-1 .5 Lake bottom 8/28/2006 2.5 1,640 560 2,360 7.4 252 1.4

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 8/28/2006 2.3 1,370 592 2,370 8.5 261 1.5

- - Detection limits - - - - - - <6 <20 <5 <40 <1 <.2 <.03

Sediment quality guidelines

- - TEC1 - - - - - - - - - - - - - - 9.79 - - - -

- - PEC1 - - - - - - - - - - - - - - 33 - - - -

Quality control samples

- - Blank 1 - - - - - - - - <20 <5 <40 <1 <.2 <.03

- - Blank 2 - - - - - - - - <20 <5 <40 <1 <.2 <.03

- - Blank 3 - - - - - - - - <20 <5 <40 <1 <.2 <.03

Standard reference materials

- - MAG-1 laboratory - - - - - - - - 29,800 775 4,130 10.1 500 3.1 

- - MAG-1 published2 - - - - - - - - 28,400 711 4,500 9.2 479 3.20 

- - Percent recovery - - - - - - - - 105% 109% 92% 110% 104% 97%

- - NIST 8704 laboratory - - - - - - - - 6,170 1,060 3,420 18.2 437 1.9 

- - NIST 8704 published - - - - - - - - 5,530 - - 4,570 - - 413 - -

- - Percent recovery - - - - - - - - 112% - - 75% - - 106% - -

- - SCO-1 laboratory - - - - - - - - 7,220 977 3,280 12.9 601 1.9 

- - SCO-1 published2 - - - - - - - - 6,670 899 3,760 12.4 570 1.84

- - Percent recovery - - - - - - - - 108% 109% 87% 104% 105% 103%

- - GSD-8 laboratory - - - - - - - - 3,280 130 3,300 2.6 453 2.0 

- - GSD-8 published2 - - - - - - - - 3,490 130 3,660 2.4 480 2.00 

- - Percent recovery - - - - - - - - 94% 100% 90% 108% 94% 100%

- - NIST 2709 laboratory - - - - - - - - 11,800 666 3,330 18.4 973 4.2 

- - NIST 2709 published - - - - - - - - 11,600 620 3,420 17.7 968 - -

- - Percent recovery - - - - - - - - 102% 107% 97% 104% 101% - -

- - NIST 2711 laboratory - - - - - - - - 13,200 950 3,000 108 772 2.5 

- - NIST 2711 published - - - - - - - - 11,400 860 3,060 105.0 726 - -

- - Percent recovery - - - - - - - - 116% 110% 98% 103% 106% - -

- - GSD-5 laboratory - - - - - - - - 2,700 634 4,800 80.7 457 2.4 

- - GSD-5 published2 - - - - - - - - 2,970 610 5,400 75.0 440 2.30 

- - Percent recovery - - - - - - - - 91% 104% 89% 108% 104% 104%

- - GSD-3 laboratory - - - - - - - - 2,210 653 5,250 19.2 598 1.4 

- - GSD-3 published2 - - - - - - - - 2,370 610 6,360 17.6 615 1.50 

- - Percent recovery - - - - - - - - 93% 107% 83% 109% 97% 93%

Footnotes at end of table.
Appendix 5 61

Appendix 5. Major and trace element concentrations in lake-bottom sediment samples from sites in Woods Inlet of Lake Worth, Fort 

Worth, Texas, 2006—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date Cadmium Cobalt Chromium Copper Mercury Lithium Manganese

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 8/28/2006 0.75 3.9 39.7 16.5 0.05 20.2 354

324646097271601 WWD.B7 0-1 .5 Lake bottom 8/28/2006 1.1 4.7 51.4 21.6 .06 23.3 392

324652097271601 WWD.B8 0-1 .5 Lake bottom 8/28/2006 .71 5.3 45.6 18.0 .05 25.8 507

Texas National Guard arm

324649097271901 WWD.B5 0-1 .5 Lake bottom 8/28/2006 .12 2.1 22.4 10.3 .15 11.4 182

Gruggs arm

324658097273001 WWD.B2 0-1 .5 Lake bottom 8/28/2006 .25 3.7 29.7 12.9 .02 15.6 272

324656097272301 WWD.B3 0-1 .5 Lake bottom 8/28/2006 .51 6.8 46.0 19.5 .04 28.4 653

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 8/28/2006 .74 6.6 58.5 21.8 .05 31.1 862

