Isotec - In Situ Oxidative Technologies Inc.

FEATURED FACILITY CASE STUDIES

These pdf files require Adobe Acrobat Reader to view. Download the free pdf reader.

Active Military Base (Isotec Case 38)
This site is an active military base in Virginia. Contaminants of concern at the site are volatile organic compounds, primarily carbon tetrachloride and chloroform.

Site Location: East Coast, United States
Contamination: Carbon Tetrachloride (500 µg/l ); and Chloroform (18 µg/l ) in groundwater.
Geology: Fine to medium silty and clayey sand matrix underlain by a sandy clay semi-confining unit at 35 feet bgs. Average hydraulic conductivity was 1.00 x 10 -4 cm/sec. The water table is approximately 4.5-12 ft bgs.
Area Treated: ~9,000 Sq. ft area at 20-35 ft bgs vertical depth interval.
Effectiveness: Treatment program results indicated an overall VOC destruction of 87% in the treatment area with chloroform being treated to ND values.

Download Case Study: Adobe Acrobat File (PDF)

Former Wood Product Mill (Isotec Case 48)
ISOTEC conducted an in-situ chemical oxidation remediation program for saturated soil and ground- water contamination at a former wood product mill in Arlington, Washington.

Site Location: Arlington, Washington
Contamination: Pentachlorophenol (PCP).
Geology: The subsurface at the site consists of interbedded silty sands and sandy silts to approximately 7 feet bgs. Medium to coarse sand was encountered from 7-16.5 feet bgs. Depth to GW ranged from 7.5-11 feet bgs.
Area Treated: Target treatment area was approximately 22,500 sq. feet covering the 11-17 feet bgs interval during the first event and the 7-16 feet bgs interval during event II. Approximately 140 temporary DP points were utilized to perform ISCO throughout the site.
Effectiveness: Average PCP concentration in groundwater was reduced by 91%.

Download Case Study: Adobe Acrobat File (PDF)

Vanderberg Air Force Base (Isotec Case 54)
ISOTEC was retained to conduct an in-situ chemical oxidation (ISCO) field pilot test program using stabilized 12% hydrogen peroxide and ISOTEC’s patented neutral pH catalyst at Installation Restoration Program (IRP) Site 50.

Site Location: California
Contamination: TCE impacted groundwater.
Geology: Subsurface is compromised of homogenous sands with a few thin silt and clay lenses to a depth of approximately 22 feet bgs, underlain by a clay layer. Depth to GW is approximately 11 feet bgs.
Area Treated: Target treatment area was approximately 10,000 sq. feet targeting the 12-16 and 16-21 feet bgs depth intervals.
Effectiveness: Average TCE concentrations were reduced by 87% throughout the site with one location showing a >99% reduction.

Download Case Study: Adobe Acrobat File (PDF)

Former Manufactured Gas Plant Site (Isotec Case 37)
The subject site is a former MGP site located in the Southeastern United States. Past business activities at the site
resulted in soil and groundwater impacts with MGP-related contamination. Heavier impacts of by-product like material (BPLM) have been found in some areas.

Site Location: Macon, Georgia
Contamination: Naphthalene, Benzene, Toluene, Ethylbenzene, Total Xylenes (BTEX), PAHs and by-product-like material (BPLM).
Geology: Fill material from 0.2-13 feet bgs underlain by alluvial deposits, which is underlain by saprolite. GW is encountered at varying depths throughout the site ranging from 6-25 feet bgs; flow is in the east-southeast direction.
Area Treated: Two areas; larger off-site area approximately 285 ft x 160 ft and the smaller on-site area 50 ft x 50 ft.
Effectiveness: Based on the operational criteria set forth for the site, majority of wells installed during Phase I have met their remedial requirements and no further injections into those areas are proposed.

Download Case Study: Adobe Acrobat File (PDF)

Superfund Site (Isotec Case 30)
The subject site is an active chemical manufacturing facility located in Indiana. Past business activities at the site resulted in soil and groundwater (GW) contamination with volatile organic compounds (VOCs) and petroleum hydrocarbons.

Site Location: Indiana
Contamination: Benzene, Toluene, Ethylbenzene, Xylenes (BTEX), Diesel Range Organics (DRO) and Gasoline Range Organics(GRO). Concentrations: GW levels as high as BTEX(9,700 ppb); DRO (21,000 ppb); and GRO (40,000 ppb). Soil levels as high as BTEX (1,000 ppb); DRO (2,100 ppb); and GRO (920 ppb).
Geology: Sands and gravel from surface to 3-6 fbgs, underlain by a 2-6 foot thick clay-silt peat layer, followed by fine to coarse sands to 24 fbgs.
Area Treated: ~36,000 Sq. ft total area. Target treatment zone ranged from ~14-20 ft bgs.
Effectiveness: For soil , COC reduction was achieved at all 12 monitoring locations with individual reduction rates ranging between 20% to greater than 99%. Total average soil concentration reduction rates ranged from 94% to greater than 99% for VOCs, DRO and GRO. For GW , COC reduction was achieved at 11 of 12 monitoring locations with reduction rates ranging from 15% to greater than 99%. Total average GW concentration reduction rates ranged from 68% to 83% for VOCs, DRO and GRO. Baseline versus post-treatment mass calculations estimated an approximately 5,719 lbs mass destruction in soils and groundwater within the target treatment area.

Download Case Study: Adobe Acrobat File (PDF)

Active Air Force Base (Isotec Case 35)
The subject site is a former horse pasture on an active air force base located in Georgia. The site sits on top of former Solid Waste Management Units (SWMU’s), a former trench and burn disposal area and miscellaneous fill areas. Past business activities at the site resulted in soil and groundwater (GW) contamination with volatile organic
compounds (VOCs) and petroleum hydrocarbons.

Site Location: Middle, Georgia
Contamination: VOCs including Chlorobenzene (7,412 µg/l ), TCE (2,455 µg/l ), cis-1,2-DCE (7,039 µg/l), DCB Isomers, arsenic, lead, cadmium, chromium and SVOCs including polycyclic aromatic hydrocarbons (PAHs).
Geology: Fill material consisting of clay, silt and sand from ground surface to a depth of approximately 10 feet bgs underlain by a clay unit to approximately 40 feet bgs.
Area Treated: Source area and plume (estimated to be 307,500 sq ft) . Target treatment interval from 30-50 feet bgs for majority of site and from 10-20 feet bgs for the southern most areas of the site.
Effectiveness: A 90% reduction in all 10 compliance wells was noted after 5 th full-scale injection event. The 10 compliance wells selected for the site performance criteria remediation goals showed reductions ranging from 70%-99%.

Download Case Study: Adobe Acrobat File (PDF)

Soil Oxidant Demand Experiment, Arvada, Colorado
ISOTEC conducted a soil oxidant demand (SOD) experiment using Modified Fenton’s Reagent (MFR) and Potassium Permanganate on saturated soil to evaluate the impact of SOD on the effectiveness of in-situ oxidation using MFR.

SOD Experiment: Using Modified Fenton's Reagent, Using Potassium Permanganate
Samples: Baseline 1, 2, 3, TOC and Well Sand, P-48 (Potassium Permanganate 48 hour), MFR 1, 2 and 3 dose
Geology: Sandy, silty-clay and fine sand, Saturated soil
Analysis: Total Organic Carbon (TOC), Soil Oxidant Demand (SOD)
Effectiveness: Average SOD in MFR treated and untreated saturated soil samples were indistinguishable. Total Organic Carbon results were also indistinguishable. Treatment with MFR does not impact SOD or TOC results.

Download Case Study: Adobe Acrobat File (PDF)