Sediment Evaluation Report. Upper Saginaw River Saginaw, Michigan. The Dow Chemical Company. Prepared for. Midland, MI

Transcription

1 ediment Evaluation Report Upper aginaw River aginaw, Michigan Prepared for The Dow Chemical Company Midland, MI May 2005

2 Contents ection Page Contents... iii Acronyms and Abbreviations...iv 1 Introduction ummary of Field Activities ediment Thickness Characterization ediment Characterization ample Collection Laboratory Analysis Validation ummary of Data ediment Thickness Characterization ediment Characterization Conclusions References Tables 1 ummary of aginaw River Probing tudy 2 Probing ummary 3 Grain size in ediment 4 TEQs in ediment 5 PAHs in ediment 6 Metals and Mercury in ediment 7 Total Organic Carbon in ediment Figures 1 Upper aginaw River Project Area 2 Poling Transects Upper aginaw River 3 Upper aginaw River ediment ample Locations Appendixes A B C D E ediment Evaluation and ample ummary Data Validation ummary Report ediment ample Results Probing and ediment Data Cross-sections & Browser Utility File (CD) Grain ize ieve Analysis Results III

3 Acronyms and Abbreviations CD CH2M HILL COE Dow EPA HP LTI MOCA M/MD PAH PCB PPE ppt QA/QC QAPP AP OP TEQ TOC compact disc CH2M HILL, Inc. U.. Army Corps of Engineers The Dow Chemical Company U.. Environmental Protection Agency when used with method (e.g., EPA Method 8260) Health and afety Plan LimnoTech, Inc. Midland Offsite Corrective Action matrix spike/matrix spike duplicate polycyclic aromatic hydrocarbon polychlorinated biphenyl Personal Protective Equipment part per trillion quality assurance/quality control Quality Assurance Project Plan ampling and Analysis Plan tandard Operating Procedure total toxic equivalent total organic carbon IV

4 1 Introduction This document presents the results of sediment characterization sampling events conducted for The Dow Chemical Company (Dow) in December 2004, in accordance with the Upper aginaw River ediment Investigation ampling and Analysis Plan (AP) (CH2M HILL, 2004a). The objectives of the study were to determine the thickness and nature of unconsolidated sediments and determine the concentrations of potential contaminants of interest (PCOIs) in sediments in the Upper aginaw River. All of the proposed sampling locations were not sampled due to inclement weather conditions. This report documents the field activities and reports the data collected during the sampling event. The contents of this report include a discussion of: Field activities conducted and data collected during the sampling event (ection 2) Laboratory analysis of sediment samples (ection 3) ummary of the analytical validation (ection 4) A discussion of the analytical results (ection 5) Detailed tabular information on the sample stations and cores collected (Appendix A) Detailed information on the analytical validation (Appendix B) All chemical analytical results (Appendix C) Probing and ediment Data Cross-sections (Appendix D) Grain ize ieve Analysis Results (Appendix E) 1-1

5 2 ummary of Field Activities In December 2004, a preliminary investigation and subsequent data evaluation was conducted on the sediments of the Upper aginaw River between the ixth treet Turning Basin in aginaw and the confluence with the hiawassee and Tittabawassee Rivers (ediment tudy Area, Figure 1). The objectives of this study, as indicated in the AP, were to: 1. Develop an understanding of the thickness of sediments in the stretch of river in the ediment tudy Area 2. Collect representative sediment samples within the ediment tudy Area for analysis of dioxins and furans, PCBs, PAHs, and metals 3. Evaluate dioxin and furan concentrations in sediments at locations where elevated dioxin and furan concentrations were detected in samples collected by the COE in July 2004 This section presents a summary of the field activities conducted to meet the objectives of the study described above. 2.1 ediment Thickness Characterization ampling Design A probing study was conducted to measure the approximate thickness of soft/unconsolidated sediment in the Upper aginaw River ediment tudy Area. The sediment probing study was conducted along 5 miles of the aginaw River downstream of the confluence with the Tittabawassee River. The study was conducted from December 13 through 16. The study included manually probing the soft sediment along 19 transects located at 0.25-mile intervals (Figure 2). The study was conducted in accordance with the AP, the Quality Assurance Project Plan (QAPP) (CH2M HILL, 2004b), and the Dow MOCA Health, afety, and Environment Plan (HP) (CH2M HILL, 2003). ummary of Field Activities Before the probing study, all transects were marked or cleared by the utility companies through MI DIG. A group meeting was also conducted with all of the utility representatives and LTI. The area between Court treet and Holland Avenue was not probed because the aginaw Water and ewer Department was unable to identify the location of all its lines in this area. As described in the AP, probing of surficial unconsolidated deposits was conducted at a minimum of five and a maximum of twelve locations along each transect. The actual number of locations was determined in the field based on the width of the river, observed 2-1