- - Detection limits - - - - - - <.007 <.03 <.5 <2 <.02 <.3 <.7

Sediment quality guidelines

- - TEC1 - - - - - - .99 - - 43.4 31.6 .18 - - - -

- - PEC1 - - - - - - 4.98 - - 111 149 1.06 - - - -

Quality control samples

- - Blank 1 - - - - - - <.007 <.03 <.5 <2 - - .6 <.7

- - Blank 2 - - - - - - <.007 <.03 <.5 <2 - - .3 <.7

- - Blank 3 - - - - - - <.007 <.03 <.5 <2 - - 1.2 <.7

Standard reference materials

- - MAG-1 laboratory - - - - - - .21 22.6 113 36.3 - - 77.9 776 

- - MAG-1 published2 - - - - - - .20 20.4 97 30.0 - - 79.0 760

- - Percent recovery - - - - - - 104% 111% 116% 121% - - 99% 102%

- - NIST 8704 laboratory - - - - - - 3.2 13.9 134 90.1 - - 47.3 583 

- - NIST 8704 published - - - - - - 2.94 13.6 122 - - - - - - 544

- - Percent recovery - - - - - - 109% 102% 110% - - - - - - 107%

- - SCO-1 laboratory - - - - - - .16 11.4 72.8 29.8 - - 44.9 395 

- - SCO-1 published2 - - - - - - .14 10.5 68.0 28.7 - - 45.0 410

- - Percent recovery - - - - - - 114% 109% 107% 104% - - 100% 96%

- - GSD-8 laboratory - - - - - - .02 3.4 5.0 5.1 - - 14.0 344 

- - GSD-8 published2 - - - - - - .08 3.6 7.60 4.1 - - 13.2 310

- - Percent recovery - - - - - - 25% 94% 66% 124% - - 106% 111%

- - NIST 2709 laboratory - - - - - - .41 13.4 125 36.1 - - 53.6 555 

- - NIST 2709 published - - - - - - .38 13.4 130 34.6 - - - - 538

- - Percent recovery - - - - - - 108% 100% 96% 104% - - - - 103%

- - NIST 2711 laboratory - - - - - - 42.6 10.4 49.4 115 - - 29.7 708 

- - NIST 2711 published - - - - - - 41.70 10.0 47 114.0 - - - - 638

- - Percent recovery - - - - - - 102% 104% 105% 101% - - - - 111%

- - GSD-5 laboratory - - - - - - .90 20.0 81.8 143 - - 46.6 1230 

- - GSD-5 published2 - - - - - - .82 18.9 70.00 137.0 - - 45.0 1160

- - Percent recovery - - - - - - 110% 106% 117% 104% - - 104% 106%

- - GSD-3 laboratory - - - - - - .25 11.6 82.9 189 - - 35.3 435 

- - GSD-3 published2 - - - - - - .10 11.7 87.00 177.0 - - 33.0 390

- - Percent recovery - - - - - - 250% 99% 95% 107% - - 107% 112%

Footnotes at end of table.
62 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 5. Major and trace element concentrations in lake-bottom sediment samples from sites in Woods Inlet of Lake Worth, Fort 

Worth, Texas, 2006—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date Nickel Lead Scandium Strontium Vanadium Zinc Gallium Rubidium

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 8/28/2006 13.2 26.8 5.3 205 40.6 82.3 7.0 38.7

324646097271601 WWD.B7 0-1 .5 Lake bottom 8/28/2006 14.7 34.5 6.1 209 49.0 108 8.3 44.1

324652097271601 WWD.B8 0-1 .5 Lake bottom 8/28/2006 15.6 29.4 6.8 228 55.0 85.8 9.3 49.3

Texas National Guard arm

324649097271901 WWD.B5 0-1 .5 Lake bottom 8/28/2006 5.2 11.8 3.1 80.7 19.4 24.1 3.3 20.9

Gruggs arm

324658097273001 WWD.B2 0-1 .5 Lake bottom 8/28/2006 8.9 17.9 3.9 115 28.4 40.8 5.2 32.3

324656097272301 WWD.B3 0-1 .5 Lake bottom 8/28/2006 17.7 28.0 7.8 212 64.0 76.5 10.6 60.1

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 8/28/2006 19.0 27.6 8.3 217 67.1 82.2 11.7 62.8

