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Manufactured Gas Plant (MGP) Case Studies
Case Studies > MGP-Related
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Nyack MGP Site |
| Site Location: |
Nyack, NY |
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Article
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| 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 20 feet thickness 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. |
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Former MGP Site, NY |
| Site Location: |
Long Island, NY |
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| Contamination: |
VOCs,
primarily BTEX & Naphthalene (501,000 ppm in soil & 302 ppm in groundwater) |
| Geology: |
Fine to coarse
grain sand with gravels; water table at approximately 3 ft bgs
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| 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 |
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Former MGP Site, CA |
| Site Location: |
Long Beach, California |
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| 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 |
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