EP 1110-1-19
30 Jun 01
Exhibit 4-5, cont.
Example Chronology of Events (Section 4)
Date
Event
January 20, 1997
Semiannual groundwater monitoring initiated .
June 12, 1997
Preliminary Close Out Report for site signed for site construction completion.
September 15, 1997
Second lift of soil applied to treatment subplots.
March 14, 1998
Third lift of soil applied to treatment subplots.
Final sampling of soil in treatment subplots and in other designated site areas
June 28, 1998
conducted.
July 24, 1998
Final soil sampling results validated; remediation objectives achieved.
September 1, 1998
Land treatment area demobilized and re-vegetated.
PRPs, EPA, and the State conduct pre-certification inspection of the completed
September 22, 1998
remedial action.
Ongoing
Semiannual groundwater monitoring. Expected to continue through 2002.
4-6.
Performance Standards and Construction Quality Control.
a.
This section should describe the overall performance of the remedial technology
in terms of a comparison to cleanup goals/remediation objectives. For treatment remedies, this
section should identify the quantity of material treated, the strategy used for collecting and
analyzing samples, and the overall results from the sampling and analysis effort. An explanation
of the approved construction quality assurance (QA) and quality control (QC) requirements, or
citations for the appropriate references, should be provided. An explanation of any substantial
problems or deviations should be included.1 An assessment of the performance data quality and
of the overall analytical data quality should be provided, including a brief discussion of the
QA/QC procedures followed, the quality assurance project plan (QAPP) used, and the data
quality objectives (DQOs) to which the analytical data were compared. For PRP-lead projects, a
discussion should be provided of EPA's oversight activities and results with regard to analytical
data quality. An example section is provided in Exhibit 4-6.
b.
Specific topics to consider for this section include sample frequency and protocol,
concentrations of untreated vs. treated contaminants, comparison with cleanup goals, methods of
analysis, and treatment residues. More detailed information on documenting technology
performance is provided in Chapter 5 of this guide (Paragraph 5-1).
1
Note that changes to the remedy selected in the ROD that occurred during the RD/RA process must be described in an
Explanation of Significant Differences (ESD) or a ROD Amendment pursuant to NCP 300.435(c)(2) and 300.825(a) that is
provided separately from the RA report.
4-8
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