Final Remedial Action Completion Report for the ... - Rvaap.org
Final Remedial Action Completion Report for the ... - Rvaap.org
Final Remedial Action Completion Report for the ... - Rvaap.org
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New Page<br />
or Sheet<br />
A-23 3-4 Pg 3-4 to<br />
3-7<br />
Comment<br />
Section 3.2.8. RVAAP ground<br />
water constituent concentrations<br />
are typically compared to<br />
USEPA Region 9 PRGs.<br />
Shaw Environmental, Inc. 18 of 39<br />
Recommendation<br />
Include a discussion of <strong>the</strong> relation<br />
of <strong>the</strong> detected compounds with <strong>the</strong><br />
USEPA Region 9 PRGs.<br />
Response<br />
Discussion regarding a comparison<br />
of <strong>the</strong> detected compounds to<br />
USEPA Region 9 PRGs will be<br />
included in Section 3.2.8. Shaw will<br />
submit this text <strong>for</strong> review prior to<br />
issuing <strong>the</strong> Draft report.<br />
3.2.8 Summary of Groundwater<br />
Sample Results<br />
The purpose of <strong>the</strong> initial<br />
groundwater sampling activities was<br />
to identify presence of contaminants<br />
in groundwater prior to initiation of<br />
Shaw construction activities.<br />
Baseline groundwater sampling was<br />
not intended to characterize <strong>the</strong><br />
extent of contamination at <strong>the</strong>se<br />
locations or attempt to ascertain a<br />
potential source. However, in order<br />
to establish <strong>the</strong> existing contaminant<br />
conditions in groundwater at LLs 1-<br />
4, where applicable, results were<br />
compared to <strong>the</strong> RVAAP Water<br />
Quality Criteria that are consistent<br />
with <strong>the</strong> United States<br />
Environmental Protection Agency<br />
(USEPA) Primary Drinking Water<br />
Regulations and <strong>the</strong>ir Maximum<br />
Contaminant Limits (MCLs) and<br />
Secondary Standards, <strong>the</strong> USEPA<br />
Region 9 Preliminary Remediation<br />
Goals (PRGs) and RVAAPestablished<br />
background levels<br />
established (in<strong>org</strong>anics only). It<br />
should be noted that not all <strong>org</strong>anic<br />
and in<strong>org</strong>anic compounds, analyzed<br />
as part of <strong>the</strong> baseline groundwater<br />
sampling event, have established