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SAP Addendum Specific to Field Sampling Plan for AOC-55 Remedial Actions, January 2003
Section 3 - Removal Action Activities
Parsons has been contracted to remove the wastes from the land-based portion of the site. AOC-55 is a disposal burial area that consists of one large trench area and several smaller trench areas of unknown depth.
Exploratory investigation trenches will be excavated to verify the results of the geophysical surveys so that the geophysical results will have verifiable �ground-truth�. The lateral and vertical extents of the geophysical anomalies will be defined by exploratory trenching as well as the approximate volume of material in the landfill. The contents of the trenches will be examined and through testing, confirm as either hazardous or non-hazardous.
It is estimated that the exploratory trenching activities will generate approximately 2,400 yds3 of loose material (2,000 yds3 of in-place soil). If no waste material or debris are observed in the cover soils, one sample will be collected for every 1000 yds3 of material excavated. If waste material or debris is observed, the material will not be used as fill and it will then be characterized for waste disposal.
The COCs at AOC-55 include VOCs, explosives, and metals but selected samples will be tested for SVOCs to confirm that they are not present. An estimated six VOC (EPA Method 8260, full list) and metals (EPA Method 6020 and 6010B, CSSA full list) discrete grab samples and six SVOC (EPA Method 8270, full list) and Mercury (EPA Method 7471A) composite samples will be collected and analyzed. Field duplicate and matrix spike duplicate samples are to be collected and analyzed per AFCEE QAPP 3.0. Full Quality Assurance/Quality Control (QA/QC) will be performed on these samples (100% validation/verification). If soil exceeds CSSA�s background level for metals, TCLP samples may be required.
AOC-55 is a disposal burial area that consists of one large trench portion of unknown depth. A removal action of the contaminated media will be executed as part of the interim corrective measures and environmental investigations. Samples will be collected from the excavated soil stockpile to characterize the concentration of contaminants in the soils and classify the soil as hazardous or nonhazardous for waste disposal purposes.
An estimated 35,000 yds3 of loose material will be generated during the removal action and samples will be collected on a frequency of one sample per 1,000 yds3 of excavated soil. It is therefore estimated that approximately thirty-five samples will be collected. Initial characterization of excavated soils will require VOC (EPA Method 8260, full list) discrete grab samples and SVOC (EPA Method 8270, full list) and total metals (EPA Method 6020 and 6010B, CSSA full list) composite samples to be collected. Waste characterization profiling will require TCLP analysis for COCs determined previously by totals analysis.
Samples will be analyzed using 7-day turnaround times. Field duplicate, matrix spike, and matrix spike duplicate samples will not be required, but trip blanks will be used as necessary. Case narratives will be reviewed for completeness but formal verification/validation will not be required.
If the excavated material meets non-hazardous waste requirements, the soil will be transported off-site for disposal. Upon completion of the soil removal, the excavation will be backfilled, leveled to grade, and a low water crossing will be installed to replace the existing bridge that will be eliminated as part of the removal action. Additional information regarding these removal activities is included in Section 4 of the Environmental Cleanup Plan, Parsons, April 2002.
Confirmation samples will be collected from the soil portion of the excavation sidewalls as the excavation progresses. The confirmation samples will consist of discrete grab samples collected at intervals of one sample for every 100 linear feet of excavation sidewall and will be analyzed for COCs identified during the waste characterization sample analyses. Approximately thirty sidewall confirmation samples will be collected. In addition, one rock sample per 20,000 ft2 of excavated area will be collected from the bottom of the trench for closure of the land-based portion of the site (estimated 8 samples).
The QA/QC samples to be collected and analyzed along with the soil confirmation samples will include; FDs, MS, MSDs, TBs, and equipment rinse blanks samples as necessary as per AFCEE QAPP 3.0. Full Quality Assurance/Quality Control (QA/QC) will be performed on these samples and 100% validation/verification will be required. Further excavation may be conducted if any confirmation samples exceed CSSA�s established background concentrations for metals. If additional samples are necessary, a minimum of two additional confirmation samples will be collected after further excavation is complete.