DRAFT 

I SDMS DocID 456775 

Swperfund Records Center 

SITE: O'Czmn^^l 

OTHER:. 

DRAFT 

2004 RIGGS BROOK 

SEDIMENT MONITORING REPORT 

O'CONNOR COMPANY SUPERFUND SITE 

AUGUSTA, MAINE 

DECEMBER 2004 
I 

TABLE OF CONTENTS 
DRAFT 

2004 RIGGS BROOK SEDIMENT MONITORING REPORT 

TABLE OF CONTENTS 

SECTION TITLE PAGE NO. 

EXECUTIVE SUMMARY 1 

1. INTRODUCTION 4 

2. SEDIMENT/WETLAND SOIL SAMPLING 5 

2.1 General Weather and Stream Conditions 5 

2.2 Sediment/Wetland Soil Sample Locations 6 

2.3 Sediment/Wetland Soil Sample Collection Methods 10 

2.4 Composition of Sediment/Wetland Soils ! 11 

3. SEDIMENT/WETLAND SOIL ANALYTICAL METHODS AND RESULTS 12 

3.1 Sediment/Wetland Soil Analytical Methods 12 

3.2 Sediment/Wetland Soil Monitoring Results 12 

3.3 Sediment/Wetland Soil Quality Control Results 14 

3.3.1 Evaluation of Quality Control Elements 14 

3.3.1.1 Data Completeness 14 

3.3.1.2 Method Blanks 14 

3.3.1.3 Surrogate Recoveries.... 15 

3.3.1.4 Equipment and Field Blanks 15 

3.3.1.5 Calibration Results 16 

3.3.1.6 Matrix Spike Samples 16 

3.3.1.7 Laboratory Control Samples 17 

3.3.1.8 Field Duplicate Samples 17 

3.3.1.9 Sample Quantification 18 

3.3.2 Summary of Quality Control Sample Results 18 

3.3.3 Evaluation of PARCC Parameters 19 

3.3.3.1 Precision 19 

3.3.3.2 Accuracy 20 

3.3.3.3 Representativeness 20 

3.3.3.4 Completeness 20 

3.3.3.5 Comparability 20 

4. SUMMARY OF 2004 SEDIMENT/WETLAND SOIL ANALYTICAL RESULTS 22 

4.1 Comparison of 2004 Sediment/Wetland Soil Analytical Results to Target Level 22 

4.2 Comparison of 2004 Sediment/Wetland Soil Analytical Results to Previous Sediment/Wetland 

Soil Data 22 

4.3 Mann-Kendall Statistical Trend Test 22 

5. CONCLUSIONS AND RECOMMENDATIONS 26 

WOODARD&CURRAN (212004.01) TOC - i 12/02/2004 

DRAFT SED RPT 2004 
2004 RIGGS BROOK SEDIMENT MONITORING REPORT 

TABLE OF CONTENTS 

LIST OF FIGURES 

FIGURE TITLE 

DRAFT 

PAGE NO. 

Figure 1: Total PCBs in Riggs Brook Sediments/Wetland Soils-September 2003. 

Figure 2: Total PCBs in Riggs Brook Sediments/Wetland Soils-Upstream & Downstream 

September 2003 

Figure 3: Supplemental Samples, Total PCBs in Riggs Brook Wetland Soils/SedimentsSeptember 2003 9 

LIST OF TABLES 

TABLE TITLE PAGE NO. 

Table 1 

Table 2 

Table 3 

Table 4 

Concentrations of PCBs Exceeding the Target Level of 5 mg/kg 2 

Monthly Rainfall 1996 - 2004 Augusta, ME 5 

2003 Riggs Brook Sediment/Wetland Soil Monitoring Sample Results 13 

Comparison of 2004 Sediment/Wetland Soil Monitoring Results to Historical Results 24 

LIST OF ACRONYMS AND ABBREVIATIONS 

LIST OF REFERENCES 

APPENDICES 

Appendix A: Sediment/Wetland Soil Sampling Survey Data 

Appendix B: 1987 Remedial Investigation Riggs Brook Sediment and Biota Data 

Appendix C: Mann Kendall Trend Analysis Sediment Sample Results 1996 - 2004 

WOODARD & CURRAN (212004.01) 

DRAFT SED RPT 2004 

TOC - ii 12/02/2004 
I 

EXECUTIVE SUMMARY 
DRAFT 

EXECUTIVE SUMMARY 

In accordance with the Riggs Brook Sediment and Biota Sampling and Analysis Plan (SAP) (W&C, 

1997), sediment sampling at Riggs Brook was completed on September 13 and 14, 2004. 

Thirty-six sediment/wetland soil-monitoring samples (excluding quality control samples such as 

duplicates) were collected during the 2004 sampling event. Samples were collected at all of the original 

twenty-four locations proposed in the SAP (8001 to 8023), and at locations 8039 and 3018, which were 

added to the program in 1998. 

In conjunction with a supplemental sampling grid that was sampled in 2000, ten additional sediment 

samples were collected in an area between the former Source Control Area of the O'Connor Company 

Superfund Site (the Site) and Riggs Brook. Samples 9B000, 9C000, 9C025, 9C050, 9C075, 9C100 and 

9C125 were sampled in 2000. Locations 9A925, 9B925 and 9C925, east of the former 2000 

supplemental grid, were added in 2001 and were sampled again this year. The purpose of collecting these 

additional samples was to confirm detections of target PCB Arochlors reported for locations on the 

supplemental grid in 2000 and to establish if there are any trends with respect to sediment sample 

concentrations of PCBs through time. 

Sediment samples were collected using a 4-foot long, 1.5-inch diameter acetate macrocore liner at 

submerged locations. At dry locations, a core-sampling device was manually pushed approximately six 

inches into the ground to collect wetland soils. The sediments and wetland soils collected in 2004 

primarily consisted of clay. The top portion of wetland soil samples often contained roots and grass. The 

soil was shaken from the roots and included in the sample. However, the roots and grass were discarded 

and were not included as part of the sample matrix. Sediment and wetland soil samples were thoroughly 

homogenized in stainless steel bowls prior to placement into sample jars. 

PCB concentrations for all sediment/wetland soil samples collected during the 2004 program were 

compared to a target level of 5 mg/kg. Total PCB concentrations were below this target level in 34 of the 

36 (94%) samples. PCBs exceeded the target level at two sample locations (3018 at 18 mg/kg and 8004 

at 8.2 mg/kg). The average concentration of total PCBs for the thirty-six samples (using detection limit 

values for non-detect samples) was 1 mg/kg. Total PCBs ranged from non-detect to 18 mg/kg. 

The 2004-sediment/wetland soil results were compared against historical results from 1987 and 1996 

through 2003 with the following observations. 

WOODARD&CURRAN (212004.01) Pagel 12/02/2004 

DRAFT SED RPT 2004 
DRAFT 

Concentrations of total PCBs at sample points upstream of the Site have been below detection limits 

every year in which samples have been collected and analyzed. 

For the area of Riggs Brook adjacent to the Site, PCBs were not detected above the target level of 5 

mg/kg at any sample locations in 1987, 1996 and 2003. From 1997 to 2002 and in 2004, there were 

sporadic exceedances of the target level at one or two locations per year, as shown in Table 1 below. 

TABLE 1: CONCENTRATIONS OF PCBs EXCEEDING THE TARGET LEVEL OF 5 MG/KG 

ll%:catioii 

W99'% 

::.vE,@Bs;i .^'BCB^y 

i(mmg)i m m iims/Mm 

8004 29 8.2 

8013 5.7 J 

3018 6.4 6.1 5.63 J 

8006 15.9 14 10.4 

Notes: 

Indicates that the concentration of PCBs was below the target level of 5 mg/kg 

At the request of the USEPA, fifty-one sediment sample points, located along a grid between the Site and 

Riggs Brook, were added to the sediment-sampling program in 2000. All samples collected at points 

from this grid had concentrations of total PCBs below the target level of 5 mg/kg except 9B000, 9C050, 

9C075 and 9C125. Each of these points, plus several others that had not exceeded the target level, were 

re-sampled in 2001. Three additional points, 9A925, 9B925 and 9C925, were also sampled in 2001. The 

same 10 locations on the supplemental grid that were sampled in 2001, 2002 and 2003 were re-sampled in 

2004. PCBs were detected at all 10 locations and concentrations ranged from 0.058 mg/kg at 9C025 to 

2.1 mg/kg at 9C100. Results for other 2004 samples were similar to concentrations reported previously. 

As in 2001-2003, in 2004, none of the samples collected at these 10 additional locations exceeded the 

target level. 

Downstream of the Site at sample locations 8018 through 8023, detected concentrations of total PCBs 

have historically been below the 5 mg/kg target level. Trace concentrations of PCBs have been 

sporadically reported for one or more of these locations throughout the years. 

WOODARD & CURRAN (212004.01) 

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Page 2 12/02/2004 
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In accordance with the SAP, a Mann-Kendall statistical trend analysis was used to determine if 

concentrations of total PCBs in sediment samples collected between 1996 and 2004 indicate a trend. The 

results of this test do not indicate any significant trends relative to increases or decreases in PCB 

concentrations at 33 of the 36 samples collected. Downward trends were indicated at two sample 

locations (8006 and 9C075). An upward trend was indicated at sample location 9A925. However, 

concentrations of PCBs at 9A925 have been less than 1 mg/kg for the four years of data provided, and 

have been essentially the same from 2002 to 2004. 

Two sediment sampling locations exceeded the target level for PCBs of 5 mg/kg this year, 3018 (18 

mg/kg) and 8004 (8.2 mg/kg). The sporadic exceedances of the target level of 5 mg/kg may be due to the 

sorptive nature of PCBs. PCBs are more likely to sorb to soil/sediment with a high organic content. Due 

to the heterogeneous nature of sediments, PCBs could sporadically be detected at concentrations above 

the target level. The physical transport of PCBs on soil particles with water runoff can also result in 

redistribution of concentrations to areas where water collects or pools. However sediment sample 

concentrations do not indicate that PCBs have migrated into Riggs Brook since the completion of the 

Source Control Remedial Action in 1997. Based on past data, PCB concentrations that sporadically 

exceed the target level have not been shown to be related to concentrations of PCBs detected in biota 

collected from Riggs Brook. In fact, based on biota sample results for 1987, 1997 and 2000, 

concentrations of PCBs have all been below the target level of 2 mg/kg and have generally decreased 

from 1987 to 2000. Therefore, based on these conclusions and the fact that the Marm-Kendall Trend Test 

results for 2004 sediment sample results do not indicate any significant trends, no remedial action is 

recommended at this time. 

WOODARD & CURRAN (212004.01) Page 3 12/02/2004 

DRAFT SED RPT 2004 
SECTION 1 
DRAFT 

I. INTRODUCTION 

This document constitutes the 2004 Riggs Brook Sediment Monitoring Report (Report) for the O'Connor 

Company Superfund Site (the Site) in Augusta, Maine. In April 1996, the U.S. Environmental Protection 

Agency (USEPA) designated Riggs Brook as Operable Unit 3 (OU-3) of the Site. This Report has been 

prepared by Woodard & Curran Inc. (W&C), the Supervising Contractor, on behalf of Central Maine 

Power (CMP), the Settling Defendant in accordance with the Consent Decree in United States of America 

V. Central Maine Power, Civil No. 900302B, entered on September 3, 1991, and the Explanation of 

Significant Differences (ESD), approved and issued by the USEPA on July 11, 1994. 

This Report presents the analytical results of the 2004 sediment sampling activities completed at OU-3 

and provides a comparison to sediment data collected from 1996 through 2004 and to the sediment data 

generated as a part of the Remedial Investigation Report for the Site, Volume I (RI) completed by E.C. 

Jordan in 1987. The 2004 sediment-sampling event was conducted in accordance with the Riggs Brook 

Sediment and Biota Sampling and Analysis Plan (SAP), (W&C, 1997). The 2004 sampling event 

represented the ninth annual sediment-sampling event since remedial action was initiated at the O'Connor 

Site in 1996. 

The data quality objective (DQO) for each sediment-sampling event is to determine if PCB concentrations 

are below 5 mg/kg at all sampling locations. In accordance with the SAP, the analytical results from each 

sampling event will be used to evaluate whether additional sampling is necessary and if further remedial 

action within Riggs Brook is necessary to reduce the potential risk to human health and the environment. 