6 UMMARY OF FIELD ACTIVITIE variability in water depths, and observed variability in measured sediment thickness along adjacent transects. ediment and water depths were recorded at each location. It should be noted that this method of determining sediment depth is somewhat qualitative and is intended to provide a preliminary characterization of the thickness of unconsolidated material. In addition to sediment depth, the characteristics of the sediment bed were determined by the field operator using qualitative assessments of the feel of the probed sediment. This method can be very effective at locating the transition from relatively loose, unconsolidated sediments to compacted sands, gravelly materials, or hard clays at depth. A map of all sediment probing locations is shown in Figure 2. A 5/8-inch-diameter steel rod with graduated length markings made up of 4-foot-long sections was used to manually probe and record the thickness of unconsolidated materials up to approximately 28 feet below the water surface. Data recorded for each probing location of each transect included the following: The location coordinates of each monitoring point (recorded using a Trimble global positioning system with sub-meter accuracy The monitoring point number The time of probing at each monitoring point The final sediment probe depth at refusal, relative to water surface at each monitoring point Field observations about sediment characteristics from the feel of probing, such as depths of changes in probe resistance, granularity and the presence of cohesive fines (clays/silts) on the probe end after withdrawal The water depth at each monitoring point the water surface was used as the reference point at each monitoring point to measure final probe depth and determine sediment thickness. 2.2 ediment Characterization ample Collection ampling Design ediment cores were collected using a vibracore from predetermined probing transects in the ediment tudy Area, approximately 1 mile apart. In most cases, three sample locations were sampled along each transect: one location was sampled from the center of the river and samples were collected midway between the center of the river and each banks. One transect location was eliminated due to the presence of numerous underground utilities and one transect location was not able to be completed due to inclement weather conditions. ediment core locations are shown in Figure 3. As part of the sampling, co-located sediment cores were also collected at one location to evaluate sediment variability within a spatial area. The co-located sample core was collected at a random location approximately 10 to 20 feet from the original sample location. 2-2

7 UMMARY OF FIELD ACTIVITIE ummary of Field Activities A preliminary sediment characterization study was conducted from December 13 through 16, 2004 in accordance with the AP, QAPP, and HP. Twenty-nine sediment cores were obtained from 15 locations along 6 transects during the December 2004 sediment characterization study. Cores were collected to a maximum depth of approximately 10 feet below the sediment/surface interface or until refusal (the vibracore could no longer penetrate the substrate). Two sediment cores were collected at each location; one core was used to evaluate the sediment lithology, including grain size analysis, and the other was used for chemical analysis (dioxins and furans, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), total metals, mercury, and total organic carbon). Inclement weather prevented the collection of samples from all of the locations proposed in the AP. Modifications to the AP due to weather were as follows: amples were collected from poling transects spaced 1 mile apart, instead of transects spaced 0.5 mile apart amples from all transects spaced 1 mile apart were not collected amples were not collected from the historic COE locations where elevated dioxin and furan concentrations were reported Each sample location was assigned a unique identifier according to the ample Identification Technical Memorandum (CH2M HILL, 2004c). Two sediment cores (one for lithological analysis and one for chemical analysis) were collected at each location, except for location AR where only one sediment core was collected due to adverse weather conditions. This core was processed for lithological analyses only. Two sediment cores were collected at AR as co-locates to AR The co-located sediment core was collected at a random location approximately 20 feet northeast from the original sample location. The location coordinates, water depth, sediment penetrated and sediment recovered measurements were recorded for each sediment core collected. A summary of these results is presented in Appendix A, Table A-1. At the end of each day, the sediment cores were transferred to the Midland office/ processing facility. The sediments collected for chemical analyses were frozen in a vertical position. Those cores collected for lithological analyses were also stored vertically, but not frozen. The sediment cores were processed for lithological and chemical analyses in January The lithologic core was examined by a geologist, who prepared a lithologic log per Field tandard Operating Procedure 2 in the Field tandard Operating Procedures (Field OPs) (CH2M HILL, 2004d). The geologist collected samples for grain size at intervals that represented the different lithologic features in each core. These samples were sent to Gulf Coast Analytical Laboratory for grain size analysis. 2-3

