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• +� <br /> GEE <br /> GENESIS ENGINEERING 8 REDEVELOPMENT <br /> 2.4.1 Surface Water Sampling <br /> Surface water samples will be collected from on-Site and off-site reference locations in 7 <br /> aquatic regimes. Surface water samples will be collected to characterize the general aqueous <br /> environment. Surface water sampling will include both pond and stream reference sites. The <br /> hydrologic regimes of interest include: <br /> 1. Waste Treatment Pond <br /> 2. Holding Pond <br /> 3. Drainages Ditch—N. Thornton Road <br /> 4. Drainages Ditch—Royal Road <br /> 5. Drainages Ditch—Between Royal Road and Main Buildings <br /> 6. Reference Streams <br /> 7. Reference Ponds <br /> In addition to the constituents listed above, surface water testing will focus on surface water <br /> characterization parameters including: pH, conductivity, and dissolved oxygen. <br /> 2.4.2 Sediment Sampling <br /> The number and location of sediment samples (i.e., sample stations)that will be collected <br /> from on-site and off-site locations will be finalized during Site reconnaissance activities. The <br /> sediment samples will be collected in sediment regimes that represent different hydrologic, <br /> biologic, or sediment deposition environments. Sample locations in each hydrologic regime <br /> will be selected to adequately define spatial variability for that regime. Sampling will consist <br /> of multi-depth sediment collection where feasible. Because of the potential for highly <br /> variable field conditions, actual sample locations and depths may vary slightly from those <br /> determine during site reconnaissance. A global satellite positioning system (GPS) will be <br /> used to locate sampling sites to the nearest 1-3 meters. <br /> A total of five characteristic sediment regimes, including two reference types (ponds and <br /> sloughs), have been identified based on a review site features and local hydrology. Each of <br /> these regimes has specific location, hydrology, or water quality conditions such that sediment <br /> and biologic conditions may be expected to significantly differ. Representative samples will <br /> be collected from each identified regime. Data representative of each regime will be <br /> sufficient to characterize impacts to that regime and permit characterization of exposure <br /> pathways for risk determination. Where test and field data indicate equivalent conditions, <br /> individual sediment regime datasets may be combined. <br /> Lima Ranch 5 of 17 <br /> Site Characterization Work Plan Addendum <br /> April 2008 <br />