Section 2 of this report describes general weather and stream conditions during sampling collection, 

sediment sample locations, sample collection methods, and a description of the soil types for the sediment 

samples. Section 3 summarizes analytical results, including associated quality control results for the 

sediment/wetland soil samples. Section 4 presents a comparison of 2004 sediment/wetland soil PCB 

concenfrations to the target level, and to previously collected data. Also included in Section 4 are the 

results of the Mann-Kendall statistical trend analysis. Section 5 provides conclusions of the 2004 

sampling event and recommendations for future actions. 

WOODARD&CURRAN (212004.01) Page 4 12/02/2004 

DRAFT SED RPT 2004 
SECTION 2 
DRAFT 

2. SEDIMENT/WETLAND SOIL SAMPLING 

This section describes the general stream and weather conditions, the sediment/wetland soil sampling 

locations, the collection methods and general sediment composition. 

2.1 GENERAL WEATHER AND STREAM CONDITIONS 

Thirty-six sediment/wetland soil samples were collected in Riggs Brook on September 13 and 14, 2004. 

The weather conditions during sample collection were clear with temperatures around 65 degrees 

Fahrenheit. According to the National Weather Service, rainfall for the Augusta area was below normal 

for June and July, and well above normal for August, 2004. Due to the increased rainfall in August, water 

levels at several sample locations were high compared to the last few years. Table 2 shows monthly 

rainfall in inches for the three months prior to sampling each year, and the rainfall during the month of 

September. 

^Year" 

1996 

1997 

1998 

1999 

2000 

2001 

2002 

2003 

2004 

TABLE 2: MONTHLY RAINFALL 1996 - 2004 AUGUSTA, ME 

..t.^\M,,- i ?^. , :. "i^fpTS^ipitati6n(Indhfes)i'y^.'e'"-> *'-':K- * . •_,!.„ 

? "- V' / ^,^h'^^-%'^^' v*^ ^^« ^ ^ Z ...MoiitK^^''^'-^-''' ' ^ '^--(<««f^ 2 -;. % '|./ ' 

''f^ F"^'June'^ A-, „ 

3.34 

3.64 

10.32 

1.11 

1.79 

4.09 

3.81 

1.51 

2.02 

Ct. ^v'jsiy."^, : . 

8.67 

3.55 

1.3 

1.54 

6.33 

2.12 

2.02 

1.67 

2.48 

' _'., Augu'st' 

1.02 

3.15 

1.51 

2.24 

1.67 

0.32 

1.2 

4.00 

7.04 

.,-.'#September"^^ '"•" 

7.53 

3.25 

1.6 

11.29 

1.64 

3.98 

3.28 

6.21 

2.39 

WOODARD & CURRAN (212004.01) 

DRAFT SED RPT 2004 

Pages 12/02/2004 
DRAFT 

2.2 SEDIMENT/WETLAND SOIL SAMPLE LOCATIONS 

The thirty-six sediment/wetland soil sample locations are illustrated in Figures 1, 2 and 3. Sample 

locations were relocated using a digital geographical positioning system (DGPS). Survey data collected 

for the sample locations is presented in Appendix A. Sample collection began downstream at sediment 

sample location 8023 and progressed to the furthest upstream location at 8002B. As defined in the SAP, 

sediment samples were collected at submerged locations, while wetland soil samples were collected at 

non-submerged locations. 

Downstream of the Site, six sediment samples were collected at intervals of approximately 1200 feet from 

locations 8023 to 8018. The furthest downstream sediment sample location, 8023, is just upstream from 

where Route 105 crosses Riggs Brook (see Figures 1 and 2). 

Fifteen sediment/wetland soil samples were collected on an approximate 100-foot grid in an area of Riggs 

Brook adjacent to the Site. Sample locations within this area include 8003 through 8017. Wetland soil 

samples continue to be collected at sample locations 3018 and 8039 also adjacent to the Site. Initially, 

these locations were mistakenly sampled in 1998. Both locations have been included in the Riggs Brook 

Sediment Sampling Program every year since 1998. 

In conjunction with a supplemental sampling grid that was sampled in 2000, ten additional sediment 

samples were collected in an area between the Site and Riggs Brook. Sample locations 9B000, 9C000, 

9C025, 9C050, 9C075, 9C100 and 9C125 were sampled in 2000. Locations 9A925, 9B925 and 9C925, 

which are east of the 2000 supplemental grid, were added in 2001. The purpose of collecting these 

samples was to monitor detections of target PCB Arochlors reported for the grid locations in 2000. 

Three sediment/wetland soil samples were collected as background samples upstream of Route 17 and the 

Site. In accordance with the SAP, sediment/wetland soil samples were collected at sample location 8001 

approximately 200 feet upstream of Route 17, and at sample location 8002A approximately 300 feet 

upstream of Route 17 within a dense stand of alder trees. A third background sediment sample, 8002B, 

was collected approximately 2100 feet upstream of Route 17, near an abandoned railroad trestle. 

WOODARD&CURRAN (212004.01) Page 6 12/02/2004 

DRAFT SED RPT 2004 
o 

o^n 

o 

o 

lb o 

.01 O o 

O ^ Ji ll 

\ 

' \ 

/ / ' 

li li 

UPLAND 

ii MARSH 

J002A AND 8002B 

JPSTREAM APPROX. 

1300 FT. AND 2100 

5W OF RT. 17 

5EE FIGURE ^ ^ 

it 

RESTORED UPPER LAGOON 

FT. 

ll 

ZSOD. 

8001.2004-

<0.028 ppm 

# ^ 

T 

il 

8003.2004 

<0.025 ppm 

3018.2004 

18 ppm 

RESTORED LOWER LAGOON 

^ G O 

8004.2004 

8.2 ppm 

o 

8007.2004.51 

0.48 J ppm 

8007.2004 

0.48 J ppm 

8009.2004 

0.22 ppm 

o 

8011.2004 

<0.023 ppm 

8005.2004 

0.024 J ppm 

iiji 

il 

ii iiit 

il 

8012.2004 

0.57 J ppm 

8006.2004 

0.59 ppm 

8008.2004 

<0.024 ppm 

G 

'O 

8010.2004 

<0.024 ppm 

LEGEND 

il 

TREE LINE 

BRUSH 

MARSH 

EDGE OF BROOK 

EDGE OF PAVED ROAD 

GRAVEL ROAD 

TREE 

EXISTING BUILDING 

POWER LINE 

SEDIMENT SAMPLE LOCATION 

ppm = PARTS PER MILLION OR MG/KG 

o 

8019.2004 

0.037 J ppm 

3500 FT. TO 

RT. 105 

8017.2004.51 

0.047 J ppm 

8017.2004 

0.067 ppm 

8013.2004 

<0.022 ppm 

8014.2004 

0.43 ppm 

\ 

il 

8015.2004 

<0.021 ppm 

• ^ 

8016.2004 

<0.024 ppm 

THREE ADDITIONAL SEDIMENT SAMPLES 

(8021, 8022 & 8023) WERE TAKEN 

DOWNSTREAM AT DISTANCES OF 

APPROXIMATELY 1200' BETWEEN EACH 

SAMPLE (SEE FIGURE 2) 

-CONFLUENCE OF EAST AND 

WEST BRANCHES OF RIGGS 

BROOK 

NOTES 

• BOUNDARIES OF RESTORED LAGOONS 

ESTIMATED (1/98) BASED ON WETLAND 

RESTORATION PLAN (DRAWING C-12. 100% 

DESIGN, JULY 1996), AND NEW WETLAND 

FINAL TOPOGRAPHY (APPENDIX D DRAFT 

SCRA REPORT, DECEMBER 1997). 

DES.BY: LEM | DR.BY: JBC | CK.BY: RDD 

O'CONNOR COMPANY SUPERFUND SITE 

2004 RIGGS BROOK SEDIMENT 

MONITORING REPORT 

nOURE 1 

TOTAL PCBs IN RIGGS BROOK 

SEDIMENTS/WETLAND SOILS5^FPTFMRFR 700 4 

SCALE: r=200 ' 

DATE: NOVEMBER 2004 21200401-H001-MR 

JOB NO.: 212004.01 

WOODARD&CURRAN 

Engineering • Science • Operations 
., ;/6^^' "L\/' 

ML 1)5/' : t 

2000 

feet 

scale 

2000 4000 

SITE MAP COMPILED FROM U.S.G.S. 

TOPOGRAPHIC QUADRANGLES FOR 

TOGUS POND, MAINE, PHOTOINSPECTED 

1982, AND AUGUSTA, MAINE PHOTOINSPECTED 1980. 

DES.BY: LEM DR.BY: JBC CK.BY: RDD 

0 CONNOR COMPANY SUPERRJND SITE 

2004 RIGGS BROOK SEDIMENT MONITORING 

REPORT 

FIGURE 2 

TOTAL PCBs IN RIGGS BROOK 

SEDIMENTS/WETLAND SOILS 

UPSTREAM AND DOWNSTREAM OF SITE 

SEPTEMBER 2004 

SCALE: 1"=2000' 

DATE: NOVEMBER 2004 

JOB NO.: 212004.01 

SHEET: 21200401-H002-MR 

WOODARD&CURRAN 

Engineering • Science • Operations 
r 

^ ^ -

MARSH GRASS 

v-gV 

PROPERTY LINE & 

SUPERFUND SITE 

BOUNDARY 

ARCH CULVERT 

12'WIDE AT BASE 

INV. EL. 174.86' 

^Sf^ 

14 

/ 

9C025 

+0.49 

40 

>€> 

LEGEND 

TOP VALUE IS THE SAMPLE LOCATION. 

BOnOM VALUE IS THE CONCENTRATION OF 

PCBs IN PPM OR mg/kg. 

FORMER AREA 3 OF THE SITE 

FORMER AREA 2 OF THE SITE 

40 80 

feet 

DES.BY: LEM DR.BY: JBC CK.BY: RDD 

O'CONNOR COMPANY SUPERFUND SITE 

2004 RIGGS BROOK SEDIMENT 

MONITORING REPORT 

FIGURE 3 

SUPPLEMENTAL SAMPLES 

TOTAL PCBs IN RIGGS BROOK 

WETLAND SOILS/SEDIMENTS 

ISFPTFMRFR ?n04 

SCALE: r=40' 

DATE: NOVEMBER 2004 

JOB NO.: 212004.01 

21174901-H003-MR 

WOODARD&CURRAN 

Engineering • Science • Operations 
DRAFT 

2.3 SEDIMENTAVETLAND SOIL SAMPLE COLLECTION METHODS 

The sample collection method used at each sample location is discussed in this subsection-. 

At submerged sample locations, sediment samples were collected using 1.5-inch diameter acetate (or 

similar material) macrocore liners. The acetate liner was manually pushed into the sediments to a depth 

of up to six inches. Once the liner was pushed to maximum penetration, the end of the liner that was not 

in the sediments was covered with a gloved hand to prevent the loss of the sample, and the liner was 

withdrawn from the bottom of the brook. Surface water was drained off, and the contents of the liner 

were emptied into a stainless steel bowl and homogenized. The homogenized sediments were then 

transferred into a sample jar. 

At non-submerged sample locations, wetland soil samples collected from 2001 to 2003 were obtained 

using a core sampler that was manually pushed into the ground. The core sampler contained a liner that 

filled with soils as the device was advanced into the ground. Wetland soil samples were collected from 

the surface to approximately six inches below ground surface (bgs). Samples were fransferred to a 

stainless steel bowl from the liner of the core sampler. The top portion of the wetland soil sample core 

generally consisted of grass and roots. The roots were shaken to remove any soil trapped within them and 

added to the soil from the remainder of the core. The roots and grass were discarded and were not 

included as part of the sample. The wetland soil sample was then homogenized and fransferred to the 

sample jar using a stainless steel spoon. From 1996 to 2000 wetland soil samples were collected using 

stainless steel spoons. Sediment/wetland soil samples consisted of discrete samples, collected at a depth 

of 0 to 6 inches below the ground or sediment surface. 

Stainless steel bowls and spoons were decontaminated between sample locations in accordance with the 

SAP. Acetate macrocore and core sampler liners were disposed of after each sample was collected. 