8 UMMARY OF FIELD ACTIVITIE The cores for chemical analyses were thawed in the vertical position and processed. The 0- to 0.3-foot interval (surface interval) and 3.5- to 4-foot interval (sub-surface interval) of each core was sectioned using a hacksaw, homogenized, placed in the appropriate sample containers, and shipped for analysis (refer to ection 3). If there was less than 4 feet of recovery in a core, the bottom 6 inches of the core was sampled. In two locations, AR and AR-03171, approximately 5 inches of sediment were obtained due to the presence of stiff clay in the lower interval. Fifty-nine sediment samples were processed and sent to the laboratory for analysis, which included 31 samples for grain size analyses and 28 samples for chemical analyses. The tation IDs, location coordinates, ample IDs, sample depth intervals, and associated analytical batches are summarized in Table A-2. Quality control samples were collected in accordance with the QAPP. As part of the chemical analysis sampling, three field duplicates, two matrix spike/matrix spike duplicates (M/MDs), and one equipment blank were collected. Four field duplicates were collected as part of the grain size analysis. Table A-3 of Appendix A summarizes the QC sample type, event frequency, and QAPP-specified frequency for QC sample collection. The remaining portions of the sediment cores were placed in frozen storage. Investigation Derived Waste Dedicated LEXAN core tubes were used for the collection of the sediment samples. The excess sediment from the lithology cores was disposed of in drums. Decontamination water was disposed of in a separate drum. The drums are being stored in the warehouse and will be sent for disposal pending analysis. Personal Protective Equipment (PPE) was containerized in trash bags and discarded in the office dumpster. 2-4

9 3 Laboratory Analysis The samples collected from the sediment cores were labeled, packaged, and shipped to the appropriate laboratory in accordance with the ample Handling and hipping Custody Procedures Field OP (CH2M HILL, 2004d). Analysis of samples collected during the sampling event was conducted in accordance with the QAPP. All dioxin and furan analyses were preformed at Alta Analytical Laboratory in El Dorado Hills, California. Dioxin and furans were analyzed for 17 congeners using EPA Method Analyses for co-planner PCBs, PAHs, total metals, mercury, total organic carbon (TOC), and grain size were performed at Gulf Coast Analytical Labs in Baton Rouge, Louisiana. PCBs were analyzed for PCB-1016, PCB-1221, PCB-1232, PCB-1242, PCB-1248, PCB-1254, PCB-1260, PCB-1262, and PCB-1268 using EPA Method PAHs and metals, as stated in the AP (CH2M HILL, 2004a), were analyzed for using EPA Methods 8270 and 6010B, respectively. Mercury was analyzed for using EPA Method 7471A. 3-1

10 4 Validation Analytical data from the sediment sampling event was validated to Level III by CH2M HILL chemists. The overall evaluation of the data indicates the sample handling, shipment, and analytical procedures were adequately completed. The validation review demonstrated that the analytical systems were generally in control and the data results can be used for their intended purposes. The complete validation summary report is provided in Appendix B. 4-1

11 5 ummary of Data This section provides a brief summary of the data collected during the study. 5.1 ediment Thickness Characterization ediment thickness was probed at 139 locations across 19 transects in December Table 1 presents a summary of the results of the probing study. Although effective, the poling method used to obtain sediment characteristics is limited due to it s reliance on field operator judgment. The field operator may experience complications such as woody debris, buried stones, or perched lenses of clay or gravel that may affect results. The measured thickness of unconsolidated deposits observed was typically between 5 and 8 feet with a maximum of feet at one location. Water depths at the probing locations shown on Figure 2 averaged 11.3 feet with a maximum of 22 feet at one location. As summarized in Table 1, refusal was encountered at all but approximately 5% of the probing monitoring points (7 locations). This was due to the depth and force of the water at these locations, which caused the steel rod to bow. Clay or silt was observed on the end of the probe at approximately 33% of the monitoring points, indicating that the underlying glacial till was encountered and the unconsolidated deposit had been completely penetrated. Table 2 presents a summary of the field data collected at the transects, including transect locations, depths of water, probe depths, and thickness of the sediments. The poling data by individual transect are presented as cross-sections in Appendix D. ince poling was not performed at the waters edge at each bank, unconsolidated deposit thickness was assumed to be equal to the thickness determined at the poling location nearest the bank within the corresponding transect. This assumption appears to be reasonable based on experience with poling the Tittabawassee River located upstream of the aginaw River. The data can also be viewed using a browser utility that facilitates the visual review of sediment and water thickness data and includes photographs taken at each transect showing views of both banks and views looking upstream and downstream from the center of the transects. The browser utility file is included on a CD in Appendix D. Thickness of unconsolidated deposits were variable at poling locations within transects with an apparent general trend of increasing thickness from the southern/eastern river bank toward mid-river and the northern/western river bank. Thickness of unconsolidated deposits at transects were also variable along the study area. The cross-sections in Appendix D also present sediment core locations, thickness, and grain size analytical results for cores collected for lithological analyses. Unconsolidated deposit thickness observed during core collection (Table A-1 of Appendix A) were generally less than the thickness determined during the poling study (Table 2). In order to compare deposit thickness estimated using the two methods, thickness data from the poling study 5-1

