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Comparing Current and Historic Results

2010 McCormick & Baxter Groundwater Sample Results. Comparing Current and Historic Results. Oregon DEQ, Hart Crowser, Inc., and GSI Water Solutions. Groundwater Monitoring Wells Current vs. Historic Results (TPAHs). MW-35r: Current vs. Historic Results.

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Comparing Current and Historic Results

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  1. 2010 McCormick & Baxter • Groundwater Sample Results Comparing Current and Historic Results Oregon DEQ, Hart Crowser, Inc., and GSI Water Solutions

  2. Groundwater Monitoring WellsCurrent vs. Historic Results (TPAHs)

  3. MW-35r: Current vs. Historic Results PAHs detected at much lower detection limits PCP = ND Metals = Similar

  4. MW-37s: Current vs. Historic Results LPAHs are an order of magnitude higher cPAHs are ND (lower) PCP is higher Metals are low and similar to 2006

  5. MW-37i: Current vs. Historic Results LPAHs = lower CPAHs = ND PCP = ND Metals = similar

  6. MW-37d: Current vs. Historic Results LPAHs = lower cPAHs = ND PCP = ND Metals = lower except Zn

  7. MW-39s: Current vs. Historic Results LPAHs = lower cPAHs = 2010 ND (lower) PCP = ND Metals = lower

  8. MW-41s: Current vs. Historic Results LPAHs = lower cPAHs = 2010 ND lower PCP = ND Metals = lower

  9. MW-47s: Current vs. Historic Results LPAHs = similar cPAHs = ND PCP = ND Metals = similar

  10. MW-53s: Current vs. Historic Results LPAHs = similar cPAHs = ND PCP = 2 orders of magnitude lower Metals = similar

  11. MW-55s: Current vs. Historic Results LPAHs = lower cPAHs = ND PCP = ND Metals = similar Cu higher

  12. MW-58s: Current vs. Historic Results LPAHs = lower cPAHs = ND PCP = ND Metals = lower/similar

  13. MW-19s: Current vs. Historic Results LPAHs = similar to lower cPAHs = similar? (lower detection limits) PCP = similar Metals = slightly higher

  14. Conclusions for Groundwater Sampling • Concentrations generally are lower with isolated increases; however generally in same ranges • Recommend no immediate term groundwater sampling unless associated with DNAPL Recovery System • Groundwater is not expected to change in concentrations for a long time – perhaps sample again in 20 years? – Team discussion

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