WOODARD & CURRAN (212004.01) Page 10 12/02/2004 

DRAFT SED RPT 2004 
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2.4 COMPOSITION OF SEDIMENTAVETLAND SOILS 

The majority of the sediment/wetland soil samples collected during the 2004 sampling effort consisted of 

clay often overlain by several inches of organics. A small number of samples also had silt, sand and 

gravel mixed in with the clay. The percent solids content of the sediment/wetland soil samples ranged 

from 35 percent at 8012 to 77 percent at 8015. 

WOODARD&CURRAN (212004.01) Page 11 12/02/2004 

DRAFT SED RPT 2004 
SECTION 3 
DRAFT 

3. SEDIMENTAVETLAND SOIL ANALYTICAL METHODS AND RESULTS 

This section describes sediment/wetland soil analytical methods, and summarizes the analytical results. 

3.1 SEDIMENTAVETLAND SOIL ANALYTICAL METHODS 

All sediment/wetland soil samples were analyzed for PCBs using USEPA Method 8082 at Severn Trent 

Laboratories in Buffalo, New York. Laboratory analytical levels were consistent with USEPA Level W 

requirements. Sample analysis for PCBs included the following Arochlors: Arochlor 1016, 1221, 1232, 

1242, 1248 1254 and 1260. 

The calibration levels used for Arochlors 1016 and 1260 were 0.025, 0.05, 0.10, 0.25, 0.50, 1.0, and 2.5 

ppm. A single point calibration standard was used for all other Arochlors. Most samples had PCB 

concenfrations that were either non-detect or were within the calibration range used for the associated 

instrumentation. However, dilutions were performed for 3018.2004 (fifty-fold dilution) and 8004.2004 

(fifty-fold dilution) to bring sample concenfrations within the calibration range. 

3.2 SEDIMENTAVETLAND SOIL MONITORING RESULTS 

The analytical results obtained from the September 13 and 14, 2004 sampling effort are summarized in 

Table 3 and Figures 1 through 3. 

The concenfrations of total PCBs for 34 of 36 sample locations were below the action level of 5 mg/kg. 

PCBs were not detected in samples collected at any of the upsfream sediment sample locations (8001, 

8002A, 8002B). PCBs exceeded the action level at two sample locations adjacent to the Site (3018 at 18 

mg/kg and 8004 at 8.2 mg/kg). With the exception of those two samples, the concenfrations of total 

PCBs in sample locations adjacent to the Site (8003 to 8017, supplemental grid sample locations and 

3018, 8039) ranged from < 0.021 to 2.1 mg/kg. PCBs were not detected in 8 of the 27 samples collected 

from this area. Concenfrations of PCBs at the downsfream locations (8018 - 8023), ranged from < 0.025 

to 0.048 mg/kg. 

WOODARD&CURRAN (212004.01) Page 12 12/02/2004 

DRAFT SED RPT 2004 
TABLE 3: 

DRAFT 

2003 RIGGS BROOK SEDIMENT/WETLAND SOIL MONITORING SAMPLE RESULTS 

,^ 1 Samp'le.ID i \ i \ 

3018.2004 

8001.2004 

8002A.2004 

8002B.2004 

8003.2004 

8004.2004 

8005.2004 

8006.2004 

8007.2004/8007.2004.51 

8008.2004 

8009.2004 

8010.2004 

8011.2004 

8012.2004 

8013.2004 

8039.2004 

8014.2004 

8015.2004 

8016.2004 

8017.2004/8017.2004.51 

8018.2004 

8019.2004 

8020.2004 

8021.2004 

8022.2004 

8023.2004 

9A925.2004 

9B925.2004 

9B000.2004 

9C925.2004 

9C000.2004 

9C025.2004 

9C050.2004 

9C075.2004 

9C 100.2004 

9C125.2004 

.^^Total PCB Concentration 

T ^A'/ 'S ^(mg/Tcg) > ^) . 

18 

<0.028 

<0.04 

<0.027 

<0.025 

8.2 

0.024 J 

0.59 

0.48 J/0.48 J 

<0.024 

0.22 

<0.024 

<0.023 

0.57 J 

<0.022 

<0.027 

0.43 

<0.021 

<0.024 

0.067/0.047 J 

0.034 J 

0.037 J 

0.021 J 

0.032 J 

0.048 

<0.025 

0.68 J 

0.27 

1.4 J 

0.3 J 

0.79 J 

0.058 J 

0.59 J 

0.2 J 

2.1 

0.63 J 

*' * SamplelLocation " 

Adjacent to 0 Connor Site 

Upsfream of O'Connor Site 

Upsfream of O'Connor Site 

Upstream of O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Downsfream of O'Connor Site 

Downsfream of O'Connor Site 

Downsfream of O'Connor Site 

Downsfream of O'Connor Site 

Downsfream of O'Connor Site 

Downsfream of O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Notes: 

Duplicate samples are identified with .51 suffix. 

J Qualifier indicates the sample concentration is estimated. 

WOODARD & CURRAN (212004.01) 

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Page 13 12/02/2004 
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3.3 SEDIMENT/WETLAND SOIL QUALITY CONTROL RESULTS 

The concenfrations of PCBs obtained during the 2004 Riggs Brook Sediment/Wetland Soil sampling at 

Riggs Brook were validated to determine the quality and usability of the data. A USEPA Tier III data 

validation procedure was used. The Tier III validation includes a completeness check, a review of all 

quality confrol results as well as a review of all raw data. References used to complete the validation 

process include the USEPA Region I Functional Guidelines for Evaluating Organic Analyses (USEPA, 

modified 1988), the SCRA QAPP (W&C, 1996) and the Riggs Brook SAP (W&C, 1997). Validation 

results and data quality assessments were based on the performance demonsfrated in the analyses of 

quality confrol samples. Sample qualifiers and flags were applied based on these results. This section 

includes an evaluation of quality confrol elements, a summary of quality confrol sample results, and an 

evaluation of precision, accuracy, representativeness, completeness and comparability (PARCC). 

3.3.1 EVALUATION OF QUALITY CONTROL ELEMENTS 

Quality control elements included in the Tier III validation and data assessment were data completeness, 

holding times, method blanks, surrogate recoveries, equipment and field blanks, calibration results, matrix 

spikes, laboratory control samples and duplicate samples. 

3.3.1.1 DATA COMPLETENESS 

The data package from Severn Trent Laboratories, Inc., Buffalo, NY, was reviewed to ensure that all 

sample and associated quality assurance results were available. Samples collected in association with the 

2004 sediment/wetland soil sampling effort were analyzed in sample delivery group (SDG) A04-8844. 

Results of the completeness review indicate that all collected samples were analyzed and, with one 

exception, all quality confrol results were available to complete data validation procedures. Percent 

differences (%Ds) between positive detections obtained from two dissimilar GC columns were not 

included in the data package. The %Ds are used to evaluate the accuracy of reported detections and, for 

this data set, the %Ds were manually calculated from the raw data during validation. Data validation 

results were used to assess the overall quality of reported PCB concenfrations. 

3.3.1.2 METHOD BLANKS 

Method blanks were analyzed to determine if concenfrations of PCBs were infroduced at the laboratory 

during the preparation and analysis of the samples. Method blanks consisted of analyte free soil, which 

was exfracted and processed in an identical maimer to the sediment/wetland soil samples. There were no 

detections of PCBs in any of the method blanks associated with sediment/wetland soil samples collected 

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during the 2004 sampling event, indicating that laboratory contamination of PCBs into sediment samples 

did not likely occur. 

3.3.1.3 SURROGATE RECOVERIES 

Two surrogates, decachlorobiphenyl (DCB) and tefrachlorometaxylene (TCMX), were added to each 

sample prior to exfraction to monitor sample matrix effects and to determine if the instrumentation used to 

obtain PCB concenfrations was responsive and functioning correctly. A known concenfration of each 

surrogate was added to each sample prior to sample exfraction and analysis. The reported concenfration 

of each surrogate was divided by the known concenfration to obtain a percent recovery. The percent 

recoveries obtained from the sample analyses were compared to advisory limits established for USEPA 

Method 8082. The USEPA advisory limits for the surrogate recoveries were statistically derived at the 

analytical laboratory. The advisory limit for acceptable DCB recoveries was 36-153%. For TCMX, the 

advisory limits were 32-148%. The recoveries of both surrogates were within the advisory limits for all 

samples analyzed without significant dilutions. Surrogate recoveries were diluted out, and therefore not 

evaluated, for the following samples that required dilutions at the instrument: 3018.2004 (fifty-fold 

dilution) and 8004.2004 (fifty-fold dilution). Surrogate recoveries were reported only from the column 

used to obtain reported sample concenfrations. Overall, the surrogate recovery data indicate that matrix 

interference was not evident and the analytical instrumentation was functioning properly. 

3.3.1.4 EQUIPMENT AND FIELD BLANKS 

Two equipment blanks, EB.100.2004 and EB.101.2004, were collected and analyzed in association with 

sediment sampling activities to measure the effectiveness of decontamination procedures in the removal 

of target compounds. Distilled water was poured into a decontaminated stainless steel bowl and spoon 

that were used in the homogenization of the sediment samples. The distilled water was poured from the 

bowls into sample containers. There were no PCBs detected in the equipment blanks, indicating that 

decontamination procedures were effective in the removal of potential contamination. 

One field blank (FB. 100.2004) was collected and analyzed to determine PCB concenfrations in the source 

water used for decontamination of the sediment sampling equipment. Data from the field blank analysis 

were used to examine the potential for contamination of the sampling equipment, and ultimately of the 

sediment samples, from the source water. The source water used as a final rinse to decontaminate the 

sediment sampling equipment was commercially purchased distilled water. No PCBs were detected in 

the field blank indicating that the source water was not likely a potential contamination source for 

sediment samples. 

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3.3.1.5 CALIBRATION RESULTS 

Calibration results were reviewed to determine if sample results were accurately quantified. Two types of 

calibrations were included in the review: initial calibrations and continuing calibrations. 

Initial calibrations were evaluated based on instrument responses to different concenfrations of standards 

of the target Arochlors. Instrument responses were plotted against the concentrations of seven standards 

to obtain a calibration curve from which all sample concenfrations were obtained. The concenfrations of 

the standards used to create the calibration curves for Arochlor 1016 and Arochlor 1260 were 0.025, 0.05, 

0.10, 0.25, 0.50, 1.0, and 2.5 ppm. The correlation coefficient provided a measure of the linearity of the 

calibration curve. The initial calibration requirement specified in the SCRA QAPP was for the correlation 

coefficient to be 0.99 or better. 

Initial calibrations for Arochlor 1016 and Arochlor 1260 were created on August 20, 2004, for the A and 

B charmels of the gas chromatograph. Single point initial calibrations were utilized for quantification of 

Arochlors 1221, 1232, 1242, 1248, and 1254. All single point initial calibrations were analyzed on 

August 20, 2004, for both channels of the gas chromatograph. Initial calibration results were acceptable 

for all Arochlor peaks on both charmels indicating that sample concenfrations were accurately quantified. 

Continuing calibration results were analyzed to provide a check of the accuracy of the analytical 

instrumentation. Continuing calibration results were assessed by comparing reported concenfrations 

against true concenfrations of a standard. The SCRA QAPP requirement for acceptance of continuing 

calibration results was a percent difference of 15.0% or less between the reported concenfration and the 

true concenfration. 

Continuing calibration standards were analyzed on September 21, 2004. With the exception of one 

continuing calibration standard (9/21/04 14:18), continuing calibration results associated with the 2004 

sediment sample analyses were within confrol limits, indicating accurate sample quantification for all 

analytes. For the continuing calibration standard analyzed 9/21/04 at 14:18, the percent difference for 

Arochlor 1260 (15.2%) for one column (Channel A) was greater than the confrol limit of 15.0%. Sample 

results were reported unqualified because all Arochlors were reported from the B channel which was 

demonsfrated to be in confrol. 

3.3.1.6 MATRIX SPIKE SAMPLES 

Matrix spike and matrix spike duplicate (MS/MSD) samples were used to determine if matrix 

interferences affected the recovery of PCB concenfrations in samples. For example, certain types of soil 

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such as peat absorb molecules of organic compounds such as PCBs very tightly, making it difficult to 

exfract the organic compounds from the soil. For mafrix spike analyses, known concenfrations of 

Arochlor 1254 were added to sediment samples before exfraction and analysis. The concenfrations of the 

Arochlor obtained from the analyses were divided by the known concenfrations to obtain percent 

recoveries. The criteria used in the determination of mafrix effects are obtained from performance data 

generated from the analysis of quality control samples. For Arochlor 1254, the acceptance range for 

mafrix spike recoveries was 52-153%. During the 2004 sediment sampling event, mafrix spike samples 

were collected at 8006.2004 and 8013.2004. The MS/MSD samples were designated with a .52 as a part 

of the sample identification to differentiate them from the original samples. MS/MSD recoveries of 

Arochlor 1254 were within the acceptance range for both sets of MS/MSD analyses. 