12 UMMARY OF ANALYTICAL DATA was interpolated between locations since cores were not collected at the exact poling locations. 5.2 ediment Characterization ediment Type and Grain ize ediment core samples were analyzed for grain size to determine the types of sediments present in the Upper aginaw River ediment tudy Area. A total of 31 grain size samples were collected at 15 locations. amples were collected near the river-sediment interface (surface interval) and, where sediment core length allowed, at least one other interval from 2 to 6 feet below the river surface (sub-surface interval). Results of the grain size analysis are included in Appendix E and summarized and presented in Table 3. The Unified oil Classification ystem (ATM D ) was used to classify the lithology of the sediment samples, and the majority of the samples are either sand (61 percent) or silty sand/sand with silt (10 percent). The remaining sediment samples were fine-grained sandy silts (26 percent) or clays (3 percent). More than 80 percent of the locations had sand at the sediment-river interface. Approximately 50 percent of the locations had sand or sand and gravel throughout the entire vertical interval, and the rest were somewhat more fine (e.g., silty sand) or fine (silt or clay) at depth. A total of four duplicate samples were taken for grain size analysis. Each of these yielded either the same sediment type (three of four samples) or a close sediment type (silt with sand vs. sandy silt). The results of grain size analysis for the sediments by individual transect are presented in cross-sections in Appendix D. Analytical Results Twenty-eight sediment core samples were collected at 14 locations and analyzed for dioxins and furans, PCBs, PAHs, metals, and TOC. amples collected during this study were analyzed for all 17 of the 2, 3, 7, 8-substituted dioxin and furan congeners. TEQs were calculated according to Dow program guidance (CH2M HILL, 2004e). TEQ values for each location and sample interval are shown in Table 4. A table showing analytical results for all 17 congeners is presented in Appendix C, Table C-1. Figure 3 provides an overview of the locations sampled, as well as the TEQ values found at each location. TEQ results are also presented on the cross-sections in Appendix D. ediment dioxin and furan concentrations from this sampling event ranged from 6.2 to 13,000 ppt TEQ in the top 0.3 foot of sediments (surface interval). The mean and median for the surface interval sample data set is 1,000 ppt and 34 ppt TEQ, respectively. Dioxin and furan concentrations ranged from 0.35 to 7,300 ppt TEQ in the subsurface interval of sediments collected. The mean and median for the sub-surface interval sample data set is 640 ppt and 4.6 ppt TEQ, respectively. The following presents the distribution of results with respect to TEQ concentration: 5-2

13 UMMARY OF ANALYTICAL DATA # amples in Dataset # amples < 100 ppt # amples < 1,000 ppt # amples > 1,000 ppt urface Interval (79%) 13 (93%) 1 (7%) ub-surface Interval (71%) 13 (93%) 1 (7%) Total (75%) 26 (93%) 2 (7%) PAHs were detected in all but two of the sample location intervals. AR from 0 to 0.3 foot and AR from 3 to 3.5 feet did not contain detectable concentrations of PAHs. The maximum concentration of PAHs was 2,840 ug/kg for fluoranthene at AR in the surface interval (top 0.3 foot). Table 5 presents the detected concentrations of PAHs in sediments. Metals were detected in all samples. The maximum concentration of metals was 115,000 ug/kg for barium at AR-0317 in the sub-surface interval. Table 6 presents the detected concentrations of metals in sediments. amples were also analyzed for TOC. TOC levels in sediments ranged from non-detect in sediments to 22,975 mg/kg. Table 7 presents the locations and concentrations where detectable levels of TOC were found. PCBs were not detected in any of the samples collected. Tables showing all of the analytical results for PAHs, metals, TOC, and PCBs, including the nondetect results, are presented in Appendix C, Tables C-2 through C-4. Laboratory nondetect results are presented along with the method detection limit (MDL). 5-3

