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"description": "This technical memorandum presents a summary of the sampling for polychlorinated biphenyls (PCBs)conducted in 2020 in Lower Beaverdam Creek (LBC), in Prince George\u2019s County, Maryland by theMaryland Department of the Environment (MDE) Land Restoration Program (LRP). Field activities for thisinvestigation included sediment, surface water, and fish sampling. The objective of this sampling is tofurther refine the conceptual site model for the PCB contamination that was found previously in LBCsediment and surface water in November 2019, and to aid in the ongoing source track-down effort inthe LBC watershed.MDE conducted surface water and sediment sampling for PCBs along the entire length of LBC inNovember 2019 (MDE, 2021). Both surface water and sediment data indicated two primary areas ofconcern for PCBs in LBC: the stretch of LBC parallel to Pennsy Drive (just north of the LandoverRoad/Route 202 bridge), and the area adjacent to the I-295-US-50 Interchange. To further delineatethese two areas of concern, additional sediment and surface water sampling was conducted in theseareas in August and September 2020. In addition, in October of 2020, small fish were collected foranalysis of PCBs in fish tissue. * A sample was not able to be collected from OF-12, or between the outfall and the stream, so this sample was taken in creek sediments where the outfall spills. ** These samples were analyzed via EPA Method 1668. ", "geometryType": "esriGeometryPoint", "sourceSpatialReference": { "wkid": 102100, "latestWkid": 3857, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -20037700, "falseY": -30241100, "xyUnits": 10000, "falseZ": -100000, "zUnits": 10000, "falseM": -100000, "mUnits": 10000 }, "copyrightText": "Elizabeth Green (Retired)\nBenjamin J. 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The location where each sediment sample was collected is shown on Figure 4. Table 3provides the sample identifications, northing and easting, sampling date, sampling method, and adescription of the sampling location, in addition to any changes to the sampling location from theproposed location. Samples were collected from four locations within HR, nine locations fromLBC, 18 locations from NEB, 14 locations from NWB, and ten locations from WB, for a total of55 locations sampled. A total of three duplicate samples and three matrix spike (MS) and matrixspike duplicate (MSD) samples were also collected during this investigation, resulting in a totalof 64 samples collected.Collected bottom sediment samples (top 6 inches of sediment) from 55 locations inthe five major tributariesï‚´ Analyzed for following compounds:ï‚´PCB Congenersï‚´Dioxins and Furansï‚´Parent and alkylated PAHsï‚´Pesticidesï‚´Mercuryï‚´Also analyzed for TOC and grain size", "geometryType": "esriGeometryPoint", "sourceSpatialReference": { "wkid": 102100, "latestWkid": 3857, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -20037700, "falseY": -30241100, "xyUnits": 10000, "falseZ": -100000, "zUnits": 10000, "falseM": 0, "mUnits": 1 }, "copyrightText": "Donna Davies\nCERCLA Project Manager\n484-663-1043\n\nhttps://app.box.com/s/6cqd7wu1a87fqkd3sggrwhsorr5xi48t/folder/217792400050", "parentLayer": { "id": 7, "name": "NPS" }, "subLayers": [], "minScale": 0, "maxScale": 0, 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The location where each sediment sample was collected is shown on Figure 4. Table 3provides the sample identifications, northing and easting, sampling date, sampling method, and adescription of the sampling location, in addition to any changes to the sampling location from theproposed location. Samples were collected from four locations within HR, nine locations fromLBC, 18 locations from NEB, 14 locations from NWB, and ten locations from WB, for a total of55 locations sampled. A total of three duplicate samples and three matrix spike (MS) and matrixspike duplicate (MSD) samples were also collected during this investigation, resulting in a totalof 64 samples collected.Collected bottom sediment samples (top 6 inches of sediment) from 55 locations inthe five major tributariesï‚´ Analyzed for following compounds:ï‚´PCB Congenersï‚´Dioxins and Furansï‚´Parent and alkylated PAHsï‚´Pesticidesï‚´Mercuryï‚´Also analyzed for TOC and grain size", "geometryType": "esriGeometryPoint", "sourceSpatialReference": { "wkid": 102100, "latestWkid": 3857, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -20037700, "falseY": -30241100, "xyUnits": 10000, "falseZ": -100000, "zUnits": 10000, "falseM": 0, "mUnits": 1 }, "copyrightText": "Donna Davies\nCERCLA Project Manager\n484-663-1043\n\nhttps://app.box.com/s/6cqd7wu1a87fqkd3sggrwhsorr5xi48t/folder/217792400050", "parentLayer": { "id": 7, "name": "NPS" }, "subLayers": [], "minScale": 0, "maxScale": 0, 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The samplers are placed in a metal mesh envelope which is attached to a u-post to secure the sampler to the location site. The samplers were positioned to sample the overlying water in the creek. Nine samplers were deployed in LBC, and three samplers were deployed in smaller tributaries that feed into LBC, to identify areas of elevated PCB concentrations in the surface water. Only surface water passive samplers were deployed (i.e., no porewater samplers were deployed in this project). The samplers were deployed on April 17th, 2024 and retrieved on June 18th, 2024, for a total deployment time of 62 days. The samplers were taken back to the Ghosh lab at UMBC where PCBs were extracted from the passive samplers with hexane, treated with copper to remove sulfur from the samples, and run through a silica gel column to remove organic compounds that interfere with PCB detection on the analytical machinery. The samples were run on a Agilent 6890N Gas Chromatograph with electron capture detection for quantification and data analysis. The measurements were converted to freely dissolved water concentrations using the sample concentration, the partition coefficient between water and the sampler, and corrected for non-equilibrium using Performance Reference Compounds (PRCs) pre-loaded on the passive samplers. Standard Operating Procedure (SOP) developed by the Ghosh lab are available for each of these sample preparation and analytical methods. ", "geometryType": "esriGeometryPoint", "sourceSpatialReference": { "wkid": 102100, "latestWkid": 3857, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -20037700, "falseY": -30241100, "xyUnits": 10000, "falseZ": -100000, "zUnits": 10000, "falseM": -100000, "mUnits": 10000 }, "copyrightText": "Ben Marino, Upal Ghosh, Nathalie Lombard, Yu Ting, Jasmine Ives, and Eswar Chandra. 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Storm sampling involved collecting large-volume (60- to 70-liter) composite samples, then removing sediment by filtration in the laboratory. Low-flow samples were obtained by filtering streamwater directly in the field. Continuously recording data sondes were deployed throughout the study to measure turbidity and other water-quality characteristics. During sampling, multiple discrete samples of streamwater were collected to determine suspended-sediment concentration (SSC) and particulate organic carbon (POC) concentration. Shortly after each storm, bed sediment was collected for chemical analysis.Sediment samples were analyzed for 209 polychlorinated biphenyl (PCB) congeners; 35 polyaromatic hydrocarbon (PAH) compounds, including 20 nonalkylated and 15 alkylated species; and 20 organochlorine pesticide (OP) compounds. 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