3.3.1.7 LABORATORY CONTROL SAMPLES 

Laboratory confrol samples were used to determine the accuracy of the analj^ical method used to obtain 

sample concenfrations. Laboratory confrol samples consist of analyte-free soil to which known 

concenfrations of Arochlor 1254 were added. The reported concenfrations were divided by the known 

concenfrations to obtain percent recoveries. Laboratory confrol sample recoveries were compared to 

statistically derived acceptance limits. The acceptance limits were 52-153% for Arochlor 1254 in the 

LCS analysis. 

All laboratory confrol sample recoveries were within confrol limits, indicating that the analytical accuracy 

demonsfrated during sample analysis was acceptable. 

3.3.1.8 FIELD DUPLICATE SAMPLES 

Duplicate samples are two different samples collected from an identical location. The purpose of 

collecting duplicate samples was to measure the precision of the reported PCB concenfrations. Precision 

is expressed in terms of relative percent difference (RPD). The RPD was calculated by taking the 

difference between the sample and its duplicate and dividing it by the average of these results. Evaluation 

of the RPD was used to determine if there was variability in sample collection and analysis and to 

a 

determine whether the concenfrations of the target compounds were homogeneously distributed 

throughout the sample matrix. Duplicate concenfrations were considered to be in agreement (compare 

well) if the RPD between PCB concenfrations was less than 50% (USEPA, 1988). Duplicate 

sediment/wetland soil samples were designated with a .51 suffix as part of the sample identification to 

differentiate them from other sediment samples. 

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Duplicate samples were collected at 8007.2004 and 8017.2004 during the 2004 Riggs Brook 

sediment/wetland soil-sampling event. The RPDs between the concenfrations of target Arochlors for the 

duplicates and corresponding samples were below 50%. The duplicate data suggest that an acceptable 

level of precision was achieved during sample collection and analysis. 

3.3.1.9 SAMPLE QUANTIFICATION 

Positive concenfrations of Arochlors were confirmed by analysis on two dissimilar gas chromatographic 

columns. Results from Charmel A and Channel B were compared to evaluate the precision between the 

two columns. The relative percent difference (RPD) between results was calculated for each positive 

Arochlor detection, and reported concenfrations for which the %D between columns was greater than 

25% have been qualified as estimated (J). Based on %Ds greater than 25%, the following sample results 

for Arochlor 1248 have been qualified as estimated (J): 8018.2004, 8019.2004, 8020.2004, 8021.2004, 

9C000.2004, and 9C075.2004. Based on %Ds greater than 25%, the following sample results for 

Arochlor 1254 have been qualified as estimated (J): 8007.2004, 8007.2004.51, 8017.2004.51, 

9A925.2004, 9B000.2004, 9C025.2004, 9C050.2004, 9C125.2004, and 9C925.2004. Based on %Ds 

greater than 25%), the following sample results for Arochlor 1260 have been qualified as estimated (J): 

8005.2004, 8012.2004, 8018.2004, 8019.2004, and 8021.2004. 

The laboratory reported all positive detections from the B channel regardless of the relative 

concenfrations obtained on the two channels. The higher of two results was reported for most of the 

positive detections. The lower result was reported for the following: Arochlor 1248 in samples 

8006.2004 and 9C075.2004; Arochlor 1254 in samples 8007.2004, 8007.2004.51, 8017.2004, 

8017.2004.51, 8022.2004, 9A925.2004, 9B000.2004, 9B925.2004, 9C025.2004, 9C050.2004, 

9C125.2004 and 9C925.2004; and Arochlor 1260 in sample 8007.2004.51. 

3.3.2 SUMMARY OF QUALITY CONTROL SAMPLE RESULTS 

A Tier III validation review was completed for all sediment/wetland soil samples collected from Riggs 

Brook in 2004. A review of all results and quality confrol elements indicated that based on the 

deliverables requested from the laboratory the data package was one hundred percent complete for the 

sediment/wetland soil samples collected and all associated quality confrol results. All of the blanks 

(method, equipment, and field) were non-detect for PCBs indicating that contamination of samples from 

outside sources did not likely occur. Surrogate compound recoveries were within acceptance limits for all 

samples suggesting that matrix interferences were not evident and the analytical system was in confrol. 

Recoveries of laboratory confrol samples bracketing the sediment samples were in confrol for Arochlor 

WOODARD & CURRAN (212004.01) Page 18 12/02/2004 

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1254 indicating that sample concenfrations were accurately reported. Two samples, 8006.2004 and 

8013.2004, were analyzed for matrix effects using matrix spikes of Arochlor 1254. Mafrix spike results 

for both samples were acceptable. 

All initial calibrations were in criteria indicating that satisfactory calibration curves from which accurate 

sample concenfrations could be obtained were generated. All continuing calibration results associated 

with reported sample concenfrations were within confrol limits indicating that accurate quantifications for 

all Arochlors could be achieved. Duplicate samples were collected at 8007.2004 and 8017.2004. The 

results for the two duplicate pairs were within control limits indicating that the level of precision was 

acceptable. 

3.3.3 EVALUATION OF PARCC PARAMETERS 

Quality confrol results obtained during the 2004 Riggs Brook Sediment/Wetland Soil Sampling event 

were also reviewed to determine if PARCC objectives were met, as outlined in the SAP. Components 

used to complete the PARCC assessment were obtained from the Tier III validation review. PARCC 

results are summarized below. 

3.3.3.1 PRECISION 

Precision was expressed in terms of RPD between samples and associated duplicates, and between MS 

and MSD results. The precision requirement specified in the SAP for the RPD between both pairs of 

these quality confrol samples is 50% or less. 

Duplicate samples were collected at 8007.2004 and 8017.2004. RPDs between sample and field duplicate 

results were within confrol limits for both sets of sample duplicates for all Arochlors. 

Two pairs of MS/MSD samples, 8006.2004 and 8013.2004, were analyzed in association with the 2004 

Riggs Brook Sediment/Wetland Soil samples. The RPDs between MS and MSD recoveries of Arochlor 

1254 were below 50% for both pairs of samples. 

Based on the results of mafrix spike and duplicate analysis, the levels of sampling and analytical precision 

are acceptable. 

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3.3.3.2 ACCURACY 

Accuracy is a measure of agreement between results obtained from an analytical method compared with 

known values. Accuracy of the sediment/wetland soil concenfrations was evaluated through a review of 

laboratory confrol sample results. 

Laboratory control samples are soils that are spiked with known concentrations of Arochlor 1254. The 

soils have been previously analyzed and are known to be free of PCB contamination prior to addition of 

the spike. The reported concenfrations of Arochlor 1254 were divided by the known concentrations to 

obtain percent recoveries. The percent recoveries of the laboratory confrol samples were compared 

against the recovery criteria specified in the SAP. All recoveries were in criteria indicating that sample 

concentrations were accurately quantified. 

3.3.3.3 REPRESENTATIVENESS 

Representativeness expresses the degree to which data accurately and precisely represent a characteristic 

of the population, parameter variation, or environmental condition. Representativeness is confrolled 

through measurement of precision and accuracy and comparing the results versus project objectives. 

Methods to evaluate precision and accuracy, as described previously, have indicated that the data are 

representative. A consistent method of sample collection and homogenization has assured that 

representative samples were collected. The comparability data, described in the last subsection of the 

PARCC discussion, demonsfrate the consistency of the sample collection methods and therefore, also 

demonsfrate that reported PCB concenfrations are representative. 

3.3.3.4 COMPLETENESS 

Completeness is a measure of the amount of valid data obtained from a measurement system compared to 

the amount expected. The completeness goal for the project as required by the QAPP is 90%. One 

hundred percent of the data were validated and accepted indicating that the data set is complete for 

samples collected during this investigation. 

3.3.3.5 COMPARABILITY 

Comparability is a qualitative and quantitative assessment of how different data sets can be compared to 

each other. For the sediment/wetland soils collected at Riggs Brook, comparability was measured by 

analysis of the duplicate results. The duplicate results were used to assess the variability of PCB 

concenfrations in the sediment/wetland soil samples. Variability may be due to sampling and/or 

analytical techniques or heterogeneity of PCB concenfrations throughout the sample matrix. As stated 

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above, the RPD between sample and duplicate concenfrations was required to be 50% or less. The results 

from analysis of all pairs of duplicates met criteria indicating that the comparability and consistency of 

the reported results was satisfactory. 

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SECTION 4 
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4. SUMMARY OF 2004 SEDIMENT/WETLAND SOIL ANALYTICAL RESULTS 

This section compares 2004 sediment analytical data to the target level of 5 mg/kg total PCBs, and to 

PCB concenfrations reported from the 1996 through 2003 sediment/wetland soil sample collection events. 

4.1 COMPARISON OF 2004 SEDIMENT/WETLAND SOIL ANALYTICAL RESULTS TO TARGET LEVEL 

A total of 36 sediment/wetland soil samples were collected during 2004 sampling activities. 

Concenfrations of total PCBs for 34 of 36 sediment samples were below the target level of 5 mg/kg. 

Concenfrations of total PCBs exceeded the target level at sample locations 3018 (18 mg/kg) and 8004 (8.2 

mg/kg). 

4.2 COMPARISON OF 2004 SEDIMENT/WETLAND SOIL ANALYTICAL RESULTS TO PREVIOUS 

SEDIMENT/WETLAND SOIL DATA 

Table 4 provides a comparison of analytical results of the 2004-sediment/wetland soil samples to 

analytical results obtained from samples collected from 1996 through 2003 at the same locations. Sample 

locations identified in the 1987 E.C. Jordan RI were slightiy different than locations outiined in the SAP, 

therefore the data obtained from this investigation were not directly compared to the 2004 data. 

Analytical results from the 1987 RI are located in Appendix B. 

4.3 MANN-KENDALL STATISTICAL TREND TEST 

As required in the SAP, a Mann-Kendall statistical frend analysis was completed to determine if total 

PCB concenfrations were increasing or decreasing at sample locations with at least four years of data. 

Sufficient data were available to complete this test at 36 sampling locations. Data was collected for these 

locations from 1996 through 2004. The ChemStat program (Version 5.0), which has statistical software 

including the Mann-Kendall test, was used to complete the analysis. The results from the Mann-Kendall 

test are included in Appendix C. 

A review of the results of the Mann-Kendall frend test indicate, with a 95% confidence interval, that three 

samples out of 36 showed frends. Results of the Mann-Kendall analysis are included in Appendix C. 

Two sample locations (8006 and 9C075) showed downward frends and one sample location (9A925) 

showed an upward frend. At sample location 8006, PCB concenfrations increased from 0.77 mg/kg in 

1996 to approximately 16 mg/kg in 1998, and then have steadily decreased to 0.59 mg/kg in 2004. At 

sample location 9C075, PCB concenfrations have decreased from 11.2 mg/kg in 2000 to 0.2 mg/kg in 

2004. At sample location 9A925, the location where Mann-Kendall showed an upward frend, the PCB 

concenfration was 0.086 mg/kg in 2001 and from 2002-2004, PCB concenfrations have ranged from 0.65 

WOODARD&CURRAN (212004.01) Page 22 12/02/2004 

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to 0.68 mg/kg, showing only a minute increase, and all concenfrations less than 1 mg/kg. The results of 

the Mann-Kendall test showed downward frends at several other sample locations (8001, 8002B, 8003, 

8005, 8011, 8015, 8016, 8020, 8021). However, PCB concenfrations at these sample locations have been 

non-detect a high percentage of the time, and therefore the test is showing a frend based on decreasing 

detection limits. Therefore, the Mann-Kendall test shows that there are no statistically significant frends 

at the remaining 33 sample locations. In addition, several sample locations including 8001, 8002A, 

8002B and 8015 have consistently had non-detect results for all sample years. For many locations such 

as 8003, 8005, 8010, 8016, 8017, 8021, 8022, 8023 and 8039 frace concenfrations of target Arochlors 

have been detected in only one or two years. 

