Final Remedial Action Completion Report for the ... - Rvaap.org

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Comment
Section 3.2.8. RVAAP ground
water constituent concentrations
are typically compared to
USEPA Region 9 PRGs.
Shaw Environmental, Inc. 18 of 39
Recommendation
Include a discussion of the relation
of the detected compounds with the
USEPA Region 9 PRGs.
Response
Discussion regarding a comparison
of the detected compounds to
USEPA Region 9 PRGs will be
included in Section 3.2.8. Shaw will
submit this text for review prior to
issuing the Draft report.
3.2.8 Summary of Groundwater
Sample Results
The purpose of the initial
groundwater sampling activities was
to identify presence of contaminants
in groundwater prior to initiation of
Shaw construction activities.
Baseline groundwater sampling was
not intended to characterize the
extent of contamination at these
locations or attempt to ascertain a
potential source. However, in order
to establish the existing contaminant
conditions in groundwater at LLs 1-
4, where applicable, results were
compared to the RVAAP Water
Quality Criteria that are consistent
with the United States
Environmental Protection Agency
(USEPA) Primary Drinking Water
Regulations and their Maximum
Contaminant Limits (MCLs) and
Secondary Standards, the USEPA
Region 9 Preliminary Remediation
Goals (PRGs) and RVAAPestablished
background levels
established (inorganics only). It
should be noted that not all organic
and inorganic compounds, analyzed
as part of the baseline groundwater
sampling event, have established