14 6 Conclusions ediment thickness of unconsolidated deposits observed during the December 2004 probing activities was typically between 5 and 8 feet; however, thickness was observed up to feet. Thickness of unconsolidated deposits observed in collected cores were generally less than the thickness estimated during the poling study. Concentrations of contaminants, including dioxin/furan TEQ concentrations, in the Upper aginaw River sediment appear to be highly variable. ediments containing TEQ values greater that 1,000 ppt were found in two sample locations, AR (0-0.3 ft) and AR (3.5-4 ft). PCBs were not detected in samples collected in December Analytical results from samples collected from the co-locate core (AR-03225) were compared to results from samples collected from the original core (AR-03180). Concentrations were similar at each location with concentrations of some PAHs and metals higher in AR than in AR

15 7 References CH2M HILL Dow MOCA Health, afety, and Environment Plan. December. CH2M HILL. 2004a. Upper aginaw River ediment Investigation ampling and Analysis Plan. December. CH2M HILL. 2004b. Quality Assurance Project Plan. April. CH2M HILL. 2004c. ample Identification Technical Memorandum. March. CH2M HILL. 2004d. Field tandard Operating Procedures. April. CH2M HILL. 2004e. Approaches for Evaluation of Dioxin/Furan Analytical Data for Use in Calculating Toxicity Equivalent to 2,3,7,8-TCDD (TEQ) OP. March Lakeshore Engineering ervices, Inc Upper aginaw River, Michigan ediment ampling and Analysis Report for July 19-29, January. Prepared for Department of the Army, Detroit District, Corps of Engineers. Van den Berg, M.; et al Toxic equivalency factors (TEFs) for PCBs, PCDDs, PCDFs for humans and wildlife. Environmental Health Perspectives. 106:

16 Tables

17 Table 1 ummary of aginaw River Probing tudy, December 2004 Dow MOCA Upper aginaw River ediment Evaluation Extent of River urveyed 5 river miles Transects surveyed 19 Monitoring points probed for sediment thickness 139 (7 where refusal not encountered, 46 with clay/silt observed on probe end) Photographs of transect views 97 Measured thickness of unconsolidated deposits summary for probing locations* Water depth summary for probing locations Average: 6.8 feet Minimum: 0 feet Maximum: feet Average: 11.3 feet Minimum: 1.5 feet (shorelines) Maximum: 22 feet * The recorded sediment thickness at the locations where refusal was not reached were used In the summary statistics.

18 TABLE 2 Transect Probing tudy ummary, December 2004 Dow MOCA Upper aginaw River ediment Evaluation Distance from outh/east Water ediment Probe Depth Clay/ilt on Location ID Bank (ft) Depth (ft) Thickness (ft) Probe ID (ft) Tip of Probe Date AG /16/2004 AG yes 12/16/2004 AG yes 12/16/2004 AG yes 12/16/2004 AG yes 12/16/2004 AG /16/2004 AG yes 12/16/2004 AG yes 12/16/2004 AG /16/2004 AG /16/2004 AG yes 12/16/2004 AG yes 12/16/2004 AG yes 12/16/2004 AG yes 12/16/2004 AG /16/2004 AG /16/2004 AG yes 12/16/2004 AG /16/2004 AG /16/2004 AG /16/2004 AG /16/2004 AG /16/2004 AG /13/2004 AG /13/2004 AG yes 12/13/2004 AG /13/2004 AG /13/2004 AG /13/2004 AG /13/2004 AG yes 12/13/2004 AG yes 12/13/2004 AG /13/2004 AG /13/2004 AG /13/2004 AG /13/2004 AG yes 12/15/2004 AG yes 12/15/2004 AG /15/2004 AG yes 12/15/2004 AG /15/2004 AG yes 12/15/2004 AG /15/2004 AG yes 12/15/2004 AG /15/2004

