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Streambed Remediation/Wetlands Restoration
Project-Petticoat Creek
Southern New Jersey,
Project Value: $570,000
Environmental Liability Management-Jeff Amant
Phone: 215-794-6920
In March 2002 Enviro-Air was contracted to remediate two sections of streambed totaling approximately 600 linear feet. The stream was located in low-lying wetlands and flowed into a tidal river. The project goal was to excavate 3-4 feet of oily sediments (approximately 4,500 cubic yards) from the bottom of the streambed without destroying too much of the wetlands that bordered both sides of the stream. After removal of the contaminated sediments, the stream bank was stabilized using 12 inch by 20-foot long coconut logs.
Utilizing 9 pumps of various sizes, 600 linear feet of 12-inch pipe, Enviro-Air rerouted the stream around the remediation areas, leaving the areas to be excavated somewhat dry. The pumps were kept running 24 hours per day. The water intrusion continued due to the large number of underground springs that fed the stream. Dewatering sumps were placed upstream of the excavation areas to keep the streambed dry. Because the dewatering sumps were located in the excavation area the water was contaminated with oil. As a result these dewatering sumps pumped the water into a series of 20,000-gallon temporary storage tanks that settled out the solids before the material was removed by vacuum truck and put into an onsite oil water separator. Enviro-Air utilized a 65-foot long reach excavator to excavate the contaminated sediments. The sediments were loaded into an articulated dump truck and hauled approximately one mile to a stabilization area. In the stabilization area the sediments were allowed to drain and then they were mixed with cement kiln dust for stabilization. After the sediments were stabilized, they were shipped to a thermal treatment plant.
Two sections of the stream were remediated and a half of an acre of wetlands were restored. The project was completed in less than 60 days.
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24/7 Dewatering and Stream Diversion |
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On-Site Solid/Oil Water Separation |
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4,500 yd3 of Oily Sediments Removed from the Stream Bed |
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Contaminated Sediments Stabilized and Recycled Off-Site |
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Stream Bank Restoration (60- 12” x 20’ koir logs, 7,200 ft2 koir matting) |
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Half of a Acre of Wetland Restoration (One hundred native
wetland plants) |
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