ML070160222

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JAFNPP - SEIS Web Reference - Boyd and Biberhofer 1999
ML070160222
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Site: FitzPatrick Constellation icon.png
Issue date: 10/31/1999
From: Biberhofer J, Boyd D
Govt of Canada, Ontario Ministry of Natural Resources
To:
Office of Nuclear Reactor Regulation
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ISBN 0-7778-9257-X, PIBS 3927E
Download: ML070160222 (48)
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Ministry Ministre of the de Environment Environnement Environment lEnvironnement Canada Canada Large Volume Sampling at Six Lake Ontario Tributaries During 1997 and 1998:

Project Synopsis and Summary of Selected Results Prepared by:

D. Boyd Environmental Monitoring and Reporting Branch, Ontario Ministry of the Environment J. Biberhofer Environmental Conservation Branch, Environment Canada October 1999 Cette publication technique nest disponible quen anglais.

Copyright: Queens Printer for Ontario, 1999 This publication may be reproduced for non-commercial purposes with appropriate attribution.

Printed on 50% recycled paper including 10% post-consumer fibre ISBN 0-7778-9257-X PIBS 3927E

Contributors The authors would like to acknowledge the following list of additional contributors.

Survey Design: J. Anderson, (EC), R. Bilyea (MOE), M.. DAndrea (MOE),

S. Painter (EC)

Sample Collection: R. Bilyea (MOE), C. Cannon (EC), C. Strand (EC)

Sample Analysis: D. Boomer (MOE), C. Cannon (EC), M. Comba (EC), C. Strand (EC),

F. Tomassini (MOE)

Mapping/GIS: B. Neary (MOE)

Reviewed by: R. Vickers (MOE), F. Fleischer (MOE), P. Kauss (MOE), J. Mahoney (MOE), S. Maude (MOE), M. Neilson (EC), S. Painter (EC),

L.A. Cornacchio (MOE)

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Preface This data summary report, which does not include any statistically-based interpretation or discussion, has been prepared as a means of communicating results of this sampling exercise to all interested parties as soon as possible. The anticipated audience would include government agency staff associated with water quality management and the development of the Lake Ontario Lakewide Management Plan (LaMP), as well as researchers examining the ecosystem effects of toxic substances (persistent trace organics) within the Lake Ontario drainage basin. This study was undertaken as a screening level exercise to identify those watersheds (if any) exhibiting cumulative evidence of contaminant sources within their entire drainage area and to illustrate the general relationship between land use and water quality. It was not designed to identify specific contaminant sources within watersheds. The distribution of these data is intended to encourage and accelerate additional data synthesis and analysis by federal and provincial agency staff and the research community. It is anticipated that subsequent analysis will include a more rigorous statistical examination of the relationships among land use, flow conditions, and contaminant concentrations, along with a comparison of water quality findings with biomonitoring data. The potential application of these data to the estimation of loadings will also be examined.

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Table of Contents

1. INTRODUCTION 1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. LAKE ONTARIO DRAINAGE BASIN AND SAMPLING LOCATIONS 2.1 Summary Description of Lake Ontario Basin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Land Use and Pollution Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.3 Description of Sampling Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. SURVEY METHODS 3.1 Field Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 Laboratory Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.

SUMMARY

OF SELECTED RESULTS 4.1 Comparison with PWQOs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.2 Dry and Wet Weather Contaminant Concentrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5. CONCLUSIONS AND RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 APPENDIX A-1: DATA LISTING FOR STATION 89 CREDIT RIVER . . . . . . . . . . . . . . . . 20 APPENDIX A-2: DATA LISTING FOR STATION 90 HUMBER RIVER . . . . . . . . . . . . . . . 24 APPENDIX A-3: DATA LISTING FOR STATION 91 GANARASKA RIVER . . . . . . . . . . . 28 APPENDIX A-4: DATA LISTING FOR STATION 92 TRENT RIVER . . . . . . . . . . . . . . . . . 32 APPENDIX A-5: DATA LISTING FOR STATION 93 TWENTY MILE CREEK . . . . . . . . . . 36 APPENDIX A-6: DATA LISTING FOR STATION 94 TWELVE MILE CREEK . . . . . . . . . . 40

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List of Figures 2.1 Population Densities in the Lake Ontario Drainage Basin . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 !997/98 Tributary Toxics Monitoring Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1 Range of Daily Flows Corresponding to 1997/98 Sampling Episodes . . . . . . . . . . . . . . 13 4.2 Range of Suspend Solids Concentrations Sampled During 1997/98 . . . . . . . . . . . . . . . 13 4.3 Range of Total Phosphorus Concentrations Sampled During 1997/98 . . . . . . . . . . . . . 14 4.4 Range of Copper Concentrations Sampled During 1997/98 . . . . . . . . . . . . . . . . . . . . . . 14 4.5 Range of Zinc Concentrations Sampled During 1997/98 . . . . . . . . . . . . . . . . . . . . . . . . 15 4.6 Range of Benzo(a)pyrene Concentrations Sampled During 1997/98 . . . . . . . . . . . . . . . 15 4.7 Range of Lindane Concentrations Sampled During 1997/98 . . . . . . . . . . . . . . . . . . . . . 16 4.8 Range of Total PCB Concentrations Sampled During 1997/98 . . . . . . . . . . . . . . . . . . . 16 4.9 Range of Aldrin/Dieldrin Concentrations Sampled During 1997/98 . . . . . . . . . . . . . . . 17 4.10 Range of "-BHC Concentrations Sampled During 1997/98 . . . . . . . . . . . . . . . . . . . . . 17 4.11 Range of HCB Concentrations Sampled During 1997/98 . . . . . . . . . . . . . . . . . . . . . . . 18 List of Tables 2.1 Summary of Sampling Locations, Drainage Basin Areas, and Annual Average Flows for 1997/98 Tributary Sampling . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.1 Summary of Detection Limits and PWQOs for Trace Organics Sampled in 1997/98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2 Summary of Detection Limits and PWQOs for Trace Metals, Suspended Solids and Total Phosphorus Sampled in 1997/98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.1 Frequency of Detection Greater than Provincial Water Quality Objectives . . . . . . . . . . 11 4.2 Summary of Median Flows and Concentrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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1. INTRODUCTION

1.1 Background

A need to update and improve upon source, concentration, and loading information for persistent, bioaccumulative, trace organic contaminants (commonly referred to as persistent organic pollutants or POPs) in tributaries flowing into Lake Ontario was identified by both the Ontario Ministry of the Environment (MOE) and Environment Canada (EC) during 1996. The Province requires this information to assess surface water quality in Ontario according to the policies and Provincial Water Quality Objectives (PWQOs) 1 and as part of the development of a Provincial Toxics Plan for Priority Substances. The Canadian federal and provincial governments, in conjunction with U.S. state and federal governments, have also identified a further need for improved concentration and loading data during the development of a Lakewide Management Plan for Lake Ontario.

The principal limitation on previous measurement of tributary concentrations of trace organic contaminants (and hence estimated loadings) has been the difficulty achieving sufficiently low level analytical detection limits for these substances. In particular, the routine MOE detection limit for total PCBs in water has been 20 ng/L (positive identification of a trace amount) or ten times higher for a positively quantified result. This has not compared favourably with the PWQO of 1.0 ng/L and has precluded an accurate assessment of water quality status for this ubiquitous substance. Detection limits for other contaminants such as organochlorine pesticides have been better than this, but still not sufficiently below PWQOs to allow a quantitative assessment of compliance. In addition, existing routine tributary monitoring efforts by MOE have tended to under-sample during high flow events, biassing estimates of contaminant loadings towards low flow conditions.

Tributary and sewer effluent sampling studies by MOE and Metro Toronto (now City of Toronto) along the Toronto Waterfront during the period 1990 to 1993 successfully employed large volume sampling during wet and dry weather events to improve estimates of trace organic contaminant concentrations and loadings. These experiences demonstrated the potential for success of a low-level detection monitoring project to address data deficiencies for Lake Ontario tributaries, and in the spring of 1997 a collaborative sampling program was established between the Environmental Conservation Branch at Environment Canada and the Environmental Monitoring and Reporting Branch at the Ontario Ministry of the Environment. The arrangement was designed to allow sampling under a range of flow conditions during the summer and fall of 1997, and the winter and spring of 1998.

1 Water Management Policies, Guidelines Provincial Water Quality Objectives, 1995 1.2 Objectives Two of the principal objectives of the overall 1997/98 study were to:

(a) measure the ranges of contaminant concentrations under wet and dry conditions at a variety of Lake Ontario watersheds comprising a range of land uses near the point at which they flow into the lake and compare the results with PWQOs; and (b) use the data to screen these watersheds for anomalies indicative of potentially significant contaminant sources and which could justify the need for follow-up source track down monitoring.

The data were also collected with a view to estimating contaminant loadings from the selected tributaries to Lake Ontario by using the concentration data in conjunction with flow data.

Calculation of the uncertainty associated with these estimates is central to any such exercise since it is well documented that the confidence of any such calculation will be limited by the relatively small number of samples available through this study. This analysis and discussion will be the focus of a separate report.

2. LAKE ONTARIO DRAINAGE BASIN AND SAMPLING LOCATIONS 2.1 Summary Description of Lake Ontario Basin Lake Ontario is the last in the chain of Great Lakes and is the smallest Great Lake in terms of surface area (approximately 19,000 square kilometres) although its total volume of 1,640 cubic kilometres is over three times greater than that of Lake Erie. About 93% of the lake's water flows out through the St. Lawrence River and another 7% is lost through evaporation. The average residence time for water in the lake is approximately six years. On average, approximately 80%

of the water flowing into Lake Ontario comes from Lake Erie via the Niagara River with the remaining flow coming from tributaries within the Lake Ontario watershed and from precipitation. With a watershed land area of approximately 64,000 km 2 (of which slightly less than half lies in Ontario), Lake Ontario has the highest ratio of watershed land area to lake surface area of all the Great Lakes. The total estimated tributary flow to the lake is approximately 860 m3s-1 and is evenly divided between the Ontario and New York State portions of the lakes watershed at roughly 430 m3 s-1 each 2.

