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NE Park Update: Parcel D TPH Cleanup is Complete

30 Jun

During May-June 2014, a remediation crew from V3 Companies performed dig/haul of petroleum-impacted soil on Parcel D within the NE Park site .  The objective of the work was to remove soil impacted with levels of total petroleum hydrocarbons (TPH) that exceed site-specific Illinois EPA cleanup standards. Summary of findings of fieldwork below and can also be accessed online.

Excavation in Action!

Soil Remediation Activities

The cleanup work was performed in accordance with the IEPA-approved Remedial Action Plan (RAP) consisted of the excavation and haul-off of approximately 300 tons of TPH-impacted soils, and landfill disposal of these soils as a non-hazardous certified special waste.

After the impacted soils were removed, V3 collected soil verification samples from the excavation sidewalls and bottom. Soil analytical results for the verification samples were well below the site-specific soil TPH cleanup objective. No further soil remediation is required to address the issue.

Exploration for the Suspected Storm Sewer

While the cleanup excavation was open, V3 also explored the area where an suspected concrete storm sewer was previously observed in a soil boring. The excavator encountered concrete debris and a concrete floor slab at a depth of approximately 10 feet below grade, where water was observed flowing from beneath the slab. Remnants of the original soil boring were also encountered in this area. After further digging, no actual storm drain or sewer was found. It is evident that the concrete slab and groundwater found in the excavation were the features observed in the previous soil boring.  Thus, there is no evidence of a storm sewer in this area. The materials were actually a piece of the former building foundation from when the site was a brickyard long ago. No further work is required to address this matter.

Excavation Backfill

Parcel D TPH Cleanup - backfilled-looking south 060514

The remediation excavation was subsequently backfilled with the stockpiled overburden soils and clean soil that was imported to the site.  The area was rough-graded smooth to match the surrounding ground surface.

GW Monitoring Well Installation

One permanent groundwater monitoring well was installed down-gradient from the TPH cleanup area.  No obvious evidence of TPH impacts was observed in the well boring soil samples, and no visual evidence of petroleum product or impacts was observed in the groundwater samples.   Soil samples were collected for laboratory analysis of BTEX, PAHs and TPH.  Groundwater samples were analyzed for BTEX and PAHs.Post Remediation Activities

Soil analytical results were reported to be non-detect for BTEX and well below the site-specific TPH soil cleanup objective.  Groundwater analytical results were reported to be non-detect for BTEX and PAHs. No further action is required with respect to groundwater down-gradient from the cleanup area.

The cleanup activities and results will be documented in the forthcoming Interim Remedial Action Completion Report (RACR), which will be submitted to the Illinois EPA Site Remediation Program for review in the 1st week of July.

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Parcel D TPH-Clean Excavation Completed 05/30/2014

5 Jun

Dig-Haul Completedphoto 3_ParcelD-TPH-Cleanup_5.30.14

If anyone noticed, V3’s remediation crew was on-site last Friday, 05/30 digging TPH-impacted soil at 7:00 in the morning. Our consultants informed that the long-awaited removal and disposal went very well. The cleanup went pretty fast, still Aaron Carpenter, our Brownfields Coordinator was able to capture a few good shots of the work-in-progress. 
About 300 tons of total volume of soil was removed and visually, the dig looked good. V3 collected the verification samples and sent them to lab for expedited analysis. Results of the verification samples came in on 06/04/14……. And data results are below the Total Petroleum Hydrocarbon (TPH) goal. RW Collins will backfill the excavated area with clean fill material, today 06/05/14.
V3 will provide a written summary of their findings sometime next week, so we’ll provide more information as it becomes available.

Next Steps

V3 is waiting on the driller to schedule the installation of the monitoring well, likely for the week of 06/09/14.
V3 has already started the draft Remedial Action Cleanup Report (RACR) to document the final results. The draft will be completed before the end of June. We anticipate that the report will be submitted to IEPA for approval before mid-July. The City has plans to develop this property into future green openspace and naturalized stormwater management area.

NE Park Cleanup: April 2014 Updates

9 May

Parcel D TPH-Cleanup

  • Schedule Update: V3 has confirmed that the remediation is rescheduled for 05/30/14  05/16/14 has been pushed to the week of May 19, due to the heavy rain. Unfortunately, the ground has become too soaked to do the dig during the past couple of weeks.
  • Early in April, field crew from V3 Co. began mobilization activities to prepare the site for excavation. V3 already marked-up the area and was confirmed by the subcontractor. The proposed remediation area measures approximately 30’ by 30’ with the approximate depth interval of 10’-15’ below the ground surface.
  • In response to the RFP/Q for Remediation Subcontractor, our consultant received proposals from 4 different environmental companies. RW Collins has been selected for the TPH-Cleanup work. They are a WBE-certified business (…..USEPA grant agreement requires the City to make good faith efforts to meet fair share goals and contract with disadvantaged, women-owned & minority-owned businesses when possible. WBE goal is 12%) and their cost estimate for work was considerably low.
  • Have questions related to this cleanup? Concerned about risks to public health?

Site-wide Cleanup Planning

In response to IEPA comments on ROR/RAP, Weaver Boos, City’s environmental consultant has finished the draft of Supplemental Remedial Investigations Workplan. After a review with the staff, the plan is anticipated to be submitted to IEPA in mid-May. It is a comprehensive document that includes all the parcels within the NE Park site and would help the City further remediation/construction efforts.