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(presumably containing CCA-treated wood)

Groundwater Analysis From Florida C&D Landfills. (presumably containing CCA-treated wood). Florida Groundwater C&D Facilities Sampling Method. Determine As conc in GW near C&D facilities: 21 C&D debris facilites 16 Florida counties 23 background wells 48 compliance/detection wells

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(presumably containing CCA-treated wood)

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  1. Groundwater Analysis From Florida C&D Landfills (presumably containing CCA-treated wood)

  2. Florida Groundwater C&D Facilities Sampling Method • Determine As conc in GW near C&D facilities: • 21 C&D debris facilites • 16 Florida counties • 23 background wells • 48 compliance/detection wells • Speciation analysis

  3. 0.09 Total As (HPLC-ICP-MS) 0.08 Total As (Lab) 0.07 0.06 0.05 Total As (mg/L) 0.04 0.03 0.02 0.01 0.00 2 8 13 27 31 37 41 47 53 57 63 69 Well # C&D Background Wells (As > 5 mg/L in 8 of 23) Florida GW background 2 mg/L Avg. As Conc. 7 mg/L

  4. Total As (HPLC-ICP-MS) Total As (Lab) C&D Compliance/Detection Wells (Detectable As - 32 of 48) 0.18 0.16 0.14 0.12 Florida GW background 2 mg/L Avg. As Conc. 10 mg/L 0.10 Total As (mg/L) 0.08 0.06 0.04 0.02 0.00 1 5 11 15 19 22 25 30 35 40 45 49 55 59 64 68 Elevated Background No Background Well Low Background Well #

  5. C&D Groundwater As Speciation Compliance/Detection Wells 0.05 Florida GW background = 0.002 mg/L As(III) 0.04 DMAA 0.04 MMAA 0.03 As(V) 0.03 As Species Conc. (mg/L) 0.02 0.02 0.01 0.01 0.00 1 4 7 11 14 17 19 21 23 29 35 39 43 49 61 64 Well # Elevated Background No Background Well Low Background

  6. Conclusion Arsenic in Groundwater • Avg.backgr./compli./detect. = 7- 10 mg/L • Florida background = 2 mg/L • Various species predominate species • Results currently suggestive of some As contamination but data set is not statistically robust • It takes time for As to migrate

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