Soil Mixing Oxidation at a Former Manufacturing Facility (ISOTEC Case Study 65) - Former Manufacturing Facility, Northern, WI

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·   Former Manufacturing Facility; Northern Wisconsin.

Contaminants of Concern

·   TCE soil levels as high as 140,000 ug/kg.

Geology/ Hydrology

·   Site geology consists of mostly clay from 0-15 feet bgs underlain by a mostly sand unit from 15-30 feet bgs. 

·   Depth to water is approximately 25-30 feet bgs.

ISCO Soil Mixing Program

·   Sodium Hydroxide Activated Sodium Persulfate (ALK-ASP).

·   ALK-ASP concentration of ~15% utilized. 

·   ~13,500 sq. ft area from 0-15 ft bgs within the upper clay unit and ~11,700 sq. ft area from 15-30 ft bgs within the lower sand unit.

·   Treatment areas broken down into 10 x 10 ft cells based on pre-treatment TCE values.

·   Treatment approach included initial excavation and stockpiling of upper clay unit; treatment of the lower sand unit; re-placement of the stockpiled upper clay unit into specific groups based on pre-treatment TCE concentration followed by treatment of the lower sand unit.

·   Approximately 194,973 gallons of ALK-ASP were mixed into both soil units utilizing the Lang Tool dual axis blender over 31 days.

·   Reagent included 270,600 lbs. sodium persulfate activated by approximately 54,300 gallons of 50% sodium hydroxide.

·   Confirmatory sampling conducted throughout the soil mixing program to gauge project effectiveness and allow for any field changes if necessary.

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