& Recommendations for the Remediation of Historic Pesticide Contamination
- Final Report March 1999
Investigation Sampling Methods
The following sampling methods were developed by the New Jersey Department
of Environmental Protection and should be used state-wide so that consistent
and reliable data are generated. Site investigation sampling methods are
to be used to investigate current or former farm fields and orchards and
should not be used to evaluate other potential areas of concern which may
be present, such as chemical storage and mixing areas, underground storage
tanks and waste disposal areas. The goal of site investigation sampling
is to determine if contamination is present at levels exceeding the Departmentís
soil cleanup criteria.
If contamination is detected, additional remedial investigation
sampling may be necessary to determine the vertical and horizontal distribution
of the contamination which is needed to develop a specific remediation
plan. The Department should be contacted to oversee additional sampling
and remedial action.
Sampling should be conducted pursuant to the Departmentís
Sampling Procedures Manual and analysis conducted by certified
laboratories pursuant to the Technical
Requirements for Site Remediation, N.J.A.C. 7:26E-2.
Site Investigation Sampling
Sample location and depth:
Discrete samples should be taken at a depth of 0-6" within farm
fields. If extent of former fields cannot be determined, the entire property
should be sampled.
Sampling frequency is dependent on the size of the site:
Sites<1-10 acres, 1 sample for every 2 acres with
a minimum of 2 samples; then sites>10 acres add 1 sample for every
5 acres. A reduced sampling frequency may be appropriate for very large
All samples should be analyzed for arsenic, lead and a pesticide scan
(SW 846-8081A). The pesticide scan includes a total of 20 compounds including
DDT, DDD, DDE, dieldrin and chlordane (see pesticide analyte list in Addendum
2). All analytical results obtained from the pesticide
analysis should be provided to the reviewing agency.