Here are some research articles (primary sources) containing studies similar to those you are conducting at LLELA.
Anderson, B., Hunt, J., Phillips, B., Thompson, B., Lowe, S., Taberski, K., & Scott Carr, R. (2007). Patterns and trends in sediment toxicity in the San Francisco Estuary. Environmental Research, 105(1), 145-155. doi:10.1016/j.envres.2006.07.005
Hudak, P. F., & Banks, K. E. (2006). Compositions of first flush and composite storm water runoff in small urban and rural watersheds, North-Central Texas. Urban Water Journal, 3(1), 43-49. doi:10.1080/15730620600578678
Hung, C., Warnken, K. W., & Santschi, P. H. (2005). A seasonal survey of carbohydrates and uronic acids in the Trinity River, Texas. Organic Geochemistry, 36(3), 463-474. doi:10.1016/j.orggeochem.2004.09.004
Slye, J. L., Kennedy, J. H., Johnson, D. R., Atkinson, S. F., Dyer, S. D., Ciarlo, M., . . . Price, B. B. (2011). Relationships between benthic macroinvertebrate community structure and geospatial habitat, in-stream water chemistry, and surfactants in the effluent-dominated Trinity River, Texas, USA. Environmental Toxicology & Chemistry, 30(5), 1127-1138. doi:10.1002/etc.483
Warnken, K. W., Gill, G. A., Dellapenna, T. M., Lehman, R. D., Harper, D. E., & Allison, M. A. (2003). The effects of shrimp trawling on sediment oxygen consumption and the fluxes of trace metals and nutrients from estuarine sediments. Estuarine Coastal & Shelf Science, 57(1), 25. doi:10.1016/S0272-7714(02)00316-5
Wen, L., Warnken, K. W., & Santschi, P. H. (2008). The role of organic carbon, iron, and aluminium oxyhydroxides as trace metal carriers: Comparison between the Trinity River and the Trinity River Estuary (Galveston Bay, Texas). Marine Chemistry, 112(1), 20-37. doi:10.1016/j.marchem.2008.06.003