Although the peripheral upland areas of the Lake Ontario basin are forested, nearer the lake, the basin's climate and soil types support various agricultural activities (areas such as the Niagara region are highly specialized for growing fruits and vegetables) and urban areas with high population densities. The "Golden Horseshoe" extending from Cobourg in the east around the western end of Lake Ontario to St. Catharines and Niagara Falls is highly urbanized and industrialized and includes Metropolitan Toronto and the industrial centre of Hamilton.

2.2 Land Use and Pollution Sources The extensive urban/industrial and rural/agricultural land use activity within the drainage area of Lake Ontario accounts for a range of pollutants entering tributaries and lakes from point sources (e.g. industrial and municipal effluent discharges) and non-point sources (e.g. diffuse runoff from urban or agricultural areas). These pollutants include suspended solids, dissolved solids, bacteria (not included in this study), nutrients, metals, and trace organic contaminants (including pesticides, PCBs, and a range of industrial organic chemical byproducts).

2 Information sources:

Lake Ontario Toxics Management Plan, A Report by the Lake Ontario Toxics Committee February 1989, Environment Canada, United States Environmental Protection Agency, Ontario Ministry of the Environment, New York State Department of Environmental Conservation.

The Great Lakes, An Environmental Atlas and Resource Book, Jointly produced by: Government of Canada and United States Environmental Protection Agency, Third Edition 1995.

The Lake Ontario Lakewide Management Plan, Stage 1: Problem Definition, Environment Canada, United States Environmental Protection Agency, Ontario Ministry of the Environment, New York State Department of Environmental Conservation, May 1998.

Figure 2.1: Population Densities in the Lake Ontario Drainage Basin Spatial and temporal trends in water quality throughout this area of the province can often be linked to shifts in land use patterns as well trends in contaminant loads from wastewater discharges.

Contaminants associated with urban runoff include polynuclear aromatic hydrocarbons (PAHs) which include benzo(a)pyrene (BaP), as well as metals and petroleum hydrocarbons. These contaminants are associated with vehicle exhaust, brake and tire wear, fuel and engine oil leaks or spills, and corrosion and are most prevalent in areas with high traffic densities. Other contaminants associated with roads and urban runoff include suspended solids, nutrients, pesticides and bacteria from sanitary sewer cross connections, infiltration from the sanitary sewer systems, accidental or deliberate spills to road side catch basins, chemical applications (fertilizers and pesticides), run off from commercial/industrial storage areas, and faecal material from wildlife and domestic animals.

Pollutants linked to rural and agricultural land uses can overlap with urban sources. Agricultural activities can contribute suspended solids from erosion and livestock access to waterways, nutrients from fertilizer and manure applications, and pesticides from run-off or drift during application. Sources of elevated bacteria can be linked to run-off from improper manure handling or inappropriate field applications, animal storage areas, faecal material from livestock. The relative impact of suspended solids, fertilizers and pesticides on rural streams can vary widely with the season and local farm practices but can be significant, particularly during the spring.

Not all pollutants are locally or recently generated. Many of the persistent trace organic compounds which are still being detected in the water, sediment, and biota of Lake Ontario and its tributaries are pesticides which have not been used in Ontario for decades, if ever. Present day sources may be hundreds or thousands of kilometres away, but deposition from long-range atmospheric transport combined with large tributary catchment areas can focus contaminants into tributary waters.

2.3 Description of Sampling Locations Six tributaries in the Canadian portion of the Lake Ontario watershed were sampled over the period July 1997 to March 1998. These were: the Credit River, the Humber River, the Ganaraska River, the Trent River, Twenty Mile Creek, and Twelve Mile Creek (Figure 2.2). These tributaries were selected in order to cover the range of land use, watershed size, and average flows within the Lake Ontario drainage basin. Access to flow monitoring data and the potential for vandal-proof installation of automatic sampling equipment were other factors considered in the selection of tributaries and siting of sampling installations.

A summary of sampling locations, drainage basin areas, and annual average flows is presented in Table 2.1 to illustrate the range of tributary sizes covered by this study, and to provide an indication of the proportion of drainage basin area and flow from Ontario tributaries covered by the 1997/98 sampling program..

The large annual average flows from Twelve Mile Creek and the Trent River, and the extremely large drainage area associated with the Trent watershed, mean that the tributaries selected for sampling in 1997/98 cover approximately 80% of the Ontario tributary flows (excluding the Niagara River), and about 50 % of the Ontario watershed area.

Watershed Boundary Trent River Ganaraska River Humber River Credit River N

Twelve Mile Creek W E Twenty Mile Creek S 50 0 50 100 Kilometres Figure 2.2: 1997/98 Tributary Toxics Monitoring Locations Table 2.1: Summary of Sampling Locations, Drainage Basin Areas, and Annual Average Flows for 1997/98 Tributary Sampling Tributary Station Latitude Longitude Approx. Annual Description Area Flow (km 2) (m3 s-1)

Credit River Mississauga Golf and Country Club 43 0 32.574 79 0 38.002 650 6.9 0 0 Humber Lawrence Ave. (first two samples) 43 37.849 79 28.232 900 6.2 Old Mill Road (subsequent samples)

Ganaraska Sylvan Glen Road 43 0 59.444 78 0 19.695 250 3.2 Trent South of Hwy. 401 (500 m) 44 0 07.476 77 0 35.513 12700 142 Twenty Mile Creek Balls Falls 43 0 08.014 79 0 22.588 300 3 Twelve Mile Creek South end of Martindale Pond 43 0 11.913 79 0 15.933 N.A.* 189 Totals 14800 353.3

3. SURVEY METHODS 3.1 Field Methods Large-volume water sample were collected using ISCO automatic samplers with Teflon-lined polyethylene tubing intake lines to minimize contamination of samples. The intake lines were connected to stainless steel pre-filters situated at mid-depth and in the main flow of the tributary.

The ISCO samplers were modified to split the flow from the sampler distribution arm into three stainless steel 19 litre containers. Two of the containers were prepared for trace organics analysis by the Environment Canada National Laboratory for Environmental Testing (NLET) using a modification of the protocol previously established for Great Lakes samples. The third sample container, which was used for trace metals, major ions and nutrients analyses, was fitted with a disposable laboratory grade polyethylene bag liner for submission to the MOE Laboratory Services Branch (LSB).

Sample containers were cleaned and prepared, and samples were handled and delivered, using standard protocols designed to minimize sample contamination and degradation. The use of sample blanks and spiked samples further ensured accuracy of the results.

At sites which were co-located with stream flow gauging stations, sampling was triggered by the stream gauge using programmed set-points. Sampling for other sites involved either on-site or project personnel collecting samples in response to events and flow information from remotely accessed stream gauges. Sampling targeted a range of flows covering base-flow levels as well as rainfall events and peak spring flows based on hydrograph data. At Twelve Mile Creek, however, where high flows from Lake Erie are uniformly controlled for power generation and where the influence of runoff from the local drainage basin is extremely small, event sampling was coordinated with nearby Twenty Mile Creek.

3.2 Laboratory Methods Samples were analysed for a range of trace contaminants and conventional pollutants. These included organochlorine pesticides, total polychlorinated biphenyls (total PCBs as represented by a suite of 103 congeners or congener groupings), and polynuclear aromatic hydrocarbon compounds (PAHs). Trace metals (Al, Cr, Cd, Cu, Fe, Hg, Mn, Ni, Pb, Zn) and selected major ions and nutrients were also included. Bacteriological analyses were not carried out as part of this study.

Sample preparation of trace organic samples (two 19 litre containers) involved centrifugation followed by liquid-liquid extraction of the supernatant and extraction of the solid phase. The two extracts were recombined for total PCB and organochlorine analysis by GC/ECD, and PAH analysis by GC/MSD at NLET. Samples from the third container were analysed for nutrients (N and P) and metals using MOE standard methods (AAS, colourimetry, ICP/MS) by the LSB.

Each sample run for PCB analysis included analysis of a laboratory blank and all reported results have been blank corrected.

Table 3.1: Summary of Detection Limits and PWQOs Table 3.2: Summary of Detection Limits and PWQOs for Trace for Trace Organics Sampled in 1997/98 Metals, Suspended Solids, and Total Phosphorus Sampled in 1997/98 Substance Detection Limit PWQO (ng/L) (ng/L) Substance Detection Limit PWQO

( µg/l ) ( µg/l )

Aldrin/dieldrin 0.05 1 Suspended Solids 500 ---

Benzo(a)pyrene 0.09 210 Total Phosphorus 4

  • 30.0 Chlordane 0.01 60 Total Kjeldahl Nitrogen 20 ---

DDT (total) 0.02 3 Aluminum (clay-free sample) 10

  • 5.0 Octachlorostyrene 0.05 ---

Iron 20 300 PCBs (total) 0.30 1 Heptachlor+Hept. Epox. 0.02 1 Lead 5

  • 5.0 Endosulphan (total) 0.03 3 Manganese 0.5 ---

Lindane (( - BHC) 0.04 10 Mercury (filtered sample) 0.02 0.2 Endrin 0.01 2 Nickel 2 25 Methoxychlor 0.04 40 Zinc 0.5

  • 20.0
  • indicates interim PWQO
4.

SUMMARY

OF SELECTED RESULTS The following summary focuses on trace organic contaminants and metals. Suspended solids and nutrients have also been included for comparison since they are routinely available pollution indicators from other monitoring programs. Given the commonly observed relationship between flow conditions and water quality, all data have been partitioned into wet and dry weather samples to ensure that among-station comparisons of contaminant concentrations are not biassed by differences in the proportion of wet (high flow) events available at each station. This partitioning was based on inspection of hydrograph data except at Twelve Mile Creek where partitioning was based on the Twenty Mile Creek sampling dates.

