Phase II Site Investigations

If findings of a Phase I ESA indicate the likely existence of a REC, HREC, CREC or VEC, a Phase II ESA investigation may be warranted. The purpose of a Phase II ESA is to establish if a release of hazardous substances has occurred and are present on site and to identify actual and potential contaminant sources. GGI follows the ASTM Standard Practice (E1903-11) for all Phase II investigations and assessments. Key components of a Phase II ESA are:

• Statement of one or more objectives, including a testable hypothesis or multiple working hypotheses;

• Identification of the area and scope of investigation;

• Development of a Conceptual Site Model (CSM);

• Development of a Sampling and Analysis Plan (SAP);

• Development of a HASP and QAPP;

• Field campaign and testing (field, laboratory, or both);

• Validation of the CSM

Selected Projects:

Phase I and Phase II Environmental Site Investigation, UST Investigation and Removal, Risk Based Site Closure, Santa Fe County Yard, Santa Fe, New Mexico

GGI conducted a Phase 1 ESA at the former Santa Fe County Yard in Santa Fe, NM that recommended a Phase II ESA. As part of the Phase II, GGI designed several field investigations over a 10-year period to identify and characterize multiple contaminant sources. The County had several USTs and ASTs, each with multiple releases over at least a 20-year period. GGI provided drilling and excavation oversight and conducted multiple drilling investigations to identify specific contaminant sources (dominantly gasoline and diesel) and supervised excavation and land farming of approximately 80 yards of diesel and gasoline contaminated soils, achieving remediation goals.

Details of Work Performed:
To determine plume extent, GGI designed and conducted field investigations that included installation and sampling of soil borings, monitoring wells, vapor screening for SSAs, collection and analysis of soil, soil vapor, sediment, water, and air samples to determine nature and extent of contamination in conjunction with Underground Tank Storage Bureau. GGI developed individualized QAPPs and HASPs for each stage of drilling and excavation. GGI conducted these investigations over >10 years and provided each work product within project budgets for each stage of investigation.

Phase II Site Assessment and Remediation: Burger King Texaco, Santa Fe, New Mexico

GGI conducted a Stage 1 and Stage 2 leaking UST investigation at the Burger King Texaco adjacent to the Santa Fe River. GGI developed a Conceptual Site Model to assess the degree of interconnection between shallow gasoline-contaminated groundwater and the Santa Fe River. GGI designed drilling and testing investigations to assess the horizontal and vertical extent of gasoline contamination in soils and groundwater on the north side of the Santa Fe River. To keep the businesses operating during normal working hours, GGI conducted drilling activities from 10:00 p.m. to 7:00 a.m. GGI assessed the interconnectedness of the shallow gasoline contaminated aquifer with the Santa Fe River over a 5 year period. GGI identified the horizontal and vertical extent of soil contamination and excavated approximately 600 yds3 of gasoline contaminated soils and that were successfully remediated at a land farm. GGI supervised installation of an air sparging/soil vapor venting system to remediate soils and groundwater and monitored system operation until site cleanup goals were achieved.

Details of Work Performed:
To determine plume extent, GGI designed and conducted field investigations that included installation and sampling of soil borings, monitoring wells, vapor screening for SSAs, installed pilot scale and operational air sparging/soil vapor venting remediation systems to remediate gasoline contamination adjacent to the Santa Fe River. GGI conducted these investigations over >5 years and provided each work product within project budgets for each stage of investigation.