19 TABLE 2 Transect Probing tudy ummary, December 2004 Dow MOCA Upper aginaw River ediment Evaluation Distance from outh/east Water ediment Probe Depth Clay/ilt on Location ID Bank (ft) Depth (ft) Thickness (ft) Probe ID (ft) Tip of Probe Date AG /15/2004 AG /15/2004 AG yes 12/15/2004 AG /13/2004 AG /13/2004 AG yes 12/13/2004 AG /13/2004 AG /13/2004 AG /13/2004 AG /14/2004 AG /14/2004 AG /14/2004 AG /14/2004 AG /14/2004 AG /14/2004 AG yes 12/14/2004 AG yes 12/15/2004 AG /15/2004 AG /15/2004 AG /15/2004 AG /15/2004 AG /15/2004 AG /15/2004 AG yes 12/14/2004 AG /14/2004 AG /14/2004 AG /14/2004 AG /14/2004 AG /14/2004 AG /14/2004 AG /14/2004 AG /15/2004 AG /15/2004 AG /15/2004 AG /15/2004 AG yes 12/15/2004 AG /15/2004 AG yes 12/15/2004 AG yes 12/15/2004 AG /14/2004 AG /14/2004 AG yes 12/14/2004 AG /14/2004 AG /14/2004

20 TABLE 2 Transect Probing tudy ummary, December 2004 Dow MOCA Upper aginaw River ediment Evaluation Distance from outh/east Water ediment Probe Depth Clay/ilt on Location ID Bank (ft) Depth (ft) Thickness (ft) Probe ID (ft) Tip of Probe Date AG /14/2004 AG /14/2004 AG /14/2004 AG yes 12/16/2004 AG /16/2004 AG /16/2004 AG yes 12/16/2004 AG yes 12/16/2004 AG /14/2004 AG /14/2004 AG /14/2004 AG yes 12/14/2004 AG yes 12/14/2004 AG /14/2004 AG yes 12/14/2004 AG /14/2004 AG /15/2004 AG yes 12/15/2004 AG /15/2004 AG /15/2004 AG yes 12/15/2004 AG /15/2004 AG yes 12/15/2004 AG /15/2004 AG /14/2004 AG yes 12/14/2004 AG yes 12/14/2004 AG /14/2004 AG /14/2004 AG /14/2004 AG /14/2004 AG yes 12/14/2004 AG yes 12/14/2004 AG /14/2004 AG /15/2004 AG /15/2004 AG /15/2004 AG yes 12/15/2004 AG /15/2004 AG yes 12/15/2004 AG /16/2004 AG /16/2004 AG yes 12/16/2004 AG /16/2004

21 TABLE 2 Transect Probing tudy ummary, December 2004 Dow MOCA Upper aginaw River ediment Evaluation Distance from outh/east Water ediment Probe Depth Clay/ilt on Location ID Bank (ft) Depth (ft) Thickness (ft) Probe ID (ft) Tip of Probe Date AG yes 12/16/2004 AG /16/2004 AG /16/2004 AG /16/2004 AG /16/2004 AG /16/2004 AG yes 12/16/2004 Probe depth (ft) Notes: = probe at maximum possible length but did not meet refusal = green highlighted cell value probably overestimated because of probe bowing in river current

22 TABLE 3 Grain ize in ediment, December 2004 ediment ampling Event Dow MOCA Upper aginaw River ediment Evaluation Particle ize Results (percent) Location ID Field ample ID Depth (ft) <0.005 (mm) -- clay (mm) -- silt (mm) -- sand 5-50 (mm) -- gravel Particle ize Classification* AR ED silt w/sand AR ED sand AR ED sandy silt AR ED sand AR ED sandy silt AR ED sandy silt AR ED sand w/gravel AR ED clay w/sand AR ED sand AR ED sand w/gravel AR ED sand AR ED silt w/sand AR ED silty sand AR ED sand AR ED sand AR ED sand AR ED silty sand AR ED silty sand AR ED sand AR ED sand AR ED sand AR ED silt AR ED sand AR ED sand AR ED sand AR ED silt w/sand AR ED sand AR ED sand AR ED sand w/gravel AR ED sand AR ED silt *The Unified oil Classification ystem (ATM D ) was used to classify the lithology of grain size results. ince the grain size analysis only records the particle size and not the sorting (e.g. - poorly sorted or well sorted), the sorting portion of the UC sediment classification has been omitted.