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TABLE 4: COMPARISON OF 2004 SEDIMENT/WETLAND SOIL MONITORING RESULTS TO HISTORICAL RESULTS 

fs^W 

tessKf — 

..JftoTalfPGB^ 

'a)^^(iTi|/kg)fcjgfe mrmmmi 

feotatfeCBs; 

^v;«!^«i , •••.-•••• ••"• g^(Tng/kg)a> 

4?Trr ^ riHiWrf!' :-yf^^'i^ 

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, ..'ib;-'>,'^-

s^TdtaliPCBsf 

8001 <0.028 <0.032 <0.028 J <0.029 <0.031/<0.031 <0.07 < 0.092 J <.073 <.066 

8002 NS NS NS NS NS NS NS NS <.063 

8002A <0.04 <0.039 <0.026 J <0.028 < 0.022 < 0.063 < 0.079 <.046 NS 

8002B <0.027 <0.037/<0.035 <0.025 J <0.03 < 0.035 < 0.063 < 0.050 <.063 NS 

8003 <0.025 <0.031 <0.027 J <0.024 < 0.029 < 0.066 < 0.063 <.05 .097 J 

8004 8.2 <0.024 J <0.02 J <0.022 < 0.026 < 0.042 NS 29 2.8 J 

3018 li 4.4 J 5.63 J 6.IJ 4.6 3.9 6.4 NS 4.1 J 

8005 0.024 J <0.027 <0.02 J <0.022 < 0.024 < 0.045 < 0.040 <.046/<.046 <.053 

8006 0.59 0.95/0.93 2.9 J 0.81 J/0.66 J 10.4 14.0 15.9/16.8 3.2 ,77 J 

8007 0.48 J/0.48 J 0.77/0.73 0.562 0.378 J 0.98 0.14 1.2 2.5 ,24 J 

8008 <0.024 0.035 0.034 J <0.027 < 0.027 0.095J/0.146J < 0.040 <.056 .047 J 

8009 0.22 0.20 0.304/0.293 0.13 J 1.1 0.154 0.340 .93 J .279 J 

8010 <0.024 <0.024 <0.02 <0.021 < 0.024 < 0.047 < 0.040 <.043 .11 J 

8011 <0.023 <0,029 <0.025 <0.025 < 0.026 0.053 0.053 .039 J .044 J 

8012 0.57 J 0.11 0.178 <0.024 0.14/0.168 < 0.059 0.530 .34 J 132J 

8013 <0.022 <0.023 <0.019 <0.019 < 0.022 0.052 J NS 5.7 J .47 J 

8039 <0.027 0.088 <0.024 <0.024 < 0.033 < 0.061 0.029 < 0.059 NS 

8014 0.43 0.17 0.206 J 0,238 J 1.5 <0,058/<0.052 0.430 .039 J .043J/.093J 

8015 <0.021 <0.024 <0,02 <0.021 < 0,025 < 0.045 < 0.046 <,092 <,046 

8016 <0.024 0.031 <0,027 J <0.032 < 0.041 < 0.058 0,071 <.053 <,056 

8017 0.067/0,047 J <0.034 <0,03 <0.031 < 0.031 < 0.057 0,670 <,056 <,053 

8018 0.034 J <0.048 0,2 J 0.3 J < 0.023 < 0.054 < 0.043 <,043 <.043 

8019 0.037 J <0.044 0.394 J 0.49 J < 0,030 < 0.050 0,276 ,247 J .029 J 

8020 0.021 J <0,032 J 0,077 J <0,028 <0,028/<0.05 < 0.044 <0.053/<0.053 .234 .059 J 

8021 0.032 J <0.039/<0.039 <0,029 <0.032 < 0,026 < 0.057 < 0.063 ,103 J/.06 <.063 

8022 0,048 <0.038 0,039 J/0.042 J <0.029 < 0,026 < 0,055 < 0.063 <.063 <.059 

8023 <0.025 <0.03 <0.026 <0.025/<0.025 < 0.025 < 0,056 < 0.079 <.059 .05 J 

WOODARD & CURRAN (212004.01) 

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^99.6 

i^l 

9A925 0.68 J 0.67 0.65 J 0.086 J NS NS NS NS NS 

9B925 0.27 0.21 0.135 J 0.279 J NS NS NS NS NS 

9B000 1.4 J 2.1 0.9 0.65 J 12.6 NS NS NS NS 

9C925 0.3 J 0.77 2.32 0.68 J NS NS NS NS NS 

9C000 0.79 J 0.60 1.91 0;32J 2.05 NS NS NS NS 

9C025 0,058 J 0.49 0.76 J 0,035 ,99 NS NS NS NS 

9C050 0.59 J 0.35 1.44 J 0.39 J 7.3 NS NS NS NS 

9C075 0.2 J 0.78 ,94 J 2,32 J 11.2 NS NS NS NS 

9C100 2.1 1.1 1.13J 0.47 J 3.8 NS NS NS NS 

9C125 0.63 J 1.0 0.75 J 0.51 J 5.5 NS NS NS NS 

NOTES: 

Second concentration listed is concentration of duplicate sample. 

J Qualifier indicates the sample concentration is estimated. 

WOODARD & CURRAN (212004.01) 

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SECTION 5 
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5. CONCLUSIONS AND RECOMMENDATIONS 

A summary of the events and results associated with the 2004 Riggs Brook Sediment/Wetland Soil 

Sampling events are as follows: 

Concentrations of total PCBs were below the target level of 5 mg/kg at 34 of 36 (94%) sediment/wetland 

soil sample locations. Concenfrations of total PCBs exceeded 5 mg/kg at Riggs Brook sample locations 

3018 (18 mg/kg) and 8004 (8.2 mg/kg). 

Seven sample locations from the supplemental sampling grid added in 2000 were again sampled in 2004. 

Three locations (9A925, 9B925 and 9C925) added in 2001 were again sampled in 2004. These samples 

were analyzed to determine if there were frends of PCB concentrations over time since 2000 and 2001. 

Concentrations of total PCBs from all ten of these locations were below the target level of 5 mg/kg and 

were similar to concenfrations reported in previous years. 

The Mann-Kendall statistical frend analysis indicated that there were no statistically significant frends in 

PCB concentrations over the past nine years. 

The quality confrol results from data validation procedures indicate that the data are of good quality and 

acceptable for their end use of continued monitoring or PCB concenfrations in Riggs Brook near the 

O'Connor Superfund Site. 

Two sediment sampling locations exceeded the target level for PCBs of 5 mg/kg this year, 3018 (18 

mg/kg) and 8004 (8.2 mg/kg). The sporadic exceedances of the target level of 5 mg/kg may be due to the 

sorptive nature of PCBs. PCBs are more likely to sorb to soil/sediment with a high organic content. Due 

to the heterogeneous nature of sediments, PCBs could sporadically be detected at concenfrations above 

the target level. The physical fransport of PCBs on soil particles with water runoff can also result in 

redistribution of concenfrations to areas where water collects or pools. However sediment sample 

concenfrations do not indicate that PCBs have migrated into Riggs Brook since the completion of the 

Source Confrol Remedial Action in 1997. Based on past data, PCB concenfrations that sporadically 

exceed the target level have not been shown to be related to concenfrations of PCBs detected in biota 

collected from Riggs Brook. In fact, based on biota sample results for 1987, 1997 and 2000, 

concenfrations of PCBs have all been below the target level of 2 mg/kg and have generally decreased 

from 1987 to 2000. Therefore, based on these-conclusions and the fact that the Mann-Kendall Trend Test 

results for 2004 sediment sample results do not indicate any significant frends, no remedial action is 

recommended at this time. 

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LIST OF ACRONYMS AND ABBREVIATIONS 

bgs 

CMP 

DCB 

DGPS 

DQO 

ESD 

KAS 

mg/kg 

MS/MSD 

OU 

PARCC 

PCBs 

ppm 

below ground surface 

Cenfral Maine Power 

decachlorobiphenyl 

digital geographic positioning system 

Data Quality Objective 

Explanation of Significant Difference 

Katahdin Analj^ical Services 

milligrams per kilogram 

mafrix spike/matrix spike duplicate 

operational unit 

Precision, Accuracy, Representativen 

Polychlorinated biphenyls 

parts per million 

QAPP 

ROD 

RPD 

RI 

SAP 

SDG 

SCRA 

TCMX 

USEPA 

W&C 

Quality Assurance Project Plan 

Record of Decision 

Relative Percent Difference 

Remedial Investigation 

Sampling and Analysis Plan 

sample delivery group 

Source Confrol Remedial Action 

tefrachlorometaxylene 

United States Envirormiental Protection Agency 

Woodard & Curran 

WOODARD & CURRAN (212004,01) 

DRAFT SED RPT 2004 

ACRONYMS AND REFERENCES 12/02/2004 
DRAFT 

LIST OF REFERENCES 

Jordan Co., E.C. 1987; "Draft Remedial Investigation Report F.J. O'Connor Site, Volume I Technical 

Report"; December 1987. 

U.S. Environmental Protection Agency, 1988; "Region I Functional Guidelines for Evaluating Organic 

Analyses"; February 1, 1988, Modified November 1, 1988. 

U.S. Environmental Protection Agency, 1989; "Record of Decision Summary, O'Connor Company 

Superfund Site," Augusta, Maine; September 27, 1989. 

Woodard & Curran, 1996; "Source Confrol Remedial Action Quality Assurance Project Plan," 100 

Percent Remedial Design, O'Connor Company Superfiand Site, Augusta, Maine; July 1996. 

Woodard & Curran, 1997; "Final Riggs Brook Sediment and Biota Sampling and Analysis Plan," 

O'Connor Company Superfrind Site, Augusta, Maine; October 1997. 

WOODARD&CURRAN (212004.01) ACRONYMS AND REFERENCES 12/02/2004 

DRAFT SED RPT 2004 
APPENDIXA 
DRAFT 

APPENDIX A: SEDIMENT/WETLAND SOIL SAMPLING SURVEY DATA 

WOODARD&CURRAN (212004.01) APPENDICES 12/03/2004 

DRAFT SED RPT 2004 
DRAFT 

RIGGS BROOK SEDIMENT SAMPLING LOCATIONS 

O'CONNOR COMPANY SUPERFUND SITE 

AUGUSTA, MAINE 

V , ^ SAMPL E # 

8001 

8002 

8002A 

8002B 

8003 

8004 

8005 

8006 

8007 

8008 

8009 

8010 

8011 

8012 

8013 

8014 

8015 

8016 

8017 

8018 

8019 

8020 

8021 

8022 

8023 

8039 

9A925 

9B000 

9B925 

9C000 

9C025 

9C050 

9C075 

9C100 

9C125 

9C925 

>^ N®RTHIN G 7» 

535386 

535557 

535300 

534472 

535607 

535707 

535707 

535807 

535907 

535807 

535907 

535807 

535907 

536007 

, 535907 

536007 

535907 

536007 

536107 

536416 

537693.81 

538302 

538626 

539428 

541004 

535919.5 

535842 

535842 

535860 

535860 

535842 

535825 

535807 

535789 

535772 

535878 

'.f.i V EASTING^"?-;* i 

3064948 

3065016 

3064862 

3063799 

3065118 

3065118 

3065218 

3065218 

3065218 

3065318 

3065318 

3065418 

3065418 

3065418 

3065518 

3065518 

3065618 

3065618 

3065618 

3065612 

3065949.88 

3066212 

3066164 

3066756 

3067659 

3065518 

3065306 

3065271 

3065289 

3065253 

3065236 

3065218 

3065200 

3065183 

3065165 

3065271 

All coordinates in NAD-83 Maine West 

WOODARD & CURRAN (212004.01) 

DRAFT SED RPT 2004 

APPENDICES 12/03/2004 
APPENDIX B 
DRAFT 

APPENDIX B: 1987 REMEDIAL INVESTIGATION RIGGS BROOK SEDIMENT 

AND BIOTA DATA 

WOODARD&CURRAN (212004.01) APPENDICES 12/03/2004 

DRAFT SED RPT 2004 
DRAFT 

1987 RIGGS BROOK SEDIMENT SAMPLE RESULTS 

O'CONNOR COMPANY SUPERFUND SITE 

AUGUSTA, MAINE 

-'^ V^VSAMPLEID' -~ ^Cfi 

SED-1 

SED-2 

SED-7B 

SED-8 

SED-9 

SED-10 

SED-11 

SED-12 

SED-13 

SED-14 

SED-15 

SED-A 

SED-B 

SED-C 

• TOTALPCB^ ' ; ' ' 

^ CONCENTRATION (mg/kg) 

<0.12 

3.4 

4.1 

<0.10 

<0.10 

4.0 

4.5 

1.7 

<1.0 

<0.25 

<0.10 

4.2 

<1.0 

1 

: r SAMPLE LOCATION f { 

Upsfream of O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Cormor Site 

Adjacent to O'Connor Site 

Adjacent to O'Cormor Site 

Downsfream of O'Connor Site 

Downsfream of O'Connor Site 

Downsfream of O'Connor Site 

Downsfream of O'Cormor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

Adjacent to O'Connor Site 

WOODARD & CURRAN (212004.01) 

DRAFT SED RPT 2004 

APPENDICES 12/03/2004 
0 

[=3 

'] 

c 

o 

b 

0 

0^ ^^3] 

o 

\\ 

\\ 

r - \ ^ J <-' ^ 

u^-

1<S ^ 

^3 f\(? 

