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• ' GEOMATMX Chemical Analysis of Dredged Material Samples of the dredged material will be analyzed for the COCs identified in Task 2, 3 and 4 to evaluate the potential impact on local groundwater. The analyses will include dissolved concentrations of barium, copper, lead, and zinc, as well as analysis of the acid generation _ potential of the dredged material. Collection and analytical costs for dredged material are not included in this work plan and are assumed to be part of the Port's scope. Chemical Analysis of Placement Area Soil Soil samples will be collected from the DPS for laboratory analysis of soil pH and dissolved concentrations of lead, copper, barium, and zinc and acid generation/neutralization potential. Chemical Analysis of Overflow Area Soil Soil samples will be collected from the overflow area located north of the DPS for analysis of cation exchange capacity, pH, and organic carbon content. Samples will also be analyzed for dissolved concentrations of barium, copper, lead, and zinc and acid generation/neutralization ' potential. The results of the chemical analyses will be evaluated using the using the California Regional Water Quality Control Board's Designated Level Methodology. The deliverable for this task will be a summary letter assessing whether the dredged material is suitable for placement at the DPS and if the material may provide a threat to waters of the state. ' 2.6 TASK 6: EVALUATE ACID GENERATION POTENTIAL This task will provide the basis for assessing the acid generation potential of the dredge material and the ability of the DPS soils to attenuate any acid generation potential that may be present in the dredge material. The acid production potential of the dredge material will be evaluated using the Modified Acid Generation Potential Test Procedure. This procedure requires speciation of the various sulfur rspecies and evaluates acid generation potential based on readily oxidizable sulfide Y concentrations that are measured by the method. If the material has significant acid generation ' potential then the material would be submitted to the Modified Humidity Cell Test Procedure. That procedure takes approximately 20 weeks to evaluate the material under controlled cycles ' consisting of aeration with dry air(3 days), aeration with humidified air(3 days), and saturation _ of the sample with de-ionized water (1 day). The 7-day cycle is repeated for the 20-week ' period. ' I:\PROJECn6000s\6988.000\6988-10.doc 5