comprehensive site investigation and remediation objectives report

5.0 ENDANGERMENT ASSESSMENT
The Site Investigation targeted the investigation of the identified RECs:
• REC 1 – Former Dry Cleaning Operations (areas of concern include former cleaning
areas, mechanical areas and possible areas of chemical storage),
• REC 2 – Hydraulic Lifts (areas of concern include the locations of three hydraulic lifts
located on the south side of the building), and
• REC 3 – East Adjacent Gas Station (areas of concern include the northeastern portion
of the Site where PNAs have been previously identified in soil and groundwater).
The following sections summarize conditions associated with Site RECs and the general
findings of the Site Investigation.
5.1 CONTAMINANTS OF CONCERN (COCS)
The primary COCs identified through laboratory analysis, the exposure pathways of concern
(see Table 1.1 for summary), and the apparent source of COCs are discussed briefly below. A
detailed TACO Tier 1 analysis is provided in Section 6.3.
• Metals
‣ Four metals (aluminum, iron, lead and manganese) have been identified in
groundwater in excess of Tier 1 RO at two wells. However, it is not apparent that the
encountered concentrations represent a notable groundwater concern, and may be
the result of relatively high suspended solids within collected samples.
‣ The exposure pathway of concern for metals is only the direct groundwater ingestion
route.
• VOCs
‣ VOCs were identified in excess of Tier 1 ROs in multiple soil samples and monitoring
wells. Identified PCE concentrations and its daughter products are due to former dry
cleaning operations. Chloroform is also identified as a historical dry cleaning solvent.
However, the presence of chloroform, bromodichloromethane, and bromoform could
be the result of disinfection byproducts of drinking water or laboratory standard
reagents for analysis, unrelated to the Site. BTEX was not identified in the laboratory
analysis above Tier 1 ROs; only one low detection of toluene was noted.
‣ The exposure pathway of concern is soil ingestion, inhalation, soil component of the
groundwater ingestion route and direct groundwater ingestion.
Pesticides and PCBs were eliminated as Site COCs based on a review of historic environmental
assessments, Site operations and available investigation data, which indicate no evidence of
these constituents above Tier 1 ROs. Pesticides were also eliminated from consideration based
on historical data that did not indicate evidence of their release or illegal disposal at the Site.
PNAs were eliminated in soil because there were no detections above Tier 1 ROs. PNAs in
groundwater from historic well (MW-10) were identified in 2006, but V3 re-sampled the well in
Comprehensive Site Investigation Report V3 Companies, 22
Spartans’ Square Shopping Center May 2010