MANUFACTURED GAS PLANTS

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Former MGP Site

ISOTEC CASE STUDY 21

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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

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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.

Nyack MGP Site

ISOTEC CASE STUDY 29

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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.

Former MGP Site

ISOTEC CASE STUDY 37

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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

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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.