- - Detection limits - - - - - - <.3 <.4 <.04 <.8 <.2 <3 <.02 <.01

Sediment quality guidelines

- - TEC1 - - - - - - 22.7 35.8 - - - - - - 121 - - - -

- - PEC1 - - - - - - 48.6 128 - - - - - - 459 - - - -

Quality control samples

- - Blank 1 - - - - - - <.3 <.4 <.04 <.8 <.2 <3 <.02 <.01

- - Blank 2 - - - - - - <.3 <.4 <.04 <.8 <.2 <3 <.02 <.01

- - Blank 3 - - - - - - <.3 <.4 <.04 <.8 <.2 <3 <.02 <.01

Standard reference materials

- - MAG-1 laboratory - - - - - - 50.2 26.7 19.0 148 146 141 22.8 150 

- - MAG-1 published2 - - - - - - 53.0 24.0 17.2 146 140 130 20.4 149 

- - Percent recovery - - - - - - 95% 111% 110% 101% 104% 108% 112% 101%

- - NIST 8704 laboratory - - - - - - 43.2 144 12.8 137 94.6 426 15.6 103 

- - NIST 8704 published - - - - - - 42.9 150.0 11.3 - - 94.6 408 - - - -

- - Percent recovery - - - - - - 101% 96% 114% - - 100% 104% - - - -

- - SCO-1 laboratory - - - - - - 26.6 30.0 12.8 171 134 108 16.8 112 

- - SCO-1 published2 - - - - - - 27.0 31.0 10.8 174 131 103 15.0 112 

- - Percent recovery - - - - - - 99% 97% 119% 98% 102% 105% 112% 100%

- - GSD-8 laboratory - - - - - - 1.5 20.5 5.4 48.0 23.6 45.9 10.2 127 

- - GSD-8 published2 - - - - - - 2.7 21.0 5.7 52.0 26 43.0 10.8 132 

- - Percent recovery - - - - - - 56% 98% 95% 92% 91% 107% 94% 96%

- - NIST 2709 laboratory - - - - - - 80.8 18.5 12.9 234 115 108 16.3 92.5 

- - NIST 2709 published - - - - - - 88.0 18.9 12.0 231 112.0 106 14.0 96 

- - Percent recovery - - - - - - 92% 98% 108% 101% 103% 102% 116% 96%

- - NIST 2711 laboratory - - - - - - 20.1 1,220 10.6 258 89.5 363 16.6 120 

- - NIST 2711 published - - - - - - 20.6 1,162 9 245 82 350 15.0 110 

- - Percent recovery - - - - - - 98% 105% 118% 105% 110% 104% 111% 109%

- - GSD-5 laboratory - - - - - - 36.4 111 15.7 214 112 267 19.9 124 

- - GSD-5 published2 - - - - - - 34.0 112.0 14.5 204.0 109 243.0 20.3 118 

- - Percent recovery - - - - - - 107% 99% 108% 105% 103% 110% 98% 105%

- - GSD-3 laboratory - - - - - - 26.2 41.4 15.0 94.5 122 58.0 15.1 74.7 

- - GSD-3 published2 - - - - - - 25.6 40.0 14.3 90.0 120 52.0 15.9 79 

- - Percent recovery - - - - - - 102% 104% 105% 105% 102% 112% 95% 95%

Footnotes at end of table.
Appendix 5 63

Appendix 5. Major and trace element concentrations in lake-bottom sediment samples from sites in Woods Inlet of Lake Worth, Fort 

Worth, Texas, 2006—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date Yttrium Niobium Molybdenum Silver Antimony Cesium Lanthanum

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 8/28/2006 16.3 4.2 0.95 <1 0.57 2.3 24.2

