Phase 2 Environmental Site Assessment (Phase 2 ESA)

Phase 2 Environmental Site Assessment (Phase 2 ESA)

Former Procter & Gamble Manufacturing Facility Samut Prakarn, Thailand

SLP Environmental was appointed to conduct and report a Phase 2 Environmental Site Assessment (geoenvironmental site investigation) at a former Proctor and Gamble  manufacturing facility located in Samut Prakarn, Thailand. The assessment was undertaken as part of the clients 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 peer review the vendors consultants Phase 1 and 2 ESA reports. Our review identified significant omissions in their scope of works prompting uncertainty with respect to the contamination status of the property and SLP was retained to conduct a supplementary targeted site investigation to reduce these uncertainties.

SLP Environmental developed the Statement of Objectives for client approval and subsequently designed an intrusive site investigation that targeted the likely release areas identified during the peer review. The scope of works included concrete coring followed by the rotary boring of three exploratory holes across the study site to depths ranging from 5-7m 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 the soil bores which were  developed and purged in accordance with good practice. In-situ field monitoring for parameters such as pH, EC and dissolved oxygen was followed by the collection of groundwater samples 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.