UPLAND . J 

_^MAR5H? 

Cd 0.11 

0.11 

C^ISJBUiraOGJ 

....x..-_:.^ :---. 

F; O'CONNER. ' 

SITE , 

y.c^ 

!'a 

y\.. STA 

BACKGROUND 

{SEE UDCATION INSERT) 

C-13(FROG> 

PC8T n j 

C-1« fTAPPOLES) 

PC8 T •n.\ 

C-15 (TADPO-ES) 

B< 

Cd 

Co 

Cr 

Cu 

F» 

M l 

K* 

Pb 

V 

9.t 

0.088 

0.35 

1.6 

4.1 

920 

IDO 

1580 

1.3 

0.61 

aBACKGROWO 

C.24 (SnCKlFflAraf^;) 

NOTES: 

1. ALL VALUES N ppm (mg/kg) 

2. CHEK^XCALS LBTED AT BACKGROUND STADONS rJCLUOE 

SS^TWSE^TCCTE D ABOVt METHOD DETECTION UMTS. 

3. CHEMTCALS LISTED AT OTHER ST.tTIONS WCLUOE ONLY 

THOSE DETECTED ABOVE BACKGROUND STATION VALUES. 

^ O 

0 

••* ^ 

C-1» (BUU-HEADS) 

PC8 T 003 

C-19 (PUMPXHSEEDS) 

^4A .:?•/ 

' I. 'i; 

Q 

PC8 T 0.04 

C-20 (G0LD6H SHHEfiS) 

PC8 T 0.02 

C-21 f TADPOLES) 

PCB T 0.18 

METALS - SEE BEIXDW. 

C-22 (BULUHEADS) 

METALS - SEE BELOW. 

C-23 (GOLDCM S»»gRS) 

METALS - SEE BEU3W. 

C.21 C- a C-23 

B« o.oia 

C * 850 

C d NO 

Co 0.20 

C« 1.1 

Cu 2.0 

Fa 420 

Hg 0.025 

K 1260 

Mo 200 

240 

2.4 

NO 

Hj300 

0.6M 

0.12 

0.94 

0.90 

330 

0.072 

2520 

620 

' ^ 

0.42 

0.36 

O i l 

26 

LEGEND 

-f-c- ^ MARSH 

•1^3^' ' BRUSH 

C ^ TREES 

===== = = DIRT ROAD 

PENCE LINE 

: PAVED ROAD 

r ~ ^ STRUCTURE 

^-@f — STREAM 

'•'.---I - POWER LINE 

) ( CULVERT 

• BIOTA SAMPLING 

LOCATION 

NO NON DETECT 

INSIGNIFICANT 

I CONCENTRATION 

« BACKGROUND 

STATIONS) 

^ ^•^,^ar^r.\ COMPOSITE SAMPLE 

C:13(FROG) ID NUMBER AND 

SAMPLE TYPE 

<3 

SCALE 

lo l.jio O l;00 FEET 

C-a fBLlU^gADS) 

PCS T 0.53 

C-9 (PUMPKXS£EDS> 

PCB T 0.74 

C-10 (dU-LXEADS) 

Cu i l 

C-2S (BUULHEAOS) 

PCSr 0.58 

C-2g P^)^PKHS££DS) 

I PC8 T 0.U 

C-TT rTADPOUES) 

PCST 0.44 

FIGURE 8-1 

BIOTA SAMPLING STATION LOCATIONS 

AMD SAMPLING RESULTS SUMMARY 

ECJC«RDANCQ 
APPENDIXG 
DRAFT 

APPENDIX C: MANN KENDALL TREND ANALYSIS SEDIMENT SAMPLE 

RESULTS 1996-2004 

WOODARD&CURRAN (212004.01) APPENDICES 12/03/2004 

DRAFT SED RPT 2004 
Mann-Kendall Trend Analysis Report 

Company: 

Site: 

Program: 

Minimum Size: 

Reported by: 

Report Options: 

Central Maine Ppwer 

O'Connor Company 

Superfund Site 

Riggs Brook Sediment 

MonitorinR Program 

3 

elloyd 

by sampling point 

Data Group: 

Date Range: 

Non-detects: 

Confldence Level: 

Range of Censoring: 

Report printed: 

Sediment 

1996-2004 

ND replaced with DL 

0.95 

0 %- 100% 

11/10/2004 

Mann-Kendall Trend Analysis Report performed in ChemStat v. 5.0 

PCBs 

Sample Location 

3018 

8001 

8002 

8003 

8004 

8005 

8006 

8007 

8008 

8009 

8010 

8011 

8012 

8013 

8014 

8015 

8016 

8017 

8018 

8019 

8020 

8021 

8022 

8023 

8039 

8002A 

8002B 

9A925 

9B000 

9B925 

9C000 

9C025 

9C050 

9C075 

9C100 

9C125 

9C925 

Unit 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

mg/kg 

Size 

8 

10 

1 

9 

8 

10 

12 

11 

10 

10 

9 

9 

10 

8 

11 

9 

9 

10 

9 

9 

11 

11 

10 

10 

8 

8 

9 

4 

5 • 

4 

5 

5. 

5 

5 

5 

5 

4 

%NDs 

0.0 

100.0 

100.0 

88.9 

62.5 

90.0 

0.0 

0.0 

50.0 

0.0 

88.9 

55.6 

20.0 

62.5 

18.2 

100.0 

77.8 

70.0 

66.7 

33.3 

63.6 

72.7 

70.0 

90.0 

75.0 

100.0 

100.0 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

Statistically Signiflcant 

Trend 

No 

Yes 

No 

Yes 

No 

Yes 

Yes 

No 

No 

No 

No 

Yes 

No 

No 

No 

Yes 

Yes 

No 

No 

No 

Yes 

Yes 

No 

No 

No 

No 

Yes 

Yes 

No 

No 

No 

No 

No 

Yes 

No 

No 

No 

Direction 

— 

Downward 

— 

Downward 

— 

Downward 

Downward 

— 

— 

— 

— 

Downward 

— 

— 

— 

Downward 

Downward 

— 

— 

— 

Downward 

Downward 

— 

— 

— 

— 

Downward 

Upward 

— 

— 

— 

— 

— 

Downward 

— 

— 

— 
Central Maine Power 

O'Connor Company Superfund Site 

Riggs Brool< Sediment Monitoring Program 

Sediment/Wetland Soil Monitoring Results 

Page: 1 of 9 

PERIOD: From 10/23/1996 thru 09/13/2004 - Inclusive 

SAMPLE TYPE: Soil 

SITE DATE 

RESULT 

TYPE SAMPLE ID PCB's 

(mg/kg) 

3018 

3018 

3018 

3018 

3018 

3018 

3018 

3018 

8001 

800,1 

8001 

8001 

8001 

8001 

8001 

8001 

8001 

8001 

8002 

8002A 

8002A 

80'02A 

8002A 

8002A 

8002A 

8002A 

8002A 

8O62B 

8002B 

8002B 

8002B 

8002B 

8002B 

8002B 

10/23/1996 

09/23/1998 

09/15/1999 

09/06/2000 

10/10/2001 

09/05/2002 

• 09/11/2003 

• ' 09/13/2004 

10/23/1996 

10/10/1997 

09/23/1998 

09/15/1999 

09/06/2000 

•.;;"/;•'•:^i09/66/2000;v;:i;,: 

10/10/2001 

;;:;;;;^;y';:.p9/05/2002.. 

09/11/2003 

y:,y:yl::-::m/02i}o^Z^^M 

' 10/23/1996 

;|;;;K;;:;^5iiQMti/Jr^ 

09/23/1998 

09/15/1999 

09/06/2000 

• 10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 

10/10/1997 

09/23/1998 

-- • 09/15/1999 -

09/06/2000 

- 10/10/2001 

09/05/2002 

09/11/2003 

Prim 

Prim 

Prim 

'- Prim 

Prim 

Pnm 

Pnm 

'Prim 

Pnm 

Prim 

Pnm 

- Pnm 

Pnm 

Dupl 

Prim 

Prim 

Prim 

Prim 

Pnm 

Prim 

Prim 

Prim 

Prim 

Prim 

Pnm 

Pnm 

Prim 

Prim 

Pnm 

Prim 

Prim 

Prim 

Prim 

Prim 

3018 

3018 

3018 

3018 • • 

3018 

3018^ 

3018 

3018 

8001 

8001 , 

8001 

8001 '. 

8001 

SOO'I 

8001 

8001 

8001 

8001 

8002 

8002A ' 

8002A 

8002A 

8002A 

8002A 

8002A 

8002A 

8002A 

8002B 

8002B 

80026 

8002B 

8002B 

8002B 

8002B 

4.1J 

6.4 

3.9 

-4-.6 

6.1J 

5 63J 

4 4J 

18 -

<0 066 

<0 073 

<0 092J 

' <0'070 

<0.031 

<0.031 

<0.029 

<0.028J 

<0 032 

-^0.028 

<0.063 

<d.046 

<0.079 

<0.063 

<0.022 

<0 028 

<0 026J 

<0.039 

<0.040 

•<0.063 

<0.050 

<0.063' 

<0.035 

<0.030' 

<0.025J 

0.037 

The following qualifier(s) exist: CLP 0: J —=Not analyzed 
Central Maine Power 

O'Connor Company Superfund Site 

Riggs Brook Sediment Monitoring Program 

Sediment/Wetland Soil Monitoring Results 

Page: 2 of 9 

PERIOD: From 10/23/1996 thru 09/13/2004 - Inclusive 

SAMPLE TYPE- Soil 

SITE DATE 

RESULT 

TYPE SAMPLE ID ' PCB's 

(mg/kg) 

8002B 

8002B 

8003 

8003, 

8003 

8003 

8003 

8003 

8003 

8003 

8003 

8004 

8004 

8004 

8004 

8004 

8004 

8004 • ' 

8004 

8do'4' -

8005 

'8005 

8005 

8005 

8005 

8005 

8005 

.8005 

8005 

8006 

8006 

;;80(i)6v:/:•;•• 

8006 

:m)6:y:}--

09/11/2003 

09/13/2004 

10/23/1996 

10/10/1997 

09/23/1998 

09/15/1999, 

09/06/2000 

10/10/2001 

09/05/2002 

' " Z 09/1'1/200,3 : 

09/13/2004 

. • 10/23/1996 " .'i ' 

10/10/1997 

09/15/1999 

09/06/2000 

10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 

10/23/1996 

10/10/1997 

10/10/1997 

09/23/1998 

09/15/1999 

09/06/2000 

10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 

10/23/1996 

10/10/1997 

•; •^^;: 09/23/1995 :•:;,;:; • 

09/23/1998 

;:,:.'•, ,09/15/1999 ••• J 

Dupl 

Prim 

Prim 

Prim 

Prim 

Prim 

Pnm 

'^' -'. Prim ' 

Prim 

Pnm 

Pnm 

Pnm 

Prim 

Prim , 

Pnm 

Pnm 

Prim 

Pnm 

Pnm 

'• 'Prim 

Prim 

Dupl 

Prim 

Prim 

Prim 

Pnm 

Prim 

• Pnm 

Prim 

Prim 

Prim 

•";'•:]•' 'Rri m :•:>:.:•" 

