 |
 |
 | |
    |
|
ENVIRONMENTAL CONSTRUCTION AND REMEDIATION Groundwater Collection/Barrier Design and construction of a Groundwater Collection/Barrier Wall System to eliminate potentially contaminated groundwater from migrating into an existing wetland area and facilitate groundwater extraction for treatment. Work performed by Geo-Con included clearing and grubbing, work platform construction, leachate interceptor trench/barrier wall construction and site restoration.
The constructed leachate interceptor/barrier wall system consisted of two 30-inch wide trench segments with a total length of 1,200 feet. The two segments installed had a fascial area of 24,720 square feet with depths ranging from 15 feet to 25 feet. Each segment was equipped with one 48-inch diameter HDPE sump and one clean-out. The sump and the clean-out were hydraulically connected to each other through a horizontal 4-inch diameter perforated HDPE drainage pipe that was wrapped with a woven geotextile fabric and installed along the trench bottom. A liner system was installed along the down gradient side of the trench. This system consisted of a series of 80 mil HDPE interlocking panels with hypertite sealant installed at the interlocks. The trench was backfilled with washed concrete sand and capped with a non-woven geotextile fabric and 2.0 feet of soil cover.
Equipment used in trench construction consisted of a Kobelco Mark 400 Excavator, slurry batch plant, two Cat 960 Loaders, Cat D-3 Bulldozer, tremie pipes with hoppers, and steel frames for liner system installation.
|
 |