4.1 Comparison with PWQOs The frequencies with which water quality parameters were detected above their respective Provincial Water Quality Objectives (PWQOs) are presented in Table 4.1. No samples were detected above PWQOs for chromium, mercury, Mirex, hexachlorobenzene, benzo(a)pyrene, or any of the organochlorine pesticides (lindane, aldrin/dieldrin, chlordane, DDT, endrin, endosulfan) in either dry or wet weather samples. Total PCBs, however, were detected above the PWQO of 1.0 ng/L in all wet and dry weather samples. Cadmium, copper, iron, nickel, lead, zinc, and total phosphorus had detection frequencies greater than PWQOs ranging from 0% to 100% depending upon the location and weather.

4.2 Dry and Wet Weather Contaminant Concentrations Median concentrations for total phosphorus (TP), metals (Al, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Zn),

total PCBs, organochlorine pesticides, and the PAH benzo(a)pyrene (BaP) are summarized in Table 4.2. Selected contaminant concentration results and corresponding flow data are also presented in Figures 4.1 to 4.11.

As expected, all tributaries exhibited a pattern of wet weather median concentrations of suspended solids (SS) exceeding dry weather median concentrations. Similarly, all tributaries other than the Trent River had wet weather total Kjehdal Nitrogen (TKN) and TP medians which exceeded the dry weather medians, frequently by more than an order of magnitude. Wet weather TP concentrations exceeded the interim PWQO of 0.030 mg/L at all tributaries other than the Trent River. Twenty Mile Creeks dry weather median also exceeded the interim PWQO for TP.

With the exception of Cd and Cr, wet weather metal median concentrations also exceeded dry weather median concentrations. Median concentrations of Cd, Cu, Fe, Pb, and Zn were all detected above their respective PWQOs at two or more tributaries, generally in wet weather samples with the exception of Cd at the Ganaraska and Trent Rivers. Results for BaP showed a similar pattern to that of SS, nutrients, and metals, with wet weather median concentrations exceeding dry weather concentrations at all locations. Total PCBs were an exception to this pattern. Wet weather median concentrations of PCBs did not tend to exceed dry weather medians except at the Humber River.

Results for all other organochlorine compounds were varied, depending upon sample type and location. "-BHC, lindane ((-BHC), "-endosulfan, $-endosulfan, "-chlordane, dieldrin, p,p-DDD (a DDT metabolite), and p,p-DDT were the most frequently detected, although they were always present at concentrations well below their respective PWQOs.

The Credit River was the only sampling location having dry and wet weather median concentrations of Mirex above the detection limit (0.01 ng L-1) with values of 0.06 ng L-1 and 0.02 ng L-1 respectively; well below the PWQO of 1.0 ng/L.

TABLE 4.1: FREQUENCY OF DETECTIONS GREATER THAN PROVINCIAL WATER QUALITY OBJECTIVES (shown in parentheses)

STN WET/ N TP Cd Cr Cu Fe Hg Ni Pb Zn DRY (30 mg/L) (0.5 µg/L) (100 µg/L) (5 µg/L) (300 µg/L) (0.2 µg/L) (25 µg/L) (5 µg/L) (20 µg/L)

CREDIT DRY 8 25% 38% 0% 0% 13% 0% 0% 0% 0%

WET 6 100% 33% 0% 83% 100% 0% 50% 83% 100%

HUMBER DRY 5 40% 20% 0% 20% 20% 0% 0% 20% 20%

WET 7 86% 57% 0% 100% 100% 0% 29% 100% 100%

GANARASKA DRY 3 0% 67% 0% 0% 0% 0% 0% 0% 0%

WET 9 89% 33% 0% 0% 56% 0% 33% 0% 0%

TRENT DRY 4 25% 75% 0% 0% 0% 0% 0% 0% 0%

WET 8 13% 50% 0% 0% 0% 0% 0% 0% 0%

20 MILE CR. DRY 7 100% 14% 0% 0% 0% 0% 0% 0% 0%

WET 6 100% 17% 0% 50% 83% 0% 0% 50% 67%

12 MILE CR. DRY 6 33% 0% 0% 0% 0% 0% 0% 0% 0%

WET 6 67% 0% 0% 0% 33% 0% 0% 0% 0%

STN WET/ N TPCB ALDRIN/ LINDANE 3HEPTCHLOR 3CHLORDANE 3ENDSULFAN MIREX 3-DDT ENDRIN DRY (1 ng/L) DIELDRIN (10 ng/L) (+EPOXIDE) (60 ng/L) (3 ng/L) (1 ng/L) (3 ng/L) (2 ng/L)

(1 ng/L) (1 ng/L)

CREDIT DRY 8 100% 0% 0% 0% 0% 0% 0% 0% 0%

WET 6 100% 0% 0% 0% 0% 0% 0% 0% 0%

HUMBER DRY 5 100% 0% 0% 0% 0% 0% 0% 0% 0%

WET 7 100% 0% 0% 0% 0% 0% 0% 0% 0%

GANARASKA DRY 3 100% 0% 0% 0% 0% 0% 0% 0% 0%

WET 9 100% 0% 0% 0% 0% 0% 0% 0% 0%

TRENT DRY 4 100% 0% 0% 0% 0% 0% 0% 0% 0%

WET 8 100% 0% 0% 0% 0% 0% 0% 0% 0%

20 MILE CR. DRY 7 100% 0% 0% 0% 0% 0% 0% 0% 0%

WET 6 100% 0% 0% 0% 0% 0% 0% 0% 0%

12 MILE CR. DRY 6 100% 0% 0% 0% 0% 0% 0% 0% 0%

WET 6 100% 0% 0% 0% 0% 0% 0% 0% 0%

STN WET/ N BaP HCB MTHXYCHLOR DRY (210 ng/L) (6.5 ng/L) (40 ng/L)

CREDIT DRY 8 0% 0% 0%

WET 6 0% 0% 0%

HUMBER DRY 5 0% 0% 0%

WET 7 0% 0% 0%

GANARASKA DRY 3 0% 0% 0%

WET 9 0% 0% 0%

TRENT DRY 4 0% 0% 0%

WET 8 0% 0% 0%

20 MILE CR. DRY 7 0% 0% 0%

WET 6 0% 0% 0%

12 MILE CR. DRY 6 0% 0% 0%

WET 6 0% 0% 0%

TABLE 4.2:

SUMMARY

OF MEDIAN FLOWS AND CONCENTRATIONS STN WET/ N FLOW SUSP.SOL TKN TP Al Cd Cr Cu Fe Mn Ni Pb DRY (CMS) (mg/L) (mg/L) (mg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L)

CREDIT DRY 8 3.59 6.00 0.43 0.014 59.30 0.00 4.74 2.56 93.45 10.24 0.00 0.00 WET 6 19.50 184.00 1.60 0.370 720.50 0.00 2.81 8.45 1003.00 200.5 24.36 5.63 HUMBER DRY 5 1.43 11.50 0.38 0.030 126.00 0.00 7.18 2.29 184.00 25.3 0.00 0.00 WET 7 15.23 125.00 1.16 0.250 737.00 0.22 5.91 11.30 1200.00 181.00 3.85 8.71 GANARASKA DRY 3 1.77 5.00 0.22 0.012 39.20 0.26 5.55 0.51 64.40 14.80 0.00 0.00 WET 9 7.15 60.50 0.96 0.110 218.00 0.00 3.28 1.30 411.00 68.60 0.00 0.00 TRENT DRY 4 45.90 2.00 0.45 0.024 12.60 0.53 3.43 0.65 27.80 11.25 0.00 0.00 WET 8 175.35 4.25 0.46 0.017 19.40 0.13 1.54 0.77 59.00 10.28 0.00 0.00 20 MILE CR. DRY 7 0.08 4.00 0.72 0.086 77.30 0.00 3.53 1.44 92.90 52.60 2.90 0.00 WET 6 30.65 194.00 2.35 0.760 1415.00 0.00 1.97 5.10 1105.00 123.70 4.43 2.87 12 MILE CR. DRY 6 213.80 7.75 0.26 0.025 88.85 0.00 2.68 1.35 98.10 8.55 0.00 0.00 WET 6 215.51 13.00 0.34 0.061 216.50 0.00 0.78 1.87 217.00 13.95 3.09 0.00 STN WET/ N FLOW Zn PCB BaP TPAH "-BHC LINDANE HPTCHLR ALDRIN HPTCHLR (- "-

DRY (CMS) (µg/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) EPOXIDE CHLRDNE ENDOSUL (ng/L) (ng/L) FAN(ng/L)

CREDIT DRY 8 3.59 5.72 4.2 0.66 22.25 0.06 0.15 0.00 0.00 0.03 0.00 0.03 WET 6 19.50 31.10 2.9 5.36 119.20 0.28 0.36 0.00 0.00 0.01 0.00 0.22 HUMBER DRY 5 1.43 4.54 4.2 1.03 32.70 0.13 0.10 0.00 0.00 0.00 0.00 0.04 WET 7 15.23 43.80 5.4 22.15 271.06 0.39 0.29 0.00 0.00 0.02 0.02 0.17 GANARASKA DRY 3 1.77 1.32 3.5 0.09 8.17 0.00 0.00 0.00 0.00 0.00 0.00 0.00 WET 9 7.15 5.06 3.2 0.15 18.05 0.17 0.09 0.00 0.00 0.00 0.00 0.03 TRENT DRY 4 45.90 2.75 4.1 0.05 5.46 0.09 0.10 0.00 0.00 0.00 0.00 0.01 WET 8 175.35 2.72 4.4 0.00 11.88 0.17 0.13 0.00 0.00 0.00 0.00 0.01 20 MILE CR. DRY 7 0.08 4.28 4.2 0.00 11.97 0.07 0.09 0.00 0.00 0.00 0.00 0.02 WET 6 30.65 28.30 2.4 0.34 25.69 0.32 0.36 0.00 0.00 0.02 0.00 0.12 12 MILE CR. DRY 6 213.80 1.63 6.4 0.23 13.17 0.27 0.28 0.00 0.00 0.03 0.00 0.03 WET 6 215.51 4.26 5.6 0.37 19.56 0.34 0.26 0.00 0.00 0.05 0.00 0.03 STN WET/ N FLOW "-CHLRDN DIELDRIN p,p-DDE ENDRIN $- p,p-DDD o,p-DDT p,p-DDT MTHXY MIREX HCB DRY (CMS) (ng/L) (ng/L) (ng/L) (ng/L) ENDSLFN (ng/L) (ng/L) (ng/L) CHLR (ng/L) (ng/L)