Dup1 

''.Z'-"'::Pr\my^-\^ 

8002B 

8002B 

8003 

8003 

8003 

8003 

8003 

8003 

8003 

8003 

8003 

8004 

8004 

8004 

8004 

8004 

8004 

8004 

8004 

8005 

8005 

8005 

8005 

8005 

8005 

8005 

8005 

8005 

8005 

8006 

8006 

: 80Ci6 

8006 

::,;; .0:8006 

0.035 

<0.027 

0.097J 

<0.05 

<0.063 

' <0.066 -

<0.029 

'<0.b24'-' 

<o'.027J 

<0.p31 

<0.025 

' 2.8J 

29 

<0.042 

<0.026 

<0.922 

<0.020J 

<0.024J 

82 

<0.053 

<0.046 

<0.046 

<0.040 

<0.045 

<0.024 

. <0'.022 

<0.020J 

' ' '<P-027 

0.024J 

. 0.77J 

3.2 

15.9 

16.8 

14 

The following qualifier(s) exist: CLP C: J —=Not analyzed 
Central Maine Power 

O'Connor Company Superfund Site 

Riggs Brook Sediment Monitoring Program 

Sediment/Wetland Soil Monitoring Results 

Page: 3 of 9 

PERIOD: From 10/23/1996 thru 09/13/2004 - Inclusive 

SAMPLE TYPE: Soil 

- . • ••.'•• • '.. • 

SITE \ 

8006 

•sopfe;-;'••:•.: 

8006 

8006 

8006 

8006 

8006 

8007 

8007 

8007 

8007 

8007 

8007 

8007 

8007 

8007 

8007 

8007 

8008 

8008 

8008 

8008 

8008 

8008 

8008 

8008 

8008 

8008 

8009 

pMb'- • •' 

8009 

; 8d(D9 • 

8009 

[sppg-:: 

DATE 

09/06/2000 

10/10/2001 

10/10/2001 

09/05/2002 

09/11/2003 

09/11/2003 

09/13/2004 

10/23/1996 

1 

10/10/1997 

09/23/1998, 

09/15/1999 

' 09/06/2000 

10/10/2001 

09/05/2002 

09/11/2003 

09/11/2003 

09/13/2004 

09/13/2004 

10/23/1996 

10/10/1997 

09/23/1998 

••b9'/15/1999 

09/15/1999 

09/06/2000 

10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 

10/23/1996 

10/10/1997 

09/23/1998 

09/15/1999 

09/06/2000 

10/10/2001 

RESULT 

TYPE 

Prim 

Prim 

Dupl 

Pnm 

Pnm 

Dup 1 

Pnm 

Prim ' i , 

Pnm 

Prim ; . 

Pnm 

Prim 

Pnm 

Prim 

Pnm 

Dup1 , 

Pnm 

Dup 1 ' -

Prim 

Prim 

Pnm 

Pnm ' 

Dup 1 

Prim 

Pnm 

Prim 

Prim 

. .'Prim 

Prim 

Prim 

Prim 

Pnm 

Prim 

Prim 

SAMPLE ID 

8006 

8006 

8006 

8006 

8006 

8006 

8006 

8007 

8007 

^ • 8007 

8007 

8007 

8007 

8007 

8007 

8007 

8007 

8007 

8008 

8008 

8008 

8008-

8008 

8008 

8008 

8008 

8008 

8008 

8009 

8009 

8009 

8009 

8009 

8009 

, 

PCB's 

(mg/kg) 

10.4 

0.81J _ , 

0.66J 

2.9J 

0.95 

0.93 

0 59 

0.24J '--. •', -

25 

12 '"-;-''. ! 

014 

0.98 

0.378J 

0.562 

0.77 

0.73 ;"•• 

0.48J 

0.48J 

0.047J 

<0.056 

<0.040 

. 0.095J .. . , ', . --. 

0.146J 

<0.027 

<0.027 

0.034J 

0.035 

<0.024 ' / - ••" 

0.279J 

0.93J 

0.34 

0.154 

1.1 

0.13d 

The following qualifier(s) exist: CLP C: J -

;:•,•;:::•.;•.• , -•;0'^\::':'>':'•;;••. ' 

•;:::>;,::-:;i:^::;::F;r::::;;'^/:;/ 

p:;:&-::;^.-;g;|iii:;:^:^^ 

;:>;;:;:.:::;:;-^||j:;|ii|:||^ 

$MmffS^^}&fff$-^ 

\y^J)'S^i:^M0ff9^ii-ZM5:\ 

%'j : ;;;;..;\":;i:'•^^;'^?;pg!;^j;;ih^;s;i^^: ^ifv-' 

-:-:.:,•/j::-.-:;,.^-.;;;-::-..;:^.;:-, , ,..; ; •.• : 

•i^';;yHi;.:;pii::i:;;;:i7fi'::l;';:i^^^ : 

\;yy. • ^yy-y'-yfik iy^Ci\^''My: \yy\'y % ••: 

\"K ;v:r^v';i':::Ov^;i;K-S:;:i;::N^:-:M; •^••. V 

'.yy ^^•yy.^y:,\:yyy^-^y'yyfi^i^yyyyyy:\'y"y 

• . ;• ••'•'.;• . iv-r!'::: : ^.^^\y': : . "^.. ' : • : 

••:--^r:-'"/:'i.':,:-;i;-:!:/i> : •;:••••;" ::«•••":,::: ' 

;:;•••;:-••.; 'y.yyyy^iy^^:{y\/i^t^yVr: y".'. ':[' ' V.'y-

•y-^:\y:iim:M;/BM^Mr:'f 

-=Not analyzed 
Central Maine Power 

O'Connor Company Superfund Site 

Riggs Brook Sediment Monitoring Program 

Sediment/Wetland Soil Monitoring Results 

Page: 4 of 9 

PERIOD: From 10/23/1996 thm 09/13/2004 - Inclusive 

SAMPLE TYPE: Soil 

SITE DATE 

RESULT 

TYPE SAMPLE ID PCB's 

(mg/kg) 

8009 

8009 

8009 

8009 

8010 

8010 

8010 

8010 

8010 

8010 

8010 

•8010 

8010 

8011 

8011 

^8011 

8011 

8011 

8011 

8011 

8011 

8011 

8012 

8012 

8012 

8012 

8012 

•8012 

8012 

8012 

8012 

8012 

8013 

8013 

09/05/2002 

09/05/2002 

09/11/2003 

09/13/2004 -

10/23/1996 

10/10/1997 

09/23/1998 

09/15/1999 

09/06/2000 ' 

10/10/2001 

09/05/2002 

09/11/2003' ,'• , 

09/13/2004 

;ip/23/ii996;;:;.;:;:-:;;:; 

10/10/1997 

09/23/i^98.'-:,i-:?7;: 

09/15/1999 

09/06/2606^1;; i?:^ 

10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 c , 

10/23/1996 " 

10/10/1997 

09/23/1998 

09/15/1999 ' 

09/06/2000 

09/06/2000 

10/10/2001 

09/05/2002-

09/11/2003 

09/13/2004 

10/23/1996 

10/10/1997 

Prim 

Dupl 

Prim 

Pnm 

Prim 

Pnm 

Pnm 

Pnm 

Pnm 

Prim 

Pnm 

Prim 

Pnm 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Pnm 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Dup 1 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

8009 

8009 

8009 

8009 

8010 

- '.8010 

8010 

' / '-SO'IO ,' , 

"' 8010 

;80ib 

8010 

. ' ''8010 

8010 

- 8011' 

8011 

8011 . 

8011 

'8011' 

8011 

8011 

8011 

''8011, 

8012 

8012 

8012 

8012 

8012 

8012 

8012 

,8012 

8012 

'8012 

8013 

8013 ' 

0.304 

0.293 

0.2 

0.22 

0.11J 

<0.043 

<0 040 

<0.047 

<0.024 

<0.p21 

<0.020 

<0.024 

<0.024 

"0.044J 

0.039J 

0.053 

0.053 

<0.026 

<0.025 

<0.025 

<0.029 

<0.023 

0.132J 

0.34J 

0.53 

<0.059 

0.14 

0.168 

<0.024 

0.178 

0.11 

0.57J 

0.47J 

5.7J 

The following qualifier(s) exist: CLP C: J —=Not analyzed 
Central Maine Power 

O'Connor Company Superfund Site 

Riggs Brook Sediment Monitoring Program 

Sediment/Wetland Soil Monitoring Results 

Page: 5 of 9 

PERIOD: From 10/23/1996 thai 09/13/2004 - Inclusive 

SAMPLE TYPE- Soil 

SITE DATE 

RESULT 

TYPE SAMPLE ID PCB's 

(mg/kg) 

8013 

8013 

8013 

8013 

8013 

8013 

8014 

8014 

8014 

8014 

8014 

8014 

8014 

8014 

8014 

8014 

8014 

8015 

8015 

8015 

8015 

.8015 

8015 

8015 

8015 

8015 

8016 

8016 

8016 

8016 

8016 

8016 

8016 

8016 

09/15/1999 

09/06/2000 

10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 , .,• 

10/23/1996 

10/23/1996 

10/10/1997 

09/23/19984, ,.;, 

09/15/1999 

0"9/15/1999 - . 

09/06/2000 

10/10/2001 

09/05/2002 

09/11/2003 ' 

09/13/2004 

10/23/1996 

10/10/1997 

09/23/1998 

09/15/1999 

09/06/2000 ' > 

10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 

10/23/1996 

10/10/1997 

09/23/1998 

09/15/1999 • 

09/06/2000 

10/10/2001 , 

09/05/2002 

09/11/2003 

Prim 

Prim 

Prim 

Prim 

Prim 

- Pnm 

Pnm 

Dupl 

Pnm 

. - -Pnm 

Pnm 

' ."" Dup 1 

Pnm 

., - Pnm 

Pnm 

' Pnm 

Pnm 

Pnm 

Pnm 

Pnm 

Pnm 

, :• - Prim • ' 

Prim 

Prim 

Prim 

.Prim 

Prim 

Prim 

Prim 

• Prim 

Prim 

' • Prim • 

Prim 

Prim 

8013 

8013 

8013 

8013 -

8013 

-' , ,-8013' '-

8014 

• 8014 

8014 

'.' , 8014 . 

8014 

• ' 80I4 

8014 

8014 

8014 

8014. 

8014 * 

8015 

8015 

'8015 

8015 

- ",8015 

8015 

8015 

8015 

8015 

8016 

.-., ,8016 

8016 

'8016 

8016 

' ' 8016-

8016 

8016 

0.052J 

<0.022 

<0.019 

<0.019 

<0.023 

<0 022 

0 043J 

0 093J 

0 039J 

0 43 

0 058 

0 052 

1 5 

0 238J 

0 206J 

0 17 

0 43 

<0 046 

<0.092 

<0.046 

<0.045 

<0.025 

<0.021 

<0.020 

<0.024 

- <0.021 

<0.056 

• <0.053 

0.071 

<0.058 

<0.041 

<0.032 

<0.027J 

0;031 

The following qualifier(s) exist: CLP C: J —=Not analyzed 
Central Maine Power 

O'Connor Company Superfund Site 

Riggs Brook Sediment Monitoring Program 

Sediment/Wetland Soil Monitoring Results 

Page: 6 of 9 

PERIOD: From 10/23/1996 thru 09/13/2004 - Inclusive 

SAMPLE TYPE: Soil 

SITE8016 

8017 

8017 

8017 

8017 

8017-

8017 

[•8017 - - ' 

8017 

8017 

8017 

8018 

8018 

'8018 

8018 

8018 

8018 

8018 • 

8018 

'8018 

8019 

'sojig-.. 

8019 

i;8019 

8019* 

8019 

8019 

8019 

8019 

8020 

8020 

' 8020" 

8020 

8020 

DATE 

09/13/2004 

10/23/1996 

10/10/1997 

09/23/1998 

09/15/1999 

09/06/2000 , • 

10/10/2001 

09/05/2002 .' ' 

09/11/2003 

09/13/2004 

09/13/2004 

10/23/1996 

10/10/1997 

;--.-;;-::^y:09/23/i;^98^;::;i 

09/15/1999 

:^.:: 09/06/2000'• ;;:•!;;:" 

10/10/2001 

.^iV . .09/05/2002;:^: ::;;:;i:: 

09/11/2003 

09/13/2004 

10/23/1996 

10/10/1997 , . .-. 

