Client's Issue and Needs
An industrial sandblasting facility located within the Foothills Industrial Business Park in Calgary, Alberta, had operated at this location since 1979. An attempt to sell the site by the owners resulted in a Phase I ESA request from the lending institution to satisfy the lenders internal risk department prior to releasing any funds to the potential purchaser.
The Phase I ESA identified various on-site and off-site areas of potential environmental concern, which resulted in various Phase II/III ESA investigations.
At the time of these assessments, the site continued to operate as a sandblasting facility. All on-site environmental investigation activities were coordinated with on-site personnel to ensure that disruptions to their day to day operations were kept to a minimum.
Our Services and Solutions
PHH ARC completed initial Phase I ESA and Phase II ESA investigations that identified localized petroleum hydrocarbon (PHC) impacts in soil related to fuel and waste oil aboveground storage tanks (ASTs). Remedial activities were completed to remove and properly dispose of these PHC soil impacts.
Initial investigation activities also identified localized PHC impacts to groundwater, possibly related to off-site activities at an adjacent auto wrecking yard. PHH ARC conducted a secondary Phase II ESA investigation to gather additional information for modifying the applicable Alberta Environment Tier 1 and 2 Soil and Groundwater Remediation Guidelines (2009) and eliminating the Domestic Use Aquifer (DUA) exposure pathway. Following elimination of the DUA exposure pathway, PHC concentrations in groundwater no longer exceeded the applicable criteria.
Phase II ESA activities also identified metal impacts in surficial soil across the majority of the site related to historical sandblasting and painting activities conducted on the site exterior. PHH ARC conducted an extensive Phase II ESA delineation investigation that involved drilling approximately 100 shallow boreholes across the entire site following a 10 m x 10 m grid and collecting soil samples at various depths to determine the vertical and horizontal extent of the metal impacts. Following completion of the delineation investigation, PHH ARC developed and implemented a RAP that involved approximately five weeks of on-site time overseeing the excavation of surficial soil impacted with metals across the majority of the site to depths ranging from 0.5 m to 1.0 m below ground surface (bgs). Field screening activities involved using a mobile X-Ray Fluorescence (XRF) device to determine approximate concentrations of metals on-site prior to laboratory submission and to aid in the determination of the final extents of the excavation.
Following completion of all investigation activities, formal reports were prepared and submitted to the client detailing the findings of the investigation and providing recommendations to aid in the prevention of future impacts on-site.
PHH ARC was responsible for coordinating all field activities to ensure work was completed in a timely and cost effective manner, while upholding the quality of the work completed.
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