(ng/L) (ng/L)

CREDIT DRY 8 3.59 0.03 0.10 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.06 0.02 WET 6 19.50 0.02 0.06 0.00 0.00 0.20 0.02 0.00 0.07 0.00 0.02 0.03 HUMBER DRY 5 1.43 0.04 0.10 0.00 0.00 0.04 0.00 0.00 0.00 0.00 0.00 0.01 WET 7 15.23 0.04 0.07 0.00 0.00 0.12 0.03 0.00 0.00 0.00 0.00 0.03 GANARASKA DRY 3 1.77 0.00 0.15 0.00 0.00 0.00 0.00 0.00 0.21 0.00 0.00 0.01 WET 9 7.15 0.00 0.20 0.00 0.00 0.03 0.05 0.00 0.14 0.00 0.00 0.02 TRENT DRY 4 45.90 0.01 0.03 0.00 0.00 0.02 0.00 0.00 0.01 0.00 0.00 0.02 WET 8 175.35 0.00 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 20 MILE CR. DRY 7 0.08 0.01 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 WET 6 30.65 0.00 0.06 0.00 0.00 0.12 0.01 0.00 0.10 0.00 0.00 0.03 12 MILE CR. DRY 6 213.80 0.02 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 WET 6 215.51 0.01 0.13 0.00 0.00 0.06 0.04 0.00 0.12 0.00 0.00 0.02 Note: Shaded Value Indicates Concentration Greater Than PWQO; 0.00" Indicates Not Detected SUSPENDED SOLIDS (MG/L) FLOW (CMS)

C C R R ED ED IT IT D D R 1 10 100 1000 R 0.001 0.01 0.1 1 10 100 1000 Y Y C (N C (N R =8 R =8 ED ) ED )

IT IT W W ET ET H (N H (N U =6 U =6 M ) M )

BE BE R R D D R R Y Y H (N H (N U U M =4

) M =4

)

BE BE R R W W G ET G ET AN AN AR (N AR (N

=8 =8 AS ) AS )

KA KA G D G D R R AN Y AN Y AR (N AR (N

=3 =3 AS ) AS )

KA KA W W ET ET (N (N TR =9 TR =9 EN ) EN ) T T D D R R Y Y (N (N TR =4 TR =4 EN ) EN )

T T TW W TW W ET ET EN EN FLOW: RANGE AND MEDIANS TY (N TY (N

=8 =8 M ) M )

IL IL E E TW D TW D R R EN Y EN Y TY (N TY (N

=7 =7 M ) M )

IL IL E E TW W TW W ET ET EL (N EL (N VE =6 VE =6 M ) M )

IL IL E E D D SUSPENDED SOLIDS CONCENTRATIONS: RANGE AND MEDIANS TW TW R R EL Y EL Y VE (N VE (N

=6 =6 M ) M )

IL IL E E Figure 4.1: Range of Daily Flows Corresponding to 1997/98 Sampling Episodes W W Figure 4.2: Range of Suspended Solids Concentrations Sampled During 1997/98 ET ET (N (N

=6 =6

) )

COPPER (UG/L) TOTAL P (UG/L)

C C R R ED ED IT IT D D R 0 1 10 100 R 1 10 100 1000 Y Y C (N C (N R =8 R =8 ED ) ED )

IT IT W W ET ET H (N H (N U =6 U =6 M ) M )

BE BE R R D D R R Y Y H (N H (N U U M =4

) M =4

)

BE BE R R W W G ET G ET AN AN AR (N AR (N

=8 =8 AS ) AS )

KA KA G D G D R R AN Y AN Y AR (N AR (N

=3 =3 AS ) AS )

KA KA W W ET ET (N (N TR =9 TR =9 EN ) EN ) T T D D R R Y Y (N (N TR =4 TR =4 EN ) EN )

T T TW W TW W ET ET EN EN TY (N TY (N

=8 =8 M ) M )

IL IL E E TW D TW D R R Y Y (PWQO = 5.0 UG/L)

EN EN TY (N TY (N

=7 =7 M ) M )

IL IL E E TW W TW W COPPER CONCENTRATIONS: RANGE AND MEDIANS ET ET EL (N EL (N VE =6 VE =6 M ) M )

IL IL E E TW D TW D R R TOTAL PHOSPHORUS CONCENTRATIONS: RANGE AND MEDIANS EL Y EL Y (PWQO = 30 UG/L)

VE (N VE (N

=6 =6 Figure 4.4: Range of Copper Concentrations Sampled During 1997/98 M ) M )

IL IL E E W W Figure 4.3: Range of Total Phosphorus Concentrations Sampled During 1997/98 ET ET (N (N

=6 =6

) )

BaP (NG/L) ZINC (UG/L)

C C R R ED ED IT IT D D R 0 1 10 100 1000 R 0 1 10 100 Y Y C (N C (N R =8 R =8 ED ) ED )

IT IT W W ET ET H (N H (N U =6 U =6 M ) M )

BE BE R R D D R R Y Y H (N H (N U U M =4

) M =4

)

BE BE R R W W G ET G ET AN AN AR (N AR (N

=8 =8 AS ) AS )

KA KA Figure 4.6: Range of Benzo(a)pyrene Concentrations Sampled During 1997/98 G D G D R R AN Y AN Y AR (N AR (N

=3 =3 AS ) AS )

KA KA W W ET ET (N (N TR =9 TR =9 EN ) EN ) T T D D R R Y Y (N (N TR =4 TR =4 EN ) EN )

T T TW W TW W ET ET EN EN (PWQO = 210 ng/L)

TY (N TY (N

=8 =8 M ) M )

IL IL E E TW D TW D R R EN Y EN Y TY (N TY (N

=7 =7 M ) M )

(PWQO = 20 UG/L)

IL IL E E BaP CONCENTRATIONS: RANGE AND MEDIANS ZINC CONCENTRATIONS: RANGE AND MEDIANS Figure 4.5: Range of Zinc Concentrations Sampled During 1997/98 TW W TW W ET ET EL (N EL (N VE =6 VE =6 M ) M )

IL IL E E TW D TW D R R EL Y EL Y VE (N VE (N

=6 =6 M ) M )

(missing points are due to values below detection limit)

IL IL E E W W ET ET (N (N

=6 =6

) )

TOTAL PCBS (NG/L) LINDANE (NG/L)

C C R R ED ED IT IT D D R 0 1 10 100 R 0.0 0.1 1.0 10.0 Y Y C (N C (N R =8 R =8 ED ) ED )

IT IT W W ET ET H (N H (N U =6 U =6 M ) M )

BE BE R R D D R R Y Y H (N H (N U U M =4

) M =4

)

BE BE R R W W G ET G ET AN AN (N (N Figure 4.7: Range of Lindane Concentrations Sampled During 1997/98 AR =8 AR =8 AS ) AS )

KA KA G D G D R R AN Y AN Y AR (N AR (N

=3 =3 AS ) AS )

KA KA W W ET ET (N (N TR =9 TR =9 EN ) EN ) T T D D R R Y Y (N (N TR =4 TR =4 (PWQO = 10 NG/L)

EN ) EN )

T T TW W TW W ET ET EN EN TY (N TY (N

=8 =8 M ) M )

IL IL E E TW D TW D R R EN Y EN Y TY (N TY (N

=7 =7 M ) M )

(PWQO = 1.0 NG/L)

IL IL E E TW W TW W ET ET LINDANE CONCENTRATIONS: RANGE AND MEDIANS EL (N EL (N TOTAL PCB CONCENTRATIONS: RANGE AND MEDIANS VE VE (missing points are due to values below detection limit)

=6 =6 M ) M )

IL IL Figure 4.8: Range of Total PCB Concentrations Sampled During 1997/98 E E TW D TW D R R EL Y EL Y VE (N VE (N

=6 =6 M ) M )

IL IL E E W W ET ET (N (N

=6 =6

) )

-BHC (NG/L) ALDRIN/DIELDRIN (NG/L)

C C R R ED ED IT IT D D R 0.01 0.10 1.00 10.00 R 0.01 0.10 1.00 10.00 Y Y (N C (N C R R =8 =8

)

ED ) ED IT IT W W ET ET H (N H (N U U =6 M =6

) M )

BE BE R R D D R R Y Y H (N H (N U U M =4 M =4

)

BE ) BE R R W W G ET G ET AN AN AR (N AR (N

=8 =8 AS ) AS )

KA KA G D G D R R AN Y AN Y AR (N AR (N

=3 =3 AS ) AS )

KA KA W W ET ET Figure 4.10: Range of "-

" BHC Concentrations Sampled During 1997/98 (N (N TR =9 TR =9 EN ) EN ) T T D D R R Y Y (N (N TR =4 TR =4 EN ) EN )

T T TW W TW W ET ET EN EN TY (N TY (N

=8 =8 M ) M )

IL IL E E TW D TW D R R EN Y EN Y TY (N TY (N

=7 =7 M ) M )

IL IL E E W W

- BHC CONCENTRATIONS: RANGE AND MEDIANS TW ET TW ET EL (N EL (N (PWQO = 1 NG/L)

VE =6 VE =6 M ) M )

IL IL ALDRIN/DIELDRIN CONCENTRATIONS: RANGE AND MEDIANS E E TW D TW D R R EL Y EL Y VE (N VE (N

=6 =6 M ) M )

IL IL E E (missing points are due to values below detection limit)

W W ET ET (N (N

=6 =6

) )

Figure 4.9: Range of Aldrin/Dieldrin Concentrations Sampled During 1997/98

HCB (ng/L)

