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June
2005 through October 2005
The Borello Property is located at Cochrane and
Peet Roads (APN 728-34-3) in Morgan Hill, Santa Clara
County, California. The property consists
of a 14-acre parcel previously contaminated with
elevated concentrations of Toxaphene and Dieldrin
within the surface soil from use as an apricot and
cherry orchard from the early 1900s. In September
2004, the orchard was burned on site to increase
carbon load in the soil. BioTech Restorations
performed a bench study on the soil from the site
and determined the soil used in the bench study was
successfully remediated using an effective Factor.
In June 2005, Factor, lime, manure and nitrogen fertilizer (ammonium nitrate)
were used to amend the initial 18-inches of soil on the property. Bi-weekly
irrigation followed by soil mixing at 10-day intervals for two months effectively
neutralized Toxaphene from an initial concentration of 6.2 parts per million
(ppm) to a final concentration of 0.13 ppm and an initial Dieldrin concentration
of 0.4 ppm to a final concentration of 0.017 ppm. Both of the final concentrations
were below residential cleanup levels of 0.4 ppm for Toxaphene and 0.025 ppm
for Dieldrin established in the DTSC approved Removal Action Workplan (RAW). The
Closure Letter dated October 7, 2005 for the Borello Property indicated unrestricted
use on the property.
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