23 TABLE 4 TEQs in ediment, December 2004 ediment ampling Event Dow MOCA Upper aginaw River ediment Evaluation Location ID Field ample ID Depth (ft) TEQ Result (ng/kg) AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED

24 TABLE 5 PAHs in ediment, December 2004 ediment ampling Event Dow MOCA Upper aginaw River ediment Evaluation 2-Methylnaphthalene Acenaphthene Acenaphthylene Anthracene Location ID Field ample ID Depth (ft) Units AR ED ug/kg 77.2 J 76.4 J 87.3 J 57.8 J 61.5 J 102 J 177 J 62.3 J 125 J AR ED ug/kg 44.4 J 191 J 122 J 137 J 54.7 J 37.8 J 160 J 306 J 130 J 237 J AR ED ug/kg 15.9 J 8.98 J 24.8 J 24.9 J 29 J 16.3 J 28.7 J AR ED ug/kg 18.2 J AR ED ug/kg 29 J 13.6 J AR ED ug/kg 11.3 J 14.4 J 14.9 J 21.6 J 30.3 J 13 J 28.3 J AR ED ug/kg 53.3 J AR ED ug/kg 44.3 J 8.39 J AR ED ug/kg 669 J AR ED ug/kg 19.9 J 139 J 158 J J 702 J J 324 J J J 247 J 42.3 J AR ED ug/kg 12.2 J 13.2 J 18.4 J 8.69 J 18.6 J 50.4 J 40.5 J 43.4 J AR ED ug/kg 77.2 J AR ED ug/kg 63.1 J 13.8 J 14.4 J AR ED ug/kg 114 J AR ED ug/kg 31.3 J 39.7 J 41.7 J 47.2 J 43.3 J 34.4 J 32 J 52.4 J 32.2 J 79 J 36 J 34.9 J 83.4 J 88.6 J AR ED ug/kg 22 J 30.2 J 49.8 J 136 J 91.8 J 91.6 J 92.8 J 60.6 J 129 J 323 J 41.9 J 58.9 J 39.4 J 348 J 299 J AR ED ug/kg 20.5 J 15.5 J 12.5 J 10.4 J 17.4 J 22.4 J 11.6 J 23.4 J 27.8 J AR ED ug/kg 66.4 J AR ED ug/kg 7.67 J 9.1 J 14.4 J 10.3 J 22.9 J AR ED ug/kg 12.3 J 17.1 J 13.1 J 11.2 J 26.7 J 44.3 J 53 J 47.3 J AR ED ug/kg 32 J AR ED ug/kg 19.3 J 19.4 J 17.5 J AR ED ug/kg 18.7 J 32.9 J 28.9 J 46.1 J 25.4 J 38.2 J AR ED ug/kg 53.1 J AR ED ug/kg 78.8 J Notes: Only detected values are reported J - indicates an estimated value Benzo(a)anthracene Benzo(a)pyrene Benzo(b)fluoranthene Benzo(g,h,i)perylene Benzo(k)fluoranthene Chrysene Dibenz(a,h)anthracene Fluoranthene Fluorene INDENO(1,2,3-C,D)PYRENE Naphthalene Phenanthrene Pyrene

25 TABLE 6 Metals and Mercury in ediment, December 2004 ediment ampling Event Dow MOCA Upper aginaw River ediment Evaluation Arsenic Barium Beryllium Location ID Field ample ID Depth (ft) Units AR ED ug/kg 8040 J J J J J J AR ED ug/kg 9240 J J 3680 J J J J AR ED ug/kg 5220 J J 8050 J J J J AR ED ug/kg 5780 J J J J J AR ED ug/kg J J J J J AR ED ug/kg J J J J J J J AR ED ug/kg J 4270 J J 2970 J 1080 J 2080 J J AR ED ug/kg J 5160 J J 2320 J 3670 J 4010 J J AR ED ug/kg J 4380 J J 1600 J 1480 J 2680 J J AR ED ug/kg J 576 J J J 9400 J J J AR ED ug/kg J 103 J 5510 J J 3250 J 1840 J 3730 J J AR ED ug/kg J 5050 J J 9500 J 1030 J 2050 J J AR ED ug/kg J 4120 J J 963 J 1910 J J AR ED ug/kg J 236 J J J 5840 J J J AR ED ug/kg J 114 J 5230 J J 2670 J J J AR ED ug/kg 7430 J J J J J AR ED ug/kg J 7930 J J 4520 J 946 J J J AR ED ug/kg J 288 J J J J J J AR ED ug/kg J 6580 J J 1580 J 3800 J J AR ED ug/kg J 216 J J J 5870 J J J AR ED ug/kg J 6560 J J 1640 J 2980 J J AR ED ug/kg J 3860 J J 749 J 2390 J J AR ED ug/kg 2970 J J 4470 J J J J AR ED ug/kg J 147 J J 7990 J J AR ED ug/kg 6020 J J J 2120 J J AR ED ug/kg 9980 J J J J J AR ED ug/kg 6680 J J J J 8640 J AR ED ug/kg 7080 J J J J J J Notes: Chromium, Total Cobalt Copper Lead Lithium Mercury Nickel Thallium Vanadium Zinc

