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pg. 9 Introduction 11 Purpose and scope  13 Study area 14 Methods 15 Sample collection 15 Sample preparation and analysis  16 Elemental analyses 17 Results and discussion  17 Pilot site  17 Main site  24 Petaluma tidal marsh restoration project 28 Adjacent marshland tidal marsh channels  30 Conclusions 34 Acknowledgment 35 References 35 FIGURES 1. Tidal wetlands in 1848 in San Francisco Bay  65 2. Map showing location of the Sonoma Bay lands Demonstration Project site  66 3. The Sonoma Baylands Wetland Demonstration Project 67 4. The Petaluma Tidal Marsh Restoration Project 68 5. Distributions of aliphatic hydrocarbons in sediment cores from the Pilot site and the adjacent marshland reference sites  69 6. (a) Concentrations of total PAHs in surficial sediments of the Pilot and adjacent marshland reference sites. ER-L (Effects Range-Low) and ER-M (Effects Range-Medium) concentrations for total PAHs. (b) Concentrations of total DDTs in surficial sediments of the Pilot and adjacent marshland reference sites. ER-L (Effects Range-Low) and ER-M (Effects Range-Medium) concentrations for total DDTs  70 7. Distributions of aliphatic hydrocarbons in sediment cores from the Main site, the Petaluma Tidal Marsh Restoration Project, and reference sites in the adjacent marshlands  71 8. (a) Concentrations of total PAHs in surficial sediments of the Main site and adjacent marshland reference sites. ER-L (Effects Range-Low) concentrations for total PAHs. (b) Concentrations of total DDTs in surficial sediments of the Main and adjacent marshland reference sites. ERL (Effects Range-Low) and (ER-M) Effects Range-Medium concentrations for total DDTs  72 9. (a) Concentrations of total PAHs in surficial sediments of the Petaluma tidal Marsh Restoration Project site. ER-L (Effects Range-Low) and ERM (Effects Range-Medium) concentrations for total PAHs. (b) Concentrations of total DDTs in surficial sediments of the Petaluma Tidal Marsh Restoration Project site. ER-L (Effects Range-Low) and ER-M (Effects Range-Medium) concentrations for total DDTs  73 10. Sampling locations of benthic sediments in tidal marsh channels in the marshlands adjacent to the SBWDP site  74 11. Distributions of aliphatic hydrocarbons in benthic sediments of tidal marsh channels in the marshland adjacent to the SBWDP site  75 12. (a) Concentrations of total PAHs in benthic sediments of tidal marsh channels in the marshlands adjacent to the SBWDP site. ER-L (Effects Range-Low) and ER-M (Effects Range-Medium) concentrations for total PAHs. (b) Concentrations of total DDTs in benthic sediments of tidal marsh channels in the marshlands adjacent to the SBWDP site. ER-L (Effects Range-Low) and ER-M (Effects Range-Medium) concentrations for total DDTs  76 13. Relation between total organic carbon (TOC) and total alkanes in benthic sediments of tidal marsh channels in the marshlands adjacent to the SBWDP site  77 14. Relation between total organic carbon (TOC) and total PAHs in benthic sediments of tidal marsh channels in the marshlands adjacent to the SBWDP site 78 15. Relation between total alkanes and total DDTs in benthic sediments of tidal marsh channels in the marshlands adjacent to the SBWDP site  79 16. Relation between total organic carbon (TOC) and total DDTs in benthic sediments of tidal marsh channels in the marshlands adjacent to the SBWDP site of tidal marsh channels in the marshlands  80

u.s. geological survey open file report/open-file report

Geochemical studies of anthropogenic and natural organic compounds at the Sonoma Baylands Wetland Demonstration Project site and adjacent marshlands, Sonoma County, California