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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<strong>Remedial</strong> <strong>Action</strong> <strong>Completion</strong> <strong>Report</strong><br />
June 2008<br />
3.4.1 Designation of Work Zones Boundaries<br />
Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4)<br />
Page 3-12<br />
Prior to initiating excavation activities, Shaw established <strong>the</strong> work zone boundaries by <strong>the</strong><br />
placement of barrier fences and <strong>the</strong> appropriate signage. The work zones were living boundaries<br />
and <strong>the</strong> size and configuration of <strong>the</strong>se work zones increased or decreased based upon conditions<br />
encountered in <strong>the</strong> field.<br />
3.4.2 Soil Excavation at all Load Lines<br />
Excavation of <strong>the</strong> contaminated soils and dry sediments typically proceeded in <strong>the</strong> following<br />
sequence and methodology:<br />
1. The corners of <strong>the</strong> excavation design limits identified in <strong>the</strong> RAWP (Shaw 2007b) load<br />
line excavation drawings were surveyed utilizing a Trimble GeoXHTM 2005 Series<br />
Handheld Global Positioning System (GPS) with an accuracy determination capable of<br />
within one foot and staked.<br />
2. Initially, an approximate 20-foot by 20-foot area was excavated from <strong>the</strong> area of highest<br />
COC concentration and moved outward from <strong>the</strong> assumed source location.<br />
3. After reaching <strong>the</strong> design limit of contamination or removal of “hot spot” areas, field test<br />
kits and/or screening equipment <strong>for</strong> <strong>the</strong> applicable COCs were implemented as an initial<br />
check to determine whe<strong>the</strong>r all contaminated soils were removed. Collection and<br />
analysis of field screen samples is discussed in Section 3.5.<br />
4. If <strong>the</strong> field test result(s) indicated that contaminated soils still remained, excavation at<br />
that location continued until <strong>the</strong> field test result(s) specified that contaminated soils had<br />
been removed to below <strong>the</strong> cleanup goals.<br />
5. Once <strong>the</strong> field test results identified that <strong>the</strong> contaminated soils had been removed,<br />
multi-increment samples were collected from <strong>the</strong> completed excavations <strong>for</strong> off-site<br />
processing and confirmatory laboratory analysis to verify that contaminated soil above<br />
<strong>the</strong> clean-up criteria was removed in accordance with cleanup goals. Multi-increment<br />
confirmatory sample process and analysis is discussed in Section 3.6.<br />
6. Excavated material was stored temporarily on-site at designated stockpile locations at<br />
each load line. The soils were placed accordingly in stockpiles based on <strong>the</strong> COCs within<br />
<strong>the</strong> excavation. At <strong>the</strong> end of each workday <strong>the</strong> stockpiles were covered and secured<br />
prior to leaving <strong>the</strong> site.<br />
7. Once received from <strong>the</strong> laboratory, confirmatory analytical results were reviewed by <strong>the</strong><br />
Shaw Project Chemist and submitted to <strong>the</strong> USACE and Ohio EPA project managers <strong>for</strong><br />
approval prior to backfilling <strong>the</strong> excavations. A discussion of <strong>the</strong> analytical results <strong>for</strong><br />
<strong>the</strong> multi-increment samples is presented in Section 3.6.<br />
8. Once approval to backfill was given, Shaw collected an as-built survey of <strong>the</strong> excavation<br />
area using <strong>the</strong> a<strong>for</strong>ementioned GPS in Step 1. The excavation was <strong>the</strong>n backfilled with<br />
clean fill from an approved off-site source. Site restoration activities following backfill<br />
of <strong>the</strong> excavations are discussed in Section 3.8.<br />
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