POLYNUCLEAR AROMATIC HYDROCARBONS

REQUEST FULL CASE STUDIES HERE



 



select







Railroad Maintenance Facility

ISOTEC CASE STUDY 13

   Request Case Study

Site Location: North Creek, NY
Contamination: Petroleum hydrocarbons in soil.
Geology: Saturated sand and gravel, located 20 feet from banks of Hudson River.
Area Treated: 13,800 Sq. ft area at 2.5-12 fbgs vertical depth interval. Depth to water approximately 8 - 10 ft bgs.
Effectiveness:  Total VOCs reduced by 83.1% & PAHs by 81.5%. Site received Case closure. Project received Grand Conceptor Award and National Recognition Award.

Former MGP Site

ISOTEC CASE STUDY 21

   Request Case Study

Site Location: Long Beach, CA
Contamination: PAHs (2,484 mg/kg) including Benzo(a)Pyrene (100 mg/kg, 340 ug/l), and TPH (27,800 mg/kg, 912,000 ug/l).
Geology: Fill material overlying poorly sorted medium to fine grain sand; water table at approximately 10 ft bgs.
Area Treated: Approximately 3,000 Sq. ft area at 7-12.5 ft bgs vertical depth interval.
Effectiveness:  In soil, TPH reduced by 58%, BaP equivalent by 89%; TPH & PAHs were ND in groundwater.

Former MGP Site

ISOTEC CASE STUDY 23

   Request Case Study

Site Location: Long Island, NY
Contamination: VOCs, primarily BTEX & Naphthalene (BTEX 501,000 ppm in soil, 300 ppm in GW).
Geology: Fine to coarse grain sand with gravels underlain by 2-6 ft thick peat layer.
Area Treated: Approximately 29,200 sq. ft at an interval of 5-12 ft bgs.
Effectiveness:  Site-wide BTEX & Naphthalene in soil were reduced from 644,498 ppm to 12 ppm. This site is currently undergoing a long term monitoring program under NYSDEC review.

Naval Air Station

ISOTEC CASE STUDY 28

   Request Case Study

Site Location: Mechanicsburg, PA
Contamination: Bedrock aquifer impacted with VOCs, SVOCs, PAHs, PCBs and pesticides. Primary site COCs include Chlorobenzene (817 ug/l), cis-1,2-Dichloroethene (1,673 ug/l), 1,4–Dichlorobenzene (51 ug/l), Vinyl Chloride (141ug/l) and Trichloroethene (3,712 ug/l).
Geology: Clay and silt extends from ground surface to 30 ft bgs underlain by fractured limestone bedrock. Depth to groundwater is approx. 30 ft bgs; hydraulic conductivity is between 4.3x10-4 cm/sec and 8.6x10-3 cm/sec.
Area Treated: Approx. 130,000 Sq. ft total area. Target treatment zone ranged from approx. 30 ft bgs to 100 ft bgs within the fractured bedrock.
Effectiveness:  87% site-wide reduction of VOCs from average baseline. 20 wells sampled. CB below RGs in 15, 1,2-DCE and VC below RGs in 12 wells, TCE below RGs in 8 wells, Aroclor 1260 below RGs in 14 wells, 1,4-DCB below RGs in 19 wells, 4,4-DDT below RGs in 18 wells and alpha-BHC below RGs in 19 wells.

Nyack MGP Site

ISOTEC CASE STUDY 29

   Request Case Study

Site Location: Nyack, NY
Contamination: Bedrock contaminated with non-aqueous phase liquid (NAPL) and MGP-related compounds. Primary contaminants of concern (COCs) include volatile organic compounds (VOCs), poly-nuclear aromatic hydrocarbons (PAHs) and total petroleum hydrocarbons (TPH). Levels of COCs reached 6 ppm for VOCs and 1,200 ppm for PAHs in dissolved phase and 8,500 ppm for VOCs, 36,000 ppm for PAHs and 900,000 ppm for TPH in NAPL.
Geology: Fractured Bedrock.
Area Treated: ~36,000 cubic yards consisting of a 20 foot interval of an impacted bedrock zone.
Effectiveness:  Successfully treated a large portion of the free phase NAPL present in the bedrock. The entire project was completed ahead of the schedule and under the budget (the total cost of the treatment program was approx. $300,000). The project was given a "Award of Merit" by New York Construction Magazine in 2007.

Active Air Force Base

ISOTEC CASE STUDY 35

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 5th full-scale injection event. The 10 compliance wells selected for the site performance criteria remediation goals showed reductions ranging from 70%-99%.

Former MGP Site

ISOTEC CASE STUDY 37

   Request Case Study

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.

Former MGP Site

ISOTEC CASE STUDY 64

   Request Case Study

Site Location: Yonkers, New York
Contamination: BTEX; PAHs
Geology: Site geology consists of silty sand from the ground surface to approximately 17 ft bgs leading into a glacial till zone. Bedrock is encountered at around 21-29 ft bgs. Depth to water is approximately 10-12 ft bgs.
Area Treated: Two treatment areas. Area A =~3,600 ft2 from 9.5-26ft bgs; 21 IW's. Area B =~7,000 ft2 from 10-26 ft bgs; 54 IW's.
Effectiveness:  Post-treatment success will be evaluated by the client with sampling scheduled in the next few months.