Leaking Underground Storage Tank Site
EXPRESS LANE #2

Environmental Resources Group, LLC (ERG) provided environmental consulting services for Express Lane #2 to obtain the closure of a Part 213 leaking underground storage tank (LUST) site (Facility # 00003369) in Grand Haven, Michigan. The services provided by ERG include UST assessment sampling, initial response activities, initial and final assessment investigation and reporting, risk based corrective action determination, feasibility analysis, and corrective action activities.

ERG completed four soil borings in March 2017 as part of a pre-assessment investigation at the site to determine if contamination was present in the subsurface that may affect the proper removal of the UST system. The laboratory analytical results for the samples indicated the presence of petroleum related hydrocarbons in one of the groundwater samples collected. These laboratory results were received by ERG on March 13, 2017, and the subsequent release report was submitted to LARA on March 14, 2017.

Before the decommissioning, removal, and closure of the four USTs on site, ERG performed a dual phase extraction event in an effort to reduce contaminant levels within the soils and groundwater. A total of 600 gallons of petroleum contact water were vacuumed out of a temporary PVC well on-site in April 2017. In addition, a separate remediation firm, under a separate contract with the property owners, installed a dewatering and treatment system in June 2017, to properly remove the existing USTs and install new USTs. Throughout this process, 3,910,500 gallons of treated groundwater were discharged, and 297.91 tons of impacted soil were collected and properly disposed of during the UST removal in July 2017.

In September 2017, ERG conducted a total of 14 soil borings, 10 monitoring wells, and three soil gas vapor points at the property as part of the initial assessment activities. The laboratory analysis results for the soil samples indicated the presence of petroleum related hydrocarbons in one of the 13 soil samples. With the analytical results of the soil samples, the extent of soil impact was defined on the site. Furthermore, the 10 monitoring wells were sampled in September and November 2017 and February 2018. Based on the sampling events, the groundwater plume was defined on-site both vertically and horizontally. Lastly, the three soil gas vapor points were sampled in November 2017 and February 2018 as a part of the initial and final assessment activities and none of the detected values exceed vapor screening levels.

After conducting a thorough risk assessment after the initial and final assessment activities, ERG concluded that active remedial activities were not necessary for the corrective action plan (CAP). Rather, ERG proposed that groundwater monitoring wells and vapor monitoring points be sampled in additional quarterly sampling events to ensure the plume was stable and the vapor intrusion pathway could be eliminated.

In February 2020, ERG completed a closure report utilizing a restrictive covenant on a section of the property where the soil and groundwater impact was located. On May 12, 2021, EGLE submitted a “Notice of Closure Report Considered Approved” acknowledging the closure of the site. ERG will abandon the monitoring well and vapor points in June 2021 as required by EGLE.

 SERVICES PROVIDED

Underground Storage Tanks
Dual Phase Extraction Event
Soil and Groundwater Investigation
Vapor Intrusion Pathway Analysis
Closure