SD Enviro Ltd.
Environmental Chemistry Simplified
Sarah Dougherty, M.A.Sc., P.Chem.
Registered with the Association of the Chemical Profession of Alberta
Contaminated Sites Assessments
- Environmental Chemical Forensics
- Soil, Soil Gas, Groundwater, and Surface Water Sampling Programs
- Soils: test pitting, coring (sonic), direct push sampling
- Soil Gas: sampling with Summa canisters or thermal desorption tubes; sampling from probes or monitoring wells
- Groundwater: sampling with bailers, Waterra tubing, low flow with peristaltic pumps
- Surface Water: sampling with bailers or pond samplers
- Analytical Results Interpretation and Data Quality Assessment, including statistical assessments (e.g., Mann-Kendall, Wilcoxon, Student’s t-tests)
- Phase 2 ESAs
- Contaminant Fate and Transport Assessment
- Report Review and Professional Sign-off for Phase 1 ESAs, Phase 2 ESAs, remediation reports, and EPEA Approval Monitoring reports (Groundwater, Soil, Soil Vapour)
- Sites previously assessed include: Municipal Landfills, Natural Gas Processing Plants (Sour and Sweet), Natural Gas and Oil Well Sites, Dry Cleaners, Gas Stations, Creosote Sites, Rail Spill Sites
Risk-Based Guideline Selections
- Alberta Tier 1 and Tier 2 Soil and Groundwater Remediation Guidelines
- Conceptual Site Model Development
- Pathway Exclusion
- Alberta Tier 2 Guideline Modifications using Site-Specific Data
- CCME and Health Canada Guidelines
Remediation
- Monitored Natural Attenuation (MNA)
- Natural Source Zone Depletion (NSZD)
- Excavation and Soil Management
- Subsoil Salinity Tool Certified
- In Situ Chemical Oxidation (ISCO)
- Water Treatment
Jurisdictions
- Alberta – Registered Professional
- Federal Canada – Registered Professional (CCME Guidelines, Health Canada Drinking Water Guidelines, via Alberta registration)
- Saskatchewan – Experience with provincial requirements (professional registration possible if required)
Contaminants of Concern
- Petroleum Hydrocarbons (PHCs), including light non-aqueous phase liquids (LNAPL)
- Salt-contaminated soils and groundwater (chloride, sodium, sodium adsorption ratio, sulphate)
- Sulphur-contaminated soils
- Volatile organic compounds (VOCs)
- Nitrates and nitrites, nitrogen-based compounds
- Metals
- Polycyclic aromatic hydrocarbons (PAHs)
- Glycols
- Alcohols (methanol, in particular)
- Amines