|
|
FDEP Facility # 508514224
This project is located in
West Palm Beach, Florida at the site of a former gas station. This
location is currently operating as a maintenance facility. An old
leaking gasoline tank had been removed but the contaminated soil
surrounding the tank was left in place. As a result this had also
affected the groundwater.
The site was reported to
have moderate levels of contamination in the soil and groundwater.
BioWorld treated to a depth of 30 feet. The delineated groundwater
contamination was estimated to be approximately
12'x100'x30' and soil contamination at
50'x40'x10'. The lithology of
the site consisted of sandy soil.
Contaminant
Gasoline
Treatment Method
In-Situ
Remediation Time Frame
10
months
BioWorld initiated the remediation of this site
utilizing 30 specialized high-pressure rod injections to treat the soil.
1 month later, the groundwater was treated using 22 injection wells
installed to a depth of 30 feet, screened 10' to 30'.
Subsequent similar groundwater treatments took place, at 3 additional
times with a month interval between each.
|
|
Starting Contaminant Levels
|
Sampling Point |
Benzene |
Toluene |
EB |
Xylene |
MTBE |
Total Nap |
|
HM-1 |
161 |
111 |
130 |
151 |
17 |
18.7 |
|
HM-9 |
1,070 |
2,850 |
415 |
3,160 |
25.1 |
8.1 |
|
HM-10 |
101 |
4 |
42.7 |
190.9 |
8 |
8.1 |
|
MW-12 |
BDL |
BDL |
BDL |
BDL |
BDL |
BDL |
BDL - below detection levels
Testing standards
All tests were performed
by an independent 3rd party laboratory.
Methods
5030/8021B - VOA (602)
Compounds in Water by G.C)
3510/8270C - PAHs (610)
in Water by GC/MS (ion trap)
Five months after the project started, analytical
data indicated that the above treatments had apparently broken loose
pocket/s of contamination that were at much higher levels than
previously identified. This resulted in the total contamination
increasing radically in several monitoring wells. In the most
contaminated monitoring well, HM-9, the levels exceeded 40,000 ug/l.
BioWorld determined that a more aggressive treatment
schedule would be implemented to combat these elevated levels. As a result
BioWorld treated the site every week, for a seven week period.
|