26 TABLE 7 Total Organic Carbon in ediment, December 2004 ediment ampling Event Dow MOCA Upper aginaw River ediment Evaluation Location ID Field ample ID Depth (ft) TOC Result (mg/kg) AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED

27 Figures

28 N. Center Rd. Project Area CarrolltonTurning Basin ixth treetturning Basin E. Genesee Ave. 46 Williamson Rd. Confluence Area 13. Washington Rd. LEGEND Turning Base Area City Limits ample Event Area 0 2,400 4,800 Feet FIGURE 1 Project Area ediment Evaluation Report Upper aginaw River Dow Midland Offsite Corrective Actions Program File Path: U:\GI\MapDocs\0327a.mxd, Date: 04 28, :23:22 PM, User: JHANEN1

29 . Center Rd. N. Center Rd. Zilwaukee CarrolltonTurning Basin aginaw River ixth treetturning Basin Transect 19 AG to AG Transect 18 AG to AG Transect 17 AG to AG Transect 15 AG to AG Transect 16 AG to AG Transect 13 AG to AG Transect 14 AG to AG Brockway Rd. Transect 11 AG to AG aginaw E. Genesee Ave. Transect 12 AG to AG Transect 10 AG to AG W. Michigan Ave. Transect 9 AG to AG Transect 8 AG to AG Transect 7 AG to AG Michigan Ave. Transect 6 AG to AG Transect 4 AG to AG aginaw River Williamson Rd. Transect 5 AG to AG Tittabawassee River Transect 2A AG to AG Transect 3 AG to AG Transect 1A AG to AG hiawasse e River Transect 1B AG to AG Confluence Area Transect 2B AG to AG Washington Rd. LEGEND hiawassee River Cass River Polling Location Turning Base Area City Limits 0 2,400 4,800 Feet FIGURE 2 Final Polling Locations ediment Evaluation Report Upper aginaw River Dow Midland Offsite Corrective Actions Program File Path: U:\GI\MapDocs\0328a.mxd, Date: 04 28, :25:22 PM, User: JHANEN1

30 . Center Rd. N. Center Rd. Zilwaukee 84 AR ' ' 0.43 AR ' ' 2 aginaw River AR ' ' AR ' 12 AR ' ' 0.35 Brockway Rd. AR ' ' ' 6.7 aginaw E. Genesee Ave. AR ' ' AR ' ' 39 W. Michigan Ave.. Michigan Ave. AR ' ' 0.48 aginaw River AR AR ' ' 82 Williamson Rd. AR ' ' 590 AR Tittabawassee River 0-0.3' ' 7300 AR ' ' 1 AR hiawasse e River Confluence Area ' ' 2.4. Washington Rd. LEGEND ediment Core ample tation ample Depth (feet) TEQ Result (ppt) hiawassee River City Limits Cass River Turning Base Area Notes: 1. Co-Located ample 2. ampled for Lithology 0 2,400 4,800 Feet FIGURE 3 TEQ Results at ediment Transects ediment Evaluation Report Upper aginaw River Dow Midland Offsite Corrective Actions Program File Path: U:\GI\MapDocs\0329a.mxd, Date: 04 27, :19:06 PM, User: JHANEN1

31 Appendix A ediment Location and ample ummary

32 TABLE A-1 ummary of Field Measurements, December 2004 ediment ampling Dow MOCA Upper aginaw River ediment ampling Location ID Water Depth (ft) Penetrated Depth (ft) ediment Recovered (ft) AR > AR ~ AR AR AR AR AR AR AR AR AR AR AR AR AR AR AR-03225* AR-03225* AR AR AR AR AR AR AR AR NA AR AR AR *AR is the co-located location to AR A-1

33 TABLE A-2 ample tation ummary Dow MOCA Upper aginaw River ediment ampling Location ID Northing Easting ample ID ample Depth Interval (ft) Analytical Batch* AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED A-2

34 TABLE A-2 ample tation ummary Dow MOCA Upper aginaw River ediment ampling Location ID Northing Easting ample ID ample Depth Interval (ft) Analytical Batch* AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED AR ED *Analytical batches are from Alta Analytical Laboratory (five digit batch numbers) and Gulf Coast Analytical Labs (nine digit batch numbers). A-3