324646097271601 WWD.B7 0-1 .5 Lake bottom 8/28/2006 17.0 4.4 1.2 <1 .69 2.7 24.1

324652097271601 WWD.B8 0-1 .5 Lake bottom 8/28/2006 17.7 8.2 1.0 <1 .61 3.1 25.5

Texas National Guard arm

324649097271901 WWD.B5 0-1 .5 Lake bottom 8/28/2006 16.2 3.2 .40 <1 .30 1.1 19.2

Gruggs arm

324658097273001 WWD.B2 0-1 .5 Lake bottom 8/28/2006 15.2 4.1 .41 <1 .34 1.7 24.6

324656097272301 WWD.B3 0-1 .5 Lake bottom 8/28/2006 19.5 7.2 .80 <1 .62 3.6 28.9

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 8/28/2006 20.2 8.7 .92 <1 .72 3.9 28.4

- - Detection limits - - - - - - <.05 <.1 <.05 <1 <.04 <.003 <.05

Sediment quality guidelines

- - TEC1 - - - - - - - - - - - - - - - - - - - -

- - PEC1 - - - - - - - - - - - - - - - - - - - -

Quality control samples

- - Blank 1 - - - - - - <.05 <.1 <.05 <1 <.04 <.003 <.05

- - Blank 2 - - - - - - <.05 <.1 <.05 <1 <.04 <.003 <.05

- - Blank 3 - - - - - - <.05 <.1 <.05 <1 <.04 <.003 <.05

Standard reference materials

- - MAG-1 laboratory - - - - - - 24.7 20 1.1 < 1 .91 8.5 46.6 

- - MAG-1 published2 - - - - - - 28.0 12.0 1.60 .08 .96 8.60 43.0 

- - Percent recovery - - - - - - 88% 167% 69% - - 95% 99% 108%

- - NIST 8704 laboratory - - - - - - 24.7 13 3.6 < 1 2.8 5.9 32.3 

- - NIST 8704 published - - - - - - - - - - - - - - 3.07 5.83 - -

- - Percent recovery - - - - - - - - - - - - - - 91% 101% - -

- - SCO-1 laboratory - - - - - - 21.6 14 1.2 < 1 2.4 7.6 31.1 

- - SCO-1 published2 - - - - - - 26.0 11.0 1.37 .134 2.50 7.80 29.5 

- - Percent recovery - - - - - - 83% 127% 88% - - 96% 97% 105%

- - GSD-8 laboratory - - - - - - 15.0 37 .50 < 1 0.32 3.2 28.2 

- - GSD-8 published2 - - - - - - 18.0 35.0 .54 - - 0.24 3.60 30.0 

- - Percent recovery - - - - - - 83% 106% 93% - - 133% 89% 94%

- - NIST 2709 laboratory - - - - - - 17.4 12 2.0 < 1 6.3 5.4 22.5 

- - NIST 2709 published - - - - - - 18.0 - - 2 - - 7.90 5.30 23.0 

- - Percent recovery - - - - - - 97% - - 100% - - 80% 102% 98%

- - NIST 2711 laboratory - - - - - - 31.0 26 1.6 4.7 18.8 6.5 39.6 

- - NIST 2711 published - - - - - - 25.0 - - 1.60 4.63 19.40 6.10 40.0 

- - Percent recovery - - - - - - 124% - - 100% 102% 97% 107% 99%

- - GSD-5 laboratory - - - - - - 21.3 20 1.1 < 1 4.0 8.9 43.1 

- - GSD-5 published2 - - - - - - 26.0 19.0 1.20 .36 3.90 9.40 46.0 

- - Percent recovery - - - - - - 82% 105% 92% - - 103% 95% 94%

- - GSD-3 laboratory - - - - - - 17.0 14 92.9 < 1 6.5 7.2 37.2 

- - GSD-3 published2 - - - - - - 22.0 16.0 92.00 .59 5.40 7.80 39.0 

- - Percent recovery - - - - - - 77% 88% 101% - - 120% 92% 95%

Footnotes at end of table.
64 Degree of Contamination and Sources of Polychlorinated Biphenyls, Lake Worth, Fort Worth, Texas

Appendix 5. Major and trace element concentrations in lake-bottom sediment samples from sites in Woods Inlet of Lake Worth, Fort 

Worth, Texas, 2006—Continued.

