Table 1. Information on Five Full-Scale Permeable Reactive Barriers

Site
 Industrial facility, Mountainview, California Industrial facility, Belfast, Northern Ireland Industrial facility, Coffeyville, Kansas USCG facility, Elizabeth City, North Carolina Government facility, Lakewood, Colorado
Installation Date Sept. 1995 Dec. 1995 Jan. 1996 June 1995 Oct. 1996
Contaminant & high conc. Design 2 mg/L cDCE 300 mg/L TCE 400 µg/L TCE 10 mg/L TCE
10 mg/L Cr(VI)		 700 µg/L each TCE & DCE
15 µg/L VC
Reactive Wall Type Excavate & fill Reaction Vessel Funnel & Gate Continuous Trench Funnel & Multiple Gate
Funnel Material Not Applicable Slurry Walls Soil-Bentonite Slurry Not Applicable Sealable Joint Sheet Pilings
Funnel Length Not Applicable 100 ft + 100 ft 490 ft + 490 ft Not Applicable 1040 ft total
No. Of Gates Not Applicable 1 Reaction vessel 1 Not Applicable 4
Reactive Material Fe metal Fe metal Fe metal Fe metal Fe metal
Reactive Zone Height 5 ft 16 ft in vessel 11 ft Approx. 23 ft 10-15 ft
Reactive Zone Length 44 ft NA 20 ft 150 ft 40 ft each
(4 x 40 = 160)
Reactive Zone Thickness 4.5 ft 16 ft in vessel 3 ft 2 ft Gates differed, low = 2 ft
high = 6 ft
Total Mass of Reactant 90 tons 15 tons 70 tons 450 tons No Information
Treatment Wall Depth 15 to 20 ft bgs 18 to 40 ft bgs 17 to 28 ft bgs 3 to 26 ft bgs 10-15 to
20-25 ft bgs
Total System Length 44 ft Approx. 200 ft 1000 ft 150 ft 1200 ft
Special Features &Mis. HDPE atop Fe to surface upgradient directs H2O through Fe Walls direct H2O to vessel inlet, gravity flow to outlet downgradient Two contam. treated. Chain trencher with immediate Fe placement Largest of its kind. Gates installed using sheet pile box.
Cost No Information $375 K $400 K $500 K No Information

Note: bgs = below ground surface

Table from U.S. EPA Remedial Technology Fact Sheet, EPA/600/F-97/008. The original information on these sites was provided by Mr. John Vogan of Envirometal Technologies, Inc.