What Our Clients Are Saying
Thank you for your assistance through this circus of errors, misinformation, lack of communication, and inefficiency. At times it seemed beyond redemption. Your project manager was magnificent, and we wish to emphasize that he had the only clear mind, the only steady hand, the only source of common sense in the whole battery of bureaus, departments, and businesses.
Otis Wilson
Port of Portland Leased Facility
Client
Project Type
Project Services
Project Description
Project management included design and installation of chemical oxidation (CO) and soil vapor extraction (SVE) systems to reduce soil and groundwater contaminants to concentrations below risk-based concentrations (RBCs) for applicable receptors and exposure pathways. The project is ongoing and has been implemented in two (2) phases. Phase I targeted remediation of gasoline-range total petroleum hydrocarbons (TPH) in soil and groundwater beneath, and adjacent to, the footprint of the on-site building. Remediation in this area was identified as a high priority given the documented and ongoing potential for vapor intrusion of gasoline vapors into the building. The second phase of the project (Phase II) targeted remediation of gasoline-range TPH in soil and groundwater downgradient, or west of the building.
The Risk-Based Corrective Action Plan (CAP) included completion of a conceptual site model (CSM). The CSM identified an occupational and excavation and construction worker receptor scenarios for the site and the following exposure pathways were deemed complete for both soil and groundwater including: vapor intrusion to indoor air and volatilization to outdoor air exposure pathways. TPH as gasoline and several gasoline constituents including benzene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, naphthalene, and total xylenes were identified as contaminants of concern (COC). Transition of ozone injection to Phase II wells began when dissolved groundwater contaminant concentrations in monitoring wells in the area of the building were below the generic occupational and excavation and construction worker RBCs for vapor intrusion to indoor air and volatilization to outdoor air exposure pathways.
