Hawthorne Army Depot

HWAAP-C01A & C01B
BUILDING 102-31 ROTARY DEACTIVATION FURNACE

SITE DESCRIPTION
HWAAP-C01A & B are incinerators operated from 1968 to 1983 to deactivate small arms ammunition, primers and fuses. Prior to 1980, these furnaces emitted particulates to the atmosphere. After 1980, the incinerators were retrofit with cyclone separators and bag houses. Investigation activities completed in 1994 included 101 surface soil samples in a 20 foot grid and 18 subsurface soil samples from 6 cone penetrometer soundings.  

Lead was found in 59 surface samples above 1,200 mg/kg to 200,000 mg/kg. No elevated concentrations of lead were found in the subsurface samples. Due to the location and proximity of personnel and the high lead levels a pilot treatability study for lead stabilization was completed in 1999.

Soil with lead concentrations greater than 2000 mg/kg within the top one foot of surface soils was treated in situ with a phosphate chemical mixture. Treated soil was excavated and disposed of in a borrow pit at HWAD. The borrow pit was capped. The site was backfilled and hydroseeded. There was a potential for lead dust to be deposited on the ballast along the railroad tracks. NDEP agreed that the ballast could be treated in situ provided it was treated with twice the treatment dose of the phosphate mixture used to treat surface soils. All of the soil with elevated lead concentrations within the treatment boundary was excavated and disposed.

Aerial Photo (black & white --170KB)

PROPOSED PLAN
A Closure Decision Document was approved by the NDEP in November 2001.

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