HQUST Remediation System Compound (groundwater pump-&-treat system); including oil/water separator, free product storage tank, granular activated carbon vessels, and air compressor.
This site status report, covering the period between June 2016 through May 2017, was submitted to the Arizona Department Environmental Quality.
This is the Industrial Wastewater Discharge Permit Self-monitoring Report Form submitted to Pima County for the discharge of treated water for this site.
Report summarizes a soil vapor extraction (SVE) pilot test conducted on August 23, 2012. The study concludes SVE would be successful at removing petroleum hydrocarbons at the source and accelerate environmental case closure.
Report summarizes the initial soil and groundwater well drilling to characterize the site.
Full Title: Summary and Evaluation of Site Investigation Activities for Feasibility of Pilot Test Using In-Situ Chemical Oxidation in Area of Concern 1. Report summarizes results of a pilot test the City conducted in the vicinity of the former fuel island. The report was submitted to the Arizona Department of Environmental Quality on September 12, 2011. Test confirms that residual gasoline contamination at this project could be remediated through the injections of chemical oxidizing mixture into selected wells. This remediation method was discussed and approved by ADEQ earlier this year. With submittal of this document to ADEQ, the City will proceed to schedule and run an injection pilot test of the oxidizing agent into wells in late September or early October 2011.
Letter from the Arizona Department of Environmental Quality (ADEQ) that grants approval of site characterization, states that a corrective action plan would not be required, but contaminant concentrations from the UST release would need to be cleaned-up to levels to or below applicable ADEQ cleanup standards.