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Remedial Action Completion Report June 2008 3.4.1 Designation of Work Zones Boundaries Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4) Page 3-12 Prior to initiating excavation activities, Shaw established the work zone boundaries by the placement of barrier fences and the appropriate signage. The work zones were living boundaries and the size and configuration of these work zones increased or decreased based upon conditions encountered in the field. 3.4.2 Soil Excavation at all Load Lines Excavation of the contaminated soils and dry sediments typically proceeded in the following sequence and methodology: 1. The corners of the excavation design limits identified in the RAWP (Shaw 2007b) load line excavation drawings were surveyed utilizing a Trimble GeoXHTM 2005 Series Handheld Global Positioning System (GPS) with an accuracy determination capable of within one foot and staked. 2. Initially, an approximate 20-foot by 20-foot area was excavated from the area of highest COC concentration and moved outward from the assumed source location. 3. After reaching the design limit of contamination or removal of “hot spot” areas, field test kits and/or screening equipment for the applicable COCs were implemented as an initial check to determine whether all contaminated soils were removed. Collection and analysis of field screen samples is discussed in Section 3.5. 4. If the field test result(s) indicated that contaminated soils still remained, excavation at that location continued until the field test result(s) specified that contaminated soils had been removed to below the cleanup goals. 5. Once the field test results identified that the contaminated soils had been removed, multi-increment samples were collected from the completed excavations for off-site processing and confirmatory laboratory analysis to verify that contaminated soil above the clean-up criteria was removed in accordance with cleanup goals. Multi-increment confirmatory sample process and analysis is discussed in Section 3.6. 6. Excavated material was stored temporarily on-site at designated stockpile locations at each load line. The soils were placed accordingly in stockpiles based on the COCs within the excavation. At the end of each workday the stockpiles were covered and secured prior to leaving the site. 7. Once received from the laboratory, confirmatory analytical results were reviewed by the Shaw Project Chemist and submitted to the USACE and Ohio EPA project managers for approval prior to backfilling the excavations. A discussion of the analytical results for the multi-increment samples is presented in Section 3.6. 8. Once approval to backfill was given, Shaw collected an as-built survey of the excavation area using the aforementioned GPS in Step 1. The excavation was then backfilled with clean fill from an approved off-site source. Site restoration activities following backfill of the excavations are discussed in Section 3.8. *** FINAL***
Remedial Action Completion Report June 2008 3.4.3 MEC Oversight during Excavation Activities Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4) Page 3-13 As part of remediation activities at LLs 1-4, Shaw MEC personnel were assigned to observe the preparation of the work areas and soil excavation. The MEC personnel were responsible for inspecting excavated soils for the presence of propellants, identifying items suspected of being propellant nodules, and instructing Shaw field crew personnel as to how excavation activities would proceed so as to ensure the propellant material could be readily segregated for disposal. If MEC was encountered, direction of the excavation was to be guided by the MEC personnel until it was apparent that the MEC had been adequately removed. 3.5 FIELD SCREEN SAMPLING As discussed in Step 3 of Section 3.4.2, soil samples were collected upon reaching the design limit of contamination or removal of “hot spot” areas and were analyzed in the Shaw on-site field laboratory using test kits and/or screening equipment for the applicable COCs. The field screen results were used as a screening tool to assess its ability in guiding remediation. 3.5.1 Sample Collection Unlike confirmatory sampling that consisted of multi-increment sampling for the entire excavation area, field screen samples were collected at discrete locations along the excavation floors and walls. All field samples were collected from the desired depth (0 to 1 foot) and handled with disposal trowels and glass jars (for compositing and homogenizing samples). 3.5.2 Sample Analysis The field screening and sampling methods are listed in Table 3-2 for the COCs encountered as part of the remedial action at LLs 1-4. Table 3-2 Field Screening Methods for COCs COC Field Screening Method Material Specification Inorganics (Aluminum, Antimony, Arsenic, Chromium, Lead and Manganese) TNT and RDX PCBs Notes: COC – Chemical of Concern XRF – X-Ray Fluorescence TNT – Trinitrotoluene RDX – Cyclonite RVAAP – Ravenna Army Ammunition Plant Multi-Source XRF analyzer (SW-846 Method 6200) Field Colorimetric Analysis (RVAAP SOP) Immunoassay Test Kit (SW-846 Method 4020) Innov-X Systems XRF Metals Analyzer TNT/RDX Ensys ® Soil Test Kit from Strategic Diagnostics Inc. PCB Ensys ® Soil Test Kit from Strategic Diagnostics Inc. GC-ECD Hewlard Packard 5890 GC w/ ECD SOP – Standard Operating Procedure PCBs – Polychlorinated Biphenyls GC – Gas Chromatograph ECD – Electron Capture Detector *** FINAL***
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