C R

ED IT D 0.00 0.01 0.10 1.00 10.00 R

Y (N

C R =8

)

ED IT W

ET H (N U =6 M )

BE R

D R

Y H (N U =4 M )

BE R

W G ET AN AR (N

=8 AS )

KA D

G R AN Y AR (N

=3 AS )

KA W

ET (N

=9 TR )

EN T D

R Y

(N TR =4 EN )

T TW W ET EN TY (N

=8 M )

IL E

TW D R

EN Y TY (N

=7 M )

PWQO = 6.5 ng/L IL E

HCB CONCENTRATIONS: RANGE AND MEDIANS TW W ET EL (N VE =6 M )

IL E

D TW R EL Y Figure 4.11: Range of HCB Concentrations Sampled During 1997/98 VE (N

=6 M )

IL E

W ET (N

=6

)

5. CONCLUSIONS AND RECOMMENDATIONS
1. The similarity in ranges of total PCB concentrations across the range of land use types at monitored watersheds suggests a relatively uniform tributary background for the Lake Ontario drainage basin which may be attributable to both atmospheric deposition of PCBs and its ubiquitous presence at sites throughout the drainage basin. Further analysis of available PCB congener group data, additional event-based sampling, and examination of sediment, tissue, and atmospheric data will be required to estimate the relative significance of local sources contributing to the pervasive detection of total PCBs at concentrations greater than 1.0 ng/L in these six Lake Ontario watersheds 3 ;
2. Although concentrations of total DDT are well below the PWQO of 3.0 ng/L, the frequent detection of the p,p-DDT isomer across all monitored tributaries, particularly at the Ganaraska, implies that there may still be local sources of DDT within these drainage basins.

These low concentrations may reflect the current use of the organochlorine pesticide Dicofol which is manufactured from DDT (technical grade Dicofol contains less than 0.1% DDT) and which is used on a wide variety of fruit, vegetable, ornamental and field crops. It may also reflect soil residues from legal applications of DDT since detection of DDT in soil does not necessarily indicate new use 4. The need for source identification must be weighed against the extremely low concentrations being measured since further sampling, and examination of sediment, tissue, and atmospheric data would be required to estimate the relative significance of local sources;

3. The elevated median concentrations of mirex at the Credit River resulted from the higher frequency of detection at this location relative to other tributaries, and may be indicative of a historical source in this watershed. Juvenile fish monitoring by MOE in the late 1970s showed mirex concentrations at the mouth of Credit River to be slightly higher than at other tributary mouths in western Lake Ontario, however sampling since 1993 has yielded no results above the detection limit at this location, and even the maximum tributary concentrations remained below the PWQO of 1.0 ng/L;
4. The influence of highways, urban land use and high population density is apparent with median concentrations of the BaP, Cu, Pb, and Zn at the Credit River and Humber River markedly greater than those at other sampling locations;
5. An optimal survey design (e.g. sampling frequency, spatial distribution, list of contaminants) for future monitoring will vary depending upon specific objectives and associated data requirements. For this reason follow-up monitoring plans must be based on a thorough discussion of information needs. Priorities could include track down monitoring, improved event-based sampling for loading calculations, or an improved analysis of the relationships between land use and contaminant types.

3 It should be noted that trend data from Lake Ontario juvenile forage fish and sportfish monitoring indicate that exposure in the nearshore waters of Lake Ontario has declined by more than 80% over the past twenty years, and open-lake water quality data from the USEPA indicate ambient concentrations consistently below the PWQO of 1.0 ng/L 4

California Department of Food and Agriculture 1985: Agricultural Sources of DDT residues in Californias Environment.

APPENDIX A-1:

Data Listing for Station 89 Credit River APPENDIX A-1: Data Listing for the Credit River STN# DATE TIME FLOW (CMS) SS(MG/L) TKN(MG/L) TP(MG/L) AL(UG/L) CD(UG/L) CR(UG/L) 89 970724 915 3.69 4.0 0.400 0.014 70 2.3 6.1 89 970810 1045 3.30 4.0 0.380 0.014 46 nd 5.8 89 970916 0 3.49 2.5 0.440 0.008 32 nd 5.3 89 970916 1430 3.49 2.0 0.400 0.008 21 nd 4.4 89 970920 1115 6.07 81.0 0.700 0.076 324 1.2 2.5 89 970925 1600 3.78 8.0 0.520 0.014 101 0.2 3.9 89 971015 1515 3.30 13.0 0.420 0.016 48 nd 1.4 89 971027 1145 11.38 341.0 3.300 0.470 717 0.3 16.0 89 971121 1600 6.48 18.0 0.560 0.036 85 nd 5.0 89 980108 1230 22.50 208.0 1.900 0.440 959 nd 5.4 89 980219 1430 10.20 160.0 1.400 0.350 1150 nd 4.2 89 980310 1115 23.50 149.0 1.560 0.296 498 nd 0.7 89 980319 1349 16.50 255.0 1.600 0.350 724 0.2 1.4 89 980327 1115 37.70 76.5 1.600 0.390 690 nd 0.9 STN# DATE TIME CU(UG/L) FE(UG/L) MN(UG/L) NI(UG/L) PB(UG/L) ZN(UG/L) TPCB(NG/L) 89 970724 915 2.3 81.9 12.30 nd nd 6.0 7.0 89 970810 1045 2.0 56.3 6.64 nd nd 2.3 2.1 89 970916 0 4.2 44.7 3.20 nd nd 5.4 4.1 89 970916 1430 2.1 35 2.79 nd nd 2.8 4.2 89 970920 1115 4.6 419 66.10 nd nd 14.0 4.1 89 970925 1600 2.8 105 8.18 nd nd 6.0 3.4 89 971015 1515 2.2 128 15.80 nd nd 2.9 6.3 89 971027 1145 17.5 966 580.00 3 9 60.0 3.6 89 971121 1600 4.9 180 33.90 nd nd 9.4 5.2 89 980108 1230 7.8 1110 270.00 3 5 27.9 4.8 89 980219 1430 9.1 1140 169.00 6 6 33.6 4.1 89 980310 1115 4.8 862 131.00 43 nd 20.5 1.4 89 980319 1349 9.2 917 143.00 46 7 52.3 2.3 89 980327 1115 6.9 1040 232.00 51 5 28.6 2.2 NOTE: unfiltered total mercury results were all below the detection limit of 0.02 µg/L and have not been included in this table wet weather flows are shown in bold APPENDIX A-1: Data Listing for the Credit River STN# DATE TIME BAP (NG/L) TPAH(NG/L) a-BHC(NG/L) LINDANE HEPTACHLR ALDRIN HPTCHLR (NG/L) (NG/L) (NG/L) EPXDE(NG/L) 89 970724 915 0.56 26.9 0.15 0.27 nd nd 0.12 89 970810 1045 0.27 13.0 nd nd nd nd nd 89 970916 0 nd 16.2 0.01 0.05 nd nd 0.02 89 970916 1430 0.23 11.4 nd 0.15 nd nd 0.04 89 970920 1115 6.63 154.8 0.24 0.29 nd nd 0.05 89 970925 1600 1.09 231.5 0.13 0.16 nd nd 0.04 89 971015 1515 0.75 22.5 nd 0.17 nd nd nd 89 971027 1145 4.35 67.0 0.21 nd nd nd nd 89 971121 1600 0.75 22.0 0.10 0.11 nd nd 0.01 89 980108 1230 5.54 129.2 0.32 0.42 nd nd 0.03 89 980219 1430 5.17 123.0 0.33 0.37 nd nd 0.03 89 980310 1115 2.04 48.4 0.12 0.29 nd nd nd 89 980319 1349 13.3 404.5 0.45 0.35 nd nd 0.02 89 980327 1115 6.04 115.4 0.24 0.46 nd nd nd STN# DATE TIME g-CHLRDNE a-ENDSLFN a-CHLRDNE DIELDRIN p,p-DDE ENDRIN b-ENDSLFN (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) 89 970724 915 0.13 0.03 0.11 0.26 nd 0.22 0.08 89 970810 1045 nd nd 0.17 nd nd nd nd 89 970916 0 nd 0.01 0.01 0.09 nd nd nd 89 970916 1430 nd 0.04 0.01 0.10 nd nd nd 89 970920 1115 0.03 0.40 0.05 0.12 nd nd 0.24 89 970925 1600 nd 0.08 0.02 0.07 nd nd 0.06 89 971015 1515 nd nd 0.05 0.10 nd nd nd 89 971027 1145 nd nd nd 0.05 nd nd 0.04 89 971121 1600 nd 0.03 0.02 nd nd nd nd 89 980108 1230 0.03 0.36 0.03 0.07 0.02 nd 0.29 89 980219 1430 nd 0.69 0.01 0.06 0.04 nd 0.46 89 980310 1115 nd 0.07 0.02 0.04 nd nd 0.11 89 980319 1349 nd 0.28 0.02 0.05 nd nd 0.25 89 980327 1115 nd 0.17 0.03 0.10 nd nd 0.15 APPENDIX A-1: Data Listing for the Credit River STN# DATE TIME p,p-DDD o,p-DDT p,p-DDT MTHXYCHLR MIREX HCB OCS (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) 89 970724 915 0.56 nd 0.54 nd 0.35 0.17 nd 89 970810 1045 nd nd nd nd nd nd nd 89 970916 0 nd nd nd nd 0.01 0.01 nd 89 970916 1430 0.02 nd 0.00 nd 0.01 0.02 nd 89 970920 1115 0.05 nd 0.05 nd 0.69 0.02 nd 89 970925 1600 0.01 nd nd nd 0.03 0.02 nd 89 971015 1515 0.02 nd nd nd 0.08 0.03 nd 89 971027 1145 0.08 nd nd nd 0.18 0.04 nd 89 971121 1600 0.05 nd nd nd 0.09 0.02 nd 89 980108 1230 0.04 nd 0.08 0.11 0.02 0.03 nd 89 980219 1430 0.02 nd 0.07 nd nd 0.03 nd 89 980310 1115 nd nd nd nd nd 0.02 nd 89 980319 1349 nd nd 0.09 0.13 0.01 0.04 nd 89 980327 1115 0.03 nd 0.08 nd 0.02 0.02 nd APPENDIX A-2:

Data Listing for Station 90 Humber River APPENDIX A-2: Data Listing for the Humber River STN# DATE TIME FLOW (CMS) SS(MG/L) TKN(MG/L) TP(MG/L) AL(UG/L) CD(UG/L) CR(UG/L) 90 970724 1230 1.47 16.50 0.36 0.04 126.00 nd 7.18 90 970809 1700 1.20 7.50 0.34 0.03 60.00 nd 5.99 90 970821 1020 8.25 125.00 1.16 0.20 633.00 0.3 5.95 90 970908 1230 1.97 11.50 0.54 0.03 164.00 nd 4.63 90 970910 1330 5.01 153.00 0.62 0.07 801.00 0.3 8.00 90 971016 1115 1.39 9.00 0.38 0.01 38.30 nd 9.26 90 971027 1330 7.63 84.00 1.00 0.18 592.00 nd 5.91 90 971121 1530 3.23 23.50 0.34 0.02 331.00 nd 2.60 90 980108 1311 22.30 118.00 1.10 0.25 1090.00 nd 6.17 90 980219 1220 62.60 495.00 2.50 0.79 1530.00 0.2 22.40 90 980319 1455 42.90 239.00 1.44 0.34 737.00 0.6 2.75 90 980327 1230 59.50 849.00 2.50 0.92 1070.00 0.2 1.16 STN# DATE TIME CU(UG/L) FE(UG/L) MN(UG/L) NI(UG/L) PB(UG/L) ZN(UG/L) TPCB(NG/L) 90 970724 1230 2.10 184 28.90 nd nd 4.54 5.3 90 970809 1700 1.74 124 24.00 nd nd 2.65 1.4 90 970821 1020 13.90 1200 189.00 4 10 57.20 9.1 90 970908 1230 3.49 272 25.30 2 nd 6.76 4.2 90 970910 1330 18.70 1840 227.00 5 17 66.00 23.3 90 971016 1115 2.29 151 13.90 nd nd 3.56 3.7 90 971027 1330 9.30 1250 135.00 3 7 36.20 5.1 90 971121 1530 11.30 573 68.40 3 7 30.50 5.4 90 980108 1311 10.70 1850 181.00 4 9 43.80 7.1 90 980219 1220 14.10 2840 402.00 11 11 46.40 9.8 90 980319 1455 17.70 950 119.00 54 20 97.10 5.4 90 980327 1230 9.24 1190 322.00 84 6 35.90 3.1 NOTE: unfiltered total mercury results were all below the detection limit of 0.02 µg/L and have not been included in this table wet weather flows are shown in bold APPENDIX A-2: Data Listing for the Humber River STN# DATE TIME BAP (NG/L) TPAH(NG/L) a-BHC(NG/L) LINDANE HEPTACHLR ALDRIN HPTCHLR (NG/L) (NG/L) (NG/L) EPXDE(NG/L) 90 970724 1230 1.24 42.8 0.12 0.10 nd nd nd 90 970809 1700 0.75 29.9 nd nd nd nd nd 90 970821 1020 30.7 498.9 0.25 0.40 nd nd 0.06 90 970908 1230 1.89 32.7 0.21 0.32 nd nd 0.01 90 970910 1330 98.7 1303.8 0.35 0.30 nd nd nd 90 971016 1115 0.81 13.0 0.13 nd nd nd 0.02 90 971027 1330 5.50 146.2 0.88 nd nd nd nd 90 971121 1530 6.20 187.8 0.38 0.34 nd nd 0.02 90 980108 1311 11.41 271.1 0.42 0.22 nd nd 0.03 90 980219 1220 32.4 532.7 0.39 0.28 nd nd 0.02 90 980319 1455 97.5 1878.7 0.45 0.31 nd nd 0.07 90 980327 1230 13.6 255.8 0.21 0.29 nd nd nd STN# DATE TIME g-CHLRDNE a-ENDSLFN a-CHLRDNE DIELDRIN p,p-DDE ENDRIN b-ENDSLFN (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) 90 970724 1230 nd 0.10 0.04 0.13 nd nd 0.04 90 970809 1700 nd nd 0.05 nd nd nd nd 90 970821 1020 0.09 0.41 0.15 0.18 nd nd 0.44 90 970908 1230 0.05 0.04 0.03 0.08 nd nd nd 90 970910 1330 0.44 0.69 0.44 0.44 nd nd 0.64 90 971016 1115 nd 0.04 0.04 0.10 nd nd 0.06 90 971027 1330 0.01 0.42 0.03 0.06 nd nd 0.38 90 971121 1530 0.02 0.05 nd 0.04 nd 0.04 0.02 90 980108 1311 0.04 0.24 0.04 0.11 0.01 nd 0.24 90 980219 1220 0.02 0.15 0.05 0.06 0.03 nd nd 90 980319 1455 0.09 0.17 0.14 0.09 nd nd nd 90 980327 1230 nd 0.10 nd 0.07 nd nd 0.12 APPENDIX A-2: Data Listing for the Humber River STN# DATE TIME p,p-DDD o,p-DDT p,p-DDT MTHXYCHLR MIREX HCB OCS (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) 90 970724 1230 nd nd nd nd nd 0.03 nd 90 970809 1700 nd nd nd nd nd nd nd 90 970821 1020 0.30 nd nd nd nd 0.05 nd 90 970908 1230 nd nd 0.03 nd nd 0.01 nd 90 970910 1330 nd nd nd nd nd 0.05 nd 90 971016 1115 nd nd nd nd nd 0.01 nd 90 971027 1330 0.03 nd nd nd nd 0.03 nd 90 971121 1530 nd nd nd nd nd 0.03 nd 90 980108 1311 nd nd 0.02 nd nd 0.03 nd 90 980219 1220 0.10 nd 0.10 nd nd 0.23 nd 90 980319 1455 0.11 nd 0.31 0.11 nd 0.06 nd 90 980327 1230 0.01 nd nd nd nd 0.02 nd APPENDIX A-3:

Data Listing for Station 91 Ganaraska River APPENDIX A-3: Data Listing for the Ganaraska River STN# DATE TIME FLOW (CMS) SS(MG/L) TKN(MG/L) TP(MG/L) AL(UG/L) CD(UG/L) CR(UG/L) 91 970724 1500 1.77 4.00 0.24 0.03 41.10 0.3 6.43 91 970809 1400 1.62 5.00 0.22 0.01 36.80 nd 5.55 91 970911 1100 5.05 36.50 0.66 0.09 127.00 0.9 5.12 91 970929 1400 7.15 28.50 0.46 0.05 105.00 0.9 4.02 91 971020 1540 2.11 5.00 0.22 0.01 39.20 0.3 4.56 91 971029 1520 7.60 60.50 0.60 0.08 218.00 0.2 0.73 91 971121 1400 4.08 17.50 0.36 0.03 69.60 nd 15.80 91 980108 336 19.20 127.00 1.44 0.30 567.00 nd 3.28 91 980219 1355 8.62 72.50 0.96 0.15 397.00 nd 16.40 91 980310 1320 7 (est.) 134.00 1.16 0.31 456.00 nd 0.70 91 980320 1330 6.76 33.50 1.16 0.11 10.00 nd 1.97 91 980327 1030 16.50 108.00 1.36 0.30 557.00 nd 0.71 STN# DATE TIME CU(UG/L) FE(UG/L) MN(UG/L) NI(UG/L) PB(UG/L) ZN(UG/L) TPCB(NG/L) 91 970724 1500 0.51 47.3 14.80 nd nd 1.62 5.6 91 970809 1400 0.50 64.4 13.60 nd nd 1.21 2.1 91 970911 1100 1.30 236 46.80 nd nd 2.81 11.2 91 970929 1400 2.01 196 51.10 nd nd 6.15 3.4 91 971020 1540 0.82 102 15.50 nd nd 1.32 3.5 91 971029 1520 1.07 411 68.60 nd nd 3.39 1.7 91 971121 1400 0.50 149 26.40 nd nd 1.18 3.4 91 980108 336 1.61 553 143.00 nd nd 5.96 5.1 91 980219 1355 1.30 611 79.10 4 nd 5.06 3.2 91 980310 1320 1.62 779 90.20 38 nd 9.68 ---

