MTCA Science Advisory Board Presentation Establishing Moderate Soil Levels for Arsenic October 23, 2006.

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Presentation transcript:

MTCA Science Advisory Board Presentation Establishing Moderate Soil Levels for Arsenic October 23, 2006

Tacoma Smelter

Pesticide Applications

Yakima County Historic Orchards

Arsenic and Lead Mobility Metal concentration Metal speciation Soil redox and pH conditions Precipitation Soil composition and permeability Other (i.e., application of phosphate fertilizers)

Arsenate Column Experiment

Arsenite Column Experiment

Field Data as an Indicator of Arsenic and Lead Mobility

Soil Profiles Near the Tacoma Smelter LeadArsenic

Soil Profiles – Central, WA

Old Yakima Orchard Concentrations w/ Depth

Groundwater Data No Specific combined GW/Soil study However on Vashon – lots of soil data and lots of GW Data 22 Group A systems 137 Group B systems 50 to 75 % of Group A and B systems receive water from 25 ft or less DOH and King County Databases

WDOH Database

Equilibrium Partitioning Model Where: C s = Soil Concentration (mg/kg) C w = Groundwater concentration or cleanup level (μg/L) USF= Unit conversion factor (1 mg/1,000 μg) DF= Dilution factor (dimensionless: 20 for unsaturated zone soil) K d = Distribution coefficient (L/kg) θ w = Water-filled soil porosity (mL water/mL soil: 0.3 for unsaturated soil) P b = Dry soil bulk density (1.5 kg/L)

K d - Distribution Coefficient Soil (mg/kg) Water (mg/L) Container K d = Water (mg/L) Soil (mg/kg) = L/kg

K d - Arsenic Examples of K d values reported in literature reviews

K d - Lead Examples of K d values reported in literature reviews

Equilibrium Partitioning Model C W (K d of 29, MTCA) = 43 μg/L C W (K d of 2512, EPA median) = 0.50 μg/L C W (K d of 1585, EPA mean) = 0.79 μg/L C W (K d of 1825, Sauve median) = 0.68 μg/L C W (K d of 13119, Sauve mean) = 0.10 μg/L Arsenic (C S = 25 mg/kg)

Equilibrium Partitioning Model C W (K d of 2,510) = 5 μg/L Arsenic (C S = 251 mg/kg)