SITE
Fuel Storage Area at the Verlite Industrial Facility, Tampa, FL
Facility ID 8625318
CONTAMINATION
BTEX and MTBE in groundwater
OBJECTIVE
The goal was to remove enough contaminants from the groundwater to obtain a No Further Action (NFA) for the site.
BACKGROUND
A leaking Underground Storage Tank (UST) had contaminated an area at the Verlite manufacturing facility. The two USTs were removed along with approximately 19 tons of impacted soil. Both Soil Vapor Extraction (SVE) and pump and treat systems were implemented to address the remaining groundwater contamination but could not get the site to closure.
REMEDIATION ACTIVITIES
An Air Sparge system installation was discussed, but due to the high cost it was decided to implement ISCO injections as a pilot feasibility test. One event of 2,200 gallons (2,400 pounds of activated 30% hydrogen peroxide equivalents) of EN Rx Reagent was injected into 4 wells- one recovery well, one injection well, and two monitoring wells. The event took place over two days and addressed both the tank pit and down gradient of the plume. The target wells are tabulated below.
All results in ug/L
GCTL = Groundwater Contaminant Target Level
PERFORMANCE RESULTS
The pilot event had successful results as demonstrated by a well in the former tank pit (MW-34) showing complete destruction of contaminants of concern. The down gradient well (MW-10) showed some temporary rebound for benzene and MTBE, which is a function of subsurface disturbance, but levels returned to below the GCTLs. Sampling was stopped due to scoring changes in the Florida Pre-Approval Program, however once the site was reopened, further site assessment and sampling have shown contaminant levels below GCTLs. The site was recommended for No Further Action Status and received an SRCO.