91 980320 1330 0.67 20 0.50 37 nd 1.07 1.1 91 980327 1030 1.82 730 117.00 37 nd 10.80 2.3 NOTE: unfiltered total mercury results were all below the detection limit of 0.02 µg/L and have not been included in this table wet weather flows are shown in bold APPENDIX A-3: Data Listing for the Ganaraska River STN# DATE TIME BAP (NG/L) TPAH(NG/L) a-BHC(NG/L) LINDANE HEPTACHLR ALDRIN HPTCHLR (NG/L) (NG/L) (NG/L) EPXDE(NG/L) 91 970724 1500 0.09 12.0 0.05 0.04 nd nd nd 91 970809 1400 0.12 8.2 nd nd nd nd nd 91 970911 1100 0.37 57.2 0.06 0.08 nd nd nd 91 970929 1400 0.19 6.5 0.04 0.09 nd nd nd 91 971020 1540 nd 2.1 nd nd nd nd nd 91 971029 1520 nd 10.5 0.19 0.12 nd nd nd 91 971121 1400 0.11 15.3 0.07 nd nd nd nd 91 980108 336 0.25 20.8 0.14 0.09 nd nd 0.02 91 980219 1355 0.22 5.7 0.25 nd nd nd 0.01 91 980320 1330 nd 26.9 0.28 0.17 nd nd nd 91 980327 1030 nd 25.1 0.25 0.30 nd nd nd STN# DATE TIME g-CHLRDNE a-ENDSLFN a-CHLRDNE DIELDRIN p,p-DDE ENDRIN b-ENDSLFN (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) 91 970724 1500 nd 0.03 nd 0.17 nd nd 0.04 91 970809 1400 nd nd nd 0.15 nd nd nd 91 970911 1100 nd 0.05 nd 0.23 nd 0.01 0.07 91 970929 1400 nd 0.03 0.01 0.12 nd nd nd 91 971020 1540 nd nd 0.04 0.09 nd nd nd 91 971029 1520 nd 0.04 nd 0.07 nd nd 0.06 91 971121 1400 nd nd 0.01 0.03 nd nd nd 91 980108 336 nd nd nd 0.62 0.03 nd nd 91 980219 1355 nd 0.04 nd 0.18 0.02 nd 0.09 91 980320 1330 nd 0.05 nd 0.32 nd nd 0.08 91 980327 1030 nd nd nd 0.59 nd nd nd APPENDIX A-3: Data Listing for the Ganaraska River STN# DATE TIME p,p-DDD o,p-DDT p,p-DDT MTHXYCHLR MIREX HCB OCS (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) 91 970724 1500 0.13 nd 0.21 nd nd 0.03 nd 91 970809 1400 nd nd 0.43 nd nd nd nd 91 970911 1100 0.16 nd 0.15 nd nd 0.02 nd 91 970929 1400 0.27 nd 0.26 nd 0.01 0.02 nd 91 971020 1540 nd nd nd nd nd 0.01 nd 91 971029 1520 0.04 nd nd nd 0.01 0.01 nd 91 971121 1400 0.06 nd 0.13 nd 0.02 0.02 nd 91 980108 336 nd nd 0.57 0.04 0.00 0.01 nd 91 980219 1355 0.05 nd 0.42 nd nd 0.02 nd 91 980320 1330 0.03 nd nd nd 0.00 0.01 nd 91 980327 1030 0.06 nd nd nd nd 0.01 nd APPENDIX A-4:

Data Listing for Station 92 Trent River APPENDIX A-4: Data Listing for the Trent River STN# DATE TIME FLOW (CMS) SS(MG/L) TKN(MG/L) TP(MG/L) AL(UG/L) CD(UG/L) CR(UG/L) 92 970724 1800 28.8 1.50 0.44 0.03 14.20 nd 3.61 92 970809 1200 37.8 3.00 0.46 0.03 13.90 14.0 3.25 92 970822 1500 54.0 2.00 0.86 0.02 10.00 0.5 5.06 92 970911 1100 56.2 2.00 0.44 0.02 11.30 0.5 1.07 92 971001 1400 123.5 2.00 0.50 0.02 15.20 0.5 2.66 92 971029 1230 74.3 4.00 0.50 0.02 23.60 0.3 0.50 92 971029 1415 79.5 2.00 0.50 0.01 13.50 0.7 4.84 92 971121 0 123.7 2.00 0.42 0.01 12.80 0.9 5.05 92 980108 1700 341.0 16.50 0.60 0.06 160.00 nd 2.57 92 980303 1428 319.0 4.50 0.40 0.02 34.00 nd 0.50 92 980320 1500 227.0 11.00 0.38 0.02 12.40 nd 0.50 92 980327 1425 287.0 8.00 0.34 0.02 27.90 nd 0.50 STN# DATE TIME CU(UG/L) FE(UG/L) MN(UG/L) NI(UG/L) PB(UG/L) ZN(UG/L) TPCB(NG/L) 92 970724 1800 0.50 20 14.70 nd nd 2.43 3.6 92 970809 1200 0.64 39.4 12.60 nd nd 3.97 4.6 92 970822 1500 0.67 20 0.50 nd nd 1.90 7.3 92 970911 1100 0.75 35.6 9.89 nd nd 3.06 2.8 92 971001 1400 1.35 43.1 8.86 nd nd 3.18 4.2 92 971029 1230 1.00 81.7 19.00 nd nd 2.39 3.6 92 971029 1415 0.76 58.7 12.20 nd nd 1.81 2.8 92 971121 0 1.35 34.4 8.01 nd nd 4.18 5.3 92 980108 1700 0.78 234 48.40 nd nd 3.04 7.7 92 980303 1428 0.68 88.4 11.70 23 nd 1.61 4.6 92 980320 1500 0.67 48.2 5.10 23 nd 3.55 1.8 92 980327 1425 0.65 59.3 7.31 25 nd 1.58 5.1 NOTE: unfiltered total mercury results were all below the detection limit of 0.02 µg/L and have not been included in this table wet weather flows are shown in bold APPENDIX A-4: Data Listing for the Trent River STN# DATE TIME BAP (NG/L) TPAH(NG/L) a-BHC(NG/L) LINDANE HEPTACHLR ALDRIN HPTCHLR (NG/L) (NG/L) (NG/L) EPXDE(NG/L) 92 970724 1800 nd 5.8 0.13 0.22 nd nd 0.13 92 970809 1200 0.10 4.8 0.06 0.09 nd nd 0.01 92 970822 1500 nd 15.8 0.05 0.09 nd nd nd 92 970911 1100 0.27 5.2 0.11 0.12 nd nd nd 92 971001 1400 nd 1.6 0.14 0.11 nd nd nd 92 971029 1230 0.12 10.8 0.08 0.12 nd nd nd 92 971029 1415 nd 6.4 0.13 0.11 nd nd nd 92 971121 0 nd 6.3 0.19 0.14 nd nd nd 92 980108 1700 0.66 26.7 0.22 0.17 nd nd nd 92 980303 1428 nd 22.5 0.14 0.11 nd nd 0.01 92 980320 1500 nd 13.0 0.22 0.17 nd nd nd 92 980327 1425 0.43 21.4 0.19 0.15 nd nd nd STN# DATE TIME g-CHLRDNE a-ENDSLFN a-CHLRDNE DIELDRIN p,p-DDE ENDRIN b-ENDSLFN (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) 92 970724 1800 0.10 0.16 0.07 0.23 nd 0.27 0.08 92 970809 1200 nd 0.01 nd 0.03 nd nd 0.04 92 970822 1500 nd 0.01 0.02 0.03 nd nd nd 92 970911 1100 0.01 0.01 0.00 0.02 nd nd nd 92 971001 1400 nd nd 0.01 0.05 nd nd nd 92 971029 1230 nd nd nd 0.02 nd nd nd 92 971029 1415 nd 0.02 0.01 0.01 nd nd 0.02 92 971121 0 nd nd nd 0.02 nd nd nd 92 980108 1700 nd nd nd 0.04 0.01 nd nd 92 980303 1428 nd 0.09 nd 0.03 nd nd 0.08 92 980320 1500 nd 0.03 nd 0.04 nd nd 0.04 92 980327 1425 nd 0.02 nd 0.05 nd nd nd APPENDIX A-4: Data Listing for the Trent River STN# DATE TIME p,p-DDD o,p-DDT p,p-DDT MTHXYCHLR MIREX HCB OCS (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) 92 970724 1800 0.50 nd 0.49 nd 0.37 0.13 nd 92 970809 1200 nd nd 0.03 nd nd 0.02 nd 92 970822 1500 nd nd nd nd nd 0.02 nd 92 970911 1100 nd nd nd nd nd 0.00 nd 92 971001 1400 nd nd nd nd nd 0.01 nd 92 971029 1230 nd nd nd nd nd 0.01 nd 92 971029 1415 nd nd nd nd nd 0.01 nd 92 971121 0 nd nd nd nd nd 0.01 nd 92 980108 1700 nd nd 0.02 nd 0.00 0.02 nd 92 980303 1428 0.01 nd 0.01 nd nd 0.02 nd 92 980320 1500 nd nd 0.02 nd nd 0.02 nd 92 980327 1425 nd nd nd nd nd 0.02 nd APPENDIX A-5:

Data Listing for Station 93 Twenty Mile Creek APPENDIX A-5: Data Listing for Twenty Mile Creek STN# DATE TIME FLOW (CMS) SS(MG/L) TKN(MG/L) TP(MG/L) AL(UG/L) CD(UG/L) CR(UG/L) 93 970725 900 0.058 8.50 1.00 0.16 118.00 nd 5.58 93 970810 1300 0.002 1.00 1.00 0.15 71.60 0.2 5.31 93 970909 1430 0.050 2.50 0.72 0.06 38.60 nd 1.33 93 970929 1100 0.143 6.00 0.72 0.07 77.30 nd 2.15 93 971004 2300 0.152 7.00 1.60 0.16 82.00 nd 3.53 93 971009 1000 0.146 4.00 0.68 0.09 86.60 nd 3.69 93 971016 1100 0.078 2.50 0.66 0.08 34.50 nd 0.50 93 971027 0 0.5 (est.) 4.00 0.76 0.19 94.80 nd 0.50 93 971122 1430 3.270 77.50 2.00 0.39 852.00 0.8 9.97 93 980108 1116 59.000 299.00 3.40 0.98 2470.00 nd 2.43 93 980219 1645 35.100 279.00 2.50 0.76 2510.00 nd 8.08 93 980320 911 26.200 109.00 3.20 0.76 1310.00 nd 1.50 93 980327 850 83.900 349.00 2.20 0.91 1520.00 nd 1.37 STN# DATE TIME CU(UG/L) FE(UG/L) MN(UG/L) NI(UG/L) PB(UG/L) ZN(UG/L) TPCB(NG/L) 93 970725 900 1.40 159 153.00 nd nd 6.45 7.9 93 970810 1300 1.11 99.1 97.30 nd nd 3.02 1.5 93 970909 1430 1.44 51.2 22.30 3 nd 3.03 5.1 93 970929 1100 1.55 92.9 67.40 3 nd 7.73 3.0 93 971004 2300 1.49 94.4 52.60 4 nd 4.66 4.5 93 971009 1000 1.68 90.9 50.40 3 nd 4.28 2.5 93 971016 1100 1.33 61.8 25.00 nd nd 1.54 4.2 93 971027 0 1.57 120 19.00 nd nd 2.00 3.1 93 971122 1430 4.07 866 261.00 3 nd 17.70 2.7 93 980108 1116 6.21 1030 165.00 3 6 42.30 3.0 93 980219 1645 5.64 1800 88.40 5 7 28.40 1.7 93 980320 911 4.95 1180 45.20 20 nd 28.20 2.0 93 980327 850 5.25 1270 159.00 14 6 38.00 1.9 NOTE: unfiltered total mercury results were all below the detection limit of 0.02 µg/L and have not been included in this table wet weather flows are shown in bold APPENDIX A-5: Data Listing for Twenty Mile Creek STN# DATE TIME BAP (NG/L) TPAH(NG/L) a-BHC(NG/L) LINDANE HEPTACHLR ALDRIN HPTCHLR (NG/L) (NG/L) (NG/L) EPXDE(NG/L) 93 970725 900 nd 15.1 0.05 0.05 nd nd nd 93 970810 1300 0.23 9.7 0.07 0.09 nd nd nd 93 970909 1430 nd 31.1 0.02 0.04 nd nd nd 93 970929 1100 0.15 3.5 0.11 0.11 nd nd 0.01 93 971004 2300 nd 4.1 0.13 0.12 nd nd nd 93 971009 1000 0.09 12.0 0.09 0.08 nd nd nd 93 971016 1100 nd 17.6 0.03 0.10 nd nd nd 93 971027 0 nd 9.0 0.35 0.16 nd nd nd 93 971122 1430 nd 6.8 0.14 0.27 nd nd 0.01 93 980108 1116 nd 23.1 0.11 0.20 nd nd 0.03 93 980219 1645 0.67 28.2 0.39 0.45 nd nd 0.03 93 980320 911 0.91 32.3 0.30 0.68 nd nd 0.02 93 980327 850 2.05 53.4 0.35 0.66 nd nd 0.04 STN# DATE TIME g-CHLRDNE a-ENDSLFN a-CHLRDNE DIELDRIN p,p-DDE ENDRIN b-ENDSLFN (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) 93 970725 900 nd 0.20 0.02 0.06 nd nd 0.03 93 970810 1300 nd 0.02 nd 0.06 nd nd nd 93 970909 1430 nd 0.05 0.01 0.04 nd nd nd 93 970929 1100 nd 0.02 0.01 0.06 nd nd nd 93 971004 2300 nd 0.04 0.01 0.08 nd nd nd 93 971009 1000 nd nd 0.01 0.05 nd nd nd 93 971016 1100 nd nd nd 0.03 nd nd nd 93 971027 0 nd 0.03 0.01 0.03 nd nd nd 93 971122 1430 nd 0.02 0.01 0.04 nd nd nd 93 980108 1116 nd 0.05 nd 0.04 0.13 nd 0.08 93 980219 1645 nd 0.31 nd 0.09 nd nd 0.22 93 980320 911 nd 0.22 nd 0.08 nd nd 0.20 93 980327 850 nd 0.18 nd 0.13 nd nd 0.16 APPENDIX A-5: Data Listing for Twenty Mile Creek STN# DATE TIME p,p-DDD o,p-DDT p,p-DDT MTHXYCHLR MIREX HCB OCS (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) 93 970725 900 nd nd 0.05 nd nd 0.03 nd 93 970810 1300 nd nd 0.05 nd nd 0.02 nd 93 970909 1430 nd nd nd nd nd 0.02 nd 93 970929 1100 nd nd nd nd nd 0.01 nd 93 971004 2300 nd nd nd nd nd 0.02 nd 93 971009 1000 nd nd nd nd nd 0.02 nd 93 971016 1100 nd nd nd nd nd 0.01 nd 93 971027 0 0.01 nd nd nd 0.00 0.01 nd 93 971122 1430 0.01 nd 0.03 nd 0.00 0.01 nd 93 980108 1116 0.02 nd 0.31 nd 0.00 0.02 nd 93 980219 1645 nd nd 0.11 nd nd 0.03 nd 93 980320 911 nd nd 0.09 nd nd 0.03 nd 93 980327 850 0.01 nd 0.10 nd nd 0.03 nd APPENDIX A-6:

Data Listing for Station 94 Twelve Mile Creek APPENDIX A-6: Data Listing for Twelve Mile Creek STN# DATE TIME FLOW (CMS) SS(MG/L) TKN(MG/L) TP(MG/L) AL(UG/L) CD(UG/L) CR(UG/L) 94 970725 1100 189.4 25.50 0.30 0.04 157.00 nd 3.27 94 970810 1545 85.7 4.50 0.26 0.03 93.80 nd 3.68 94 970909 1230 218.0 6.00 0.26 0.02 83.70 nd 3.07 94 970929 1400 216.6 12.50 0.32 0.03 84.80 nd 2.28 94 971009 1230 213.0 9.50 0.24 0.02 92.90 nd 2.21 94 971016 1315 214.6 5.00 0.26 0.01 62.70 nd 0.50 94 971027 1610 213.0 9.50 0.26 0.02 106.00 nd 0.50 94 971122 1430 134.7 11.00 0.40 0.06 188.00 nd 8.22 94 980108 1015 226.3 207.00 0.84 0.22 634.00 nd 1.86 94 980219 1800 219.6 15.00 0.36 0.06 353.00 nd 1.05 94 980320 1003 218.0 5.00 0.32 0.02 103.00 nd 0.50 94 980327 945 209.5 200.00 0.30 0.08 245.00 nd 0.50 STN# DATE TIME CU(UG/L) FE(UG/L) MN(UG/L) NI(UG/L) PB(UG/L) ZN(UG/L) TPCB(NG/L) 94 970725 1100 1.53 229 17.50 nd nd 3.97 10.7 94 970810 1545 1.22 87.7 8.42 nd nd 1.63 7.9 94 970909 1230 1.46 96.3 8.67 nd nd 1.62 12.3 94 970929 1400 1.44 114 12.20 nd nd 1.70 3.7 94 971009 1230 1.20 85.3 8.08 nd nd 1.39 4.1 94 971016 1315 1.26 99.9 5.75 nd nd 0.60 4.9 94 971027 1610 1.62 175 10.50 nd nd 1.57 4.7 94 971122 1430 2.08 175 14.90 nd nd 5.37 6.5 94 980108 1015 3.97 597 111.00 2 nd 10.20 8.1 94 980219 1800 1.84 322 13.00 4 nd 3.38 6.5 94 980320 1003 1.53 112 5.09 21 nd 3.11 2.4 94 980327 945 1.89 259 17.50 21 nd 5.14 2.5 NOTE: unfiltered total mercury results were all below the detection limit of 0.02 µg/L and have not been included in this table wet weather flows are shown in bold APPENDIX A-6: Data Listing for Twelve Mile Creek STN# DATE TIME BAP (NG/L) TPAH(NG/L) a-BHC(NG/L) LINDANE HEPTACHLR ALDRIN HPTCHLR (NG/L) (NG/L) (NG/L) EPXDE(NG/L) 94 970725 1100 0.47 17.7 0.41 0.48 nd nd 0.16 94 970810 1545 0.25 9.3 0.24 0.28 nd nd nd 94 970909 1230 0.20 33.8 0.14 0.23 nd nd 0.01 94 970929 1400 0.12 8.1 0.25 0.28 nd nd 0.04 94 971009 1230 0.26 9.4 0.30 0.28 nd nd 0.04 94 971016 1315 0.09 17.0 0.29 0.25 nd nd 0.03 94 971027 1610 nd 1.6 0.31 0.23 nd nd 0.04 94 971122 1430 nd 15.9 0.35 0.28 nd nd 0.03 94 980108 1015 1.52 51.0 0.25 0.24 nd nd 0.07 94 980219 1800 0.18 4.0 0.34 0.25 nd nd 0.06 94 980320 1003 0.55 23.2 0.37 0.33 nd nd 0.03 94 980327 945 3.11 71.3 0.46 0.36 nd nd 0.06 STN# DATE TIME g-CHLRDNE a-ENDSLFN a-CHLRDNE DIELDRIN p,p-DDE ENDRIN b-ENDSLFN (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) 94 970725 1100 0.15 0.20 0.10 0.34 nd 0.26 0.08 94 970810 1545 nd nd nd 0.10 nd nd nd 94 970909 1230 nd 0.03 nd 0.08 nd nd nd 94 970929 1400 nd 0.05 0.01 0.11 nd nd nd 94 971009 1230 nd 0.03 0.02 0.11 nd nd nd 94 971016 1315 nd 0.03 0.03 0.11 nd nd nd 94 971027 1610 nd 0.02 nd 0.09 nd 0.01 0.06 94 971122 1430 nd 0.03 0.01 0.10 nd nd 0.02 94 980108 1015 0.05 0.08 0.05 0.18 0.17 nd 0.16 94 980219 1800 0.01 nd 0.01 0.12 0.11 nd nd 94 980320 1003 nd 0.04 nd 0.13 nd nd 0.06 94 980327 945 nd 0.16 0.07 0.16 nd nd 0.13 APPENDIX A-6: Data Listing for Twelve Mile Creek STN# DATE TIME p,p-DDD o,p-DDT p,p-DDT MTHXYCHLR MIREX HCB OCS (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) (NG/L) 94 970725 1100 0.60 nd 0.61 nd 0.39 0.19 nd 94 970810 1545 nd nd 0.05 nd nd 0.02 nd 94 970909 1230 nd nd nd nd nd 0.01 nd 94 970929 1400 nd nd nd nd nd 0.01 nd 94 971009 1230 nd nd nd nd nd 0.01 nd 94 971016 1315 nd nd nd nd nd 0.02 nd 94 971027 1610 nd nd nd nd nd 0.01 nd 94 971122 1430 0.02 nd 0.01 nd 0.00 0.01 nd 94 980108 1015 0.13 nd 0.41 0.02 0.00 0.03 nd 94 980219 1800 0.06 nd 0.22 nd nd 0.02 nd 94 980320 1003 nd nd 0.03 nd nd 0.02 nd 94 980327 945 0.11 nd 0.22 0.05 nd 0.03 nd

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