Phase 2 Environmental Site Assessment (Phase 2 ESA)

Phase 2 Environmental Site Assessment (Phase 2 ESA)

Industrial Property, Rayong, Thailand

SLP Environmental was appointed to conduct and report a Phase 2 Environmental Site Assessment (geoenvironmental site investigation) at a former aero-engine precision components manufacturing facility located on the Eastern Seaboard of Thailand. The assessment was undertaken as part of the client pre-acquisition due diligence process and the primary objective of the study was to assess whether past activities at the subject property had resulted in the contamination of soil and or groundwater underlying the property.

The Phase 2 ESA was conducted in accordance with practice presented in ASTM E1903 -11: Standard Practice for Environmental Site Assessments: Phase II Environmental Site Assessment Process. SLP had been previously appointed by the client to prepare a Phase 1 ESA for the subject property which identified Recognised Environmental Conditions (RECs) associated with the property.

SLP developed the Statement of Objectives for client approval and subsequently designed an intrusive site investigation that targeted the likely release areas identified during the Phase 1 ESA. The scope of works included concrete coring followed by the rotary boring of several exploratory holes across the study site to depths ranging from 6-8m below ground level (bgl) and the recovery of soil samples for analysis at an ISO17025 accredited environmental testing laboratory.

Temporary groundwater monitoring wells were installed in three of the soil bores which were then developed and purged in accordance with good practice. In-situ field monitoring for parameters such as pH, EC, conductivity and dissolved oxygen was then undertaken prior to the groundwater samples being recovered using dedicated Teflon bailers. A wellhead position and elevation survey was then undertaken to determine the hydraulic gradient in the shallow aquifer. Strict QA/QC procedures were followed throughout the length of the study.

The laboratory test results were compared with Thai and US EPA Tier 1 Screening Values to determine the contamination status of the property. The Phase 2 ESA report provided a full record of the works with clear conclusions, recommendations and an updated environmental risk rating for the subject property.