BTEX, MTBE, TBA and TPHg Remediation
Former Retail Gas Station in California
The origin of the contamination problem was from hydrocarbon fuel releases that occurred at a former service station located on the northeast quadrant of the intersection. The service station had been demolished, and some contaminated soil excavation completed. However, high concentrations of contaminants located in monitoring wells indicated that sources still remained in the initial release area. Additionally, similar high concentrations of contaminants in monitoring wells located southeast of the intersection indicated that contaminants were probably transported by the groundwater (flowing in a southerly direction). It was also concluded that the contaminant plume extended from these southerly monitoring points back north, under the road, to the initial source (the former service station). The goal was to treat around the highest contaminated well (MW-7) on the southeast corner of the intersection.
PROJECT AT A GLANCE
Type of Site: Former Service Station
Location: Southern California
Contaminants: BTEX, MTBE, TBA and TPHg
Work Scope: Inject Cool-Ox® Reagent
Media Treated: Soil & Groundwater
Soil Type: High desert, loamy sand
Groundwater Depth: 24 ft-bgs
Remedial Objectives (Phase 1): Reduce concentrations and close site
Application Method: DPT Probe Rig
Area Treated: 1,250 square Feet
Vertical Interval: 17 to 27 feet bgs
Injection Point (IP) Spacing: 7 ft.
Media Volume Treated: 463 cubic yards
Number of Injection Points: 27
Cool-Ox® Volume: 3,240 gallons
Cool-Ox® per IP: 120 gal
Site Closed! – The Los Angeles Regional Water Quality Control Board closed the site because it met the Low-Threat Underground Storage Take Case Closure Policy.