Finding of no significant impact proposed corrective action for the Northeast Site at the Pinellas Plant in Largo, Florida Page: 4 of 89
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the plant, and the closest residential area is approximately 0.3 miles from the plant. The
Northeast Site is entirely within the boundaries of the Pinellas Plant and access to and use of
the site is therefore strictly controlled.
The Northeast Site contains approximately 20 acres in the northeast comer of the Pinellas
Plant and includes the East Pond. Numerous investigations of the Northeast Site, including a
RCRA facility investigation in 1991, confirmed that groundwater in the surficial aquifer at the
site is contaminated with volatile and semivolatile organic compounds. The surficial aquifer is
very close to the surface and approximately 32 feet thick at the Pinellas Plant. No municipal
water supplies are taken from the surficial aquifer due to the limited availability and naturally
poor quality of the groundwater in the aquifer. The contaminated groundwater plume has
remained within the boundaries of the Northeast Site.
In 1992, an interim corrective measure was implemented for the Northeast Site, primarily in
response to the concern that the contaminant plume was potentially increasing in areal extent
and could migrate offsite. The interim corrective measure consists of withdrawing
contaminated groundwater from the surficial aquifer through recovery wells at the Northeast
Site and treating the groundwater in the existing water treatment facility for the 4.5-Acre Site in
the northeast comer of the Pinellas Plant This water treatment facility uses an air stripper to
remove volatile and semivolatile organic compounds from contaminated groundwater. The
effluent from the treatment facility is discharged into the Pinellas County Sewer System.
PROPOSED ACTION: The proposed corrective action for the Northeast Site is pump-and-
treat with air stripping. Groundwater recovery wells would be completed in the surficial aquifer
to withdraw contaminated groundwater from the aquifer. The recovered groundwater would be
piped to a groundwater treatment system that would be constructed at the Northeast Site and
3
PINELLASWIFO.3.WP12?2a194
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Finding of no significant impact proposed corrective action for the Northeast Site at the Pinellas Plant in Largo, Florida, report, June 1, 1995; United States. (https://digital.library.unt.edu/ark:/67531/metadc708849/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.