comprehensive site investigation and remediation objectives report

4.0 DOCUMENTATION OF FIELD ACTIVITIES
Field activities for V3 site investigations are discussed in the following report sections. Although
V3 does not warrant the interpretations, evaluations or discussions provided in previous reports
performed by others, the data from these investigations was used to guide our Site
investigations. Additionally, the results of investigations conducted by others were used to help
characterize identified RECs. Documentation for reports prepared by others is provided in
Appendix A.
V3 conducted subsurface investigations at the Site from January 2008 to May 2009. The
investigative activities consisted of the collection of soil samples from 40 locations on four
separate occasions using Geoprobe® soil sampling methods, and the collection of groundwater
samples from six permanent and eleven temporary monitoring wells following ASTM methods.
Details related to these sampling efforts are provided in the following sections, and a summary
of samples and sampling analysis is provided on Tables 1.1.
The locations of soil borings and monitoring wells are shown on Figure 3.1. Photographs of
sampling locations and activities are provided in Appendix D. Appendix F details V3’s
standard operating procedures (SOPs).
4.1 SOIL SAMPLING
Direct push soil sampling provides data on the presence, nature and extent of soil
contamination, and information on subsurface geology. A total of 38 soil samples were
collected for chemical analysis from 40 boring locations (Figure 3.2). As stated in Section 3.5,
continuous soil samples were collected from the borings using a hand auger or 1.5-inchdiameter,
48 or 60-inch-long macro core sampler equipped with a plastic sample retainer from
which geologic logs were prepared (Appendix C). Soil samples were screened for VOCs using
the field headspace technique, as described in Section 3.5.
Soil samples were collected from the identified REC areas, as indicated on Figure 3.1, and
discussed below. One soil sample (SM-GP-14) was collected outside the Remediation Site to
address the distant northeast gas station. The northeast gas station is no longer considered a
REC due to the distance from the Remediation Site boundary, groundwater flow direction to the
southeast and analytical results in SM-GP-14. Analytical results from this boring were not used
as part of the Site characterization.
A summary of sample depths and analyses are listed in Table 1.1.
4.2 GROUNDWATER / MONITORING WELL SAMPLING
Six permanent monitoring wells (MW-10, SM-GP-110, SM-MW-01, SM-MW-02, SM-MW-03 and
SM-MW-04) and eleven temporary groundwater monitoring wells (SM-GP-07, SM-GP-08, SM-
GP-13, SM-GP-15 through SM-GP-18, SM-GP-105, SM-GP-106, SM-GP-108 and SM-GP-117)
were sampled on Site by V3, to assess the potential extent of impacted groundwater and to
obtain representative water levels. The samples were collected with a bailer or by a peristaltic
pump as discussed in Section 3.7. Well MW-09, a permanent monitoring well installed by ERS
to address impacts from the east adjacent gas station, is not located within the Remediation Site
boundaries and was not sampled by V3. See Figure 3.2 for well locations.
Comprehensive Site Investigation Report V3 Companies, 19
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