USGS 

station ID Sample ID

Middepth 

(cm)

Sample 

type

Sample 

date Cerium Thallium Bismuth Thorium Uranium

Meandering Road Creek arm

324643097271501 WWD.B6 0-1 0.5 Lake bottom 8/28/2006 50.2 0.30 1.10 7.80 2.40

324646097271601 WWD.B7 0-1 .5 Lake bottom 8/28/2006 49.6 .34 1.25 7.71 2.44

324652097271601 WWD.B8 0-1 .5 Lake bottom 8/28/2006 51.4 .38 .44 8.23 2.50

Texas National Guard arm

324649097271901 WWD.B5 0-1 .5 Lake bottom 8/28/2006 38.1 .18 .12 7.21 2.72

Gruggs arm

324658097273001 WWD.B2 0-1 .5 Lake bottom 8/28/2006 50.5 .27 .10 7.94 2.08

324656097272301 WWD.B3 0-1 .5 Lake bottom 8/28/2006 58.4 .46 .23 8.68 2.51

Middle Woods Inlet

324657097271901 WWD.1 0-1 .5 Lake bottom 8/28/2006 57.4 .47 .66 8.87 2.54

- - Detection limits - - - - - - <.1 <.08 <.06 <.1 <.02

Sediment quality guidelines

- - TEC1 - - - - - - - - - - - - - - - -

- - PEC1 - - - - - - - - - - - - - - - -

Quality control samples

- - Blank 1 - - - - - - <.1 <.08 <.06 <.1 <.02

- - Blank 2 - - - - - - <.1 <.08 <.06 <.1 <.02

- - Blank 3 - - - - - - <.1 <.08 <.06 <.1 <.02

Standard reference materials

- - MAG-1 laboratory - - - - - - 88.7 .78 .34 12.4 2.64 

- - MAG-1 published2 - - - - - - 88.0 .59 .34 11.9 2.70 

- - Percent recovery - - - - - - 101% 132% 100% 104% 98%

- - NIST 8704 laboratory - - - - - - 64.3 1.12 .60 8.79 2.80 

- - NIST 8704 published - - - - - - 66.5 - - - - 9.1 3.09 

- - Percent recovery - - - - - - 97% - - - - 97% 91%

- - SCO-1 laboratory - - - - - - 58.6 .69 0.35 9.38 2.77 

- - SCO-1 published2 - - - - - - 62.0 .72 0.37 9.7 3.00 

- - Percent recovery - - - - - - 95% 96% 95% 97% 92%

- - GSD-8 laboratory - - - - - - 56.9 .75 .18 13.7 3.03 

- - GSD-8 published2 - - - - - - 54.0 .78 .19 13.4 3.00 

- - Percent recovery - - - - - - 105% 96% 95% 102% 101%

- - NIST 2709 laboratory - - - - - - 42.6 .65 .26 10.9 2.71 

- - NIST 2709 published - - - - - - 42.0 .74 - - 11.0 3.00 

- - Percent recovery - - - - - - 101% 88% - - 99% 90%

- - NIST 2711 laboratory - - - - - - 74.7 2.46 2.31 14.5 2.60 

- - NIST 2711 published - - - - - - 69.0 2.47 - - 14.0 2.60 

- - Percent recovery - - - - - - 108% 100% - - 104% 100%

- - GSD-5 laboratory - - - - - - 93.5 1.21 2.35 15.1 2.50 

- - GSD-5 published2 - - - - - - 89.0 1.16 2.40 15.2 2.60 

- - Percent recovery - - - - - - 105% 104% 98% 99% 96%

- - GSD-3 laboratory - - - - - - 65.7 .49 .80 9.53 1.75 

- - GSD-3 published2 - - - - - - 64.0 .58 .79 9.2 1.86 

- - Percent recovery - - - - - - 103% 84% 101% 104% 94%

1

 TEC, Threshold effects concentration; PEC, Probable effects concentration (MacDonald and others, 2000).

2

 Potts and others, 1992.
Publishing support provided by

Lafayette Publishing Service Center

Information regarding water resources in Texas is available at 

http://tx.usgs.gov/