HomeMy WebLinkAboutApplication Files_93681_pg0010 1W.Jeff Folger-Town of South Windsor March 5,2008 '
Dzen Tree Farm Subdivision-Remedial Action Plan Page 2 of 3
`contaminated' samples by using AutoCAD, a computer drafting program.
p g p gram. If needed, property
lines also served as horizontal boundaries. The remediation target areas comprise approximately
18.9.acres of the site and are shown in Figure 1:
Remediation Action Plan
In March 1999, the CTDEP issued guidance on the development of former agricultural
properties. This guidance includes methods to remediate pesticide contaminated soil, such as
mixing the soil with unaffected soil,burying the contaminated soil below impervious covers such
as paved roads and parking lots,and removal and off-site disposal.
To address pesticide contaminated soil within the site remediation target areas, various cleanup
methods will be utilized within each development phase. There are four development phases
proposed for Dzen Tree Farm, and each will be completed in numeric sequence with Phase I
- completed first,then Phase 11,etc. It is estimated that development from Phase I through Phase
IV will take approximately five years'to complete. The proposed development phases with the
respective lots to be developed are depicted in Figure 1. .
The proposed remedial actions for target areas within each development phase will be as follows:
Phase I—Since there are no pesticide contaminated'soils within Phase I, no remedial action is
required for these lots.
Phase II_—Some or all of the soil within lots 31,32,33, 35, 36,and 37 include contaminated soil
to approximately eight inches deep. For those areas, the top 1.5 feet of soil will be
thoroughly mixed together and then resampled and tested for pesticides and arsenic. If
-contaminant concentrations remain elevated, either additional `clean' soil will be
mixed into the affected soil, or the affected soil will be placed below six inches of
`clean'topsoil. The cleanup may take up to three months to complete.
Phase III—Some or all of the soil within lots 44,45,46,and 50 and the open space area south of
lot 45 include contaminated soil to approximately eight inches deep. For those areas,
the top 1.5 feet of soil will be thoroughly mixed together and then resampled and
j analyzed for pesticides and arsenic. If contaminant concentrations remain elevated,
either additional `clean' soil will be nixed into the affected soil, or the affected soil
will be placed below six inches of`clean'topsoil.
Additionally, soil on lots 48 and 49 include contaminated soil to approximately 1.5
feet deep. For these two lots, approximately 1.5 feet of soil will be removed and
placed into a stockpile, thoroughly mixed with cow manure (making approximately
5% of total volume), and covered with plastic sheeting. Treated in this way, the
concentrations of pesticides in the soil pile should be reduced by anaerobic
dehalogenation processes. After approximately four to six months of-treatment, soil
samples will be collected and analyzed for target pesticides and arsenic. If
contaminant concentrations remain elevated, either additional `clean' soil will be
Remedial Action Plan 030308