Phase 1 & 2 Environmental Site Assessment

Phase 1 & 2 Environmental Site Assessment

Industrial Property, Chonburi, Thailand

SLP Environmental was appointed by a global manufacturing client to conduct and report a combined Phase 1 and Phase 2 Environmental Site Assessment (ESA) ESA in accordance with practice presented in ASTM E1527-13 and E1903-11 respectively. The primary objectives of the combined study was to i) determine the contamination status of soil and groundwater at the property as part of the transaction due diligence process and, ii) comply with Article 4 of the ‘Management of Soil and Groundwater Contamination Control within the Factory Area‘ Regulation (2016).

The Phase I ESA assessment comprised of a site and environs reconnaissance, interviews with key informants, consultations with the property owners and neighboring land users. Desk studies were also undertaken to determine the land use history of the area and the physical and natural environmental setting. This enabled the development of a preliminary conceptual site model (CSM) for the property and a determination as to whether any Recognised Environmental Conditions (REC) were associated with the subject property.

The Phase 2 ESA comprised of an intrusive site investigation that targeted the likely release areas identified during the Phase 1 ESA. The scope of works included the rotary boring of five exploratory holes, excavation of three trial trenches and the recovery of soil samples from each exploratory position. Temporary groundwater monitoring wells were installed in the soil bores and groundwater samples were also recovered. The recovered samples were submitted to an ISO:17025 accredited laboratory for analysis for a range of potential contaminants of concern (PCOC).

A wellhead position and elevation survey was undertaken to determine the hydraulic gradient in the shallow aquifer and strict QA/QC procedures were followed throughout the study. The laboratory test results were compared against Thai DIW Soil and Groundwater Quality Standards and US EPA Tier 1 Screening Values to determine the contamination status of the property. The final combined Phase 1/2 report was prepared in a template that complied with both Thai regulatory reporting requirements and the framework presented in ASTM practice. The report was prepared in the Thai and English languages.