09/23/1998 

09/15/1999 

09/06/2000 

10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 

10/23/1996 

10/10/1997 

09/23/1998 • 

09/23/1998 

• 09/15/1999 

RESULT 

TYPE 

Prim 

Prim 

Prim 

Prim 

Prim 

Pnm 

Prim 

Prim 

Prim 

Prim 

Dup 1 

, .. -Prim 

Prim 

', ,' Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Pnm 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Dupl 

Prim 

SAMPLE ID • 

8016 

. 8017 

8017 

- 8017 

8017 

8017 

8017 

, '8017 -

8017 

8017 

8017 

,8018- , , 

8018 

' .8018-

8018 

8018 

8018 

8018' '' 

8018 

8018 

8019 

8019 

80'l9 

8019 

8019 

,8019 

8019 

'8019 

8019 

8020 

8020 

8020 

8020 

8020 

PCB's 

(mg/kg) 

<0.024 

<0.053 

<0.056 

0.67 . 

<0.057 

<0.031 

<0.031 

<0.030 .', • ' ' 

<0.034 

0.067 . • -

0.047J 

<0.043 " .. 

<0.043 

<0.043 

<0.054 

<0.023 

0.3J 

0.2J 

<0.048 

0.034J 

0.029J 

0.247J 

0.276 

<0:050 

<0.030 

0.49J 

0.394J 

<0.044 

0.037J 

0.059J 

0.234 

<0.053 

<0.053 

<0.044 

The following qualifier(s) exist: CLP C: J 

•••:: . 

:ii:-^-'::;l:^^;h-i';'^^:'--^'^^^i;^ 

yy^tiykMvy:yMr':-''-'-W 

:-yty,y\y:A^yyyy[]:y 

':--y::Wyyy-y-''y ^:| 

:^'v:-:v' - ••'•'••: •'.•••.'• • '•'•-^I'^. C 

''-•-y':"y-'^}y:['Yyk\y-''-':yyWy- . 

im^yZW^y.:,::-] .Zry:y:M 

''.•'.'•7..' . ••.:;•:.':;'•: ; • . •• ' •' • ','•':: : ';• " 

'.'::•_.:•. . . • .y.'.' ^ 

/:i|::"J;;r-;•:;;;•;:;•;::.;:r.:,.,.;v.- i:,!;;:..; .V:^ : 

—=Not analyzed 
Central Maine Power 

O'Connor Company Superfund Site 

Riggs Brook Sediment Monitoring Program 

Sediment/Wetland Soil Monitoring Results 

Page: 7 of 9 

PERIOD: From 10/23/1996 thai 09/13/2004 - Inclusive 

SAMPLE TYPE: Soil 

SITE 

8020 

;8020:' ••:.:. , 

8020 

8020 

8020 

8020 

8021 

8021 

8021 

8021 

8021 

8021 

8021 

8021 

8021 

8021 

8021 

8022 

8022 

8022 ' 

8022 

8022 

8022 

.8022 

8022 

8022 

8022 

8023 

8023 

8023 

8023 

:-8p23-;;.;';-'-^':-

8023 

80^3. ,.:':;•::;\ 

DATE 

09/06/2000 

: : 09/06/2000 

10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 

10/23/1996 

- 10/10/1997 

10/10/1997 

09/23/1998 

09/15/1999 

- ' 09/06/i2000 

10/10/2001 

09/05/2002 

09/11/2003 

09/11/2003 

09/13/2004 

10/23/1996 

10/10/1997 

09/23/1998 

09/15/1999 

09/06/2000 

10/10/2001 

09/05/2002 

09/05/2002 

09/11/2003 

09/13/2004 

10/23/1996 

10/10/1997 

:/:,.:;:.:: '.^09/23/1998-

09/15/1999 

; ..;p9/o6/26op;-. • 

10/10/2001 

::•••:;:•.•' :'i;0/1p/^b01-.::.::V 

RESULT 

TYPE 

Prim 

Dupl ' 

Prim 

Prim 

Prim 

Prim 

Pnm 

Pnm 

Dup 1 

•Pnm 

Pnm 

Pnm 

Pnm 

Pnm 

Pnm 

Dup l 

Pnm 

Pnm 

Pnm 

Pnm 

Pnm 

Prim 

Pnm 

Prim 

Dup l 

Pnm 

Prim 

Prim 

Prim 

Prim 

Prim 

• :'Prinrtj'. 

Prim 

. .-Dup l .:>:: . 

. 

SAMPLE ID 

8020 

..;'.:802P-: •;: 

8020 

8020 

8020 

8020 

8021 

8021 

8021 

, • 8021 •". 

8021 

'8021'- '' ' -

8021 

8021 

8021 

8021 

8021 

8022 

8022 

8022 

8022 

8022 

8022 

8022 

8022 

8022 

8022 

8023 

8023 

8023 

8023 

••••;• •8023':|-:.. 

8023 

:--'8023:.--'•;.;:•••;•• 

. PCB's 

(mg/kg) 

0.028 

;:; 0,05 • 

<0.028 

0.077J 

<0.032J 

0.021J 

<0 063 

'0.103J ' .';.- - . . : 

0 06 

.. <0.063 • ' . " • 7 ' ' 

<0.057 

. <0.026- ' ' ' : :,'*<[ 

<0 032 

<0.029 

<0 039 

<0.039 

0.032J 

<0 059 

<0.063 

<0 063 

<0.055 

<0.026 

<0.029 

0.039J 

0.042J 

<0.p38 

0.048 

0.05J 

<0.059 

<o.o79 :•.: • ;-:::':^'vv:":Wiii 

<0.05 6 

••'i; xo-02^':\;;M-. :•.:r;^.-:---.;::-:' -y^';•;-•::':' 

<0.02 5 

•;• • ::.'<o.o25;'.•.;, •• ••'.•' •,:.;;.;•.. >:• v: zM'fr' y 

The following qualifier(s) exist: CLP C: J —=Not analyzed 

<ytyy'% 

\ :.• ..-'.i^iv 

"'rcrF^Vyiyy 

•0-^yk 

••'.'.'. . • 

;'|;;-!__,.;!!:;. . 

; r:'.:;-:-:'--' 

/^:;:^- •' '\yv\\. 

:.:i;^^:;[./i-; 

;•''.'•;;••;;;;•_.,•• • 

WM 
Central Maine Power 

O'Connor Company Superfund Site 

Riggs Brook Sediment Monitoring Program 

Sediment/Wetland Soil Monitoring Results 

Page: 8 of 9 

PERIOD: From 10/23/1996 thru 09/13/2004 - Inclusive 

SAMPLE TYPE: Soil 

SITE DATE 

RESULT 

TYPE SAMPLE ID PCB's 

(mg/kg) 

8023 

8023 

8023 

8039 

8039 

8039 

8039 

8039 

8039 

8039 

8039 

9A925 

9A925 

.9A925 

9A925 

'9B000 

9B000 

9B000 

9B000 

9B000 

9B925 

!9B925 

9B925 

9B925 

9C000 

9C000 

9C000 

9Cp00 

9C000 

^Qmis.yi:'''': 

9C025 

'9ep25 : 

9C025 

••smzByf. y-:: 

09/05/2002 

09/11/2003 

09/13/2004 

10/10/1997 

09/23/1998 

; . ; -•;:;P9/15/1999 ;: 

09/06/2000 

^yWS0tiM/2op:iM 

09/05/2002 

;|||;:::;:D^/iji/2oP3:- ;• 

09/13/2004 

^:;'•^;;::p;;;s1p/1b/2P01r•. ;;•.:; 

09/05/2002 

:i;;i;>;,, ;09/1l/2pp3 . 

09/13/2004 

;:;:'^;-'Pi:'p9/06/2Pp6:;: v.-: 

10/10/2001 

:-;-''i:#::^;i:p9/65/2002:; 

09/11/2003 

yfiM:0m3(2m --j' -

10/10/2001 

' •, • 09/05/2002 

09/11/2003 

09/13/2004 

09/06/2000 

10/10/2001 

09/05/2002 

• 09/11/2003 

09/13/2004 

•:::;:.:,'::;'-09/06/2000. 

10/10/2001 

::./. 09/05/2002:.' 

09/11/2003 

' .::;,V.:09/13/2004:,..'.• 

Prim 

Prim 

Prim 

Prim - = 

Prim 

Pnm 

Pnm 

Pnm - ''.^ 

Pnm 

Pnm ' -

Pnm 

Pnm 

Pnm 

Prim 

Prim 

Prim • 

Prim 

Pnm 

Prim 

Prim' • 

Prim 

Prim 

Pnm 

Prim 

Prim 

Prim 

Prim 

,Pnm 

Prim 

Prim ' . • 

Prim 

Prim 

Prim 

Prim 

8023 

8023 

8023 

8039" , 

8039 

8039' 

8039 

- ' 8039 

8039 

, 8039 -•' 

8039 

9A925 

9A925 

9A925 

9A925 

9B000 

9B000 

9B000 

9B000 

'• ' 9B000 

9B925 

.• ;9B925 

9B925 

9B925 

9C000 

9C000 

9C000 

• . 9C0'0p 

9C000 

' 9C025 

9C025 

• 9C025 

9C025 

9C025 

<0.026 

<0.030 

<0.025 

<0.059 

0.029 

<0.061 

<0.033 

<0.024 

<0.024 

0 088 

<0.027 

0.086J 

0.65J 

0.67 

0.68J 

12.6 

0.65J 

0.9 

2.1 

1.4 J 

0.279J 

- , 0.-135J 

0.21 

0.27 

2.05 

0.32J 

1.91 

0.6 

0.79J 

1.99 

0.035 

0.76J 

0.49 

0.058J 

The following qualifier(s) exisL CLP C; J —=Not analyzed 
Central Maine Power 

O'Connor Company Superfund Site 

Riggs Brook Sediment Monitoring Program 

Sediment/Wetland Soil Monitoring Results 

Page: 9 of 9 

PERIOD: From 10/23/1996 thru 09/13/2004 - Inclusive 

SAMPLE TYPE: Soil 

•sitE'':; : ••.• 

9C050 

:;sc650:;:: ; 

9C050 

-9C050 

9C050 

9C075 

9C075 

-9C075. 

9C075 

.9C075' ' 

9C100 

-9C100 

9C100 

9C100 

9C100 

9C125 -

9C125 

9C125 

9C125 

'9C125- . 

9C925 

9C925 

9C925 

9C925 

•••' '"^DATE' • • 

09/06/2000 

::•:;:; ; 10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 

^ 09/06/2000 

10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 

09/06/2000 

10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 

09/06/2000 

10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 

10/10/2001 

09/05/2002 

09/11/2003 

09/13/2004 

REisULT 

.• TYPE-.'-

Prim 

: Prim :: 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Pnm 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

Prim 

SAMPLE ID 

9C050 

9C050 

9C050 

9C050 

9C050 

9C075-

9C075 

" -'9C075 -

9C;075 

• 96075 

9C100 

190100, 

9C100 

9Cl60 

9C100 

9C125 

9C125 

9C125 

9C125 

90125 

9C925 

9C925 • ' 

9C925 

9C925 

PCB's 

(mg/kg) 

7.3 

0.39J 

1.44J 

0.35 

0.59J 

11.2 

2.32J 

' 1.94J 

0.78 

0.2J 

3.8 

0.47J 

1.13J 

1.1 

2.1 

5.5 

0.51J 

0.75J 

1 

0.63d -' ' 

0.68J 

2.32 

0.77 

0.3J 

'.; ' ••.•'•'•;. • ..:•••• ' :.;.:• • ' -

Wiiv:.\--rWmM$WWZ 

i.yM:MWMmZMiy\Sy 

,;.;;,.:;:::.;;p::|h?'|:|i|:i|:|i 

•d:MWmWi0m m 

If:-- Wm^MWiW : 

•li • •4-'': --y'Z:Z-WMWS: 

[.'•yy-/x--§.WZ:-W\^M 

•. •' '•••'!. :V::;f:pr;i;-.rS«:;i!;; 

'•'• -y\-::yyiSvyyy::&:0:!Wi&i 

•::WW:-:M^ 

The following qualifier(s) exist: CLP C: J —=Not analyzed